JP2016145657A - Evaporator and air conditioner for vehicle using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of removing dirt accumulated at the entire fin at low cost.SOLUTION: In an intermediate part in a ventilation direction of an upper header tank 2 between the upper header tank 2 of an evaporator 1 and an upper end of a corrugated fin 6, a washing liquid ejection pipe 7 extending in a longitudinal direction of the upper header tank 2 is arranged. In the washing liquid ejection pipe 7, plurality of nozzle holes 28 facing oblique downward toward a leeward side and for ejecting a washing liquid toward the corrugated fin 6, and a plurality of nozzle holes 29 facing oblique downward toward a windward side and for ejecting the washing liquid toward the corrugated fin 6 are formed at an interval in the longitudinal direction of the washing liquid ejection pipe 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an evaporator suitably used for a vehicle air conditioner that is a refrigeration cycle mounted on, for example, an automobile, and a vehicle air conditioner using the evaporator.

  In this specification and claims, the top and bottom of FIGS. 1 to 3 and 5 are referred to as top and bottom.

  As a vehicle air conditioner, a casing having an air inlet, an air outlet, and an air passage through the air inlet and the air outlet, an evaporator arranged in the air passage of the casing and constituting a refrigeration cycle, and the casing And an air blower that blows air into the passenger compartment, and the evaporators are arranged in parallel at intervals with the longitudinal direction directed vertically and the width direction directed toward the air. A plurality of flat heat exchange tubes arranged, a pair of upper and lower header tanks arranged on both upper and lower sides of the heat exchange tubes in a state where the longitudinal direction is directed to the direction of arrangement of the heat exchange tubes, and in the longitudinal direction of the header tanks Fins arranged between adjacent heat exchange pipes, and two upper and lower header tanks with the longitudinal direction facing the longitudinal direction of both header tanks. The header sections are arranged side by side in the ventilation direction, and a plurality of heat exchange pipes are arranged between the leeward header sections and between the leeward header sections of both header tanks and connected to both header sections. It is widely known that a refrigerant inlet is provided at one end of the side header portion and a refrigerant outlet is provided at the same end as the refrigerant inlet in the windward header portion of the upper header tank.

  By the way, if the above-described vehicle air conditioner is used for a long period of time, dirt accumulates on the fins of the evaporator, odor is generated, causing discomfort to passengers in the passenger compartment, and ventilation resistance increases and cooling performance decreases. There is a fear.

  In order to solve such problems, conventionally, the evaporator has been removed from the casing of the vehicle air conditioner and cleaned, or the entire evaporator has been replaced with a new one. However, in this case, there is a problem that the cost becomes high.

  Therefore, as a vehicle air conditioner that can easily remove the dirt accumulated in the fins of the evaporator, a cleaning nozzle that sprays the cleaning liquid on the evaporator is disposed upstream of the evaporator in the air passage of the casing in the air flow direction. There has been proposed a vehicle air conditioner in which a cleaning liquid is supplied to a cleaning nozzle from a cleaning liquid storage tank disposed outside the casing (see Patent Document 1).

  However, in the vehicle air conditioner described in Patent Document 1, it is difficult to clean the leeward side portions of the fins.

JP 2001-171338 A

  An object of the present invention is to provide an evaporator capable of solving the above-described problems and removing dirt accumulated on the entire fins at low cost, and a vehicle air conditioner using the evaporator.

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

1) Heat exchange between a plurality of heat exchange tubes arranged in parallel and spaced apart from each other with the longitudinal direction facing up and down, and fins arranged between adjacent heat exchange tubes In an evaporator provided with an upper header tank arranged at least on the upper and lower sides of the heat exchange pipe in a state in which the pipes are aligned,
An evaporator in which a cleaning liquid ejection pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, and a plurality of nozzle holes for ejecting the cleaning liquid toward the fin are formed in the cleaning liquid ejection pipe .

  2) The cleaning liquid jet pipe is arranged in the middle of the ventilation direction of the upper header tank, and the cleaning liquid jet pipe faces the nozzle hole facing diagonally downward toward the leeward side and diagonally downward toward the windward side. The evaporator according to 1) above, wherein a nozzle hole is formed.

  3) The upper header tank is provided with two header portions whose longitudinal direction is directed to the longitudinal direction of the upper header tank, arranged in the ventilation direction, and opens downward between the two header portions on the lower surface of the upper header tank. In addition, the evaporator according to 2) above, wherein a recess extending in the longitudinal direction of the upper header tank is formed, and the cleaning liquid ejection pipe is disposed so that at least a part thereof is positioned in the recess.

  4) The cleaning liquid jet pipe is disposed in the upwind portion of the upper header tank in the ventilation direction, and the cleaning liquid jet pipe is formed with a nozzle hole facing obliquely downward toward the leeward side. Evaporator.

  5) A recess that opens obliquely downward toward the windward side and extends in the longitudinal direction of the upper header tank is formed at the connecting portion between the lower surface of the upper header tank and the windward side surface, and the cleaning liquid ejection pipe is at least partially The evaporator according to 4) above, wherein the evaporator is disposed so as to be located in the recess.

6) A casing having an air inlet, an air outlet, and an air passage through the air inlet and the air outlet, an evaporator disposed in the air passage of the casing and constituting a refrigeration cycle, and an air passage of the casing A vehicle air conditioner comprising an air blower that blows air into the vehicle interior and sends air;
The evaporator comprises the evaporator according to any one of claims 1 to 5, wherein one end of the cleaning liquid jet pipe of the evaporator is closed, and a portion near the other end is protruded to the outside of the casing, in the cleaning liquid jet pipe A vehicle air conditioner in which a cleaning liquid supply pipe is connected to a portion protruding outside the casing.

  According to the evaporators 1) to 5), the cleaning liquid jet pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, and the cleaning liquid is supplied to the cleaning liquid jet pipe toward the fin. Since a plurality of nozzle holes to be ejected are formed, the evaporator is arranged in the air passage of the casing of the vehicle air conditioner, one end of the cleaning liquid ejection pipe is closed, and the portion near the other end is projected outside the casing. If the cleaning liquid supply pipe is connected to the portion of the cleaning liquid jet pipe protruding outside the casing, the fins can be cleaned with the cleaning liquid jetted from the nozzle hole of the cleaning liquid jet pipe. Therefore, it is not necessary to remove the evaporator from the casing, and the cost is reduced. Moreover, a cleaning liquid jet pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, and a plurality of nozzle holes for jetting the cleaning liquid toward the fin are formed in the cleaning liquid jet pipe. Therefore, the distance between the nozzle hole and the fin becomes closer than the distance between the cleaning nozzle and the evaporator fin in the vehicle air conditioner described in Patent Document 1, and the entire fin can be efficiently cleaned.

  In addition, since the cleaning liquid jet pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, the upper header tank and the cleaning liquid jet pipe are formed of aluminum, so that the evaporator Simultaneously with the production, the cleaning liquid jet pipe can be brazed to the upper header tank. In addition, since the cleaning liquid jet pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, the cleaning liquid jet pipe is hardly obstructed, and the evaporator can be handled easily.

  According to the evaporators 2) to 5), the entire fin can be effectively cleaned.

  According to the vehicle air conditioner of 6), the fins can be cleaned with the cleaning liquid ejected from the nozzle hole of the cleaning liquid ejection pipe, so that it is not necessary to remove the evaporator from the casing, and the cost is reduced. In addition, the distance between the nozzle hole of the cleaning liquid ejection pipe and the fin of the evaporator is closer than the distance between the cleaning nozzle and the fin of the evaporator in the vehicle air conditioner described in Patent Document 1, so that the entire fin can be efficiently cleaned. It becomes possible.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to the present invention. It is the AA line expanded sectional view of Drawing 1 which omitted some. It is the BB sectional drawing of FIG. 2 which abbreviate | omitted one part. It is a horizontal sectional view which shows roughly the vehicle air conditioner using the evaporator of FIG. It is a figure equivalent to a part of FIG. 2 which shows other embodiment of the evaporator by this invention.

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

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

  In the following description, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIGS. 1 and 2) is the front, and the opposite side is the rear. The left and right sides in FIGS.

  FIG. 1 shows the overall structure of an evaporator according to the present invention, and FIGS. 2 and 3 show the structure of the main part thereof. FIG. 4 schematically shows an air conditioner for a vehicle using the evaporator shown in FIG.

  1 to 3, the evaporator (1) has an aluminum upper header tank (2) arranged in the vertical direction with the width direction directed in the ventilation direction and the longitudinal direction directed in the left-right direction. And an aluminum lower header tank (3), an aluminum heat exchange pipe (5) and an aluminum corrugated fin (6), and a heat exchange core provided between the header tanks (2) (3) Part (4) and an aluminum cleaning liquid jet pipe (7) disposed between the upper header tank (2) and the corrugated fin (6) and extending in the longitudinal direction of the upper header tank (2). .

  The upper header tank (2) is located on the leeward side (front side) and the leeward header section (8) with the longitudinal direction facing the left and right direction, and on the windward side (rear side) and the longitudinal direction on the left and right direction A windward header section (9) directed toward the head, and a coupling section (11) that couples and integrates the header sections (8) and (9). The lower header tank (3) is located on the leeward side (front side) and the leeward side header section (12) with the longitudinal direction facing the left and right direction, and located on the windward side (rear side) and the longitudinal direction in the left and right direction A windward header portion (13) directed toward the windward side, and a connecting portion (14) for connecting and integrating the header portions (12) and (13) to each other. In the following description, the leeward header portion (8) of the upper header tank (2) is the leeward upper header portion, the leeward header portion (12) of the lower header tank (3) is the leeward lower header portion, and the upper header tank. The windward header part (9) of (2) is called the windward upper header part, and the windward header part (13) of the lower header tank (3) is called the windward lower header part. A refrigerant inlet (15) is provided at the right end of the leeward upper header portion (8), and a refrigerant outlet (16) is provided at the right end of the leeward upper header portion (9).

  In the heat exchange core section (4), a plurality of flat aluminum heat exchange pipes (5) arranged at intervals in the left-right direction with the longitudinal direction oriented in the vertical direction and the width direction directed in the ventilation direction Two tube rows (17) and (18) are arranged side by side in the front-rear direction, and the ventilation gap between adjacent heat exchange tubes (5) of each tube row (17) and (18) and Corrugated fins (6) are placed outside the heat exchange pipe (5) so as to straddle the heat exchange pipes (5) of both the front and rear tube rows (17) and (18), and brazed to the heat exchange pipe (5). Then, aluminum side plates (19) are respectively arranged outside the corrugated fins (6) at both left and right ends and brazed to the corrugated fins (6). The corrugated fin (6) is shared by the heat exchange tubes (5) before and after the leeward tube row (17) and the windward tube row (18).

  In the evaporator (1) of this embodiment, the refrigerant that has flowed into the leeward upper header portion (8) from the refrigerant inlet (15) flows through all the heat exchange pipes (5) to reach the leeward upper header portion (9 ) Flows out from the refrigerant outlet (16) at the right end.

  The upper header tank (2) forms the lower part of the leeward upper header part (8) and the leeward upper header part (9), and the heat exchange pipes (5) of both tube rows (17) (18) are connected. Aluminum first tank constituent member (21), and aluminum that covers the upper side of the first tank constituent member (21) and forms the upper part of the leeward upper header part (8) and the upper leeward header part (9) The second tank constituent member (22), the first tank constituent member (21), and the second tank constituent member (22) disposed between the second tank constituent member (22) and the leeward upper header section (8) A third tank component member (23) made of aluminum having front and rear partition portions (23a) (23b) for partitioning the inside of the portion (9) into upper and lower spaces (8a), (8b), (9a), and (9b), and a refrigerant inlet (15) and a refrigerant outlet (16), and an aluminum end member (24) brazed to the right end of the first to third tank components (20), (21) and (22), Third tank component (21) (22) (23) And a closing member (not shown) for closing the left end of the leeward upper header portion (8) and the leeward upper header portion (9) of the upper header tank (2).

  The first tank component (21) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and the lower part (heat exchange pipe (5 ) Side section) forming a first header forming section (21a) having a substantially U-shaped cross section upward, and a lower section (heat exchange pipe (5) side section) forming a windward upper header section (9) A U-shaped second header forming portion (21b) having a generally upward U-shape, and a connecting wall (21c) that connects the header forming portions (21a) and (21b) together and constitutes the lower portion of the connecting portion (11). I have. In both header forming portions (21a) and (21b) of the first tank component (21), the tube insertion holes (25) that are long in the front-rear direction are spaced apart in the left-right direction and are located in the same portion in the left-right direction. The upper end portion of the heat exchange pipe (5) of the leeward side tube row (17) is inserted into the tube insertion hole (25) of the first header forming portion (21a), and the first tank component (21 ) And the upper end portion of the heat exchange pipe (5) of the windward side tube row (18) is inserted into the tube insertion hole (25) of the second header forming portion (21b), and the first tank component (21 ) Is brazed.

  The second tank component (22) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and the upper part of the leeward upper header part (8) (heat exchange pipe (5) The first header forming part (22a) having a substantially U-shaped transverse cross-section forming the upper part of the windward upper header part (9) (the part opposite to the heat exchange pipe (5)) A U-shaped second header forming portion (22b) having a substantially downward cross-sectional cross section, and a connecting wall that connects the header forming portions (22a) and (22b) and constitutes the upper portion of the connecting portion (11) ( 22c).

  The third tank component (23) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and the front and rear partition portions (23a) (23b) are connected to each other by the first tank component. The connecting wall (21c) of (21) and the connecting wall (22c) of the second tank component (22) are interposed between the connecting walls (21c) and (22c) and brazed, and the connecting portion ( 11) is connected and integrated by a connecting wall (23c) that forms the center in the vertical direction. The upper and lower spaces (8a) and (8b) of the leeward upper header part (8) are positioned at appropriate positions on the front partition part (23a) and the rear partition part (24) of the third member (22), and the windward side. A communication hole (26) is formed through the upper and lower spaces (9a) and (9b) of the upper header (9).

  A recess that opens downward and extends in the longitudinal direction of the upper header tank (2) between the header forming portions (21a) and (21b) of the first tank component (21) on the lower surface of the upper header tank (2). 27) is formed. Both ends in the longitudinal direction of the recess (27) are opened at both left and right ends of the upper header tank (2). The recess (27) extends outward in the front-rear direction downward, and the front and rear side surfaces (27a) (27b) of the recess (27) are inclined outward in the front-rear direction.

  The cleaning liquid jet pipe (7) is disposed so that at least a part, here, the whole is located in the recess (27) on the lower surface of the upper header tank, with the longitudinal direction facing the left-right direction. The tank (2) is brazed to the front and rear side surfaces (27a) and (27b) of the recess (27). The cleaning liquid jet pipe (7) has a plurality of nozzle holes (28) that are directed obliquely downward toward the leeward side and eject the cleaning liquid toward the front part of the corrugated fin (6), and are inclined toward the leeward side. A plurality of nozzle holes (29) that face downward and eject the cleaning liquid toward the rear part of the corrugated fin (6) are formed at intervals in the longitudinal direction. The cleaning liquid jet pipe (7) is closed at the right end and opened at the left end, and a fixed length portion (7A) near the left end protrudes to the left from the upper header tank (2).

  The lower header tank (3) has substantially the same configuration as the upper header tank (2), and is disposed upside down with respect to the upper header tank (2). The same parts as those of the upper header tank (2) in the lower header tank (3) are denoted by the same reference numerals. The lower header tank (3) is not provided with the refrigerant inlet (15) and the refrigerant outlet (16), and therefore does not include the end member (24). And the right end part of the leeward side lower header part (8) and the leeward side lower header part (9) is closed by a suitable closing member.

  The evaporator (1) described above constitutes a refrigeration cycle together with a compressor, a condenser as a refrigerant cooler, and an expansion valve as a pressure reducer, and as a vehicle air conditioner (30) as shown in FIG. Installed.

  In FIG. 4, the vehicle air conditioner (30) has an air inlet (32), an air outlet (33), and an air passage (34) through which the air inlet (32) and the air outlet (33) are passed. A plastic casing (31), and an evaporator (6) disposed in an air passage (34) of the casing (31) and constituting a refrigeration cycle together with a compressor, a refrigerant cooler (condenser), a decompressor, and the like And a blower (35) for sending air into the air passage (34) of the casing (31) and blowing the air into the vehicle compartment.

  A fixed length portion (7A) near the opening end of the cleaning liquid jet pipe (7) of the evaporator (1) is projected outside the casing (31), and the cleaning liquid supply pipe is formed at the opening end of the cleaning liquid jet pipe (7). (36) is connected.

  Although not shown in the drawings, as is well known, the air outlet (33) of the casing (31) is connected to the air outlet formed in the casing (31) so as to blow out air to each part in the passenger compartment. A blowout port for blowing out air can be switched by the blowout position switching device. Further, a heater core is also disposed in the air passage (34) of the casing (31), and the temperature blown out from the outlet is adjusted by an appropriate means.

  In the vehicle air conditioner (30) described above, the cleaning liquid is sent into the cleaning liquid ejection pipe (7) through the cleaning liquid supply pipe (36) periodically or when an unpleasant odor occurs in the interior of the automobile. The cleaning liquid sent into the cleaning liquid jet pipe (7) is blown out from the nozzle holes (28) and (29) toward the entire corrugated fin (6), and the corrugated fin (6) is cleaned by the blown cleaning liquid. .

  FIG. 5 shows another embodiment of an evaporator according to the present invention.

  In the evaporator (40) shown in FIG. 5, the upper header tank (2) has a longitudinal opening at the connecting portion between the lower surface and the rear surface (windward side surface) of the upper header tank (2). A recess (41) extending in the direction is formed. Both ends in the longitudinal direction of the recess (41) are open to the left and right ends of the upper header tank (2). The inner peripheral surface of the recess (41) is a partial cylindrical surface.

  The cleaning liquid ejection pipe (7) is arranged so that a part of the outer peripheral surface is located in the recess (41) with the longitudinal direction facing the left-right direction, and a part of the outer peripheral surface is the upper header tank (2). The recess (41) is brazed to the inner peripheral surface (41a). The cleaning liquid ejection pipe (7) is formed with a plurality of nozzle holes (42) which are directed obliquely downward toward the leeward side and eject the cleaning liquid toward the corrugated fin (6) at intervals in the longitudinal direction. ing. The cleaning liquid ejection pipe (7) is closed at the right end and opened at the left end, and a fixed length portion near the left end protrudes to the left from the upper header tank (2).

  Other configurations are the same as those of the evaporator (1) shown in FIGS. 1 to 3, and the same portions are denoted by the same reference numerals.

  The evaporator according to the present invention is suitably used for a vehicle air conditioner mounted on an automobile.

(1) (40): Evaporator
(2): Upper header tank
(5): Heat exchange pipe
(6): Corrugated fin
(7): Cleaning liquid jet pipe
(8): Upper header on the leeward side
(9): Upwind upper header
(27) (41): Recess
(28) (29) (42): Nozzle hole
(30): Vehicle air conditioner
(31): Casing
(32): Air inlet
(33): Air outlet
(34): Air passage
(35): Blower
(36): Cleaning liquid supply pipe

Claims (6)

A plurality of heat exchange tubes arranged in parallel with a gap between each other in a state in which the longitudinal direction is directed in the vertical direction, fins arranged between adjacent heat exchange tubes, and the longitudinal direction of the heat exchange tubes In an evaporator provided with an upper header tank arranged at least on the upper and lower sides of the heat exchange pipe in a state of being oriented in the alignment direction,
An evaporator in which a cleaning liquid ejection pipe extending in the longitudinal direction of the upper header tank is arranged between the upper header tank and the upper end of the fin, and a plurality of nozzle holes for ejecting the cleaning liquid toward the fin are formed in the cleaning liquid ejection pipe . The cleaning liquid jet pipe is arranged in the middle of the upper header tank in the ventilation direction, and the cleaning liquid jet pipe has a nozzle hole facing diagonally downward toward the leeward side and a nozzle hole facing diagonally downward toward the windward side The evaporator according to claim 1 formed. The upper header tank is provided with two header portions whose longitudinal direction is directed to the longitudinal direction of the upper header tank, arranged in the ventilation direction, and opens downward between the two header portions on the lower surface of the upper header tank, and The evaporator according to claim 2, wherein a recess extending in a longitudinal direction of the upper header tank is formed, and the cleaning liquid ejection pipe is disposed so that at least a part thereof is located in the recess. The evaporator according to claim 1, wherein the cleaning liquid ejection pipe is disposed in an upwind portion of the upper header tank in the ventilation direction, and the cleaning liquid ejection pipe is formed with a nozzle hole that faces obliquely downward toward the leeward side. A concavity between the lower surface of the upper header tank and the windward side surface is formed with a recess that opens obliquely downward toward the windward side and extends in the longitudinal direction of the upper header tank. The evaporator of Claim 4 arrange | positioned so that it may be located in a place. A casing having an air inlet, an air outlet, and an air passage through which the air inlet and the air outlet are passed, an evaporator disposed in the air passage of the casing and constituting a refrigeration cycle, and air in the air passage of the casing A vehicle air conditioner comprising a blower that feeds air into the vehicle interior and
The evaporator comprises the evaporator according to any one of claims 1 to 5, wherein one end of the cleaning liquid jet pipe of the evaporator is closed, and a portion near the other end is protruded to the outside of the casing, in the cleaning liquid jet pipe A vehicle air conditioner in which a cleaning liquid supply pipe is connected to a portion protruding outside the casing.

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