JP2013024517A - Laminated heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-manufacture laminated heat exchanger that discharges air at a uniform temperature.SOLUTION: Partitions 22, 23, 24, 25 are respectively disposed between two header sections 7, 8, 14, 15 of a first heat exchange section 3 and a forth heat exchange section 6, and two header sections 9, 11, 12, 13 of a second heat exchange section 4 and a third heat exchange section 5, of the laminated heat exchanger 1. The partitions 22, 23, 24, 25 are disposed on a sheet of separate plate 41 disposed between both metallic plates of a flat hollow body. A first intermediate header section 8 of the first heat exchange section 3 and a second intermediate header section 11 of the second heat exchange section 4 communicate with each other through a through hole 26 formed on the partition 23. A sixth intermediate header section 15 of the forth heat exchange section 6 and a fifth intermediate header section 13 of the third heat exchange section 5 communicate with each other through a through hole 27 formed on the partition 25. A communicating section 42 for connecting the through holes 26, 27 is formed on the separate plate 41.

Description

  The present invention relates to a stacked heat exchanger, and more particularly to a stacked heat exchanger used as an evaporator of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  In this specification and claims, the top, bottom, left and right in FIGS. 1 and 4 are referred to as top and bottom, and left and right, and the downstream side of the air flowing in the ventilation gap (the direction indicated by the arrow X in FIGS. The other side is the back.

  2. Description of the Related Art Conventionally, as an evaporator for a car air conditioner, two refrigerants which are composed of two vertically long metal plates whose peripheral portions are joined to each other and extend in the up-down direction are provided between the two metal plates at intervals in the ventilation direction. A plurality of flat hollow bodies, each having a pipe section and a header forming section provided continuously to both upper and lower ends of each refrigerant circulation pipe section, are arranged in a laminated manner and the header forming sections of adjacent flat hollow bodies are joined together A plurality of heat exchanging portions formed of two header portions provided at intervals in the vertical direction and a plurality of refrigerant flow pipe portions provided between the upper and lower header portions are arranged on the leeward side. And the same number are arranged on the windward side, all the heat exchanging parts are connected in series so that the refrigerant sequentially flows in all the heat exchanging parts, and the first heat exchanging part on the most upstream side in the refrigerant flow direction on the leeward side And the most upstream A second heat exchanging part is provided on the windward side, a fourth heat exchanging part on the furthest downstream side in the refrigerant flow direction and a third heat exchanging part second on the most downstream side are provided, and the first heat exchanging part And the fourth heat exchange part on the most downstream side is provided side by side in the ventilation direction so that the former is on the leeward side, and the upper header part of the first heat exchange part is the refrigerant inlet header part, and the fourth heat The upper header part arranged on the windward side of the refrigerant inlet header part in the exchange part is a refrigerant outlet header part, the upper and lower header parts of the other heat exchange parts are intermediate header parts, and the two headers of the first heat exchange part A partition is provided between each of the two header portions of the first and fourth heat exchanging portions and the two header portions of the second heat exchanging portion and the two header portions of the third heat exchanging portion. The through-hole formed in the partition with the lower header part of the second heat exchange part and the lower header part of the second heat exchange part The lower header part of the third heat exchange part and the lower header part of the fourth heat exchange part are communicated by a through hole formed in the partition, and the upper header part of the second heat exchange part A lamination-side heat exchanger is widely known in which the upper header portion of the third heat exchange portion is communicated via a communication portion provided between both header portions.

  In the well-known stacked heat exchanger described above, when the refrigerant flows from the lower header portion of the third heat exchange portion into the lower header portion of the fourth heat exchange portion, the inertial force causes the fourth heat exchange portion. Since it is easy to flow to the back side of the lower header part, a large amount of refrigerant flows into the refrigerant circulation pipe part located far from the third heat exchange part among all the refrigerant circulation pipe parts of the fourth heat exchange part, A small amount of refrigerant will flow into the refrigerant flow pipe part on the third heat exchange part side, and the flow of refrigerant to all the refrigerant flow pipe parts of the fourth heat exchange part will be uneven. As a result, the exhalation temperature, which is the temperature of the air that has passed through the evaporator, may become uneven in the left-right direction. Moreover, the refrigerant | coolant which flows through the refrigerant | coolant distribution pipe part of a 4th heat exchange part is a refrigerant | coolant with a high dryness, and the heat exchange efficiency in a 4th heat exchange part is comparatively low.

  In order to solve such a problem, in the well-known stacked heat exchanger described above, the lower header portion of the second heat exchange portion, the lower header portion of the third heat exchange portion, and the lower portion of the second heat exchange portion. Laminated type in which side header part and lower header part of fourth heat exchange part or lower header part of first heat exchange part and lower header part of third heat exchange part are communicated through communication path A heat exchanger has been proposed (see Patent Document 1).

  In the stacked heat exchanger described in Patent Document 1, the first heat exchange part or the second heat exchange part is provided in the lower header part of the fourth heat exchange part via the lower header part of the third heat exchange part or directly. Since it becomes possible to flow in the refrigerant having a relatively low dryness in the heat exchange part, the heat exchange efficiency in the fourth heat exchange part is improved. Further, the flow of the refrigerant flowing into the lower header part of the third heat exchange unit and the flow of the refrigerant flowing into the lower header part of the fourth heat exchange unit are changed from the lower header part of the third heat exchange unit. Since the inertial force of the refrigerant flowing into the lower header part of the fourth heat exchange part is weakened, it becomes difficult to flow to the back side of the lower header part of the fourth heat exchange part, and all the refrigerant flow pipes of the fourth heat exchange part The amount of refrigerant flowing into the refrigerant flow pipe part located far from the third heat exchange part among the parts is reduced, and the amount of refrigerant flowing into the refrigerant flow pipe part on the third heat exchange part side is also increased. Therefore, the flow of the refrigerant to all the refrigerant flow pipes of the fourth heat exchange unit is made uniform, and the exhaust temperature that is the temperature of the air that has passed through the evaporator becomes uniform in the left-right direction.

  However, in the stacked heat exchanger described in Patent Document 1, the communication path that passes through the lower header portion of the second heat exchange portion and the lower header portion of the third heat exchange portion, the lower side of the second heat exchange portion The communication path that passes through the header part and the lower header part of the fourth heat exchange part, or the communication path that passes through the lower header part of the first heat exchange part and the lower header part of the third heat exchange part, is flat. Since it is provided by deforming between the header forming portions of the vertically long metal plate forming the hollow body, the work of creating the vertically long metal plate having the communication path becomes troublesome, and the vertically long metal plate having the communication path There is a problem that the arrangement work at the determined position is troublesome, and the manufacturing work of the laminated heat exchanger is troublesome.

JP 2005-300021 A

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a laminated heat exchanger that can make the discharge temperature uniform and can be manufactured easily when applied to an evaporator for a car air conditioner, for example.

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

1) Two refrigerant distribution pipe sections and respective refrigerant distributions which are composed of two vertically long metal plates whose peripheral portions are joined to each other and which are provided between the two metal plates and are spaced apart in the ventilation direction. A plurality of flat hollow bodies provided with header forming portions provided continuously at both upper and lower ends of the pipe portion are formed by stacking and joining the header forming portions of adjacent flat hollow bodies. A plurality of heat exchanging parts each including two header parts provided at intervals in the vertical direction and a plurality of refrigerant flow pipe parts provided between the upper and lower header parts. All the heat exchange units are connected in series so that the refrigerant sequentially flows through all the heat exchange units, and the first heat exchange unit on the most upstream side in the refrigerant flow direction and the final heat exchange on the most downstream side So that the former is on the leeward side Provided side by side in the ventilation direction, one header part of the first heat exchange part becomes the refrigerant inlet header part, and the other header part becomes the first intermediate header part, and the refrigerant inlet header part in the final heat exchange part While the header portion arranged on the windward side becomes the refrigerant outlet header portion, the header portion arranged on the windward side of the first intermediate header portion is a stacked heat exchanger that is the final intermediate header portion,
Two header sections of the first heat exchange section and two header sections of the final heat exchange section, two header sections of the second heat exchange section adjacent to the first heat exchange section on the downstream side in the refrigerant flow direction, and final heat exchange Partitions are provided between the two header parts of the second heat exchange part from the last adjacent to the upstream side of the refrigerant flow direction, and these partitions are arranged between the two metal plates of the flat hollow body. The first intermediate header portion of the first heat exchange portion and the intermediate header portion of the second heat exchange portion arranged at one end portion in the longitudinal direction of the first intermediate header portion are communicated by a through hole formed in the partition, The final intermediate header part of the final heat exchange part and the intermediate header part of the second heat exchange part from the last arranged at one end in the longitudinal direction of the final intermediate header part are communicated by a through hole formed in the partition, and the through hole The two partitions having Holes, laminated heat exchanger that is vented by the communication portion formed in the monolith of the two divider.

  2) The four partitions are provided on one separate plate disposed between the two metal plates of the flat hollow body, and the first intermediate header portion and the second heat of the first heat exchange portion are provided on the separate plate. A through hole in the partition between the intermediate header part of the exchange part, the final intermediate header part of the final heat exchange part, and the intermediate header part of the second heat exchange part from the last lined up at one end in the longitudinal direction of the final intermediate header part; The laminated heat exchanger as described in 1) above, wherein a through hole of a partition between the two and a communicating portion through which both through holes are formed.

  3) The laminated heat exchanger according to 2) above, wherein the thickness of the separate plate is 0.5 to 1.6 mm.

  According to the laminated heat exchangers 1) to 3) above, the two header parts of the first heat exchange part, the two header parts of the final heat exchange part, and the downstream side of the first heat exchange part in the refrigerant flow direction. A partition is provided between each of the two header portions of the adjacent second heat exchange portion and the two header portions of the second heat exchange portion from the last adjacent to the upstream side in the refrigerant flow direction of the final heat exchange portion. Is arranged between the two metal plates of the flat hollow body, and is intermediate between the first intermediate header part of the first heat exchange part and one end part in the longitudinal direction of the first intermediate header part. The intermediate header part of the second heat exchange part from the last arranged in the longitudinal direction of the final intermediate header part and the final intermediate header part of the final heat exchange part, which is communicated by the through hole formed in the partition with the header part Are connected through a through hole formed in the partition, and have the through hole. Since the two partitions are integrated and the two through holes are communicated by a communication portion formed in the integrated body of the two partitions, the first heat exchange is provided in the final intermediate header portion of the final heat exchange portion. Formed in a partition between the first intermediate header part of the first heat exchange part and the intermediate header part of the second heat exchange part arranged at one end in the longitudinal direction of the first intermediate header part. A through hole, a communicating portion and a final intermediate header portion of the final heat exchange portion and a second intermediate heat header portion of the last heat exchange portion arranged at one end in the longitudinal direction of the final intermediate header portion are formed in a partition It becomes possible to allow a refrigerant having a relatively low dryness to flow through the hole, and the heat exchange efficiency in the final heat exchange section is improved. Moreover, the intermediate header part of the 2nd heat exchange part located in a line from the 1st intermediate header part of the 1st heat exchange part to the 1st intermediate header part of the 1st heat exchange part, and the longitudinal direction one end part of the 1st intermediate header part, Through-holes formed in the partition between the intermediate header of the second heat exchange part from the last through the communicating part and the last intermediate header part of the final heat exchange part and one end in the longitudinal direction of the final intermediate header part The inertial force of the refrigerant flowing into the final intermediate header part of the final heat exchange part from the second intermediate header part from the last is weakened by the flow of the refrigerant flowing into the through hole formed in the partition. It becomes difficult to flow to the back side of the final intermediate header part of the exchange part, the flow of refrigerant to all the refrigerant circulation pipe parts of the final heat exchange part is made uniform, and the exhalation temperature, which is the temperature of the air that has passed through the evaporator, Uniform in the horizontal direction. In addition, the integrated unit of the partitions having the two through holes and the communicating portion through both the through holes can be easily disposed at a predetermined position. Moreover, it is not necessary to perform special processing on the metal plate constituting the flat hollow body. Therefore, the manufacturing operation of the stacked heat exchanger is simplified.

  According to the laminated heat exchanger of 2), the integrated body of the partition having the two through holes and the communicating portion through both the through holes, and the other two partitions having no through holes are easily specified. It can be arranged at a predetermined position. In addition, by changing the thickness of the separate plate, it is possible to easily change the passage cross-sectional area of the communication portion, and from the first intermediate header portion of the first heat exchange portion to the final intermediate header portion of the final heat exchange portion. It is possible to optimize the amount of refrigerant flowing into the tank.

  According to the laminated heat exchanger of 3) above, it flows from the first intermediate header part of the first heat exchange part into the intermediate header part of the second heat exchange part arranged at one end in the longitudinal direction of the first intermediate header part. A sufficiently low amount of refrigerant necessary to effectively improve the heat exchange efficiency in the final heat exchanging portion, while allowing a sufficient amount of refrigerant to flow into the final intermediate header portion. In addition, it is possible to effectively weaken the inertial force of the refrigerant flowing into the final intermediate header part of the final heat exchange part from the second intermediate header part from the last.

It is a perspective view which shows the whole structure of the evaporator to which the laminated heat exchanger of this invention is applied. 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 CC sectional view taken on the line of FIG. FIG. 2 is a cross-sectional view of a portion of a refrigerant flow pipe portion of most flat hollow bodies used in the evaporator of FIG. 1. It is a disassembled perspective view of the 1st flat hollow body used for the evaporator of FIG. It is a disassembled perspective view of the 2nd flat hollow body used for the evaporator of FIG. It is a disassembled perspective view which shows the 3rd flat hollow body and pipe joint plate which are used for the evaporator of FIG. It is a disassembled perspective view which shows the 4th flat hollow body used for the evaporator of FIG. It is a figure which shows the flow of the refrigerant | coolant in the evaporator of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the laminated heat exchanger according to the present invention is applied to an evaporator for a car air conditioner.

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

  1 to 4 show the overall configuration of the evaporator according to the first embodiment, FIGS. 4 to 9 show the configuration of the main part, and FIG. 10 shows the flow of refrigerant in the evaporator.

  1 to 4, the evaporator (1) has a plurality of flat hollow bodies (2A), (2B), (2C), and (2D) each having a substantially vertical rectangular shape in the left-right direction with the width direction set to the front-rear direction (ventilation direction). The two header portions (7), (8), (9), which are formed by being laminated to each other and joined to each other, are provided at intervals in the vertical direction and extend in the horizontal direction. (11) (12) (13) (14) (15) and upper and lower header parts (7) (8) (9) (11) (12) (13) (14) (15) A plurality of refrigerant flow pipe sections (16), (17) provided at a distance, and a plurality of, in this case, four heat exchange sections (3), (4), (5), (6) connected in series. I have. The refrigerant flows through all the heat exchanging sections (3), (4), (5), and (6) sequentially. Here, the four heat exchange sections (3), (4), (5), and (6) are referred to as first to fourth heat exchange sections from the upstream side to the downstream side in the refrigerant flow direction.

  The first heat exchange part (3) and the second heat exchange part (4) are provided side by side on the leeward side, and the third heat exchange part (5) and the fourth heat exchange part (6) Line up in the left-right direction so that the third heat exchange part (5) is on the windward side of the second heat exchange part (4) and the fourth heat exchange part (6) is on the windward side of the first heat exchange part (3). Is provided. The upper header part of the first heat exchange part (3) on the most upstream side in the refrigerant flow direction is the refrigerant inlet header part (7), and the lower header part is the first intermediate header part (8). The lower header part of the second heat exchange part (4) is the second intermediate header part (11), and the upper header part is the third intermediate header part (9). The upper header part of the third heat exchange part (5) is the fourth intermediate header part (12), and the lower header part is the fifth intermediate header part (13). Further, the lower header part of the fourth heat exchange part (6) on the most downstream side in the refrigerant flow direction is the sixth intermediate header part (15), and the upper header part is the refrigerant outlet header part (14) (see FIG. 10).

  A refrigerant inlet (18) is formed at the right end of the refrigerant inlet header (7), and a refrigerant outlet (19) is formed at the right end of the refrigerant outlet header (14). The refrigerant inlet (21a) leading to the refrigerant inlet (18) and the refrigerant outlet (19) leading to the refrigerant outlet (19) so as to straddle the right end of the refrigerant inlet header (7) and the refrigerant outlet header (14) ( An aluminum joint plate (21) having 21b) is joined, a refrigerant inlet pipe (not shown) is connected to the refrigerant inlet (21a) of the joint plate (21), and a refrigerant outlet pipe (not shown) is connected to the refrigerant outlet (21b). ) Is connected.

  Between the upper and lower header sections (7) and (8) of the first heat exchange section (3) and the upper and lower header sections (9) and (11) of the second heat exchange section (4), and the third heat exchange Partition (22) (23) between the upper and lower header sections (12) (13) of the section (5) and the upper and lower header sections (14) (15) of the fourth heat exchange section (6), respectively. ) (24) (25). A partition (23) between the first intermediate header part (8) of the first heat exchange part (3) and the second intermediate header part (11) of the second heat exchange part (4), and a third heat exchange part In the partition (25) between the fifth intermediate header portion (13) of (5) and the sixth intermediate header portion (15) of the fourth heat exchange portion (6), the header portions (8) and (11) are respectively provided. And (13) and (15) are formed with through-holes (26) and (27) through which they pass (see FIG. 10). Further, the third intermediate header portion (9) of the second heat exchange portion (4) and the fourth intermediate header portion (12) of the third heat exchange portion (5) are communicated by a plurality of communication passages (28). It has been.

  As shown in FIGS. 2 to 5, the flat hollow bodies (2A), (2B), (2C), and (2D) are composed of two vertical rectangular aluminum plates (29A) (29B) in which peripheral portions are brazed to each other. (29C) (29D). All the aluminum plates (29A) (29B) (29C) (29D) are made of an aluminum brazing sheet having a brazing filler metal layer on both sides. Between the two aluminum plates (29A) (29B) (29C) (29D) constituting the flat hollow body (2A) (2B) (2C) (2D) The circulation pipe parts (16), (17) and the bulged header forming parts (31), (32) respectively connected to the upper and lower ends of each refrigerant circulation pipe part (16), (17) are provided. Aluminum corrugated so as to straddle the refrigerant flow pipe sections (16) (17) before and after most flat hollow bodies (2A) (2B) (2C) excluding the flat hollow body (2D) at the center in the left-right direction An inner fin (33) is disposed and brazed to both aluminum plates (29A) (29B) (29C). An aluminum corrugated inner fin may be separately arranged in each refrigerant flow pipe section (16) (17).

  The horizontal height of the header forming portions (31) and (32) in the flat hollow bodies (2A), (2B), (2C), and (2D) is higher than the horizontal height of the refrigerant flow pipe portions (16) and (17). The header forming portions (31) and (32) of adjacent flat hollow bodies (2A), (2B), (2C), and (2D) are brazed to each other. Then, the refrigerant inlet header portion (7) and the first to third intermediate header portions (8) (11) are formed by the upper and lower header forming portions (31) on the front side of the flat hollow body (2A) (2B) (2C) (2D). ) (9) is formed, and the refrigerant outlet header portion (14) and the fourth to sixth intermediate header portions (12), (13), and (15) are also formed by the upper and lower header forming portions (32) on the rear side. Yes. Also, between the adjacent flat hollow bodies (2A), (2B), (2C), and (2D), the refrigerant flow pipe portions (16) and (17) form a ventilation gap, and an aluminum corrugated outer fin (34) is provided in the ventilation gap. Are arranged and brazed to the flat hollow bodies (2A) (2B) (2C) (2D).

  Except for the flat hollow body (2C) disposed at the left and right ends and the flat hollow body (2D) disposed at the center in the left-right direction, the refrigerant inlet header (7), the refrigerant outlet header (14), the first intermediate The configuration of the first flat hollow body (2A) forming the header portion (8) and the sixth intermediate header portion (15) is shown in FIG. As shown in FIG. 6, the right aluminum plate (29A) constituting the first flat hollow body (2A) extends in the up-down direction and bulges to the right and left two tube-forming bulging portions (35). ) And four header formations that are connected to the upper and lower ends of each tube forming bulge portion (35) and bulge to the right and have a bulge height higher than the tube portion bulge portion (35). And a bulging portion (36) for use. The entire top wall of each header forming bulge portion (36) is punched to form a through hole (37). The left aluminum plate (29A) constituting the first flat hollow body (2A) is the right aluminum plate (29A) reversed in the left-right direction, and the same parts are denoted by the same reference numerals. The first flat hollow body is brazed by combining two aluminum plates (29A) through the inner fins (33) so that the openings of the bulging portions (35) and (36) face each other. (2A) is formed. Further, the header forming portions (31), (32) of the two adjacent first flat hollow bodies (2A) are brazed so as to communicate with each other.

  Except for the flat hollow body (2C) arranged at the left and right ends and the flat hollow body (2D) arranged at the center in the left-right direction, the second intermediate header part (11), the third intermediate header part (9), The structure of the 2nd flat hollow body (2B) which forms the 4 intermediate header part (12) and the 5th intermediate header part (13) is shown in FIG. As shown in FIG. 7, the portion between the upper two header forming bulges (36) in the right aluminum plate (29B) of the second flat hollow body (2B) has a header forming bulge (36). ) And a communication passage forming bulge portion (38) bulged outwardly so as to be slightly lower than the two), and the two header formation bulge portions (36) are connected to each other. It is made to communicate by the exit part (38). The left aluminum plate (29B) of the second flat hollow body (2B) is obtained by inverting the right aluminum plate (29B) in the left-right direction. A bulging communication path (28) is formed by the communication path forming bulging portion (38) of both aluminum plates (29B). The other structure of the second flat hollow body (2B) is the same as that of the first flat hollow body (2A) shown in FIG. 6, and the header forming portions (31) of two adjacent second flat hollow bodies (2B) (32) The two are brazed in the same manner as in the case of the adjacent first flat hollow bodies (2A).

  The configuration of the third flat hollow body (2C) arranged at the right end is shown in FIG. As shown in FIG. 8, the right aluminum plate (29C) constituting the third flat hollow body (2C) has the bulging height of all the bulges for forming the header (36A). It is equal to the bulging height of the part (35). Also, no through hole is formed in the top wall of the lower two header forming bulges (36A) in the right aluminum plate (29C). Further, a refrigerant inlet (18) is formed in the top wall of the upper front header bulging portion (36A) in the right aluminum plate (29C), and the upper rear header bulging is also formed. A refrigerant outlet (19) is formed in the top wall of the portion (36A) so as to penetrate therethrough. The other configuration of the third flat hollow body (2C) is the same as that of the first flat hollow body (2A) shown in FIG. 6, and the header forming portions (31A) (32A) of the third flat hollow body (2C) The header forming portions (31) and (32) of the first flat hollow body (2A) adjacent to the left are brazed in the same manner as in the case of the adjacent first flat hollow body (2A). . The pipe joint plate (21) has a third flat hollow body (2C) such that the refrigerant inlet (21a) communicates with the refrigerant inlet (18) and the refrigerant outlet (21b) communicates with the refrigerant outlet (19). It is brazed.

  Although detailed illustration is omitted, the flat hollow body (2C) arranged at the left end has a point that no through-hole is formed in the top wall of all the header forming bulges (36A), and a pipe joint plate ( Except for the point that 21) is not brazed, it has the same configuration as the third flat hollow body (2C), and is disposed in the opposite direction.

  FIG. 9 shows the configuration of the fourth flat hollow body (2D) arranged at the center in the left-right direction. As shown in FIG. 9, the top wall of the tube forming bulge portion (35) in both aluminum plates (29D) constituting the fourth flat hollow body (2D) is recessed inwardly. A plurality of ribs (39) extending in the vertical direction and projecting inward are formed at intervals in the front-rear direction. The protruding height of the rib (39) is equal to the protruding height of the tube portion forming bulge portion (35). In addition, a vertical rectangular plate-shaped aluminum separate plate (41) is interposed between both aluminum plates (29D), and the peripheral portion of the separate plate (41) is located at the peripheral portion of both aluminum plates (29D). It is brazed to both aluminum plates (29D) in a sandwiched state. Further, the tip of the rib (39) of both aluminum plates (29D) is brazed to the separate plate (41). In addition, the inner fin is not arrange | positioned in a 4th flat hollow body (2D).

  The separation plate (41) has a partition (22) between the refrigerant inlet header portion (7) of the first heat exchange portion (3) and the third intermediate header portion (9) of the second heat exchange portion (4), A partition (23) between the first intermediate header portion (8) of the first heat exchange portion (3) and the second intermediate header portion (11) of the second heat exchange portion (4), a third heat exchange portion ( The partition (24) between the fourth intermediate header portion (12) of 5) and the refrigerant outlet header portion (14) of the fourth heat exchange portion (6), and the fifth middle of the third heat exchange portion (5) A partition (25) is provided between the header part (13) and the sixth intermediate header part (15) of the fourth heat exchange part (6). That is, all the partitions (22) (23) (24) (25) are integrated. A partition (23) between the first intermediate header portion (8) and the second intermediate header portion (11) in the separate plate (41), and a fifth intermediate header portion (13) and a sixth intermediate header portion (15). Through holes (26), (27) are respectively formed in the partition (25) between the first intermediate header (8), the second intermediate header (11), and the fifth intermediate header (13). ) And the sixth intermediate header portion (15) are communicated with each other through the through holes (26) and (27). In addition, a communication portion (42) through which the two through holes (26) and (27) are passed is formed in a penetrating manner in a portion near the lower end of the separate plate (41). That is, the two partitions (23) and (25) having the through holes (26) and (27) are integrated, and the two through holes (26) and (27) are integrated into the two partitions (23) and (25). It is made to communicate by the communication part (42) formed in the integrated object. The thickness of the separate plate (41) is preferably 0.5 to 1.6 mm. If the thickness of the separate plate (41) is 0.5 mm or more, as will be described later, a comparison of the amount of dryness necessary to effectively improve the heat exchange efficiency in the fourth heat exchange section (6) Low refrigerant can be caused to flow into the sixth intermediate header portion (15), and the inertial force of the refrigerant flowing from the fifth intermediate header portion (14) into the sixth intermediate header portion (15) can be effectively reduced. It becomes possible. Moreover, if the thickness of the separate plate (41) is 1.6 mm or less, it is possible to prevent the amount of refrigerant flowing from the first intermediate header portion (8) into the sixth intermediate header portion (15) from being excessive. As a result, a sufficient amount of refrigerant flowing from the first intermediate header portion (8) into the second intermediate header portion (11) can be secured.

  The other configurations of the fourth flat hollow body (2D) are the same as those of the first flat hollow body (2A) shown in FIG. 6, and the header forming portions (31), (32) of the fourth flat hollow body (2D) The header forming portions (31) and (32) of the first flat hollow body (2A) adjacent to the right side and the header forming portions (31) and (32) of the second flat hollow body (2B) adjacent to the left side are adjacent to each other. The first flat hollow body (2A) is brazed in the same manner as in the case of the first flat hollow body (2A).

  The refrigerant inlet header portion (7) and the first intermediate header portion (8), and the second intermediate header portion (11) and the third intermediate header portion (9) are respectively flat hollow bodies (2A) (2B) (2C). (2D) front refrigerant flow pipe part (16) is connected, refrigerant outlet header part (14) and sixth intermediate header part (15), fourth intermediate header part (12) and fifth intermediate header part (13) are communicated with each other by a refrigerant flow pipe section (17) on the rear side of the flat hollow bodies (2A), (2B), (2C), and (2D). Moreover, the 3rd intermediate header part (9) and the 4th intermediate header part (12) are connected via the communicating path (28) formed in the 2nd flat hollow body (2B).

  The evaporator (1) is manufactured by temporarily fastening a combination of the constituent members and brazing all the constituent members together.

  The evaporator (1) is housed in a case disposed in a vehicle interior of a vehicle, for example, an automobile, constitutes a refrigeration cycle together with a compressor and a condenser, and is used as a car air conditioner.

  In the above-described evaporator (1), as shown in FIG. 10, the gas-liquid mixed phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve (decompression means) is supplied from the inlet pipe to the pipe joint plate (21). The refrigerant enters the refrigerant inlet header (7) through the inlet (21a) and the refrigerant inlet (18). The refrigerant that has flowed into the refrigerant inlet header (7) is divided in the refrigerant inlet header (7) while flowing to the left, and communicates with the refrigerant inlet header (7) in the front refrigerant flow pipe (16). Flows into the refrigerant flow pipe part (16), enters the first intermediate header part (8) and merges, flows to the left in the first intermediate header part (8), and passes through ( 26) through the second intermediate header (11). At the same time, the refrigerant in the first intermediate header portion (8) flows backward through the through hole (26) and the communication portion (42) and reaches the through hole (27).

  The refrigerant that has flowed into the second intermediate header portion (11) is diverted while flowing to the left in the second intermediate header portion (11), and leads to the second intermediate header portion (11). 16) flows into the refrigerant flow pipe part (16) and enters the third intermediate header part (9). The refrigerant that has flowed into the third intermediate header portion (9) passes through the communication path (28) of the second flat hollow body (2B) and enters the fourth intermediate header portion (12). The refrigerant flows into the rear refrigerant flow pipe portion (17) leading to 12), flows downward in the refrigerant flow pipe portion (17), enters the fifth intermediate header portion (13), and merges. The refrigerant that has entered the fifth intermediate header portion (13) flows to the right in the fifth intermediate header portion (13), passes through the through hole (27), and enters the sixth intermediate header portion (15). At this time, the low dryness refrigerant flowing from the first intermediate header portion (8) through the through hole (26) and the communication portion (42) to the through hole (27) side is also in the sixth intermediate header portion (15). to go into.

  The refrigerant that has entered the sixth intermediate header portion (15) is branched while flowing to the right in the sixth intermediate header portion (15), and is then led to the sixth intermediate header portion (15). (17) flows into the refrigerant flow pipe part (17) and enters the refrigerant outlet header part (14). The refrigerant flowing into the refrigerant outlet header (14) enters the outlet pipe through the refrigerant outlet (19) and the refrigerant outlet (21b) of the pipe joint plate (21), and is sent out from the outlet pipe. Air flowing in the direction indicated by the arrow X in FIGS. 1 and 10 while flowing through the refrigerant flow pipe portions (16), (17) of the flat hollow bodies (2A), (2B), (2C), (2D). Heat exchange with the gas and flow out as a gas phase.

  Here, since the refrigerant having a relatively low dryness in the first intermediate header portion (8) also flows into the sixth intermediate header portion (15), the heat in the fourth heat exchange portion (6). Exchange efficiency is improved. Further, the refrigerant flows from the first intermediate header portion (8) through the through hole (26) and the communication portion (42) toward the through hole (27) and flows into the sixth intermediate header portion (15). Since the inertial force of the refrigerant flowing into the sixth intermediate header portion (15) from the fifth intermediate header portion (14) is weakened, the refrigerant is the sixth intermediate header portion (15 of the fourth heat exchange portion (6)). ) And the refrigerant flow pipe part (6) of the fourth heat exchange part located far from the third heat exchange part (5) among all the refrigerant flow pipe parts (17) 17) The amount of refrigerant flowing into the refrigerant is reduced, and the amount of refrigerant flowing into the refrigerant flow pipe section (17) on the third heat exchange section (5) side is increased. Therefore, the flow of the refrigerant to all the refrigerant flow pipe parts (17) of the fourth heat exchange part (6) is made uniform, and the exhalation temperature, which is the temperature of the air passing through the evaporator 81), is made uniform in the left-right direction. Become.

  The laminated heat exchanger according to the present invention is suitably used as an evaporator of a refrigeration cycle constituting a car air conditioner.

(1): Evaporator
(2A) (2B) (2C) (2D): Flat hollow body
(3) (4) (5) (6): Heat exchanger
(7): Refrigerant inlet header
(8) (9) (11) (12) (13) (15): Intermediate header
(14): Refrigerant outlet header
(16) (17): Refrigerant distribution pipe
(22) (23) (24) (25): Partition
(26) (27): Through hole
(31) (32): Header forming part
(41): Separate plate
(42): Communication part

Claims (3)

Two refrigerant distribution pipe sections and two refrigerant distribution pipe sections, which are composed of two vertically long metal plates whose peripheral portions are joined to each other and extend between the two metal plates and spaced in the ventilation direction. A plurality of flat hollow bodies provided with header forming portions provided continuously at both upper and lower ends are formed by stacking and joining header forming portions of adjacent flat hollow bodies. A plurality of heat exchanging sections each composed of two header sections provided at intervals in the vertical direction and a plurality of refrigerant flow pipe sections provided between the upper and lower header sections are arranged in the same number on the leeward side and the windward side. All the heat exchanging parts are connected in series so that the refrigerant flows through all the heat exchanging parts sequentially, and the first heat exchanging part on the most upstream side in the refrigerant flow direction and the final heat exchanging part on the most downstream side are provided. , So that the former comes to the leeward side Provided side by side in the wind direction, one header part of the first heat exchange part becomes the refrigerant inlet header part, and the other header part becomes the first intermediate header part, and the refrigerant inlet header part in the final heat exchange part While the header portion arranged on the windward side becomes the refrigerant outlet header portion, the header portion arranged on the windward side of the first intermediate header portion is a stacked heat exchanger that is the final intermediate header portion,
Two header sections of the first heat exchange section and two header sections of the final heat exchange section, two header sections of the second heat exchange section adjacent to the first heat exchange section on the downstream side in the refrigerant flow direction, and final heat exchange Partitions are provided between the two header parts of the second heat exchange part from the last adjacent to the upstream side of the refrigerant flow direction, and these partitions are arranged between the two metal plates of the flat hollow body. The first intermediate header portion of the first heat exchange portion and the intermediate header portion of the second heat exchange portion arranged at one end portion in the longitudinal direction of the first intermediate header portion are communicated by a through hole formed in the partition, The final intermediate header part of the final heat exchange part and the intermediate header part of the second heat exchange part from the last arranged at one end in the longitudinal direction of the final intermediate header part are communicated by a through hole formed in the partition, and the through hole The two partitions having Holes, laminated heat exchanger that is vented by the communication portion formed in the monolith of the two divider. The four partitions are provided on one separate plate disposed between the two metal plates of the flat hollow body, and the first intermediate header portion and the second heat exchange portion of the first heat exchange portion are provided on the separate plate. Between the intermediate header portion of the partition, between the final intermediate header portion of the final heat exchange portion and the intermediate header portion of the second heat exchange portion from the last lined at one end in the longitudinal direction of the final intermediate header portion The laminated heat exchanger according to claim 1, wherein a through hole of the partition and a communication portion through which both the through holes are formed are formed. The laminated heat exchanger according to claim 2, wherein the thickness of the separate plate is 0.5 to 1.6 mm.

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