JP2015090244A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of discharging condensation water in a comparatively short time.SOLUTION: A corrugate fin 15 of an evaporator includes a wave crest part 17, a wave trough part 18, and a connection part 19 connecting the wave crest part 17 and the wave trough part 18. A plurality of cuts extended in a width direction of the connection part 19 are provided in the connection part 19 at intervals along a ventilation direction, and a belt-like portion between the adjacent cuts is bent to be tilted to the connection part 19, and thus, a plurality of louvers 21 are formed. Longitudinal both ends of the louver 21 are connected to the connection part 19 through upper and lower both side plastic deformation parts 22 and 23. A shape of cut end edges 22a and 23a of the upper and lower both side plastic deformation parts 22 and 23 is an arc shape curved to be protruded to a width direction center side of the connection part 19 in an intermediate portion when viewed from the ventilation direction.

Description

  The present invention relates to an evaporator suitably used for a car air conditioner that is a refrigeration cycle mounted on an automobile.

  In this specification and claims, the top and bottom of FIGS. 1 and 3 to 6 are referred to as top and bottom.

  As an evaporator used in a car air conditioner, a plurality of flat refrigerant flow pipes whose longitudinal direction faces the vertical direction and whose width direction faces the ventilation direction are arranged in parallel at intervals in the thickness direction of the refrigerant flow pipe, It is widely known that a ventilation gap is formed between adjacent refrigerant circulation pipes, and corrugated fins are arranged in at least some of the ventilation gaps.

  As shown in FIG. 8, the corrugated fin (30) used in the above-described evaporator includes a wave crest (31) extending in the ventilation direction, a wave bottom (32) extending in the ventilation direction, and a wave crest (31) and a wave bottom. (32) and a plurality of louvers (34) whose longitudinal direction is in the width direction of the connecting portion (33) are arranged side by side in the ventilation direction. The louver (34) has a plurality of cuts extending in the width direction of the connecting part (33) in the connecting part (33) at intervals in the wind direction, and a band-like portion between adjacent cuts is connected to the connecting part (33). (33) is formed by bending so as to be inclined with respect to the longitudinal direction of both ends of the louver (34) via the plastic deformation portions (35) and (36) protruding on the upper and lower sides of the connecting portion (33). It is connected to the connecting portion (33) of the corrugated fin (30), and the shape of the cut edge (35a) facing the cut in the upper plastic deformation portion (35) is, As seen from the ventilation direction, it is a straight line inclined upward in the width direction central portion side of the connecting portion (33) of the louver (34), and also faced the cut in the lower plastic deformation portion (36). The shape of the cutting edge (36a) is a straight line inclined downward toward the center in the width direction of the connecting portion (33) as seen from the ventilation direction, and the upper plastic deformation portion (35) and the lower plasticity The distance between the cutting edge (35a) (36a) of the deformed portion (36) and the connecting portion (33) of the corrugated fin (30) is such that the louver (34) extends from the crest (31) and the wave bottom (32) side. One that gradually increases toward the longitudinal center is known (see Patent Document 1).

  Normally, an evaporator constitutes a refrigeration cycle together with a compressor, a condenser as a refrigerant cooler, an expansion valve as a decompressor, and the like, and is mounted on a vehicle, for example, an automobile, as a car air conditioner. In such a car air conditioner, condensed water is generated on the surface of the corrugated fin of the evaporator during the operation of the compressor, resulting in a decrease in heat exchange performance or condensation when the air flow is switched from a low air flow to a high air flow. Since water may be scattered, it is necessary to improve the drainage of condensed water.

  In the case of the evaporator using the corrugated fin (30) described in Patent Document 1, the condensed water generated on the surface of the corrugated fin (30) flows downward between the adjacent louvers (34) while flowing to the leeward side by the wind. Although drained, the shape of the cutting edge (35a) that faced the cut in the upper plastic deformation portion (35) is the upward direction of the connecting portion (33) of the louver (34) as viewed from the ventilation direction. The shape of the cut edge (36a) facing the cut in the lower plastic deformation part (36) is connected downward as seen from the ventilation direction. Since it is a straight line inclined toward the center in the width direction of the portion (33), a relatively long time is required until the condensed water generated on the surface of the corrugated fin (30) is drained downward.

Japanese Patent No. 3775302

  An object of the present invention is to provide an evaporator that meets the above requirements and can drain condensed water generated on the surface of a corrugated fin in a relatively short time.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A plurality of flat refrigerant flow pipes whose longitudinal direction faces the up-down direction and whose width direction faces the ventilation direction are arranged in parallel at intervals in the thickness direction of the refrigerant flow pipe, and adjacent refrigerant flow pipes Ventilation gaps are formed in between, and at least a part of all the ventilation gaps, a wave crest extending in the ventilation direction, a wave bottom extending in the ventilation direction, and a connecting portion connecting the wave crest and the wave bottom. The corrugated fins are arranged, and a plurality of louvers whose longitudinal direction is oriented in the width direction of the connecting portion are formed side by side in the ventilation direction at the connecting portion of the corrugated fin, and the louver extends in the width direction of the connecting portion. Formed by bending a plurality of cuts at intervals in the wind direction and bending a band-like portion between adjacent cuts so as to incline with respect to the connecting part, and both longitudinal ends of the louver are connected to the connecting part A evaporator which is connected to the connecting portion of the corrugated fin via a plastically deformed portion which protrudes on both upper and lower sides,
The shape of the cutting edge facing the cut in the upper plastic deformation portion and the lower plastic deformation portion is curved so that the intermediate portion protrudes toward the width direction central portion side of the connecting portion of the corrugated fin when viewed from the ventilation direction. An evaporator that has a circular arc shape.

  2) When the fin height of the corrugated fin is Hmm, the louver length is L1mm, the thickness of the corrugated fin is Tmm, and the dimension in the connecting portion width direction of the cutting edge is L2mm, 0.8 × H ≦ L1, L2 The evaporator according to 1) above, wherein ≧ T.

  According to the evaporator of the above 1) and 2), the shape of the cutting edge facing the cut in the upper plastic deformation portion and the lower plastic deformation portion connecting the longitudinal ends of the louver to the connecting portion of the corrugated fin is When the evaporator is installed in a car air conditioner, the corrugation is activated when the compressor is operated because the middle part is an arcuate shape so that the middle part protrudes toward the center part in the width direction of the connecting part of the corrugated fin. Condensed water generated on the surface of the fin flows toward the lower side of the upper plastic deformation portion and flows toward the upper side of the lower plastic deformation portion due to surface tension. Accordingly, the water is drained downward through the adjacent louvers in a relatively short time.

  That is, even when a large amount of condensed water is generated, the condensed water generated on the surface of the corrugated fin is relatively short between adjacent louvers due to the surface tension of the arcuate portion that is curved so as to protrude toward the center in the width direction. It is drained down through.

  According to the evaporator of the above 2), since the length of the louver can be set relatively long, it is possible to improve the heat exchange performance while maintaining the drainage.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to the present invention. It is a perspective view which expands and shows a part of corrugated fin used for the evaporator of FIG. It is a cross-sectional view which expands and shows a part of corrugated fin used for the evaporator of FIG. It is a figure corresponded to a part of AA line cross section of FIG. It is a figure corresponded to a part of BB line cross section of FIG. It is a principal part enlarged view of FIG. It is a graph which shows the relationship between the amount of water retention and time in the corrugated fin used for the evaporator of this invention, and the corrugated fin of patent document 1. FIG. 3 is a view corresponding to FIG. 2 showing a corrugated fin used in an evaporator described in Patent Document 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIG. 1) is the front, and the opposite side is the rear. In addition, the left and right when viewing the rear from the front, that is, the left and right in FIGS.

  Furthermore, in the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the overall configuration of an evaporator according to the present invention, and FIGS. 2 to 6 show the configuration of the main part thereof.

  In FIG. 1, the evaporator (1) is composed of an aluminum upper header tank (2) and an aluminum lower header tank (3) which are spaced apart in the vertical direction with the longitudinal direction directed to the left and right direction. And a heat exchange core section (4) provided between the header tanks (2) and (3).

  The upper header tank (2) is integrated with the leeward upper header part (5) located on the front side (downstream side of the ventilation direction) and the rear side (upstream side of the ventilation direction) and integrated with the leeward side upper header part (5) And a windward upper header section (6). A refrigerant inlet (7) is provided at the right end of the leeward upper header (5), and a refrigerant outlet (8) is provided at the right end of the leeward upper header (6). The lower header tank (3) includes a leeward lower header portion (9) located on the front side, and an upwind lower header portion (11) located on the rear side and integrated with the leeward lower header portion (9). It has.

  The heat exchange core (4) has a plurality of extruded aluminum flat refrigerant flow pipes (12) in the left-right direction whose longitudinal direction faces the vertical direction and whose width direction faces the ventilation direction (front-rear direction). They are arranged in parallel at intervals. Here, a plurality of sets (13) consisting of two refrigerant flow pipes (12) arranged at intervals in the front-rear direction are arranged at intervals in the left-right direction, and the front and rear refrigerant flow pipes (12) A ventilation gap (14) through which air is passed is formed between adjacent members of the set (13). The upper end of the leeward refrigerant circulation pipe (12) is connected to the leeward upper header (5), and the lower end is connected to the leeward lower header (9). The upper end portion of the windward side refrigerant circulation pipe (12) is connected to the windward upper header portion (6), and the lower end portion thereof is connected to the windward lower header portion (11). Then, the refrigerant passes through the refrigerant inlet (7) and enters the leeward upper header portion (5) of the evaporator (1), passes through the entire refrigerant flow pipe (12), and flows into the leeward upper header portion (6). It flows out from the outlet (8).

  Corrugated fins (15) each made of an aluminum brazing sheet are arranged outside the entire ventilation gap (14) of the heat exchange core (4) and the pipe assembly (13) of the refrigerant flow pipes (12) at both left and right ends. The front and rear refrigerant flow pipes (12) constituting the pipe assembly (13) are brazed. In addition, aluminum side plates (16) are disposed outside the corrugated fins (15) at the left and right ends, and are brazed to the corrugated fins (15). A ventilation gap (14) is also provided between the pipe assemblies (13) at the left and right ends and the side plate (16).

  As shown in FIGS. 2 to 6, the corrugated fin (15) includes a wave crest (17) extending in the front-rear direction, a wave bottom (18) extending in the front-rear direction, and a wave crest (17) and a wave bottom (18). A plurality of louvers (21) lined up in the ventilation direction in the connecting portion (19) with the longitudinal direction oriented in the width direction (left-right direction) of the connecting portion (19). Is formed. The louver (21) allows a plurality of cuts extending in the width direction of the connecting part (19) to be inserted into the connecting part (19) at intervals in the wind direction, and a band-like part between adjacent cuts is inserted into the band-like part. It is formed by bending around the center line in the width direction so as to incline with respect to the connecting portion (19), and both longitudinal ends (left and right end portions) of the louver (21) are connected to the connecting portion ( It is connected to the connecting part (19) via plastic deformation parts (22) and (23) protruding on both upper and lower sides of 19). Accordingly, both side edge portions (21a) extending in the longitudinal direction of the louver (21) are cut end edges facing the cut and are linear.

  The cutting edge (22a) (23a) facing the cut in the upper plastic deformation part (22) and the lower plastic deformation part (23) connecting the longitudinal ends of the louver (21) to the connecting part (19). The shape is an arc shape that is curved so that the intermediate portion protrudes toward the center in the width direction of the connecting portion (19) of the corrugated fin when viewed from the ventilation direction, and the cutting edge (22a) (23a) and the corrugated fin The interval between the connection portion (19) of (15) is gradually increased from the refrigerant flow pipe (12) side (the crest portion (17) and the wave bottom portion (18) side) toward the longitudinal center portion of the louver (21). Is getting bigger. The arcuate portions of the cut edges (22a) and (23a) are indicated by (27) and (28).

  Here, the fin height of the corrugated fin (15) is Hmm, the length of the louver (21) is L1mm, the thickness of the corrugated fin (15) is Tmm, the upper plastic deformation portion (22) and the lower plastic deformation portion ( 23) When the arcuate portions at the cutting edges (22a) and (23a) are set to L2 mm in the horizontal direction of (27) and (28), the relationship is 0.8 × H ≦ L1 and L2 ≧ T. Preferably it is.

  In addition, four louver groups (24A) (24B) including a plurality of louvers (21) are provided in the connecting portion (19) of the corrugated fin (15) at intervals in the front-rear direction. The louver (21) of the front louver group (24A) from the front end and the louver (21) of the second louver group (24B) from the front is rearward. The second louver group (24A) (24B) from the front end and the front is provided at a position corresponding to the front refrigerant flow pipe (12), and the third and rear louvers from the front The groups (24A) and (24B) are provided at positions corresponding to the rear refrigerant flow pipe (12). The front part of the front end and the front end louver (21) of the third louver group (24A) from the front is located in front of the front end cut when forming the louvers (21) of both louver groups (24A). There is an inclined piece (25A) formed by bending upward so as to incline with respect to the connecting portion (19), and both the rear end louvers (21) of these louver groups (24A) Formed by bending the rear part of the louver (21) of the louver group (24A) to the lower side so as to incline with respect to the connecting part (19) than the cut at the rear end. There is an inclined piece (25B). In addition, the front end louver (24B) of the second and rear end louver group (24B) is more forward than the front end louver (21) than the front end cut formed when forming the louvers (21) of both louver groups (24B). There is an inclined piece (26A) formed by bending the front portion downward so as to be inclined with respect to the connecting portion (19), and the rear end louvers (21) of these louver groups (24A) are rearward. By bending the rear part of the louver (21) of both louver groups (24B) on the side from the rear end cut, so as to incline with respect to the connecting part (19). There is an inclined piece (26B) formed.

  The above-described evaporator (1) includes a compressor that uses a vehicle engine as a drive source, a condenser that cools the refrigerant discharged from the compressor (refrigerant cooler), and an expansion valve that reduces the refrigerant that has passed through the condenser (decompressor). The refrigeration cycle is configured together with these components and is installed in automobiles as car air conditioners. When the compressor is in operation, the low-pressure gas-liquid mixed phase two-phase refrigerant compressed by the compressor and passed through the condenser and the expansion valve passes through the refrigerant inlet (7) and enters the evaporator (1). It enters into the leeward upper header part (5), flows out from the refrigerant outlet (8) of the leeward upper header part (6) through the entire refrigerant circulation pipe (12). Then, while the refrigerant flows through the refrigerant flow pipe (12), heat exchange is performed with the air passing through the ventilation gap (14), and the refrigerant flows out as a gas phase.

  At this time, it is cooled by the refrigerant flowing in the refrigerant flow pipe (12), and condensed water is generated on the surface of the corrugated fin (15). Condensed water generated on the surface of the corrugated fin (15) flows to the lower side of the upper plastic deformation part (22) due to surface tension while flowing to the leeward side by the wind, and at the upper side of the lower plastic deformation part (23). As a result, the water is drained downward in a relatively short time through the adjacent louvers (21).

  Next, the relationship between the water retention amount and time in the corrugated fin (15) (the product of the present invention) used in the evaporator (1) of the above embodiment and the corrugated fin (30) (compared product) shown in FIG. Examined. That is, the evaporator (1) was immersed in the water in the water tank to remove the air remaining in the evaporator (1) and then left for 30 minutes. Subsequently, the evaporator (1) was lifted out of the water, and in this state, the weight of the combination was measured to examine the change in the water retention amount.

  The result is shown in FIG. As is clear from FIG. 7, the water retention amount of the corrugated fin (15) used in the evaporator (1) of the above embodiment decreases rapidly in a relatively short time, whereas the corrugated fin shown in FIG. It can be seen that the water retention amount of (30) gradually decreases over a relatively long time.

  In the above embodiment, the corrugated fins (15) are disposed in all the ventilation gaps (14) of the evaporator (1), but the present invention is not limited to this, and a part of the entire ventilation gap (14). The cool storage material container in which the cool storage material is sealed in the plurality of ventilation gaps (14) may be disposed, and the corrugated fins (15) may be disposed in the remaining ventilation gaps (14). In this case, cold energy is stored in the regenerator material in the regenerator container during operation of the compressor, and the vehicle uses the cold energy stored in the regenerator material in the regenerator material container when the engine stops and the compressor stops. The room can be cooled.

  In the above embodiment, the upper and lower header tanks (2) and (3) are connected to the refrigerant flow pipe (12) made separately from the upper and lower header tanks (2) and (3). The evaporator is formed by arranging a plurality of flat hollow bodies formed by brazing the peripheral portions with a pair of plate-shaped plates facing each other, and the leeward side upper header portion arranged side by side in the front-rear direction and A plurality of refrigerants that communicate the upwind header section, the leeward lower header section and the upwind lower header section that are disposed below both header sections, and the refrigerant inlet header section and the leeward lower header section. A so-called laminate having a circulation pipe, a plurality of refrigerant circulation pipes that communicate the upwind header section and the upwind header section, and corrugated fins arranged between adjacent refrigerant circulation pipes. It can also be applied to a type evaporator.

  The evaporator according to the present invention is suitably used in a refrigeration cycle constituting a car air conditioner of a vehicle.

(1): Evaporator
(12): Refrigerant distribution pipe
(14): Ventilation gap
(15): Corrugated fin
(17): Wave peak
(18): Wave bottom
(19): Connection part
(21): Louva
(21a): Straight side edges
(22): Upper plastic deformation part
(22a): Cutting edge
(23): Lower plastic deformation part
(23a): Cutting edge
(27) (28): Arc-shaped part

Claims (2)

A plurality of flat refrigerant flow pipes whose longitudinal direction faces the up-down direction and whose width direction faces the ventilation direction are arranged in parallel at intervals in the thickness direction of the refrigerant flow pipe, and between adjacent refrigerant flow pipes Ventilation gaps are formed, and at least some of the ventilation gaps include a wave crest extending in the ventilation direction, a wave bottom extending in the ventilation direction, and a connecting portion connecting the wave crest and the wave bottom. Corrugated fins are arranged, and a plurality of louvers whose longitudinal direction is directed in the width direction of the connecting portions are formed side by side in the ventilation direction at the connecting portions of the corrugated fins, and the louvers extend in the width direction of the connecting portions. The slits are formed by passing the slits in the airflow direction and bending the belt-like portions between the adjacent slits so as to incline with respect to the connecting part. A evaporator which is connected to the connecting portion of the corrugated fin via a plastically deformed portion which protrudes down both sides,
The shape of the cutting edge facing the cut in the upper plastic deformation portion and the lower plastic deformation portion is curved so that the intermediate portion protrudes toward the width direction central portion side of the connecting portion of the corrugated fin when viewed from the ventilation direction. An evaporator that has a circular arc shape. When the corrugated fin height is Hmm, the louver length is L1mm, the corrugated fin thickness is Tmm, and the dimension of the cut edge in the connecting portion width direction is L2mm, 0.8 × H ≦ L1, L2 ≧ T The evaporator according to claim 1 which becomes the relation.

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