JP3779447B2 - Manufacturing equipment for heat exchanger tubes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing apparatus for manufacturing a large number of heat exchanger tubes by forming a flat strip-shaped tube material into a predetermined flat tube shape by roll forming and cutting it into a predetermined length.
[0002]
[Prior art]
In general, a heat exchanger of a parallel flow type is known, in which a plurality of tubes are stacked via fins, and each end of these tubes is connected in communication with a header pipe. In this heat exchanger, a medium for heat exchange is passed between the inlet and outlet joints provided in the header pipe through a tube while meandering a plurality of times, and heat exchange with the atmosphere is performed in this tube flow process. It is configured.
[0003]
In addition, this heat exchanger is manufactured by separately manufacturing parts such as tubes, fins, header tanks, side plates, outlet joints, inlet joints, etc., and temporarily assembling these required parts. The temporary assembly is manufactured by brazing together in a furnace.
[0004]
The heat exchanger tube plays an important role as a main component of the heat exchange, and it is necessary to manufacture the tube with sufficient dimensional accuracy according to a predetermined design. Since it is necessary for the heat exchanger, a large number of long materials are efficiently produced as tube parts by forming them into a predetermined tube-like shape with the same cross section and cutting them into the same length.
[0005]
That is, a metal flat belt (belt) tube material is formed into a flat tube shape for a tube by a roll forming process (cold roll forming), and then the same tube length is formed by a cutting process. Then, the tube main part is brazed by a final brazing process to complete the tube.
[0006]
Also, in recent years, a bead that forms a bead is formed by integrally forming a bead that divides a medium flow path inside a tube into a tube, and improving the heat exchange performance and pressure resistance of the tube by this bead. The process is also provided before the flat tube forming process, using a roll forming technique.
[0007]
These roll forming steps are performed by passing a tube material between a plurality of appropriately arranged rotating rolls each having a predetermined shape.
[0008]
In addition, the feeding of the tube material is basically performed by each roll that is rotationally driven, and the diameter of each roll is set to be slightly larger sequentially from upstream to downstream in the feeding direction. In addition, the rotational speed of each roll is increased so that a tensile stress is always applied to the tube material to ensure smooth feeding and good formability.
[0009]
And the feeding speed of this tube material is directly related to the production number per unit time, so if sufficient formability can be secured, the feeding speed is set as high as possible. .
[0010]
[Problems to be solved by the invention]
However, in a heat exchanger tube manufacturing apparatus using a roll forming machine, there has been a disadvantage that it is difficult to ensure a sufficient overall shape as a tube component, that is, to accurately form the tube shape.
[0011]
That is, after forming the tube material, even if the cross-sectional shape is formed into an appropriate tube shape, the bead is provided and the cross-section is asymmetrical, so that the tube is warped, bent, twisted, Deformations such as swell may occur. In particular, when such deformation occurs locally, the tube part unit cannot be used as a defective product.
[0012]
In particular, the tube material in the middle of molding is relaxed by the longitudinal tensile stress generated when it is fed, and this tensile stress is released after the tube part unit is cut. As a result, the full-length shape may be deformed.
[0013]
Therefore, conventionally, various adjustments such as adjustment by setting the roll axis of each roller, changing the roll diameter, and adjusting by increasing or decreasing the distance between the roll axes are performed.
[0014]
However, since these adjustments adjust a large number of rollers, even a skilled person takes time to make adjustments, and the influence relationship between the rollers is complicated and various factors influence each other. It was difficult to ensure sufficient tube formability.
[0015]
Accordingly, an object of the present invention is to provide an apparatus for manufacturing a heat exchanger tube that can secure sufficient formability over the entire length of the tube without adjusting the forming roller.
[0016]
[Means for Solving the Problems]
According to the present invention, a flat strip-shaped tube material is formed into a flat tubular shape having beads for partitioning a medium flow path in the tube by passing between a plurality of opposedly arranged rolls, and having a predetermined length. In a heat exchanger tube manufacturing apparatus that cuts and produces a large number of tube parts, a roll that can be adjusted and moved is provided after a sizing roll for finishing, and the roll (18) , Each of which is composed of two sets of rolls (19A, 19A), (19B, 19B) facing each other and having a roll axis orthogonal to each other, and the roll (18) is supported by the tube material (P ) In the width direction (X direction) of the tube material (P), the thickness direction (Y direction) of the tube-shaped material (P), and the feeding direction (Z direction) of the tube material (P). An apparatus for manufacturing a heat exchanger tube arrangement is provided to be a predetermined amount of movement.
[0017]
In this way, since a roll that can be adjusted and moved is provided after the sizing roll for finishing, this roll can correct distortion such as torsion in the longitudinal direction of the tube material and ensure good formability over the entire length of the tube. can do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.
[0019]
As shown in FIG. 1, the heat exchanger 1 of the present example mainly includes a plurality of tubes 2 and 2 laminated in parallel with each other via fins 5 and 5, and both ends of these tubes 2 and 2. The header pipes 3 and 4 are arranged.
[0020]
Each header pipe 3 and 4 is formed in a circular tube shape, the upper and lower end openings are closed by blind caps 6, and the interior is partitioned by partition plates 7 and 7 disposed at predetermined locations, An inlet joint 3a for taking the medium into the inside and an outlet joint 4a for discharging the medium to the outside are provided at predetermined locations. Furthermore, tube holes 9 and 9 are formed at predetermined intervals in the longitudinal direction of the header pipes 3 and 4, and the end portions of the tubes 2 and 2 are inserted into these tube holes 9 and 9, Each part is brazed and the tubes 2 and 2 are fixed to the header pipes 3 and 4.
[0021]
Note that side plates 8 are arranged above and below the tubes 2 and 2, and end portions thereof are fixed to the header pipes 3 and 4, respectively. The side plates 8 provide structural strength of the heat exchanger 1. And the tube 2 is protected.
[0022]
Thus, since the heat exchanger 1 of this example is configured, the medium taken in from the inlet joint 3a meanders a plurality of times so as to reciprocate the header pipes 3 and 4 in a predetermined tube group unit. It flows through, exchanges heat with the outside while passing through each tube 2, and is discharged from the outlet joint 4a. Moreover, since the heat exchange area is increased by the fins 5 interposed between the tube 2 and the side plate 8, the heat exchange efficiency can be promoted.
[0023]
As shown in FIG. 2, the tube 2 which is the main part of the heat exchange is formed in an oval shape whose cross-sectional shape has parallel plane portions, and the flow efficiency and heat of the medium flowing through the inside are formed. A predetermined height and width that are optimum for the exchange efficiency are set, and beads 21 and 21 that divide the internal flow path into a plurality of pieces are integrally provided.
[0024]
The tube 2 is manufactured by using a brazing sheet made of an aluminum alloy having a thin plate-like thermal conductivity and good formability and brazing as an original tube material.
[0025]
That is, the tube 2 is formed by bending a tube material having a predetermined width at the center in the width direction while maintaining a predetermined curvature to form an oval shape, and joining both ends facing each other by bending. Has been.
[0026]
In the figure, reference numeral 22 denotes a joining portion, 23 denotes a bent portion, and 24 denotes a medium flow path partitioned by beads 21 and 21, and these beads 21 and 21 are formed and joined portions 22 and 22. The forming process and the bending process of the bending part 23 are performed by roll forming as described later.
[0027]
And as shown in FIG. 3, the tube manufacturing apparatus 11 which manufactures such a tube makes the supply part 12 which supplies the tube raw material P of a tube continuously, and the fed tube raw material P to the width direction. It is composed of a roll forming machine 13 that deforms and sequentially forms a bead 21 and a joining portion 22 and performs a predetermined bending process, and a cutting machine 14 that cuts the formed tube material P into a predetermined length in the longitudinal direction. Yes.
[0028]
That is, the tube material P is wound around the drum body as a belt-like tube material, stored in the supply unit 12, and the drum material is rewound to continuously feed the tube material P from the supply unit 12. First, the cross-sectional shape is formed into a predetermined flat tube shape by the roll forming machine 13, and then cut into a predetermined length in the longitudinal direction by the cutting machine 14 to produce a tube part.
[0029]
In addition, the process of brazing this tube component and completing as a tube is performed simultaneously with brazing of other components, and this heat brazing is performed and the heat exchanger 1 is completed. That is, tube parts and other main parts are temporarily assembled, and this temporary assembly is brazed together in a furnace.
[0030]
The roll forming machine 13 is composed of a plurality of rolls 15A to 15G that are sequentially arranged at a predetermined facing angle from a straight upstream side to a downstream side along the feeding direction and are driven to rotate in a predetermined manner. The tube material P is deformed in the width direction, and finally, as described above, the cross-sectional shape thereof is deformed into an oval shape having flat portions parallel to each other.
[0031]
That is, the tube material P in the forming stage by each roll is formed at the substantially central portion in the width direction after the bead is formed, as shown in FIGS. 4 (1) to (4). The bending angle gradually increases while maintaining a predetermined radius at the central portion, the both ends of the tube material P in the width direction are brought into contact with each other, and finally the flow path is formed inside. It is formed into a predetermined tube shape.
[0032]
In addition, as shown in FIG. 5, before the tube forming, using the same roll forming method, as described above, a projecting shape continuous in the longitudinal direction or a spot-like circular bead is formed in advance. A roll forming machine 16 is provided, and each roll 17A to 17C of the roll forming machine 16 forms a bead at a predetermined location of the tube material P, and after the tube is completed, the bead is partitioned into a plurality of flow paths inside the tube. The turbulent flow is generated in the medium passing through the flow path to improve the heat exchange property and pressure resistance of the tube itself.
[0033]
Further, although not shown at appropriate portions of the forming path, the tube material P is formed into a predetermined shape at each stage, and is used for correction to prevent twisting or deformation due to residual stress or the like. Rolls are also provided.
[0034]
Immediately after the roll forming machine 13, a cutting machine 14 is disposed. The cutting machine 14 operates in synchronization with the preceding roll forming machine 13 and operates mainly at a high speed in a direction orthogonal to the transfer direction. The tube material P that is configured and fed using a cutting cutter is always cut into the same length as the tube 2.
[0035]
Furthermore, in this example, as shown in FIG. 6, a cross roll 18 that can be adjusted and moved is newly added to the final position of the forming path in the roll forming machine, and the cross roll 18 extends over the entire length of the tube. A good shape can be secured.
[0036]
The cross roll 18 includes two sets of rolls facing each other in the vertical direction and the horizontal direction, and is supported so as to be movable in an arbitrary three-dimensional direction by a support mechanism (not shown).
[0037]
That is, this cross roll 18 is composed of two sets of rolls 19A and 19B that have mutually perpendicular roll axes and are opposed to each other. The outer shape of each of the rolls 19A and 19B is at the point of contact with the tube material. It is formed to have an outer shape in a predetermined tube cross section.
[0038]
The cross roll 18 is moved by a support mechanism by a predetermined amount in the X direction, which is the width direction of the tube material P, with respect to the tube material P whose cross-sectional shape is formed into a tube shape. A predetermined amount can be moved in the Y direction, which is the thickness direction of the tube material, or a predetermined amount can be moved in the Z direction along the feeding direction of the tube material P.
[0039]
In addition, the support mechanism allows the inter-axial distance of the cross roll 18 and the relationship of the roll axis to be arbitrarily changed. That is, in the two sets of rolls 19A and 19B, the inter-axial distance between these sets and the set and the relationship between the roll axes can be arbitrarily set, and the axes of the respective rolls 19A and 19B can be set. The relationship between the distance and the roll axis can also be set arbitrarily.
[0040]
Therefore, only the setting change of the cross roll 18 is performed in this way, and the settings of the forming rolls 15A to 15G and 17A to 17C upstream of the cross roll 18 are not changed. It is possible to correct distortion such as torsion and to ensure good formability over the entire length of the tube.
[0041]
In this example, the cross roll is configured by two sets of rolls facing each other. However, the present invention is not limited to this, and a configuration in which a large number of multi-divided rolls are combined may be used. Adjustment can be performed, a material having a special formability can be used, or a tube with an irregular shape can be supported.
[0042]
【The invention's effect】
As described above, according to the present invention, a flat strip-shaped tube material is formed into a flat tube having beads that divide a medium flow path in the tube by passing between a plurality of opposedly arranged rolls. Along with a finishing sizing roll, an adjustment movable roll is provided in a heat exchanger tube manufacturing apparatus that cuts to a predetermined length to produce a large number of tube parts , The roll (18) is composed of two sets of rolls (19A, 19A), (19B, 19B) that have mutually perpendicular roll axes and are opposed to each other, and the roll (18) is supported by a support mechanism. , With respect to the tube material (P), the tube material (P) in the width direction (X direction), the tube shape material (P) in the thickness direction (Y direction), and the tube material (P) In the feeding direction (Z-direction) is a manufacturing apparatus for a heat exchanger tube arrangement is provided to be a predetermined amount of movement.
[0043]
In this way, since a roll that can be adjusted and moved is provided after the sizing roll for finishing, this roll can correct distortion such as torsion in the longitudinal direction of the tube material and ensure good formability over the entire length of the tube. Is something that can be done.
[Brief description of the drawings]
FIG. 1 is a front view showing a heat exchanger according to a specific example of the present invention.
FIG. 2 is a cross-sectional view showing a heat exchanger tube according to this example.
FIG. 3 is a side view showing a schematic overall configuration in a heat exchanger tube manufacturing apparatus according to the present embodiment.
FIGS. 4A and 4B are views taken along arrows (I) to (VI) in FIG. 3 showing each stage of the tube forming process according to the present example.
FIG. 5 is a view as viewed in the direction of arrow (V) in FIG. 3 showing a bead forming process according to the present example.
6 is a view taken along the arrow (VI) in FIG. 3 showing the main part of the cross roll according to this example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 3 Header pipe 3a Inlet joint 4 Header pipe 4a Outlet joint 5 Fin 6 Cap 7 Partition plate 8 Side plate 9 Tube hole 11 Tube manufacturing apparatus 12 Supply part 13 Roll forming machine 14 Cutting machine 15A-15G Bending Forming roll 16 Bead and joint roll forming machines 17A to 17C Forming roll 18 Cross rolls 19A to 19B Roll 21 Bead 22 Joining part 23 Bending part 24 Dividing flow path P Tube material

Claims (1)

A flat strip-shaped tube material is passed through a plurality of opposedly arranged rolls, and formed into a flat tube with beads that divide the medium flow path in the tube, and cut into a predetermined length, In a heat exchanger tube manufacturing apparatus that produces a large number of tube parts,
After the sizing roll for finishing, it is configured by providing a roll that can be adjusted and moved ,
The roll (18) is composed of two sets of rolls (19A, 19A) and (19B, 19B) which have mutually perpendicular roll axes and are opposed to each other.
Furthermore, the roll (18) is supported by a support mechanism with respect to the tube material (P) in the width direction (X direction) of the tube material (P) and the thickness direction (Y) of the tube shape material (P). Direction) and a feed direction of the tube material (P) (Z direction) .

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