JPS63220091A - Coil type passage for heat exchanger and heat exchanging coil unit employing said passage - Google Patents

Abstract

PURPOSE:To improve the flow of air through gaps between respective windings of a coil and permit the pitch of one winding of the coil to be reduced, by a method wherein the pipe of the coil is provided with a flat section and the major axis of the section is intersected with the central axis of the coil orthogonally or the same is intersected with an axis orthogonal to the central axis of the coil by an acute angle. CONSTITUTION:The section of a pipe 11 is flat and the major axis of the section is intersected orthogonally to the central axis of a coil 12 or the same is intersected with an axis orthogonal to the same central axis by an acute angle. The section of the pipe 11, forming a flow passage, is flat with respect to the flow direction of air or a direction of intersecting with the central axis of the coil 12, therefore, airflow, shown by arrow signs in a diagram, is smoothened, whereby efficient heat exchange between refrigerant, flowing through the inside of the coil, and air, cooling the outside of the coil, may be effected. On the other hand, the pitch of the coil 12 may be widened by a length corresponding to a difference between the length of the major axis and the same of the minor axis of the section of the pipe 11. In other words, the winding pitch of the coil 12 may be dense when the width of the gap between respective windings is the same.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a coil for a heat exchanger having a coil-shaped flow path and a coil unit for a heat exchanger using the same.

[Prior Art] A coil-shaped flow path as shown in FIGS. 5 and 6 through which a fluid such as a refrigerant passes is used in a heat exchanger.

Conventionally, as the pipe 1 for forming these coils 2, a pipe 1 made of aluminum, copper, or the like with good thermal conductivity has been used. Since these metal pipes 1 are easily deformed plastically by a slight stress, the cross section of the pipe 1 after being wound as a coil 2 is parallel to the central axis O of the coil 2, as shown in FIG. It has an elliptical or oblong shape that is flattened on the axis side.

[Prior Art] However, when the coil 2 having such a cross-sectional shape is used as a coil unit for heat exchange, the outer circumferential side becomes a barrier to air flow, and the rear side, that is, Air is difficult to wrap around the inner circumferential side of the coil 2.

Furthermore, since the height of the pipe 1 increases, the height of one turn of the coil 2 inevitably increases, and the pitch of the coil inevitably becomes coarser to some extent.

This invention was made in order to solve the above-mentioned problems in coil-shaped flow channels, and allows for good air circulation to the gaps between each winding of the coil constituting the coil, and a dense pitch for one winding. An object of the present invention is to provide a coil-shaped flow path for a heat exchanger that can be used in a heat exchanger, and a coil unit using the same.

[Means for Solving the Problem] The structure of the present invention will be described with reference to the reference numerals in FIGS. 1 to 4.

First, the coil-shaped flow path according to the first invention is shown in FIGS. 1 and 2.
As shown in the figure, the cross section of the pipe 11 is flat on one shoulder,
The long axis of the cross section is oriented in a direction perpendicular to the central axis of the coil 12 or in a direction that intersects at an acute angle with an axis perpendicular to the central axis.

Furthermore, in the coil unit according to the second invention, as shown in FIGS. 3 and 4, the cross section of the coiled pipe 11 is flat, and the long axis of the cross section is the central axis of the coil 12. A plurality of coil-shaped channels for a heat exchanger are prepared that are oriented in a direction perpendicular to each other or in a direction that intersects at an acute angle with an axis perpendicular to the concentric axis, and the winding pitch of the coil 12 is adjusted so that they are all equal. and connect the pipe 11 to the other party's coil 12.
A plurality of coils 12 are connected to each other by being inserted between the gaps between each winding.

[Function] In the coil-shaped flow path, as shown in FIG. 2, the pipe 11 forming the flow path is flattened in the direction in which the wind flows, that is, in the direction intersecting the central axis of the coil 12. Therefore, the air flows smoothly as shown by the arrow, and efficient heat exchange occurs between the refrigerant flowing inside and the air cooling the outside.

Furthermore, the pitch between the 120 turns of the coil can be increased by the amount of flattening. In other words, if the width of the gap between each winding is the same, the winding pitch of the coil 11 can be made closer. Furthermore, since there is a margin in the winding pitch, the coil unit as in the second invention can be made dense.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 to 4.

First, an embodiment of the first invention will be described with reference to FIGS. 1 and 2. When winding the pipe 11 for forming a flow path into a coil as shown in FIG. A pipe with a flat cross section is wound into a coil from the beginning. As a result, as shown in FIG.
can be formed.

The flow path cross section of the coil 12 can be formed into various shapes during the manufacturing process, for example, as shown in FIGS. 2(A) and 2(B),
In addition to oval, cocoon-shaped, and oval shapes, various shapes such as oval and rectangular shapes can be used. Set to a similar angle. Most commonly, it is directed toward the leads of the coil 12, as shown in FIGS. 1 and 2.

Next, as shown in FIGS. 3 and 4, the coil 12
A plurality of coils 12 are prepared and intertwined with each other, or the other coil 12 is inserted into the gap between each winding. This connects the plurality of coils 12 so that their central axes are parallel to each other.

In FIG. 4, coils 12 with leads in opposite directions are intertwined alternately, but coils with leads in the same direction can also be inserted into the gaps between the windings and connected. in this case,
The leads of adjacent coils 12 are all in the same direction.

Finally, connect both ends of these coils 12 to a metal plate (not shown).
etc., and connect the flow path. Thereby, a coil unit according to the second invention is obtained.

[Effects of the Invention] As explained above, in this invention, since the pipe 11 is flat in the direction in which air flows through the coil 12, efficient heat exchange is possible and the winding pitch of the coil 12 can be adjusted. Even if it is narrow, a sufficient gap can be maintained between each winding. Therefore, a dense coil unit can be formed, and in this respect as well, a highly efficient unit can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side view of a coil-shaped flow path for a heat exchanger showing an embodiment of the first invention, FIG. Embodiment 2 of the invention is an exploded side view of a coil unit, Figure 4 is a side view of the same coil unit, Figure 5 is a side view of a conventional example of a coil-shaped flow path for a heat exchanger, and Figure 6 is a side view of the same coil-type flow path. FIG. 2 is a longitudinal sectional view of a main part showing an example of a cross-sectional shape of a road.

Claims (2)

[Claims] (1) In a coil-shaped flow path for a heat exchanger in which a pipe 11 is wound into a coil, the cross section of the pipe 11 is flat, and the long axis of the cross section is perpendicular to or concentric with the central axis of the coil 12. A coil-shaped flow path for a heat exchanger characterized by being oriented in a direction that intersects at an acute angle with an axis perpendicular to the axis. (2) The cross section of the coiled pipe 11 is flat, and the long axis of the cross section is perpendicular to the central axis of the coil 12 or in a direction that intersects at an acute angle with an axis perpendicular to the central axis. Prepare a plurality of coil-shaped flow paths for a heat exchanger that are suitable for A heat exchange coil unit characterized by having coils 12 connected to each other.