JP2010054115A - Evaporator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaporator capable of further improving cooling performance by improving the draining performance of condensate water, and preventing the scattering of the condensate water from the evaporator. <P>SOLUTION: Corrugated fins 5 are provided with a plurality of louvers 6 cut and raised at prescribed intervals, and a downstream-side inclination angle &theta;5 to a horizontal face of a downstream-side louver 8 disposed at the downstream side with respect to an intermediate section 5a in the ventilation direction X of the louvers 6 is determined to allow the condensate water to fall down in a state that he evaporator 1 is installed, so that the condensate water generated when air is cooled at the downstream side falls down along the downstream-side louver 8, and the accumulation of the condensate water on a surface of the corrugated fins 5 can be prevented. Thus the scattering of the condensate water from the evaporator can be prevented, and cooling performance can be further improved. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an evaporator of an air conditioner, and more particularly to an evaporator having improved drainage performance of condensed water.

  Conventionally, an evaporator used in an air conditioner efficiently exchanges heat between a refrigerant and air via a corrugated fin provided therein, and cools the air flowing on the surface of the tube and the corrugated fin.

  And in this corrugated fin, the some louver cut and raised at predetermined intervals is formed along with the ventilation direction. Further, the upstream louver and the downstream louver in the ventilation direction are inclined in opposite directions with respect to the ventilation direction, and the contact area with the air is increased by the air traveling in a wave.

  As this type of evaporator, for example, one disclosed in Patent Document 1 is known.

  That is, the louver on the upstream side in the ventilation direction is inclined downward with respect to the ventilation direction, and the louver on the downstream side in the ventilation direction is inclined upward with respect to the ventilation direction. Furthermore, a substantially V-shaped valley is formed in the middle portion of the corrugated fin in the ventilation direction. That is, in this intermediate portion, the upstream louver and the downstream louver are inclined downward toward the substantially V-shaped valley bottom.

As described above, the corrugated fin is formed in a substantially V shape, and the ventilation air is cooled by the configuration in which the upstream louver and the downstream louver are inclined downward toward the substantially V-shaped valley bottom. Thus, the condensed water generated in the corrugated fins flows toward the valley bottom.
JP 2005-69669 A

  However, according to the structure of the evaporator described in Patent Document 1, on the downstream side in the ventilation direction, the condensed water falls toward the middle portion, so the direction in which the condensed water falls is opposite to the direction in which the air travels. Become. For this reason, the fall of the condensed water is prevented by the progress of the air, the condensed water becomes difficult to fall from the louver, and the condensed water may be retained on the corrugated fin surface.

  In addition, when the evaporator is installed in the air conditioner, if there is a restriction in the height direction due to the air passage layout in the air conditioner, the evaporator itself is located downstream (upward with respect to the ventilation direction). It may be installed at an angle so that it is tilted.

  In such a case, according to the structure described in Patent Document 1, the louver on the downstream side in the ventilation direction formed upward with respect to the ventilation direction is inclined with respect to the horizontal plane because the evaporator itself is inclined toward the downstream side. It becomes loose.

  Thereby, the condensed water generated on the downstream side in the ventilation direction is more difficult to flow down, and may easily stay on the corrugated fin surface.

  For this reason, when the air volume of the conditioned air is increased and changed, the staying condensed water may be scattered from the downstream end of the evaporator due to wind pressure, and the scattered condensed water is not shown in the heater for reheating the conditioned air. There is a risk that the reheating performance of the conditioned air will be deteriorated due to adhesion, and the grease for lubrication may be washed away due to adhesion to the mix door.

  Furthermore, the condensed water stays on the corrugated fin surface, so that the heat transfer area between the conditioned air and the corrugated fin is reduced, and the air passage cross-sectional area is reduced to increase the airflow resistance and the cooling performance is lowered. There is a risk of it.

  The present invention has been made in view of the above circumstances, and aims to provide an evaporator that improves the drainage performance of condensed water, prevents scattering from the evaporator, and further improves the cooling performance. is there.

  In the evaporator according to the present invention, the drainage of the condensed water is configured such that the inclination angle of the louver on the downstream side in the ventilation direction with respect to the horizontal plane is formed at an inclination angle at which the condensed water falls, with the evaporator installed. Performance can be improved.

  That is, the evaporator according to the present invention includes a refrigerant pipe portion having a refrigerant passage therein, and a plurality of the refrigerant pipe portions arranged in parallel in a direction perpendicular to the ventilation direction. And an evaporator comprising a corrugated fin provided so as to be joined to each adjacent refrigerant pipe portion by brazing or the like, wherein the corrugated fin is formed with a plurality of louvers that are cut and raised at predetermined intervals, With the evaporator installed in the ventilation path of the air conditioner, the inclination angle of the louver provided downstream from the middle part in the ventilation direction of the louver is such that the condensed water falls. It is formed at an angle.

  According to the evaporator according to the present invention configured as described above, the condensed water generated by cooling the air on the surface of the corrugated fin has a steep inclination angle with respect to the horizontal plane (the surface of the louver) with the evaporator installed. Flows down along a louver that has gravity).

  In the evaporator according to the present invention, it is preferable that the louver provided downstream from the intermediate portion in the ventilation direction is inclined downward with respect to the ventilation direction.

  According to the evaporator according to the present invention configured in this way, particularly in the downstream of the ventilation direction in which condensed water is generated and easily collected, the traveling direction in which the condensed water flows is the same as the ventilation direction. Since the condensate drainage is improved, the heat transfer area can be prevented from decreasing. Therefore, heat exchange performance is also improved, and scattering of condensed water from the end of the evaporator can be prevented.

  According to the evaporator which concerns on this invention, the drainage performance of condensed water can be improved, scattering from an evaporator can be prevented, and also the cooling performance can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the evaporator according to the invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of an evaporator 1 for explaining an embodiment of the present invention, FIG. 2 is a perspective view showing a configuration of a corrugated fin 5 of FIG. 1, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2. FIG. 4 is a perspective view showing a state in which the evaporator 1 of FIG. 1 is installed inclined with respect to the direction of gravity in the air passage, and FIG. It is BB sectional drawing of.

  As shown in FIG. 1, the evaporator 1 is arranged in a direction perpendicular to the air inlet / outlet tank 2 and the refrigerant turn side tank 3 arranged at intervals in the vertical direction of FIG. 1. And a plurality of refrigerant pipe portions 4.

  Further, the evaporator 1 is adjacent to each other in a state in which the refrigerant pipe portions 4 are arranged in parallel between the two tanks (the refrigerant inlet / outlet side tank 2 and the refrigerant turn side tank 3) in the horizontal direction in FIG. Corrugated fins 5 are provided between the matching refrigerant pipe portions 4 to be joined by brazing to the refrigerant pipe portions 4. Then, in the cooling cycle (not shown), the refrigerant that is compressed and liquefied by the compressor, condenser, and expansion valve installed upstream of the evaporator flows in the refrigerant pipe portion 4 in the vertical direction. The air that exchanges heat with the refrigerant flows in a direction perpendicular thereto, that is, in the direction of the ventilation direction X shown in FIG.

  As shown in FIG. 2, the corrugated fin 5 is formed with a plurality of louvers 6 cut and raised at predetermined intervals.

  In the present embodiment, as shown in FIG. 3, among the louvers 6, the upstream louver 7 provided on the upstream side from the intermediate portion 5 a in the ventilation direction X is upward with respect to the ventilation direction X (upstream with respect to the horizontal plane). And the downstream louver 8 provided on the downstream side from the intermediate portion 5a is inclined downward with respect to the ventilation direction X (at the downstream inclination angle θ2 with respect to the horizontal plane). In addition, as shown in FIG. 4, a case will be described in which the evaporator 1 itself is installed at an inclination angle θ3 with respect to the vertical plane so as to be tilted downstream (upward with respect to the ventilation direction X).

  As shown in FIG. 4, the evaporator 1 is installed at an inclination angle θ3 with respect to the vertical plane so as to be tilted downstream, and the downstream louver 8 provided on the downstream side in the ventilation direction X has a downstream inclination angle with respect to the horizontal plane. It is inclined at θ5 (= θ2 + θ3) and is formed at an inclination angle such that condensed water generated on the surface of the upstream louver 7 and carried by ventilation or condensed water generated downstream in the ventilation direction X falls.

  Further, the evaporator 1 is inclined, the upstream louver 7 is inclined at an upstream inclination angle θ4 (= θ1-θ3) with respect to the horizontal plane, and the downstream louver 8 is inclined with a steep inclination angle with respect to the horizontal plane ( θ5> θ4).

  In the above-described evaporator 1, the refrigerant evaporates and takes heat of vaporization while flowing through the refrigerant pipe portion 4. The corrugated fin 5 brazed to the refrigerant pipe portion 4 is also cooled and exchanges heat with the air flowing in the direction X of the ventilation direction to take heat away from the air. At this time, the air is cooled on the surface of the corrugated fins 5 to generate condensed water. According to the evaporator 1 according to the present invention configured as described above, the condensed water flows along the downstream louver 8 due to gravity. It can be prevented from flowing and falling into the gap between the downstream louvers 8 and staying on the surface of the corrugated fins 5.

  Further, in the state where the evaporator 1 is installed, the downstream side louver 8 is formed so that the downstream side inclination angle θ5 with respect to the horizontal plane is such that the condensed water falls. As in the corrugated fin described in 1, the drainage performance can be secured with a straight shape as shown in FIG. For this reason, the shape of the corrugated fin 5 can prevent the air flow from being obstructed, and a rectifying effect can be obtained.

  Further, since the downstream louver 8 is formed to be inclined downward with respect to the ventilation direction X on the downstream side of the ventilation direction X in which the generation of condensed water is likely to occur, the condensed water is not only caused by gravity but also by the flow of air. The drainage performance can be further improved.

  Thus, when the drainage performance of condensed water can be improved and the condensed water can be prevented from staying on the surface of the corrugated fins 5, the remaining condensed water is removed when the air volume is changed. Preventing splashing from 1 and preventing the scattered condensed water from adhering to the heater, etc., and reducing the reheating performance of the conditioned air, or from adhering to the mix door and washing away the lubricating grease. Can do.

  And since condensed water does not stay on the surface of corrugated fin 5, the reduction of the heat transfer area between air and corrugated fin 5 can be prevented. Furthermore, the cross-sectional area of the air passage is not reduced, and the air easily flows. By these things, the cooling performance can be improved.

  Further, in a state where the evaporator 1 is installed, the downstream side louver 8 where the condensed water is likely to be generated has a steeper inclination angle θ5 with respect to the horizontal plane than the upstream side inclination angle θ4 of the upstream louver 7 with respect to the horizontal plane. Therefore (θ5> θ4), the drainage performance is further improved, and the generated condensed water is easily washed away by the inclination.

  In the state where the evaporator 1 is installed, it is only necessary that the downstream louver 8 is inclined at a steeper angle with respect to the horizontal plane than the upstream louver 7 (θ5 = θ2 + θ3> θ4 = θ1-θ3).

  That is, when the evaporator 1 itself is tilted so as to be tilted downstream as in this embodiment, the downstream tilt angle θ2 with respect to the horizontal plane is the upstream tilt angle with respect to the horizontal plane before the evaporator 1 is tilted. It is not necessary to be larger than θ1.

  Therefore, in FIG. 3, the relationship between the upstream inclination angle θ1 with respect to the horizontal plane of the upstream louver 7 and the downstream inclination angle θ2 with respect to the horizontal plane of the downstream louver 8 before tilting the evaporator 1 is limited to the case where θ1 <θ2. However, it may be the case of θ1 ≦ θ2 or the case of θ1 ≧ θ2.

  For example, in the case of θ1 = θ2, when the upstream louver 7 and the downstream louver 8 are cut and raised in the corrugated fin 5, it is not necessary to change the inclination angle that is raised and lowered between the upstream side and the downstream side. The manufacturing work can be facilitated.

  In particular, when θ1 = θ2 as described above, as described in Patent Document 1, the upstream louver is inclined downward with respect to the ventilation direction, and the downstream louver is inclined upward with respect to the ventilation direction. It is also possible to use an existing corrugated fin as formed.

  In other words, when the plurality of corrugated fins 5 are brazed in parallel in the left-right direction of the evaporator 1, the upstream louver 7 is formed by brazing the corrugated fins 5 in the opposite vertical direction. It can be formed so as to be inclined upward with respect to the ventilation direction X and the downstream louver 8 is inclined downward with respect to the ventilation direction X.

  Thus, since the existing corrugated fin 5 can be used simply by reversing the vertical direction when brazing, the manufacturing cost can be reduced.

  Further, when the downstream louver 8 is inclined downward with respect to the ventilation direction X as in this embodiment, the downstream inclination angle of the downstream louver 8 with respect to the horizontal plane with the evaporator 1 installed. θ5 is preferably 5 degrees or more.

  By setting such an inclination angle, the condensed water easily falls, but in order to further promote the falling of the condensed water, the downstream side inclination angle θ5 with respect to the horizontal plane is preferably a steeper angle.

  In addition, in this embodiment, although the case where the evaporator 1 was inclined and installed so that it might fall down, the evaporator which concerns on this invention is not limited to this aspect, The ventilation direction downstream louver, If the inclination angle with respect to the horizontal plane is formed so that the condensed water falls, the evaporator itself may not be inclined.

  Moreover, although the case where the downstream louver 8 is inclined downward with respect to the ventilation direction X has been described in the present embodiment, the evaporator according to the present invention is not limited to this mode.

  For example, the structure of the corrugated fin 105 as shown in FIG. 6 may be used. As shown in FIG. 6, the upstream louver 107 is inclined downward with respect to the ventilation direction X ′, and the downstream louver 108 is inclined upward with respect to the ventilation direction X ′. Further, the downstream inclination angle θ105 with respect to the horizontal plane is steeper than the upstream inclination angle θ104 with respect to the horizontal plane (θ105> θ104).

  Further, in the present embodiment, the case where the inclination direction of the upstream louver 7 and the inclination direction of the downstream louver 8 are opposite directions has been described, but the evaporator according to the present invention is limited to this aspect. is not.

  For example, the structure of the corrugated fins 205 and 305 as shown in FIGS. As shown in FIG. 7, the upstream louver 207 is inclined downward with respect to the ventilation direction X ″, and the downstream louver 208 is also inclined downward with respect to the ventilation direction X ″. Further, the downstream inclination angle θ205 with respect to the horizontal plane is steeper than the upstream inclination angle θ204 with respect to the horizontal plane (θ205> θ204).

  As shown in FIG. 8, the upstream louver 307 is inclined upward with respect to the ventilation direction X ′ ″, and the downstream louver 308 is also inclined upward with respect to the ventilation direction X ′ ″. ing. Further, the downstream side inclination angle θ305 with respect to the horizontal plane is steeper than the upstream side inclination angle θ304 with respect to the horizontal plane (θ305> θ304).

  Further, as shown in FIGS. 6 and 8, when the downstream louvers 108, 308 are upward with respect to the ventilation direction X ′, X ′ ″, the downstream louvers 108, The downstream inclination angles θ105 and θ305 of 308 with respect to the horizontal plane are preferably 8 degrees or more.

  By setting such an inclination angle, the condensed water easily falls, but in order to further promote the falling of the condensed water, the downstream side inclination angles θ105 and θ305 with respect to the horizontal plane should be steeper angles. Good.

1 is a perspective view showing an overall configuration of an evaporator 1 for explaining an embodiment of the present invention. It is a perspective view which shows the structure of the corrugated fin 5 of FIG. It is the sectional view on the AA line of FIG. It is a perspective view which shows the state in which the evaporator 1 of FIG. 1 is installed inclining. It is the BB sectional view taken on the line of FIG. It is a perspective view which shows the structure of the corrugated fin 105 for demonstrating other embodiment of this invention. It is a perspective view which shows the structure of the corrugated fin 205 for demonstrating other embodiment of this invention. It is a perspective view which shows the structure of the corrugated fin 305 for demonstrating other embodiment of this invention.

Explanation of symbols

5 Corrugated fin 5a Middle part
6 Louver 7 Upstream louver 8 Downstream louver X Ventilation direction θ1 Upstream inclination angle with respect to horizontal plane θ2 Downstream inclination angle with respect to horizontal plane

Claims (6)

A refrigerant pipe portion having a refrigerant passage therein;
Corrugated fins provided between the adjacent refrigerant pipe portions so as to be joined to the adjacent refrigerant pipe portions in a state where a plurality of the refrigerant pipe portions are installed in parallel in a direction perpendicular to the ventilation direction. In the evaporator of the air conditioner comprising:
The corrugated fin is formed with a plurality of louvers that are cut and raised at predetermined intervals, and is provided downstream from an intermediate portion in the ventilation direction of the louver in a state where the evaporator is installed in the ventilation path of the air conditioner. An evaporator, wherein an inclination angle of the louver formed with respect to a horizontal plane is formed such that condensed water falls.   The evaporator according to claim 1, wherein the louver provided downstream from an intermediate portion in the ventilation direction is inclined downward with respect to the ventilation direction.   The evaporator according to claim 1, wherein the louver provided downstream from an intermediate portion in the ventilation direction is inclined upward with respect to the ventilation direction. The louver provided on the upstream side in the ventilation direction and the louver provided on the downstream side in the ventilation direction are both inclined from the horizontal,
In the state where the evaporator is installed, the inclination angle of the louver provided on the downstream side with respect to the horizontal plane is formed to be steeper than the inclination angle of the louver provided on the upstream side with respect to the horizontal plane. The evaporator according to claim 1, wherein the evaporator is characterized by the above.   In a state where the evaporator is installed, when the louver provided on the downstream side from the intermediate portion in the ventilation direction is inclined downward with respect to the ventilation direction, the inclination angle with respect to the horizontal plane is 5 degrees or more. The evaporator according to claim 4, wherein the evaporator is provided.   In a state where the evaporator is installed, when the louver provided on the downstream side from the middle part in the ventilation direction is inclined upward with respect to the ventilation direction, the inclination angle with respect to the horizontal plane is 8 degrees or more. The evaporator according to claim 4, wherein the evaporator is provided.

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