KR101134782B1 - Evaporator for an Air Conditioning System of a Car - Google Patents

Abstract

The present invention is a bypass tube group formed by the blank plate (Blank Plate) and the bypass hole is formed so as to communicate with each tube group between the 4-tank tube group and 2-tank tube group constituting each evaporation region By providing a, it is to provide an evaporator for a vehicle air conditioner to improve the temperature distribution uniformity of the heat exchanger discharge air and to reduce the pressure drop of the heat exchange medium.

To this end, the present invention, the inlet and outlet tubes through which the heat exchange medium is introduced / discharged; A four-tank type first and second tube groups each having a pair of heat exchange passages and upper and lower portions of the heat exchange passages; A bypass tube group interposed in the four-tank first and second tube groups to provide a flow path for bypassing the heat exchange medium; Blank tubes provided on both sides of the bypass tube group to change the flow path of the heat exchange medium, and has a blank for partitioning the evaporator into the first to 2-3 evaporation zone; And a heat dissipation fin interposed between the four tank type first and second tube groups and the bypass tubes to widen the heat dissipation area.

Evaporator, heat exchange medium, 4-tank tube, 2-tank tube, bypass, evaporation zone.

Description

Evaporator for an Air Conditioning System of a Car}

1 is a perspective view showing a general evaporator.

FIG. 2 shows a flow path of a heat exchange medium in an evaporator (E / V) according to a 2-tank type of the prior art, and FIG. 2a shows a heat exchange in an evaporator composed of three evaporation zones. 2 is a schematic diagram showing a flow path of a heat exchange medium in an evaporator composed of four evaporation zones.

Figure 3 is an exploded perspective view showing an evaporator made of a four-tank tube group according to a first embodiment of the present invention.

4 is a schematic diagram illustrating a flow state of the heat exchange medium of FIG. 3.

Figure 5 is a block diagram showing the flow state of the heat exchange medium of the evaporator made of a two-tank tube group according to a second embodiment of the present invention.

Figure 6 is a front view showing a plate applied to the two-tank tube according to an embodiment of the present invention.

Figure 7 is a front view showing a plate applied to the four-tank tube according to an embodiment of the present invention.

8 is a front view showing a plate applied to the bypass tube applied to the evaporator according to each embodiment of the present invention.

** Explanation of symbols for main parts of the drawing **

100, 200: evaporator,

104, 204: inlet pipe,

106, 206: discharge pipe,

TB1: 4-tank type first tube group,

TB2: 4-tank type second tube group,

TB1a: 2-tank type first tube group,

TB2a: 2-tank type second tube group,

BT: Bypass tube group, (BT),

120: blank tube having a four-tank blank,

210: blank tube having a two-tank blank,

130: heat radiation fins.

The present invention relates to an evaporator for a vehicle air conditioner, and more particularly, between a four-tank tube group and a two-tank tube group that are divided by blank tubes and constitute each evaporation region. Evaporator for a vehicle air conditioner provided with a bypass tube group having a bypass hole in communication with the tube group to improve the temperature distribution uniformity of the evaporator discharge air and to reduce the pressure drop of the heat exchange medium. It is about.

In general, a vehicle is provided with various heat exchangers, for example, a heater core for heating a vehicle, a radiator for cooling a vehicle engine, a condenser and an evaporator for cooling a vehicle, and an oil cooler for cooling oil for an automatic transmission. The evaporator constitutes a cooling cycle in which the heat exchange medium is circulated. The evaporator is mounted on a ventilation path formed through a case of an air conditioning apparatus, and heat exchange with a heat exchange medium circulating a cooling cycle in the air blown through the ventilation path is performed. Heat exchanger to achieve.

For example, as shown in FIG. 1, a general vehicle air conditioner evaporator E has a heat exchange medium flow path (not shown) formed therein, and hole cups 12 are disposed at upper and lower sides of the heat exchange medium flow path, respectively. A plurality of heat exchange plates (Plate) 10 formed therein; A blank plate 60 is formed at a predetermined position to which the heat exchange plates 10 are connected to define an evaporation region, and a heat exchange medium flow path is formed therein, and the heat exchange plates 10 and the blank plate 60. A plurality of heat dissipation fins 20 provided between the plurality of heat dissipation fins, a support 30 provided outside the heat exchange plate 10 and the heat dissipation fins 20, and a predetermined position of the support 30; Manifolds (40) that communicate with the heat exchange plates (10) and the blank plates (60) to form an inflow and outflow path of the heat exchange medium, and are coupled to the manifold (40) to inflow and outflow of the heat exchange medium. It consists of inlet and outlet pipes (50a, 50b) provided to be.

The evaporator (E) as described above is a 1-tank type, 1-tank type, 2-tank type, or 4-tank type (4) depending on the shape where the hole cup 12 is formed and joined. -Tank Type).

Here, the 1-tank type evaporator, the distribution of the heat exchange medium and the pressure drop of the heat exchange medium is increased to show a local superheat zone, for this reason, the problem of not meeting the recent light thinning trend there was.

Figure 2 shows the flow path of the heat exchange medium in the evaporator E according to the 2-tank type of the prior art, Figure 2a shows the heat exchange medium in the evaporator consisting of three evaporation zones Figure 2b is a schematic diagram showing the flow path, Figure 2b is a schematic diagram showing the flow path of the heat exchange medium in the evaporator consisting of four evaporation zones.

As shown in FIG. 2A and FIG. 2B, the evaporation region of the evaporator E is generally divided into three to four. Hereinafter, the evaporation process in the evaporator composed of four evaporation regions will be described.

That is, as shown in Fig. 2b, according to the evaporator partitioned into four evaporation zones by the blank plate, the heat exchange medium introduced through the inlet pipe 50a is partitioned by the blank plate 60 blocked on the lower side. In the first evaporation region, heat is exchanged with air while flowing from the lower side to the upper side along the flow path of the heat exchange medium formed in the hole cup 12 and the heat exchange plate 10. At this time, the heat exchange medium flowing above the first evaporation region enters the second evaporation region through the hole cup 62 of the blank plate 60 forming a tank (not shown), The heat exchange medium entering the secondary evaporation region E2 flows downward by the blank plate 60 blocked at the upper side thereof and enters the third evaporation region. As described above, the heat exchange medium entering the third evaporation zone flows upward by the blank plate 60 blocked at the lower side thereof, thereby entering the fourth evaporation zone, and entering the fourth evaporation zone. Is discharged through the outlet pipe 50b provided on the lower side.

However, according to the two-tank type evaporator E according to the related art as described above, as illustrated in FIGS. 2A and 2B, the introduced heat exchange medium has a one-way flow type. Method). In this case, the heat exchange is performed in each evaporation area around the blank plate 60, but since the amount of liquid heat exchange medium reaching the final evaporation area is small, the heat exchange medium superheat zone is mainly formed at the outlet side of the heat exchange medium.

As described above, when the heat exchange medium overheating zone occurs, the heat exchange medium may drift. The air discharge temperature is increased in the portion where the flow rate of the heat exchange medium is small so that the temperature deviation from the adjacent air increases. There was a problem.

That is, due to the drift of the heat exchange medium, there is a problem that the superheated region exists on the outlet side through which the heat exchange medium flows out, and the temperature of the air passing through the evaporation region on the outlet side increases.

On the other hand, the four-tank evaporator, although the superheat zone that may occur in the one-tank and two-tank evaporators can be removed by heat exchange from the rear side before heat exchange with the outlet heat exchange medium, As the media are communicated to one side, the distribution of the heat exchange medium becomes nonuniform, which locally has a higher temperature than the other portion, and the pressure drop on the heat exchange medium side increases.

The present invention has been made to solve the above problems, each tube between the four-tank tube group and the two-tank tube group that is divided by the blank tubes (Blank Tubes) to constitute each evaporation region. By providing a bypass tube group having a bypass hole in communication with the group, the evaporator for the vehicle air conditioner which improves the temperature distribution uniformity of the evaporator discharge air and reduces the pressure drop of the heat exchange medium. The purpose is to provide.

In order to solve the above technical problem, an evaporator for a vehicle air conditioner according to a first embodiment of the present invention, an inlet pipe and a discharge pipe to which the heat exchange medium is introduced / discharged; A four-tank type first and second tube groups each having a pair of heat exchange passages and upper and lower portions of the heat exchange passages; A bypass tube group interposed in the four-tank first and second tube groups to provide a flow path for bypassing the heat exchange medium; Blank tubes provided on both sides of the bypass tube group to change the flow path of the heat exchange medium, and has a blank for partitioning the evaporator into the first to 2-3 evaporation zone; And a heat dissipation fin interposed between the four tank type first and second tube groups and the bypass tubes to widen the heat dissipation area.

An evaporator for a vehicle air conditioner according to a second embodiment of the present invention includes an inlet tube and an outlet tube through which a heat exchange medium is introduced / exhausted; A two-tank type first and second tube groups each having tank portions formed at upper and lower portions of the heat exchange passage; A bypass tube group interposed between the two-tank first and second tube groups to provide a flow path for bypassing the heat exchange medium; A blank tube provided between the two-tank first and second tube groups to change a flow path of the heat exchange medium and partition the evaporator into first and second evaporation zones; And a heat dissipation fin interposed between the two-tank first and second tube groups and the bypass tubes to widen the heat dissipation area.

Tubes of the bypass tube group interposed between the four-tank tube group and the two-tank tube group of the evaporator for a vehicle air conditioner according to the first and second embodiments of the present invention, the first tank portion and the second tank Each tank unit is installed, and the second tank unit located at a predetermined position on one side is characterized in that a communication hole communicating with these flow passages is formed so as to bypass the heat exchange medium.

One of the tubes of the bypass tube group interposed between the four-tank first and the second tube group of the evaporator for vehicle air conditioner according to the first embodiment of the present invention is provided with a partition means flow path of the heat exchange medium It characterized in that to switch.

Hereinafter, each embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

  Figure 3 is an exploded perspective view showing an evaporator made of a four-tank tube group according to a first embodiment of the present invention, Figure 4 is a schematic configuration diagram showing a flow state of the heat exchange medium of FIG.

As shown in Figure 3 and 4, according to the evaporator 100 for a vehicle air conditioner according to a first embodiment of the present invention, the inlet tube 104 and the discharge tube 106, the heat exchange medium is introduced / discharged; A four-tank type first and second tube groups TB1 and TB2 each having a pair of heat exchange passages and tank portions formed on upper and lower portions of the heat exchange passages; A bypass tube group BT interposed between the four-tank first and second tube groups TB1 and TB2 to provide a flow path for bypassing the heat exchange medium; A blank tube (120) provided at both sides of the bypass tube group (BT) to change a flow path of the heat exchange medium and to divide the evaporator into first evaporation zones (E1, E2, E3); And a heat dissipation fin 130 interposed between the tubes of the 4-tank tube group TB1 and TB2 and the bypass tube group BT to widen the heat dissipation area.

Here, an end plate 102 is provided at an outermost side of the 4-tank tube group TB1 and TB2, and a heat exchange medium is provided at the front side of the end plate 102 by the tube group 110a. An inlet tube 104 and an outlet tube 106 are provided to provide a passage through which the inlet / outlet is connected. The inlet tube 104 and outlet tube 106 may be disposed on the front or side of the evaporator 100 depending on the design.

In addition, the four-tank first and second tube group (TB1, TB2) is the first tube 140 made of a first plate 141, and the second plate 142 is installed adjacent to each other and coupled thereto Plural numbers are stacked. The first tube 140 is provided with a tank portion 143 in the upper and lower portions. The tank unit 143 is composed of first and second tube groups (TB1, TB2) are installed in each of the front and rear separate columns in the upper and lower parts of the tube 140.

In addition, ribs 144 are formed in the first and second plates 141 and 142 in a longitudinal direction at a central portion thereof. The rib 144 divides the flow space of the heat exchange medium into front and rear rows.

Accordingly, the first tank portion 143a and the fourth tank portion 143d are disposed up and down from an equivalent flow space of the heat transfer surface of the first tube 140, and the second tank portion 143b and the first tank portion 143a and the fourth tank portion 143d. The three tank portions 143c are arranged up and down from the equivalent flow space of the rear heat face partitioned by the rib 144. The first tank portion 143a to the fourth tank portion 143d are coupled to communicate with each other when the adjacent tube 140 is coupled to each other.

On the other hand, beads 140a are formed on opposite surfaces of the first and second plates 141 and 142 constituting the first tube 140 to promote turbulence of the heat exchange medium.

In addition, the blank tube 120 having a blank installed adjacent to the four-tank tube group TB1 (TB2) to partition the evaporation zone (E1, E2, E3) to switch the flow path of the heat exchange medium. It is installed, which can be installed if the flow path of the heat exchange medium is required. The blank tube 120 is composed of first and second plates 121 and 122. The blank tube 120 is provided with a tank portion 123 in the upper and lower portions. The tank part 123 may be formed of a four-tank blank type by consisting of first to fourth tank parts 123a, 123b, 123c, and 123d installed in front and rear rows on upper and lower parts of the blank tube 120. have.

At this time, the first tank portion 123a and the second tank portion 123b disposed in the front and rear rows on the blank tube 120 block the passage through which the heat exchange medium flows in order to switch the flow path of the heat exchange medium. It is blank type. On the other hand, the third tank portion 123c and the fourth tank portion 123d disposed in the front and rear rows at the bottom of the blank tube 120 provide a flow path of the heat exchange medium.

In addition, the blank tube 120 has ribs 124 formed on the first and second plates 121 and 122 in order to partition the flow space of the heat exchange medium in the front and rear rows in the center portion thereof. A plurality of beads 120a are formed on opposite surfaces of the 121 and 122.

In addition, a plurality of second tubes 150 are provided in the bypass tube group BT which is provided between the 4-tank first and second tube groups TB1 and TB2 to provide a flow path for bypassing the heat exchange medium. It is laminated and interposed. Like the first tube 140, the second tube 150 is coupled to the first plate 151 and the second plate 152, and the tank portion 153 is provided at the upper and lower portions thereof. Of course, the bypass tube group BT having the bypass flow path may appropriately change the position or the number of passes to improve the uniformity of the temperature distribution of the discharged air even if the distribution of air volume is uneven.

At this time, the tank portion 153 is a two-tank type in which a first tank portion 153a is provided at an upper portion of the second tube 153 and a second tank portion 153b is disposed at a lower portion thereof. . The first tank portion 153a includes a plurality of first communication holes 154a to be coupled to the first tank portion 123a and the second tank portion 123b of the blank tube 120 having an adjacent 4-tank blank. ) And a second communication hole 154b are formed, and the first and second communication holes 154a and 154b can communicate with each other.

The second tank portion 153b includes a third communication hole 154c communicating with the third tank portion 143c of the four-tank first and second tube groups TB1 and TB2, and a fourth portion. Fourth communication holes 154d communicating with the tank 143d are formed, respectively.

In this case, the third communication hole 154c serves as a bypass passage through which the heat exchange medium flowing from the first tube group TB1 is directly supplied to the second tube group TB2.

In addition, the first plate 151 and the second plate 152 of the bypass tube group BT have a central portion, unlike the aforementioned 4-tank first and second tube groups TB1 and TB2). The ribs for dividing the flow space of the heat exchange medium by front and rear rows are omitted.

Accordingly, the heat exchange medium flowing into the first tank portion 153a of the bypass tube group BT can flow to the second tank portion 153b without distinguishing the flow path in the front and rear heat. On the other hand, a plurality of beads 155 are formed on the opposing surfaces of the first and second plates 151 and 152.

In addition, a predetermined bypass between the bypass tube group BT is provided with a blank bypass tube 150b having partition means 155 for switching the flow path of the heat exchange medium.

Referring to the flow of the heat exchange medium of the evaporator 100 for a vehicle air conditioner according to the first embodiment of the present invention having the above structure as follows.

First, the heat exchange medium introduced through the inlet pipe 104 is supplied through the first tank part 143a located above the first tube group TB1 having a four-tank type, and partitioned by the rib 144. Heat is exchanged with the outside air while flowing along the heat transfer surface of the first evaporation region E1 of the tube 140. Subsequently, since the passage of the second tank portion 123b of the blank tube 120 having the 4-tank blank is blocked, the heat exchange medium flows to the lower end to bypass the tube group BT through the third tank portion 123c. ) Is switched to the flow path of the heat exchange medium to the second evaporation region (E2).

As such, the first tube group TB1 having a 4-tank type is stacked in the vicinity of the inlet tube 104 and the outlet tube 106 into which the heat exchange medium is introduced, so that when the heat exchange medium is initially introduced, In addition, the air temperature distribution can be improved by arranging the heat exchange medium in a gas phase before the heat exchange medium is finally discharged on the flow path.

Subsequently, the heat exchange medium supplied to the third tank part 143c of the first tube group TB1 is a second tank part located under the bypass tube 150 having a bypass in the second evaporation area E2. Bypassed through the fourth communication hole 154d of 153b, it is directly supplied to the second tube group TB2 having a 4-tank type.

As such, the second evaporation region E2 is a section in which the heat exchange medium is bypassed to one side of the evaporator heat transfer in order to uniformly supply the heat exchange medium of the liquid phase initially introduced into the evaporator 100 to the evaporator after heat. By adopting the bypass tube 150 having a bypass, the bypass tube serves as a bypass passage in the heat transfer of the evaporator 100, and simultaneously performs a heat dissipation function as a four-tank tube in the heat transfer after the evaporator 100. Will be said.

Next, the heat exchange medium flowing into the third tank portion 143c positioned under the second tube group TB2 of the third evaporation region E3 flows from the lower portion of the tube 140 to the upper portion to exchange heat with the outside air. Done. In this way, the heat exchange medium flowing to the first tank portion 143a positioned above the tube 140 for the second tube group TB2 is moved downward by the gravity of the heat exchange medium to the fourth tank portion 143d. As a result, the heat exchange is performed while flowing to the fourth communication hole 154d located below the tube 150 of the second evaporation region E2.

At this time, by the partition means 155 provided at a predetermined position of the second evaporation region E2 provided with the bypass tube group TB, the flow path is changed from the bottom to the top again. One heat exchange medium flows into the first evaporation area E1 through the fourth tank part 123d positioned below the blank tube 120.

In this process, the heat exchange medium flowing into the fourth tank portion 143d of the 4-tank first tube group TB1 flows from the lower portion of the first tube group TB1 to the upper portion, thereby exchanging heat with outside air. This is supplied to the first tank portion 143a. The heat exchange medium supplied to the first tank part 143a is discharged through the discharge pipe 106.

As such, the heat exchange medium introduced through the inlet pipe 104 is the first tube group TB1 having a four-tank type TB1 → the blank tube 120 having the blank → the bypass tube group BT having the bypass → blank Blank tube 120 having a four-tank-type second tube group (TB2) having a flow inside the heat exchange with the outside while being discharged to the discharge pipe 106.

(Second embodiment)

Figure 5 is a block diagram showing the flow state of the heat exchange medium of the evaporator made of a two-tank tube group according to a second embodiment of the present invention.

As shown, according to the evaporator 200 for a vehicle air conditioner according to a second embodiment of the present invention, the inlet pipe 204 and the discharge pipe 206 through which the heat exchange medium is introduced / discharged; Two-tank type first and second tube groups TB1a and TB2a each having tank portions formed at upper and lower portions of the heat exchange passage; A bypass tube group BT interposed between the two-tank first and second tube groups TB1a and TB2a to provide a flow path for bypassing the heat exchange medium; The blank which is provided between the two-tank type first and second tube groups TB1a and TB2a to switch the flow path of the heat exchange medium and partitions the evaporator into the first and second evaporation regions E1, E2 and E3. A blank tube 210 having a; And a heat dissipation fin (not shown) interposed between the two-tank type first and second tube groups TB1a and TB2a and the bypass tube group BT to widen the heat dissipation area.

In the evaporator 200, an inlet pipe 204 through which a heat exchange medium is introduced is disposed in front of the first evaporation area E1 in which the two-tank tube group TB1a is disposed. In the heat exchange medium introduced into the first evaporation region E1, the flow path of the heat exchange medium is switched from the upper side to the lower side by the blank tube 210 in which the upper flow path is blocked, so that the bypass tube group BT is disposed. Inflow to the second evaporation region (E2). Of course, the blank tube 210 may be formed to have a two-tank blank.

In this way, the heat exchange medium flowing into the heat transfer surface of the second evaporation region E2 is bypassed to flow to the third evaporation region E3 consisting of the two-tank type second tube group TB2a. At this time, the heat exchange medium heat-exchanged in the third evaporation region (E3) in which the two-tank tube is stacked is discharged to the discharge pipe (206) via the second evaporation region (E2) having the bypass tube group (BT). Done.

As such, the evaporator 200 is a two-tank type first tube group TB1a into which the heat exchange medium is introduced, and a heat exchange medium introduced into the first tube group TB1a into the two-tank type second tube group TB2a. Evaporation areas E1, E2, and E3 interposed between the bypass tube group BT for bypassing the exhaust gas through the bypass tube group BT and the two-tank type 1? 2 (TB1a, TB2a) and the bypass tube group BT. A blank tube 210 for partitioning is configured in combination. As a result, the liquid phase heat exchange medium can be evaporated intensively in the local superheated region.

6 is a front view showing a plate applied to the two-tank tube according to an embodiment of the present invention, Figure 7 shows a plate applied to the four-tank tube according to an embodiment of the present invention. 8 is a front view illustrating a plate applied to a bypass tube applied to an evaporator according to each embodiment of the present invention.

6 to 8, the two-tank tube plate 70 is provided with a first tank 71 and a second tank 72 up and down. The first and second communication holes 73 and 74 are formed in the first tank 71 so as to communicate with each other, and the third and fourth communication holes 75 are also formed in the second tank 72. 76 is formed to communicate with each other.

In addition, ribs for partitioning the flow space of the heat exchange medium into front and rear rows are omitted in the center portion of the plate 70, and beads 77 are formed to promote turbulence of the heat exchange medium.

The four-tank tube plate 80 is formed with a first to fourth tank group 81 to 84 are installed in the front and rear rows in the upper and lower portions, respectively. The first and third tank portions 81 and 83 are disposed up and down from an equal flow space of the heat transfer surface of the plate 80, and the second and fourth tank portions 82 and 84 are ribs ( It is arranged up and down from the equivalent flow space of the rear surface partitioned by 85).

The bypass tube plate 90 is provided with first and second tank portions 91 and 92 at upper and lower portions thereof. A plurality of first and second communication holes 93 and 94 are formed in the first tank 91, and they can communicate with each other. A third communication hole 95 and a fourth communication hole 96 are formed in the second tank part 92, respectively. In this case, the fourth communication hole 96 serves as a bypass passage. Unlike the other communication holes 93 to 95, the fourth communication hole 96 is not substantially in communication with the inside of the plate 90.

In addition, ribs for partitioning the flow space of the heat exchange medium from side to side in the center portion of the plate 90 are omitted. Accordingly, the heat exchange medium flowing into the first and second communication holes 93 and 94 of the first tank part 91 is the third of the second tank part 92 without distinguishing the flow path in front and rear heat. It is possible to flow to the communication hole (95).

While the exemplary embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to the specific embodiments, and those skilled in the art are appropriate within the scope described in the claims of the present invention. It will be possible to change.

As described above, according to the evaporator for a vehicle air conditioner according to the present invention, a space between a four-tank tube group and a two-tank tube group that is partitioned by blank plates and constitutes each evaporation region. Evaporator for a vehicle air conditioner provided with a bypass tube group having a bypass hole in communication with the tube group to improve the temperature distribution uniformity of the evaporator discharge air and to reduce the pressure drop of the heat exchange medium. There is an effect that can provide.

Claims (4)

An inlet tube 104 and an outlet tube 106 into which the heat exchange medium is introduced / exhausted; A pair of 4-tank type first tube groups in which upper and lower heat transfer pairs are formed respectively, and the upper tank portion and the lower tank portion communicate with each other by a pair of independent front and rear heat exchange passages; (TB1) The upper side is formed with one upper tank portion communicating heat and back heat, and the lower side is formed with a pair of lower tank parts with independent heat transfer and rear heat, and the upper and lower heat transfer paths are each separated by a pair of heat exchange paths. A second group of four tanks TB2 communicating with each other; The upper tank portion 153a is disposed in the middle of the four-tank first and second tube groups TB1 and TB2 and bypasses the heat exchange medium, and the heat transfer and the after heat are communicated with each other. And a lower tank portion 153d formed at a lower rear row and communicating with the upper tank portion 153a, and a lower tube portion having a lower tank portion 153d configured independently of the lower tank portion 153d to bypass the heat exchange medium. A bypass tube group BT having a bypass tank portion 154c connecting the group to the lower tank portion 143c of the second tube group;  Blanks 123a and 123b which are provided at both sides of the bypass tube group, respectively, and are blocked by the upper heat transfer and the rear heat so as to change the flow path of the heat exchange medium, are formed in the evaporator. A pair of blank tubes 120 partitioning into E2, E3; And a heat dissipation fin 130 interposed between the first and second tube groups and the bypass tubes to widen the heat dissipation area. Any one of the tubes constituting the bypass tube group is formed with a blank 155, the lower rear row is blocked so that the rear row side flow path is changed to act as a partition means, The inlet pipe and the discharge pipe are respectively connected to the upper tank heat transfer and the rear heat of the first tube group, the heat exchange medium introduced through the inlet pipe is the upper heat transfer tank unit and the lower heat transfer tank unit of the first tube group, A pass tank part, a lower heat transfer tank part and an upper tank part and a lower after-heat tank part of the second tube group, a lower after-heat tank part and an upper tank part and a lower after-heat tank part of the second tube group side of the bypass tube group; The evaporator for a vehicle air conditioner of claim 1, wherein the evaporator is discharged through the discharge pipe after flowing through the lower post-heat tank part and the upper post-heat tank part of the first tube group. An inlet pipe 204 and an outlet pipe 206 through which the heat exchange medium is introduced / exhausted; A two-tank type first and second tube groups TB1a and TB2a each having an upper tank portion and a lower tank portion in which heat transfer and back heat communicate with upper and lower portions of the heat exchange passage; Interposed between the two-tank type first and second tube groups TB1a and TB2a, an upper tank portion in which heat transfer and back heat are communicated is formed at an upper portion of the heat exchange passage, and a lower tank portion is formed in the lower heat transfer, A bypass tube group (BT) having a bypass tank portion (96) configured to communicate between the first tube group and the lower tank portion of the second tube group to bypass the heat exchange medium; It is provided between the two-tank first and second tube group is configured to switch the flow path of the heat exchange medium, and is located between the first tube group and the bypass tube group, the upper heat transfer and after heat transfer and the lower heat transfer A second blank tube having a blank in which a lower heat transfer is blocked between the first blank tube 210 and the bypass tube group and the second tube group; And a heat dissipation fin interposed between the two-tank type first and second tube groups and the bypass tubes to widen the heat dissipation area. The inlet pipe and the outlet pipe are connected to the upper tank portion of the first tube group and the lower tank portion of the bypass tube group, respectively, and the heat exchange medium introduced through the inlet pipe is connected to the upper tank portion of the first tube group. Characterized in that the lower tank portion, the bypass tank portion, the lower tank portion and the upper tank portion of the second tube group, flows through the upper tank portion and the lower tank portion of the bypass tube group and then discharges through the discharge pipe. Evaporator for vehicle air conditioning equipment. delete delete

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