JP2016023815A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of unifying the amount of refrigerant flowing in a plurality of refrigerant passages arranged side by side in a width direction of heat exchanging tubes.SOLUTION: An evaporator 1 comprises rows 13 of downstream tubes and rows 14 of upstream tubes composed of a plurality of flat heat exchanging tubes 12. The rows 13 of downstream tubes have a group 13A of descending flow tubes and the rows 14 of upstream tubes have a group 14A of ascending flow tubes. An upper header part 5 of downstream side is provided with an inlet side segment 5a in which refrigerant flows into the heat exchanging tubes 12 of the group 13A of descending flow tubes of the rows 13 of downstream tubes. A lower header part 11 of upstream side is provided with an inlet side segment 11b in which refrigerant flows into the heat exchanging tubes 12 of the group 14A of ascending flow tubes. End portions of the segments inserted into the inlet side segments 5a and 11b at the heat exchanging tubes 12 in the group 13A of descending flow tubes and the group 14A of ascending flow tubes are inclined downward to the upstream side.SELECTED DRAWING: Figure 2

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.

  As an evaporator that can be reduced in size, weight, and performance, the present applicant has previously made a plurality of flats arranged at intervals from each other in a state where the longitudinal direction is directed in the vertical direction and the width direction is directed in the wind direction. Two tube rows that are formed of a cylindrical heat exchange tube and are arranged side by side in the ventilation direction, and are arranged with the longitudinal direction facing the tube arrangement direction on both ends in the longitudinal direction of the heat exchange tubes of the leeward side tube row, and The first header part and the second header part to which both ends in the longitudinal direction of the tubes of the leeward side tube row are connected, and the longitudinal direction toward the both ends in the longitudinal direction of the heat exchange tubes of the windward side tube row, are directed in the tube arrangement direction. And a third header part and a fourth header part connected to both longitudinal ends of the tubes of the leeward side tube row, and the heat exchange tubes are arranged in the ventilation direction. The evaporator has a plurality of refrigerant passages, and a fixed length portion near both ends of the heat exchange tube is inserted into the header portion, and the heat exchange tube is disposed on the entire first header portion and the fourth header portion. An inlet side section into which the refrigerant flows is provided, and an outlet side section from which the refrigerant flows out of the heat exchange tube is provided in the entire second header part and third header part, and the inside of the inlet side section in the heat exchange tube The end of the inserted portion is positioned on a plane perpendicular to the longitudinal direction of the heat exchange tube, and the first to fourth header portions are divided into two upper and lower spaces by a partition plate, and below the second header portion. An evaporator has been proposed in which the side space communicates with the lower space of the fourth header portion, and through holes are formed in the partition plate of each header portion so as to pass through the upper and lower spaces (see Patent Document 1).

  In the evaporator described in Patent Document 1, the flow of the first tube row and the second tube row to the total heat exchange tubes is divided by the action of the partition plate that divides the inside of each header portion up and down and the through holes formed in the partition plate. The heat exchange performance is thereby improved.

  By the way, in the evaporator described in Patent Document 1, in the refrigerant passage on the windward side of each heat exchange tube, the evaporation of the refrigerant is promoted compared to the refrigerant passage on the leeward side, so that the passage resistance increases, and the refrigerant passage on the windward side It becomes difficult for the refrigerant to flow into the inside, and variations occur in the temperatures on the windward side and the leeward side of each heat exchange tube. Therefore, a relatively large difference occurs between the temperature distribution on the windward side and the temperature distribution on the leeward side of the evaporator, resulting in variations in cooling performance, and further improvement in heat exchange performance cannot be achieved.

JP 2008-232456 A

  An object of the present invention is to provide an evaporator that can solve the above problems and can equalize the amount of refrigerant flowing in a plurality of refrigerant passages arranged in the width direction of each heat exchange tube.

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

1) Heat exchange between at least one tube row composed of a plurality of flat heat exchange tubes arranged at intervals from each other in a state where the longitudinal direction is directed vertically and the width direction is directed to the ventilation direction And at least two header portions arranged at both ends in the longitudinal direction of the tubes with the longitudinal direction facing the arrangement direction of the tubes and connected to both longitudinal ends of the tubes of the tube row, and the heat exchange tube It has a plurality of refrigerant passages arranged in the ventilation direction, a fixed length portion near both ends of the heat exchange tube is inserted into the header portion, and at least one header portion has an entry side section into which the refrigerant flows into the heat exchange tube A heat exchanger provided,
The evaporator in which the edge part of the part inserted in the entrance side division in a heat exchange tube inclines below toward the windward side.

2) The first tube row and the second tube row made up of a plurality of flat heat exchange tubes arranged with the longitudinal direction facing the vertical direction are arranged in the ventilation direction so that the first tube row is located on the leeward side. A first header portion and a second header portion, to which the total heat exchange tubes of the first tube row are connected, are provided on both upper and lower ends of the heat exchange tubes of the first tube row, and heat exchange of the second tube row is performed. A third header portion and a fourth header portion, to which the total heat exchange tubes of the second tube row are connected, are provided on both upper and lower ends of the tube,
The first tube row is composed of a plurality of heat exchange tubes arranged continuously, and has a downflow tube group in which the refrigerant flows from top to bottom in the heat exchange tube, and the second tube row is arranged continuously. The upflow tube group is composed of a plurality of heat exchange tubes and the refrigerant flows from the bottom to the top in the heat exchange tubes, and the downflow tube group of the first tube row is the leeward side of the upflow tube group of the second tube row Located in the
The upper end portion of the heat exchange tube of the downflow tube group of the first tube row is connected to the first header portion, and an entry side section into which the refrigerant flows into the heat exchange tube of the downflow tube group is provided. The lower end part of the heat exchange tube of the upflow tube group of the second tube row is connected to the 4 header part, and an entrance side section into which the refrigerant flows into the heat exchange tube of the upflow tube group is provided. The ends of the portions inserted in the inlet side sections of the heat exchange tubes of the downflow tube group of the tube row and the heat exchange tubes of the upflow tube group of the second tube row are inclined downward toward the windward side. The evaporator according to 1) above.

3) In the first tube row, the downflow tube group and the upflow tube group consisting of a plurality of continuously arranged heat exchange tubes and in which the refrigerant flows from the bottom to the top in the heat exchange tube are alternately arranged. The upward flow tube groups and the downward flow tube groups in which the refrigerant flows from the top to the bottom in the heat exchange tubes are alternately arranged in the second tube row. The downflow tube group of the first tube row is located on the leeward side of the upflow tube group of the second tube row, and the upflow tube group of the first tube row is the downflow tube group of the second tube row. Located on the leeward side of
The second header portion is connected to the lower end portion of the upflow tube group of the first tube row, and is provided with an entry side section through which the refrigerant flows into the heat exchange tube of the upflow tube group. The upper end portion of the heat exchange tube of the downflow tube group of the second tube row is connected, and an entrance side section into which the refrigerant flows into the heat exchange tube of the downflow tube group is provided, and the first tube row rises. The end of the portion inserted into the inlet section of the heat exchange tube of the flow tube group and the heat exchange tube of the downflow tube group of the second tube row is inclined downward toward the windward side 2) The described evaporator.

4) One tube row consisting of a plurality of flat heat exchange tubes arranged with the longitudinal direction facing the vertical direction is provided, and the total heat exchange tubes of the tube row are provided on both upper and lower ends of the heat exchange tubes of the tube row. A connected first header portion and a second header portion are provided;
The tube row is composed of a plurality of heat exchange tubes arranged continuously and the downflow tube group in which the refrigerant flows from the top to the bottom in the heat exchange tube, and the plurality of heat exchange tubes arranged in series and the refrigerant is And an upflow tube group that flows from the bottom to the top in the heat exchange tube,
The first header portion is connected to the upper end portion of the heat exchange tube of the downflow tube group, and is provided with an entry side section into which the refrigerant flows into the heat exchange tube of the downflow tube group, and the second header portion, The lower end portion of the heat exchange tube of the upflow tube group is connected, and an inlet side section into which the refrigerant flows into the heat exchange tube of the upflow tube group is provided, and the heat exchange tube and the upflow tube of the downflow tube group The evaporator according to 1) above, wherein an end of a portion inserted into the entrance side section of the heat exchange tube of the group is inclined downward toward the windward side.

  According to the evaporators 1) to 4) above, since the end of the portion inserted into the entry side compartment in the heat exchange tube is inclined downward toward the windward side, the heat exchange tube from the entry side compartment The amount of the refrigerant flowing through the plurality of refrigerant passages arranged in the width direction can be made uniform. That is, the liquid phase refrigerant is easily stored in the lower part of the entry side section of the upper header part, but a fixed length portion near the upper end of the heat exchange tube in which the refrigerant flows from the top to the bottom is inserted into the entry side section, If the upper end of the heat exchange tube is inclined downward toward the windward side, the liquid refrigerant stored in the lower part of the entry side section of the upper header portion flows into the refrigerant passage on the windward side located below. The amount of refrigerant flowing into the leeward refrigerant passage located below becomes larger than the amount of refrigerant flowing into the leeward refrigerant passage located above. Further, the liquid-phase refrigerant is easily stored in the lower portion of the entry side section of the lower header portion, but a fixed length portion near the lower end of the heat exchange tube in which the refrigerant flows from the bottom to the top is inserted in the entry side section. When the lower end of the heat exchange tube is inclined downward toward the windward side, the liquid-phase refrigerant stored in the lower part of the entry side section of the lower header portion is placed in the refrigerant path on the windward side located below. It becomes easy to flow in, and the amount of refrigerant flowing into the refrigerant passage on the leeward side located below is larger than the amount of refrigerant flowing into the refrigerant passage on the leeward side located above. Therefore, even if the passage resistance of the refrigerant passage on the windward side of the heat exchange tube is increased as compared with the refrigerant passage on the leeward side, the refrigerant easily flows into the refrigerant passage on the windward side, and the windward side of each heat exchange tube The amount of the refrigerant flowing through the refrigerant passage and the leeward refrigerant passage is made uniform, and the occurrence of variations in the temperatures on the windward side and the leeward side of each heat exchange tube is suppressed. As a result, it is possible to suppress a relatively large difference between the temperature distribution on the windward side and the temperature distribution on the leeward side of the evaporator, thereby preventing a large variation in the cooling performance and improving the heat exchange performance. It becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view schematically showing an overall configuration of an evaporator according to Embodiment 1 of the present invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a partially notched perspective view which shows roughly the whole structure of the evaporator of Embodiment 2 by this invention. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG.

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

  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 each figure) is referred to as the front, the opposite side is referred to as the rear, and the front is viewed from the rear. The left and right sides (left and right in FIG. 1) are called left and right.

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

In addition, the same code | symbol is attached | subjected to the same thing and the same part through all drawings.
Embodiment 1
This embodiment is shown in FIGS.

  FIG. 1 schematically shows the overall configuration of an evaporator according to Embodiment 1 of the present invention, and FIGS. 2 and 3 show the configuration of the main part thereof.

  In FIG. 1, the evaporator (1) includes an aluminum upper header tank (2) and an aluminum lower header tank (3) which are arranged in the vertical direction and spaced apart from each other, and both header tanks (2) ( And 3) a heat exchange core portion (4) provided between them.

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

  As shown in FIGS. 1 to 3, the leeward upper header portion (5) of the upper header tank (2) has a right compartment (5a) connected to the refrigerant inlet (7) by an aluminum leeward partition plate (17). ) And the left section (5b). Inside the windward upper header section (6), the windward partition plate (18) provided at the same position as the windward partition plate (17), the left partition (6a) and the right partition that leads to the refrigerant outlet (8) It is divided into (6b). The left section (5b) of the leeward upper header section (5) and the left section (6a) of the leeward upper header section (6) are both upper header sections (5) (6) in the upper header tank (2). It communicates via a communication hole (19) formed in a partition (2a) that is provided in the left and right direction and that is long in the left-right direction. The leeward lower header part (9) and the leeward lower header part (11) are not divided by the partition plate, but the right part in the leeward lower header part (9) is the right compartment (9a). And the left part in the upwind lower header (11) is the left part (11a), and the right part is the right part (11b).

  The heat exchange core part (4) is a flat heat exchange tube made of a plurality of aluminum extruded sections arranged at intervals in the left-right direction with the longitudinal direction oriented in the vertical direction and the width direction directed in the ventilation direction ( Two tube rows (13) and (14) consisting of 12) are arranged in the front-rear direction, and the ventilation gap between the adjacent heat exchange tubes (12) of each tube row (13) and (14) and the left and right Aluminum corrugated fins (15) are arranged outside the heat exchange tubes (12) at both ends so as to straddle the heat exchange tubes (12) of both the front and rear tube rows (13) and (14). ), And aluminum side plates (16) are disposed on the outer sides of the corrugated fins (15) at both the left and right ends, respectively, and brazed to the corrugated fins (15). The heat exchange tube (12) has a plurality of refrigerant passages (12a) arranged in the ventilation direction.

  The upper and lower ends of the heat exchange tubes (12) of the leeward tube row (13) (first tube row) are both inserted so as to protrude into the leeward upper and lower header portions (5) and (9). The upper and lower ends of the heat exchange tubes (12) of the upwind tube row (14) (second tube row) are connected to the header sections (5) and (9) in a continuous manner. (11) It is connected to both header parts (6) and (11) in a state of being inserted so as to protrude into (11). The number of heat exchange tubes (12) in the leeward tube row (13) is equal to the number of heat exchange tubes (12) in the windward tube row (14). The corrugated fin (15) is shared by the heat exchange tubes (12) before and after the leeward tube row (13) and the windward tube row (14).

  One downflow tube group (13A) consisting of a plurality of heat exchange tubes (12) arranged in a row on the leeward side tube row (13) and in which the refrigerant flows from top to bottom in the heat exchange tubes (12). And a plurality of heat exchange tubes (12) arranged side by side, and an upflow tube group (13B) in which the refrigerant flows from the bottom to the top in the heat exchange tubes (12) are provided side by side in the left-right direction. . Consecutive with an upflow tube group (14A) consisting of a plurality of heat exchange tubes (12) arranged continuously in the windward tube row (14) and in which the refrigerant flows from the bottom to the top in the heat exchange tubes (12). A plurality of downflow tube groups (14B), which are composed of a plurality of heat exchange tubes (12) arranged in parallel and from which the refrigerant flows from top to bottom in the heat exchange tubes (12), are provided alternately. The downflow tube group (13A) of the leeward tube row (13) is located on the leeward side of the upflow tube group (14A) of the upwind tube row (14), and the upflow tube of the leeward tube row (13). The group (13B) is located on the leeward side of the downflow tube group (14B) in the windward tube row (14).

  The upper end of the heat exchange tube (12) of the downflow tube group (13A) in the leeward tube row (13) leads to the right compartment (5a) of the leeward upper header (5), and the lower end is on the leeward lower side. It leads to the right section (9a) of the header section (9). The upper end of the heat exchange tube (12) of the upflow tube group (13B) in the leeward tube row (13) communicates with the left compartment (5b) of the leeward upper header (5), and the lower end is leeward. It leads to the left section (9b) of the lower header section (9). The upper end of the heat exchange tube (12) of the upflow tube group (14A) in the upwind tube row (14) communicates with the right compartment (6b) of the upwind header (6), and the lower end of the upwind tube group (14A) It leads to the right section (11b) of the header section (11). In addition, the upper end of the heat exchange tube (12) of the downflow tube group (14B) of the upwind tube row (14) communicates with the left compartment (6a) of the upwind upper header (6), and the lower end of the heat exchange tube (12). It leads to the left section (11a) of the upper lower header section (11).

  Here, the right section (5a) of the leeward upper header section (5), the left section (9b) of the leeward lower header section (9), the left section (6a) of the leeward upper header section (6), and the windward side The right section (11b) of the lower header section (11) is an entry section into which the refrigerant flows into the heat exchange tube (12), and the portion inserted into the entry section of the heat exchange tube (12). The end portion is inclined downward toward the windward side. That is, the upper end of the heat exchange tube (12) of the downflow tube group (13A) of the leeward side tube row (13), the lower end of the heat exchange tube (12) of the upflow tube group (13B), and the upwind side The lower end of the heat exchange tube (12) of the upflow tube group (14A) of the tube row (14) and the upper end of the downflow tube group (14B) of the upwind tube row (14) face the upwind side, respectively. And tilted downward. In this embodiment, the lower end of the heat exchange tube (12) of the downflow tube group (13A) of the leeward side tube row (13) and the heat exchange tube (12) of the upflow tube group (13B). The upper end and the upper end of the heat exchange tube (12) of the upflow tube group (14A) of the upwind tube row (14) and the lower end of the downflow tube group (14B) of the upwind tube row (14) are also provided. These are inclined downward toward the windward side in order to make all the heat exchange tubes (12) have the same shape and reduce the types of parts.

  In the evaporator (1) described above, the refrigerant that has passed through the compressor, the condenser, and the expansion valve enters the right compartment (5a) of the leeward upper header portion (5) from the refrigerant inlet (7), and the right compartment (5a). The air flows into the heat exchange tubes (12) of the downflow tube group (13A) in the leeward tube row (13). The refrigerant that has flowed into the heat exchange tube (12) of the downflow tube group (13A) flows downward in the heat exchange tube (12) and into the right compartment (9a) of the leeward lower header section (9). After entering, it enters the left compartment (9a) and flows from the left compartment (9a) into the heat exchange tube (12) of the upflow tube group (13B) of the leeward tube row (13). The refrigerant flowing into the heat exchange tube (12) of the upflow tube group (13B) flows upward in the heat exchange tube (12) and enters the left compartment (5b) of the leeward upper header section (5). Into the left compartment (6a) of the windward upstream header section (9) through the communication hole (19), and from the left compartment (6a) to the downflow tube group (14B) of the windward tube row (14). It flows into the heat exchange tube (12). The refrigerant flowing into the heat exchange tube (12) of the downflow tube group (14B) flows downward in the heat exchange tube (12) and enters the left compartment (11a) of the windward lower header portion (11). After entering, enter the right compartment (11b). The refrigerant that has entered the right side section (11b) of the upwind header section (11) flows into the heat exchange tube (12) of the upflow tube group (14A) of the upwind tube row (14), and the heat It flows upward in the exchange tube (12), enters the right compartment (6b) of the upwind header section (6), and flows out from the refrigerant outlet (8).

  Liquid refrigerant is stored in the lower section of the right section (5a) of the leeward upper header section (5) and the left section (6a) of the leeward upper header section (6), which are the inlet section of the header section located on the upper side. Although it is easy, the fixed length part near the upper end of the heat exchange tube (12) of the downflow tube group (13A) (14B) in which the refrigerant flows from top to bottom is inserted into the right compartment (5a) and the left compartment (6a). Since the upper end of the heat exchange tube (12) is inclined downward toward the windward side, the right partition (5a) of the leeward upper header part (5) and the left partition of the windward upper header part (6) (6a) The liquid refrigerant stored in the lower part of the refrigerant becomes easy to flow into the windward refrigerant passage (12a) located below, and the amount of refrigerant flowing into the windward refrigerant passage (12a) located below However, it becomes larger than the amount of refrigerant flowing into the leeward refrigerant passage (12a) located above.

  Further, the liquid-phase refrigerant is supplied to the left side section (9b) of the leeward side lower header part (9) and the right side section (11b) of the leeward side lower header part (11), which is an entrance side section of the header part located on the lower side. Although it is easy to accumulate in the lower part, the fixed length part near the lower end of the heat exchange tube (12) of the upflow tube group (13B) (14A) where the refrigerant flows from the bottom to the top is in the left compartment (9b) and the right compartment (11b) ) And the lower end of the heat exchange tube (12) is inclined downward toward the windward side, so the left side section (9b) of the leeward lower header part (9) and the windward lower header part ( 11) The liquid-phase refrigerant stored in the lower portion of the right compartment (11b) easily flows into the windward refrigerant passage (12a) located below, and enters the refrigerant passage (12a) located on the windward side below. The amount of refrigerant flowing into the refrigerant becomes larger than the amount of refrigerant flowing into the leeward refrigerant passage (12a) located above.

  Therefore, in the windward side refrigerant passage (12a) of each heat exchange tube (12), even when the evaporation of the refrigerant is promoted and the passage resistance is increased as compared with the leeward side refrigerant passage (12a), The refrigerant easily flows into the refrigerant passage (12a), and the amount of refrigerant flowing through the windward refrigerant passage (12a) and the leeward refrigerant passage (12a) of each heat exchange tube (12) is made uniform. As a result, the occurrence of variations in the temperature on the leeward and leeward sides of each heat exchange tube (12) is suppressed, and a relatively large difference between the temperature distribution on the leeward side and the temperature distribution on the leeward side of the evaporator (1). It is possible to improve the heat exchange performance without the occurrence of a large variation in the cooling performance.

In the evaporator (1) of Embodiment 1 described above, the lower end of the heat exchange tube (12) of the downflow tube group (13A) of the leeward side tube row (13) and the heat exchange tube of the upflow tube group (13B) The upper end of (12), the upper end of the heat exchange tube (12) of the upflow tube group (14A) of the windward tube row (14), and the downflow tube group (14B) of the windward tube row (14) Each of the lower end portions of each of them may not be inclined downward toward the windward side, and may be horizontal.
Embodiment 2
This embodiment is shown in FIGS.

  FIG. 4 schematically shows the entire configuration of the evaporator according to the second embodiment of the present invention, and FIGS. 5 and 6 show the configuration of the main part thereof.

  4 to 6, the evaporator (20) includes an aluminum upper header portion (21) (first header portion) and an aluminum lower header portion (22) extending in the left-right direction and spaced apart in the vertical direction. (Second header portion) and a heat exchange core portion (23) provided between the header portions (21) and (22).

  A refrigerant inlet (24) is provided at the right end of the upper header (21), and a refrigerant outlet (25) is provided at the left end. The upper header portion (21) is divided into a right compartment (21a) leading to the refrigerant inlet (24) and a left compartment (21b) leading to the refrigerant outlet (25) by an aluminum partition plate (26). . Although the lower header portion (9) is not divided by a partition plate, the right side portion in the lower header portion (22) is a right side partition (22a) and the left side portion is a left side partition (22b). To do.

  The heat exchange core part (23) is a flat heat exchange tube made of a plurality of extruded aluminum shapes (a plurality of aluminum extruded shape members arranged at intervals in the left-right direction with the longitudinal direction oriented in the vertical direction and the width direction directed in the ventilation direction ( 12) is provided with one tube row (27), and a ventilation gap between adjacent heat exchange tubes (12) in the tube row (27) and outside the heat exchange tubes (12) at both left and right ends, respectively. Aluminum corrugated fins (15) are arranged and brazed to the heat exchange tubes (12), and aluminum side plates (16) are arranged outside the corrugated fins (15) at the left and right ends, respectively. It is comprised by brazing to. The heat exchange tube (12) has a plurality of refrigerant passages (12a) arranged in the ventilation direction.

  The upper and lower ends of the heat exchange tube (12) in the tube row (27) communicate with both header sections (21) and (22) in a state of being inserted so as to protrude into the upper and lower header sections (21) and (22). Connected.

  The tube row (27) is composed of a plurality of heat exchange tubes (12) arranged in succession, and one downflow tube group (27A) in which the refrigerant flows from the top to the bottom in the heat exchange tube (12). And an upflow tube group (27B) which is composed of a plurality of heat exchange tubes (12) arranged side by side and in which the refrigerant flows from the bottom to the top in the heat exchange tube (12).

  The upper end of the downflow tube group (27A) of the tube row (27) communicates with the right compartment (21a) of the upper header section (21), and the lower end communicates with the right section (22a) of the lower header section (22). ing. Further, the upper end portion of the upward flow tube group (27B) of the tube row (27) communicates with the left compartment (21b) of the upper header portion (21), and the lower end portion is the left compartment (22b) of the lower header portion (22). Leads to.

  Here, the right section (21a) of the upper header section (21) and the left section (22b) of the lower header section (22) are entry sections into which the refrigerant flows into the heat exchange tube (12). The end of the portion of the exchange tube (12) inserted into the entry compartment is inclined downward toward the windward side. That is, the upper end of the heat exchange tube (12) of the downflow tube group (27A) of the tube row (27) and the lower end of the heat exchange tube (12) of the upflow tube group (27B) are respectively on the windward side. It is inclined downward. In this embodiment, the lower end of the heat exchange tube (12) of the downflow tube group (27A) of the tube row (27) and the upper end of the heat exchange tube (12) of the upflow tube group (27B) are also provided. These are inclined downward toward the windward side in order to make all the heat exchange tubes (12) have the same shape and reduce the types of parts.

  In the evaporator (20) described above, the refrigerant that has passed through the compressor, the condenser, and the expansion valve enters the right compartment (21a) of the upper header portion (21) from the refrigerant inlet (24), and the tube from the right compartment (21a). It flows into the heat exchange tubes (12) of the downflow tube group (27A) in the row (27). The refrigerant that has flowed into the heat exchange tube (12) of the downflow tube group (27A) flows downward through the heat exchange tube (12) and enters the right compartment (22a) of the lower header portion (22). It enters the rear left compartment (22b) and flows from the left compartment (22b) into the heat exchange tube (12) of the upward flow tube group (27B) in the tube row (27). The refrigerant that has flowed into the heat exchange tube (12) of the upflow tube group (27B) flows upward in the heat exchange tube (12) and enters the left compartment (21b) of the upper header portion (21). It flows out from the refrigerant outlet (25).

  The liquid refrigerant is easily stored in the lower part of the right side section (21a) of the upper header part (21) that is the entrance side section of the header part located on the upper side, but the downflow tube group (27A) in which the refrigerant flows from top to bottom The fixed length portion near the upper end of the heat exchange tube (12) is inserted into the right section (21a), and the upper end of the heat exchange tube (12) is inclined downward toward the windward side, so The liquid-phase refrigerant stored in the lower portion of the right section (21a) of the header section (21) is likely to flow into the windward refrigerant passage (12a) located below, and the windward refrigerant passage (lower) ( The amount of refrigerant flowing into 12a) is larger than the amount of refrigerant flowing into the leeward refrigerant passage (12a) located above.

  Further, the liquid phase refrigerant is easily stored in the lower part of the left side section (22b) of the lower header part (22) which is the entry side section of the header part located on the lower side, but the upward flow tube group in which the refrigerant flows from the bottom to the top A fixed length portion near the lower end of the heat exchange tube (12) of (27B) is inserted into the left compartment (22b), and the lower end of the heat exchange tube (12) is inclined downward toward the windward side. Therefore, the liquid refrigerant stored in the lower part of the left section (22b) of the lower header part (22) is likely to flow into the windward refrigerant passage (12a) located below, and the windward refrigerant located below is located on the windward side. The amount of refrigerant flowing into the refrigerant passage (12a) is larger than the amount of refrigerant flowing into the leeward refrigerant passage (12a) located above.

  Therefore, in the windward side refrigerant passage (12a) of each heat exchange tube (12), even when the evaporation of the refrigerant is promoted and the passage resistance is increased as compared with the leeward side refrigerant passage (12a), The refrigerant easily flows into the refrigerant passage (12a), and the amount of refrigerant flowing through the windward refrigerant passage (12a) and the leeward refrigerant passage (12a) of each heat exchange tube (12) is made uniform. As a result, the occurrence of variations in the temperature on the leeward and leeward sides of each heat exchange tube (12) is suppressed, and there is a relatively large difference between the temperature distribution on the leeward side and the temperature distribution on the leeward side of the evaporator (20). It is possible to improve the heat exchange performance without the occurrence of a large variation in the cooling performance.

  In the evaporator (20) of the second embodiment described above, the lower end of the heat exchange tube (12) of the downflow tube group (27A) of the tube row (27) and the heat exchange tube (12 of the upflow tube group (27B)) ) Are not necessarily inclined downward toward the windward side, and may be horizontal.

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

(1): Evaporator
(5): Downward upper header (first header)
(5a): Right section (entrance section)
(6): Upwind header section (third header section)
(6a): Left compartment (entrance compartment)
(9); Downward lower header (second header)
(9b): Left section (entrance section)
(11): Upwind lower header (fourth header)
(11b): Right section (entrance section)
(12): Heat exchange tube
(12a): Refrigerant passage
(13): Downward tube row (first tube row)
(13A): Downflow tube group
(13B): Upflow tube group
(14): Windward tube row
(14A): Upflow tube group
(14B): Downflow tube group
(20): Evaporator
(21): Upper header (first header)
(21a): Right section (entrance section)
(22): Lower header (second header)
(22b): Left compartment (entrance compartment)
(27): Tube row
(27A): Downflow tube group
(27B): Upflow tube group

Claims (4)

At least one tube row composed of a plurality of flat heat exchange tubes arranged at intervals in a state where the longitudinal direction is directed in the vertical direction and the width direction is directed in the ventilation direction, and the heat exchange tubes of each tube row The heat exchange tube is provided with at least two header portions arranged at both ends in the longitudinal direction so that the longitudinal direction is directed in the tube arranging direction and connected to both ends in the longitudinal direction of the tubes in the tube row. A fixed length portion near both ends of the heat exchange tube is inserted into the header portion, and at least one header portion is provided with an entry side section into which the refrigerant flows into the heat exchange tube. A heat exchanger,
The evaporator in which the edge part of the part inserted in the entrance side division in a heat exchange tube inclines below toward the windward side. A first tube row and a second tube row composed of a plurality of flat heat exchange tubes arranged with the longitudinal direction directed in the vertical direction are provided side by side in the ventilation direction so that the first tube row is located on the leeward side. The first header portion and the second header portion to which the total heat exchange tubes of the first tube row are connected are provided on the upper and lower ends of the heat exchange tubes of the first tube row, and the heat exchange tubes of the second tube row are provided. A third header part and a fourth header part to which the total heat exchange tubes of the second tube row are connected are provided on both upper and lower ends.
The first tube row is composed of a plurality of heat exchange tubes arranged continuously, and has a downflow tube group in which the refrigerant flows from top to bottom in the heat exchange tube, and the second tube row is arranged continuously. The upflow tube group is composed of a plurality of heat exchange tubes and the refrigerant flows from the bottom to the top in the heat exchange tubes, and the downflow tube group of the first tube row is the leeward side of the upflow tube group of the second tube row Located in the
The upper end portion of the heat exchange tube of the downflow tube group of the first tube row is connected to the first header portion, and an entry side section into which the refrigerant flows into the heat exchange tube of the downflow tube group is provided. The lower end part of the heat exchange tube of the upflow tube group of the second tube row is connected to the 4 header part, and an entrance side section into which the refrigerant flows into the heat exchange tube of the upflow tube group is provided. The ends of the portions inserted in the inlet side sections of the heat exchange tubes of the downflow tube group of the tube row and the heat exchange tubes of the upflow tube group of the second tube row are inclined downward toward the windward side. The evaporator according to claim 1. In the first tube row, the downflow tube groups and the upflow tube groups that are composed of a plurality of heat exchange tubes arranged in succession and in which the refrigerant flows from the bottom to the top in the heat exchange tubes are alternately arranged. In the second tube row, the upflow tube groups and the downflow tube groups comprising a plurality of continuously arranged heat exchange tubes and the refrigerant flowing from top to bottom in the heat exchange tubes are alternately arranged. And the downflow tube group of the first tube row is located on the leeward side of the upflow tube group of the second tube row, and the upflow tube group of the first tube row is leeward of the downflow tube group of the second tube row. Located on the side,
The second header portion is connected to the lower end portion of the upflow tube group of the first tube row, and is provided with an entry side section through which the refrigerant flows into the heat exchange tube of the upflow tube group. The upper end portion of the heat exchange tube of the downflow tube group of the second tube row is connected, and an entrance side section into which the refrigerant flows into the heat exchange tube of the downflow tube group is provided, and the first tube row rises. The end part of the part inserted in the entrance side section in the heat exchange tube of the flow tube group and the heat exchange tube of the downflow tube group of the second tube row is inclined downward toward the windward side. The described evaporator. One tube row consisting of a plurality of flat heat exchange tubes arranged with the longitudinal direction facing the vertical direction is provided, and the total heat exchange tubes of the tube row are connected to the upper and lower ends of the heat exchange tubes of the tube row. A first header portion and a second header portion are provided,
The tube row is composed of a plurality of heat exchange tubes arranged continuously and the downflow tube group in which the refrigerant flows from the top to the bottom in the heat exchange tube, and the plurality of heat exchange tubes arranged in series and the refrigerant is And an upflow tube group that flows from the bottom to the top in the heat exchange tube,
The first header portion is connected to the upper end portion of the heat exchange tube of the downflow tube group, and is provided with an entry side section into which the refrigerant flows into the heat exchange tube of the downflow tube group, and the second header portion, The lower end portion of the heat exchange tube of the upflow tube group is connected, and an inlet side section into which the refrigerant flows into the heat exchange tube of the upflow tube group is provided, and the heat exchange tube and the upflow tube of the downflow tube group The evaporator according to claim 1, wherein an end of a portion inserted into the entrance side section of the heat exchange tube of the group is inclined downward toward the windward side.

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