JPH0886584A - Heat exchanger with fins - Google Patents

Abstract

(57) [Summary] [Object] To provide a plate fin heat exchanger used as an evaporator, in which condensed water (drain water) is less likely to remain on the surfaces of the plate fin and the refrigerant pipe. [Structure] Fin collar portion 2 arranged in the step direction (vertical direction)
On the surface of the flat plate fin 1 between them, the protrusions 3 in the row direction (horizontal direction) continuous in the step direction are provided. The length of the bottom portion in the row direction of the projections that are provided on the flat plate fin 1 between the fin collar portions 2 and that are continuous in the step direction is shorter than the diameter of the refrigerant pipe. A large number of cylindrical refrigerant pipes arranged orthogonally to the flat plate fins 2 are arranged in a zigzag pattern in the air flow direction, and the convex portions 3 connected in the step direction are one fin collar portion 2 of the flat plate fins 1. From the portion adjacent to the lower end to the portion adjacent to the upper end of the lower fin collar portion 2 arranged in the step direction. Further, the convex portions 3 which are continuous in the vertical direction on the surfaces of the flat plate fins between the fin collar portions 2 are formed by bending the flat plate fins 1 so that the cross section in the column direction is V-shaped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger with fins used as an outdoor unit evaporator of an air conditioner, and more particularly to fins for flat plates and fins on which condensed water is less likely to remain on the surfaces of refrigerant pipes. Regarding a heat exchanger with a heater.

[0002]

2. Description of the Related Art A conventional example using a plate fin heat exchanger as an evaporator is shown in FIG. (A) is a front view of a heat exchanger with fins, (B) is a side view of the same longitudinal section. Here, 31 is a plate fin, 32 is a fin collar, 34 is drain water, 3
Reference numeral 3 indicates a ventilation area. A large number of flat plate fins 31 are arranged in parallel at regular intervals, and refrigerant pipes are inserted and inserted in fin collars 32 burred on the flat plate fins 31 at regular intervals. In such a configuration, water (drain water) in which moisture in the air is condensed adheres to the flat plate fin 31 and the fin collar 32. In order to prevent the increase in ventilation resistance of the heat exchanger due to the adhesion of the drain water, the fin material is surface-treated. However, even if such a treatment is performed, drain water attached to the flat plate fins 31 and the fin collars 32 remains at the bottom of the fin collars 32 between the flat plate fins 31 and the adjacent flat plate fins as shown by 34. Since the ventilation cross-sectional area of the ventilation region 33 is narrowed, there is a problem that the ventilation resistance of the heat exchanger increases and the heat transfer characteristic of the heat exchanger deteriorates.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a heat exchanger having a low draft resistance, in which condensed water is unlikely to remain on a flat plate fin and a fin collar.

[0004]

A number of flat plate fins having fin collar portions burred at regular intervals and arranged in parallel at regular intervals, and inserted into the fin collar portions,
In a finned heat exchanger composed of a cylindrical refrigerant pipe arranged orthogonal to the flat plate fins, in the row direction (continuous in the step direction) on the surface of the flat plate fins between the fin collar portions arranged in the step direction (vertical direction). Provide a convex portion in the lateral direction.

The length of the bottom in the row direction of the projections provided on the flat plate between the fin collars and continuous in the step direction is shorter than the diameter of the refrigerant pipe.

A large number of cylindrical refrigerant pipes arranged orthogonally to the flat plate fins are arranged in a staggered pattern in the air flow direction, and the convex portions connected in the step direction are formed in one fin collar portion of the flat plate fins. It is continuously provided from a portion adjacent to the lower end to a portion adjacent to the upper end of the lower fin collar portion arranged in the step direction.

The convex portions extending in the vertical direction on the surface of the flat plate fins between the fin collars have a cross section in the column direction of the flat plate fins of V.
It is formed by bending it into a letter shape.

[0008]

In the prior art, the drain water, which has been condensed by the moisture in the air and remains between the flat plate fins in the lower part of the pipe, is formed by the convex portions in the row direction which are provided in the step direction and are provided on the surface of the flat plate fins between the fin collar portions. It will run down along with the water and prevent drain water from remaining. Since the length of the bottom in the column direction of the projections provided on the flat plate between the fin collars and connected in the step direction is shorter than the diameter of the refrigerant pipe, the drain water is naturally guided to the projections. Refrigerant pipes are arranged in a staggered arrangement in the air flow direction, and the convex portion connected in the step direction extends from the portion adjacent to the lower end of one fin collar of the flat plate fin to the lower fin collar arranged in the step direction. By continuously providing up to the portion adjacent to the upper end of the portion, the distance of drain water flowing down increases, and the flow of drain water becomes smooth. The cross section of the convex structure is V
By using a V-shaped bent structure, it is possible to obtain a convex portion that is easy to manufacture and has low flow resistance.

[0009]

The heat exchanger with fins according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of an embodiment of a heat exchanger with fins according to the present invention, FIG.
2A is a sectional view taken along line cc of FIG. 2A, and FIG. 2 is a perspective view of the flat plate fin. Here, 1 is a flat plate fin, 2 is a fin collar portion, and 3 is a convex portion provided between the fin collar portions. The flat plate fin heat exchanger is inserted in a large number of flat plate fins 1 arranged in parallel at regular intervals and a fin collar portion 2 burring on the flat plate fins 1 at regular intervals, and a large number of cylinders arranged orthogonal to the flat plate fins. Shaped refrigerant pipe.

In this embodiment, a plurality of parallel plate fins 1 arranged in parallel are arranged on the surface of the flat plate fins 1 between the fin collar portions 2 arranged in the step direction (longitudinal direction) in the row direction. The (lateral) convex portion 3 is provided.

When such a heat exchanger with fins is used as an evaporator of an outdoor unit, water (drain water) in which water in the air is condensed adheres to the surface of the flat plate fin 1 and the surface of the fin collar. The attached drain water flows down along the convex portions 3 provided between the fin collar portions 2, and the residual drain water is suppressed. Therefore, an increase in ventilation resistance due to drain water can be suppressed.

The length t of the bottom portion in the column direction of the convex portions 3 provided on the flat plate fins between the fin collar portions 2 and continuous in the stepwise direction is
Shorter than the diameter d of the refrigerant pipe. In this case, the drain water condensed on the surface of the fin collar portion 2 is naturally transmitted to the convex portion 3 and the residual drain water can be easily suppressed.

FIG. 3 is a plan view of a part of a plate fin of another embodiment of the plate fin heat exchanger according to the present invention. Here, 1 is a flat plate fin, 2 is a fin collar portion, and 3 is a convex portion provided between the fin collar portions. In this example,
As shown in FIG. 3, the arrangement of a large number of cylindrical refrigerant pipes arranged orthogonal to the flat plate fins 1, that is, the arrangement of the fin collar portions 3 is staggered with respect to the air flow direction, and is arranged in the step direction. The continuous convex portion 3 is continuously provided from a portion 2a adjacent to the lower end of one fin collar portion of the flat plate fin to a portion 2b adjacent to the upper end of the lower fin collar portion arranged in the step direction. In this case, the convex portion 3 becomes relatively long and the flow of drain water becomes smooth accordingly.

Further, as shown in FIG. 1B, a convex portion 3 which is continuous in the vertical direction on the surface of the flat plate fin between the fin collar portions 2.
Is formed by bending flat plate fins so that the cross section in the column direction is V-shaped. With such a configuration, manufacturing is easy,
The flow of drain water can also be improved.

[0015]

As described above, according to the present invention, when a finned heat exchanger is used as an evaporator of an outdoor unit in an air conditioner or the like, conventionally, moisture in the air is condensed and a pipe fin collar is used. The drain water remaining between the lower plate fins flows down along the convex portions in the row direction that are continuous in the step direction provided on the surface of the plate fin between the fin collar portions, and the residual drain water can be prevented. . Since the length of the bottom in the column direction of the projections provided on the flat plate between the fin collars and connected in the step direction is shorter than the diameter of the refrigerant pipe, the drain water is naturally guided to the projections. Refrigerant pipes are arranged in a staggered arrangement in the air flow direction, and the convex portion that is continuous in the step direction extends from the portion adjacent to the lower end of one fin collar portion of the flat plate fin to the lower fin collar that is arranged in the step direction. By continuously providing up to the portion adjacent to the upper end of the portion, the distance that drain water flows down increases, and the flow of drain water becomes smoother. The convex portion has a V-shaped cross-section, which facilitates manufacture and reduces flow resistance. In this way, residual drain water can be prevented, so the ventilation cross section surrounded by the flat plate fins and the fin collar is not narrowed by residual drain water to increase air resistance, and a heat exchanger with good heat transfer characteristics. Is obtained.

[Brief description of drawings]

FIG. 1A is a side view and FIG. 1B is a cross-sectional view of one embodiment of a heat exchanger with fins according to the present invention.

FIG. 2 is a perspective view of a flat plate fin of one embodiment of a heat exchanger with fins according to the present invention.

FIG. 3 is a plan view of a flat plate fin of another embodiment of the heat exchanger according to the present invention.

4A is a front view and FIG. 4B is a side view of a heat exchanger according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plate fin 2 Fin collar part 3 Convex part 31 Flat plate fin 32 Fin collar 33 Ventilation area 34 Drain water

Claims (4)

[Claims] 1. A plurality of flat plate fins having fin collar portions burred at regular intervals and arranged in parallel at regular intervals, and a cylindrical shape inserted into the fin collar portions and arranged orthogonal to the flat plate fins. In the heat exchanger with fins composed of the refrigerant pipe, the flat plate fins are arranged in the step direction (longitudinal direction), and the convex portions in the row direction (horizontal direction) continuous in the step direction are provided on the surface of the flat plate fins. A heat exchanger with fins. 2. The length of the bottom portion of the convex portion in the column direction is made shorter than the diameter of the refrigerant pipe.
The heat exchanger described. 3. A cylindrical refrigerant pipe arranged orthogonally to the flat plate fins is formed by inserting the fin collar parts arranged in a staggered pattern in the air flow direction, and the convex portions connected in the step direction are flat plate fins. The heat exchange according to claim 1 or 2, wherein the heat exchanger is provided from a portion adjacent to a lower end of the fin collar portion to a portion adjacent to an upper end of a lower fin collar portion arranged in a step direction. vessel. 4. The heat exchanger according to claim 1, wherein the convex portion is formed by bending a flat plate fin so that a cross section in a column direction has a V shape.