JP3156008B2 - Evaporator manufacturing method - Google Patents

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 an evaporator used for a car air conditioner.

[0002]

2. Description of the Related Art Conventionally, as an evaporator for a car air conditioner, a plurality of vertically extending refrigerant circulation sections are provided in parallel, and a portion between adjacent refrigerant circulation sections is provided. There is widely known an air circulating portion in which corrugated fins with louvers are arranged in the air circulating portion.

In this evaporator, when the air is cooled, water in the air condenses and adheres to the fins, flows downwind along the surface of the fins, and most of the water flows when the louvers are provided. It falls down through the formed through-hole. However, there is still a problem that a large amount of water attached to the fins may be scattered on the wind.

Therefore, as a result of various studies by the present inventors, it has been found that one of the causes of the above problems is as follows. That is, as shown in FIGS. 5 and 6, the corrugated fins with louvers form a louver (81) by passing a thin metal plate (50) between a pair of rotating gear-shaped cutters (60) and (70). At the same time, it is bent in a meandering shape, pressed and shrunk in the front-rear direction to determine the distance between the flat portions (80a), and further cut to a predetermined length. The louver (81) includes a plurality of radially extending blades (63) provided in the axial direction on the tooth surfaces (62) and (72) of the teeth (61) and (71) of the cutters (60) and (70). (73). This method is a widely known technique (for example, see Japanese Patent Publication No. 22217/1972).
Detailed description is omitted. In the louvered corrugated fin (80) manufactured by this method, the metal sheet (50) bent in a meandering shape at the same time as the louver (81) is formed, and the metal sheet (50) is forwardly provided between the cutters (60) and (70). (In the direction indicated by the arrow A in FIGS. 5 and 6), the blades (63) and (73) on the tooth surfaces (62) and (72) facing forward in the advancing direction of the tips of the teeth (61) and (71). ) Formed by the radially outer end of the louver (81).
0a), one end of a portion protruding rearward in the traveling direction is crushed to form a crushed portion (81a). 7 and 8
As shown in the figure, so that this crushed part (81a) is on the upper side,
When the corrugated fin (80) is arranged in the air circulation part (100) between the adjacent refrigerant circulation parts (90), a crushed part (81a) on the upper surface of the flat part (80a) of the fin (80) is formed. (W) adhering to the covered area (the area indicated by X in FIG. 8)
When the wind flows in the direction indicated by the arrow S, it flows over the crushed portion (81a) without falling from the through hole (82) created by forming the louver (81), and flows downwindward as a result. Water reaches the leeward end of the flat part (80a) of the fin (80),
From here, they found that they would be scattered by the wind.

An object of the present invention is to provide a method for manufacturing an evaporator which solves the above-mentioned problems.

[0006]

According to a method of manufacturing an evaporator according to the present invention, a plurality of vertically extending refrigerant circulation sections are provided in parallel, and a portion between adjacent refrigerant circulation sections is formed as an air circulation section. A method of manufacturing an evaporator in which corrugated fins with louvers are arranged in an air flow portion, wherein a louver is formed and a meandering shape is formed by passing a thin metal sheet between a pair of rotating gear-shaped cutters. Let
After cutting this to a predetermined length to form a corrugated fin with a louver, when passing the corrugated fin between a pair of gear-shaped cutters, air is blown so that the front side in the traveling direction is upward. It is characterized in that it is arranged in the distribution section.

[0007] In the above, the refrigerant circulating section is, for example, 2
A flat hollow body formed by joining the peripheral portions of two vertical rectangular metal plates together, or a straight pipe portion adjacent to a meandering flat tube for refrigerant distribution in which the straight pipe portion is arranged so as to face up and down. . In the former case, the corrugated fins with louvers are arranged before brazing by combining metal plates forming a flat hollow body for refrigerant distribution, and brazing the metal plates together with the metal plates. .

[0008]

A louver is formed by passing a thin metal plate between a pair of rotating gear-shaped cutters, and the louver is bent in a meandering shape. This is cut into a predetermined length to form a corrugated fin with a louver. Since the fins are arranged in the air circulation section such that the front side in the traveling direction is upward when passing between the pair of gear-shaped cutters, the louver is formed in the manufactured evaporator. Is located on the lower surface side of the flat portion of the corrugated fin, and the louver rises in a predetermined form on the upper surface side. Therefore, of the water adhering to the upper surface of the flat portion of the corrugated fin, the flow of water to the leeward side in the range where the crushed portion of the louver exists is obstructed by the rising portion of the louver, and along the crushed portion It flows inward in the width direction of the bent portion of the fin, and falls downward from the through hole formed when forming the louver.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the term “aluminum” includes an aluminum alloy in addition to pure aluminum.

FIG. 4 shows the overall structure of an evaporator for a car air conditioner manufactured by the method of the present invention.
Indicates the main part. 1 to 4, a car air conditioner evaporator (1) has a plurality of flat hollow bodies for refrigerant circulation arranged in parallel and connected to each other at an upper end portion so as to communicate with each other.
(2) (Refrigerant distribution part) and side plates spaced apart outside the flat hollow body (2) for refrigerant distribution at both left and right ends
(19), the adjacent flat hollow body for refrigerant distribution
(2) The portion between the flat hollow body (2) on both sides and between the side plate (19) at the left and right ends is an air circulation part (10). A corrugated fin (3) with an aluminum louver is arranged in each air circulation part (10). And the wind is
It flows in the direction shown by the arrow (S) in FIG.

The flat hollow body for refrigerant distribution (2) is formed by joining the peripheral edges of two vertical rectangular aluminum plates (4), and a substantially U-shaped space is formed between the two aluminum plates (4). It has a U-shaped bulging refrigerant passage (5), and an inlet header forming portion (6) and an outlet header forming portion (7) connected to the upper end of the refrigerant passage (5). And all flat hollow bodies
An entrance header (8) and an exit header (9) are formed by the entrance and exit header forming sections (6) and (7) of (2).

The aluminum plate (4) is formed by press-forming an aluminum brazing sheet having both surfaces clad with a brazing material, and has a substantially U-shaped recess (11) for forming a refrigerant passage. , Refrigerant passage forming recess (11)
An inlet header forming recess (12) connected to the upper end of the vertical portion on the leeward side of the outlet, and an outlet header forming recess (13) connected to the upper end of the vertical portion on the leeward side of the refrigerant passage forming recess (11). ). On the bottom surface of the recess (11) for forming the refrigerant passage, the refrigerant passage (5)
A plurality of projections (14) are formed to disturb the flow of the refrigerant inside and improve the heat transfer efficiency. The depth of the header forming recesses (12) and (13) of the aluminum plate (4) on the left and right sides of the refrigerant hollow flat hollow body (2) at the left and right ends is the coolant passage forming recess (11).
And the other aluminum plates (4), that is, the aluminum plates (4) on the left and right sides inside the refrigerant hollow flat bodies (2) at the left and right ends and the aluminum plates (4) of the other flat hollow bodies (2) 2), the depth of the header forming recesses (12) and (13) is greater than the depth of the refrigerant passage forming recess (11). Recesses (12) (13) for forming both headers of the other aluminum plate (4)
The communication holes (15) and (16) are formed at the bottom of each of them. One of the aluminum plates (4) constituting one or more flat hollow bodies (2) arranged at predetermined positions
In, the communication hole may be formed in only one of the header forming recesses (12) and (13).

Flat portion of corrugated fin with louver (3)
(3a) is formed with a plurality of louvers (17),
A through hole (18) is provided for forming the louver (17). Also, when forming the louver (17),
The louver (17) has a crushed portion (17a).
(17a) is located on the lower surface side of the flat portion (3a). The bent portion (3b) of the corrugated fin (3) has a semi-elliptical shape obtained by cutting the ellipse along the long axis. Therefore, corrugated fins
(3) The contact area between the flat hollow body (2) and the flat part (3
The lengths of the louver (17) and the through hole (18) with respect to the entire width of a) are larger than those in the case where the bent portion is semicircular.

A refrigerant inlet pipe (23) is connected to an inlet header forming portion (6) of the leftmost flat refrigerant hollow body (2), and an outlet header forming portion of the rightmost refrigerant flat hollow body (2) (2). 7) is connected to a refrigerant outlet pipe (24).

This evaporator (1) is manufactured as follows. First, in the same manner as in the conventional method shown in FIGS. 5 and 6, an aluminum sheet is passed between a pair of rotating gear-shaped cutters (60) and (70) to form a louver (17) and meander. Bend into a shape, press and shrink it in the front-rear direction to determine the distance between the flat parts, and further cut it to a predetermined length to make the corrugated fin with louver (3)
To manufacture. Next, two aluminum plates (4) are superposed two by two to form a plurality of combined bodies.
Communication holes (15) for recesses (12) (13) for forming inlet and outlet headers
(16) Arrange them so that they match each other.
In addition, the side plate (19) is arranged outside the combined body at the left and right ends. After that, the corrugated fin with louver
(3) when passing between a pair of gear-shaped cutters (60) and (70) such that the front side in the traveling direction is on the upper side, so that the combined bodies between adjacent combined bodies and the left and right ends are It is arranged in the air circulation part (10) between the side plate (19) (see FIG. 3). Then, all aluminum plates (4) are brazed together to form a flat hollow body (2), and the flat hollow body (2), corrugated fins (3), and side plates (1) are formed.
9) and the flat hollow body (2), and the corrugated fin (3) and the side plate (19) are collectively brazed. Thus,
An evaporator (1) is manufactured.

In the evaporator manufactured as described above, the louver (1) in the corrugated fin (3) with louver is used.
The crushed portion (17a) generated when forming (7) is located on the lower surface side of the flat portion (3a) of the corrugated fin (3), and on the upper surface side, the louver (17) is in a predetermined form. I'm standing up. Therefore, of the water adhered to the upper surface of the flat portion (3a) of the corrugated fin (3), the crushed portion of the louver (17)
The flow of water to the leeward side in the range where (17a) exists (the range indicated by Y in FIG. 2) is obstructed by the rising portion of the louver (17) on the upper surface side, as shown by the arrow in FIG. Crushed part (1
Flow along the inside of the flat part (3a) in the width direction along
It falls down through the through-hole (18) created when forming (17). In addition, water adhering to other parts also
Fall from (18).

In the above embodiment, the bent portion (3b) of the louvered corrugated fin (3) has a semi-elliptical shape obtained by cutting the ellipse along the long axis. Therefore, the contact area between the corrugated fin (3) and the flat hollow body (2) is larger than when the bent portion is semicircular, and the heat transfer efficiency is improved. Also, the length of the louver (17) and the through hole (18) with respect to the entire width of the flat portion (3a) is larger than that in the case where the bent portion is semicircular, so that the The drop efficiency of the water through the through hole (18) is also improved as compared with the case where the bent portion is semicircular. However, the bent portion is not limited to a semi-elliptical shape.

In the above embodiment, the method of the present invention is formed by joining the peripheral portions of two vertical rectangular aluminum plates (4) and
(4) a plurality of refrigerant distribution passages having a swelling refrigerant passage (5) between them and a header forming portion (6) (7) bulging out from the refrigerant passage (5) and connected to the refrigerant passage (5); The flat hollow bodies (2) are arranged in parallel, and the header forming parts (6) and (7) are joined so that they communicate with each other, and the adjacent hollow bodies for refrigerant circulation
(2) Applied to the manufacture of evaporator (1) with corrugated fins (3) with louvers between them, but is not limited to this, and is arranged so that the straight pipe part faces up and down. The present invention is also applicable to an evaporator in which a corrugated fin with a louver is arranged between adjacent straight pipe portions of the meandering flat tube.

[0019]

As described above, in the evaporator manufactured by the method of the present invention, the water attached to the upper surface of the flat portion of the corrugated fin has the leeward side of the water where the crushed portion of the louver exists. Is blocked by the upward rising portion of the louver, flows inward in the width direction along the crushed portion, and falls downward from a through hole formed when the louver is formed. Therefore, the amount of scattered water is smaller than when the crushed portion is present on the upper surface side of the flat portion.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing a corrugated fin with a louver of an evaporator manufactured by the method of the present invention.

FIG. 2 is an enlarged front view showing a part of an evaporator manufactured by the method of the present invention.

FIG. 3 is an exploded perspective view with a part cutaway showing a flat hollow body of an evaporator manufactured by the method of the present invention.

FIG. 4 is a perspective view showing an entire evaporator manufactured by the method of the present invention.

FIG. 5 is a perspective view showing a method for manufacturing a corrugated fin with a louver.

FIG. 6 is a partially enlarged side view of the same.

FIG. 7 is an enlarged perspective view showing a corrugated fin with a louver of a conventional evaporator.

FIG. 8 is an enlarged front view showing a part of a conventional evaporator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 2 Flat hollow body for refrigerant | coolant distribution (refrigerant distribution part) 3 Corrugated fin with a louver 10 Air distribution part 17 Louver 50 Metal thin plate 60 Gear-shaped cutter 70 Gear-shaped cutter

Claims (1)

(57) [Claims] 1. A plurality of vertically extending refrigerant circulation portions are provided in parallel, a portion between adjacent refrigerant circulation portions serves as an air circulation portion, and a corrugated fin with a louver is arranged in the air circulation portion. Forming a louver by passing a thin metal plate between a pair of rotating gear-shaped cutters, bending the louver in a meandering shape, and cutting the louver into a predetermined length to form a corrugated louver. After the fins are formed, the corrugated fins are arranged in the air circulation portion such that the front side in the advancing direction faces upward when passing between the pair of gear-shaped cutters. Manufacturing method.