JPH0842985A - Refrigerant conducting tube for heat exchanger - Google Patents

Abstract

PURPOSE:To improve heat exchanging efficiency and pressure resistant performance by a method wherein the captioned conducting tube is formed of a flat aluminum tube provided with flat upper and lower walls and a multitude of pillars, riding over the upper and lower walls and provided with a predetermined interval between each others, while the spaces between mutual pillars are utilized as refrigerant passages. CONSTITUTION:A refrigerant conducting tube T1 for heat exchanger is provided with flat upper and lower walls 11, 12 and a multitude of pillars 13, riding over the upper and lower walls 11, 12 and provided with a predetermined interval between mutual pillars while the spaces between mutual pillars 13 are utilized as refrigerant passages 14. The pillars 13 are constituted of upward pins 16, formed so as to be integrated with the lower wall 12 and protruded inwardly so as to be connected to the inner surface of the upper wall 11. Further the flat aluminum tube 15 is constituted of two sheets of upper and lower aluminum sheets 17, 18 constituted of brazing sheets having a brazing material layer on both surfaces while rise-up sections 19, formed by bending both side ends of the lower aluminum sheet 18 vertically, are connected to the upper aluminum sheet 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant flow pipe for a heat exchanger, and more particularly to 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, in view of the improvement of heat exchange efficiency and the downsizing of the condenser, it is desirable that the flat refrigerant flow pipe has a thin wall and a height as low as possible. However, in the case of the extruded shape material, there is a limit in reducing the tube height and reducing the wall thickness due to restrictions on the extrusion technology.

Further, 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.

Therefore, in order to solve this problem,
(B) In the flat refrigerant flow pipe made of electric resistance welded pipe, the inside is divided into a plurality of coolant passages, and a plurality of louvered corrugated inner fins for alternating the refrigerant between adjacent passages are inserted into the refrigerant flow pipe. Those brazed (Japanese Patent Laid-Open No. 1-9
(See Japanese Patent No. 8896), and (b) two-folded inward protruding reinforcement portions whose tips are butted against each other are intermittently and parallelly formed in the longitudinal direction on the upper and lower walls of the electric resistance welded flat refrigerant distribution pipe. The above (see Japanese Patent Application Laid-Open No. 57-136093) has been proposed.

[0006]

However, in the flat refrigerant distribution pipe of the above (a), since wavy inner fins must be inserted into the flat pipe, productivity is poor. In addition, in the flat refrigerant flow pipe of the above (b), the inwardly projecting reinforcing portion is formed by a press or a roller, but its transverse cross section is in a V-shaped open state, so the strength is not sufficient. . Therefore, it is conceivable to fold it in a completely closed state by roll forming to form the inward protruding reinforcement portion. However, in this case,
Since ridge grooves are inevitably left on the upper and lower walls of the flat refrigerant flow pipe, when connecting the refrigerant flow pipe to the header in a communicating manner and brazing, the brazing should be conducted along the groove of the brazing ridge. There is a risk of spillage from the part and defective soldering. Further, since the inward protruding reinforcement portion intermittently forms the two-folded portion on the flat plate, there is a possibility that the dimensions thereof may vary and the dimensions of the refrigerant passage may not be constant. Further, in the case of roll forming, since the plate thickness remains the same, it is disadvantageous in terms of material to form the reinforcing portion by folding in two, and it is difficult to form a large number of narrow refrigerant passages. is there.

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

[0008]

A refrigerant flow pipe for a heat exchanger according to the present invention comprises 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. A flat aluminum tube having a refrigerant passage between them is a flat aluminum tube made of an aluminum plate, and a pillar is made of a pin integrally formed in a raised shape from the aluminum plate. It is a thing.

In the flat aluminum tube, the hollow portion is formed by the upper and lower two aluminum plates,
It is formed by bending and joining at least one of the upper and lower sides of both side edges of both aluminum plates, or one aluminum plate has a central portion of width so that a hollow portion is formed. Can be folded with
Further, it is formed by bending and joining at least one of both side edges.

Further, the pillar may be formed by a pin integrally formed in an inwardly protruding shape with respect to one of the upper and lower walls and being joined to the inner surface of the other flat wall. However, the pillar is integrally formed in the shape of an inward protrusion from the upper wall, and the downward pin is formed by being joined to the flat inner surface of the lower wall, and is integrally formed in the shape of an inward protrusion from the lower wall. There are two types, that is, the upwardly directed pin that is formed by being joined to the inner surface of the flat upper wall, and both of them may be alternately arranged in the front-rear direction and the left-right direction. , A downward pin integrally formed in an inwardly protruding shape from the upper wall,
It may be formed by joining with an upward pin which is integrally formed in an inwardly protruding shape from the lower wall.

The aluminum plate is preferably a brazing sheet having a brazing material layer on both sides. 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, the pin pitch is 0.4 to 2.0 mm, and the pin height is 0.3 to
5.0 mm is preferable.

[0012]

The refrigerant flow pipe for a heat exchanger according to the present invention comprises flat upper and lower walls and a large number of columns extending over the upper and lower walls and being spaced apart from each other by a predetermined distance. Since the flat aluminum tube is used, the refrigerant flowing through the refrigerant flow pipe flows in both the length direction and the width direction of the flow pipe and is uniformly mixed.

Further, since the flat aluminum tube is made of an aluminum plate and the pillar is made of a pin integrally formed in a raised shape from the aluminum plate, a refrigerant made of an aluminum extruded profile is used. As compared with the flow pipe, the pipe can be made thinner and the height of the pipe can be reduced, and the number of columns per unit area can be arbitrarily increased, so that the inner surface area can be increased. Also, since the flat aluminum tube is formed of an aluminum plate, a brazing sheet can be used for this aluminum plate.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 This example is shown in FIG. 6, in which the heat exchanger refrigerant flow pipe (T1) has flat upper and lower walls (11) and (12) and upper and lower walls (11) and (12). And a plurality of pillars (13) provided at a predetermined distance from each other and straddling each other, and between the pillars (13) is a flat aluminum pipe (15) that is a refrigerant passage (14), The pillar (13) is formed by joining the upward pin (16) integrally formed in an inwardly protruding shape from the lower wall (12) to the inner surface of the flat upper wall (11). .

The flat aluminum pipe (15) is a lower aluminum plate so that a hollow portion is formed by two upper and lower aluminum plates (17) (18) made of a brazing sheet having a brazing material layer on both sides. Both ends of (18) are bent at right angles to form rising parts (19), and upper aluminum plate (17)
It is formed by being joined to.

For the above-mentioned joining, the rising portion (19) is formed thicker than the other portions, and the stepped portion (20) at the same level as the upper end of the upward pin (16) is formed on the upper portion of the raised portion (19). And a projecting portion (21) having an inclined surface extending upward and outward is provided in the longitudinal direction. Both side edges of the upper aluminum plate (17) are inclined outward and downward, and the both side edges of the flat upper aluminum plate (17) are placed on the left and right step portions (20), and the projecting portion (21) is inside. Then, the inclined surface and the side edge inclined surface of the upper aluminum plate (17) are overlapped and joined.

The refrigerant flow pipe (T1) is manufactured as follows. That is, as shown in FIGS. 2 to 4, a pair of upper and lower rolling rolls (22) having a plurality of bottomed holes (23) in which an upper roll (22) is regularly arranged at equal pitches in the length direction and the circumferential direction. According to (24), one aluminum plate material (18A) consisting of a brazing sheet having a wall thickness thicker than the upper and lower walls (11) and (12) of the refrigerant flow pipe (T1) to be manufactured and having a brazing layer on both sides is provided. Form a flat lower wall (12) by reducing the wall thickness to the specified pipe wall thickness, and
(16) is integrally formed in a protruding shape from the lower wall (12) and forms a thick rising portion (19) having step portions (20) and upward protruding portions (21) with inclined surfaces at both ends, Lower Rolled Aluminum Sheet (18)
Get

Next, as shown in FIG. 5, an upper aluminum plate (17) made of a brazing sheet having both side edges slanted and having a brazing layer on both sides is provided with a step portion of the rising portion (19).
In (20), the upper wall (11) is brazed to the upper wall (11) while the pair of left and right caulking rolls (25) is used to prevent the upper wall (11).

Embodiment 2 The refrigerant flow pipe (T2) for a heat exchanger of this embodiment is shown in FIG. 7, and the pillar (13) is integrated with the upper wall (11) in an inwardly protruding shape. The downward facing pin (26) on the flat bottom wall (1
It is the same as Example 1 except that it is formed by being bonded to the inner surface of 2). Refrigerant flow pipe for the heat exchanger
The manufacturing method of (T2) is as follows.
6) is provided and the lower aluminum plate (28) is not provided with pins, the same as the method of the first embodiment. The pin (26) is formed in the same manner as in the first embodiment.

Embodiment 3 A refrigerant flow pipe (T3) for a heat exchanger of this embodiment is shown in FIG. 8, and both end portions of the lower wall (12) are bent in an arc shape, and The inner downward slanted edge is butted and joined to the outer downward slanted edge of the upper wall (11), except that arc-shaped side walls (29) having the same thickness as the upper and lower walls (11) (12) are formed.
This is the same as in the first embodiment. Refrigerant flow pipe for the heat exchanger (T3)
The manufacturing method of is the rising part on both sides of the lower aluminum plate (30).
(29A) has the same thickness as the other part and its height is higher than the upper end level of the upward pin (26) to form an inclined edge, which is butt-joined to the inclined edge of the upper aluminum plate (17). Other than the above, the method is the same as that of the first embodiment.

Example 4 A refrigerant flow pipe (T4) for a heat exchanger of this example is shown in FIG. 10, and a flat aluminum pipe has one aluminum plate and a hollow portion formed therein. As in Example 1, except that it is formed by bending at the center of the width, further bending both side edges inward in a hairpin shape, and overlapping and joining the horizontal edges. Is. In the figure, (31) indicates the other joined side wall.

The heat exchanger refrigerant flow pipe (T4) is manufactured as follows. That is, as shown in FIG. 9, a pair of upper and lower rolling rolls in which the upper roll (32) has a large number of bottomed holes (23) regularly arranged in the longitudinal direction and the circumferential direction at equal pitches on the right side of the center of the length. (32) Due to (33), the right side from the middle (C) of the width of the aluminum plate material consisting of one brazing sheet having a wall thickness thicker than the wall of the refrigerant flow pipe (T4) to be manufactured is a predetermined pipe wall thickness. In addition to thinning to form a flat part, a large number of pins (26) are integrally formed in a flat shape from the flat part, and rising parts (34) higher than the upper ends of the pins (26) are formed on both side ends thereof. , Rolled aluminum plate (35).

Next, both side edges of the aluminum plate (35) are bent in the direction of the protrusion of the pin (26) and further folded back inward to form a hairpin shape, and the aluminum plate (35) is bent at the center of the width. By joining the horizontal portions of both side edges to form a flat aluminum tube (15),
Each pin (26) of the upper wall (11) is brazed to the flat portion of the lower wall (12) to form a column (13). In the above embodiment, if the upper roll having the bottomed hole (23) on the left side in the middle of the length is used, the upward pin (16) is formed on the lower wall (12).

Embodiment 5 The refrigerant flow pipe (T5) for a heat exchanger of this embodiment is shown in FIG. 12, and the pillar (13) is integrally formed in the shape of an inward protrusion from the upper wall (11). Lower wall with flat downward pins (26) formed on
(12) What is formed by being joined to the inner surface, and the lower wall (12)
There are two types, one that is formed by joining the upward pin (16) that is integrally formed in a more inwardly protruding shape to the inner surface of the flat upper wall (11), and that both are in the front-rear direction and the left-right direction. The same as Example 4 except that they are arranged alternately.

The heat exchanger refrigerant flow pipe (T5) is manufactured as follows. That is, as shown in FIG. 11, the upper roll (36) has a large number of bottomed holes (23) regularly arranged in the longitudinal direction and the circumferential direction at equal pitches on the left and right sides of the center of the length, and the right roll Each bottomed hole (23) has a left bottomed hole (2
3) A pair of upper and lower rolling rolls (36) and (33) that are offset in the one-half direction from 1) are used to produce a single aluminum plate material that is thicker than the wall of the refrigerant flow pipe (T5) to be manufactured. A flat portion is formed by thinning the wall thickness to a predetermined pipe wall thickness, and a large number of pins (16) and (26) are shifted by 1/2 pitch in the left half and the right half of the width so that the flat portion is integrally raised. Formed, to obtain a rolled aluminum plate (37), the aluminum plate (37) is bent at the center of the width, each pin (26) of the upper wall (11) to the flat portion of the lower wall (12), the lower wall ( A refrigerant flow pipe (T5) for a heat exchanger was formed in the same manner as in Example 4 except that each pin (16) of 12) was brazed alternately to the flat portion of the upper wall (11) to form a column (13). obtain.

Example 6 The refrigerant flow pipe (T6) for the heat exchanger of this example is shown in FIG. 14, and the flat aluminum pipe (15) is
One aluminum plate whose both edges are slanted is bent at the center of the width so that a hollow part is formed, and the two side edges are bent to obtain arcuate side walls (38). The pillars (13) are formed by being joined to each other, and the pillars (13) are formed inward from the upper wall (11) so as to be integrally formed with the downward pins (39) and downwardly from the lower wall (12). It is the same as the fourth embodiment except that it is formed by being joined to the upward pin (40) integrally formed.

The heat exchanger refrigerant flow pipe (T6) is manufactured as follows. That is, as shown in FIG. 13, a pair of upper and lower rolled rolls (42) having a large number of bottomed holes (41) regularly arranged in the longitudinal direction and the circumferential direction at equal pitches on the left and right sides from the center of the length. By the rolls (42) (33),
Thicker wall than the wall of the refrigerant flow pipe (T6) to be manufactured 1
A flat plate is formed by thinning the aluminum plate material to a predetermined wall thickness, and a number of pins (39, 40) are raised from the flat part so that the left half and the right half of the width are symmetrical. To form a rolled aluminum plate (43), bend the aluminum plate (43) at the center of the width, and join both side edges to form a flat aluminum tube (15) and downward. A refrigerant flow pipe (T6) for a heat exchanger is obtained in the same manner as in Example 4 except that the pin (39) and the upward pin (40) are joined to form the column (13).

Finally, an aluminum plate material having a wall thickness thicker than the wall of the refrigerant flow pipe to be manufactured is thinned to a predetermined pipe wall thickness to form a flat portion, and a large number of pins forming a large number of pillars are flattened. A method other than the above method of integrally forming a ridge shape from the portion will be illustrated.

FIGS. 15 to 17 show an example of the above.
This is because the aluminum plate material (44A) is cut and removed by a rotating disk-shaped cutting tool (45) up to a predetermined pipe wall thickness except for the part where a large number of pins are formed, and the diamond-shaped taper pin (46) It is intended to obtain an aluminum plate (44) having a predetermined thickness and having lattice-shaped troughs (47).

18 to 19 show another example, in which an aluminum plate material (48A) is overlaid with a perforated plate (49) which is more rigid and thicker than a predetermined pin height, and a pair of rolled plates are rolled. Pass between the rolls (50) and (51), and after passing, perforated plate (49)
By removing from the rolled aluminum plate (48), the through hole (52) of the perforated plate (49) allows the pin corresponding to the shape to be formed.
You get (53).

20 to 22 show still another example, which is a mold (55) having a large number of downward-bottomed holes (54).
By sequentially pressing the aluminum plate material (56A) from one end to the other, and the pin with the bottomed hole (54)
(57) Formed aluminum plate with a certain thickness (56)
Is what you get.

[0032]

According to the refrigerant flow pipe for a heat exchanger of the present invention, the refrigerants flowing through the parallel refrigerant passages are mixed by flowing between the columns in both the length direction and the width direction of the flow pipe. Therefore, the refrigerant is similarly condensed on the windward side and the leeward side so that the refrigerant flows uniformly and the heat exchange efficiency is improved.

Further, since the flat aluminum pipe is made of an aluminum plate and the pillar is made of a pin integrally formed in a raised shape from the aluminum plate, the electric resistance welded pipe and the inner fin with louver are connected to each other. The productivity is significantly better than the combined refrigerant flow tubes, and the tube wall can be made thinner and the tube height can be made lower than that of the aluminum extruded profile refrigerant flow tubes. Performance and weight reduction can be achieved.

Furthermore, since a brazing sheet can be used for the aluminum plate which is the material of the flat aluminum tube, when assembling the heat exchanger, the brazing is performed on the corrugated fins with louvers interposed between the adjacent refrigerant flow tubes. Eliminates the need for sheets. In other words, the brazing sheet has a higher hardness in the brazing layer than in the core layer, so the corrugated
The use of a brazing sheet for the fin has a problem in that the cutter is worn during its production, but this problem can be overcome.

[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 in which a rolled aluminum plate for a refrigerant distribution pipe of Example 1 of the present invention is manufactured.

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 the refrigerant flow pipe of the first embodiment.

FIG. 7 is a transverse cross-sectional view showing a refrigerant flow pipe of Embodiment 2 of the present invention.

FIG. 8 is a transverse sectional view of a refrigerant flow pipe according to a third embodiment of the present invention.

FIG. 9 is a transverse cross-sectional view showing a state in which a rolled aluminum plate for a refrigerant flow pipe of Example 3 is manufactured.

FIG. 10 is a transverse cross-sectional view of a refrigerant flow pipe of Embodiment 4 of the present invention.

FIG. 11 is a transverse cross-sectional view showing a state in which a rolled aluminum plate for a refrigerant distribution pipe of Example 4 is manufactured.

FIG. 12 is a transverse sectional view of a flattened refrigerant flow pipe according to a fifth embodiment of the present invention.

FIG. 13 is a transverse cross-sectional view showing a state in which a rolled aluminum plate for a refrigerant flow pipe of Example 5 is manufactured.

FIG. 14 is a transverse cross-sectional view of a refrigerant flow pipe of Embodiment 6 of the present invention.

FIG. 15 is a partial perspective view showing a state in which the aluminum plate material is in the process of being formed, showing an example of forming an aluminum plate of a predetermined thickness having a raised pin from the aluminum plate material by cutting.

FIG. 16 is a partial cross-sectional view of an aluminum plate having a predetermined thickness and having a ridged pin formed by cutting.

FIG. 17 is a partial plan view of an aluminum plate having a predetermined thickness, which is formed by cutting and has a raised pin.

FIG. 18 is a partial transverse cross-sectional view showing a state just before rolling, showing an example of forming an aluminum plate having a predetermined thickness from an aluminum plate material by using a perforated plate and rolling the porous plate.

FIG. 19 is a transverse cross-sectional view showing a state in which a pin is formed by a perforated plate and is in the process of rolling.

FIG. 20 is a partial transverse cross-sectional view showing an example of forming an aluminum plate having a predetermined pin having a raised pin from an aluminum plate material by a press and showing a state before the die is lowered during the formation.

FIG. 21 is a transverse cross-sectional view showing a state after the mold is lowered.

FIG. 22 is a cross-sectional view showing a state after the mold has been raised.

[Explanation of symbols]

(11): Upper wall (12): Lower wall (14): Refrigerant passage (15): Flat aluminum tube (16) (26) (39) (40): Pin (17) (18) (27) ( 28) (30) (35) (37) (43) (44) (48) (56): Aluminum plate (T1) (T2) (T3) (T4) (T5) (T6): Refrigerant flow pipe

Claims (6)

[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 predetermined intervals, the flat aluminum tubes having a refrigerant passage between the columns. A heat exchanger refrigerant circulation tube comprising a flat aluminum tube formed of an aluminum plate, and a column having a pin integrally formed in a raised shape from the aluminum plate. 2. The flat aluminum tube is formed by bending and joining at least one of the upper and lower sides of both side edges of both aluminum plates so that a hollow portion is formed by the upper and lower two aluminum plates. The refrigerant flow pipe for a heat exchanger according to claim 1, which is formed by: 3. The flat aluminum tube is formed by bending one aluminum plate at the center of the width so that a hollow portion is formed, and further by bending at least one of both side edges to join them. The refrigerant flow pipe for a heat exchanger according to claim 1, which is formed by the above. 4. The pillar is formed by connecting a pin, which is integrally formed as an inward protrusion from one of the upper and lower walls, to the inner surface of the other flat wall. The refrigerant flow pipe for a heat exchanger according to claim 1. 5. The pillar is formed by connecting a downward pin integrally formed in an inwardly projecting shape from the upper wall to a flat inner surface of the lower wall, and is formed inwardly projecting from the lower wall. 2. There are two types, one is an integrally formed upward pin and the other is formed by being joined to a flat inner surface of an upper wall, and both are arranged alternately in the front-rear direction and the left-right direction. Refrigerant flow pipe for heat exchanger. 6. The pillar is formed by joining a downward pin integrally formed in an inward protruding shape from the upper wall and an upward pin integrally formed in an inward protruding shape from the lower wall. The refrigerant flow pipe for a heat exchanger according to claim 1, which is one.