JPH08174116A - Production of coolant flow tube for heat exchanger - Google Patents

Abstract

PURPOSE: To obtain a coolant flow tube for a heat exchanger with the excellent heat exchanging efficiency, pressure durability and strength. CONSTITUTION: This is a producing method of a heat exchanger coolant flow tube T1 provided with flat upper and lower walls 11, 12 and many numbers of columns 13 being laid across the upper and lower walls 11, 12 and installed mutually in a prescribed interval, and being composed of a flat shape aluminum tube 15 of the space between the mutual columns 13 being made as a coolant flow path 14. One sheet of aluminum plate blank 18A whose wall thickness is thicker than the wall of the coolant flow tube T1 to be planned to be produced is made thinner to a prescribed thickness, formed to a flat lower wall 12, many numbers of pins 16 are formed from the wall 12 into one body in an upheaving state, the other one sheet of flat aluminum plate 17 is mounted so as to be laid over the total pins 16, made as the upper wall 11, further the lower aluminum plate 18 is bent so as to form a tube side wal and both side peripheral parts are joined mutually. In such a way, the flat shape aluminum tube 15 is formed, and each pin 16 of the lower wall 12 is joined to the upper wall 11 and the column 13 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a refrigerant flow pipe for a heat exchanger, and more particularly to a method for manufacturing a refrigerant flow pipe for a condenser used in a car cooler. In this specification, "aluminum" includes both pure aluminum and aluminum alloy.

[0002]

2. Description of the Related Art Recently, as a condenser for car cooler,
As shown in FIG. 1, a pair of headers (1) and (2) are arranged in parallel to each other at a distance from each other and a pair of headers (1) and (2) connected in parallel to each other. Both the refrigerant flow pipes (3) are arranged in the ventilation gap between the flat refrigerant flow pipe (3) and the adjacent refrigerant flow pipes (3).
Corrugated fins (4) brazed together with the inlet pipe (5) horizontally connected to the upper end of the right header (2)
And an outlet pipe (6) horizontally connected to the lower end portion of the left header (1), and first to fourth second pipes provided alternately in the right header (2) and the left header (1). Partition plates (7) to (10)
And the number of refrigerant distribution pipes (3) between the inlet pipe (5) and the first partition plate (7), and the refrigerant distribution pipe between the second partition plate (8) and the third partition plate (9). Number of (3), number of refrigerant distribution pipes (3) between third partition plate (9) and fourth partition plate (10), refrigerant distribution pipe between fourth partition plate (10) and outlet pipe (6) The number of (3) is gradually decreased from the top, and the vapor-phase refrigerant flowing in from the inlet pipe (5) flows in a meandering shape in the condenser before it flows out from the outlet pipe (6) into a liquid phase. So-called parallel flow type or multi-flow type capacitors have been widely used as substitutes for conventional serpentine type capacitors as those capable of achieving high performance, low pressure loss and ultra compactness. There is.

Since the high-pressure gas refrigerant is introduced into the flat refrigerant flow pipe used for the above condenser,
Pressure resistance is required. In order to meet this requirement and improve heat exchange efficiency, the refrigerant flow pipe shall be made of an aluminum hollow extruded profile with flat upper and lower walls and a reinforcing wall extending over the upper and lower walls and extending in the longitudinal direction. It was being done. By the way, when the reinforcing wall is provided in the refrigerant flow pipe, independent parallel refrigerant passages are formed inside the reinforcing wall. Since the air flows so as to be orthogonal to the parallel refrigerant passages, the heat exchange property is necessarily better on the inlet side than the outlet side of the air. Therefore, in the refrigerant passage on the windward side, the gaseous refrigerant is rapidly condensed and the condensed liquid is accumulated, while the gaseous refrigerant remains in the refrigerant passage on the leeward side. Flow is uneven and heat exchange efficiency is not good.

In order to solve this problem, therefore, a double-folded inward projecting reinforcing portion whose tips are butted against each other is intermittently and parallelly arranged in the longitudinal direction on the upper and lower walls of the electric resistance welded flat refrigerant flow pipe. Forming method (JP-A-57-136093)
(See Japanese Patent Publication).

[0005]

However, in the above-described method for manufacturing a flat refrigerant distribution pipe, the inwardly protruding reinforcing portion is formed by a press or a roller, but its cross section is opened in a V shape. Therefore, the strength is not sufficient.

An object of the present invention is to provide a method for manufacturing a refrigerant flow pipe for a heat exchanger, which has good heat exchange efficiency, sufficient pressure resistance, and high strength.

[0007]

According to a first aspect of the present invention, there is provided a flat upper and lower wall and a large number of columns extending over the upper and lower walls and spaced from each other by a predetermined distance, and the columns are provided with a refrigerant. A method of manufacturing a refrigerant flow pipe for a heat exchanger, which comprises a flat aluminum pipe formed as a passage, wherein a single aluminum plate material thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness. To form one of the flat upper and lower walls, and form a large number of pins integrally from the same wall in a ridged manner, so that another flat aluminum plate spans all the pins. And the other wall is bent and at least one of both aluminum plates is bent so as to form a pipe side wall and the side edges of both are joined to form a flat aluminum pipe, and It is characterized in that to form the column by joining pins wall to the other wall.

According to a second aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the first aspect of the present invention, an aluminum plate material having a wall thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness. Between the pair of rolling rolls, each of which has a large number of bottomed holes on its peripheral surface when forming a large number of pins that will become a large number of pillars integrally from the flat part to form a flat portion It is characterized by allowing aluminum plate material to pass through.

According to a third aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the first aspect of the present invention, an aluminum plate material having a wall thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness. To form a flat part and to form a large number of pins, which will become a large number of pillars, integrally with the flat part in a raised shape, use a mold having a large number of bottomed holes in either the upper mold or the lower mold. It is characterized by being used and pressed.

According to a fourth aspect of the present invention, there are provided flat upper and lower walls and a large number of pillars that extend over the upper and lower walls and are spaced apart from each other by a predetermined distance.
A method for manufacturing a refrigerant flow pipe for a heat exchanger, which comprises a flat aluminum pipe in which one of the upper and lower walls is an inner / outer double wall, wherein an aluminum plate material thicker than a wall thickness to be an inner wall is specified. To form a flat board by thinning the board to the thickness of the board.In addition, a large number of pins are integrally formed in a protruding shape from the board, the board with pins is inserted into a flat aluminum tube, and the board is bonded to one wall A double wall is formed, and each pin is joined to the other wall to form a pillar.

According to a fifth aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the fourth aspect, an aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate. In forming and forming a large number of pins that will become a large number of pillars integrally from the substrate in a protruding shape, one roll passes the aluminum plate material between a pair of rolling rolls that have a large number of bottomed holes on the peripheral surface. It is characterized by being busy.

According to a sixth aspect of the present invention, in the method of manufacturing a refrigerant flow pipe for a heat exchanger according to the fourth aspect of the invention, an aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate. Forming and forming a large number of pins that will become a large number of pillars integrally from the substrate in a raised shape, pressing using a molding die that has a large number of bottomed holes in either the upper mold or the lower mold. It is characterized by.

According to a seventh aspect of the present invention, the flat upper wall, the intermediate wall and the lower wall, the intermediate wall and the upper wall, and the intermediate wall and the lower wall are provided at a predetermined interval. A method of manufacturing a refrigerant flow pipe for a heat exchanger, comprising a plurality of pillars, and a flat aluminum tube in which a refrigerant passage is formed between the pillars, and an aluminum plate material thicker than a wall thickness to be an intermediate wall is used. A flat board is formed by thinning the board to a specified thickness, and a large number of pins are integrally formed in a raised shape from both sides of the board.The board with pins is inserted into a flat aluminum tube, and both side edges of the board are attached to the side wall of the tube. While joining to form an intermediate wall, each pin on the upper surface side of the intermediate wall is on the upper wall,
Each of the pins on the lower surface side of the intermediate wall is joined to the lower wall to form a column.

According to an eighth aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the seventh aspect, an aluminum plate material thicker than a wall thickness to be an intermediate wall is thinned to a predetermined thickness to form a flat substrate. In addition to forming a large number of pillars that form multiple pillars from both sides of the substrate in a protruding manner, pass the aluminum plate material between a pair of rolling rolls that have a large number of bottomed holes on the peripheral surface. It is characterized by that.

The aluminum plate preferably comprises a brazing sheet having a brazing material layer on both sides. Further, the pillars may be arranged vertically and horizontally at equal intervals, or may be arranged in a staggered manner. The pin may have any shape such as a circular cross section, a diamond shape, a triangle, a quadrangle, and an oval as long as it is within the circumscribed circle.
The diameter of the pin (the diameter of the circumscribing circle when the pin is not circular in cross section) is 0.2 to 2.0 mm, and the pin pitch is 0.35.
5.0 mm is preferable. The pin length is 0.2 to 2.0 mm for one side and 0.1 to 1 mm for both sides.
0 mm is preferable.

[0016]

According to the first aspect of the present invention, there is provided a method for manufacturing a refrigerant flow pipe for a heat exchanger, wherein a single aluminum plate material having a thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness and flattened. While forming either one of the upper and lower walls, a large number of pins are integrally formed in the shape of a ridge from the same wall, and the other flat aluminum plate is placed over all the pins and the other is placed. A flat aluminum tube is formed by bending at least one of both aluminum plates so as to form a tube side wall and joining the side edges of both sides without forming a wall, and each pin of one wall is Since it is to be joined to the other wall to form a pillar,
It consists of flat aluminum pipes with good productivity and flat upper and lower walls, and a large number of columns extending over the upper and lower walls and spaced from each other at predetermined intervals, with the refrigerant passages between the columns. It is possible to obtain a refrigerant flow pipe for a heat exchanger in which the refrigerant flows in both the length direction and the width direction of the flow pipe and is evenly mixed, and is thinner than the case where the refrigerant flow pipe is manufactured with an aluminum extruded profile. In addition, the tube height can be reduced, and the number of columns per unit area can be arbitrarily increased, so that the inner surface area can be increased.

According to a second aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the first aspect of the present invention, an aluminum plate material having a wall thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness. Between the pair of rolling rolls, each of which has a large number of bottomed holes on its peripheral surface when forming a large number of pins that will become a large number of pillars integrally from the flat part to form a flat portion In order to allow the aluminum plate material to pass through, a predetermined position on the inner surface of one of the upper and lower walls of the refrigerant flow pipe for the heat exchanger,
A large number of pins can be obtained easily and efficiently.

According to a third aspect of the present invention, in the method of manufacturing a refrigerant flow pipe for a heat exchanger according to the first aspect of the present invention, an aluminum plate material having a wall thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness. To form a flat part and to form a large number of pins, which will become a large number of pillars, integrally with the flat part in a raised shape, use a mold having a large number of bottomed holes in either the upper mold or the lower mold. Since it is used for pressing, a large number of pins can be easily and efficiently obtained at a predetermined position on the inner surface of one of the upper and lower walls of the refrigerant flow pipe for the heat exchanger, as in the invention of claim 2. it can.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a refrigerant flow pipe for a heat exchanger, wherein an aluminum plate material thicker than an inner wall thickness is thinned to a predetermined thickness to form a flat substrate and a large number of pins. Is integrally formed in a bulge shape from the substrate, the substrate with pins is inserted into the flat aluminum tube, the substrate is joined to one wall to form an inner / outer double wall, and each pin is joined to the other wall. Since it forms the pillars, it is provided with flat upper and lower walls, and a large number of pillars that extend over the upper and lower walls and are spaced apart from each other by a predetermined distance. A refrigerant flow pipe for a heat exchanger is obtained, which is made of a flat aluminum pipe in which one of the walls is a double wall inside and outside, and the refrigerant flows in both the length direction and the width direction of the flow pipe and is uniformly mixed. be able to In comparison with manufacturing a refrigerant flow pipe with an aluminum extruded shape, it is thinner and the height of the pipe can be made lower, and the number of columns per unit area can be arbitrarily increased, so the internal surface area can be increased. can do.

According to a fifth aspect of the present invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the fourth aspect, an aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate. In forming and forming a large number of pins that will become a large number of pillars integrally from the substrate in a protruding shape, one roll passes the aluminum plate material between a pair of rolling rolls that have a large number of bottomed holes on the peripheral surface. Therefore, it is possible to easily and efficiently obtain a large number of pins at a predetermined position on the inner surface of one of the upper and lower walls of the refrigerant flow pipe for the heat exchanger.

According to a sixth aspect of the invention, in the method for manufacturing a refrigerant flow pipe for a heat exchanger according to the fourth aspect of the invention, an aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate. Forming and forming a large number of pins that will become a large number of pillars integrally from the substrate in a protruding shape, using a molding die that has a large number of bottomed holes in either the upper die or the lower die Therefore, similar to the fifth aspect of the invention, a large number of pins can be easily and efficiently obtained at a predetermined position on the inner surface of one of the upper and lower walls of the heat exchanger refrigerant flow pipe.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a refrigerant flow pipe for a heat exchanger, wherein an aluminum plate material thicker than a wall thickness to be an intermediate wall between an upper wall and a lower wall is thinned to a predetermined thickness and flattened. In addition to forming a simple board, a large number of pins are integrally formed in a raised shape from both sides of the board, the board with pins is inserted into a flat aluminum tube, and both side edges of the board are joined to the tube side wall to form an intermediate wall. , The pins on the upper surface side of the intermediate wall are joined to the upper wall, and the pins on the lower surface side of the intermediate wall are joined to the lower wall to form columns, so that a flat upper wall, intermediate wall and lower wall are formed. A flat aluminum in which the intermediate wall and the upper wall are provided with a large number of columns which respectively extend over the intermediate wall and the lower wall and are provided at a predetermined interval from each other, and between the columns are refrigerant passages. It consists of a pipe, and the refrigerant is It is possible to obtain a refrigerant flow pipe for a heat exchanger that flows in both width directions and is uniformly mixed, and it is possible to arbitrarily increase the number of columns per unit area up and down, and in combination with the presence of an intermediate wall. Therefore, the inner surface area can be made very large.

In the method for manufacturing a refrigerant flow pipe for a heat exchanger according to claims 1, 4, and 7, since the flat aluminum pipe is formed of an aluminum plate, a brazing sheet may be used for this aluminum plate. it can.

According to an eighth aspect of the present invention, in the method of manufacturing a refrigerant flow pipe for a heat exchanger according to the seventh aspect, an aluminum plate material thicker than a wall thickness to be an intermediate wall is thinned to a predetermined thickness to form a flat substrate. In addition to forming a large number of pillars that form multiple pillars from both sides of the substrate in a protruding manner, pass the aluminum plate material between a pair of rolling rolls that have a large number of bottomed holes on the peripheral surface. From a predetermined position on both sides of the intermediate wall of the refrigerant flow pipe for the heat exchanger,
A large number of pins can be obtained easily and efficiently.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 This example illustrates the flat upper and lower walls (11) (1) shown in FIG.
2) and a large number of pillars (13) that extend over the upper and lower walls (11) and (12) and are spaced apart from each other by a predetermined distance, and a refrigerant passage (14) is formed between the pillars (13). This is a method for producing a refrigerant flow pipe (T1) for a heat exchanger, which is formed of a flat aluminum pipe (15).

That is, the refrigerant flow pipe (T1) is manufactured as follows. As shown in FIGS. 2 to 4, the upper roll (22) has a pair of upper and lower rolling rolls (22) (24) having a large number of bottomed holes (23) which are regularly arranged at equal pitches in the length direction and the circumferential direction. ), A single aluminum plate material (18A) made of a brazing sheet having a thicker wall thickness than the lower wall (12) of the refrigerant flow pipe (T1) to be manufactured and having a brazing material layer on both sides is provided on a predetermined pipe wall. Thin to thickness to form a flat lower wall (12) and a number of upward facing pins (16)
Are integrally formed in a raised shape from the lower wall (12), and have stepped portions (20) at the same level as the upper ends of the upward pins (16) and upward protruding portions (21) with an inclined surface facing upward and outward at both ends. Thick riser
(19) is formed to obtain a rolled aluminum plate (18).

Next, as shown in FIG. 5, a flat upper aluminum plate (17) made of a brazing sheet having both side edges inclined outward and downward and having a brazing material layer on both surfaces thereof is replaced with a lower aluminum plate (18). Place it on the step (20) of the rising part (19) and prevent it from being caulked by the pair of left and right caulking rolls (25).
Overlap both side edge inclined surfaces of (18) to form the upper wall (11),
The upper end of each upward pin (16) is brazed to the lower surface of the upper wall (11).

Example 2 This example is a method for manufacturing the refrigerant flow pipe (T2) for a heat exchanger shown in FIG. 7, which comprises a lower aluminum plate (18).
The upper end of the rising part (26) of the upper aluminum plate (17) is made the same as the upper end of the pin (16), and both side edges of the upper aluminum plate (17) are placed on the compatible rising part (26) of the lower aluminum plate (18) for brazing. Upper aluminum plate (17) for easy and secure positioning
A refrigerant flow pipe (T2) for a heat exchanger was obtained in the same manner as in Example 1 except that the downwardly inclined ridges (27) that engage with the inner surfaces of the compatible ascending parts (26) were formed on the inner surface of . Note that the ridge
An extruded profile was used for the upper aluminum plate (11) having (27).

Embodiment 3 This embodiment is a method for manufacturing the refrigerant flow pipe (T3) for a heat exchanger shown in FIG. 8, which has flat upper and lower walls (11) (12).
And a large number of pillars (13) that are provided at predetermined intervals and that extend over the upper and lower walls (11) and (12), and the refrigerant passages (14) are formed between the pillars (13). Obtaining the refrigerant flow pipe for the heat exchanger made of the flat aluminum pipe (15) is the same as in Examples 1 and 2, but the manufacturing method is different from them as follows.

That is, as shown in FIG. 11 and FIG. 12, a large number of pins for molding having a length and width equal to the length and width of the upper aluminum plate (28) with pins to be obtained and arranged vertically and horizontally on the bottom surface are provided. A lower mold (31) having a rectangular recess (29) provided with a bottom hole (30), and an upper mold (32) having a rectangular protrusion (32) fitted in the recess (29). ) And a molding die (3
Using (4), the upper wall (11) of the refrigerant flow pipe (T3) to be manufactured
Press the brazing sheet aluminum plate material having a thicker wall and brazing material layers on both sides to form a flat upper wall (11) by thinning it to a predetermined thickness, and also to attach a large number of downward pins (35). The upper wall (11) is integrally formed in a raised shape to obtain an upper aluminum plate (28), and the upper aluminum plate (28) is taken out from the lower mold (31) by an unshown eclecter.

Next, the rising portions (36) are provided at both ends of the lower wall (12).
Place the upper aluminum plate (28) on the lower aluminum plate (39) made of brazing sheet having a brazing material layer on both sides, and braze the lower end of each downward pin (31) to the upper surface of the lower wall (12). The both end surfaces of the upper wall (11) are brazed to the inner surface of the rising portion (36). The lower aluminum plate (37) having the rising portion (36) is made of extruded shape, and the inner surface height of the rising portion (36) is calculated by adding the lengths of the upper wall (11) and the downward pin (35). Is equal to

Embodiment 4 This embodiment is a method for manufacturing the refrigerant flow pipe (T4) for the heat exchanger shown in FIG. 9, which has flat upper and lower walls (11) (12).
And a large number of pillars (13) that are provided at predetermined intervals and that extend over the upper and lower walls (11) and (12), and the refrigerant passages (14) are formed between the pillars (13). Obtaining the refrigerant flow pipe for the heat exchanger made of the flat aluminum pipe (15) is the same as in Examples 1 to 3, but the manufacturing method is different from these.

That is, as shown in FIGS. 13 and 14, a large number of tapered bottomed holes (39) having a width equal to the width of the upper aluminum plate (28) with a pin to be obtained and arranged vertically and horizontally at the center of the bottom surface. Lower mold (40) with a groove (38)
And a progressive feeding mold (41) consisting of an upper mold (42) fitted in the groove (38) and provided with a rectangular convex portion (41) at a location corresponding to the molding zone (M), A brazing sheet aluminum plate material (28 having a thicker wall than the upper wall (11) of the refrigerant flow pipe (T4) to be manufactured and having a brazing material layer on both sides (28
A) is pressed and fed sequentially to form a flat upper wall (11) by reducing the wall thickness to a specified pipe wall thickness, and a number of downward pins (35) are integrally formed in a protruding shape from the upper wall (11). Then, the upper aluminum plate (28) is obtained.

Next, the brazing sheet is provided with a rising portion (45) whose end faces are stepped portions (44) by folding both side ends of the lower mold (12) twice closely and having brazing material layers on both sides. Place the upper aluminum plate (28) on the lower aluminum plate (46),
The lower end of each downward pin (35) is brazed to the upper surface of the lower wall (12), and the lower end of both ends of the upper wall (11) is brazed to the step portion (44).

The groove (38) is provided with a step at the front end of the forming zone (M) having the bottomed hole (39), and the front portion (38A) is deeper than the step, forming a downward facing shape. Pin (3
5) is designed so as not to damage the bottom of the groove. This is because when the aluminum plate material (28A) is partially formed with a large number of downward pins (35), these are closed bottom holes (3
In order to escape from 9), lift the aluminum material (28A) with an ejector (not shown) and feed it forward by the length of the forming part of the downward pin (35), then re-groove it for the next press. This is because it is necessary to lower it to the bottom of (38). Here, "front" refers to the forward direction of the aluminum plate material (28A).

Further, among the large number of bottomed holes (39) existing in the molding zone (M), the downward facing pin (35) formed by the bottomed holes (39A) at the peripheral edge is smaller than the others. Since the length becomes short, it is preferable to do the following in order to solve this. That is, it is preferable that the diameter of the bottomed hole (39A) at the peripheral edge is 1.2 to 2 times the diameter of the bottomed hole (39) at a portion other than the peripheral edge (see FIG. 14). Further, the depth of the bottomed hole is preferably deeper than the length of the pin to be molded, and the taper angle is preferably 5 to 15 °. Further, after pin formation, it is preferable to roll or press so that all the pins have the same length.

Example 5 This example shows the flat upper and lower walls (46) as shown in FIG.
(47) and a large number of pillars (48) that are provided at predetermined intervals while straddling the upper and lower walls (46) (47), and the pillars (48)
A refrigerant flow pipe for a heat exchanger, which is composed of a rectangular flat aluminum pipe (50) having a refrigerant passageway (49) between them and a lower wall (47) serving as inner and outer double walls (47a) (47b). T5), which is a method similar to the press-molding of the pinned aluminum plate in Example 4, wherein an aluminum plate material thicker than the wall thickness to be the inner wall is thinned to a predetermined thickness to form a flat substrate. In addition to forming a large number of pins from the board in a ridged shape, insert the board with pins into the flat aluminum tube (50) with the pin side up, and braze the board to one wall. The inner and outer double walls (47a) and (47b) are formed, and the upper ends of the upward pins (51) are brazed to the lower surface of the upper wall (46) to form columns (48).

In order to form a flat substrate by thinning an aluminum plate material thicker than the wall thickness to be the inner wall to a predetermined thickness, and to integrally form a large number of pins, which form a large number of pillars, in a protruding shape from the substrate. , As in Example 1,
One roll may pass the aluminum plate material between a pair of rolling rolls having a large number of bottomed holes on the peripheral surface thereof.

As shown in FIG. 15, the diameter of the base end of each pin (16) (35) (51) in Embodiments 1 to 5 is D, and the diameter of the wall (12) (11) (47a) is If the thickness is t, D / t ≧ 5
In this case, a recess (52) is formed on the surface of the wall (12) (11) (47a) on the side opposite to the pin, so D / t <5 is preferable. Further, the heat exchanger refrigerant flow tubes obtained in Examples 1 to 5 may be used upside down.

Example 6 This example illustrates the flat top wall (5) shown in FIG.
3), the intermediate wall (54) and the lower wall (55), the intermediate wall (54) and the upper wall (5
3) and a large number of pillars (56) which are respectively provided on the intermediate wall (54) and the lower wall (55) and are spaced apart from each other by a predetermined distance.
(57), and to produce a heat exchanger refrigerant flow pipe (T6) consisting of a rectangular flat aluminum pipe (60) having a refrigerant passage (58) (59) between the pillars (56). Is the way.

That is, the refrigerant flow pipe (T6) is manufactured as follows. As shown in FIG. 17, a pair of upper and lower rolling rolls (63) (64) having a large number of bottomed holes (61) (62) arranged regularly at equal intervals in the length direction and the circumferential direction.
The intermediate wall (54) of the refrigerant flow pipe (T6) to be manufactured by
The aluminum plate material (67A) made of brazing sheet, which is thicker than the wall thickness of and has a brazing material layer on both sides, is thinned to a predetermined thickness to form a flat substrate (67), and a large number of pins (65) are formed on both sides. (66) is integrally formed in a protruding shape from the substrate (67).

Then, the substrate with pins (67) is inserted into the flat aluminum pipe (60), and both side edges of the substrate (67) are attached to the pipe side walls (6).
While brazing to 8) to form the intermediate wall (54), the intermediate wall (54)
The pins (65) on the upper surface of the column are brazed to the upper wall (53), and the pins (66) on the lower surface of the intermediate wall (54) are brazed to the lower wall (55).
Form (57).

[0043]

According to the method of the present invention, it is possible to obtain a refrigerant flow pipe for a heat exchanger which has good heat exchange efficiency, sufficient pressure resistance, and high strength.

[Brief description of drawings]

FIG. 1 is a plan view of a condenser in which a refrigerant flow pipe is used.

FIG. 2 is a partially cutaway front view showing a state of manufacturing a rolled aluminum plate for a refrigerant distribution pipe in Example 1 of the present invention.

FIG. 3 is a vertical cross-sectional view showing a state immediately before the aluminum plate material is passed through a pair of rolling rolls in the first embodiment.

FIG. 4 is a vertical cross-sectional view showing a state in which the aluminum plate material is being passed through a pair of rolling rolls in the first embodiment.

FIG. 5 is a perspective view showing a state in which the refrigerant flow pipe of Example 1 is being manufactured.

FIG. 6 is a cross-sectional view showing a refrigerant flow pipe obtained by the method of the first embodiment.

FIG. 7 is a cross-sectional view showing a refrigerant flow pipe obtained by the method of Example 2 of the present invention.

FIG. 8 is a cross-sectional view of a refrigerant flow pipe obtained by the method of Example 3 of the present invention.

FIG. 9 is a cross-sectional view of a refrigerant flow pipe obtained by the method of Example 4 of the present invention.

FIG. 10 is a cross-sectional view of a refrigerant flow pipe obtained by the method of Example 5 of the present invention.

FIG. 11 is a transverse cross-sectional view of a mold for forming an aluminum plate with a pin in Example 3.

FIG. 12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a perspective view of a progressive feed die of an aluminum plate with a pin in Example 4.

14 is an enlarged plan view of an essential part of a lower mold in the molding die shown in FIG.

FIG. 15 is a partially enlarged vertical cross-sectional view of the pin-equipped wall showing a state in which a recess is formed on the surface opposite to the surface on which the pin is present.

FIG. 16 is a cross-sectional view showing a refrigerant flow pipe obtained by the method of Example 6 described above.

FIG. 17 is a vertical sectional view showing a state in which the aluminum plate material is being passed through a pair of rolling rolls in the sixth embodiment.

[Explanation of symbols]

 (11) (46) (53): Upper wall (12) (47) (55): Lower wall (13) (48) (56) (57): Pillar (54): Middle wall (14) (49) (58) (59): Refrigerant passage (15) (50) (60): Flat aluminum tube (16) (35) (48) (65) (66): Pin (17) (28): Aluminum plate ( 18A) (28A) (67A): Aluminum plate material (22) (24) (63) (64): Roll (30) (39): Bottom hole (31) (40): Lower mold (33) (42) ): Upper mold (34) (43): Mold (47a): Inner wall (47b): Outer wall (67): Substrate (68): Pipe side wall (T1) (T2) (T3) (T4) (T5) (T6): Refrigerant distribution pipe

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[Procedure amendment]

[Submission date] December 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

In the method for manufacturing the refrigerant flow pipe for the heat exchanger according to the first, fourth and seventh aspects of the present invention , since the flat aluminum pipe is formed of an aluminum plate,
A brazing sheet can be used for this aluminum plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Hasegawa 6-224, Kaiyamacho, Sakai City Showa Aluminum Co., Ltd.

Claims (8)

[Claims] 1. A flat aluminum tube having flat upper and lower walls and a large number of columns extending over the upper and lower walls and spaced from each other at a predetermined interval, and having a refrigerant passage between the columns. A method of manufacturing a refrigerant flow pipe for a heat exchanger, wherein one of aluminum plate material having a wall thickness thicker than a wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined thickness and the upper and lower walls are flat. Along with forming one wall, a large number of pins are integrally formed in a raised shape from the same wall, and another flat aluminum plate is placed so as to span all the pins to form the other wall and both aluminum plates. By bending at least one of the two so as to form a pipe side wall and joining the side edges of both, a flat aluminum pipe is formed, and each pin of one wall is joined to the other wall. Pillar A method of manufacturing a refrigerant flow pipe for a heat exchanger, comprising: 2. A flat plate is formed by thinning an aluminum plate material having a wall thickness larger than that of a wall of a refrigerant flow pipe to be manufactured to a predetermined thickness, and a large number of pins forming a large number of pillars are raised from the flat part. 2. The refrigerant flow for a heat exchanger according to claim 1, wherein one of the rolls is made to pass through an aluminum plate material between a pair of rolling rolls having a large number of bottomed holes in its peripheral surface when integrally formed into a circular shape. Pipe manufacturing method. 3. A flat plate is formed by thinning an aluminum plate material having a wall thickness larger than that of a wall of a refrigerant flow pipe to be manufactured to a predetermined thickness, and a large number of pins forming a large number of columns are raised from the flat part. 2. The method of manufacturing a refrigerant flow pipe for a heat exchanger according to claim 1, wherein, when integrally forming the refrigerant flow pipe, the upper mold and the lower mold are pressed by using a mold having a large number of bottomed holes. Method. 4. A flat upper and lower wall, and a large number of columns extending over the upper and lower walls and provided at a predetermined interval from each other, and a refrigerant passage is formed between the columns, and one of the upper and lower walls is provided. Is a method for manufacturing a refrigerant flow pipe for a heat exchanger, which is made of a flat aluminum pipe whose inner and outer walls are double walls, and is made flat by thinning an aluminum plate material thicker than a wall thickness to be an inner wall to a predetermined thickness. In addition to forming a simple board, a large number of pins are integrally formed in a protruding shape from the board, the board with pins is inserted into a flat aluminum tube, and the board is joined to one wall to form an inner and outer double wall, A method for manufacturing a refrigerant flow pipe for a heat exchanger, characterized in that each pin is joined to the other wall to form a column. 5. An aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate, and a large number of pins to be a large number of pillars are integrally formed in a protruding shape from the substrate. In this case, one of the rolls passes an aluminum plate material between a pair of rolling rolls having a large number of bottomed holes on the peripheral surface thereof.
A method for producing a refrigerant flow pipe for a heat exchanger according to the description. 6. An aluminum plate material thicker than a wall thickness to be an inner wall is thinned to a predetermined thickness to form a flat substrate, and a large number of pins to be a large number of pillars are integrally formed in a protruding shape from the substrate. 5. The method for producing a refrigerant flow pipe for a heat exchanger according to claim 4, wherein the pressing is performed by using a molding die having a large number of bottomed holes in either the upper die or the lower die. 7. A flat upper wall, an intermediate wall and a lower wall, and a plurality of pillars which are provided on the intermediate wall and the upper wall and which respectively extend over the intermediate wall and the lower wall and are spaced apart from each other by a predetermined distance. A method for manufacturing a refrigerant flow pipe for a heat exchanger, comprising a flat aluminum pipe in which a refrigerant passage is provided between columns, wherein an aluminum plate material thicker than a wall thickness to be an intermediate wall is thinned to a predetermined thickness. To form a flat substrate, a large number of pins are integrally formed in a bulge shape from both sides of the substrate, and the substrate with pins is inserted into a flat aluminum tube,
Both side edges of the substrate are joined to the tube side wall to form an intermediate wall, and each pin on the upper surface side of the intermediate wall is joined to the upper wall and each pin on the lower surface side of the intermediate wall is joined to the lower wall to form a column. A method for manufacturing a refrigerant flow pipe for a heat exchanger, comprising: 8. An aluminum plate material thicker than a wall thickness to be an intermediate wall is thinned to a predetermined thickness to form a flat substrate, and a large number of pins to be a large number of pillars are integrally formed in a raised shape from both sides of the substrate. 8. The method for manufacturing a refrigerant flow pipe for a heat exchanger according to claim 7, wherein the aluminum plate material is passed between a pair of rolling rolls each having a large number of bottomed holes on the peripheral surface in forming the same.