JP2014020609A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of extending a cooling time, and restraining dispersion of condensed water.SOLUTION: An evaporator 1 has corrugated fins 17 arranged in a ventilation clearance 15 formed between adjacent refrigerant flow pipes 13. The corrugated fin 17 comprises: a fin body 19 brazed to the refrigerant flow pipes 13; and an outward extension part 21 extending more forward than the refrigerant flow pipes 13. All of gaps formed between the outward extension parts 21 of the two corrugated fins 17 arranged in the adjacent ventilation gaps 15 of the evaporator 1 serve as water holding gaps 22 for holding condensed water or water exhausting gaps 23 for exhausting the condensed water. The water holding gaps 22 and the water exhausting gaps 23 are alternately provided. A drainage member 24 extending in an upward and downward direction is arranged in the water exhausting gaps 23, and is brought into contact with the outward extension parts 21 of the fins 17 on both sides.

Description

  The present invention relates to an evaporator used in a car air conditioner for a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

  In this specification and claims, the top and bottom of FIG.

  In recent years, automobiles have been proposed that automatically stop the engine when the vehicle stops, such as when waiting for a signal, for the purpose of environmental protection or improvement in automobile fuel efficiency.

  By the way, in a normal car air conditioner, when the engine is stopped, the compressor using the engine as a driving source stops, so that the refrigerant is not supplied to the evaporator, and the cooling capacity is rapidly reduced.

  Therefore, in order to solve such a problem, the evaporator is provided with a cold storage function, and when the engine stops and the compressor stops, the interior of the vehicle can be cooled using the cold energy stored in the evaporator. It is considered.

  As an evaporator, the present applicant has previously arranged a plurality of flat refrigerant flow pipes whose longitudinal direction faces the up-down direction and whose width direction faces the ventilation direction, spaced apart in the thickness direction of the refrigerant flow pipe, Ventilation gaps are formed between adjacent refrigerant flow pipes, and a cool storage material container in which a cool storage material is sealed in a plurality of ventilation gaps in a part of all the ventilation gaps is disposed, and fins are provided in the remaining ventilation gaps. The container body portion disposed and the cold storage material container is joined to the refrigerant flow pipe, and the outward projecting portion provided to extend to the leeward side of the container main body section and to be bulged to the leeward side of the refrigerant flow pipe And a fin main body part joined to the refrigerant flow pipe, and an outward projecting part provided so as to extend to the leeward side edge of the fin main body part and overhang the leeward side of the refrigerant flow pipe. A cool storage container Fins are respectively arranged in the ventilation gaps on both sides of the arranged ventilation gap, and are provided with a fin set composed of two fins arranged in adjacent ventilation gaps, and outwardly projecting of the two fins constituting the fin set There has been proposed an evaporator with a cold storage function in which spacers are arranged between the parts and the spacers are brazed to the outwardly projecting parts of both fins (see Patent Document 1).

  According to the evaporator described in Patent Document 1, during normal cooling when the compressor is operating, the cold heat of the refrigerant flowing in the refrigerant circulation pipe is transmitted to the cold storage material in the cold storage material container and stored in the cold storage material, and compressed. When the machine stops, cold heat stored in the cold storage material in the cold storage material container is transmitted to the fins arranged in the ventilation gap through the refrigerant circulation pipe in which the cold storage material container is in thermal contact, It is designed to cool down to the air flowing through the ventilation gap from the fins, and when the engine stops and the compressor stops, it is possible to cool the passenger compartment using the cold heat stored in the evaporator Thus, a rapid decrease in the cooling capacity when the engine is stopped is suppressed.

  However, the evaporator with a cool storage function described in Patent Document 1 requires a cool storage material container and a cool storage material. And since the cool storage material container by which the cool storage material was enclosed in some ventilation gaps among all the ventilation gaps is arrange | positioned, the ventilation resistance at the time of the normal air_conditioning | cooling which the compressor is operating becomes large.

JP 2012-42167 A

  The object of the present invention is to solve the above-mentioned problem and to reduce the cost as compared with the evaporator with a cold storage function described in Patent Document 1 and to reduce the ventilation resistance during normal cooling when the compressor is operating. Another object of the present invention is to provide an evaporator that can suppress a decrease in cooling capacity when the engine is stopped.

  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 In an evaporator in which a ventilation gap is formed between and a fin is arranged in the ventilation gap,
The fin includes a fin main body part joined to the refrigerant flow pipe, and an outward projecting part that is connected to the leeward side edge of the fin main body part and extends to the leeward side of the refrigerant flow pipe. All the gaps formed between the outwardly projecting portions of the two fins arranged in the ventilation gap are water holding gaps for holding condensed water or water discharge gaps for discharging condensed water, The holding gaps and the water discharge gaps are alternately arranged, drainage members extending in the vertical direction are disposed in the water discharge gaps, and the drainage members are outwardly projecting portions of the fins forming the water discharge gaps. Evaporator in contact with

  2) The evaporator according to 1) above, wherein the drainage member and the outward projecting portion of the fin are brazed.

  3) The evaporator according to 1) or 2) above, wherein a protruding width from the refrigerant flow pipe at the outwardly protruding portion of the fin is 2 to 7 mm.

  According to the evaporators 1) to 3) above, the fins arranged in the ventilation gap are connected to the fin main body part joined to the refrigerant flow pipe, the leeward side edge of the fin main body part, and more than the refrigerant flow pipe. All the gaps formed between the outwardly extending portions of the two fins disposed in the adjacent ventilation gaps hold condensed water, with the outwardly extending portion provided so as to protrude toward the leeward side. It is a water holding gap or a water discharging gap that discharges condensed water, and the water holding gap and the water discharging gap are alternately arranged, and a drainage member extending in the vertical direction is arranged in the water discharging gap. Since the drainage member is in contact with the outwardly protruding portions of the fins on both sides forming the water discharge gap, the condensed water generated on the surface of the fin is held in the water holding gap while the compressor is operating. The And when the engine stops and the compressor stops, when the cold water as the sensible heat of the condensed water held in the water holding gap or the condensed water is frozen in the water holding gap, The cooling heat as latent heat of frozen condensed water and the cooling heat as sensible heat of the condensed condensed water are cooled to the air flowing through the ventilation gap, so that the cooling time can be extended and the cooling capacity Can be suppressed for a longer time.

  Also, the condensate generated on the surface of the fin during the operation of the compressor that cannot be held in the water holding gap is transferred to the drainage member disposed in the water discharge gap from the outwardly protruding portion of the fin. Since it is transmitted and flows downward along the drainage member, the condensed water can be prevented from being scattered.

  According to the evaporator 3), the condensed water generated on the surface of the fin can be effectively held in the water holding gap while the compressor is operating.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to the present invention. It is an AA line expanded sectional view of FIG.

  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 FIGS. 1 and 2) is the front, and the opposite side is the rear. Further, the left and right when viewing the rear from the front, that is, the left and right in FIG.

  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 FIG. 2 shows the configuration of the main part thereof.

  In FIG. 1, the evaporator (1) includes an aluminum first header tank (2) and an aluminum second header tank (3) extending in the horizontal direction and spaced apart in the vertical direction, and both header tanks (2 ) (3) and a heat exchange core part (4) provided between them.

  The first header tank (2) is located on the leeward upper header part (5) located on the front side (downstream side in the ventilation direction) and on the leeward side upper header part (5) located on the rear side (upstream side in the ventilation direction). And an integrated upwind 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 second 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). And. The leeward lower header portion (9) and the leeward lower header portion (11) of the second header tank (3) are joined across the right end portions of the lower header portions (9) and (11), and The inside is communicated via a communication member (12) that forms a passage.

  As shown in FIGS. 1 and 2, the heat exchange core (4) has a flat refrigerant made of a plurality of extruded aluminum shapes whose longitudinal direction faces the vertical direction and whose width direction faces the ventilation direction (front-rear direction). The flow pipes (13) are arranged in parallel in the left-right direction (thickness direction of the refrigerant flow pipe (13)). Here, the heat exchange core section (4) includes a plurality of pipe sets (14) including two refrigerant flow pipes (13) arranged at intervals in the front-rear direction, and the plurality of pipe sets (14) Are arranged at intervals in the left-right direction, and a ventilation gap (15) is formed between adjacent pipe assemblies (14) in the left-right direction. An upper end portion of the front refrigerant flow pipe (13) is connected to the leeward upper header portion (5), and a lower end portion thereof is connected to the leeward lower header portion (9). Further, the upper end portion of the rear refrigerant flow pipe (13) is connected to the windward upper header portion (6), and the lower end portion thereof is connected to the windward lower header portion (11).

  The air exchange gap (15) of the heat exchange core part (4) is made of an aluminum brazing sheet having a brazing filler metal layer on both sides, and has a wave crest extending in the front-rear direction, a wave bottom extending in the front-rear direction, and a wave crest and a wave bottom. A corrugated outer fin (17) composed of a connecting portion for connecting the two is disposed so as to straddle the front and rear refrigerant flow pipes (13). Outer fins (17) made of an aluminum brazing sheet having brazing material layers on both sides are also arranged outside the pipe assembly (14) of the refrigerant flow pipes (13) at both left and right ends. In addition, aluminum side plates (18) are arranged outside the outer fins (17) at both left and right ends, and are brazed to the outer fins (17). A ventilation gap is also formed between the outer fin (17) and the side plate (18) at the left and right ends.

  The outer fin (17) is positioned behind the front edge of the front refrigerant flow pipe (13) and is finned to the refrigerant flow pipe (13) before and after each pipe assembly (14) (19 ) And an outwardly extending portion (21) provided to extend forward of the front side edge of the front refrigerant flow pipe (13) while continuing to the front side edge of the fin body portion (19). The projecting width (W) from the front refrigerant flow pipe (13) in the outward projecting portion (21) of the outer fin (17) is preferably 2 to 7 mm. The side plate (18) is brazed from the fin body portion (19) of the outer fin (17) at the left and right ends to the outwardly projecting portion (21).

  Here, all the gaps formed between the outwardly projecting portions (21) of the two outer fins (17) arranged in the ventilation gap (15) adjacent in the left-right direction of the heat exchange core portion (4) are The water holding gap (22) for holding condensed water or the water discharging gap (23) for discharging condensed water, and the water holding gap (22) and the water discharging gap (23) are arranged alternately. It has been. In the water discharge gap (23), an aluminum flat drainage member (24) whose longitudinal direction faces the up-and-down direction and whose width direction faces the ventilation direction (front-rear direction) is disposed, and the drainage member (24) The outer fins (17) on both sides forming the water discharge gap (23) are brazed to the outward projecting portions (21). The lower end of the drainage member (24) is located above the upper surface of the second header tank (3). Note that the drainage member (24) does not necessarily have to be brazed to the outwardly projecting portion (21) of the outer fin (17), and may be in contact therewith.

  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). A refrigeration cycle is also configured, and the air conditioner is mounted on a vehicle, such as an automobile, that temporarily stops an engine that is a drive source of the compressor when the vehicle is stopped. 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 (13). While the refrigerant flows in the refrigerant flow pipe (13), heat exchange is performed with the air passing through the ventilation gap (15), and the refrigerant flows out in a gas phase.

  At this time, it is cooled by the refrigerant flowing in the refrigerant flow pipe (13), and condensed water is generated on the surface of the outer fin (17), and it is caused to flow forward by the wind and from the outwardly projecting portion (21) to the water retaining gap. (22) enters and is held in the water holding gap (22) by capillary force, and cold water as sensible heat is stored in the condensed water. Further, at least a part of the condensed water held in the water holding gap (22) is frozen, and cold heat as latent heat is stored. Further, the condensed water generated on the surface of the outer fin (17) while the compressor is operating cannot be fully retained in the water retaining gap (22), and the outwardly protruding portion of the outer fin (17) It is transmitted from (21) to the drainage member (24) disposed in the water discharge gap (23), flows downward along the drainage member (24), and is drained. Therefore, scattering of condensed water is suppressed.

  When the compressor is stopped, the cooling heat as sensible heat of the condensed water held in the water holding gap (22), or the latent heat of ice when the condensed water freezes in the water holding gap (22) And the cold heat as the sensible heat of the condensed water after melting passes through the refrigerant flow pipe (13), and the cold storage container (16) passes through the fin body portion (19) of the outer fin (17). It is transmitted to the air passing through the ventilation gap (15) on both sides of the arranged ventilation gap (15). Therefore, it is possible to extend the cooling time for cooling to the air flowing through the ventilation gap (15), and even if the temperature of the wind passing through the evaporator (1) rises, the wind is cooled. In addition, a rapid decrease in cooling capacity is suppressed for a relatively long time.

  The evaporator according to the present invention is suitably used for a refrigeration cycle that constitutes a car air conditioner for a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

(1): Evaporator
(13): Refrigerant distribution pipe
(15): Ventilation gap
(16): Cold storage container
(17): Outer fin
(19): Fin body
(21): Outward projecting part
(22): Water retention gap
(23): Water discharge gap
(24): Drainage member

Claims (3)

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 In an evaporator in which a ventilation gap is formed and fins are arranged in the ventilation gap,
The fin includes a fin main body part joined to the refrigerant flow pipe, and an outward projecting part that is connected to the leeward side edge of the fin main body part and extends to the leeward side of the refrigerant flow pipe. All the gaps formed between the outwardly projecting portions of the two fins arranged in the ventilation gap are water holding gaps for holding condensed water or water discharge gaps for discharging condensed water, The holding gaps and the water discharge gaps are alternately arranged, drainage members extending in the vertical direction are disposed in the water discharge gaps, and the drainage members are outwardly projecting portions of the fins forming the water discharge gaps. Evaporator in contact with The evaporator according to claim 1, wherein the drainage member and the outwardly projecting portion of the fin are brazed. The evaporator according to claim 1 or 2, wherein a protruding width from the refrigerant circulation pipe in the outwardly protruding portion of the fin is 2 to 7 mm.

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