JPH0820196B2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used for refrigeration / air conditioning equipment and the like.

2. Description of the Related Art In recent years, heat exchangers have been widely used in the refrigeration and air-conditioning industries, etc., and in response to the demand for compactness, L-shaped, C-shaped, U-shaped, etc. bent heat exchangers are also available It has become various.

 The conventional heat exchanger will be described below.

FIG. 5 shows a conventional heat exchanger. In FIG. 5, 1 is a small fin having a corrugated surface, which is finely divided and arranged at a predetermined pitch.
Reference numeral 2 denotes a heat medium pipe arranged in a meandering shape, which is provided orthogonal to the small piece fins 1 and constitutes a heat exchanger 3.

The bending method of the heat exchanger 3 configured as described above will be described below.

FIG. 6 shows a bending apparatus for a heat exchanger. In FIG. 6, reference numeral 4 denotes an apparatus main body used for bending the heat exchanger 3, and a bending die 5 having a cylindrical surface corresponding to a predetermined bending radius in a part thereof is detachably attached. Reference numeral 6 denotes a rotating arm, which is rotatable about a center point 7 of the cylindrical surface of the bending die 5. A pressing plate 8 is slidably joined to the rotary arm 6. A clamp device 9 is slidably attached to the device body 4, and is configured to fix one end of the heat exchanger 3 to be bent. A pressing device 10 is driven by air pressure, hydraulic pressure, etc. and moves in the axial direction, and is provided rotatably around a fulcrum 11. One end of the pressing device 10 is rotatably connected to the rotary arm 6. The sixth
In the figure, the initial state is shown by a dashed line.

Next, a method of bending the heat exchanger 3 will be described with reference to FIG. First, each part is set to the initial state shown by the one-dot chain line in the figure. That is, the heat exchanger 3 which is an assembly of the substantially straight small piece fin 1 and the heat medium pipe 2 is set, and one end of the heat medium pipe 2 is fixed by the clamp device 9. Then, the pressing device 10 is operated to rotate the rotary arm 6 to a predetermined position. By this operation, the heat exchanger 3 which is substantially straight in the assembled state is curved along the cylindrical surface of the bending die 5, and the partially-curved heat exchanger 3 is completed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, when a partially curved heat exchanger is manufactured by the above-described method, the small fins 1 may be formed due to the inclination of the corrugations, such as when the corrugated small fins 1 are made thin. Since the small fins 1 do not contact the bending mold vertically and the stiffness of the small fins 1 is weak, the small fins 1 in contact with the bending mold 5 are partially bent to block the air passage between the small fins as shown in FIG. 7 to improve the heat exchange efficiency. It had a problem of lowering.
Further, if the small fins 1 are severely bent, the heat medium pipe 2 may buckle, and the heat medium pipe 2 may no longer be used as a heat exchanger.

In view of the above problems, the present invention provides a heat exchanger that does not cause bending of the small fins or buckling of the heat medium pipe even when the small fins having a corrugated surface are thinned.

Means for Solving the Problems In order to solve the above problems, the heat exchanger of the present invention is one in which at least the edge of the fin of the small piece that is in contact with the bending die is flattened vertically to the heat medium pipe. is there.

This structure eliminates the effect of the corrugated tilt,
Since the small piece fins are in contact with the bending die perpendicularly, the bending of the small piece fins that come into contact with the bending die is strengthened during bending and bending is suppressed, and buckling of the heat medium pipe can also be prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a heat exchanger according to an embodiment of the present invention. In the figure, reference numeral 21 denotes a heat exchanger, which is partially curved by a bending method similar to the conventional one to form an L-shaped heat exchanger. 22 is a corrugated small piece fin,
When the heat exchanger 21 is bent, the heat medium tubes are subjected to flat processing 22a at the edges in contact with the bending die, which are arranged at a predetermined pitch. Reference numeral 23 is a heat medium pipe arranged in a meandering shape and is orthogonal to the small piece fins 22. 2 is a front view of the small piece fin 22, FIG. 3 is a side view of the small piece fin 22, and FIG. 4 is a sectional view at the time of bending.

As described above, according to the embodiment, as shown in FIG. 4, the flat fin 22a formed on the small fin 22 eliminates the influence of the inclination of the corrugating process. Since the fins 22 are in vertical contact with each other, the waist of the small piece fins 22 is strengthened and can be prevented from bending.
This enables the fins 22 to be made even thinner.

EFFECTS OF THE INVENTION The present invention, by bending the edges of the corrugated small piece fins on the side that comes into contact with the bending process when bending the heat exchanger, suppresses the bending of the small piece fins and reduces the gap between the small piece fins. It is possible to realize an excellent heat exchanger capable of exhibiting stable performance without blocking the air passage and further promoting the thinning of the small piece fins to reduce the material.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat exchanger in one embodiment of the present invention,
2 is a front view of the small piece fin, FIG. 3 is a side view of the small piece fin of FIG. 2, and FIG. 4 is a bending die and a small piece when the heat exchanger shown in FIG. 1 is bent. FIG. 5 is a cross-sectional view showing the contact state of the fins, FIG. 5 is a perspective view of a conventional heat exchanger, FIG. 6 is a structural view showing a bending device of the heat exchanger, and FIG. 7 is a bending die during bending. It is sectional drawing which shows a mode that bending of a small piece fin generate | occur | produces. 5 …… Bending die, 21 …… Heat exchanger, 22 …… Small fin,
22a: Flat processing, 23: Heat medium tube.

Claims (1)

[Claims] 1. A heat medium pipe comprising a small piece fin finely divided and arranged at a predetermined pitch and corrugated, and a heat medium tube orthogonal to the small piece fin. The heat medium tube to which the small piece fin is attached is partly provided. A heat exchanger characterized in that at the time of bending, at least the edge of the small-piece fin that is in contact with the bending die is flattened vertically to the heat medium tube.