JP2006029615A - Evaporator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaporator that prevents the adhesion and frost formation of condensed water to a corrugated fin, can improve heat exchange performance, has a simple structure, and can reduce manufacturing costs. <P>SOLUTION: In the evaporator 1 in which the corrugated fin 4 is interposed between flat tubes 2 that are placed side by side and air is circulated along the corrugated fin 4, a bypass channel 9 having a partially and relatively large sectional area is formed in the corrugated fin 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an evaporator used in an automobile air conditioner or refrigerator, and more particularly to an evaporator using corrugated fins as air-side fins.

  Conventionally, in an automobile air conditioner or refrigerator, as in the case of an automobile radiator, in order to increase the heat transfer area, evaporation using corrugated fins as air side fins between each flat tube through which the refrigerant flows. The vessel is known.

  However, when corrugated fins are used in the evaporator, condensed water adheres to the corrugated fins, or the condensed water freezes and forms frost, so that the heat exchange performance of the evaporator is improved. There was a problem that it was difficult.

Therefore, conventionally, in order to solve such a problem, a gap portion is formed in the flat tube itself, and condensed water is discharged from the gap portion (for example, see Patent Document 1), or corrugated fins A surface of a synthetic resin having a hydrophilic amide group is applied to the surface so that condensed water can easily flow down (for example, see Patent Document 2).
JP 58-214783 A JP 55-12375 A

  However, the conventional evaporator provided with the above-mentioned measures for preventing the condensation water from adhering and frosting has a complicated structure, so that it takes time to manufacture and causes an increase in manufacturing cost.

  The present invention has been made to solve the above-described problems, and prevents the condensed water from adhering to the corrugated fins and frosting, can improve the heat exchange performance, has a simple structure, and has a low manufacturing cost. An object of the present invention is to provide an evaporator that can be reduced.

  The present invention is an evaporator in which corrugated fins are interposed between flat tubes arranged side by side, and air is configured to flow along the corrugated fins. A bypass passage having a relatively large cross-sectional area is formed.

  And preferably, the said bypass flow path is formed in removing the said corrugated fin over the distribution direction of air.

  Moreover, the said bypass flow path may be formed by widening the pitch of the said corrugated fin over the distribution direction of air.

  According to the present invention, most of the moisture-containing air flows in the bypass passage such as the corrugated fin removal part or the wide pitch part, and the condensed water to the corrugated fin installation part or the narrow pitch part. Adhesion and frost formation are reduced, and clogging of the air flow path as a whole can be prevented. Therefore, it is possible to improve the heat exchange performance of the evaporator.

  In addition, since the present invention only partially removes the corrugated fins or enlarges the fin pitch, the structure is simple, the manufacturing becomes easy, and the manufacturing cost can be reduced. Effects can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an evaporator 1 according to a first embodiment of the present invention will be described with reference to FIG. Here, FIG. 1 is a perspective view showing the evaporator 1 according to the present embodiment.

  The evaporator 1 has a so-called serpentine type, a flat tube 2 bent in a serpentine shape, fins 4 interposed between the straight tube portions 3 of the flat tube 2, and the flat tube 2. A cylindrical inlet-side header 5 and an outlet-side header 6 that are respectively fixed to both ends of the main body are mainly configured. The inlet-side header 5 and the outlet-side header 6 have a refrigerant introduction pipe 7 and a refrigerant discharge pipe 8 respectively. Is connected. Thus, since the evaporator 1 is formed in a serpentine type, the number of pipe connection points can be minimized, so that the manufacturing work is simplified.

  The flat tube 2 uses an extruded porous flat tube in order to reduce pressure loss when air flows between the straight pipe portions 3 and to improve the heat exchange performance of the evaporator 1. Further, in order to enhance the heat exchange performance of the evaporator 1, the corrugated fin is used as the fin 4, and the corrugated fin is brazed to the flat tube 2. Further, the fin 4 is partially removed in the air flow direction, and an air bypass passage 9 is formed between the straight pipe portions 3. It has a larger cross-sectional area than the air flow path 13 in the portion.

  Next, the operation of the evaporator 1 according to this embodiment will be described.

  The refrigerant circulates in the flat tube 2 through the inlet side header 5 from the refrigerant introduction pipe 7 and flows out from the refrigerant discharge pipe 8 through the outlet side header 6. On the other hand, the air circulates between the straight pipe portions 3 of the flat tubes 2 along the fins 4 and exchanges heat with the refrigerant flowing through the flat tubes 2. During this time, the air is cooled by heat exchange with the refrigerant, and moisture in the air gradually condenses. However, since most of the moisture-containing air circulates in the bypass flow path 9, the condensed water is present at the installation portions of the fins 4. Adhesion and frost formation are reduced, and clogging of the air flow path as a whole can be prevented. Therefore, the heat exchange performance of the evaporator 1 can be improved.

  In the above-described first embodiment, the case where the present invention is applied to the serpentine type evaporator 1 has been described. However, this is merely an example, and the present invention is, for example, as shown in FIG. The present invention can also be applied to other types of evaporators such as a parallel flow evaporator 10. And when this invention is applied to the parallel flow type | mold evaporator 10, since the bending location of a refrigerant | coolant flow path can be suppressed to the minimum, it becomes possible to suppress the pressure loss of a refrigerant | coolant.

  Next, the evaporator 11 which concerns on the 2nd Embodiment of this invention is demonstrated, referring FIG. Here, FIG. 3 is a perspective view showing the evaporator 11 according to the present embodiment. In the following description, for simplification of description, the same components as those of the evaporator 1 according to the first embodiment are denoted by the same reference numerals as those in FIG. A detailed description of the configuration is omitted.

Similarly to the evaporator 1 in the first embodiment, the evaporator 11 according to the present embodiment is also a serpentine type, and the fins 4 partially extend in the air flow direction. A wide pitch is formed, and an air bypass passage 12 is formed in a wide portion of the pitch, and the bypass passage 12 has a larger cross-sectional area than an air passage 14 in a narrow fin pitch and During the heat exchange between the refrigerant flowing through the flat tube 2 and the air flowing along the fins 4, the air is gradually cooled and moisture in the air is condensed, but contains moisture. Since most of the air flows through the bypass flow path 12, adhesion of condensed water and frost formation are reduced in the narrow pitch portion of the fins 4, thereby preventing the air flow path from being clogged as a whole. . Therefore, the heat exchange performance of the evaporator 11 can be improved.

  In the second embodiment described above, it goes without saying that the present invention can be applied to the evaporator 11 other than the serpentine type, such as a parallel flow type.

  Moreover, the formation method and the number of installation of the bypass flow paths 9 and 12 are not limited to the above case, and various changes can be made.

  Furthermore, in the first and second embodiments described above, a porous flat tube is used to circulate the refrigerant, but a flat tube having no holes on the outer surface can also be used.

It is a perspective view which shows the evaporator which concerns on the 1st Embodiment of this invention. It is a top view which shows another example of the evaporator which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the evaporator which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Flat tube 4 Fin 9 Bypass flow path 10 Evaporator 11 Evaporator 12 Bypass flow path

Claims (3)

A corrugated fin is interposed between the flat tubes arranged side by side, and an evaporator configured to allow air to flow along the corrugated fin,
An evaporator characterized in that a bypass passage having a relatively large cross-sectional area is partially formed in the corrugated fin. The evaporator according to claim 1, wherein the bypass flow path is formed by removing the corrugated fins in a flow direction of air. The evaporator according to claim 1, wherein the bypass flow path is formed by widening the pitch of the corrugated fins in the air flow direction.

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