JP2018119736A - 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 third section 24 of a leeward side upper header part 5, and an upper end part of the fourth tube group 19 is communicated with a fifth section 29 of a windward side upper header part 7. In an outflow portion 42 of the third section 24, a first portion 43 and a second portion 44 juxtaposed in a horizontal direction are provided. An inflow portion 41 side end part of the first portion 43 communicates with an outflow portion 42 side end part of the inflow portion 41. The first portion 43 and the second portion 44 are communicated with the fifth section 29 by refrigerant passage parts 34, 35, respectively.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 4 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 tube groups in the leeward tube row and the windward side There are two tube groups in the tube row, one less than the number of tube groups in the leeward side tube row, and a refrigerant inlet is provided at one end of the leeward side upper header portion. A refrigerant outlet is provided at the same end as the refrigerant inlet in the header section, and the nearest tube group closest to the refrigerant inlet in the leeward tube row and the farthest tube group farthest from the refrigerant inlet from the top of the refrigerant In addition to the downflow tube group flowing down, the intermediate tube group between the two downflow tube groups is the upflow tube group in which the refrigerant flows from the bottom to the top, and is located closest to the refrigerant outlet in the windward tube row. The tube group is the upflow tube group in which the refrigerant flows from the bottom to the top, and the farthest tube group farthest from the refrigerant outlet is the downflow tube group, and the windward side of the farthest tube group in the leeward tube row The farthest tube group of the windward tube row is arranged at the same time, and one path is constituted by both furthest tube groups, and the leeward tube row The upper end of the downflow tube group constituting the one path and the upflow tube group adjacent to the upstream side in the refrigerant flow direction of the downflow tube group are provided in the leeward upper header part and both ends are closed. An upper end portion of the downflow tube group that is communicated with one leeward section and constitutes the one path in the upwind tube row is provided in the upwind header section, and both ends are closed and more than the leeward section. An inflow portion in which the up-flow tube group is communicated with the upwind section and the refrigerant flows in from the heat exchange tube of the upflow tube group, and the downflow tube; The heat exchange tubes of the downflow tube group have an outflow portion through which the refrigerant flows out, and the outflow portion of the leeward section and the upwind section are communicated by the refrigerant passage section. A known evaporator is known (see Patent Document 1).

  However, in the evaporator described in Patent Document 1, in the leeward section of the leeward side upper header portion, when the refrigerant flowing into the inflow portion of the leeward section from the intermediate tube group of the leeward side tube row flows to the farthest tube group side. , Because it becomes easy to flow to the back side (downstream in the flow direction in the leeward section) due to inertia, after passing through the refrigerant passage part and entering the windward section, it becomes the total heat exchange tube of the farthest tube group in the windward tube row There is a tendency that the amount of refrigerant flowing into the total heat exchange tube of the farthest tube group in the leeward side tube row becomes larger than the amount of refrigerant flowing in. 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 Downstream tube groups constituting the one path in the windward tube row, wherein upper ends of adjacent upstream tube groups are connected to one leeward section provided in the leeward upper header section and closed at both ends. Is connected to one upwind section which is provided in the upwind header section and closed at both ends and shorter in the left-right direction than the downwind section. And an inflow portion through which refrigerant flows from the heat exchange tubes of the upflow tube group, and a heat exchange channel of the downflow tube group through which the downflow tube group is communicated. The evaporator has an outflow part through which refrigerant flows out, and the outflow part of the leeward section and the upwind section are communicated with each other,
The outflow portion of the leeward section is divided into two in the left-right direction by the dividing member provided in the intermediate portion in the left-right direction of the outflow portion, so that the first portion located on the inflow portion side, the inflow portion, Is provided with a second portion located on the opposite side, the inflow portion side end portion of the first portion is communicated with the outflow portion side end portion of the inflow portion, and the first portion is upwind sectioned by the first refrigerant passage portion. And the second part is communicated to the windward section by the second refrigerant passage part,
All the refrigerant flowing into the inflow portion of the leeward section from the upflow tube group enters the heat exchange tube of the downflow tube group from the first portion after entering the first portion of the outflow portion, and the first of the outflow portion. The refrigerant enters the windward section through the first refrigerant passage after entering the part, enters the heat exchange tube of the downflow tube group from the windward section, and the first part after entering the first part of the outflow part. Enters the windward section through the first refrigerant passage part, then enters the second part of the outflow part from the windward part through the second refrigerant passage part, and enters the heat exchange tube of the downflow tube group from the second part. The evaporator is designed to be separated from the incoming refrigerant.

  In the evaporator 1), the dividing member that divides the outflow portion of the leeward section in the left-right direction is provided not only in the center portion in the left-right direction of the outflow portion but also in an arbitrary position within the range of the outflow portion in the left-right direction.

  2) The area of the communication part that communicates with the inflow part in the outflow part of the leeward section is A, the area of the first refrigerant passage part that passes through the first part of the outflow part of the leeward section and the upwind section is Ad, and Of the total heat exchange tubes of the downflow tube group leading to the outflow portion, when the total passage cross-sectional area of the refrigerant passage of the heat exchange tube leading to the first portion is At, the above 1 satisfying the relationship of A <Ad + At, At <Ad Evaporator as described.

  3) The upper end of the total heat exchange tube of the downflow tube group communicating with the outflow portion of the leeward section is in the leeward section and the upper end of the total heat exchange tube of the downflow tube group communicating with the upwind section Is located in the windward section, and a partition is provided between the outflow part of the leeward section and the windward section over the entire length of the outflow part and the windward section, and the first refrigerant passage part and the second refrigerant passage part are Each of the through holes formed in the partitioning portion is configured such that the lower ends of the through holes constituting both the refrigerant passing portions are spaced above the bottom surfaces of the internal spaces of the leeward compartment and the windward compartment and constitute the one path The evaporator according to 1) or 2) above, which is at a height position below the upper end of the total heat exchange tubes of the two downflow tube groups.

  4) The lower ends of the through holes constituting both refrigerant passage portions are at the same height position, and the upper ends of the total heat exchange tubes of the two downflow tube groups constituting the one path are at the same height position. Evaporator as described.

  5) 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. Two tube groups are provided in the windward tube row, and the tube group on the opposite side to the refrigerant outlet is the downflow tube group. The evaporator according to any one of the above 1) to 4), which is a tube group, and one path is constituted by the farthest tube groups of both tube rows.

  According to the evaporators 1) to 5), the outflow portion of the leeward section is divided into two in the left-right direction by the dividing member provided in the middle portion in the left-right direction of the outflow portion. A first portion located on the side and a second portion located on the opposite side of the inflow portion, the inflow portion side end of the first portion is connected to the outflow portion side end of the inflow portion, One part is communicated to the windward section by the first refrigerant passage part, and the second part is communicated to the windward section by the second refrigerant passage part, and flows into the inflow part of the leeward section from the upflow tube group All of the refrigerant that has entered the first part of the outflow part and then enters the heat exchange tubes of the downflow tube group from the first part, and after entering the first part of the outflow part, passes through the first refrigerant passage part. To enter the windward section Refrigerant entering the heat exchange tube of the tube group, and after entering the first part of the outflow part, enters the windward section from the first part through the first refrigerant passage, and then passes through the second refrigerant from the windward section. Since the refrigerant enters the second part of the outflow part through the part and is separated from the second part into the refrigerant entering the heat exchange tube of the downflow tube group, the refrigerant that has flowed into the outflow part from the inflow part of the leeward section Among them, even if the amount of refrigerant flowing into the heat exchange tube of the downflow tube group communicating with the first portion of the outflow portion increases, the downflow tube group communicating with the second portion of the outflow portion of The amount of refrigerant flowing into the heat exchange tube is reduced. As a result, the amount of refrigerant flowing through the total heat exchange tube of the downflow tube group communicating with the outflow portion of the leeward section in the leeward side tube row, and the total amount of the downflow tube group communicating with the upwind section in the leeward side tube row. The amount of refrigerant flowing through the heat exchange tube can be made uniform, and the cooling performance of the evaporator becomes excellent.

  According to the evaporator of the above 2), the amount of refrigerant flowing through the heat exchange tube of the downflow tube group leading to the outflow portion of the leeward section in the leeward tube row, and the lowering leading to the upwind section in the leeward tube row It is possible to effectively equalize the amount of refrigerant flowing through the heat exchange tubes of the flow tube group.

  According to the evaporator of the above 3), the refrigerant that has flowed into the inflow portion from the upflow tube group that communicates with the inflow portion of the leeward section is in the downflow tube group that communicates with the first portion of the outflow portion of the leeward section. It is easier to flow into the windward section through the first refrigerant passage than in the heat exchange tube, and the amount of refrigerant flowing into the windward section through the first refrigerant passage is suppressed from being excessive. The Therefore, the amount of refrigerant flowing through the heat exchange tube of the downflow tube group that leads to the outflow portion of the leeward section in the leeward side tube row, and the heat exchange tube of the downflow tube group that leads to the upwind section in the leeward side tube row It is possible to effectively equalize the amount of refrigerant flowing through the.

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 a figure equivalent to FIG. 4 which shows the modification of a 2nd refrigerant | coolant passage part.

  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 second tube group (17) and the inflow portion (41) through which the refrigerant flows from the heat exchange tube (2) of the second tube group (17), and the third tube There is an outflow portion (42) through which the group (18) is passed and the refrigerant flows out to the heat exchange tube (2) of the third tube group (18). The outflow part (42) of the third section (24) is divided into two parts in the left-right direction by the dividing member (38) provided in the middle part in the left-right direction of the outflow part (42), thereby the outflow part (42 ) Located on the inflow portion (41) side (right side) and having a single internal space as a whole, located on the opposite side (left side) of the inflow portion (41) and A second portion (44) having a single internal space is provided. The end portion (right end portion) on the inflow portion (41) side of the first portion (43) is connected to the end portion (left end portion) on the outflow portion (42) side of the inflow portion (41).

  The first part (43) of the outflow part (42) of the third section (24) is communicated to the fifth section (29) by the first refrigerant passage part (33), and the second part (44) is also the second part. It is made to communicate with the 5th division (29) by the refrigerant passage part (34). Both refrigerant passage portions (33), (34) are arranged in a left-right direction into a partition portion (9a) that divides the inside of the upper tank (9) into a leeward upper header portion (5) and an leeward upper header portion (7). It consists of a plurality of through holes (37) formed at intervals. In addition, both refrigerant | coolant passage parts (33) (34) may be comprised by one through-hole. The lower ends of the through holes (37) constituting both the refrigerant passage portions (33) and (34) are spaced above the bottom surfaces of the internal spaces of the third compartment (24) and the fifth compartment (29), and The lower end of the through hole (37) is at the same height position. Moreover, the lower end of all the through-holes (37) exists in the height position below the upper end of the 3rd tube group (18) which is a downflow tube group which comprises one path | pass, and a 4th tube group (19). .

  Here, the opening area of the communication portion communicating with the inflow portion (41) in the outflow portion (42) of the third section (24) is A, and the first portion of the outflow portion (42) of the third section (24) ( 43) and the fifth compartment (29) through the first refrigerant passage portion (33) area (total area of all through holes (37) constituting the first refrigerant passage portion (33)) is Ad, the third compartment Total cross-sectional area of the refrigerant passage of the heat exchange tube (2) leading to the first part (43) out of the total heat exchange tube (2) of the third tube group (18) leading to the outflow part (42) of (24) When At is At, it is preferable that the relationship of A <Ad + At, At <Ad is satisfied.

  The portion of the fourth compartment (27) and the lower end of the heat exchange tube (2) of the fourth tube group (19) in the sixth compartment (32) communicates with the inside of the lower tank (11). It is made to communicate by the 3rd refrigerant | coolant passage part (35) provided in the partition part (11a) divided | segmented into a leeward side lower header part (6) and a windward side lower header part (8). The third refrigerant passage portion (35) includes a partition portion (11a) that divides the lower tank (11) into a leeward lower header portion (6) and a leeward lower header portion (8). It consists of one through hole (36) formed by removing over the entire length of 27). The through hole (36) is formed over the entire height and the entire length of the fourth section (27).

  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 third refrigerant passage portions (33), (34), and (35) are provided, so that the refrigerant is in the leeward side tube row ( The first tube group (16) which is the latest tube group of 3), the third tube group (18) which is the farthest tube group of the leeward tube row (3), and the farthest tube group of the windward tube row (4) In the fourth tube group (19), the heat exchange tubes (2) flow from top to 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. A second tube group (upstream tube group adjacent to the upstream side in the refrigerant flow direction of the third tube group (18)) is connected to the outflow portion (42) of the third section (24) which is one leeward section ( The upper end of 17) is connected to the inflow portion (41) of the third section (24), which is one leeward section provided at the leeward upper header section (5) and closed at both ends. In addition, the total heat exchange tube (2) of the third tube group (18) includes a heat exchange tube (2) leading to the first portion (43) of the outflow portion (42) and a heat exchange tube leading to the second portion. It is divided into (2). Further, the upper end portion of the fourth tube group (19), which is the downflow tube group in the windward tube row (4), is provided in the windward upper header portion (7) and both ends are closed and the third section is closed. The fifth section (29), which is one upwind section whose length in the left-right direction is shorter than (24), is communicated. 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 three paths as described below 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), Through the inflow part (41) of the third section (24), the first part (43) of the outflow part (42) of the third section (24), and the first part (43) of the third tube group (18) Heat exchange tube (2), fourth compartment (27), third refrigerant passage part (35), sixth compartment (32), heat exchange tube (2) and seventh compartment (5) of the fifth tube group (21) 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), The inflow part (41) of the third section (24), the first part (43) of the outflow part (42) of the third section (24), the first refrigerant passage part (33), the fifth section (29), These are the heat exchange tube (2), the sixth section (32), the heat exchange tube (2) and the seventh section (31) of the fifth tube group (21). The third 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 inflow part (41) of the third section (24), the first part (43) of the outflow part (42) of the third section (24), the first refrigerant passage part (33), the fifth section (29), 2 Heat exchange tubes (34) leading to the refrigerant passage section (34), the second portion (44) of the outflow portion (42) of the third section (24), and the second portion (44) of the third tube group (18) 2), the fourth section (27), the third refrigerant passage part (35), the sixth section (32), the heat exchange tube (2) of the fifth tube group (21), and the seventh section (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 three paths described above, 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, all the refrigerant that has flowed from the second tube group (17) into the inflow portion (41) of the third section (24) enters the first portion (43) of the outflow portion (42). The refrigerant that enters the heat exchange tube (2) of the third tube group (18) from the first part (43) after entering, and the first part (43) after entering the first part (43) of the outflow part (42). 43) enters the fourth section (29) through the first refrigerant passage section (33) and then into the heat exchange tube (2) of the fourth tube group (19) leading to the fourth section (29). The refrigerant entering the first section (43) of the outflow section (42) and then entering the fourth section (29) through the first refrigerant passage section (33), then the second refrigerant passage section (34) The refrigerant flows into the second part of the outflow part (42) and then into the refrigerant entering the heat exchange tube (2) of the third tube group (18), so that the inflow of the third section (24) Out of the refrigerant that flowed from the part (41) to the outflow part (42) Even if the amount of refrigerant flowing into the heat exchange tube (2) of the third tube group (18) leading to the first portion (43) of the minute (42) increases, The amount of refrigerant flowing into the heat exchange tube (2) of the third tube group (18) communicating with the two portions is reduced. 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.

  FIG. 7 shows a modification of the second refrigerant passage portion (34) that is passed through the second portion (44) of the outflow portion (42) of the third compartment (24) and the fifth compartment (29).

  The second refrigerant passage part (34) shown in FIG. 7 includes a partition part (9a) that divides the upper tank (9) into a leeward upper header part (5) and an leeward upper header part (7). It consists of one through hole (51) formed by removing over the entire length of the two parts (44). The through hole (51) is formed over the entire height and the entire length of the second portion (44).

  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): Partition
(16) (17) (18): First to third tube groups
(19) (21): Fourth and fifth tube groups
(24): 3rd section (leeward section closed at both ends)
(29): 5th section (windward section closed at both ends)
(33): First refrigerant passage
(34): Second refrigerant passage
(37) (51): Through hole

Claims (5)

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 Down flow tubes constituting the one path in the windward side tube row, the upper end portion of the upward flow tube group adjacent to each other being connected to one leeward section provided in the leeward upper header portion and closed at both ends. The upper end portion of the group is provided in the upwind header portion and both ends are closed and the length in the left-right direction is shorter than that of the leeward compartment. The inflow portion through which the refrigerant flows from the heat exchange tube of the upflow tube group and the downflow tube group and the heat exchange channel of the downflow tube group. Over Bed to have an outflow portion in which the refrigerant flows out, a evaporator outlet portion of the downwind section and the windward compartment is vented from each other,
The outflow portion of the leeward section is divided into two in the left-right direction by the dividing member provided in the intermediate portion in the left-right direction of the outflow portion, so that the first portion located on the inflow portion side, the inflow portion, Is provided with a second portion located on the opposite side, the inflow portion side end portion of the first portion is communicated with the outflow portion side end portion of the inflow portion, and the first portion is upwind sectioned by the first refrigerant passage portion. And the second part is communicated to the windward section by the second refrigerant passage part,
All the refrigerant flowing into the inflow portion of the leeward section from the upflow tube group enters the heat exchange tube of the downflow tube group from the first portion after entering the first portion of the outflow portion, and the first of the outflow portion. The refrigerant enters the windward section through the first refrigerant passage after entering the part, enters the heat exchange tube of the downflow tube group from the windward section, and the first part after entering the first part of the outflow part. Enters the windward section through the first refrigerant passage part, then enters the second part of the outflow part from the windward part through the second refrigerant passage part, and enters the heat exchange tube of the downflow tube group from the second part. The evaporator is designed to be separated from the incoming refrigerant. The area of the communication part that communicates with the inflow part in the outflow part of the leeward section is A, the area of the first refrigerant passage part that passes through the first part of the outflow part of the leeward section and the upwind section is Ad, and the outflow part of the leeward section 2. The relation of A <Ad + At, At <Ad is satisfied, where At is the total passage cross-sectional area of the refrigerant passage of the heat exchange tube leading to the first portion among the total heat exchange tubes of the downflow tube group leading to. The evaporator. The upper end of the total heat exchange tube of the downflow tube group leading to the outflow portion of the leeward section is in the leeward section, and the upper end of the total heat exchange tube of the downflow tube group leading to the upwind section is the wind A partition is provided over the entire length of the outflow part and the windward section between the outflow part of the leeward section and the windward section, and the first refrigerant passage part and the second refrigerant passage part are respectively divided by the partition. The lower ends of the through holes constituting both refrigerant passing portions are spaced above the bottom surfaces of the internal space of the leeward compartment and the windward compartment, and constitute one path 2 The evaporator according to claim 1 or 2, wherein the evaporator is located at a height position below the upper end of the total heat exchange tubes of the two downflow tube groups. The lower end of the through-hole which comprises both refrigerant | coolant passage parts is in the same height position, and the upper end of the total heat exchange tube of the two downward flow tube groups which comprise said one path | pass is in the same height position. The evaporator. 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 tube group on the opposite side to the refrigerant outlet is the downflow tube group The evaporator according to any one of claims 1 to 4, wherein one path is constituted by the farthest tube groups of both tube rows.

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