JP2016075457A - Evaporator and vehicular air conditioner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of restricting reduction in performance while being used under its inclined state.SOLUTION: An inside part of downwind side and upwind side headers 5 of a first header tank 2 of an evaporator 1 is divided by dividing members 43, 44 into a plurality of segments 40, 41, 42, and farthest tube groups 15C in downwind side and upwind side tube rows 15 are communicated with the farthest segment 42. The farthest segment 42 in both headers 5 is divided by a divided flow control part 57 into an upper side first space 42a and a lower side second space 42b and both spaces 42a, 42b are not communicated to each other by the divided flow control part 57. The first space 42a in the farthest segment 42 in the downwind side upper header 5 and the first space 41a of the segment 41 adjacent to the former one are communicated to each other through a first communication hole 47 of the dividing member 44, and the second space 42b in the farthest segment 42 and the second space 42b in the segment 41 adjacent to the former one are communicated to each other by a second communication hole 50 of the dividing member 44. An area of the first communication hole 47 is set to be larger than an area of the second communication hole 50.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.

  As an evaporator used in a vehicle air conditioner, a pair of header tanks arranged at intervals in the vertical direction are arranged at intervals in the longitudinal direction of the header tank with the longitudinal direction directed in the vertical direction. Tube rows made of a plurality of heat exchange tubes are provided in a plurality of rows at intervals in the ventilation direction, and each header tank includes a leeward header portion and a windward header portion provided side by side in the ventilation direction, At least one tube row is disposed between the leeward side and the leeward header portion of both header tanks, and both ends of the heat exchange tubes are connected to the leeward side and the leeward header portion of both header tanks. A refrigerant inlet is provided at one end of the leeward header portion of the header tank, and a refrigerant outlet is provided at the same end as the refrigerant inlet in the leeward header portion. Downstream flow consisting of a plurality of heat exchange tubes and refrigerant flowing from top to bottom in the heat exchange tubes in the tube rows connected to the leeward header portions of both header tanks and the tube rows connected to the windward header portions. A tube group and a plurality of heat exchange tubes and an upflow tube group in which the refrigerant flows from bottom to top are alternately provided, and the refrigerant flowing from the refrigerant inlet passes through the heat exchange tubes of all the tube groups. The farthest tube group farthest from the refrigerant inlet of the leeward side tube row and the farthest tube group farthest from the refrigerant outlet of the windward side tube row are both descending flow tubes that flow out from the refrigerant outlet. And the farthest tube groups arranged in the ventilation direction form one path, and the leeward side and the upwind side of the upper header tank An evaporator is known in which a section through which the farthest tube group of both tube rows communicates is provided in the header section, and the both sections are communicated via a communication section provided between both sections (Patent Document 1). FIG. 12).

  By the way, in the evaporator described in Patent Document 1, the evaporator may be used in an inclined state when viewed from the outside in the longitudinal direction of the header tank. In this case, two of the upper header tanks through which the two farthest tube groups are communicated due to the influence of gravity. A large amount of refrigerant will flow into the lower compartment of the compartment, and the amount of refrigerant flowing into the heat exchange tubes of the farthest tube group leading to the lower compartment will lead to the upper compartment. More than the amount of refrigerant flowing into the heat exchange tubes of the farthest tube group. Therefore, the amount of refrigerant flowing through the heat exchange tube located on the leeward side and the heat exchange tube located on the upwind side in the path constituted by the two farthest tube groups becomes non-uniform, and the performance of the evaporator may be reduced.

JP 2009-156532 A

  The object of the present invention is to solve the above-mentioned problem and suppress performance degradation even when one first header tank is used in an inclined state where it is positioned below the other second header tank. An object of the present invention is to provide an evaporator and a vehicle air conditioner using the same.

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

1) With the longitudinal direction in the same direction and between the pair of header tanks arranged at intervals in the vertical direction, the longitudinal direction is in the direction connecting the two header tanks, and the spacing in the longitudinal direction of the header tank is set. A plurality of rows of heat exchange tubes arranged in a row are provided at intervals in the ventilation direction, and each header tank is provided in a row in the ventilation direction. And at least one tube row is disposed between the leeward side and the windward side header portions of both header tanks, and both ends of the heat exchange tubes are connected to the leeward side and the windward side header portions of both header tanks. The refrigerant inlet is provided at one end of the leeward header portion of any header tank, and the same end as the refrigerant inlet in the leeward header portion of the header tank A refrigerant outlet is provided, and each of the leeward tube row connected to the leeward header portion of both header tanks and the windward tube row connected to the leeward header portion is composed of a plurality of heat exchange tubes, and the refrigerant is heated. A downflow tube group that flows from the top to the bottom in the exchange tube and a plurality of heat exchange tubes and an upflow tube group in which the refrigerant flows from the bottom to the top are alternately provided, from the refrigerant inlet of the leeward tube row The farthest tube group at the farthest position and the farthest tube group at the furthest position from the refrigerant outlet of the windward tube row are the downflow tube groups, both farthest tube groups are aligned in the ventilation direction, and the farthest both When one path is constituted by the tube group and the first header tank is located on the windward side with respect to the second header tank when viewed from the outside in the longitudinal direction of the header tank. In addition, in the evaporator used in an inclined state such that the leeward header portion of the first header tank is located above the leeward header portion,
A plurality of sections arranged in the longitudinal direction of the first header tank are provided inside the leeward header portion and the leeward header portion of the first header tank, and in the leeward header portion and the leeward header portion of the first header tank The farthest tube group of both tube rows is passed through the farthest section farthest from the refrigerant inlet and the refrigerant outlet, and the farthest section of the leeward header section of the first header tank is connected to the heat exchange tube by the flow dividing control section. In the longitudinal direction, the space is divided into a first space located on the heat exchange tube side and a second space located on the opposite side thereof, and both spaces are brought into a non-communication state by the diversion controller, and the windward header portion The farthest section is divided into a first space located on the heat exchange tube side and a second space located on the opposite side in the longitudinal direction of the heat exchange tube by the diversion control unit. The space is communicated through a refrigerant passage hole formed in the flow dividing control unit, the heat exchange tube is communicated to the first space of both farthest sections, and the second spaces of both furthest sections are both second spaces. The first space and the second space of the farthest section of the leeward header section of the first header tank and the section adjacent to the farthest section are in communication with each other. An evaporator in which the passage area of the inlet portion of the first space is larger than the passage area of the inlet portion of the second space.

  2) The inside of the leeward header section and the leeward header section of the first header tank is divided into a plurality of sections arranged in the longitudinal direction of the first header tank by the dividing member, and the first farthest section of the leeward header section is divided. The first space and the second space and a section adjacent to the farthest section are communicated through communication holes formed on both sides of the flow dividing control portion in the dividing member, and the communication hole is the first of the farthest section. The space and the entrance portion of the second space, and the area of the communication hole that becomes the entrance portion of the first space in the divided member is larger than the area of the communication hole that also becomes the entrance portion of the second space 1) The evaporator described.

  3) The end portions of the first space and the second space in the leeward header section of the first header tank that are adjacent to each other in the first space and the second space are all open, and the openings in the first space and the second space are It becomes the entrance part of 1 space and the 2nd space, and the area of the opening used as the entrance part of the 1st space by adjusting the position of the longitudinal direction of the heat exchange tube in a diversion control part is also the 2nd space. The evaporator according to 1), wherein the evaporator is larger than the area of the opening serving as the inlet.

  4) Continuing to the flow dividing control unit that divides the farthest section of the leeward header section of the first header tank into the first space and the second space, protrudes into the section adjacent to the farthest section, and the farthest section A lateral baffle that divides the adjacent compartment in the longitudinal direction of the heat exchange tube is provided over the entire width of the leeward header portion in the ventilation direction, and the longitudinal dimension of the leeward header portion in the lateral baffle plate is in the farthest compartment. A length that is shorter than the longitudinal dimension of the leeward header portion in the adjacent section and that has at least one heat exchange tube leading to the section adjacent to the farthest section within the longitudinal direction of the lateral baffle plate The evaporator according to any one of 1) to 3) above.

5) The first header tank located on the upper side in the inclined state is provided with a refrigerant inlet and a refrigerant outlet, and one row of tube rows is arranged between the leeward side and the leeward header portion of both header tanks. Three tube groups are provided in the row, and two tube groups are provided in the leeward tube row, the nearest tube group located closest to the refrigerant inlet of the leeward tube row and the farthest from the refrigerant inlet. The far tube group is the downflow tube group and the intermediate tube group is the upflow tube group, and the farthest tube group farthest from the refrigerant outlet in the windward tube row is the downflow tube group and the refrigerant outlet. The nearest tube group at the closest position is the upflow tube group, and the nearest tube group in the leeward tube row is the first pass, Axial intermediate tube group becomes the second pass, the leeward side and the farthest tube group of windward tube row becomes the third pass, recent tube group of windward tube row has a fourth path,
From the intermediate tube group of the leeward side tube row, the refrigerant that has flowed into the section adjacent to the farthest section in the leeward header section of the first header tank located on the upper side in the inclined state is in the farthest section of the leeward header section. The refrigerant flowing into the first space and the second space, the refrigerant flowing into the first space flows into the heat exchange tube of the farthest tube group of the leeward side tube row, and the refrigerant flowing into the second space passes through the communication portion After flowing into the second space of the furthest section of the windward header section, it flows into the first space through the refrigerant passage hole of the flow dividing control section, and flows into the heat exchange tube of the farthest tube group from the first space. The evaporator according to any one of 1) to 4), which is configured as described above.

  6) The first header tank located on the upper side in the inclined state is a first member to which the heat exchange tube is connected, the second member that is joined to the first member and covers the opposite side of the first member from the heat exchange tube. And a third member that is disposed between the first member and the second member and has a partition portion that partitions the leeward side and the windward side header portion of the first header tank into two spaces in the vertical direction, The part existing in the farthest section of the three-member partition is the flow dividing control section, and the part existing in the other section of the third member partition is the first space in which each section is located on the heat exchange tube side. And a flow passage control portion that divides the space into the second space located on the opposite side, and a refrigerant passage hole is formed through the space to allow the flow separation control portion to pass through both spaces, and the farthest section of the leeward header portion of the first header tank First sky And the second space and the 5 said that the first space and the second space sections adjacent to the farthest section is a communicating state) evaporator according.

  7) A casing having a ventilation path inside, a temperature adjustment section that is provided in the casing and adjusts the temperature of the air sent into the casing, and sends air to the ventilation path in the casing, and the temperature adjustment section adjusts the temperature. A vehicle air conditioner having an evaporator disposed in a ventilation path in the casing, wherein the evaporator of the temperature control unit is the above 1) to 6 ), The evaporator is located on the upper side with respect to the other second header tank when one evaporator is viewed from the outside in the longitudinal direction of the header tank, and the first header A vehicle air conditioner in which the leeward header portion of the tank is disposed in an inclined state positioned above the windward header portion.

  8) An air heating section and a bypass section that bypasses the air heating section are provided downstream of the evaporator in the ventilation path in the casing in the air flow direction, and the temperature adjustment section is configured to warm the air in the ventilation path in the casing. The vehicle according to the above 7), comprising: a heater core disposed in the section; and an air mix damper that adjusts a ratio of an amount of air sent to the heater core after passing through the evaporator and an amount of air that bypasses the heater core after passing through the evaporator Air conditioner.

  According to the evaporators 1) to 6), a plurality of sections arranged in the longitudinal direction of the first header tank are provided inside the leeward header portion and the leeward header portion of the first header tank. The farthest tube group of both tube rows is led to the farthest section farthest from the refrigerant inlet and the refrigerant outlet in the leeward header part and the leeward header part of the tank, and the farthest of the leeward header part of the first header tank The partition is divided into a first space located on the heat exchange tube side and a second space located on the opposite side in the longitudinal direction of the heat exchange tube by the flow dividing control unit. The farthest section of the windward header section is placed in the longitudinal direction of the heat exchange tube in the longitudinal direction of the heat exchange tube and the first space located on the side opposite to the first space by the shunt control section. It is divided into two spaces, and both spaces are communicated through a refrigerant passage hole formed in the flow dividing control unit, a heat exchange tube is communicated to the first space of both farthest sections, The second spaces are communicated with each other via a communication portion provided between the second spaces, and the first and second spaces of the farthest section of the leeward header portion of the first header tank and the farthest section. Since the passage area of the inlet portion of the first space is larger than the passage area of the inlet portion of the second space, the section adjacent to the first tank is seen from the outside in the longitudinal direction of the header tank. In this case, the first header tank is located on the upwind side with respect to the second header tank, and the leeward header part of the first header tank is located on the upside with respect to the upwind header part. But both The amount of coolant flowing through the heat exchange tubes located in the heat exchanger tubes and the windward side is located on the leeward side in one pass constituted by a tube group is made uniform, the performance degradation of the evaporator is suppressed. That is, the refrigerant flowing into the first space of the farthest section from the section adjacent to the farthest section of the leeward header portion of the first header tank is stored in the first space and then is a leeward tube that is a downflow tube group. It flows directly into the farthest tube group in the row. In addition, the refrigerant that has flowed into the second space of the farthest section from the section adjacent to the farthest section of the leeward header section of the first header tank is the second of the farthest sections of both the leeward header section and the leeward header section. It flows into the second space of the furthest section of the windward header section through the communication portion provided between the spaces, and then passes through the refrigerant passage hole formed in the flow dividing control section of the furthest section of the windward header section. Then, it flows into the first space and then flows into the farthest tube group of the windward tube row that is the downflow tube group. Since the passage area of the inlet portion of the first space is larger than the passage area of the inlet portion of the second space, the amount of refrigerant flowing into the second space is the amount of refrigerant flowing into the first space. The amount of refrigerant flowing into the first space of the farthest section of the windward header portion located on the lower side is reduced. As a result, the amount of refrigerant flowing into the heat exchange tube of the farthest tube group of the leeward side tube row from the first space of the farthest zone of the leeward header portion and the wind from the first space of the farthest zone of the leeward header portion. The amount of refrigerant flowing into the heat exchange tubes of the farthest tube group in the upper tube row is made uniform, and the heat exchange tube located on the leeward side and the heat exchange located on the windward side in the path constituted by both farthest tube groups The amount of refrigerant flowing through the tube is made uniform, and the performance degradation of the evaporator is suppressed.

  According to the evaporators 2) and 3), a plurality of compartments arranged in the longitudinal direction of the first header tank are provided inside the leeward header portion and the leeward header portion of the first header tank. The first space and the second space of the farthest section of the leeward header section of the header tank are in communication with the section adjacent to the farthest section, and the passage area of the inlet portion of the first space is Making it larger than the passage area of the entrance portion of the second space can be performed relatively easily.

  According to the evaporator of the above 4), when used in the inclined state, the refrigerant amount flowing into the second space in the farthest section of the leeward header portion of the first header tank also flows into the first space. The amount of refrigerant that can be effectively reduced below the amount of refrigerant, and as a result, flows from the first space of the farthest section of the leeward header section into the heat exchange tube of the farthest tube group of the leeward tube row, and the windward side The amount of refrigerant flowing from the first space of the farthest section of the header portion into the heat exchange tubes of the farthest tube group of the windward tube row is effectively equalized.

  According to the evaporator of 6) above, a plurality of sections are provided on the leeward side and the leeward header part of the first header tank located on the upper side in the inclined state, and the farthest section of the leeward side and the leeward header part is divided. Dividing into two first and second spaces by the control unit, forming a refrigerant passage hole only in the branching control unit in the farthest section of the windward header section, and communicating through the second spaces in both farthest sections Providing a portion between both the second spaces, and making the passage area of the inlet portion of the first space in the farthest section of the leeward header portion larger than the passage area of the inlet portion of the second space, It can be done relatively easily.

  According to the vehicle air conditioners of 7) and 8) above, the amount of refrigerant flowing into the first space through the second space of the farthest section of the windward header portion located below the evaporator is reduced, and the leeward side The amount of refrigerant flowing into the heat exchange tube of the farthest tube group of the leeward side tube row from the first space of the farthest zone of the header portion, and the farthest of the windward tube row from the first space of the farthest zone of the windward header portion. The amount of refrigerant flowing into the heat exchange tubes of the far tube group is made uniform. As a result, the amount of refrigerant flowing through the heat exchange tube located on the leeward side and the heat exchange tube located on the leeward side in the path constituted by both the farthest tube groups is made uniform, and the performance degradation of the evaporator is suppressed.

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 line expanded sectional view of Drawing 1 which omitted some. It is the CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a disassembled perspective view which shows the 1st header tank of the evaporator of FIG. It is a disassembled perspective view which shows the 2nd header tank of the evaporator of FIG. It is a figure which shows the flow of the refrigerant | coolant in the evaporator of FIG. FIG. 2 is a vertical sectional view schematically showing a vehicle air conditioner using the evaporator of FIG. 1. It is a figure equivalent to a part of FIG. 2 which shows the modification of the 1st header tank used for the evaporator of FIG. It is a figure equivalent to a part of Drawing 2 showing other modifications of the 1st header tank used for the evaporator of Drawing 1.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment described below, the evaporator according to the present invention is applied to a refrigeration cycle constituting a vehicle air conditioner.

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

  In the following description, the downstream side (direction indicated by arrow X in the drawing) of the air flowing through the ventilation gap between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear. The left and right of 3 are called left and right.

  FIG. 1 shows the overall configuration of an evaporator to which the evaporator of the present invention is applied, FIGS. 2 to 7 schematically show the configuration, and FIG. 8 shows the flow of refrigerant in the evaporator of FIG. FIG. 9 schematically shows a vehicle air conditioner using the evaporator shown in FIG.

  1 to 5, the evaporator (1) has an aluminum first header tank (2) and an aluminum second header tank (3) that are oriented in the same direction in the longitudinal direction and spaced apart in the vertical direction. And a heat exchange core part (4) provided between the header tanks (2) and (3). The first header tank (2) is located on the leeward side (front side) and the leeward side header portion (5) with the longitudinal direction facing the left and right direction, and located on the windward side (rear side) and the longitudinal direction on the left and right direction A windward header portion (6) facing the head and a connecting portion (7) for connecting and integrating the header portions (5) and (6) to each other. The second header tank (3) is located on the leeward side (front side) and the leeward side header portion (8) with the longitudinal direction facing the left and right direction, and located on the windward side (rear side) and the longitudinal direction on the left and right direction A windward header portion (9) facing the head and a connecting portion (11) for connecting and integrating the header portions (8) and (9) to each other. In the following description, the leeward header portion (5) of the first header tank (2) is the leeward upper header portion, the leeward header portion (8) of the second header tank (3) is the leeward lower header portion, The upwind header section (6) of the 1 header tank (2) is referred to as the upwind header section, and the upwind header section (9) of the second header tank (3) is referred to as the upwind lower header section. A refrigerant inlet (12) is provided at the right end of the leeward upper header portion (5), and a refrigerant outlet (13) is provided at the right end of the leeward upper header portion (6).

  The evaporator (1) is configured so that the first header tank (2) is above the second header tank (3) and the wind is viewed from the outside in the longitudinal direction (left or right) of the header tank (2) (3). Located on the upper side, the leeward upper header part (5) of the first header tank (2) is located above the leeward upper header part (6) and the leeward lower side of the third header tank (3). The header portion (8) is used in an inclined state such that the header portion (8) is positioned above the windward lower header portion (9).

  In the heat exchange core part (4), a plurality of aluminum disposed in the left-right direction with the longitudinal direction oriented in the direction connecting the header tanks (2) (3) and the width direction in the ventilation direction Two tube rows (15) and (16) made of extruded shape flat heat exchange tubes (14) are arranged side by side in the front-rear direction, and adjacent to each tube row (15) and (16) ( 14) Aluminum corrugated fins (17) across the heat exchange tubes (14) of the front and rear tube rows (15), (16) on the outside of the ventilation gap between the heat exchanger tubes (14) on the left and right ends, respectively. ) Is placed and brazed to the heat exchange tube (14), and aluminum side plates (18) are respectively placed outside the corrugated fins (17) at the left and right ends and brazed to the corrugated fins (17). . The upper and lower ends of the heat exchange tubes (14) of the leeward side tube row (15) are inserted so as to protrude into the leeward side upper and lower headers (5) and (8). 8) are connected in a continuous manner, and the upper and lower ends of the heat exchange tubes (14) in the windward tube row (16) are inserted so as to protrude into the windward upper and lower headers (6) and (9). In the state, it is connected to both header parts (6) and (9) in a continuous manner. The number of heat exchange tubes (14) in the leeward tube row (15) is equal to the number of heat exchange tubes (14) in the windward tube row (16). The corrugated fin (17) is shared by the heat exchange tubes (14) before and after the leeward tube row (15) and the windward tube row (16).

  In the leeward tube row (15), there are three tube groups (15A) (15B) (15C) consisting of a plurality of heat exchange tubes (14) spaced apart in the left-right direction from the right end to the left end. The windward tube row (16) is arranged side by side and includes two heat exchange tubes (14) arranged at intervals in the left-right direction (tube group of the leeward tube row (15) ( Tube groups (16A) and (16B), which are one less than the number of 15A), 15B, and 15C), are provided side by side from the left end toward the right end. Here, the three tube groups (15A), (15B), and (15C) in the leeward side tube row (15) are moved from the refrigerant inlet (12) side end (right end) toward the other end (left end). ~ Third tube group, the two tube groups (16A) and (16B) in the windward tube row (16) are connected to the refrigerant outlet (13) side from the end (left end) opposite to the refrigerant outlet (13). It shall be called the 4th-5th tube group toward an end (right end). The third tube group (15C) is the farthest tube group farthest from the refrigerant inlet (12) in the leeward tube row (15), and the fourth tube group (16A) is the windward tube row (16 ) At the farthest position from the refrigerant outlet (13).

  As shown in FIGS. 2 to 6, the first header tank (2) forms the lower part of the leeward upper header part (5) and the leeward upper header part (6), and both tube rows (15) ( The aluminum first member (20) to which the heat exchange tube (14) of 16) is connected, and brazed to the first member (20) and opposite to the heat exchange tube (14) in the first member (20) An aluminum second member (21) covering the side (upper side) and forming the upper part of the leeward upper header part (5) and the windward upper header part (6), the first member (20) and the second member ( 21) and made of aluminum having front and rear partition sections (23) and (24) that partition the leeward upper header section (5) and the leeward upper header section (6) into upper and lower spaces, respectively. A third member (22), an end member (25) provided with a refrigerant inlet (12) and a refrigerant outlet (13) and brazed to the right end of the first to third members (20) (21) (22) ).

  The first member (20) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and has a substantially U-shaped cross section that forms the lower portion of the leeward upper header portion (5). A first header forming portion (26) having a letter shape, a second header forming portion (27) having a substantially U-shaped cross section that forms the lower portion of the windward upper header portion (6), and both header forming portions ( 26) (27) It is composed of a connecting wall (28) for connecting the two and constituting the lower part of the connecting portion (7). In both header forming portions (26) and (27) of the first member (20), tube insertion holes (29) that are long in the front-rear direction are formed so as to be spaced apart in the left-right direction and located in the same part in the left-right direction The upper end of the heat exchange tube (14) is inserted into the tube insertion hole (29) and brazed to the first member (20) using the brazing material layer of the first member (20). .

  The second member (21) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and has a substantially U-shaped cross section that forms the upper portion of the leeward upper header portion (5). -Shaped first header forming portion (31), a second header forming portion (32) having a substantially U-shaped cross section that forms the upper portion of the windward upper header portion (6), and both header forming portions (31) (32) The connecting wall (33) that connects the two and constitutes the upper portion of the connecting portion (7). At the position where the third tube group (15C) is provided in the second member (21), a recessed portion (34) opened to the heat exchange tube (14) side and recessed upward is provided as a first header forming portion ( 31), the second header forming portion (32) and the connecting wall (33) are deformed to form a space in the left-right direction.

  The third member (22) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and the front and rear partitions (23) and (24) are connected to each other by the first member (20). It is interposed between the connecting wall (28) and the connecting wall (33) of the second member (21), brazed to both connecting walls (28), (33), and the connecting portion (7) in the vertical direction. They are connected and integrated by a connecting wall (36) that forms the central portion.

  The portion between the first tube group (15A) and the second tube group (15B) in the front partition (23) of the third member (22), and the second tube group (15B) and the third tube group (15C ) And the portion between the fourth tube group (16A) and the fifth tube group (16B) in the rear partitioning portion (24) of the third member (22), respectively, are long in the front-rear direction. A slit (38) is formed. In the slit (38) of the front partition (23), the same number of compartments as the tube group (15A) (15B) (15C) in the leeward tube row (15) in the left-right direction inside the leeward upper header (5) ( Plate-like divided members (43) and (44) that are divided into 40, 41, and 42 are inserted and brazed to the first to third members (20), (21), and (22). In the slit (38) of the rear partition (24), inside the windward upper header (6), the same number of partitions (45) as the tube group (16A) (16B) of the windward tube row (16) in the left-right direction (45 ) (46), a split member (43) is inserted and brazed to the first to third members (20), (21) and (22). The dividing members (43) and (44) are formed of an aluminum brazing sheet having brazing material layers on both sides. The leeward side upper header part (5) and the leeward side upper header part (6) are partitioned into upper and lower spaces by front and rear partition parts (23) and (24) of the third member (22). The first space (40a) in which the inside of the compartments (40) (41) (42) and (45) (46) is located on the heat exchange tube (14) side (lower side) in the longitudinal direction of the heat exchange tube (15). ) (41a) (42a) (45a) (46a) and a second space (40b) (41b) (42b) (45b) (46b) located on the opposite side (upper side) . In the part located below the partition part (23) in the dividing member (44) between the second section (41) and the third section (42) of the leeward side upper header section (5), both sections (41 ) (42) through-hole-shaped first communication holes (47) are formed through the first spaces (41a) (42a). Further, in the part located above the partition part (23) in the dividing member (44) between the second section (41) and the third section (42) of the leeward side upper header section (5), both sections A penetrating second communication hole (50) is formed through the second spaces (41b) and (42b) of (41) and (42).

  The total length in the left-right direction of the first section (40) and the second section (41) in the leeward upper header section (5) is the left-right direction of the fifth section (46) in the leeward upstream header section (6). The length in the left-right direction of the third section (42) of the leeward upper header section (5) is equal to the length in the left-right direction of the fourth section (45) of the windward upper header section (6). ing.

  Here, the three sections (40), (41), and (42) of the leeward upper header section (5) are moved from the refrigerant inlet (12) side end (right end) toward the other end (left end). The first section to the third section, and the two sections (45) and (46) of the upwind header section (6) are connected to the refrigerant outlet (13) from the end (left end section) opposite to the refrigerant outlet (13). ) It shall be called 4th-5th division toward a side edge part (right edge part). The first to third sections (40), (41), and (42) are connected to the heat exchange tubes (14) of the first to third tube groups (15A), (15B), and (15C), and the fourth to fifth sections (45 ) (46) is connected to the heat exchange tubes (14) of the fourth to fifth tube groups (16A) and (16B). The third section (42) is the farthest section through which the third tube group (15C) is located farthest from the refrigerant inlet (12) in the leeward upper header section (5) and is the farthest tube group. Yes, the fourth section (45) is farthest from the refrigerant outlet (13) in the upwind header section (6) and the farthest tube group (16A) that is the farthest tube group communicates It is a parcel.

  In the portion on the left side of the third tube group (15C) in the front partition (23) of the third member (22) and the portion on the left side of the fourth tube group (16A) in the rear partition (24), Long slits (48) are formed in the front-rear direction. A closing plate (49) for closing the left end portion of the leeward upper header portion (5) is inserted into the slit (48) of the front partitioning portion (23) to insert the first to third members (20), (21), (22). ) And a closing plate (49) for closing the left end portion of the windward upper header portion (6) is inserted into the slit (48) of the rear partition portion (24) to insert the first to third members ( 20) Brazed to (21) and (22). The closing plate (49) is formed of an aluminum brazing sheet having brazing material layers on both sides.

  The first space (40a) (41a) and the second space (40b) (41b) of the first and second sections (40) (41) of the leeward upper header portion (5), and the windward upper header portion (6 ) Of the fourth and fifth sections (45) and (46), the first space (45a) and (46a) and the second space (45b) and (46b) are the front partition (23) of the third member (22) and The rear partition portion (24) is communicated by a plurality of refrigerant passage holes (51) that are formed with long holes in the front-rear direction formed at intervals in the left-right direction. The length of the refrigerant passage hole (51) in the front-rear direction is shorter than the width of the heat exchange tube (14) in the front-rear direction, and the front and rear ends of the heat exchange tube (14) are the front and rear ends of the refrigerant passage hole (51), respectively. It protrudes outward in the front-back direction.

  The third partition (42) of the leeward side upper header section (5) is divided into a first space (42a) and a second space (42b), and a refrigerant is passed through the front partition (23) of the third member (22). No hole is formed, and both spaces (42a) and (42b) are in a non-communication state.

  The front and rear partition portions (23) and (24) of the third member (22) have a notch (53) formed from the right end thereof, and the first partition is formed by the notch (53) of the front partition portion (23). The first and second spaces (40a) and (40b) of (40) are communicated with each other, and the refrigerant inlet (12) is communicated with the first and second spaces (40a) and (40b). The first and second spaces (46a) and (46b) of the fifth section (46) are communicated with each other by the notch (53) of the portion (24), and the refrigerant outlet (13) is connected to the first and second spaces. (46a) and (46b).

  From the second space (42b) of the third section (42) located farthest from the refrigerant inlet (12) in the leeward upper header part (5) and from the refrigerant outlet (13) in the leeward upper header part (6) The second space (45b) of the fourth section (45) located at the farthest position is that the lower end opening of the recessed portion (34) of the second member (21) is formed by the connecting wall (36) of the third member (22). It is made to communicate by the communicating path (37) formed by being blocked.

  As shown in FIGS. 2 to 4 and 7, the second header tank (3) has substantially the same configuration as the first header tank (2), and is disposed upside down with respect to the first header tank (2). Has been. The same parts as those of the first header tank (2) in the second header tank (3) are denoted by the same reference numerals. The second header tank (3) is not provided with the refrigerant inlet (12) and the refrigerant outlet (13), and therefore does not include the end member (25). And the 1st member (20) forms the upper part which becomes the heat exchange tube (14) side of the leeward lower header part (8) and the windward lower header part (9), and the second member (21) is the first. Covering the opposite side of the member (20) from the heat exchange tube (14), a leeward lower header part (8) and a lower part of the leeward lower header part (9) are formed. The front partition (23) of the third member (22) partitions the leeward lower header (8) into two spaces in the vertical direction, and the rear partition (24) is on the leeward lower header (9 ) The interior is divided into two spaces in the vertical direction. The space below the leeward lower header (8) and the windward lower header (9) has the same configuration as the space above the leeward upper header (5) and windward upper header (6). Has the same configuration as the lower space. The first member (20) and the second member (21) of the second header tank (3) have the same configuration as the first member (20) and the second member (21) of the first header tank (2). is there.

  A slit (38) that is long in the front-rear direction is formed in a portion between the second tube group (15B) and the third tube group (15C) in the front partition (23) of the third member (22). In the slit (38), in the leeward lower header section (8), a section (54) that is one less than the number of tube groups (15A) (15B) (15C) in the leeward tube row (15) in the left-right direction A dividing member (43) to be divided into (55) is inserted and brazed to the first to third members (20), (21) and (22). The two sections (54) and (55) of the leeward lower header section (8) are referred to as first to second sections from the refrigerant inlet (12) side end (right end) toward the other end (left end). Shall. In addition, the inside of the windward lower header section (9) is one less than the tube group (16A) (16B) of the windward tube row (16), in this case, one section (56). The section (56) is referred to as a third section. The leeward lower header portion (8) and the leeward lower header portion (9) are partitioned into upper and lower spaces by front and rear partition portions (23) and (24) of the third member (22). The first spaces (54a) (55a) (56a) in the compartments (54) (55) (56) are located on the heat exchange tube (14) side (upper side) in the longitudinal direction of the heat exchange tube (15). ) And a second space (54b) (55b) (56b) located on the opposite side (lower side).

  The total length in the left-right direction of the first to second sections (54), (55) in the leeward lower header section (8) is the left-right direction of the third section (56) in the leeward lower header section (9). Is equal to the length of The length in the left-right direction of the second section (55) of the leeward side lower header section (8) is the same as that of the third section (42) of the leeward side upper header section (5) and the windward upper header section (6). The length in the left-right direction of the first section (54) of the leeward lower header portion (8) is equal to the length in the left-right direction of the fourth section (45). 40) and the second section (41), and the length of the fifth section (46) of the upwind header section (6) in the left-right direction is equal.

  The first space (54a) (55a) and the second space (54b) (55b) of the first and second sections (54) (55) of the leeward lower header portion (8), and the windward lower header portion (9 The first space (56a) and the second space (56b) of the third section (56) are formed by long holes formed in the front partition (23) and the rear partition (24) in the front-rear direction. The refrigerant is passed through a refrigerant passage hole (51). The length in the front-rear direction of the refrigerant passage hole (51) is shorter than the width in the front-rear direction of the heat exchange tube (14), and the front and rear end portions of the heat exchange tube (14) are the front and rear end portions of the refrigerant passage hole (51), respectively. It protrudes outward in the front-back direction.

  The second space (55b) of the second section (55) of the leeward lower header section (8) and the second space (56b) of the third section (56) of the leeward lower header section (9) are connected to each other. It is connected through a passage (37). In addition, the portion on the right side of the first tube group (15A) in the front partition (23) of the third member (22) and the portion on the right side of the fifth tube group (16B) in the rear partition (24). In addition, a slit (48) that is long in the front-rear direction is formed, and a closing plate (49) that closes the right end of the leeward side lower header (8) is formed in the slit (48) of the front partition (23). Inserted and brazed to the first to third members (20), (21) and (22), and the right end of the upwind lower header (9) is closed in the slit (48) of the rear partition (24) A closing plate (49) is inserted and brazed to the first to third members (20), (21) and (22).

  Refrigerant inlet (12), refrigerant outlet (13), communication path (37), compartments (40) (41) (42) (45) (46), dividing members (43) (44), refrigerant as described above By providing the passage hole (51), the notch (53), and the sections (54) (55) (56), the refrigerant is the farthest tube of the first tube group (15A) and the leeward side tube row (15). The third tube group (15C), which is the group, and the fourth tube group (16A), which is the farthest tube group of the windward tube row (16), will flow from top to bottom in the heat exchange tube (14), These tube groups (15A), (15C), and (16A) constitute a downflow tube group. In addition, the refrigerant flows from the bottom to the top in the heat exchange tubes (14) of the second tube group (15B) and the fifth tube group (16B), and these tube groups (15B, 16B) rise. It is a flow tube group. 3rd tube group (15C) (farthest tube group) of leeward side tube row (15), and 4th tube group (16A) (farthest tube group) of windward side tube row (16) (14) ) In the same direction.

  Therefore, as shown in FIG. 8, the refrigerant flowing in from the refrigerant inlet (12) flows through the two paths as follows and flows out from the refrigerant outlet (13). The first path includes a first section (40), a first tube group (15A), a first section (54), a second tube group (15B), a second section (41), a third section (42), The fourth section (45), the fourth tube group (16A), the third section (56), the fifth tube group (16B) and the fifth section (46), and the second path is the first section (40 ), First tube group (15A), first section (54), second tube group (15B), second section (41), third section (42), third tube group (15C), second section (55), the third section (56), the fifth tube group (16B) and the fifth section (46). The first tube group (15A) is the first pass, the second tube group (15B) is the second pass, the third and fourth tube groups (15C) (16A) are the third pass, and the fifth tube group (16B). ) Constitutes the fourth path.

  Here, the third and fourth tube groups (15C) and (16A) which are the farthest tube groups in the front and rear partition portions (23) and (24) of the third member (22) of the first header tank (2) communicate. The part that divides the farthest section (42) (45) into the first and second spaces (42a) (42b) (45a) (45b) is the refrigerant flow to the tube groups (15C) (16A) in the third pass. It becomes a flow dividing control part (57) (58) which controls a flow dividing, and the 1st and 2nd space (42a) (42b) of the farthest section (42) of the leeward side upper header part (5) is a flow dividing control part According to (57), it is in a non-communication state. In addition, the first and second spaces (45a) and (45b) of the farthest section (45) of the upwind header section (6) are connected via the refrigerant passage hole (51) formed in the flow dividing control section (58). It is made to communicate. The second spaces (42b) and (45b) of both farthest sections (42) and (45) are communicated with each other via the communication path (37).

  The first space (42a) of the farthest section (42) of the leeward upper header portion (5) of the first header tank (2) and the first of the second section (41) adjacent to the farthest section (42). The space (41a) is a first communication hole provided on the lower side (heat exchange tube (14) side) of the flow dividing control part (57) in the divided member (44) between the two compartments (42) and (41). (47) through the second space (42b) of the farthest section (42) of the leeward upper header section (5) of the first header tank (2) and adjacent to the farthest section (42) And the second space (41b) of the second section (41) that is above the flow dividing control section (57) in the divided member (44) between the sections (42) and (41) (the heat exchange tube (14) and Is communicated through a second communication hole (50) provided on the opposite side. Accordingly, the first communication hole (47) of the split member (44) serves as an inlet to the first space (42a) of the farthest section (42), and the second communication hole (50) of the split member (44). Is the entrance to the second space (42b) of the farthest section (42), and the passage area of the first communication hole (47) serving as the entrance of the first space (42a) is the second space ( 42b) is larger than the passage area of the second communication hole (50) serving as the inlet.

  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 decompressor, and is mounted on a vehicle, for example, an automobile, as a vehicle air conditioner as shown in FIG. .

  In FIG. 9, a vehicle air conditioner (70) includes a synthetic resin casing (71) having an air passage (72) therein, a casing (71), an evaporator (1), and a casing (71 ) The temperature adjustment unit (73) for adjusting the temperature of the air sent into the air) and the air adjustment channel (73) in the casing (71) sent air to the temperature adjustment unit (73). A blower (not shown) that blows air into the passenger compartment.

  The casing (71) is provided with an air intake (74) for taking in air sent from the blower, a defroster opening (75), a face opening (76) and a foot opening (77). (74), the defroster opening (75), the face opening (76), and the foot opening (77) are communicated with each other by a ventilation path (72) provided in the casing (71). The evaporator (1) is located on the upstream side of the air flow path (72) near the air inlet (74) in the air flow direction in the first header tank (2) when viewed from the outside in the longitudinal direction of the header tank (2) (3). Is located above the second header tank (3) and on the windward side, and the leeward upper header part (5) of the first header tank (2) is located above the windward upper header part (6). And the leeward side lower header portion (8) of the third header tank (3) is disposed in an inclined state so as to be located on the upper side with respect to the windward side lower header portion (9).

  An air heating section (72a) and a bypass section (72b) that bypasses the air heating section (72a) are provided downstream of the evaporator (1) in the ventilation path (72) in the casing (71) in the air flow direction. It has been. In addition to the evaporator (1), the temperature adjustment unit (73) includes a heater core (78) disposed in the air heating unit (72a) of the ventilation path (72) in the casing (71) and the evaporator (1). The ratio of the amount of air sent to the heater core (78) of the air heating unit (72a) after passing through and the amount of air sent to the bypass unit (72b) after passing through the evaporator (1) and bypassing the heater core (78) And an air mix damper (79) for adjusting the pressure. The air mix damper (79) has a first position (see the chain line in FIG. 9) for sending all the air that has passed through the evaporator (1) to the heater core (78) of the air heating section (72a), and the evaporator (1). The opening is appropriately changed between the second position (see the solid line in FIG. 9) where all the air that has passed is sent to the bypass section (72b) and the heater core (78) is bypassed, thereby passing through the heater core (78). The ratio of the flow rate of the air to flow and the flow rate of the air that bypasses the heater core (79) is adjusted.

  Three blowing mode switching doors (81), (82), (83) are provided downstream of the air heating section (72a) and the bypass section (72b) in the ventilation path (72) in the casing (71) in the air flow direction. The blowout mode switching doors (81), (82), and (83) are provided so that the air whose temperature is adjusted in the temperature adjusting section (73) is sent out from the defroster opening (75) and the defroster duct (shown in the figure). When the air is blown toward the front window through the abbreviation), when the air is blown out from the face opening (76) and through the face duct (not shown) toward the head of the occupant, and the foot opening. Switching from the part (77) through the foot duct (not shown) toward the occupant's feet is possible.

  When the vehicle air conditioner (70) is in operation, the refrigerant that has passed through the compressor, the condenser, and the expansion valve flows in from the refrigerant inlet (12) and out of the refrigerant outlet (13) through the two paths described above. While the refrigerant flows in the heat exchange tube (14) of the leeward tube row (15) and in the heat exchange tube (14) of the windward tube row (16), the ventilation gap of the heat exchange core (4) Heat exchange with the air passing through, the air is cooled, and the refrigerant flows out as a gas phase.

  The evaporator (1) is located on the upper side and the windward side of the first header tank (2) as viewed from the longitudinal outside of the header tanks (2) and (3). 1 The leeward upper header part (5) of the header tank (2) is located above the upwind upper header part (6) and the leeward lower header part (8) of the third header tank (3) Even if it is arranged in an inclined state so as to be located on the upper side with respect to the upper lower header part (9), the heat exchange tube (14) of the third tube group (15C) is arranged as follows. The amount of refrigerant flowing in and the amount of refrigerant flowing into the heat exchange tube (14) of the fourth tube group (16A) are made uniform, and the performance degradation of the evaporator (1) is suppressed.

  That is, from the first space (41a) of the second section (41) of the leeward upper header portion (5) of the first header tank (2) through the first communication hole (47) of the dividing member (44), The refrigerant flowing into the first space (42a) of the far section (42) accumulates in the first space (42a) and then enters the farthest tube group (15C) of the leeward side tube row (15) which is the downflow tube group. Direct inflow. Further, the first header tank (2) passes through the second communication hole (50) of the dividing member (44) from the second space (41b) of the second section (41) of the leeward upper header portion (5). The refrigerant flowing into the second space (42b) of the far section (42) flows into the second space (45b) of the farthest section (45) of the windward upper header section (6) through the communication path (37). Then, after flowing into the first space (45a) through the refrigerant passage hole (51) formed in the flow dividing control unit (58), the farthest tube of the windward side tube row (16) which is a downflow tube group Enter group (16A). Then, the passage area of the first communication hole (47) which is the entrance portion of the first space (42a) of the farthest section (42) is the same as the second communication hole (50) which is the entrance portion of the second space (42b). ), The amount of refrigerant flowing into the second space (42b) is smaller than the amount of refrigerant flowing into the first space (42a), and the wind positioned below in the inclined state The amount of refrigerant flowing into the first space (45a) of the farthest section (45) of the upper upper header portion (6) is reduced. As a result, it flows from the first space (42a) of the farthest section (42) of the leeward side upper header (5) into the heat exchange tube (14) of the farthest tube group (15C) of the leeward side tube row (15). The amount of refrigerant to be transferred and the heat exchange tube (14) of the farthest tube group (16A) of the windward tube row (16) from the first space (45a) of the furthest section (45) of the windward header section (6) Of the third tube group (15C) and the windward side of the third tube group (15C) located on the leeward side in the path constituted by the two farthest tube groups (15C) (16A). The amount of the refrigerant flowing through the heat exchange tubes (14) of the fourth tube group (16A) located at the center is made uniform, and the performance degradation of the evaporator (1) is suppressed.

  FIG. 10 shows a modification of the first header tank.

  In FIG. 10, the farthest section of the portion existing in the second section (41) of the leeward upper header section (5) in the front partition section (23) of the third member (22) of the first header tank (2). On the (42) side (left side), there is provided a holeless portion (60) in which no coolant passage hole (51) is formed, and the holeless portion (60) is provided on the leeward side upper header portion (5). The farthest section (42) is connected to the flow dividing control section (57) that divides the first space (42a) and the second space (42b), protrudes to the inner side (right side) of the second section (41), and the second section A horizontal baffle plate (61) that partitions the inside of (41) in the longitudinal direction of the heat exchange tube (14). The horizontal baffle plate (61) has a horizontal dimension (longitudinal direction of the leeward upper header section (5)) and a second compartment (41) lateral dimension (longitudinal direction of the leeward upper header section (5)). Shorter than the longitudinal direction of the lateral baffle plate (61) and at least one heat exchange tube (14) of the second tube group (15B) in the second section (41). It has become. The lateral dimension of the lateral baffle plate (61) is, for example, ½ or less of the lateral dimension of the second compartment (41) and within the longitudinal range of the lateral baffle plate (61). The length is such that a plurality of heat exchange tubes (14) of the second tube group (15B) are present in (41).

  Other configurations are the same as those of the first header tank (2) of the evaporator (1) shown in FIGS.

  When the first header tank (2) is configured as shown in FIG. 10, the leeward upper header portion (5) of the first header tank (2) from the heat exchange tube (14) of the second tube group (15B). ) Part of the refrigerant flowing into the first space (41a) of the second section (41) passes through the first communication hole (47) of the dividing member (44) and the first of the farthest section (42). It flows into the space (42a) and, after having accumulated in the first space (42a), directly flows into the farthest tube group (15C) of the leeward side tube row (15), which is the downflow tube group. Moreover, it flows into the 1st space (41a) of the 2nd division (41) of the leeward side upper header part (5) of the 1st header tank (2) from the heat exchange tube (14) of the 2nd tube group (15B). The remaining refrigerant flows to the right along the baffle plate (61), then enters the second space (41b) through the refrigerant passage hole (51), and moves left in the second space (41b). It flows into the second space (42b) of the farthest section (42) through the second communication hole (50) of the dividing member (44). The refrigerant flowing into the second space (42b) of the farthest section (42) passes through the communication path (37) and enters the second space (45b) of the farthest section (45) of the windward upper header section (6). And then flows into the first space (45a) through the refrigerant passage hole (51) formed in the flow dividing control unit (58), and then the furthest of the windward side tube row (16) which is the downflow tube group It flows into the tube group (16A). Then, the passage area of the first communication hole (47) which is the entrance portion of the first space (42a) of the farthest section (42) is the same as the second communication hole (50) which is the entrance portion of the second space (42b). ) And a flow dividing control section (57) that divides the farthest section (42) of the leeward upper header section (5) into a first space (42a) and a second space (42b). ), A lateral baffle (61) is provided that projects inward (right side) of the second compartment (41) and partitions the inside of the second compartment (41) in the longitudinal direction of the heat exchange tube (14). Due to the above, the amount of refrigerant flowing into the second space (42b) is smaller than the amount of refrigerant flowing into the first space (42a), and the windward upper header portion (6) located on the lower side in the inclined state The amount of refrigerant flowing into the first space (45a) of the farthest section (45) is reduced. As a result, it flows from the first space (42a) of the farthest section (42) of the leeward side upper header (5) into the heat exchange tube (14) of the farthest tube group (15C) of the leeward side tube row (15). The amount of refrigerant to be transferred and the heat exchange tube (14) of the farthest tube group (16A) of the windward tube row (16) from the first space (45a) of the furthest section (45) of the windward header section (6) Of the third tube group (15C) and the windward side of the third tube group (15C) located on the leeward side in the path constituted by the two farthest tube groups (15C) (16A). The amount of the refrigerant flowing through the heat exchange tubes (14) of the fourth tube group (16A) located at the center is made uniform, and the performance degradation of the evaporator (1) is suppressed.

  FIG. 11 shows another modification of the first header tank.

  In FIG. 11, the dividing member (44) is not disposed between the second section (41) and the third section (42) of the leeward upper header section (5) of the first header tank (2). The end (right end) of the first space (41a) and the second space (41b) side of the second section (41) in the first space (42a) and the second space (42b) of the farthest section (42) However, it opens to the whole, and the right end opening of the first space (42a) and the second space (42b) of the farthest section (42) is the inlet portion (65) (66). The right end opening serving as the inlet of the first space (42a) of the farthest section (42) is adjusted by adjusting the position of the heat exchange tube (14) in the longitudinal direction (vertical direction) in the diversion controller (57). Is larger than the area of the right end opening which is also the entrance of the second space (42b).

  Here, by moving the position of the third member (22) of the first header tank (2) upward, the positions of the front and rear partition parts (23) and (24) are moved upward, whereby the farthest section ( The area of the right end opening which becomes the entrance part of the first space (42a) of 42) is larger than the area of the right end opening which becomes the entrance part of the second space (42b).

  Other configurations are the same as those of the first header tank (2) of the evaporator (1) shown in FIGS.

  When the first header tank (2) is configured as shown in FIG. 11, the leeward upper header portion (5) of the first header tank (2) from the heat exchange tube (14) of the second tube group (15B). The refrigerant that has flowed into the first space (41a) of the second section (41) of the liquid) flows into the first space (42a) of the farthest section (42), and descends after collecting in the first space (42a). It flows directly into the farthest tube group (15C) of the leeward tube row (15) that is the flow tube group. In addition, the refrigerant that has flowed into the first space (41a) of the second section (41) of the leeward upper header portion (5) enters the second space (41b) through the refrigerant passage hole (51), It flows leftward in the second space (41b) and flows into the second space (42b) of the farthest section (42). The refrigerant flowing into the second space (42b) of the farthest section (42) passes through the communication path (37) and enters the second space (45b) of the farthest section (45) of the windward upper header section (6). And then flows into the first space (45a) through the refrigerant passage hole (51) formed in the flow dividing control unit (58), and then the furthest of the windward side tube row (16) which is the downflow tube group It flows into the tube group (16A). And since the passage area of the entrance part (65) of the first space (42a) of the farthest section (42) is also larger than the passage area of the entrance part (66) of the second space (42b), The amount of refrigerant flowing into the second space (42b) is smaller than the amount of refrigerant flowing into the first space (42a), and the farthest section (6) of the windward upper header portion (6) located on the lower side in the inclined state ( The amount of refrigerant flowing into the first space (45a) of 45) is reduced. As a result, it flows from the first space (42a) of the farthest section (42) of the leeward side upper header (5) into the heat exchange tube (14) of the farthest tube group (15C) of the leeward side tube row (15). The amount of refrigerant to be transferred and the heat exchange tube (14) of the farthest tube group (16A) of the windward tube row (16) from the first space (45a) of the furthest section (45) of the windward header section (6) Of the third tube group (15C) and the windward side of the third tube group (15C) located on the leeward side in the path constituted by the two farthest tube groups (15C) (16A). The amount of the refrigerant flowing through the heat exchange tubes (14) of the fourth tube group (16A) located at the center is made uniform, and the performance degradation of the evaporator (1) is suppressed.

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

(1): Evaporator
(2): First header tank
(3): Second header tank
(5): First header tank leeward header section
(6): Windward header section of the first header tank
(8): The leeward header section of the second header tank
(9): Windward header section of the second header tank
(12): Refrigerant inlet
(13): Refrigerant outlet
(14): Heat exchange tube
(15): Downward tube row
(15A) (15B) (15C): First to third tube groups
(16): Windward tube row
(16A) (16B): Fourth to fifth tube groups
(20): First member
(21): Second member
(22): Third member
(23): Front partition
(24): Rear partition
(37): Communication path (communication part)
(38): Slit
(40) (41) (42): Section of the header section on the leeward side
(40a) (41a) (42a): 1st space
(40b) (41b) (42b): 2nd space
(43) (44): Division member
(45) (46): Section on the upwind header section
(45a) (46a): 1st space
(45b) (46b): Second space
(47): 1st communication hole (entrance)
(50): Second communication hole (entrance)
(51): Refrigerant passage hole
(57) (58): Shunt control unit
(61): Sideways baffle
(65) (66): Entrance
(70): Vehicle air conditioner
(71): Casing
(72): Ventilation path
(72a): Air heating unit
(72b): Detour section
(73): Temperature control unit
(78): Heater core
(79): Air mix damper

Claims (8)

Between the pair of header tanks which are arranged in the same direction and spaced apart in the vertical direction, the longitudinal direction of the header tank is spaced in the direction connecting the two header tanks. A plurality of rows of arranged heat exchange tubes are provided at intervals in the ventilation direction, and each header tank includes a leeward header portion and an upwind header portion provided side by side in the ventilation direction. In addition, at least one tube row is disposed between the leeward side and the leeward header portion of both header tanks, and both ends of the heat exchange tubes are connected to the leeward side and the leeward header portion of both header tanks. A refrigerant inlet is provided at one end of the leeward header portion of the header tank, and at the same end as the refrigerant inlet in the leeward header portion of the header tank. The leeward tube row connected to the leeward header portion of both header tanks and the leeward tube row connected to the windward header portion are each composed of a plurality of heat exchange tubes and the refrigerant is heated. A downflow tube group that flows from the top to the bottom in the exchange tube and a plurality of heat exchange tubes and an upflow tube group in which the refrigerant flows from the bottom to the top are alternately provided, from the refrigerant inlet of the leeward tube row The farthest tube group at the farthest position and the farthest tube group at the furthest position from the refrigerant outlet of the windward tube row are the downflow tube groups, both farthest tube groups are aligned in the ventilation direction, and the farthest both When one path is constituted by the tube group and the first header tank is located on the windward side with respect to the second header tank when viewed from the outside in the longitudinal direction of the header tank. , In the evaporator used in an inclined state as leeward header portion of the first header tank is located above with respect to the windward header section,
A plurality of sections arranged in the longitudinal direction of the first header tank are provided inside the leeward header portion and the leeward header portion of the first header tank, and in the leeward header portion and the leeward header portion of the first header tank The farthest tube group of both tube rows is passed through the farthest section farthest from the refrigerant inlet and the refrigerant outlet, and the farthest section of the leeward header section of the first header tank is connected to the heat exchange tube by the flow dividing control section. In the longitudinal direction, the space is divided into a first space located on the heat exchange tube side and a second space located on the opposite side thereof, and both spaces are brought into a non-communication state by the diversion controller, and the windward header portion The farthest section is divided into a first space located on the heat exchange tube side and a second space located on the opposite side in the longitudinal direction of the heat exchange tube by the diversion control unit. The space is communicated through a refrigerant passage hole formed in the flow dividing control unit, the heat exchange tube is communicated to the first space of both farthest sections, and the second spaces of both furthest sections are both second spaces. The first space and the second space of the farthest section of the leeward header section of the first header tank and the section adjacent to the farthest section are in communication with each other. An evaporator in which the passage area of the inlet portion of the first space is larger than the passage area of the inlet portion of the second space. The inside of the leeward header section and the leeward header section of the first header tank is divided into a plurality of sections arranged in the longitudinal direction of the first header tank by the dividing member, and the first space of the farthest section of the leeward header section And the second space and a section adjacent to the farthest section are communicated through communication holes formed on both sides of the flow dividing control portion in the dividing member, and the communication hole is the first space of the farthest section and The area of the communication hole which becomes the entrance part of the second space and becomes the entrance part of the first space in the divided member is larger than the area of the communication hole which also becomes the entrance part of the second space. The described evaporator. The first space of the farthest section of the leeward header section of the first header tank and the end section on the adjacent section side in the second space are opened to the whole, and the openings of the first space and the second space are the first space. And by adjusting the position of the heat exchange tube in the longitudinal direction in the flow dividing control section, the area of the opening serving as the inlet section of the first space is the same as the inlet section of the second space. The evaporator according to claim 1, wherein the evaporator has a larger area than the opening. It is connected to a flow dividing control unit that divides the farthest section of the leeward header section of the first header tank into a first space and a second space, protrudes inside the section adjacent to the farthest section, and is adjacent to the farthest section. A lateral baffle for partitioning the inside of the compartment in the longitudinal direction of the heat exchange tube is provided over the entire width in the ventilation direction of the leeward header, and the longitudinal dimension of the leeward header in the lateral baffle is adjacent to the farthest compartment. The length is shorter than the longitudinal dimension of the leeward header portion in the section, and within at least one heat exchange tube leading to the section adjacent to the farthest section within the longitudinal direction of the lateral baffle plate. The evaporator according to any one of claims 1 to 3. In the inclined state, the first header tank located on the upper side is provided with a refrigerant inlet and a refrigerant outlet, and one row of tube rows is arranged between the leeward side and the leeward side header portion of both header tanks. Three tube groups are provided, two tube groups are provided in the leeward tube row, and the most recent tube group located closest to the refrigerant inlet of the leeward tube row and the farthest tube farthest from the refrigerant inlet The group is a downflow tube group and the intermediate tube group is an upflow tube group, and the farthest tube group farthest from the refrigerant outlet in the windward tube row is the downflow tube group and closest to the refrigerant outlet. The most recent tube group at the position is the upflow tube group, and the most recent tube group in the leeward tube row is the first pass. Ku group intermediate tube is a second path, the farthest tube group of the leeward side and windward tube row becomes the third pass, recent tube group of windward tube row has a fourth path,
From the intermediate tube group of the leeward side tube row, the refrigerant that has flowed into the section adjacent to the farthest section in the leeward header section of the first header tank located on the upper side in the inclined state is in the farthest section of the leeward header section. The refrigerant flowing into the first space and the second space, the refrigerant flowing into the first space flows into the heat exchange tube of the farthest tube group of the leeward side tube row, and the refrigerant flowing into the second space passes through the communication portion After flowing into the second space of the furthest section of the windward header section, it flows into the first space through the refrigerant passage hole of the flow dividing control section, and flows into the heat exchange tube of the farthest tube group from the first space. The evaporator according to any one of claims 1 to 4, which is configured as described above. A first header tank located on the upper side in the inclined state; a first member to which a heat exchange tube is connected; a second member joined to the first member and covering the opposite side of the first member from the heat exchange tube; and A third member provided between the first member and the second member, and having a partition portion that partitions the leeward side and the windward side header portion of the first header tank into two spaces in the vertical direction, respectively. The part existing in the farthest section of the partition section is the flow dividing control section, and the section existing in the other section of the partition section of the third member is the first space where each section is located on the heat exchange tube side and this It becomes a flow dividing control part divided into the 2nd space located in the other side, and a refrigerant passage hole which makes both flow spaces pass to the flow dividing control part is formed, and the 1st farthest section of the leeward header part of the 1st header tank space Preliminary second space and the first space and the second space and the evaporator of claim 5, wherein there is a communication with sections adjacent to the farthest section. A casing having a ventilation path inside, a temperature adjustment section that is provided in the casing and adjusts the temperature of the air sent into the casing, and sends air to the ventilation path in the casing, and the temperature adjustment section performs temperature adjustment. A vehicle air conditioner having an evaporator disposed in a ventilation path in the casing, the evaporator of the temperature adjusting unit being defined in claims 1 to 6. And the evaporator is located on the upper side with respect to the other second header tank when viewed from the outside in the longitudinal direction of the header tank, and the leeward of the first header tank. A vehicle air conditioner in which the side header portion is disposed in an inclined state positioned above the windward header portion. An air heating section and a detour section that bypasses the air heating section are provided downstream of the evaporator in the ventilation path in the casing in the air flow direction, and the temperature adjustment section is provided in the air heating section of the ventilation path in the casing. 8. The vehicle air conditioner according to claim 7, further comprising: an arranged heater core; and an air mix damper that adjusts a ratio of an amount of air sent to the heater core after passing through the evaporator and an amount of air that bypasses the heater core after passing through the evaporator. apparatus.

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