JPH11104767A - Manufacturing device of tube for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a sufficient formability across the total length of the tube by eliminating the adjustment of a forming roll. SOLUTION: The device is constituted to manufacture a large number of tube parts by passing a flat belt tube material P through plural rolls 15A-15G opposingly arranged, and forming it in succession in a flat tube shape with a bead to divide the media passage inside the tube into blocks as well as cutting it in a given length. In this case, an adjustable/movable roll 18 is installed after a finish sizing roll 15G.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing 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. To a manufacturing apparatus.

[0002]

2. Description of the Related Art Generally, as a heat exchanger, a parallel flow type heat exchanger constituted by stacking a plurality of tubes via fins and connecting respective ends of these tubes to a header pipe is used. Are known. In this heat exchanger, a medium for heat exchange is passed through a tube between the inlet and outlet joints provided in the header pipe while meandering a plurality of times, and exchanges heat with the atmosphere in the tube flowing process. It is configured.

[0003] The manufacture of this heat exchanger is based on tubes, fins, header tanks, side plates, outlet joints,
The components such as the inlet joint are separately manufactured, and these required components are temporarily assembled to form a temporary assembly, and the temporary assembly is integrally brazed in a furnace.

[0004] The tubes of the heat exchanger play an important role as a main element of heat exchange, and it is necessary to manufacture them with sufficient dimensional accuracy according to a predetermined design, and a relatively large number of tubes of the same shape are used. Since one heat exchanger is required, a long material is formed into a predetermined tubular shape having the same cross-sectional shape, and cut into the same length to efficiently produce a large number of tube parts.

That is, a flat band (belt) -shaped tube material made of metal is formed into a flat tube shape for a tube by a cold roll forming process.
Next, by the cutting process, cut to the same tube length,
Further, in the final brazing step, the tube main part is brazed to complete the tube.

In recent years, a medium flow path inside a tube has been
A bead that is divided into a plurality of sections is formed integrally with the tube, and the heat exchange property and the pressure resistance of the tube are improved by the bead. , Provided before the flat tube forming process.

[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.

Further, the feeding of the tube material is basically performed by each roll driven to rotate, and the diameter of each roll is gradually increased from upstream to downstream in the feeding direction. By setting or increasing the rotation speed of each roll, a tensile stress is always applied to the tube material to ensure smooth feeding and good formability.

[0009] The feeding speed of the tube material is
Since it is directly related to the number of products produced per unit time,
If sufficient formability can be ensured, the feeding speed is set as high as possible.

[0010]

However, in an apparatus for manufacturing a tube for a heat exchanger using a roll forming machine,
Ensuring a sufficient overall shape as a tube part,
That is, there has been a problem that it is difficult to accurately form the tube shape.

That is, even after the tube material is formed, even if its cross-sectional shape is formed into an appropriate tube shape, it is warped or bent in the longitudinal direction of the tube due to the asymmetric cross-section provided with beads and the like. Deformation such as twisting, undulation, etc. may occur. In particular, when such deformation occurs locally, the tube component unit cannot be used as a defective product.

In particular, the tube material being formed is
These deformations are alleviated by the tensile stress in the longitudinal direction generated when the paper is fed, and the tensile stress is released after cutting of each tube component, so that there is a possibility that the full-length shape is deformed. .

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.

However, since these adjustments involve adjusting a large number of rollers, even a skilled worker takes time and effort to make adjustments, and the relationship between the rollers is complicated, and various factors affect each other. Therefore, it was difficult to ensure sufficient tube formability.

Accordingly, an object of the present invention is to provide an apparatus for manufacturing a tube for a heat exchanger that can ensure sufficient formability over the entire length of the tube without adjusting a forming roller.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a flat tubular member provided with a bead for passing a flat strip-shaped tube material between a plurality of opposed rolls to sequentially define a medium flow path in the tube. In a heat exchanger tube manufacturing apparatus for manufacturing a large number of tube parts by cutting to a predetermined length, a heat-exchanger having a configuration in which a sizing roll for finishing and a roll that can be adjusted and moved are provided. This is a tube manufacturing device.

As described above, since the roll that can be adjusted and moved is provided after the finishing sizing roll, the roll can correct the distortion such as the twist in the longitudinal direction of the tube material, and the formability over the entire length of the tube can be improved. It can be secured well.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The heat exchanger 1 of the present embodiment is, as shown in FIG.
It mainly comprises a plurality of tubes 2 and 2 stacked in parallel with each other with fins 5 and 5 interposed therebetween, and header pipes 3 and 4 disposed at both ends of these tubes 2 and 2.

Each of the header pipes 3 and 4 is formed in a tubular 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 positions. Further, at a predetermined position, an inlet joint 3a for taking in the medium and an outlet joint 4a for discharging the medium to the outside.
Is provided. Furthermore, tube holes 9, 9 are formed at predetermined intervals in the longitudinal direction of each header pipe 3, 4, and each end of the tubes 2, 2 is inserted into these tube holes 9, 9. Tubes 2 and 2 are fixed to each header pipe 3 and 4 by brazing each part.

Incidentally, side plates 8 are arranged above and below the tubes 2 and 2 and the ends thereof are connected to the respective header pipes 3.
4, the side plates 8 reinforce the structural strength of the heat exchanger 1 and
Tube 2 is protected.

As described above, since the heat exchanger 1 of this embodiment is configured, the medium taken in from the inlet joint 3a is:
The gas flows in a meandering manner a plurality of times so as to reciprocate through the header pipes 3 and 4 in units of a predetermined tube group. Further, the heat exchange area is increased by the fins 5 interposed between the tube 2 and the side plate 8, so that the heat exchange efficiency can be promoted.

As shown in FIG. 2, the tube 2 which is the main part of the heat exchange is formed in an oval shape having a cross section parallel to each other and the flow rate of the medium flowing through the inside. A predetermined height and width that are optimal for efficiency and heat exchange efficiency are set, and beads 21 that partition the internal flow path into a plurality of sections are provided.
21 are integrally provided.

The tube 2 is manufactured by using a brazing sheet made of an aluminum alloy having excellent heat conductivity, moldability and brazing properties in a thin plate shape as an original tube material.

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, thereby forming an elliptical shape. It has been produced.

In the figure, reference numeral 22 denotes a joint, 23
Is a bent portion, and 24 is a medium flow path defined by the beads 21 and 21. The forming process of the beads 21 and 21, the forming process of the joining portions 22 and 22, and the bending process of the bent portion 23 are as follows. As described later, this is performed by roll forming.

As shown in FIG. 3, a tube manufacturing apparatus 11 for manufacturing such a tube includes a supply unit 12 for continuously supplying a tube material P for the tube, and a tube unit P for supplying the tube material P. Deformation processing in the width direction, sequentially
It is composed of a roll forming machine 13 that forms a bead 21 and a joint 22 and bends in a predetermined manner, and a cutting machine 14 that cuts the formed tube material P into a predetermined length in the longitudinal direction.

That is, the tube material P is wound as a belt-shaped tube material around a drum body and stored in the supply unit 12, and the drum unit is rewound to provide the supply unit 12.
, The tube material P is continuously fed, and firstly, 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. And it is manufactured as a tube part.

The step of brazing the tube parts to complete the tube is performed simultaneously with the brazing of the other parts, and the brazing is performed to complete the heat exchanger 1. That is, the tube parts and other main parts are temporarily assembled, and this temporarily assembled body is integrally brazed in a furnace.

The roll forming machine 13 includes a plurality of rolls 15A to 15A which are sequentially arranged at a predetermined opposing angle from a linear upstream to a downstream along a feeding direction and are driven to rotate at a predetermined angle.
The tube material P is composed of 5G groups, and the tube material P is gradually deformed in the width direction, and finally, as described above, its cross-sectional shape is deformed into an oval shape having plane portions parallel to each other.

That is, the state of the tube material P at the stage of forming by each roll is such that the tube material P is formed substantially at the center in the width direction after the bead is formed, as shown in FIGS. The portion becomes the starting point of bending, and while gradually maintaining a predetermined radius at the central portion, the bending angle increases, and both ends in the width direction of the tube material P come into contact with each other. It is formed into a predetermined tube shape having a flow path.

As shown in FIG. 5, prior to the tube forming, using a similar roll forming technique, as described above, a projecting shape continuous in the longitudinal direction or a spot-shaped circular bead is used. A roll forming machine 16 for forming the material is provided, and a bead is formed at a predetermined position of the tube material P by each of the rolls 17A to 17C of the roll forming machine 16,
After completion of the tube, the beads are used to divide the inside flow path of the tube into a plurality of parts, or to generate a turbulent flow in the medium passing through the flow path, thereby improving the heat exchange property and pressure resistance of the tube itself.

Although illustration is omitted at an appropriate place in the molding path, the tube material P
Is formed into a predetermined shape, and a straightening roll for preventing twisting or deforming due to residual stress or the like is also provided.

Immediately after the roll forming machine 13, a cutting machine 14 is provided. The cutting machine 14 operates in synchronization with the preceding roll forming machine 13, and operates in a direction perpendicular to the transfer direction. The tube material P, which is mainly configured using a cutter that operates at high speed and is fed, is always cut into the same length as the tube 2.

Further, in this embodiment, as shown in FIG. 6, an adjustable cross roll 18 is newly added to the final position of the forming path in the roll forming machine. To ensure a good shape.

The cross roll 18 is composed of two sets of rolls facing each other in the up-down direction and the left-right direction, and is movably supported in an arbitrary three-dimensional direction by a support mechanism (not shown).

That is, the cross roll 18 has two roll axes 19A and 19B facing each other and having roll axes perpendicular to each other.
The outer shape of 19B is formed so as to have an outer shape in a predetermined tube cross section at a contact portion with the tube material.

Further, the cross roll 18 is arranged such that the cross-section of the tube material P, which has a cross-sectional shape formed into a tube shape by the support mechanism, is X in the width direction of the tube material P.
In the thickness direction of the tube-shaped material, or in the Y direction, which is the thickness direction of the tube-shaped material.
In the Z direction along the feeding direction of the image forming apparatus.

The support mechanism allows the relationship between the center distance of the cross roll 18 and the roll axis to be arbitrarily changed. That is, two sets of rolls 19A,
In 19B, it is possible to arbitrarily set the relationship between the inter-axis distances and the roll axis lines between these sets, and also to set the inter-axis distance and the roll axis lines between the rolls 19A and 19B of each set. It can be set arbitrarily.

Accordingly, only by changing the setting of the cross roll 18 as described above, the setting of the forming rolls 15A to 15G and 17A to 17C upstream of the cross roll 18 is not changed. It is possible to correct distortion such as torsion in the longitudinal direction and to ensure good moldability over the entire length of the tube.

In this embodiment, the cross roll is constituted by two sets of rolls facing each other. However, the present invention is not limited to this, and may be a combination of a large number of multi-divided rolls. Various fine adjustments can be made, a material having special moldability can be used, or a tube having a different shape can be accommodated.

[0042]

As described above, the present invention is provided with a bead for passing a flat strip-shaped tube material between a plurality of rolls arranged opposite to each other to sequentially define a medium flow path in the tube. In a heat exchanger tube manufacturing apparatus that is formed into a flat tubular shape and cut to a predetermined length to manufacture a large number of tube parts, a heat adjusting structure in which a sizing roll for finishing is provided followed by a roll that can be adjusted and moved. This is a device for manufacturing tubes for exchangers.

As described above, since the adjustable sizing roll is provided after the finishing sizing roll, the roll can correct the distortion such as the twist in the longitudinal direction of the tube material, and the formability over the entire length of the tube can be improved. It can be secured well.

[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 of a heat exchanger tube manufacturing apparatus according to the present embodiment.

4 (1) to 4 (4) are views taken along arrows (I) to (VI) in FIG. 3 showing respective stages of a tube forming process.

FIG. 5 is a view (V) in FIG. 3 showing a bead forming step according to the present example.

FIG. 6 is a diagram showing a main part of a cross roll according to the present embodiment.
It is an arrow (VI) view in a middle.

[Description of sign]

 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 device 12 Supply unit 13 Roll forming machine 14 Cutting machine 15A to 15G bending Forming Roll 16 Bead and Joining Roll Forming Machine 17A-17C Forming Roll 18 Cross Roll 19A-19B Roll 21 Bead 22 Joining Section 23 Bending Section 24 Split Channel P Tube Material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Sadao Haiya 39, Higashihara, Chiyo-ji, Odai-gun, Osato-gun, Saitama Prefecture Inside of Xexel Konan Plant (72) Inventor Takashi Sugita Higashihara, Oji-gun, Onan-gun, Saitama No. 39 Inside the Xexel Gangnam Plant (72) Inventor Katsuji Akiyama Higashihara, Chiyo-ji, Odai-gun, Osato-gun, Saitama 39 Inventor Takafumi Umehara Takahara Uenohara, Chiyo-ji, Chiyo-ji, Konan-cho, Osato-gun, Saitama No. 39 Inside Zexel Gangnam Plant

Claims (1)

[Claims] 1. A flat strip-shaped tube material is passed between a plurality of rolls disposed opposite to each other to form a flat tube having beads each defining a medium flow path in the tube, and has a predetermined length. An apparatus for manufacturing a tube for a heat exchanger, which cuts into a plurality of tube parts to produce a large number of tube parts, wherein a roll capable of adjusting and moving is provided after a sizing roll for finishing.