JP5674376B2 - Evaporator - Google Patents

Description

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

  In the present specification and claims, the upper and lower sides of each drawing are referred to as the upper and lower sides.

  This type of evaporator includes a plurality of heat exchange tubes extending in the vertical direction, and upper and lower header portions through which both upper and lower ends of the heat exchange tubes are communicated. A rising path that flows from the bottom to the top in the heat exchange tube and a descending path that consists of a plurality of heat exchange tubes and the refrigerant flows from the top to the bottom in the heat exchange tube are provided, and the final path is the rising path or the falling path Ascending paths and descending paths are alternately arranged so that the refrigerant flowing in from the refrigerant inlet passes through all the paths and flows out of the refrigerant outlet. It has a plurality of path sets consisting of a descending path adjacent to the upstream side in the refrigerant flow direction, the total heat exchange tube of the ascending path constituting each path group, and the descending that constitutes each path group In an evaporator in which at least a part of the heat exchange tubes are arranged in a line, the heat exchange tubes are formed by arranging a plurality of heat exchange tubes at intervals in a direction perpendicular to the ventilation direction. Two tube rows are provided side by side in the direction of ventilation, the leeward tube row is provided with three or more tube groups comprising a plurality of heat exchange tubes, and the windward tube row is provided with a plurality of heat exchange tubes. 1 and less than the number of tube groups in the leeward side tube row, and the upper and lower ends of the heat exchange tubes in the leeward side and the windward side tube row are respectively located on the leeward side and the windward side upper and lower header portions. The leeward side upper and lower headers are provided with the same number of sections as the number of tube groups in the leeward side tube row, and each section has a leeward side tube. The heat exchange tubes of each tube group in the row are communicated, and the same number of partitions as the number of tube groups in the windward tube row are provided in the upper and lower header sections, and each tube of the windward tube row is provided in each partition. A group of heat exchange tubes are communicated, a refrigerant inlet is provided in one section of one of the leeward upper and lower header parts, and a refrigerant inlet of the leeward upper and lower header parts is provided. A refrigerant outlet is provided in the same end section as the refrigerant inlet in the header section on the same side as the leeward header section, and the refrigerant in the heat exchange tube of the farthest tube group located farthest from the refrigerant inlet in the leeward tube row The flow direction of the refrigerant and the flow direction of the refrigerant in the heat exchange tubes of the farthest tube group located farthest from the refrigerant outlet in the windward tube row are from top to bottom, One descending path is formed by the two farthest tube groups provided side by side in the ventilation direction, and one tube group provided adjacent to the downstream side in the refrigerant flow direction of the farthest tube group in the windward tube row. The refrigerant in the farthest section through which the descending path consisting of the two farthest tube groups and the ascending path constituting the path set are formed and the heat exchange tube of the farthest tube group of the windward tube row in the windward lower header section is communicated. The end portion on the side where the outlet is provided opens, and the heat exchange tubes of the tube group serving as the rising path constituting the path set in the upwind lower header portion lead to the adjacent section adjacent to the farthest section. The end opposite to the refrigerant outlet is open, the two compartments are communicated with each other through the opening, and the refrigerant flowing into the farthest compartment of the windward lower header part is cooled. Flows straight toward the outlet side provided, said is adapted to flow into the adjacent compartment evaporator has been proposed (see Patent Document 1).

  In general, in an evaporator used in a car air conditioner, in order to improve comfort in a vehicle interior of a vehicle equipped with a car air conditioner, the temperature of a blown air that has passed through a ventilation gap between adjacent heat exchange tubes is used. Although it is desired to make a certain discharge temperature uniform in each part of the evaporator, it is necessary to adjust the refrigerant distribution state of the refrigerant flowing in the evaporator.

  However, in the evaporator described in Patent Document 1, when the refrigerant flows into the adjacent section from the farthest section in the windward lower header portion, the refrigerant tends to flow to the downstream end side due to inertial force. At the same time, the amount of the refrigerant flowing in the heat exchange tube on the upstream side in the refrigerant flow direction of the rising path constituting the path set is reduced. Therefore, the amount of refrigerant flowing through the heat exchange tubes of the tube group that forms the ascending path together with the descending path becomes non-uniform, and the discharged air temperature becomes non-uniform in each part of the evaporator.

JP 2009-156532 A

  An object of the present invention is to solve the above-mentioned problem and to evenly distribute the refrigerant to the heat exchange tubes constituting the ascending path of the path set composed of the descending path and the ascending path adjacent to the downstream side in the refrigerant flow direction of the descending path. An object of the present invention is to provide an evaporator that can be transformed.

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

1) Equipped with a plurality of heat exchange tubes extending in the vertical direction and both upper and lower header parts through which both upper and lower ends of the heat exchange tubes are connected. Ascending path that flows from the bottom to the top and a descending path that consists of a plurality of heat exchange tubes and the refrigerant flows from the top to the bottom in the heat exchange tubes are provided so that the final path is an ascending path or a descending path The ascending path and the descending path are alternately arranged, and the refrigerant flowing in from the refrigerant inlet passes through all the paths and flows out from the refrigerant outlet, and the ascending path and the upstream of the rising path in the refrigerant flow direction A plurality of path sets each including a descending path adjacent to the side, and the heat exchange tubes of the ascending path constituting each path group and the heat exchange of at least a part of the descending path constituting each path group. The tube is a evaporator disposed in a row,
In the ascending path and the descending path constituting at least one path set, the ascending path in the descending path is arranged at the lower ends of a plurality of heat exchange tubes located on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the ascending path. The lower end portions of at least the plurality of heat exchange tubes located on the ascending path side among all the heat exchange tubes arranged in a line with the heat exchange tubes of the path are communicated, and the remaining heat exchange tubes of the ascending path of the lower end, it has been vented the remaining heat exchange tubes of the down path,
Two tube rows formed by arranging a plurality of heat exchange tubes at intervals in a direction perpendicular to the ventilation direction are provided in two rows along the ventilation direction. Three or more tube groups consisting of a plurality of heat exchange tubes are provided, and the tube group on the leeward side is provided with one less tube group than the number of tube groups of the leeward side tube row consisting of a plurality of heat exchange tubes, The upper and lower ends of the heat exchange tubes of the leeward and upper winder tube rows are respectively connected to the leeward and upper winder upper and lower header portions, and the leeward upper and lower header portions are connected to the tube group of the leeward tube row. The same number of compartments are provided, and the heat exchange tubes of each tube group of the leeward side tube row are communicated to each compartment, and the windward side upper and lower headers are provided with windward side tubes. The same number of compartments as the number of tube groups are provided, and the heat exchange tubes of each tube group of the windward side tube row are passed through each compartment, and in either one of the header parts on the leeward side upper and lower header parts A refrigerant inlet is provided in a section at one end, and a refrigerant outlet is provided in a section at the same end as the refrigerant inlet in the header part on the same side as the leeward header part provided with the refrigerant inlet of the upwind upper and lower header parts,
The flow direction of the refrigerant in the heat exchange tube of the farthest tube group farthest from the refrigerant inlet in the leeward tube row, and the heat exchange tube of the farthest tube group farthest from the refrigerant outlet in the windward tube row The flow direction of the refrigerant in the inside is from top to bottom, and one descending path is formed by two farthest tube groups arranged side by side in the ventilation direction, and the refrigerant of the farthest tube group in the windward tube row An ascending path that constitutes a descending path and a path set consisting of the two farthest tube groups is formed by one tube group provided adjacent to the downstream side in the flow direction,
In the section where the heat exchange tube of the farthest tube group of the windward lower tube section in the windward lower header section communicates, in the first space where the lower end of the heat exchange tube of the farthest tube group communicates, and in the leeward lower header section A second space communicating with the section through which the heat exchange tubes of the farthest tube group of the leeward side tube row communicate,
In the section where the heat exchange tubes of the tube group constituting the ascending path together with the descending path in the upwind lower header portion communicates, the upstream side of the total heat exchange tube in the ascending path is located on the upstream side in the refrigerant flow direction. A third space that communicates with the lower ends of the plurality of heat exchange tubes, and a fourth space that communicates with the lower ends of the plurality of remaining heat exchange tubes among the total heat exchange tubes in the rising path,
The first space and the third space and the second space and a fourth Eva space and are communicated with each porator.

2) A is the lower end of the refrigerant path of the heat exchange tube in which the lower end of the ascending path constituting the at least one path set communicates with the third space is A, and the lower end of the descending path constituting the path set together with the ascending path The evaporator according to 1) above, wherein B is a total passage cross-sectional area of the refrigerant passage of the heat exchange tube leading to the first space, where A ≧ 1 / 2B.

3) The total heat exchange tubes constituting the ascending path and the descending path have the same configuration, the number of refrigerant passages of these heat exchange tubes, and the cross-sectional area of the plurality of refrigerant passages of each heat exchange tube By adjusting the number of heat exchange tubes whose lower ends in the rising path communicate with the third space and the number of heat exchange tubes in which the lower end of the descending path communicates with the first space, the total is the same, The total passage sectional area of the refrigerant passage of the heat exchange tube whose lower end portion in the ascending path leads to the third space and the total passage sectional area of the refrigerant passage of the heat exchange tube whose lower end portion in the descending path leads to the first space are determined. The evaporator according to 2) above.

4) The third space and the fourth space are separated by a partition member that partitions the third space and the fourth space in the section through which the heat exchange tubes of the tube group that constitutes the rising path constituting the path set in the windward lower header portion. The evaporator according to any one of 1) to 3) above, in which a refrigerant passage hole is formed.

5) Three tube groups are provided in the leeward tube row and two tube groups are provided in the windward tube row, and the tube group located at the refrigerant outlet side end of the windward tube row serves as the ascending path. The evaporator according to any one of 1) to 4) , wherein the rising path is the final path.

6) Equipped with a plurality of heat exchange tubes extending in the vertical direction and both upper and lower header parts through which the upper and lower ends of the heat exchange tubes are communicated, consisting of a plurality of heat exchange tubes, and the refrigerant in the heat exchange tubes Ascending path that flows from the bottom to the top and a descending path that consists of a plurality of heat exchange tubes and the refrigerant flows from the top to the bottom in the heat exchange tubes are provided so that the final path is an ascending path or a descending path The ascending path and the descending path are alternately arranged, and the refrigerant flowing in from the refrigerant inlet passes through all the paths and flows out from the refrigerant outlet, and the ascending path and the upstream of the rising path in the refrigerant flow direction A plurality of path sets each including a descending path adjacent to the side, and the heat exchange tubes of the ascending path constituting each path group and the heat exchange of at least a part of the descending path constituting each path group. The tube is a evaporator disposed in a row,
In the ascending path and the descending path constituting at least one path set, the ascending path in the descending path is arranged at the lower ends of a plurality of heat exchange tubes located on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the ascending path. The lower end portions of at least the plurality of heat exchange tubes located on the ascending path side among all the heat exchange tubes arranged in a line with the heat exchange tubes of the path are communicated, and the remaining heat exchange tubes of the ascending path The remaining heat exchange tube of the descending path is passed through the lower end of
Two tube rows formed by arranging a plurality of heat exchange tubes at intervals in a direction perpendicular to the ventilation direction are provided in two rows along the ventilation direction. Two or more equal number of tube groups each having a plurality of heat exchange tubes are provided in the row, and the upper and lower end portions of the heat exchange tubes of the leeward side and the leeward side tube row are respectively provided on the leeward side and the leeward upper and lower header portions. The leeward side and the leeward upper and lower header sections are provided with the same number of sections as the number of tube groups of the leeward and leeward tube rows, respectively. The heat exchange tube of each tube group is allowed to pass through, and a refrigerant inlet is provided in a section at one end of either one of the leeward side upper and lower header parts, Refrigerant outlet is provided in the section of the refrigerant inlet and the same end of the upper vertical header section of the same side as the refrigerant inlet leeward header portion provided within the two header portions,
Half of the total tube groups each form an ascending path, and the other half of the tube groups each form a descending path. There is at least one path set,
In the section where the heat exchange tubes of the tube group forming the descending path of the at least one path group in the leeward side or the leeward side lower header part are located downstream of the total heat exchange tubes of the descending path in the refrigerant flow direction A first space that communicates with the lower ends of the plurality of heat exchange tubes and a second space that communicates with the lower ends of the remaining plurality of heat exchange tubes in the descending path,
In the section where the heat exchange tubes of the tube group that forms the ascending path together with the descending path on the leeward side or on the upwind lower header part, the upstream side in the refrigerant flow direction of the total heat exchange tube of the ascending path A third space that communicates with the lower end portions of the plurality of heat exchange tubes located in the fourth space, and a fourth space that communicates with the lower end portions of the remaining plurality of heat exchange tubes of the total heat exchange tubes in the rising path,
The first space and the third space and the second space and a fourth Eva space and are communicated with each porator.

7) C is the total passage cross-sectional area of the refrigerant passage of the heat exchange tube in which the lower end portion of the rising path constituting the at least one path set communicates with the third space, and the lower end portion of the lowering path constituting the path set together with the rising path The evaporator according to the above 6) , wherein D is the total passage cross-sectional area of the refrigerant passage of the heat exchange tube that communicates with the first space.

8) The total heat exchange tubes constituting the ascending path and the descending path have the same configuration, the number of refrigerant passages of these heat exchange tubes, and the cross-sectional area of the plurality of refrigerant passages of each heat exchange tube By adjusting the number of heat exchange tubes whose lower ends in the rising path communicate with the third space and the number of heat exchange tubes in which the lower end of the descending path communicates with the first space, the total is the same, The total passage sectional area of the refrigerant passage of the heat exchange tube whose lower end portion in the ascending path leads to the third space and the total passage sectional area of the refrigerant passage of the heat exchange tube whose lower end portion in the descending path leads to the first space are determined. The evaporator according to 7) above.

9) Two tube groups are provided for the leeward side and the windward side tube row, and the tube group located at the end of the refrigerant outlet side in the windward side tube row serves as an ascending path and is far from the refrigerant outlet in the windward side tube row. The evaporator according to any one of the above 6) to 8) , wherein a tube group at a position forms a descending path that forms a path set with the ascending path, and the ascending path is a final path.

According to the evaporators 1) to 9) , in the ascending path and the descending path constituting at least one path set, a plurality of heat exchanges located on the upstream side in the refrigerant flow direction of the total heat exchange tubes in the ascending path The lower end portions of the plurality of heat exchange tubes positioned on at least the rising path side of the total heat exchanging tubes arranged in a line with the heat exchanging tube of the ascending path in the descending path are passed through the lower end portion of the tube. Since the remaining heat exchange tubes of the descending path are communicated with the lower end portions of the remaining heat exchange tubes of the ascending path, the heat of the ascending path in the descending path constituting the path set together with the ascending path The refrigerant that has flowed through the plurality of heat exchange tubes located at least on the rising path side among the total heat exchange tubes aligned with the exchange tubes, The heat flows into the plurality of heat exchange tubes located upstream in the refrigerant flow direction among the total heat exchange tubes in the ascending path constituting the path set, and also flows through the remaining plurality of heat exchange tubes in the descending path. The refrigerant flows into the remaining plurality of heat exchange tubes in the rising path, that is, the heat exchange tubes on the upstream side in the refrigerant flow direction. Therefore, a relatively large amount of refrigerant is also sent to the heat exchange tube on the upstream side in the refrigerant flow direction in the ascending path, so that the refrigerant can be evenly distributed to the total heat exchange tube in the ascending path.

According to the evaporators 1) to 5) , the refrigerant that has flowed through the heat exchange tubes of the farthest tube group of the windward tube row that is the descending path of the path set passes through the first space and the third space. It enters a plurality of heat exchange tubes on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the tube group that constitutes the descending path and the ascending path constituting the path set. The refrigerant flowing through the heat exchange tube of the farthest tube group of the leeward tube row that becomes the descending path of the path set passes through the section of the leeward lower header section through which the heat exchange tube of the farthest tube group passes. The second plurality of heat exchange tubes among the total heat exchange tubes in the tube group that forms the second space and then passes through the fourth space and forms the ascending path and the path set, that is, the downstream of the refrigerant flow direction Enter heat exchange tube. Therefore, a relatively large amount of refrigerant is also sent to the heat exchange tube on the upstream side in the refrigerant flow direction in the ascending path, and the flow of the refrigerant to all the heat exchange tubes constituting the ascending path can be made uniform. it can.

According to the evaporator 2) , it is possible to effectively equalize the flow of the refrigerant to the total heat exchange tubes constituting the rising path.

According to the evaporator of 4) , when the remaining liquid refrigerant (remaining cold) is generated in the first space and the third space when the compressor is turned off, the remaining liquid refrigerant passes through the refrigerant passage hole and passes through the fourth passage. Since it flows into the space, the remaining liquid refrigerant can be reduced.

According to the evaporator 5) , it is possible to equalize the refrigerant flow to the total heat exchange tubes constituting the final path having the superheat region, and to improve the performance of the evaporator.

According to the evaporator of 6) , the refrigerant that has flowed through the plurality of heat exchange tubes located on the downstream side in the refrigerant flow direction of the tube group serving as the descending path of at least one path set passes through the first space and the third space. Then, it enters the heat exchange tube on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the tube group that forms the ascending path and the path combination. The refrigerant that has flowed through the remaining heat exchange tubes among the total heat exchange tubes in the tube group serving as the descending path, that is, the plurality of heat exchange tubes located on the upstream side in the refrigerant flow direction, The remaining plurality of heat exchange tubes among the total heat exchange tubes in the tube group that forms the ascending path and the ascending path that constitutes the path set pass through the fourth space, that is, the heat exchange tubes on the downstream side in the refrigerant flow direction. Therefore, a relatively large amount of refrigerant is also sent to the heat exchange tube on the upstream side in the refrigerant flow direction in the ascending path, and the flow of the refrigerant to all the heat exchange tubes constituting the ascending path can be made uniform. it can.

According to the evaporator of the above ( 7) , it is possible to effectively equalize the flow of the refrigerant to the heat exchange tube constituting the rising path.

According to the evaporator 9) , it is possible to equalize the flow of the refrigerant to the total heat exchange tube constituting the final path having the superheat region, and to improve the performance of the evaporator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to Embodiment 1 of the present invention. FIG. 2 is a perspective view schematically showing the configuration of the evaporator of FIG. 1 and showing the flow of refrigerant. FIG. 2 is a diagram corresponding to a cross section taken along line AA of FIG. 1 schematically showing the configuration of the evaporator of FIG. 1. It is a figure equivalent to the BB sectional view of Drawing 1 showing roughly the composition of the evaporator of Drawing 1. It is a figure equivalent to a part of FIG. 3 which shows the 1st modification of the windward lower header part of the evaporator of FIG. It is a figure equivalent to a part of FIG. 3 which shows the 2nd modification of the windward lower header part of the evaporator of FIG. It is a perspective view which shows the structure of the evaporator of Embodiment 2 of this invention, and shows the flow of a refrigerant | coolant. FIG. 8 is a view corresponding to a partially omitted vertical cross section of the leeward side upper and lower header portions schematically showing the configuration of the evaporator of FIG. FIG. 8 is a view corresponding to a partially omitted vertical cross section when the front is viewed from the rear in the windward upper and lower header portions schematically showing the configuration of the evaporator of FIG. 7.

  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 car air conditioner.

  Throughout the drawings, the same parts and the same parts are denoted by the same reference numerals, and redundant description is omitted.

  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 7) is the front, and the opposite side is the rear. The left and right sides of each drawing are referred to as the left and right sides.
Embodiment 1
This embodiment is shown in FIGS. FIG. 1 shows the overall configuration of the evaporator, and FIGS. 2 to 4 schematically show the configuration. 2 to 4, specific illustrations such as heat exchange tubes and fins are omitted.

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

  The first header tank (2) has a leeward header part (5) located on the leeward side (front side) and an upwind side located on the leeward side (rear side) and integrated with the leeward header part (5). And a header section (6). Here, the leeward header section (5) and the leeward header section (6) are provided by partitioning the first header tank (2) forward and backward by the partition section (2a). The second header tank (3) has a leeward header part (7) located on the leeward side (front side) and an upwind side located on the leeward side (rear side) and integrated with the leeward header part (7). And a header portion (8). Here, the leeward header section (7) and the leeward header section (8) are provided by dividing the second header tank (3) in the front and rear directions by the partition section (3a).

  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 (7) 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 (8) of the second header tank (3) is referred to as the upwind header section.

  The heat exchange core section (4) is a tube row (11) composed of a plurality of aluminum flat heat exchange tubes (9) that are oriented in the width direction in the ventilation direction and spaced in the left-right direction and extend in the up-down direction. ) (12) is provided in two rows in the front-rear direction, and the ventilation gap between adjacent heat exchange tubes (9) in each tube row (11) (12) and the heat exchange tubes (9) on both left and right ends Aluminum corrugated fins (13) are placed outside the front and rear tube rows (11) and (12) across the heat exchange tubes (9) and brazed to the heat exchange tubes (9). An aluminum side plate (14) is disposed on the outside of each corrugated fin (13) and brazed to the corrugated fin (13). The heat exchange tube (9) is made of an aluminum extruded profile and has a plurality of refrigerant passages arranged in the width direction. The upper and lower ends of the heat exchange tubes (9) of the leeward side tube row (11) are connected to the leeward side upper and lower header portions (5) and (7) in a continuous manner, and the heat exchange tubes of the leeward side tube row (12). The upper and lower end portions of (9) are connected to the windward upper and lower header portions (6) and (8) in a continuous manner. Note that the number of heat exchange tubes (9) in the leeward tube row (11) is equal to the number of heat exchange tubes (9) in the windward tube row (12). All the heat exchange tubes (9) have the same configuration, and the number of refrigerant passages of each heat exchange tube (9) and the total of the cross-sectional areas of the plurality of refrigerant passages of each heat exchange tube (9) are the same. It has become.

  As shown in FIGS. 2 to 4, in the leeward side tube row (11), three tube groups (11A) (11B) (11C) composed of a plurality of heat exchange tubes (9) are arranged from the right end to the left end. Are arranged side by side (from one end side to the other end side of the leeward side tube row (11)), and the windward side tube row (12) includes two fourth and fifth heat exchange tubes. Tube groups (12A) and (12B) (one less than the number of tube groups in the leeward tube row (11)) from the left end toward the right end (the other end side of the windward tube row (12)) To the one end side).

  The same number of tube groups (11A), (11B), and (11C) in the leeward side tube row (11) and the tube groups (11A) (11B) (11C) Sections (15), (16), (17) and (18), (19), and (21) through which the heat exchange tube (9) communicates are provided. A refrigerant inlet (22) is provided at the right end of the rightmost section (15) in the leeward side upper header (5). The three tube groups (11A), (11B), and (11C) in the leeward side tube row (11) are moved from the refrigerant inlet (22) side end (right end) toward the other end (left end). It is called the third tube group, and the sections (15) (16) (17) and (18) (19) (1) to (11A) (11B) (11C) through which the heat exchange tubes (9) are connected 21) is referred to as first to third sections from the refrigerant inlet (22) side end (right end) toward the other end (left end).

  The same number of tube groups (12A) (12B) in the windward tube row (12) and heat exchange tubes (12A) (12B) in the upwind upper and lower header sections (6) (8) (9) ) (23) (24) and (25) (26) are provided. A refrigerant outlet (27) is provided at the right end (the same end as the refrigerant inlet (22)) of the rightmost section (24) in the upwind header section (6). Then, the two tube groups (12A) and (12B) in the windward tube row (12) are moved from the end (left end) opposite to the refrigerant outlet (27) to the end (right end) of the refrigerant outlet side (27). 4) to 5th tube group, and the sections (23) (24) and (25) (26) through which the heat exchange tubes (9) of the 4th to 5th tube groups (12A) (12B) communicate Are the fourth to fifth sections from the end (left end) opposite to the refrigerant outlet (27) toward the end (right end) on the refrigerant outlet side (27).

  The total number of heat exchange tubes (9) constituting the first and second tube groups (11A) and (11B) of the leeward tube row (11) is the fifth tube group (12) of the leeward tube row (12). 12B) is equal to the number of heat exchange tubes (9), and the number of heat exchange tubes (9) constituting the third tube group (11C) of the leeward side tube row (11) is the windward side tube. It is equal to the number of heat exchange tubes (9) constituting the fourth tube group (12A) of the row (12). The total length in the left and right direction of the first section (15) (18) and the second section (16) (19) in the leeward upper and lower header sections (5) and (7) is the leeward upper and lower header sections ( 6) The length in the left-right direction of the fifth section (24) (26) in (8) is the same as the length in the left-right direction, and the length in the left-right direction of the third section (17) (21) in the upper and lower header sections (5) (7) This is equal to the length in the left-right direction of the fourth section (23) (25) in the upwind upper and lower header sections (6) (8).

  A partition wall (33) is provided between the first section (15) and the second section (16) of the leeward side upper header section (5), so that the sections (15) and (16) are not in communication with each other. It has become. In addition, the left end of the second section (16) of the leeward upper header section (5) (the end opposite to the refrigerant inlet (22)) is open, and the right end of the third section (17) ( The end of the refrigerant inlet (22) side is open, and the second section (16) and the third section (17) are in communication with each other through the opening.

  The left end (end opposite to the refrigerant inlet (22)) of the first section (18) of the leeward lower header section (7) is open, and the right end (refrigerant inlet) of the second section (19). (The end on the (22) side) is open, whereby the first section (18) and the second section (19) are in communication. Further, a partition wall (34) is provided between the second section (19) and the third section (21) of the leeward side lower header section (7), so that both sections (19) and (21) are not Communication is established.

  A partition wall (35) is provided between the fourth section (23) and the fifth section (24) of the upwind header section (6), so that the sections (23) and (24) are not in communication with each other. It has become. The fourth section (25) and the fifth section (26) of the windward lower header section (8) are in communication with each other, and the refrigerant flows straight to the right from the fourth section (25) to the fifth section (25). It flows into the compartment (26).

  The third section (17) of the leeward upper header section (5) and the fourth section (23) of the leeward upper header section (6) are provided in the partition section (2a) of the first header tank (2). It is made to communicate by the connected communication part (37). The third section (21) of the leeward lower header section (7) and the fourth section (25) of the leeward lower header section (8) are divided into the partition section (3a) of the second header tank (3). It is made to communicate by the communication part (38) provided in.

  As described above, the compartments (15) (16) (17) (18) (19) (21) (23) (24) (25), the refrigerant inlet (22), the refrigerant outlet (27) and the communication part (37 ) (38) is provided, the refrigerant flows from top to bottom in the heat exchange tubes (9) of the first tube group (11A), the third tube group (11C), and the fourth tube group (12A). In the second tube group (11B) and the fifth tube group (12B), the heat exchange tubes (9) flow from the bottom to the top. The first tube group (11A) is a first path (28) that is a descending path in which the refrigerant flows from top to bottom, and the second tube group (11B) is a rising path in which the refrigerant flows from bottom to top. 2 passes (29), the 3rd and 4th tube groups (11C) (12A) become the 3rd pass (31) which is a descending pass through which the refrigerant flows from top to bottom, and the 5th tube group (12B) The fourth path (32) (final path) is a rising path flowing from the bottom to the top. That is, the third path (31), which is the descending path, includes the third tube group (11C) (the farthest tube group) located farthest from the refrigerant inlet (22) in the leeward side tube row (11), and the windward side. The fourth tube group (12A) (the farthest tube group) located farthest from the refrigerant outlet (27) in the tube row (12) is arranged side by side in the ventilation direction.

  Therefore, the evaporator (1) includes a plurality of heat exchange tubes (9) and a rising path that flows from the bottom to the inside of the heat exchange tubes (9) and a plurality of heat exchange tubes (9) and heat exchange. The descending path flowing from the top to the bottom in the tube (9) is alternately arranged so that the fourth path (32) as the final path becomes the ascending path, and the refrigerant flow direction in the descending path and the descending path A plurality of sets of paths composed of ascending paths adjacent to the downstream side are provided. That is, the first path (28) and the second path (29), and the third path (31) and the fourth path (32) constitute a path set.

  The refrigerant flowing from the refrigerant inlet (22) into the first section (15) of the leeward upper header section (5) is transferred to the first section (18) and the second section (7) of the leeward lower header section (7). 19) and the second section (16) of the leeward upper header section (5) and then flows into the third section (17). Part of the refrigerant flowing into the third section (17) flows into the fourth section (25) of the leeward lower header section (8) through the third section (21) of the leeward lower header section (7). To do. Further, the remaining refrigerant flowing into the third section (17) of the leeward upper header section (5) passes through the fourth section (23) of the leeward upper header section (6) and reaches the leeward lower header section (8). Into the fourth section (25). The refrigerant that has flowed into the fourth section (25) of the windward lower header section (8) passes through the fifth section (26) of the windward lower header section (8), and the fifth section of the windward upper header section (6). It flows into (24) and flows out from the refrigerant outlet (27).

  In the 4th section (25) where the heat exchange tube (9) of the 4th tube group (12A) which constitutes the 3rd path (31) in the windward lower header part (8) leads, the 4th section (25) concerned The inside is divided into an upper first space (41) facing the heat exchange tube (9) of the fourth tube group (12A) and a lower second space (42) separated from the first space (41). A plate-like partition member (43) for partitioning is provided. The communication part (38) that allows the third section (21) and the fourth section (25) to pass through is provided below the partition member (43), and the third section (21) and the fourth section (25) are provided. ) In the second space (42). Thus, in the fourth section (25), the first space (41) through which the lower end of the heat exchange tube (9) of the fourth tube group (12A) communicates, and the leeward side tube in the leeward side lower header part (7). A second space (42) communicating with the third section (21) through which the heat exchange tube (9) of the third tube group (11C), which is the farthest tube group of the row (11), is provided. Note that the flow of the refrigerant from the third section (21) to the first space (41) of the fourth section (25) is blocked by the function of the partition section (3a).

  Further, the fifth section in the fifth section (26) through which the heat exchange tube (9) of the fifth tube group (12B) constituting the fourth path (32) in the upwind lower header section (8) communicates. (26), the lower ends of a plurality of heat exchange tubes (9) located upstream in the flow direction of the total heat exchange tubes (9) of the fifth tube group (12B) constituting the fourth path (32) A fourth space (45) through which the lower ends of the third space (44) through which the part communicates and the remaining heat exchange tubes (9) of the total heat exchange tubes (9) in the fifth tube group (12B) communicate with each other. A partition member (46) is provided to divide it into The partition member (46) is connected to the right end of the partition member (43) in the fourth compartment (25) and extends straight to the right and the first portion (46a) and the right end of the first portion (46a). A second part (46b) which extends upward and has an upper end abutting against the upper wall of the windward lower header part (8) and closing the right end of the space between the upper wall and the first part (46a); It becomes more. The right end opening of the first space (41) of the fourth section (25) leads to the left end opening of the third space (44) of the fifth section (26), and the right end opening of the second space (42) is the first opening. By communicating with the left end opening of the four spaces (45), the first space (41), the third space (44), and the second space (42) leading to the third section (21) of the leeward lower header portion (7) ) And the fourth space (45) are communicated with each other.

  As a result, at least one of two sets of paths consisting of an ascending path and a descending path adjacent to the upstream side of the rising path in the refrigerant flow direction, here the fourth path (32) and the third path (31). A plurality of heat exchanges located upstream in the refrigerant flow direction of the total heat exchange tubes (9) in the fifth tube group (12B) constituting the fourth path (32) which is the ascending path. The fifth tube group of the total heat exchange tubes (9) in the third and fourth tube groups (11C) (12A) constituting the third path (31) which is the lowering path at the lower end of the tube (9) The heat exchange tube (9) of (12B) and the heat exchange tube (9) arranged in a line, that is, the lower end of the total heat exchange tube (9) of the fourth tube group (12A) are connected, The remaining plurality of heat exchange tubes of the total heat exchange tubes (9) in the fifth tube group (12B) constituting the fourth path (32). A plurality of remaining heat exchange tubes (9) of the total heat exchange tubes (9) in the third and fourth tube groups (11C) (12A) constituting the third path (31) are provided at the lower end of the tube (9). 9) That is, the lower end portion of the total heat exchange tube (9) of the third tube group (11C) is communicated.

  Here, the total passage of the refrigerant passage of the heat exchange tube (9) in which the lower end portion of the fifth tube group (12B) constituting the fourth path (32) communicates with the third space (44) of the fifth section (26). The cross-sectional area is A, the lower end portion of the fourth tube group (12A) constituting the third path (31) is connected to the first space (41) of the fourth section (25) and the refrigerant passage of the heat exchange tube (9). When the total passage cross-sectional area is B, it is preferable that the relationship of A ≧ 1 / 2B is satisfied.

  All the heat exchange tubes (9) have the same configuration, and the total number of refrigerant passages of each heat exchange tube (9) and the passage cross-sectional areas of the plurality of refrigerant passages of each heat exchange tube (9) are Since it is the same, the lower end portion of the fifth tube group (12B) has the number of heat exchange tubes (9) leading to the third space (44) of the fifth section (26), and the fourth tube group (12A). The total passage cross-sectional areas A and B of the refrigerant passages described above are determined by adjusting the number of heat exchange tubes (9) in which the lower end of the refrigerant leads to the first space (41) of the fourth section (25). .

  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 car air conditioner. The gas-liquid mixed phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve passes through the refrigerant inlet (22) and enters the first section (15) of the leeward upper header section (5). The refrigerant that has entered the first section (15) includes the first tube group (11A) constituting the first path (28), and the first and second sections (18) and (19) of the leeward lower header section (7). ), The second tube group (11B) constituting the second path (29), and the second section (16) of the leeward side upper header section (5) to flow into the third section (17). Part of the refrigerant flowing into the third section (17) passes through the communication section (37) and enters the fourth section (23) of the upwind header section (6), and passes through the third path (31). It flows into the heat exchange tube (9) of the fourth tube group (12A) to be configured. At the same time, the remaining refrigerant flowing into the third section (17) flows into the heat exchange tube (9) of the third tube group (11C) constituting the third path (31).

  The refrigerant that has flowed into the heat exchange tube (9) of the fourth tube group (12A) constituting the third path (31) flows downward in the heat exchange tube (9) to reach the windward lower header portion (8). The fifth tube constituting the fourth path (32) after entering the first space (41) of the fourth section (25) of the second section and further entering the third space (44) of the fifth section (26). The lower end of the group (12B) flows into the heat exchange tube (9) communicating with the third space (44). At the same time, the refrigerant flowing into the heat exchange tube (9) of the third tube group (11C) constituting the third path (31) flows downward in the heat exchange tube (9) and flows down the leeward lower header. After entering the third section (21) of the section (7), passing through the rear communication section (38) and entering the second space (42) of the fourth section (25) of the upwind lower header section (8), Further, after entering the fourth space (45) of the fifth section (26), the lower end of the fifth tube group (12B) constituting the fourth path (32) communicates with the fourth space (45). It flows into the exchange tube (9).

  Therefore, a relatively large amount of refrigerant is also sent to the heat exchange tube (9) on the upstream side in the refrigerant flow direction in the fifth tube group (12B) constituting the fourth path (32). ) Can be made uniform to the total heat exchange tube (9) of the fifth tube group (12B). In particular, the total passage disconnection of the refrigerant passage of the heat exchange tube (9) in which the lower end portion of the fifth tube group (12B) constituting the fourth path (32) communicates with the third space (44) of the fifth section (26). The total area of the refrigerant passage of the heat exchange tube (9) where the area is A and the lower end of the fourth tube group (12A) constituting the third path (31) communicates with the first space (41) of the fourth section (25). Assuming that the cross-sectional area of the passage is B, if the relationship A ≧ 1 / 2B is satisfied, the refrigerant flows into the total heat exchange tube (9) of the fifth tube group (12B) constituting the fourth path (32). The shunt flow can be made uniform effectively.

  The refrigerant that has flowed into the total heat exchange tube (9) of the fifth tube group (12B) constituting the fourth path (32) flows upward in the heat exchange tube (9) to reach the windward upper header portion (6 ) Enters the fifth compartment (26) and flows out through the refrigerant outlet (27).

  While the refrigerant flows in the heat exchange tube (9) of the leeward tube row (11) and in the heat exchange tube (9) of the windward tube row (12), the ventilation of the heat exchange core section (4) Heat exchange is performed with air passing through the gap (see arrow X in FIG. 1), the air is cooled, and the refrigerant flows out as a gas phase.

  5 and 6 show a modification of the windward lower header portion of the evaporator (1).

  In the case of the upwind lower header portion (8) shown in FIG. 5, the first portion (46a) of the partition member (46) that divides the fifth section (26) into a third space (44) and a fourth space (45). ) Is provided with a refrigerant passage hole (50) that allows the third space (44) and the fourth space (45) to pass therethrough.

  In the case of the windward lower header portion (8) shown in FIG. 6, the second portion (46b) of the partition member (46) that divides the fifth section (26) into the third space (44) and the fourth space (45). ) Is provided with a refrigerant passage hole (51) that allows the third space (44) and the fourth space (45) to pass therethrough.

The hole area of these refrigerant passage holes (50), (51) is the area ratio with respect to the total passage cross-sectional area of the heat exchange tube (9) of the fourth tube group (12A) leading to the first space (41). It is preferable that it is 0.5 to 8%.
Embodiment 2
This embodiment is shown in FIGS. 7 to 9 schematically show the configuration of the evaporator, and specific illustrations such as heat exchange tubes and fins are omitted.

  As shown in FIGS. 7 to 9, in the leeward tube row (11) of the evaporator (60), two tube groups (11 D) and (11 E) composed of a plurality of heat exchange tubes (9) are arranged from the right end to the left end. Toward the other side (from one end side to the other end side of the leeward side tube row (11)), and the windward side tube row (12) is provided with two pieces of heat exchange tubes (9) ( The tube group (12D) (12E) of the leeward tube row (11) is the same number as the tube group (from the other end side of the windward tube row (12) toward the one end side). It is provided side by side.

  The same number of tube groups (11D) (11E) in the leeward tube row (11) and heat exchange tubes (11D) (11E) in the leeward upper and lower header sections (5) (7) (9 ) (61) (62) and (63) (64) are provided. A refrigerant inlet (22) is provided at the right end of the right section (61) in the leeward upper header section (5). The two tube groups (11D) and (11E) in the leeward tube row (11) are referred to as first and second tube groups from the refrigerant inlet (22) side end toward the other end, and the first and second tubes. First and second sections (61), (62) and (63), (64) through which the heat exchange tubes (9) of the groups (11D) (11E) are communicated from the refrigerant inlet (22) side end toward the other end. It shall be called 2 sections.

  The same number of tube groups (12D) (12E) in the windward tube row (12) and heat exchange tubes (12D) (12E) in the upwind upper and lower header sections (6) (8) (9) (65) (66) and (67) (68) are provided. A refrigerant outlet (27) is provided at the right end (the same end as the refrigerant inlet (22)) of the right section (66) in the upwind header section (6). The third and fourth tubes of the two tube groups (12D) and (12E) of the windward side tube row (12) from the end opposite to the refrigerant outlet (27) toward the end of the refrigerant outlet (27). The section (65) (66) and (67) (68) through which the heat exchange tubes (9) of the third and fourth tube groups (12D) and (12E) lead are opposite to the refrigerant outlet (27). It is assumed that the third and fourth sections are directed from the end portion toward the end portion on the refrigerant outlet side (27).

  The number of heat exchange tubes (9) constituting the first and second tube groups (11D) (11E) of the leeward side tube row (11) is the same as that of the fourth and third sides of the leeward side tube row (12). It is equal to the number of heat exchange tubes (9) constituting the tube group (12E) (12D). The lengths of the first section (61) (63) and the second section (62) (64) in the leeward upper and lower header sections (5) and (7) in the left-right direction are the leeward upper and lower header sections (6 ) (8) is equal to the length in the left-right direction of the fourth section (68) and the third section (67).

  A partition wall (69) is provided between the first section (61) and the second section (62) of the leeward side upper header section (5), so that the sections (61) and (62) are not in communication with each other. It has become. In addition, the left end of the first section (63) of the leeward side lower header section (7) is opened and the right end of the second section (64) is opened, thereby the first section (63). And the second section (64) are in communication with each other through the opening.

  A partition wall (71) is provided between the third section (65) and the fourth section (66) of the windward upper header section (6), so that the sections (65) and (66) are not in communication with each other. It has become. The third section (67) and the fourth section (68) of the windward lower header section (8) are in communication with each other, and the refrigerant flows straight to the right from the third section (67) to the fourth section (67). It flows into the compartment (26).

  The second section (62) of the leeward upper header section (5) and the third section (65) of the leeward upper header section (6) are provided in the partition section (2a) of the first header tank (2). The communication part (72) is connected.

  As described above, the sections (61) (62) (63) (64) (65) (66) (67) (68), the refrigerant inlet (22), the refrigerant outlet (27), and the communication part (72) are provided. As a result, the refrigerant flows through the heat exchange tubes (9) of the first tube group (11D) and the third tube group (12D) from top to bottom, and the second tube group (11E) and the fourth tube group ( Flows from bottom to top in the heat exchange tube (9) of 12E). The first tube group (11D) is a first path (73) that is a descending path in which the refrigerant flows from the top to the bottom, and the second tube group (11E) is a rising path in which the refrigerant flows from the bottom to the top. 2 passes (74), the 3rd tube group (12D) becomes the 3rd pass (75) which is a descending path in which the refrigerant flows from top to bottom, and the fourth tube group (12E) rises in which the coolant flows from the bottom to the top This is the fourth pass (76) (final pass), which is a pass.

  Therefore, the evaporator (60) includes a plurality of heat exchange tubes (9) and a rising path that flows from the bottom to the top in the heat exchange tubes (9) and a plurality of heat exchange tubes (9) and heat exchange. The descending path flowing from the top to the bottom in the tube (9) is alternately arranged so that the fourth path (76) as the final path is the ascending path, and the refrigerant flow direction of the descending path and the descending path is A plurality of sets of paths composed of ascending paths adjacent to the downstream side are provided. That is, the first path (73) and the second path (74), and the third path (75) and the fourth path (76) constitute a path set.

  Then, the refrigerant flowing into the first section (61) of the leeward upper header section (5) from the refrigerant inlet (22) flows into the first section (63) and the second section (of the leeward lower header section (7)). 64), second section (62) of the leeward upper header section (5), third section (65) of the leeward upper header section (6), third section (67) of the leeward lower header section (8) And it flows in into the 4th division (66) of a windward upper header part (6) through a 4th division (68), and flows out from a refrigerant | coolant exit (27).

  In the third section (67) where the heat exchange tube (9) of the third tube group (12D) constituting the third path (75) in the upwind lower header section (8) communicates, the third section (67) The first space (77) through which the lower ends of a plurality of heat exchange tubes (9) located on the downstream side (right side) in the flow direction among the total heat exchange tubes (9) of the third tube group (12D) communicate And a partition member (79) divided into a second space (78) through which the lower ends of the remaining heat exchange tubes (9) of the total heat exchange tubes (9) of the third tube group (12D) communicate. Is provided. The partition member (79) includes a first part (79a) that divides the third section (67) vertically, and extends upwardly from the left end of the first part (79a), and the upper end is an upwind header. It consists of a second part (79b) that contacts the upper wall of the part (8) and closes the left end of the space between the upper wall and the first part (79a).

  Further, the fourth section (68) in the fourth section (68) through which the heat exchange tube (9) of the fourth tube group (12E) constituting the fourth path (76) in the upwind lower header section (8) communicates. 68) A third space (in which all the heat exchange tubes (9) of the fourth tube group (12E) communicate with the lower ends of the plurality of heat exchange tubes (9) located upstream (left side) in the flow direction. 81) and a partition member (83) divided into the fourth space (82) through which the lower ends of the plurality of remaining heat exchange tubes (9) of the total heat exchange tubes (9) of the fourth tube group (12E) communicate. ) Is provided. The partition member (83) is connected to the right end of the first portion (79a) of the partition member (79) in the third section (67) and extends straight to the right and vertically in the fourth section (68). A first part (83a) to be divided and a right end part of the first part (83a) are extended upward, and an upper end abuts against an upper wall of the windward lower header part (8) and the upper wall and the first part The second portion (83b) closes the right end of the space between the portion (83a). The right end opening of the first space (77) of the third section (67) communicates with the left end opening of the third space (81) of the fourth section (68), and the right end opening of the second space (78) is the second opening. By communicating with the left end opening of the four spaces (82), the first space (77) and the third space (81), and the second space (78) and the fourth space (82) are communicated with each other.

  As a result, at least one of two sets of paths consisting of an ascending path and a descending path adjacent to the upstream side in the refrigerant flow direction of the ascending path, here the fourth path (76) and the third path (75). A plurality of heat exchanges located upstream in the refrigerant flow direction of the total heat exchange tubes (9) in the fourth tube group (12E) constituting the fourth pass (76) that is the ascending pass. Heat exchange of the 4th tube group (12E) of the total heat exchange tubes (9) in the 3rd tube group (12D) which comprises the 3rd path | pass (75) which is a downward path | pass at the lower end part of a tube (9) A plurality of heat exchange tubes (9) on the downstream side in the refrigerant flow direction aligned with the tubes (9) are connected to each other, and all the fourth tube groups (12E) constituting the fourth path (76) are also connected. A third path (75) is formed at the lower end of the remaining heat exchange tubes (9) of the heat exchange tubes (9). Cube groups remaining plurality of heat exchange tubes (9) of the total heat exchange tubes in (12D) (9) is vented.

  Here, the total passage of the refrigerant passage of the heat exchange tube (9) in which the lower end portion of the fourth tube group (12E) constituting the fourth path (76) communicates with the third space (81) of the fourth section (68). C is the cross-sectional area, and the lower end of the third tube group (12D) constituting the third path (75) is connected to the first space (77) of the third section (67) of the refrigerant passage of the heat exchange tube (9). When the total passage cross-sectional area is D, it is preferable that the relationship C ≧ D is satisfied.

  All the heat exchange tubes (9) have the same configuration, and the total number of refrigerant passages of each heat exchange tube (9) and the passage cross-sectional areas of the plurality of refrigerant passages of each heat exchange tube (9) are Since it is the same, the lower end portion of the fourth tube group (12E) is the number of heat exchange tubes (9) leading to the third space (81) of the fourth section (68), and the third tube group (12D) The total passage sectional areas C and D of the refrigerant passages described above are determined by adjusting the number of heat exchange tubes (9) in which the lower end portion of the refrigerant leads to the first space (77) of the third section (67). .

  The evaporator (60) 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 car air conditioner. The gas-liquid mixed-phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve passes through the refrigerant inlet (22) and enters the first section (61) of the leeward upper header section (5). The refrigerant that has entered the first section (61) includes the first tube group (11D) constituting the first path (73), the first and second sections (63) and (64) of the leeward lower header section (7). ), And enters the second section (62) of the leeward upper header section (7) through the second tube group (11E) constituting the second path (74).

  The refrigerant that has entered the second section (62) passes through the communication section (72) and enters the third section (65) of the upwind header section (6) to form the third path (75). It flows into the heat exchange tube (9) of the tube group (12D).

  The refrigerant that has flowed into the plurality of heat exchange tubes (9) on the downstream side (right side) in the refrigerant flow direction in the third tube group (12D) constituting the third path (75) moves downward in the heat exchange tubes (9). Into the first space (77) of the third section (67) of the windward lower header section (8), and further into the third space (81) of the fourth section (68), The lower end portion of the fourth tube group (12E) constituting the four paths (76) flows into the heat exchange tube (9) communicating with the third space (81). At the same time, the refrigerant flowing into the remaining heat exchange tubes (9) of the third tube group (12D) constituting the third path (75) flows downward in the heat exchange tubes (9) to the windward side. After entering the second space (78) of the third section (67) of the lower header section (8) and further entering the fourth space (82) of the fourth section (68), the fourth path (76) is taken. The lower end portion of the fourth tube group (12E) to be configured flows into the heat exchange tube (9) communicating with the fourth space (82).

  Therefore, a relatively large amount of refrigerant is also sent to the heat exchange tube (9) on the upstream side in the refrigerant flow direction in the fourth tube group (12E) constituting the fourth path (76), and the fourth path (76 ) Can be made uniform to the total heat exchange tube (9) of the fourth tube group (12E). Particularly, the total passage disconnection of the refrigerant passage of the heat exchange tube (9) in which the lower end portion of the fourth tube group (12E) constituting the fourth path (76) communicates with the third space (81) of the fourth section (68). The total area of the refrigerant passage of the heat exchange tube (9) where the area is C and the lower end portion of the third tube group (12D) constituting the third path (75) communicates with the first space (77) of the third section (67). When the cross-sectional area of the passage is D, if the relationship of C ≧ D is satisfied, it is possible to effectively equalize the refrigerant flow to the fourth tube group (12E) constituting the fourth path (76). it can.

  The refrigerant that has flowed into the total heat exchange tube (9) of the fourth tube group (12E) constituting the fourth path (76) flows upward in the heat exchange tube (9) to reach the windward upper header portion (6 ) Enters the fourth compartment (66) and flows out through the refrigerant outlet (27).

  While the refrigerant flows in the heat exchange tube (9) of the leeward tube row (11) and in the heat exchange tube (9) of the windward tube row (12), the ventilation of the heat exchange core section (4) Heat exchange is performed with air passing through the gap (see arrow X in FIG. 1), the air is cooled, and the refrigerant flows out as a gas phase.

  In the evaporator according to the present invention, a plurality of flat hollow bodies formed by brazing the peripheral portions with a pair of plate-shaped plates facing each other are arranged in parallel, and are lined up in the ventilation direction in each flat hollow body. Two heat exchange tubes that extend in the vertical direction, and header forming parts that lead to the upper and lower ends of both heat exchange tubes are provided, and flat hollow so that the two upper and lower header forming parts of all flat hollow bodies can communicate with each other When the bodies are brazed to each other, two rows of tube rows each including a plurality of heat exchange tubes extending in the vertical direction and spaced apart in a direction perpendicular to the ventilation direction are provided side by side in the ventilation direction. In addition, both the leeward and leeward upper and lower headers where the upper and lower ends of the leeward and upper winder tube rows communicate with each other by the flat hollow body header forming portion. Is also applicable to form a so-called laminated evaporator provided.

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

(1) (60): Evaporator
(5): First header tank leeward header (leeward upper header)
(6): Windward header section of the first header tank (windward upper header section)
(7): The leeward header of the second header tank (leeward lower header)
(8): Windward header part of the second header tank (windward lower header part)
(9): Heat exchange tube
(11): Downward tube row
(11A) (11B) (11C): First to third tube groups
(11D) (11E): First and second tube groups
(12): Windward tube row
(12A) (12B): Fourth and fifth tube groups
(12D) (12E): 3rd and 4th tube groups
(15) (16) (17): First to third sections of the leeward upper header section
(18) (19) (21): First to third sections of the leeward lower header section
(22): Refrigerant inlet
(23) (24): 4th and 5th section of upwind header section
(25) (26): Fourth and fifth sections of the upwind header section
(27): Refrigerant outlet
(28) (29) (31) (32): 1st to 4th pass
(41): 1st space
(42): 1st space
(44): Third space
(45): Fourth space
(46): Partition member
(50) (51): Refrigerant passage hole
(61) (62): First and second sections of the leeward upper header section
(63) (64): First and second sections of the leeward lower header section
(65) (66): Third and fourth sections of upwind header section
(67) (68): Third and fourth sections of the upwind header section
(73) (74) (75) (76): 1st to 4th pass
(77): 1st space
(78): Second space
(81): Third space
(82): Fourth space

Claims (9)

It is equipped with a plurality of heat exchange tubes extending in the vertical direction and upper and lower header parts through which both upper and lower ends of the heat exchange tubes are connected. The heat exchange tubes are composed of a plurality of heat exchange tubes, and the refrigerant passes through the heat exchange tubes. An ascending path that flows from the top to the bottom, and a descending path that is composed of a plurality of heat exchange tubes and in which the refrigerant flows from the top to the bottom in the heat exchange tube, and the final path is the ascending path or the descending path And the descending path are alternately arranged, and the refrigerant flowing in from the refrigerant inlet passes through all the paths and flows out from the refrigerant outlet, and the ascending path and the upstream of the rising path in the refrigerant flow direction. A plurality of sets of paths composed of adjacent descending paths are provided, and all heat exchange tubes of ascending paths constituting each path set and heat exchange of at least a part of descending paths constituting each path group And cube is a evaporator disposed in a row,
In the ascending path and the descending path constituting at least one path set, the ascending path in the descending path is arranged at the lower ends of a plurality of heat exchange tubes located on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the ascending path. The lower end portions of at least the plurality of heat exchange tubes located on the ascending path side among all the heat exchange tubes arranged in a line with the heat exchange tubes of the path are communicated, and the remaining heat exchange tubes of the ascending path of the lower end, it has been vented the remaining heat exchange tubes of the down path,
Two tube rows formed by arranging a plurality of heat exchange tubes at intervals in a direction perpendicular to the ventilation direction are provided in two rows along the ventilation direction. Three or more tube groups consisting of a plurality of heat exchange tubes are provided, and the tube group on the leeward side is provided with one less tube group than the number of tube groups of the leeward side tube row consisting of a plurality of heat exchange tubes, The upper and lower ends of the heat exchange tubes of the leeward and upper winder tube rows are respectively connected to the leeward and upper winder upper and lower header portions, and the leeward upper and lower header portions are connected to the tube group of the leeward tube row. The same number of compartments are provided, and the heat exchange tubes of each tube group of the leeward side tube row are communicated to each compartment, and the windward side upper and lower headers are provided with windward side tubes. The same number of compartments as the number of tube groups are provided, and the heat exchange tubes of each tube group of the windward side tube row are passed through each compartment, and in either one of the header parts on the leeward side upper and lower header parts A refrigerant inlet is provided in a section at one end, and a refrigerant outlet is provided in a section at the same end as the refrigerant inlet in the header part on the same side as the leeward header part provided with the refrigerant inlet of the upwind upper and lower header parts,
The flow direction of the refrigerant in the heat exchange tube of the farthest tube group farthest from the refrigerant inlet in the leeward tube row, and the heat exchange tube of the farthest tube group farthest from the refrigerant outlet in the windward tube row The flow direction of the refrigerant in the inside is from top to bottom, and one descending path is formed by two farthest tube groups arranged side by side in the ventilation direction, and the refrigerant of the farthest tube group in the windward tube row An ascending path that constitutes a descending path and a path set consisting of the two farthest tube groups is formed by one tube group provided adjacent to the downstream side in the flow direction,
In the section where the heat exchange tube of the farthest tube group of the windward lower tube section in the windward lower header section communicates, in the first space where the lower end of the heat exchange tube of the farthest tube group communicates, and in the leeward lower header section A second space communicating with the section through which the heat exchange tubes of the farthest tube group of the leeward side tube row communicate,
In the section where the heat exchange tubes of the tube group constituting the ascending path together with the descending path in the upwind lower header portion communicates, the upstream side of the total heat exchange tube in the ascending path is located on the upstream side in the refrigerant flow direction. A third space that communicates with the lower ends of the plurality of heat exchange tubes, and a fourth space that communicates with the lower ends of the plurality of remaining heat exchange tubes among the total heat exchange tubes in the rising path,
An evaporator in which a first space and a third space, and a second space and a fourth space are communicated with each other. The lower end of the rising path that constitutes the at least one path set has a total cross-sectional area of the refrigerant passage of the heat exchange tube that leads to the third space A, and the lower end of the lower path that constitutes the path set together with the rising path is the first. The evaporator according to claim 1, wherein when the total passage cross-sectional area of the refrigerant passage of the heat exchange tube leading to one space is B, the relationship of A ≧ 1 / 2B is satisfied . The total heat exchange tubes constituting the ascending path and the descending path have the same configuration, and the total number of refrigerant passages of these heat exchange tubes and the passage cross-sectional areas of the plurality of refrigerant passages of each heat exchange tube are By adjusting the number of heat exchange tubes that are the same and the lower end portion of the rising path leads to the third space, and the number of heat exchange tubes that the lower end portion of the descending path leads to the first space, the rise The total passage cross-sectional area of the refrigerant passage of the heat exchange tube where the lower end portion in the path leads to the third space, and the total passage cross-sectional area of the refrigerant passage of the heat exchange tube where the lower end portion in the descending path leads to the first space are determined. evaporator according to claim 2, wherein there. A partition member that partitions the third space and the fourth space in the section through which the heat exchange tubes of the tube group that constitutes the rising path constituting the path set in the upwind lower header portion passes through the third space and the fourth space. The evaporator according to any one of claims 1 to 3, wherein a refrigerant passage hole is formed . Three tube groups are provided in the leeward tube row and two tube groups are provided in the windward tube row, and the tube group located at the refrigerant outlet side end of the windward tube row serves as the ascending path, The evaporator according to any one of claims 1 to 4, wherein the rising path is a final path . It is equipped with a plurality of heat exchange tubes extending in the vertical direction and upper and lower header parts through which both upper and lower ends of the heat exchange tubes are connected. The heat exchange tubes are composed of a plurality of heat exchange tubes, and the refrigerant passes through the heat exchange tubes. An ascending path that flows from the top to the bottom, and a descending path that is composed of a plurality of heat exchange tubes and in which the refrigerant flows from the top to the bottom in the heat exchange tube, and the final path is the ascending path or the descending path And the descending path are alternately arranged, and the refrigerant flowing in from the refrigerant inlet passes through all the paths and flows out from the refrigerant outlet, and the ascending path and the upstream of the rising path in the refrigerant flow direction. A plurality of sets of paths composed of adjacent descending paths are provided, and all heat exchange tubes of ascending paths constituting each path set and heat exchange of at least a part of descending paths constituting each path group And cube is a evaporator disposed in a row,
In the ascending path and the descending path constituting at least one path set, the ascending path in the descending path is arranged at the lower ends of a plurality of heat exchange tubes located on the upstream side in the refrigerant flow direction among the total heat exchange tubes in the ascending path. The lower end portions of at least the plurality of heat exchange tubes located on the ascending path side among all the heat exchange tubes arranged in a line with the heat exchange tubes of the path are communicated, and the remaining heat exchange tubes of the ascending path The remaining heat exchange tube of the descending path is passed through the lower end of
Two tube rows formed by arranging a plurality of heat exchange tubes at intervals in a direction perpendicular to the ventilation direction are provided in two rows along the ventilation direction. Two or more equal number of tube groups each having a plurality of heat exchange tubes are provided in the row, and the upper and lower end portions of the heat exchange tubes of the leeward side and the leeward side tube row are respectively provided on the leeward side and the leeward upper and lower header portions. The leeward side and the leeward upper and lower header sections are provided with the same number of sections as the number of tube groups of the leeward and leeward tube rows, respectively. The heat exchange tube of each tube group is allowed to pass through, and a refrigerant inlet is provided in a section at one end of either one of the leeward side upper and lower header parts, Refrigerant outlet is provided in the section of the refrigerant inlet and the same end of the upper vertical header section of the same side as the refrigerant inlet leeward header portion provided within the two header portions,
Half of the total tube groups each form an ascending path, and the other half of the tube groups each form a descending path. There is at least one path set,
In the section where the heat exchange tubes of the tube group forming the descending path of the at least one path group in the leeward side or the leeward side lower header part are located downstream of the total heat exchange tubes of the descending path in the refrigerant flow direction A first space that communicates with the lower ends of the plurality of heat exchange tubes and a second space that communicates with the lower ends of the remaining plurality of heat exchange tubes in the descending path,
In the section where the heat exchange tubes of the tube group that forms the ascending path together with the descending path on the leeward side or on the upwind lower header part, the upstream side in the refrigerant flow direction of the total heat exchange tube of the ascending path A third space that communicates with the lower end portions of the plurality of heat exchange tubes located in the fourth space, and a fourth space that communicates with the lower end portions of the remaining plurality of heat exchange tubes of the total heat exchange tubes in the rising path,
An evaporator in which a first space and a third space, and a second space and a fourth space are communicated with each other . The lower end part of the refrigerant path of the heat exchange tube in which the lower end part of the rising path constituting the at least one path set communicates with the third space is C, and the lower end part of the lowering path constituting the path set together with the rising path is the first part. The evaporator according to claim 6, wherein the total passage cross-sectional area of the refrigerant passage of the heat exchange tube communicating with one space is D, and satisfies the relationship C ≧ D. The total heat exchange tubes constituting the ascending path and the descending path have the same configuration, and the total number of refrigerant passages of these heat exchange tubes and the passage cross-sectional areas of the plurality of refrigerant passages of each heat exchange tube are By adjusting the number of heat exchange tubes that are the same and the lower end portion of the rising path leads to the third space, and the number of heat exchange tubes that the lower end portion of the descending path leads to the first space, the rise The total passage cross-sectional area of the refrigerant passage of the heat exchange tube where the lower end portion in the path leads to the third space, and the total passage cross-sectional area of the refrigerant passage of the heat exchange tube where the lower end portion in the descending path leads to the first space are determined. evaporator according to claim 7, wherein there. Two tube groups are provided for each of the leeward side and the windward side tube row, and the tube group located at the end of the refrigerant outlet side in the windward side tube row serves as an ascending path and is located far from the refrigerant outlet in the windward side tube row. The evaporator according to any one of claims 6 to 8, wherein a certain tube group is a descending path that constitutes a path pair with the ascending path, and the ascending path is a final path .

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