JP2018119747A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of unifying a refrigerant amount flowing in heat exchange tubes of two descent flow tube groups, which constitute one path and are juxtaposed in a ventilation direction.SOLUTION: First to third tube groups 16-18 are provided in a leeward side tube row 3 of an evaporator 1, and fourth and fifth tube groups 19, 21 are provided on a windward side tube row 4. One path is constituted by the third and fourth tube groups 18, 19, which are descend flow tube groups juxtaposed in a ventilation direction. An upper end part of a third tube group 18 is communicated with a first outflow portion 34 of a third section 24 of a leeward side upper header part 5, and a lower end part of the third tube group 18 is communicated with a fourth section 27 of a leeward side lower header part 6. In at least one of the first outflow portion 34 of the third section 24 and the fourth section 27, provided are resistance imparting parts 36, 40 configured to impart resistance to flow of refrigerant in a heat exchange tube 2 of the third tube group 18.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 this specification and claims, the top and bottom, left and right in FIGS. 1 to 3 are referred to as top and bottom and left and right, and the direction indicated by the arrow X in FIGS.

  As this type of evaporator, the leeward side and the windward side tube row, which is composed of a plurality of heat exchange tubes with the longitudinal direction oriented in the vertical direction and spaced in the left-right direction, and provided side by side in the ventilation direction, It is equipped with both leeward side and leeward upper and lower header sections that are extended in the left and right direction through which the upper and lower ends of the heat exchange tubes of the leeward side and the windward side tube row are connected. And a downflow tube group in which the refrigerant flows from the top to the bottom and an upflow tube group in which the refrigerant flows from the bottom to the top are alternately arranged, and there are three or more tube groups in the leeward tube row and the wind There is one tube group in the upper tube row that is one less than the number of tube groups in the leeward tube row, and the windward windward side of one downflow tube group in the leeward tube row One downflow tube group in the tube row is disposed, and one downflow tube group includes one path, and the downflow tube group and the downflow tube group constituting the one path in the leeward side tube row The upper end portion of the upflow tube group adjacent to the upstream side in the refrigerant flow direction is connected to one upper leeward section provided in the leeward upper header portion and closed at both ends, and The upper end portion of the downflow tube group constituting the path is provided in the upwind header section and is closed at both ends, and communicates with one upper upwind section that is shorter in the left-right direction than the upper upwind section. A first inflow portion in which the upflow tube group is communicated with the upper leeward section and the refrigerant flows in from the heat exchange tube of the upflow tube group; And a first outflow portion through which the refrigerant flows out to the heat exchange tubes of the downflow tube group, the entire first inflow portion and the first outflow portion of the upper leeward section, and the upper upwind section. The whole is a single space, and the first outflow portion of the upper leeward section and the upper windward section are communicated by the first refrigerant passage portion, and the downward flow constituting the one path in the leeward tube row The lower end portion of the tube group is connected to one lower leeward section provided in the leeward lower header portion and closed at both ends, and the downflow tube group constituting the one path in the windward tube row and the The lower end portion of the upflow tube group adjacent to the downstream side in the refrigerant flow direction of the downflow tube group is provided in the upwind lower header portion, and both ends are closed and the lower leeward section is more than A second upwind section that is long in the left-right direction is connected to the lower upwind section. The downflow tube group is connected to the lower upwind section, and the refrigerant flows in from the heat exchange tube of the downflow tube group. There is an inflow portion and a second outflow portion through which the upflow tube group is communicated and the refrigerant flows out to the heat exchange tube of the upflow tube group, and the entire lower leeward section and the second downwind section An evaporator in which the entire inflow portion and the second outflow portion are each one space, and the second inflow portion of the lower leeward compartment and the lower upwind compartment are communicated by the second refrigerant passage portion is known. (See Patent Document 1).

  However, in the evaporator described in Patent Document 1, in the upper leeward section of the leeward upper header section, the refrigerant that has flowed from the intermediate tube group of the leeward tube row into the inflow portion of the upper leeward section flows to the farthest tube group side. In this case, it is easy to flow to the back side (downstream in the flow direction in the upper leeward section) due to inertia, so that all of the farthest tube group of the windward tube row passes through the refrigerant passage and enters the upper windward section. There is a tendency that the amount of refrigerant flowing into the total heat exchange tubes of the farthest tube group in the leeward side tube row is larger than the amount of refrigerant flowing into the heat exchange tubes. Therefore, the amount of the refrigerant flowing in the total heat exchange tubes of both the farthest tube groups becomes non-uniform, and there is a possibility that the cooling performance is deteriorated.

JP 2009-156532 A

  The object of the present invention is to solve the above-mentioned problem and to improve the cooling performance by equalizing the amount of refrigerant flowing in the heat exchange tubes of the two downflow tube groups provided side by side in the ventilation direction and constituting one path. It is to provide an evaporator that can be used.

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

1) The leeward side and the windward side tube row, which is composed of a plurality of heat exchange tubes arranged in the longitudinal direction and spaced apart in the left-right direction, and arranged side by side in the ventilation direction, the leeward side and the wind The heat exchanger tubes of the upper tube row are provided with a long leeward side in the left-right direction through which the upper and lower ends of the heat exchange tubes are connected, and both upper and lower header portions on the windward side. Downflow tube groups flowing from top to bottom and upflow tube groups from which the refrigerant flows from bottom to top are alternately arranged, and there are three or more tube groups in the leeward tube row and in the windward tube row There is one tube group less than the number of tube groups in the leeward tube row, and one downflow in the leeward tube row on the windward side of one downflow tube group in the leeward tube row A tube group is arranged, and both downflow tube groups constitute one path, and the downflow tube group constituting the one path in the leeward tube row and the upstream side in the refrigerant flow direction of the downflow tube group Downward flow tubes constituting the one path in the windward tube row, wherein upper ends of adjacent upflow tube groups are connected to one upper leeward section provided in the leeward upper header portion and closed at both ends. The upper end of the group is provided in the upwind header section, and both ends are closed, and the length of the left and right direction is shorter than that of the upper upwind section. The first inflow portion through which the upflow tube group is communicated and the refrigerant flows in from the heat exchange tube of the upflow tube group, and the downflow tube group are communicated and descended The heat exchange tube of the flow tube group has a first outflow portion through which the refrigerant flows out, and the entire first inflow portion and the first outflow portion of the upper leeward section and the entire upper windward section are each one space. The first outflow portion of the upper leeward section and the upper windward section are communicated by the first refrigerant passage portion, and the lower end portion of the downflow tube group constituting the one path in the leeward tube row is leeward Downflow tube group that is provided in the lower header section and communicates with one lower leeward section that is closed at both ends, and constitutes the one path in the windward tube row, and the refrigerant flow direction of the downflow tube group The lower end portion of the upstream tube group adjacent to the downstream side is provided in the windward lower header portion, and both ends are closed and the length in the left-right direction is longer than the lower leeward section. The upflow tube group communicates with the second inflow portion through which the downflow tube group is communicated with the side upwind section, the downflow tube group is communicated, and the refrigerant flows from the heat exchange tube of the downflow tube group. And a second outflow portion from which the refrigerant flows out to the heat exchange tubes of the upflow tube group, and the entire lower leeward section and the entire second inflow portion and second outflow portion of the lower upwind section Each of the evaporators is an evaporator in which the second inflow section of the lower leeward section and the lower leeward section are communicated by the second refrigerant passage section,
At least one of the first outflow portion of the upper leeward section and the lower leeward section is given resistance to the refrigerant flow in the heat exchange tubes of the downflow tube group constituting the one path in the leeward tube row. An evaporator provided with a resistance applying portion.

  2) The first resistance imparting portion that suppresses the inflow of the refrigerant into the heat exchange tube of the downflow tube group leading to the first outflow portion is provided at the first outflow portion of the upper leeward section of at least some of the heat exchange tubes. The evaporator according to the above item 1), which is provided directly above with a gap.

  3) A partition portion is provided between the upper windward section and the upper windward section, and a plurality of first refrigerant passage portions including through holes are formed in the partition portion at intervals in the left-right direction. The evaporator according to 2) above, wherein a plate-like first resistance applying portion is integrally provided at a lower end portion of the refrigerant passage portion.

  4) In the lower leeward section, a second resistance imparting portion that suppresses the outflow of the refrigerant from the heat exchange tubes of the downflow tube group leading to the lower leeward section has an interval directly below at least some of the heat exchange tubes. The evaporator according to any one of 1) to 3) provided above.

  5) A partition portion is provided between the lower leeward compartment and the lower windward compartment, and a plurality of second refrigerant passage portions including through holes are formed in the partition portion at intervals in the left-right direction. The evaporator according to 4) above, wherein a plate-like second resistance applying portion is integrally provided at an upper end portion of at least a part of the second refrigerant passage portion.

  6) A refrigerant inlet is provided at one end of the leeward upper header portion, a refrigerant outlet is provided at the same end as the refrigerant inlet of the leeward upper header portion, three tube groups are provided in the leeward tube row, and the refrigerant inlet The most recent tube group closest to and the farthest tube group farthest from the refrigerant inlet is the downflow tube group, and two tube groups are provided in the windward tube row, and the farthest tube group farthest from the refrigerant outlet is the downward flow The evaporator according to any one of the above 1) to 5), which is a tube group, and one path is configured by the farthest tube groups of both tube rows.

  According to the evaporators of 1) to 6) above, at least one of the first outflow portion of the upper leeward section and the lower leeward section has the downflow tube group constituting the one path in the leeward side tube row. Since the resistance imparting portion for imparting resistance to the flow of the refrigerant in the heat exchange tube is provided, the downflow tube communicated with the first outflow portion of the upper leeward section of the leeward side tube row by the action of the resistance imparting portion. In the heat exchange tube of the downflow tube group, the amount of the refrigerant flowing into the heat exchange tube of the group is reduced, and enters the upper windward section through the first refrigerant passage and communicates with the upper windward section. The amount of refrigerant flowing into the tank increases. Therefore, it becomes possible to equalize the amount of refrigerant flowing through the total heat exchange tubes of the downflow tube group constituting the one path in the leeward and upwind tube rows, and the cooling performance of the evaporator is excellent. Become.

  According to the evaporator of 2), it is possible to effectively reduce the amount of refrigerant flowing into the heat exchange tubes of the downflow tube group communicating with the first outflow portion of the upper leeward section of the leeward tube row. Become.

  According to the evaporator of the above 3), the first refrigerant passage portion and the plate-like first resistance applying portion formed of the through holes can be formed simultaneously by cutting and bending.

  According to the evaporator of the above 4), it is possible to effectively reduce the amount of the refrigerant flowing into the heat exchange tube of the downflow tube group communicating with the first outflow portion of the upper leeward section of the leeward tube row. Become.

  According to the evaporator 5), the second coolant passage portion and the plate-like second resistance imparting portion formed of the through holes can be formed simultaneously by cutting and bending.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to the present invention. FIG. 2 is a perspective view schematically showing the overall configuration of the evaporator of FIG. 1 and showing the flow of refrigerant. 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. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG.

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

  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 present invention, and FIGS. 5 and 6 show the configuration of the main part thereof. In addition, in FIG. 2, specific illustrations, such as a heat exchange tube and a fin, are abbreviate | omitted.

  1 to 4, the evaporator (1) has a lateral direction (perpendicular to the ventilation direction) with the width direction directed to the ventilation direction indicated by the arrow X in FIGS. 1 and 2 and the longitudinal direction directed to the vertical direction. The leeward side tube row (3) and the windward side tube row (4) consisting of a plurality of flat aluminum heat exchange tubes (2) spaced apart in the direction) and the heat of the leeward side tube row (3). Arranged on the upper and lower ends of the exchange tube (2) with the longitudinal direction in the left-right direction (the direction in which the heat exchange tubes (2) are aligned), and the total heat exchange tubes (2) in the leeward tube row (3) are connected The longitudinal direction of the aluminum leeward upper header part (5) and the aluminum leeward lower header part (6) and the heat exchange tubes (2) of the windward tube row (4) And the total heat exchange tubes (2) in the windward tube row (4) are connected. In this aluminum windward upper header portion (7) and windward lower header portion and a (8).

  The leeward upper header (5) and the windward upper header (7), and the leeward lower header (6) and the windward lower header (8) are, for example, in one tank (9) (11). Is divided into two spaces in the ventilation direction by plate-like partition portions (9a) and (11a) extending in the left-right direction. A refrigerant inlet (12) is provided at the right end of the leeward upper header portion (5), and a refrigerant outlet (13) is provided at the right end of the leeward upper header portion (7). The total heat exchange tubes (2) of the leeward side tube row (3) and the leeward side tube row (4) have fixed length portions near both the upper and lower ends, the upper header portions (5) (7) and the lower header portions. (6) In the state inserted in (8), it is joined to both tanks (9) and (11) by brazing material (hereinafter, joining by brazing material is referred to as brazing). The upper ends of the total heat exchange tubes (2) of the leeward tube row (3) and the windward tube row (4) are in the upper header portions (5) and (7), and the lower end portions are the lower header portions. (6) Located in (8), the upper end and the lower end of the total heat exchange tube (2) are at the same height. The height position of the upper end and the height position of the lower end of the total heat exchange tube (2) may be slightly different. Further, the number of heat exchange tubes (2) in the leeward tube row (3) is equal to the number of heat exchange tubes (2) in the windward tube row (4).

  The heat in both tube rows (3) and (4) is placed outside the ventilation gap between adjacent heat exchange tubes (2) in both tube rows (3) and (4) and outside the heat exchange tubes (2) on both left and right ends. Aluminum corrugated fins (14) are placed so as to be shared across the exchange tube (2), brazed to both heat exchange tubes (2), and made of aluminum on the outside of the corrugated fins (14) at both ends A side plate (15) is disposed and brazed to the corrugated fin (14). A ventilation gap is also formed between the heat exchange tubes (2) at the left and right ends and the side plates (15). The air that has passed through the ventilation gap between adjacent heat exchange tubes (2) in both tube rows (3) and (4) is sent into the vehicle compartment of the vehicle in which the vehicle air conditioner is mounted.

  In the leeward side tube row (3), an odd number of three or more, in this case, three tube groups (16), (17), (18) made up of a plurality of heat exchange tubes (2) arranged in succession, are connected to the refrigerant inlet (12 ) Provided side by side from the side end (right end) toward the other end side (left end), consisting of a plurality of heat exchange tubes (2) continuously arranged in the windward tube row (4) and The tube group (16), (17), (18) in the leeward side tube row (3) is one less than the tube group (16), (17), (18), here two tube groups (19) (21) are on the opposite side of the refrigerant outlet (13) They are arranged side by side from the end (left end) toward the refrigerant outlet (13) side end (right end). Hereinafter, the three tube groups (16), (17), (18) of the leeward side tube row (3) are moved from the refrigerant inlet (12) side end (right end) toward the other end (left end). It is called the 3rd tube group, and the 2nd tube group (19) (21) of the windward tube row (4) is the 4th and 5th tube group from the opposite end to the right end from the refrigerant outlet (13). Let's say.

  The first tube group (16) is the nearest tube group closest to the refrigerant inlet (12) in the leeward side tube row (3), and the third tube group (18) is the leeward side tube row (3). This is the farthest tube group located farthest from the refrigerant inlet (12). The fourth tube group (19) is the farthest tube group located farthest from the refrigerant outlet (13) in the windward tube row (4), and the fifth tube group (21) is the refrigerant outlet (13 ) Is the nearest tube group located closest to. The total number of heat exchange tubes (2) constituting the first and second tube groups (16), (17) of the leeward tube row (3) is the fifth tube group (21) of the leeward tube row (4). The total width in the left and right direction of the first and second tube groups (16) and (17) is equal to the width in the left and right direction of the fifth tube group (21). Is the same. The number of heat exchange tubes (2) constituting the third tube group (18) of the leeward tube row (3) is the number of heat exchange tubes (4) constituting the fourth tube group (19) of the leeward tube row (4) ( It is equal to the number of 2), and the width in the left-right direction of both tube groups (18) and (19) is the same.

  The leeward side upper header part (5) is divided into two sections (23) and (24) arranged in the left-right direction by a plate-like divided part (22), so that the leeward side upper header part (5) Heat exchange between the compartment (23) leading to the refrigerant inlet (12) and the upper end of the heat exchange tube (2) of the first tube group (16) and the second and third tube groups (17) (18) The upper end of the tube (2) is connected to the compartment (24), and the leeward side lower header (6) is divided into two compartments (26) and (27) aligned in the left-right direction by the dividing part (25). By doing so, a section (26) through which the lower end of the heat exchange tube (2) of the first and second tube groups (16), (17) communicates with the leeward lower header section (6), and the third tube group A section (27) through which the lower end of the heat exchange tube (2) of (18) communicates is provided. Further, the upwind header section (7) is divided into two sections (29) and (31) arranged in the left-right direction by the dividing section (28), so that the upwind header section (7) The upper end of the heat exchange tube (2) of the fifth tube group (21) and the compartment (29) through which the upper end of the heat exchange tube (2) of the four tube group (19) communicates and the refrigerant outlet (13) And a section (31) through which is communicated. Further, a section (32) through which the lower end of the heat exchange tube (2) of the fourth and fifth tube groups (19) (21) communicates is provided in the entire windward lower header section (8).

  Hereinafter, the section (23) which leads to the refrigerant inlet (12) of the leeward upper header section (5) and the upper end of the heat exchange tube (2) of the first tube group (16) is defined as the first section, the leeward lower section. The section (26) through which the lower end of the heat exchange tube (2) of the first and second tube groups (16), (17) of the header section (6) communicates is the second section, and the leeward side upper header section (5) is the second section. 2 and the third tube group (17) (18), the section (24) through which the upper end of the heat exchange tube (2) communicates is the third section, and the third tube group (18) of the leeward lower header section (6). The section (27) through which the lower end of the heat exchange tube (2) communicates is the fourth section, and the section through which the upper end of the heat exchange tube (2) of the fourth tube group (19) of the upwind header section (7) communicates ( 29) is the fifth section, and the section (32) through which the lower ends of the heat exchange tubes (2) of the fourth and fifth tube groups (19), (21) of the windward lower header section (8) communicate is the sixth section, It leads to the refrigerant outlet (13) of the windward upper header (7) and It will be referred to the seventh compartment upper end communicating compartments (31) of the group (21).

  The third section (24) is connected to the first inflow portion (33) through which the second tube group (17) is communicated and the refrigerant flows from the heat exchange tube (2) of the second tube group (17). There is a first outflow portion (34) through which the three tube group (18) is communicated and into which the refrigerant flows out to the heat exchange tube (2) of the third tube group (18). The first inflow portion (33) and the first outflow portion (34) each have a single internal space, and the right end portion of the first outflow portion (34) is the first inflow portion (33). To the left end of

  The first outflow part (34) and the fifth section (29) of the third section (24) are formed in the upper tank (9) into the leeward upper header section (5) and the leeward upper header section (7). The partition part (9a) to be divided is communicated by a plurality of first refrigerant passage parts (35) made of rectangular through holes formed at intervals in the left-right direction. The lower ends of the first refrigerant passage portions (35) are spaced above the bottom surfaces of the internal spaces of the third compartment (24) and the fifth compartment (29), and the lower ends of all the first refrigerant passage portions (35). Are at the same height.

  A plate-like shape that suppresses the inflow of refrigerant into the heat exchange tube (2) of the third tube group (18) leading to the first outflow portion (34) in the first outflow portion (34) of the third section (24). The first resistance applying portion (36) is provided at an interval directly above at least a part of the heat exchange tubes (2). In this embodiment, all the first resistance applying portions (36) are provided so as to be located immediately above the heat exchange tube (2). The first resistance applying section (36) is a first refrigerant passage section (9a) that divides the upper tank (9) into a leeward upper header section (5) and an leeward upper header section (7). 35) at the lower end. For example, the first refrigerant passage part (35) and the first resistance application part (36) are simultaneously formed by cutting and bending the partition part (9a) of the upper tank (9).

  The sixth section (32) is connected to the second inflow portion (37) through which the fourth tube group (19) is communicated and the refrigerant flows from the heat exchange tube (2) of the fourth tube group (19). There is a second outflow portion (38) through which the five tube group (21) is passed and the refrigerant flows out to the heat exchange tube (2) of the fifth tube group (21). The second inflow portion (37) and the second outflow portion (38) each have a single internal space, and the left end portion of the second outflow portion (38) is the second inflow portion (37). Is connected to the right end.

  The second inflow portion (37) of the fourth section (27) and the sixth section (32) is formed in the lower tank (11) with the leeward lower header section (6) and the leeward lower header section (8). The partition part (11a) is divided into a plurality of second refrigerant passage parts (39) composed of rectangular through holes formed at intervals in the left-right direction. The upper ends of the second refrigerant passage portions (39) are spaced below the upper surfaces of the internal spaces of the fourth compartment (27) and the sixth compartment (32), and the upper ends of all the second refrigerant passage portions (39). Are at the same height.

  A plate-like second resistance applying portion (40) for suppressing the inflow of the refrigerant into the heat exchange tube (2) of the third tube group (18) leading to the fourth compartment (27) in the fourth compartment (27). However, at least a part of the heat exchange tube (2) is provided at an interval. In this embodiment, all the second resistance applying portions (40) are provided so as to be located directly below the heat exchange tube (2). The second resistance applying section (40) is a second refrigerant passage section in the partition section (11a) that divides the lower tank (11) into a leeward lower header section (6) and an leeward lower header section (8). (39) is provided at the upper end portion. For example, the second refrigerant passage part (39) and the second resistance application part (40) are formed simultaneously by cutting and bending the partition part (11a) of the lower tank (11).

  As described above, the refrigerant inlet (12), the refrigerant outlet (13), the first to fifth tube groups (16) (17) (18) (19) (21), the first to seventh sections (23) ( 26) (24) (27) (29) (32) (31) and the first to second refrigerant passage portions (35) (39) are provided, so that the refrigerant can be supplied to the leeward side tube row (3). The first tube group (16) which is the latest tube group, the third tube group (18) which is the farthest tube group of the leeward side tube row (3), and the farthest tube group which is the farthest tube group of the upwind tube row (4). The four-tube group (19) flows through the heat exchange tube (2) from the top to the bottom, and these tube groups (16), (18), and (19) are downflow tube groups. The refrigerant flows from the bottom to the top in the heat exchange tubes (2) of the second tube group (17) of the leeward tube row (3) and the fifth tube group (21) of the windward tube row (4). These tube groups (17) and (21) are the upward flow tube groups. Therefore, both the tube rows (3) and (4) are composed of a plurality of heat exchange tubes (2) and a downflow tube group in which the refrigerant flows from top to bottom and an upflow tube group in which the refrigerant flows from bottom to top. It is provided so that it may line up alternately.

  That is, the fourth tube group (19), which is the downflow tube group of the windward tube row (4), is arranged on the windward side of the third tube group (18), which is the downflow tube group of the leeward tube row (3). In addition, one tube path is constituted by both tube groups (18) and (19), the upper end portion of the third tube group (18) is provided in the leeward upper header portion (5), and both ends are closed. The second upflow tube group is connected to the first outflow portion (34) of the third section (24), which is one upper leeward section, and is adjacent to the upstream side in the refrigerant flow direction of the third tube group (18). The upper end of the tube group (17) leads to the first inflow portion (33) of the third section (24), which is one upper leeward section provided at the leeward upper header section (5) and closed at both ends. It has been made. Further, the upper end portion of the fourth tube group (19), which is the downflow tube group constituting one path with the third tube group (18) in the upwind tube row (4), is connected to the upwind header portion (7). And is connected to a fifth section (29) which is one upper windward section whose both ends are closed and whose length in the left-right direction is shorter than that of the third section (24). Further, the lower end portion of the fourth tube group (19) is provided in the upwind lower header portion (8), and the second inflow of the sixth compartment (32) which is one lower upwind section closed at both ends. The lower end portion of the fifth tube group (21), which is an upflow tube group adjacent to the downstream side in the refrigerant flow direction of the fourth tube group (19), is connected to the portion (37), and the lower end portion of the sixth section (32) is 2 It leads to the outflow part (38). The remaining tube groups (16), (17) and (21) excluding the third and fourth tube groups (18) and (19) each constitute a single path.

  Therefore, the refrigerant flowing in from the refrigerant inlet (12) flows through the two paths as follows and flows out from the refrigerant outlet (13). The first path consists of the first section (23), the heat exchange tube (2) of the first tube group (16), the second section (26), the heat exchange tube (2) of the second tube group (17), The first inflow portion (33) of the third section (24), the first outflow portion (34) of the third section (24), the heat exchange tube (2) of the third tube group (18), the fourth section (27) ), Second refrigerant passage part (35), second inflow part (37) of sixth section (32), second outflow part (38) of sixth section (32), heat of fifth tube group (21). An exchange tube (2) and a seventh compartment (31). The second path consists of the first compartment (23), the heat exchange tube (2) of the first tube group (16), the second compartment (26), the heat exchange tube (2) of the second tube group (17), 1st inflow part (33) of 3rd division (24), 1st outflow part (34) of 3rd division (24), 1st refrigerant passage part (35), 5th division (29), 4th tube group Heat of the heat exchange tube (2) of (19), the second inflow portion (37) of the sixth section (32), the second outflow portion (38) of the sixth section (32), and the fifth tube group (21) An exchange tube (2) and a seventh compartment (31).

  The evaporator (1) described above constitutes a refrigeration cycle together with a compressor, a condenser as a refrigerant cooler, and an expansion valve as a decompressor, and is mounted on a vehicle, for example, an automobile, as a car air conditioner. During the operation of the car air conditioner, the refrigerant that has passed through the compressor, the condenser, and the expansion valve flows in from the refrigerant inlet (12) and out of the refrigerant outlet (13) through the above-described two paths, and the refrigerant is on the leeward side. While flowing in the heat exchange tube (2) of the tube row (3) and in the heat exchange tube (2) of the windward tube row (4), a ventilation gap between adjacent heat exchange tubes (2) is formed. It exchanges heat with the passing air, the air is cooled, and the refrigerant flows out as a gas phase. That is, in the evaporator (1) described above, the first outflow portion of the third section (24) of the leeward side tube row (3) is caused by the action of the first resistance applying portion (36) and the second resistance applying portion (40). The amount of refrigerant flowing into the heat exchange tube (2) of the third tube group (18) communicating with (33) is reduced, and the fifth section (29) is passed through the first refrigerant passage portion (35). ) And the amount of refrigerant flowing into the heat exchange tube (2) of the fourth tube group (19) leading to the fifth section (29) increases. As a result, the amount of refrigerant flowing through the total heat exchange tube (2) of the third tube group (18) and the total heat exchange tube of the fourth tube group (19) constituting one path with the third tube group (18). It becomes possible to equalize the amount of refrigerant flowing through (2). Therefore, the cooling performance of the evaporator (1) is excellent.

  In the above-described embodiment, the resistance applying portion (36) (not shown) is provided to both the first outflow portion (34) of the third section (24) that is the upper leeward section and the fourth section (27) that is the lower leeward section. 40) is provided, but the present invention is not limited to this, and the resistance applying portion is provided only in one of the first outflow part (34) and the fourth section (27) of the third section (24). It may be provided.

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

(1): Evaporator
(2): Heat exchange tube
(3): Downward tube row
(4): Windward tube row
(5): Upper header on the leeward side
(6): Downward header on the leeward side
(7): Upwind header
(8): Upwind lower header
(9a) (11a): Partition
(16) (17) (18): First to third tube groups
(19) (21): Fourth and fifth tube groups
(24): Third section (upper lee section)
(27): Fourth section (lower lee section)
(29): 5th section (upward windward section)
(32): 6th section (lower upwind section)
(33): First inflow part
(34): First outflow part
(35): First refrigerant passage
(36): 1st resistance provision part
(37): Second inflow part
(38): Second outflow part
(39): Second refrigerant passage
(40): Second resistance applying portion

Claims (6)

The leeward side and the windward side tube array, and the leeward side and the windward side tube, which are composed of a plurality of heat exchange tubes arranged in the vertical direction and spaced apart in the left-right direction and arranged in the ventilation direction. The upper and lower ends of the heat exchange tubes in the row are connected to both the leeward side and the upper side upper and lower header portions that are long in the left and right direction. The downflow tube group flowing from the bottom to the top and the upflow tube group from which the refrigerant flows from the bottom to the top are alternately arranged, and there are three or more tube groups in the leeward tube row and the leeward side in the leeward tube row There is one tube group less than the number of tube groups in the tube row, and one downflow channel in the upwind tube row is on the windward side of one downflow tube group in the leeward tube row. And a downstream path tube group, and a downstream flow tube group constituting the single path in the leeward side tube row and an upstream side in the refrigerant flow direction of the downward flow tube group The upper end portion of the upflow tube group adjacent to each other is connected to one upper leeward section provided in the leeward upper header portion and closed at both ends, and the lower flow constituting the one path in the windward tube row The upper end portion of the tube group is provided in the upwind header section, and both ends are closed, and the length in the left-right direction is shorter than that of the upper upwind section. The first inflow portion through which the upflow tube group is communicated and the refrigerant flows from the heat exchange tube of the upflow tube group, and the downflow tube group are communicated and descended The heat exchange tubes of the tube group have a first outflow portion through which the refrigerant flows out, and the entire first inflow portion and the first outflow portion of the upper leeward section and the entire upper windward section are each one space. The first outflow portion of the upper leeward section and the upper windward section are communicated by the first refrigerant passage portion, and the lower end portion of the downflow tube group constituting the one path in the leeward tube row is on the leeward side. Downstream tube group that is provided in the lower header portion and communicates with one lower leeward section whose both ends are closed and constitutes the one path in the windward tube row, and downstream of the downstream flow tube group in the refrigerant flow direction The lower end portion of the upflow tube group adjacent to the lower side is provided in the upwind lower header portion, and both ends are closed, and the lower side is longer in the left-right direction than the lower downwind section. The upflow tube group communicates with the second inflow portion through which the downflow tube group is communicated with the side upwind section, the downflow tube group is communicated, and the refrigerant flows from the heat exchange tube of the downflow tube group. And a second outflow portion from which the refrigerant flows out to the heat exchange tubes of the upflow tube group, and the entire lower leeward section and the entire second inflow portion and second outflow portion of the lower upwind section Each of the evaporators is an evaporator in which the second inflow section of the lower leeward section and the lower leeward section are communicated by the second refrigerant passage section,
At least one of the first outflow portion of the upper leeward section and the lower leeward section is given resistance to the refrigerant flow in the heat exchange tubes of the downflow tube group constituting the one path in the leeward tube row. An evaporator provided with a resistance applying portion. A first resistance imparting portion that suppresses the inflow of the refrigerant into the heat exchange tube of the downflow tube group that communicates with the first outflow portion is directly above the at least some of the heat exchange tubes in the first outflow portion of the upper leeward section. The evaporator according to claim 1, which is provided at intervals. A partition part is provided between the upper leeward section and the upper windward section, and a plurality of first refrigerant passage parts including through holes are formed in the partition part at intervals in the left-right direction. The evaporator according to claim 2, wherein a plate-like first resistance applying portion is integrally provided at a lower end portion of the refrigerant passage portion. In the lower leeward section, a second resistance imparting portion that suppresses the outflow of the refrigerant from the heat exchange tube of the downflow tube group leading to the lower leeward section is spaced at least immediately below some of the heat exchange tubes. The evaporator in any one of Claims 1-3 provided. A partition portion is provided between the lower leeward compartment and the lower windward compartment, and a plurality of second refrigerant passage portions including through holes are formed in the partition portion at intervals in the left-right direction. The evaporator of Claim 4 with which the plate-shaped 2nd resistance provision part is integrally provided in the upper end part of the 2nd refrigerant | coolant passage part of a part. A refrigerant inlet is provided at one end of the leeward upper header portion, a refrigerant outlet is provided at the same end as the refrigerant inlet of the leeward upper header portion, three tube groups are provided in the leeward tube row, and the refrigerant inlet is The nearest recent tube group and the farthest tube group farthest from the refrigerant inlet are the downflow tube groups, and two tube groups are provided in the windward tube row, and the farthest tube group farthest from the refrigerant outlet is the downflow tube group The evaporator according to any one of claims 1 to 5, wherein one path is constituted by the farthest tube groups of both tube rows.

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