JP2013002652A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing an increase in passage resistance and the occurrence of refrigerant flow noise when a refrigerant flows in through a refrigerant inlet.SOLUTION: An evaporator 1 includes: a heat exchange core 4 having a plurality of heat exchange tubes 19; and headers 5, 14 disposed in both sides in a longitudinal direction of the heat exchange tubes 19 in the heat exchange core 4, the headers having refrigerant inlets 8, 17 at one end, respectively. The headers 5, 14 comprise: header bodies 24, 25 having both ends opened; caps 26, 27, 28, 29 closing both of the open ends of the header bodies 24, 25; and partitioning members 35, 36 that partition the inside of the header bodies 24, 25 into first spaces 31, 32 communicating with the heat exchange tubes 19 and second spaces 33, 34. The refrigerant inlets 8, 17 are formed on the caps 26, 28 at one end to communicate with the second spaces 33, 34. Openings of the refrigerant inlets 8, 17 are formed to have larger areas than passage cross-sectional areas in the middle in the longitudinal direction of the second spaces 33, 34.

Description

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

  As a heat exchanger used in an evaporator that satisfies the demand for higher performance and smaller size and lighter weight, the present applicant previously has a heat exchange core portion having a plurality of heat exchange tubes arranged with the longitudinal direction oriented in the same direction. And header tanks arranged on both sides in the longitudinal direction of the heat exchange pipe in the heat exchange core portion, both header tanks having a leeward header portion and an leeward header portion, respectively, one of the first headers A refrigerant inlet is formed at one end of the leeward header portion of the tank, and a refrigerant outlet is formed at the same end as the refrigerant inlet in the leeward header tank of the first header tank. A joint plate having an inflow portion communicating with the refrigerant inflow port and an outflow portion communicating with the refrigerant outflow port is joined to an end portion on the side where the inflow port and the refrigerant outflow port are formed, and heat exchange is performed. A section is provided between the header sections of both header tanks, and has a heat exchange pipe group composed of a plurality of heat exchange pipes arranged at intervals in the length direction of both header tanks. In addition, both end portions of the heat exchange tubes of each heat exchange tube group are connected to each header portion of the first header tank and each header portion of the second header tank, and each header portion is a header portion body having both ends opened, A cap that closes both end openings of the header portion main body, and a second space that is located on the heat exchange core portion side in the header portion main body and on the opposite side of the heat exchange core portion and the first space through which the heat exchange pipe communicates A partition member that is partitioned into a space, the partition member is a flat plate, the cross-sectional areas of the first space and the second space of the header section main body are respectively constant over the entire length, and the refrigerant inlet is the first One of the leeward header section of the header tank Of the leeward header portion, and the refrigerant outlet is connected to the cap at the same end as the refrigerant inlet in the leeward header portion. A cap formed to communicate with the space and having a refrigerant inlet and a cap having a refrigerant outlet are fitted into the first protrusion and the second space, respectively, which are fitted into the first space of the header body. The refrigerant inlet and the refrigerant outlet are formed on the protruding end wall of the second protrusion of the cap, and the opening area of the refrigerant inlet is a longitudinal length in the second space through which the refrigerant inlet communicates. The heat exchanger which has become smaller than the passage cross-sectional area of the intermediate part of a direction and the passage cross-sectional area of the inflow part of a joint plate was proposed (refer patent document 1).

  However, according to the heat exchanger described in Patent Document 1, since the refrigerant inlet is formed on the protruding end wall of the second protruding portion fitted into the second space in the cap, the opening area of the refrigerant inlet However, it is smaller than the passage cross-sectional area of the intermediate portion in the longitudinal direction in the second space through which the refrigerant inlet port leads and the passage cross-sectional area of the inflow portion of the joint plate. Therefore, the flow path of the refrigerant is narrowed at the portion of the refrigerant inlet located between the second space and the inlet of the joint plate, and the refrigerant passes through the inlet of the joint plate and the refrigerant inlet of the cap. As a result, the passage resistance when entering the second space of the header body increases, and there is a risk that refrigerant flow noise will occur.

JP 2008-232456 A

  An object of the present invention is to provide a heat exchanger that solves the above-described problems and can suppress an increase in passage resistance and generation of refrigerant flow noise when the refrigerant flows in through the refrigerant inlet.

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

1) a heat exchange core portion having a plurality of heat exchange tubes arranged with the longitudinal direction oriented in the same direction, and provided at least on one side of both sides in the longitudinal direction of the heat exchange tube in the heat exchange core portion and at one end portion A header part having a refrigerant inlet, a header part having a refrigerant inlet, a header part body having both ends opened, a cap for closing both end openings of the header part body, and the inside of the header part body within the heat exchange core part side And a partition member that divides the first space through which the heat exchange pipe communicates and the second space located on the opposite side of the heat exchange core portion, and the refrigerant inflow ports open the both end openings of the header body. A heat exchanger formed on one of the two caps to be closed so as to communicate with the second space of the header portion main body,
A heat exchanger in which an opening area of the refrigerant inlet is larger than a passage cross-sectional area of an intermediate portion in a longitudinal direction in the second space through which the refrigerant inlet communicates.

  2) The passage cross-sectional area of a predetermined length portion on the refrigerant inlet side in the second space that leads to the refrigerant inlet is the largest at the refrigerant inlet side end and gradually decreases inward 1) The described heat exchanger.

  3) A plurality of refrigerant passage holes are formed in the partition member at intervals in the length direction of the header section main body, and the refrigerant passage located at the end of the refrigerant inlet side in the first space through which the heat exchange pipe communicates The heat exchanger according to 2) above, wherein a passage cross-sectional area of a portion closer to the refrigerant inlet than the hole gradually decreases toward the refrigerant inlet.

  4) The heat exchanger according to 2) or 3) above, wherein a bent portion that is bent toward the heat exchange pipe toward the refrigerant inlet is provided at a predetermined length portion on the refrigerant inlet side of the partition member.

  5) The heat exchanger according to 4) above, wherein the bent portion is curved toward the heat exchange pipe toward the refrigerant inlet, and the surface opposite to the heat exchange pipe is a convex surface.

  6) A refrigerant flow path leading to the refrigerant flow inlet is provided outside the header portion having the refrigerant flow inlet, and when viewed from within the second space of the header section main body leading to the refrigerant flow inlet, The heat exchanger according to any one of the above 1) to 5), wherein the header portion side end opening is located within the range of the refrigerant inflow port.

  According to the heat exchangers 1) to 6) described above, the opening area of the refrigerant inlet is larger than the passage cross-sectional area of the intermediate portion in the longitudinal direction in the second space that communicates with the refrigerant inlet. The flow path of the refrigerant is not restricted at the inlet portion, and the rise of passage resistance and the generation of sound when the refrigerant enters the second space of the header body through the refrigerant inlet of the cap are suppressed. Can do.

  According to the heat exchanger of 2) above, the passage cross-sectional area of the predetermined length portion on the refrigerant inlet side in the second space through which the refrigerant inlet communicates is the largest at the refrigerant inlet side end and toward the inward direction. Since it gradually decreases, the change in the cross-sectional area of the passage becomes moderate, and the increase in passage resistance and the generation of sound can be effectively suppressed.

  According to the heat exchanger of 3) above, it is possible to make uniform the flow of the refrigerant to the heat exchange pipe leading to the first space. That is, after flowing into the second space from the refrigerant inlet, the refrigerant that has entered the first space through the refrigerant passage hole located at the end on the refrigerant inlet side is heat exchange located on the refrigerant inlet side. Although it is easy to flow into the pipe, even in this case, the passage cross-sectional area of the portion closer to the refrigerant inlet than the refrigerant passage hole located at the end of the refrigerant inlet in the first space through which the heat exchange pipe passes is larger. When gradually decreasing toward the refrigerant inlet, the inflow of refrigerant into the heat exchange pipe located on the refrigerant inlet side is suppressed, and as a result, the refrigerant is diverted to the heat exchange pipe leading to the first space. It becomes possible to make uniform.

  According to the heat exchangers 4) and 5), the heat exchangers 2) and 3) can be obtained relatively easily.

  According to the heat exchanger of the above 6), since the cross-sectional area of the flow path when the refrigerant flows from the refrigerant flow path through the refrigerant inlet of the cap and into the second space of the header part body increases, An increase in passage resistance and generation of sound when entering the second space of the main body can be effectively suppressed.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. It is the vertical sectional view which abbreviate | omitted one part seen from the back of the evaporator of FIG. It is the AA line expanded sectional view of Drawing 2 which omitted some. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line of FIG. FIG. 3 is an enlarged sectional view taken along line DD in FIG. 2. It is the EE sectional view taken on the line of FIG. It is a disassembled perspective view of the 1st header tank of the evaporator of FIG. It is a disassembled perspective view of the 2nd header tank of the evaporator of FIG.

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

  In the following description, the downstream side (the direction indicated by the arrow X in FIGS. 1 and 3 to 5) of the air flowing through the ventilation gap between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear. The top and bottom and the left and right in FIG.

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

  1 to 3 show the overall configuration of the evaporator, and FIGS. 4 to 9 show the configuration of the main part of the evaporator.

  1 to 5, 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 extend in the horizontal direction, and both headers. And a heat exchange core part (4) provided between the tanks (2) and (3).

  The first header tank (2) is located on the front side (downstream side in the ventilation direction) and extends in the left and right direction at the refrigerant inlet header (5) (downstream side header part) and on the rear side (upstream side in the ventilation direction). In addition, a refrigerant outlet header portion (6) (windward header portion) extending in the left-right direction and a connecting portion (7) for connecting and integrating both header portions (5) and (6) are provided. The refrigerant inlet header (5) of the first header tank (2) has a refrigerant inlet (8) at the right end and is closed at the left end. Similarly, the refrigerant outlet header (6) is at the refrigerant outlet (6) at the right end. 9) and the left end is closed. An aluminum refrigerant inlet pipe (11) is connected to the refrigerant inlet header (5) of the first header tank (2) so as to communicate with the refrigerant inlet (8), and an aluminum refrigerant is also connected to the refrigerant outlet header (6). The outlet pipe (12) is connected to communicate with the refrigerant outlet (9), and the refrigerant inlet pipe (11) and the refrigerant outlet pipe (12) serve as refrigerant flow paths (11a) and (12a), respectively. Yes. That is, the refrigerant inlet (8) and the refrigerant outlet, respectively, outside the refrigerant inlet header (5) having the refrigerant inlet (8) and outside the refrigerant outlet header (6) having the refrigerant outlet (9). Refrigerant channels (11a) and (12a) leading to (9) are provided.

  The second header tank (3) has a first intermediate header portion (13) (leeward header portion) located on the front side and extending in the left-right direction, and a second intermediate header portion located on the rear side and extending in the left-right direction ( 14) (windward header portion) and a connecting portion (15) for connecting and integrating the header portions (13) and (14) to each other. The first intermediate header portion (13) of the second header tank (3) has a refrigerant outlet (16) at the right end and is closed at the left end. Similarly, the second intermediate header portion (14) has a refrigerant flow at the right end. It has an inlet (17) and is closed at the left end. The refrigerant outlet (16) of the first intermediate header part (13) and the refrigerant inlet (17) of the second intermediate header part (14) are arranged at the right end of the second header tank (3). 13) It is made to communicate through the communicating member (18) brazed across (14).

  The heat exchange core section (4) has a heat exchange pipe group (21) composed of a plurality of heat exchange pipes (19) arranged in parallel at intervals in the left-right direction with the longitudinal direction oriented vertically. A plurality of rows arranged in the direction, here two rows, the ventilation gap between adjacent heat exchange tubes (19) of each heat exchange tube group (21), and the left and right ends of each heat exchange tube group (21) Corrugated fins (22) are respectively arranged outside the heat exchange pipe (19) and brazed to the heat exchange pipe (19), and further, aluminum side plates (23 ) Are arranged and brazed to the corrugated fins (22). The upper and lower ends of the heat exchange pipe (19) of the front heat exchange pipe group (21) are connected to the refrigerant inlet header part (5) and the first intermediate header part (13), and the rear heat exchange pipe group (21). The upper and lower ends of the heat exchange pipe (19) are connected to the refrigerant outlet header (6) and the second intermediate header (14).

  The heat exchange pipe (19) is made of a bare material formed of an aluminum extruded profile, and has a flat shape having a plurality of refrigerant passages arranged in the width direction and arranged in the width direction in the front-rear direction. The corrugated fin (22) is shared by the front and rear heat exchange pipes (19) constituting the front and rear heat exchange pipe groups (21), and the width in the front-rear direction is equal to the front edge of the front heat exchange pipe (19). The distance from the rear edge of the rear heat exchange pipe (19) is substantially equal. Instead of sharing one corrugated fin (22) between the front and rear heat exchange tube groups (21), each corrugated fin is disposed between adjacent heat exchange tubes (19) of both heat exchange tube groups (21). May be arranged.

  The refrigerant inlet header portion (5) and the refrigerant outlet header portion (6) of the first header tank (2) are respectively provided with a header portion main body (24) (25) opened at both ends, and both header portion main bodies (24) (25 ) The caps (26), (27), (28), (29) that close the openings on both ends, and the header body (24), (25) are located on the heat exchange core (4) side (lower side) The heat exchange pipe (19) is partitioned into a first space (31) (32) and a second space (33) (34) located on the opposite side (upper side) of the heat exchange core (4). It consists of partition members (35) and (36).

  Each header body (24), (25) forms a part (lower part) on the heat exchange core part (4) side and the upper end of the heat exchange pipe (19) of the front and rear heat exchange pipe group (21) A first member (37) (38) having a substantially U-shaped cross section connected to each other and the remaining portions (upper portions) of the header body (24) (25) are formed and the first member ( 37) (38) and a second member (39) (41) having a substantially inverted U-shaped cross section, and the partition members (35) (36) are the first members (37) (38). ) And the second member (39) (41) and brazed to both members (37) (38) (39) (41). A plurality of pipe insertion holes (42) that are long in the front-rear direction in the first members (37) and (38) of the header main bodies (24) and (25) of the refrigerant inlet header (5) and the refrigerant outlet header (6), respectively. However, it is formed so as to be spaced apart in the left-right direction and to be at the same position in the left-right direction, and the upper end portion of the heat exchange pipe (19) is inserted into the pipe insertion hole (42) to form the first member (37) ( 38).

  As shown in FIGS. 2 and 6 to 9, the portion on the left side of the heat exchange pipe (19) arranged at the left end of the partition member (35) of the refrigerant inlet header (5) A rectangular communication port (45) is formed which is long in the front-rear direction and allows the two spaces (31) and (33) in the header body (24) to pass therethrough. A guide portion (46) that protrudes toward the first space (31) and guides the refrigerant to the right side is integrally formed on the left edge portion of the communication port (45) in the partition member (35). In addition, a circular refrigerant passage hole (47) is formed in the center portion in the front-rear direction of the partition member (35), the center portion in the left-right direction, and the left and right side portions.

  In the predetermined length portion on the refrigerant inlet (8) side of the partition member (35) of the refrigerant inlet header (5), toward the refrigerant inlet (8) side, toward the heat exchange pipe (19) side (lower side) A bent portion (43) that is bent is provided. The bent portion (43) is formed closer to the refrigerant inlet (8) than the refrigerant passage hole (47) located at the end (right end) on the refrigerant inlet (8) side of the partition member (35). The bent portion (43) is curved toward the heat exchange pipe (19) side (lower side) toward the refrigerant inlet (8), and the surface (upper surface) opposite to the heat exchange pipe (19) is convex. It has become. The close contact of the bent portion (43) with both the front and rear side edges and the refrigerant inlet (8) side edge along the inner surface of the first member (37) and brazed to the first member (37) The part (44) is provided integrally. The right end of the first space (31) is closed by the bent portion (43). Therefore, the refrigerant passage hole (47) located at a predetermined length portion on the refrigerant inlet (8) side in the second space (33) of the header portion main body (24) of the refrigerant inlet header portion (5), here the right end portion. The passage cross-sectional area of the refrigerant inlet (8) side portion is larger at the refrigerant inlet (8) side end and gradually decreases inward, and the heat exchange pipe (19) The passage cross-sectional area of the portion closer to the refrigerant inlet (8) than the refrigerant passage hole (47) located at the right end portion in the first space (31) to be communicated gradually becomes smaller toward the refrigerant inlet (8). Yes.

  A predetermined length portion on the refrigerant outlet (9) side of the partition member (36) of the refrigerant outlet header (6), here, on the refrigerant outlet (9) side than the heat exchange pipe (19) arranged at the right end portion In this part, an inclined part (48) inclined toward the heat exchange pipe (19) side (lower side) toward the refrigerant outlet (9) side is formed. The close contact between the front and rear side edges of the inclined portion (48) and the coolant outlet (9) side edge along the inner surface of the first member (38) and brazed to the first member (38). The part (49) is provided integrally. Accordingly, the heat exchange pipe (19) disposed at a predetermined length portion on the refrigerant outlet (9) side in the second space (34) of the header body (25) of the refrigerant outlet header portion (6), here the right end portion. The passage cross-sectional area of the portion closer to the refrigerant outlet (9) than) gradually increases toward the refrigerant outlet (9). The right end of the first space (32) is closed by the inclined portion (48).

  In addition, the two portions (32), (34) of the header portion main body (25) are passed through a portion of the rear portion of the partition member (36) of the refrigerant outlet header portion (6) excluding the portions near the left and right ends. A plurality of oblong refrigerant passage holes (51A) (51B) are formed at intervals in the left-right direction.

  The first members (37) and (38) that form the header body (24) and (25) of the refrigerant inlet header (5) and the refrigerant outlet header (6), and the second members (39) and (41) Are integrally connected by connecting walls (52) and (53) constituting the connecting portion (7), thereby forming a first tank constituent member (55) and a second tank constituent member (56). Yes. In addition, the partition members (35) and (36) of the refrigerant inlet header portion (5) and the refrigerant outlet header portion (6) are connected together including the bent portions (43) and (48) and the close contact portions (44) and (49). The third tank constituting member (57) is formed by being integrally connected by a connecting wall (54) constituting the portion (7). Here, the first tank component (55) in which the first members (37) and (38) of the header sections (24) and (25) and the connecting wall (52) are integrated has a brazing filler metal layer on both sides. The aluminum brazing sheet is formed by pressing. The upper end portion of the heat exchange pipe (19) is brazed to the first tank constituent member (55) using the brazing material layer of the first tank constituent member (55). Further, the second tank component (56) in which the second members (39) (41) and the connecting wall (53) of both header sections (24) and (25) are integrated has a brazing filler metal layer on both sides. The aluminum brazing sheet is formed by pressing. Further, the third tank constituent member (57) in which the partition members (35) and (36) and the connecting wall (54) are integrated is pressed into an aluminum brazing sheet or an aluminum bare material having a brazing filler metal layer on both sides. It is formed by applying.

  Caps (26) and (28) for closing the right end openings of both header parts (24) and (25) are predetermined parts near the right ends of the second members (39) and (41) of the header parts (24) and (25), respectively. The space surrounded by the length portion and the close contact portions (44) (49) of the partition members (35) (36), that is, the right end of the second space (33) (34) of the header body (24) (25) Protruding portions (26a) and (28a) that are fitted into a predetermined length portion close to each other, and both caps (26) and (28) are integrated by a connecting portion (58) so that both header body parts (24) One right end member (59) brazed across (25) is formed. A refrigerant inlet leading to the second space (33) of the header main body (24) of the refrigerant inlet header (5) on the protruding end wall of the protruding part (26a) of the front cap (26) of the right end member (59) (8) is formed, and the refrigerant flow leading to the second space (34) of the header part body (25) of the refrigerant outlet header part (6) is formed on the protruding end wall of the protrusion part (28a) of the rear cap (28). An outlet (9) is formed.

  The opening area of the refrigerant inflow port (8) is the left-side part (the first side) of the bent part (43) of the partition member (35) in the second space (33) of the header part body (25) of the refrigerant inlet header part (5). It is larger than the cross-sectional area of the passage of the two spaces (33) in the longitudinal direction.

  The opening area of the refrigerant outlet (9) is the left-side part (the first part) of the inclined part (48) of the partition member (36) in the second space (34) of the header part body (25) of the refrigerant outlet header part (6). It is larger than the cross-sectional area of the passage in the longitudinal direction of the two spaces (34).

  An aluminum bare joint plate (61) having a refrigerant inlet (62) leading to the refrigerant inlet (8) and a refrigerant outlet (63) leading to the refrigerant outlet (9) is connected to the right end member (59). It is attached. One end of the refrigerant inlet pipe (11) is inserted into the refrigerant inflow part (62) of the joint plate (61) and brazed, and the other end of the refrigerant outlet pipe (12) is also connected to the refrigerant outflow part (63). It is inserted and brazed.

  Here, as shown by a chain line in FIG. 6, when viewed from the second space (33) of the header body (25) of the refrigerant inlet header (5), the refrigerant flow path in the refrigerant inlet pipe (11). The opening at the end of the refrigerant inlet header (5) side of (11a) is located within the range of the refrigerant inlet (8). Further, when viewed from within the second space (34) of the header section body (25) of the refrigerant outlet header section (6), the refrigerant outlet header section (6) of the refrigerant flow path (12a) in the refrigerant outlet pipe (12). The opening at the side end is located within the range of the refrigerant outlet (9).

  The caps (27) and (29) that close the left end opening of both header sections (24) and (25) are the portions near the left end of the second space (33) and (34) of the header sections (24) and (25), respectively. Upper protrusions (27a) (29a) that can be fitted into the lower protrusions (27b) (29b), which are also fitted in the portions near the left end of the first space (31) (32). When the caps (27) and (29) are integrated by the connecting portion (64), a single left end member (65) brazed across the header main bodies (24) and (25) is formed. Is formed.

  The first intermediate header portion (13) and the second intermediate header portion (14) of the second header tank (3) are respectively composed of a header portion main body (24) (25) opened at both ends, and both header portion main bodies (24). The caps (26), (27), (28), and (29) that close the opening on both ends of (25) and the header body (24) and (25) are located on the heat exchange core (4) side (upper side) The first space (31) (32) through which the heat exchange pipe (19) communicates with the second space (33) (34) located on the opposite side (lower side) of the heat exchange core (4). It consists of partition members (35) and (36) that partition, and has the same configuration as the first header tank (2), and is arranged upside down from the first header tank (2). The same parts are denoted by the same reference numerals.

  The first members (37) and (38) of each header section main body (24) and (25) of the second header tank (3) are the heat exchange core section (4) side of the header section main bodies (24) and (25). The lower part of the heat exchange pipe (19) of the front and rear heat exchange pipe group (21) is connected, and the second members (39) and (41) are also connected to each header part main body. (24) The remaining part (lower part) of (25) is formed.

  As shown in FIG. 2, FIG. 3, FIG. 5, FIG. 7 and FIG. 9, the difference between the second header tank (3) and the first header tank (2) is as follows.

  The first difference is that the refrigerant outlet (16) is formed on the protruding end wall of the protruding portion (26a) of the cap (26) that closes the right end opening of the header portion main body (24) of the first intermediate header portion (13). A refrigerant inlet (17) is formed in the protruding end wall of the protruding portion (28a) of the cap (28) that is formed and closes the right end opening of the header body (25) of the second intermediate header portion (14). That is.

  Here, since the opening area of the refrigerant inlet (17) is the same as the opening area of the refrigerant outlet (9), the opening area of the refrigerant inlet (17) is the header of the second intermediate header (14). It is larger than the passage cross-sectional area of the left side portion (intermediate portion in the longitudinal direction of the second space (34)) of the inclined portion (48) of the partition member (36) in the second space (34) of the main body (25). ing.

  The second difference is that the outer shape of the right end member (59) brazed across the header section main bodies (24) and (25) of the first and second intermediate header sections (13) and (14) is the refrigerant inlet. The right end member (59) differs from the outer shape of the right end member (59) brazed across the header part main body (24) (25) of the header part (5) and the refrigerant outlet header part (6). In addition, instead of the joint plate (61), a passage (66) through which the inside passes through the refrigerant outlet (16) of the first intermediate header portion (13) and the refrigerant inlet (17) of the second intermediate header portion (14) The communicating member (18) having the outwardly bulging portion (18a) that has been formed in () is brazed.

  The third difference is that the communication port (45), the guide part (46), and the circular coolant passage hole (47) are formed in the partition member (35) of the header part body (24) of the first intermediate header part (13). A long communication hole (67) is formed in the front-rear direction through which the first and second spaces (31), (33) of the header section main body (24) of the first intermediate header section (13) are passed. It is in.

  The fourth difference is that the oblong coolant passage holes (51A) and (51B) are not formed in the partition member (36) of the header section body (25) of the second intermediate header section (14), and a plurality of circular shapes are formed. The refrigerant passage hole (68) is formed in a penetrating manner with a space in the left-right direction.

  The above-mentioned evaporator (1) is assembled with all parts except the inlet pipe (11) and outlet pipe (12), then temporarily fixed with an appropriate jig, and all parts are brazed together in the furnace. It is manufactured by doing.

  The evaporator (1) constitutes a refrigeration cycle using a chlorofluorocarbon refrigerant together with a compressor and a condenser as a refrigerant cooler, and is mounted on a vehicle such as an automobile as a car air conditioner.

  In the above-described evaporator (1), when the compressor is turned on, the gas-liquid mixed phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve flows from the refrigerant flow path (11a) of the refrigerant inlet pipe (11) to the joint plate. (61) passes through the refrigerant inlet (62), passes through the refrigerant inlet (8) of the front cap (26) of the right end member (59), and enters the second space (33) of the refrigerant inlet header (5). enter. The refrigerant that has entered the second space (33) flows in the second space (33) in the length direction of the refrigerant inlet header (5), passes through the communication port (45), and enters the first space (31). And flows into the first space (31) through the circular refrigerant passage hole (47), and is divided and flows into the heat exchange pipe (19) of the front heat exchange pipe group (21).

  The refrigerant flowing into the heat exchange pipe (19) flows downward in the heat exchange pipe (19) and enters the first space (31) of the first intermediate header portion (13) of the second header tank (3). And enters the second space (33) through the communication hole (67) of the partition member (35) of the first intermediate header (13). The refrigerant that has entered the second space (33) flows in the second space (33) in the length direction of the first intermediate header (13), and the refrigerant in the front cap (26) of the right end member (59). The second space (34) of the second intermediate header (14) enters the passage (66) of the communication member (18) through the outlet (16), passes through the refrigerant inlet (17) of the rear cap (28). Get inside. The refrigerant that has entered the second space (34) of the second intermediate header portion (14) enters the first space (32) through the circular refrigerant passage hole (68) of the partition member (36) and is divided. And flows into the heat exchange pipe (19) of the rear heat exchange pipe group (21).

  The refrigerant flowing into the heat exchange pipe (19) flows upward in the heat exchange pipe (19) and enters the first space (32) of the refrigerant outlet header (6), and the length of the partition member (36). It enters the second space (34) through the circular refrigerant passage holes (51A) (51B). The refrigerant that has entered the second space (34) of the refrigerant outlet header (6) flows to the right, the refrigerant outlet (9) of the rear cap (28) of the right end member (59), and the joint plate (61). The refrigerant flows through the refrigerant outflow portion (63) and flows out into the refrigerant flow path (12a) of the refrigerant outlet pipe (12).

  While the refrigerant flows in the heat exchange pipe (19) of the front and rear heat exchange pipe group (21), the refrigerant exchanges heat with the air passing through the ventilation gap of the heat exchange core section (4). And leaked.

  In the above embodiment, the refrigerant inlet pipe (11) is connected to the refrigerant inlet header (5) of the first header tank (2), and the refrigerant outlet pipe (12) is connected to the refrigerant outlet header (6). However, the present invention is not limited to this, and an inflow path and a refrigerant that are formed by stacking a plurality of plates and communicate with the refrigerant inlet (8) of the refrigerant inlet header (5) between adjacent plates. A refrigerant inlet / outlet member having an outflow path leading to the refrigerant outlet (9) of the outlet header section (6) may be connected to the first header tank (2). In this case, the inlet and outlet passages of the refrigerant inlet / outlet member are provided outside the refrigerant inlet header (5) and outside the refrigerant outlet header (6), and the refrigerant inlet (8) and the refrigerant outlet ( The refrigerant flow path is provided so as to communicate with 9).

  Moreover, in the said embodiment, while the whole leeward header part of a 1st header tank (2) becomes a refrigerant | coolant inlet header part, the whole leeward header part becomes a refrigerant | coolant outlet header part, and the 2nd header tank (3 ) The entire leeward header portion is the first intermediate header portion and the entire leeward header portion is the second intermediate header portion, but is not limited thereto. For example, in the leeward header portion of the first header tank (2), a plurality of compartments are provided side by side in the length direction of the first header tank (2), and one of the compartments is a refrigerant inlet header portion. Similarly, a plurality of sections are provided in the windward header section along the length direction of the first header tank (2), and one of the sections may be a refrigerant outlet header section.

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

(1): Evaporator (heat exchanger)
(2): First header tank
(4): Heat exchange core
(6): Refrigerant inlet header
(8): Refrigerant inlet
(11): Refrigerant inlet pipe
(11a): Refrigerant flow path
(14): Second intermediate header
(17): Refrigerant inlet
(19): Heat exchange pipe
(24) (25): Header body
(26) (27) (28) (29): Cap
(31) (32): 1st space
(33) (34): Second space
(35) (36): Partition member
(43): Bent part

Claims (6)

A heat exchange core portion having a plurality of heat exchange tubes arranged in the same longitudinal direction, and a refrigerant flow at one end of the heat exchange core portion at least one side of the heat exchange tube in the longitudinal direction. A header portion having an inlet, and a header portion having a refrigerant inflow port, a header portion body having both ends opened, a cap for closing both end openings of the header portion body, and the inside of the header portion body located on the heat exchange core portion side And a partition member that divides the first space through which the heat exchange pipe communicates and the second space located on the opposite side of the heat exchange core portion, and the refrigerant inlet closes both end openings of the header portion main body. A heat exchanger formed in one of the two caps so as to communicate with the second space of the header body,
A heat exchanger in which an opening area of the refrigerant inlet is larger than a passage cross-sectional area of an intermediate portion in a longitudinal direction in the second space through which the refrigerant inlet communicates. The passage cross-sectional area of a predetermined length portion on the refrigerant inlet side in the second space through which the refrigerant inlet communicates has a largest refrigerant inlet side end and gradually decreases inward. Heat exchanger. A plurality of refrigerant passage holes are formed in the partition member at intervals in the length direction of the header section main body. From the refrigerant passage holes located at the end on the refrigerant inlet side in the first space through which the heat exchange pipe communicates The heat exchanger according to claim 2, wherein a passage sectional area of a portion on the refrigerant inlet side gradually decreases toward the refrigerant inlet. 4. The heat exchanger according to claim 2, wherein a bent portion that is bent toward the heat exchange pipe toward the refrigerant inlet is provided at a predetermined length portion on the refrigerant inlet side of the partition member. The heat exchanger according to claim 4, wherein the bent portion is curved toward the heat exchange pipe toward the refrigerant inlet, and a surface opposite to the heat exchange pipe is a convex surface. The refrigerant flow path leading to the refrigerant flow inlet is provided outside the header portion having the refrigerant flow inlet, and when viewed from the second space of the header section main body leading to the refrigerant flow inlet, the header portion of the refrigerant flow path The heat exchanger according to any one of claims 1 to 5, wherein the side end opening is located within the range of the refrigerant inlet.

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