JP2004025257A - Apparatus for producing corrugated fin for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing corrugated fins 5 for a heat exchanger by which the problems that the height of a part having a louvre is made higher than that other than the same on forming with a pair of forming rolls, and the occurrence of variation in the height of fins can be prevented. <P>SOLUTION: A pair of amplitude control boards 7 and 8 are arranged at the intermediate position in the axial direction of respective forming rolls 3 and 4, and proximately to the downstream side of the forming rolls 3 and 4. Then, the intervals between the retaining faces 6 of the amplitude control boards 7 and 8 are matched to the amplitude of the waves of the corrugated fins 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a corrugated fin manufacturing apparatus mainly interposed between a number of flat tubes arranged in parallel.
[0002]
[Prior art]
The corrugated fin supplies a thin metal strip between a pair of forming rolls meshing with each other, forms a bent shape in a waveform that progresses in the supply direction, and cuts many louvers on the rising and falling surfaces of each wave. It wakes up and forms. This louver has louver forming teeth arranged in a sawtooth cross section on the outer periphery of each forming roll. The corrugated fin thus formed is interposed between a pair of flat tubes 14 opposed to each other as shown in FIG. 7A, and a contact portion of the flat tubes 14 with the flat surface is integrally joined by means such as brazing. Is what you do.
[0003]
[Problems to be solved by the invention]
When a corrugated fin with a louver is formed by such a pair of forming rolls, the amplitude (height) of the portion where the louver exists is slightly higher than that of the end portion where the louver does not exist as shown in FIG. 7B. Tend to be. That is, the fins may have a variation of 0.2 mm to 0.3 mm in the height of the peaks. This is presumably because the radius of curvature at the folded portion at the top and the valley of the louver 11a-formed portion becomes smaller, and at the end where the louver 11a does not exist, the radius of curvature becomes larger.
[0004]
It should be noted that even in a reversal portion where the direction of the louver 11a is reversed, the amplitude tends to be higher in a portion where the width of the reversal portion is narrower than in other portions.
In such a case, if the pitch between the tubes is kept constant, it may cause poor connection between the tubes and the fins.
Then, this invention makes it a subject to solve such a problem.
[0005]
[Means for Solving the Problems]
According to the present invention, there is provided a corrugated fin for a heat exchanger, wherein a pair of corrugated forming rolls (3) (4) meshing with each other are provided, and a large number of louvers are formed on a rising surface and a falling surface of a corrugation. In the manufacturing equipment of
At the intermediate position in the axial direction of each forming roll (3) (4), the end is close to the downstream side of the forming roll (3) (4), and is adjusted so as to match the wave amplitude of the corrugated fin (5). An apparatus for manufacturing a corrugated fin for a heat exchanger, comprising at least a pair of amplitude regulating plates (7) and (8) whose pressing surfaces (6) are opposed to each other.
[0006]
The present invention described in claim 2 is based on claim 1,
Each of the amplitude regulating plates (7) and (8) is arranged such that the plane thereof is orthogonal to the axis of the forming rolls (3) and (4).
A pair of side guide plates (9) and (10) for guiding both widthwise side portions of the corrugated fin (5) are arranged at both axial ends of the forming rolls (3) and (4). This is a device for manufacturing dexterous corrugated fins.
The present invention described in claim 3 is based on claim 1,
The manufacturing apparatus for corrugated fins for a heat exchanger, wherein the plane of each of the amplitude regulating plates (7) and (8) is arranged in parallel with the axis of the forming rolls (3) and (4).
[0007]
The present invention described in claim 4 is the invention according to any one of claims 1 to 3,
On the upstream side of the supply path of the strip material (16), a pair of teeth that mesh with each other to bend the strip material (16) into a waveform, and cut and raise a large number of louvers on the rising and falling surfaces of the wave. A first forming roll (12) is arranged,
On the downstream side, a pair of second forming rolls (13) are arranged to perform compression of a fin pitch and formation of a corrugated shape by meshing only with the tip and the bottom of the tooth.
The pair of second forming rolls (13) comprises a pair of the forming rolls (3) and (4), and a pair of first forming rolls (12) and a pair of second forming rolls (13) are provided. This is an apparatus for manufacturing a corrugated fin for a heat exchanger in which a pair of side guide plates (9) and (10) are arranged on both sides in the axial direction.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of the manufacturing apparatus of the present invention, and is a schematic cross-sectional view taken along line II of FIG. 2 is a schematic plan view of the manufacturing apparatus, and FIG. 3 is a schematic view taken along the line III-III in FIG. Further, FIG. 4A is an explanatory view showing the meshing state of the pair of forming rolls 12a and 12b on the upstream side, and in particular, a partially enlarged view showing the cut-and-raised state of the louver, and FIG. 4B is a side view of the gear plate. It is a partial enlarged view.
[0009]
This manufacturing apparatus has a pair of first forming rolls 12 meshing with each other on the upstream side and a pair of second forming rolls 13 meshing with each other on the downstream side. The pair of first forming rolls 12 include a forming roll 12a and a forming roll 12b. In this example, a plurality of thin gear plates are stacked in the axial direction. As shown in FIG. 4, the tip of the gear plate has blade portions 1 and 2 formed diagonally on both sides of the tooth surface, whereby the louvers 11a are cut and raised on the rising and falling surfaces of the fin waveform. It is what is done. The cut-and-raised direction is opposite on one side and the other side in the width direction of the corrugated fin.
[0010]
As shown in FIG. 2, a pair of spacers 15 are interposed on both axial sides of the laminated gear plate, and a pair of side guide plates 9 and 10 are provided there. The side guide plates 9 and 10 do not limit the louver height, but merely guide the formed corrugated fin 5 in the downstream direction.
At both ends and the center of the forming rolls 12a and 12b, the outer periphery of the gear plate is formed parallel to the axial direction, and there is no blade portion as shown in FIG.
[0011]
Next, the pair of second forming rolls 13 on the downstream side are formed of a pair of forming forming rolls 3 and 4 that mesh with each other. In each of the forming rolls 3, 4, a number of thin gear plates are laminated in the axial direction, and the pitch of the teeth of the pair of gear plates is formed to be slightly smaller than that on the upstream side. In the pair of forming rolls 3 and 4, only the tooth tip 17 and the tooth bottom 17a mesh with each other, and the tooth surfaces between them do not contact. That is, the gear plate is formed as shown in FIG. 5 and only the top and bottom of the teeth contact the fins. For this reason, both side surfaces of the teeth in the same figure become cut-out concave portions 18, which are completely different from the tooth surfaces of the pair of first forming rolls indicated by chain lines.
[0012]
The louvers are not cut and raised by the forming rolls 3 and 4 on the downstream side, and the top and the valley of the corrugated fin 5 are formed and the pitch is reduced. Further, as shown in FIG. 2, a spacer 15 is formed between the stacked gear plate groups. The thickness of the spacer 15 is thinner than one of the gear plates of each gear plate group. At the same time, its outer diameter is smaller than the diameter of the gear root. The upstream ends of the amplitude regulating plates 7 and 8 are inserted into portions where the spacers 15 are located. As shown in FIG. 1, the opposing distance between the pressing surface 6 on the lower surface of the amplitude regulating plate 7 and the pressing surface 6 on the upper surface of the amplitude regulating plate 8 matches the target amplitude height of the corrugated fin 5.
[0013]
A pair of side guide plates 9 and 10 are arranged at both axial ends of the forming rolls 3 and 4.
The side guide plates 9 and 10 do not limit the louver height, but merely guide the formed corrugated fin 5 in the downstream direction.
Then, as shown in FIG. 1, a strip 16 made of a thin metal plate is first supplied to a pair of first forming rolls 12, and corrugation and louvers are cut and raised. Next, after the forming, it is supplied between a pair of forming rolls 3 and 4 on the downstream side, and is formed into a predetermined amplitude and a fin pitch. Next, the corrugated fin passes between a plurality of pairs of amplitude regulating plates 7 and 8, whereby the upper and lower end surfaces of each wave are clamped, and the amplitude is regulated, thereby completing the corrugated fin.
[0014]
Next, FIG. 6 shows another embodiment of the present invention. In this example, the planes of the amplitude regulating plates 7 and 8 are arranged parallel to the axes of the forming rolls 3 and 4. The height of the opposing planes is regulated so as to match the amplitude of the corrugated fin 5. In addition, a pair of side guide plates 9 and 10 are arranged at both ends of the amplitude regulating plates 7 and 8, respectively. This example is suitable for the case where the corrugated fin is formed only by the pair of first rolls 12 in FIGS. That is, when forming a corrugated fin having a relatively large amplitude, the corrugated fin is formed only by the pair of first rolls 12, so that it is suitable for that case.
[0015]
[Action and Effect of the Invention]
The manufacturing apparatus of the present invention is a pair of forming rolls 3 and 4 meshing with each other, and at least a pair of amplitude regulating plates 7 and 8 are provided at intermediate positions in the axial direction of the forming rolls 3 and 4, and opposing holding members are provided. The gap between the surfaces 6 is formed so as to match the amplitude of the wave of the corrugated fin 5.
Accordingly, the corrugated fins formed by the pair of forming rolls 3 and 4 have their tops and valleys held down by the pair of holding surfaces 6 and accurately regulate the height of the widthwise intermediate portion where the louvers are formed. be able to.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a manufacturing apparatus of a corrugated fin for a heat exchanger of the present invention, and is a schematic cross-sectional view taken along line II of FIG.
FIG. 2 is a plan view of the manufacturing apparatus.
FIG. 3 is a view taken along the line III-III in FIG. 1;
FIG. 4 is an enlarged longitudinal cross-sectional view of a main part showing a meshing state of a pair of forming rolls 12a and 12b and showing a louver cut-up state.
FIG. 5 is a partially enlarged plan view of a gear plate constituting a second forming roll 13 of the manufacturing apparatus.
FIG. 6 is an explanatory view showing another embodiment of the present invention, viewed from the same direction as FIG. 3;
FIG. 7 is an explanatory view of a corrugated fin for a heat exchanger, in which (A) is a perspective view and (B) is a front view.
[Explanation of symbols]
1, 2 louver forming blades 3, 4 forming rolls 5 corrugated fins 6 holding surfaces 7, 8 amplitude regulating plates 9, 10 side guide plates 11 louver groups 11a louvers 12 a pair of first forming rolls 12a, 12b forming rolls 13 a pair of 2nd forming roll 14 Flat tube 15 Spacer 16 Strip 17 Tooth tip 17a Root 17b Root 18 Concavity

Claims (4)

In a manufacturing apparatus of a corrugated fin for a heat exchanger, a pair of corrugated forming rolls (3) and (4) meshing with each other are provided, and a large number of louvers are formed on a rising surface and a falling surface of a corrugation.
At the intermediate position in the axial direction of each forming roll (3) (4), the end is close to the downstream side of the forming roll (3) (4), and is adjusted so as to match the wave amplitude of the corrugated fin (5). An apparatus for manufacturing a corrugated fin for a heat exchanger, comprising at least a pair of amplitude regulating plates (7) and (8) having their holding surfaces (6) opposed to each other. In claim 1,
Each of the amplitude regulating plates (7) and (8) is arranged such that the plane thereof is orthogonal to the axis of the forming rolls (3) and (4).
A pair of side guide plates (9) and (10) for guiding both widthwise side portions of the corrugated fin (5) are arranged at both axial ends of the forming rolls (3) and (4). Equipment for manufacturing corrugated fins. In claim 1,
An apparatus for manufacturing a corrugated fin for a heat exchanger, wherein a plane of each of the amplitude regulating plates (7) and (8) is arranged parallel to an axis of the forming rolls (3) and (4). In any one of claims 1 to 3,
On the upstream side of the supply path of the strip material (16), a pair of teeth that mesh with each other to bend the strip material (16) into a waveform, and cut and raise a large number of louvers on the rising and falling surfaces of the wave. A first forming roll (12) is arranged,
On the downstream side, a pair of second forming rolls (13) are arranged to perform compression of a fin pitch and formation of a corrugated shape by meshing only with the tip and the bottom of the tooth.
The pair of second forming rolls (13) comprises a pair of the forming rolls (3) and (4), and a pair of first forming rolls (12) and a pair of second forming rolls (13) are provided. An apparatus for manufacturing a corrugated fin for a heat exchanger in which a pair of side guide plates (9) and (10) are arranged on both sides in the axial direction.

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