JP5499834B2 - Evaporator - Google Patents

Description

  The present invention relates to an evaporator that is a component of a refrigeration cycle apparatus.

  For example, the conventional evaporator described in Patent Document 1 includes a core portion (heat exchange portion) having two tube rows in the air flow direction in which a large number of tubes extending in the vertical direction are stacked in the horizontal direction. Yes. An upper tank portion and a lower tank portion are provided above and below each tube row group, and partition plates are provided inside the upper tank portion and the lower tank portion, respectively. Further, the evaporator is provided with a diversion communication path that connects the leeward lower tank part and the leeward lower tank part farthest from the refrigerant inlet at one end of the upper tank part.

  In this conventional evaporator, the refrigerant that has flowed into the tube array on the leeward side from the refrigerant inlet flows in a U-turn through the tube array on the leeward side and the lower tank, and then the leeward side furthest from the refrigerant inlet. The refrigerant flow is divided into a refrigerant flow flowing upward in the tube row group from the lower tank portion and a refrigerant flow flowing in the lower tank portion on the windward side. Then, the divided flow merges in the upper tank section on the windward side, flows into the tube array group on the windward side, flows in a U-turn in the tube array group on the windward side, and the upper and lower tank sections, and is arranged in parallel with the refrigerant inlet. It flows out from the refrigerant outlet. The refrigerant evaporates by exchanging heat with the air flowing outside the tube when flowing in the tube.

Japanese Patent No. 4012989

  As in the prior art, in the evaporator having the entire path portion where the tube array group on the windward side and the tube array group on the leeward side are connected at a portion farthest from the refrigerant inlet, the temperature of the air blown from the core portion is uniform. In order to achieve the distribution, it is preferable to reduce either the windward side or the leeward side of the width of the tube row group constituting the entire path portion (the width of the tube row group in which the refrigerant flows in the same direction). .

  In the conventional evaporator, when the refrigerant that has flowed into the tank portion of the all-pass portion from the tube row group adjacent to the entire path portion flows through the tube row group constituting the all-pass portion, the adjacent tube is moved by the action of inertial force. It tends to flow more toward the part away from the row group, and tends to be less likely to flow at the part near the tube row group adjacent to the entire path portion. For this reason, in the tube row group of all the path portions, the air blowing temperature is higher in the portion closer to the adjacent tube row group than in the portion separated from the adjacent tube row group. Therefore, the temperature distribution of the blown air is not uniform, and the blown air having a good temperature distribution cannot be provided. Therefore, if the width of the tube row group constituting the entire path portion is reduced, the deviation of the refrigerant flow due to the influence of the inertial force can be reduced, so that the temperature distribution of the blown air can be brought close to a uniform state. .

  On the other hand, when the width of the tube row group constituting the entire path portion is reduced, the cross-sectional area of the communication path connecting the windward tank portion and the leeward tank portion is reduced. For this reason, there exists a problem that the pressure loss of the refrigerant | coolant flow in an evaporator becomes large.

  Accordingly, the present invention has been made in view of the above points, and an object of the present invention is to reduce the pressure loss of the refrigerant flow and to form an excellent temperature distribution of the air blown from the core portion. Is to provide.

The present invention employs the following technical means to achieve the above object. That is, the invention relating to the evaporator according to claim 1 is a single flow path row group composed of a plurality of passages formed by arranging a plurality of tubes (20a) extending in the vertical direction in the horizontal direction and through which the refrigerant flows. Are arranged side by side on the downstream side of the air to be heat-exchanged with the refrigerant, and a plurality of leeward flow channel groups (21) and a plurality of tubes (20b) extending in the vertical direction are arranged in the horizontal direction, and the refrigerant is contained therein. A core portion having a plurality of windward flow channel groups (22) configured such that a single flow channel group composed of a plurality of passages is arranged upstream of the leeward flow channel group (21). (100) and a leeward upper tank (31) connected to the upper end of the leeward flow channel group (21) and a leeward lower tank (41) connected to the lower end of the leeward flow channel group (21) And a plurality of tubes (2 in the leeward flow path row group (21) a) The leeward header tank (11) formed to distribute and collect the refrigerant in the leeward upper tank (32) connected to the upper end of the windward flow path group (22) and the windward flow The windward lower tank (42) connected to the lower end of the path row group (22) is formed so as to distribute and collect the refrigerant in the plurality of tubes (20b) of the windward flow path row group (22). And a refrigerant inlet portion provided on one side in the lateral direction so as to communicate with the inside of the leeward header tank (11) in order to introduce the refrigerant into the leeward flow path row group (21). (51) and a refrigerant outlet portion (52) provided on one side in the lateral direction so as to communicate with the inside of the windward header tank (12) in order to introduce the refrigerant into the windward flow path row group (22), Refrigerant flow rises in the leeward flow path row group (21) The leeward header tank (11) is partitioned and raised so that the ascending channel row group (21a, 210) and the descending channel row group (21b) where the refrigerant flow becomes a downward flow are formed adjacent to each other. The leeward partition walls (31a, 41a) for reversing the flow and the downflow, and the ascending channel row group (22a, 220) in which the refrigerant flow becomes an upward flow in the upwind channel row group (22) and the refrigerant flow descending A windward partition wall (32a, 42a) for partitioning the inside of the windward header tank (12) so as to be adjacent to the descending flow path row group (22b) to be a flow, and reversing the upward flow and the downward flow; With
The leeward side flow channel group (210) located farthest from the refrigerant inlet portion (51) and the windward flow channel row group (220) located farthest from the refrigerant outlet portion (52) have a lateral length. but it varies, and a flow path array group which the refrigerant flows in the same direction,
A communication passage provided on the other side in the horizontal direction with respect to one side in the horizontal direction in which the refrigerant inlet portion (51) and the refrigerant outlet portion (52) are provided, and is located at a portion farthest from the refrigerant inlet portion (51). Connected to the inside of the leeward side header tanks (411, 311) connected to the leeward side channel group (210) and to the windward side channel group (220) located farthest from the refrigerant outlet (52). A first communication passage (43, 33) communicating with the inside of the windward header tank (421, 321)
Further, the leeward or leeward header to which the flow path group (220, 210) having a longer lateral length is connected at a part farthest from the refrigerant inlet part (51) or the refrigerant outlet part (52). The inside of the tank (421, 411) is connected to the channel row group (21b, 22b) located next to the channel row group (210, 220) having a shorter lateral length in the lateral direction. A second communication passage (44, 34) communicating with the inside of the header tank (411, 421) on the leeward or leeward side,
The refrigerant that has flowed into the leeward header tank (411, 311) to which the second communication path (44, 34) is connected flows through the first communication path (43, 33) and the second communication path. (44, 34) is divided into a flow passing through (44, 34) and flows into the windward header tanks (421, 321), respectively.

  In the above-described conventional evaporator, when the lateral length of all the path sections where the windward flow path group and the leeward flow path group are connected is reduced, the blown air from the core is kept at a uniform temperature. Although it can be made close to the distribution, the cross-sectional area of the communication path connecting the leeward header tank and the leeward header tank is reduced. For this reason, the pressure loss of the refrigerant flow in the evaporator increases, which is not preferable from the viewpoint of the cooling performance and efficiency of the evaporator. Therefore, according to the present invention, the tank portion connected to the channel row group having the longer lateral length in the windward or leeward flow channel row group of the farthest portion, and the lateral length In order to further connect the tank part connected to the flow path line group located on the upstream side of the refrigerant flow with respect to the shorter flow path line group with the second communication path, the windward header tank and the leeward side of the farthest part Not only the header tank communicates with the first communication passage, but also the passage cross-sectional area can be further expanded by the second communication passage. Thereby, the pressure loss at the time of passage through the communication path when the refrigerant flows from the leeward header tank to the leeward header tank can be reduced, and the lateral length of all the path portions can be suppressed. Therefore, an evaporator that achieves both a reduction in the pressure loss of the refrigerant flow and the formation of a good temperature distribution of the air blown from the core portion can be obtained.

  The invention according to claim 2 is the inside of the leeward header tank (411) to which the second communication passage (44) is connected, according to claim 1, wherein the refrigerant is introduced into the second communication passage (44). A throttle part (41b) that restricts the passage cross-sectional area of the refrigerant is provided at a portion where the remaining refrigerant flows toward the first communication path (43) after a part of the refrigerant flows.

  In the evaporator, when the refrigerant that has flowed into the tank of the entire path portion from the flow path row group adjacent to the entire path portion further flows from the tank of the entire path portion to the flow path row group constituting the entire path portion, Due to the action of inertial force, it tends to flow more towards the part away from the adjacent flow path group, and less likely to flow to the part near the flow path group adjacent to the entire path part. For this reason, the flow path row group of all the path portions is biased in the flow rate distribution of the refrigerant in the lateral direction, and the air passing through a part away from the adjacent flow path row group is more easily cooled. Therefore, according to the present invention, by providing the throttle portion, the throttle portion serves as a flow resistance of the refrigerant flowing to the first communication path side, so that the amount of refrigerant flowing through the passage configured by the throttle portion is reduced. It is suppressed, and the tendency of the refrigerant to easily flow to a site away from the adjacent flow path row group by the action of inertial force can be improved. Therefore, it is possible to further promote the formation of a good temperature distribution of the air blown from the core portion.

  According to a third aspect of the present invention, in the first aspect, the throttle part (31b) for narrowing the passage cross-sectional area inside the leeward header tank (311) to which the second communication passage (34) is connected is provided in the lateral direction. It is provided between the second communication path (34) and the first communication path (33).

  In the evaporator, as described above, when the refrigerant that has flowed into the tanks of all the path portions flows into the flow path row group that constitutes all the path portions, a large amount of the refrigerant moves toward the other side end portion in the lateral direction by the action of inertia. It is easy to flow, and the flow path row group in all the path portions is biased in the refrigerant flow distribution in the lateral direction. Therefore, according to the present invention, since the throttle portion serves as a flow resistance of the refrigerant flowing toward the first communication path side, the refrigerant distribution flowing through the flow path row group of all the path portions is in a state of reducing the bias due to inertial force. Can be improved. Therefore, it is possible to further promote the formation of a good temperature distribution of the air blown from the core portion.

  A fourth aspect of the present invention is characterized in that, in the second or third aspect, the throttle portion is constituted by a partition wall (41b, 31b) in which a through hole is formed. According to this invention, the said diaphragm | throttle which becomes distribution | circulation resistance can be comprised by providing the partition wall provided with the through-hole of a suitable magnitude | size inside a tank. Therefore, an evaporator capable of forming blown air having a good temperature distribution can be obtained without complicating the configuration.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the windward side flow path group (220) located at a position farthest from the refrigerant outlet portion (52) includes the refrigerant inlet portion ( 51) is a channel row group having a longer lateral length than the leeward channel column group (210) located farthest from 51),
The second communication passage (44) includes an inside of the windward header tank (421) to which the windward flow path row group (220) in the farthest part of the longer lateral length is connected, and the lateral direction Of the leeward header tank (411) to which the channel row group (21b) located next to the leeward side channel row group (210) in the farthest part of the shorter length is connected in the lateral direction. It is characterized by communicating with the inside.

  According to this invention, the evaporator which has the whole path | pass part which shortened the horizontal direction length of the leeward side flow path sequence group with respect to the windward flow path sequence group is obtained. Thereby, the evaporator which improves the bias | inclination of the temperature distribution of the blowing air in a leeward side flow path row group can be provided, suppressing the pressure loss in a windward flow path row group.

According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the leeward side flow channel group (210) located at a position farthest from the refrigerant inlet portion (51) is provided with a refrigerant outlet portion ( 52) is a channel row group having a longer lateral length than the windward channel row group (220) in the part farthest from
The second communication path (34) includes an inside of the leeward header tank (311) to which the leeward flow path row group (210) in the farthest part of the longer lateral length is connected, and the lateral direction Of the windward header tank (321) to which the channel row group (22b) located next to the windward channel row group (220) in the farthest part of the shorter length is connected in the lateral direction It is characterized by communicating with the inside.

  According to the present invention, an evaporator having an entire path portion in which the lateral length of the windward flow channel group is shortened with respect to the leeward flow channel group can be obtained. Thereby, the evaporator which improves the bias | inclination of the temperature distribution of the blowing air in a windward channel group can be provided, suppressing the pressure loss in a leeward channel group.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the second communication path (44) includes the inside of the leeward lower tank (411) and the leeward lower tank (421). It is the lower side communicating path which connects with the inside of.

  According to an eighth aspect of the present invention, in any one of the first to sixth aspects, the second communication path (34) includes the inside of the leeward upper tank (311) and the upper windward tank (321). It is the upper side communicating path which connects with the inside.

  In addition, the code | symbol in the parenthesis attached | subjected in each said claim and each claim of a claim is an example which shows a corresponding relationship with the specific means of embodiment description later mentioned.

It is a perspective view showing the appearance of the evaporator to which the present invention is applied. It is the perspective view which expanded and illustrated a part of core part of an evaporator. It is the schematic diagram which showed schematic structure and refrigerant | coolant flow of the evaporator which concerns on 1st Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 2nd Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 3rd Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 4th Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 5th Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 6th Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 7th Embodiment of this invention. It is the schematic diagram which showed schematic structure and the refrigerant | coolant flow of the evaporator which concerns on 8th Embodiment of this invention.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
1st Embodiment which is one Embodiment of this invention is described according to FIGS. 1-3. FIG. 1 is an external perspective view showing an overall configuration of an evaporator 1 according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a part of the core unit 100 that is a heat exchange unit of the evaporator 1. FIG. 3 is a schematic diagram for explaining the configuration and refrigerant flow of the evaporator 1 of the present embodiment.

  The evaporator 1 is a component disposed in a refrigeration cycle apparatus used in a vehicle air conditioner. The refrigerant compressed to a high temperature and high pressure by a compressor is radiated and cooled by a radiator and reduced to a low temperature and low pressure by a decompressor. It is a heat exchanger that is evaporated after being depressurized.

  As shown in FIG. 1, the evaporator 1 is mainly composed of a core portion 100, an upper header tank 3, a lower header tank 4, and the like. As shown in FIG. 2, the core unit 100 alternately stacks a plurality of tubes 20 and a plurality of outer fins 26, and arranges side plates 28 further outside the outer fins 26 at both outermost ends in the stacking direction. Configured. The outer fin 26 is a heat exchange fin. 1 and 2, the X direction is a direction in which a plurality of tubes are arranged (lateral direction, stacking direction), the Z direction is a direction in which air flows, and the Y direction is a direction in which the tubes extend (longitudinal direction of the tubes). There is a vertical upward direction.

  The core unit 100 of the evaporator 1 has a plurality of rows in which the tubes 20 extending in the vertical direction are arranged in the horizontal direction, one row on each of the upstream side and the downstream side of the air flow that is an external fluid exchanged with the refrigerant, It is configured to be arranged in at least two rows in the air flow direction. The tube 20 is a tubular member formed such that a cross section perpendicular to the longitudinal direction (internal fluid passage direction) has a flat shape by bending a thin aluminum strip-shaped plate member. Inner fins (not shown) are joined in the tube 20.

  The core portion 100 includes a single leeward flow channel group 21 composed of a plurality of passages formed by arranging a plurality of tubes 20a extending in the vertical direction in the horizontal direction and arranged downstream of the air flow, and the vertical direction. A plurality of tubes 20b extending in the horizontal direction are arranged side by side and arranged on the upstream side of the air flow. The plurality of leeward side flow channel arrays 21 and the plurality of the windward flow channel groups 22 are overlapped and integrated in the air flow direction so as to form the core portion 100. The number of each of the leeward side flow path row group 21 and the windward side flow path row group 22 is determined by the refrigerant flow pattern in the core portion.

  The refrigerant flowing through each leeward flow channel group 21 flows in the same direction in a plurality of tubes constituting the flow channel group, and the plurality of leeward flow channel groups 21 pass through the inside of the leeward header tank 11. It is communicated. The refrigerant flowing through each windward flow channel group 22 flows in the same direction in a plurality of tubes constituting the flow channel group, and the plurality of windward flow channel groups 22 pass through the inside of the windward header tank 12. It is communicated.

  The outer fins 26 are corrugated fins obtained by processing a thin aluminum strip material into a corrugated shape. For example, a louver for increasing the heat exchange efficiency is formed on the surface. The outer fin 26 is brazed to the outer surface of the tube 20.

  The side plate 28 is a reinforcing member in the core portion 100, and is formed by pressing an aluminum flat plate material. The longitudinal direction end portion side of the side plate 28 is formed in a flat plate shape, and most other parts are formed to have a U-shaped cross section that opens to the outside in the stacking direction of the tube 20 and the outer fin 26. The outer fin 26 is brazed.

  The leeward header tank 11 includes a leeward upper tank 31 connected to the upper ends of the plurality of leeward flow channel groups 21 and a leeward lower tank 41 connected to the lower ends of the plurality of leeward flow channel groups 21. , A chamber in which the refrigerant flowing in from the plurality of tubes constituting the leeward flow path row group 21 is collected, and a chamber for distributing the refrigerant into the plurality of tubes constituting the leeward flow path row group 21. .

  A block-shaped connector 5 is brazed and joined to the left side end portion (the end portion on the opposite side in the X direction) of the leeward side upper tank 31 so that the connector 5 introduces the refrigerant into the core portion 100. An inlet 51 is provided as a refrigerant inlet provided to communicate with the inside of the leeward header tank 11. The inflow port 51 communicates with an end portion on the side opposite to the X direction in the leeward side lower tank 41 through a side passage (not shown).

  The windward header tank 12 includes a windward upper tank 32 connected to the upper ends of the plurality of windward flow channel groups 22 and a windward lower tank 42 connected to the lower ends of the plurality of windward flow channel groups 22. , A chamber in which the refrigerant flowing in from the plurality of tubes constituting the windward flow path row group 22 is collected, and a chamber for distributing the refrigerant into the plurality of tubes constituting the windward flow path row group 22. .

  A block-shaped connector 5 is brazed and joined to the left side end (the end opposite to the X direction) of the windward upper tank 32, and the refrigerant is refrigeration cycle from the inside of the core unit 100 to the connector 5. An outlet 52 as a refrigerant outlet is provided so as to communicate with the inside of the upwind header tank 12 so as to flow out to an external part of the apparatus. Thus, the inflow port 51 and the outflow port 52 are provided on the same side (one side opposite to the X direction in the present embodiment) of one side end portion of each header tank 11, 12.

  The upper header tank 3 is composed of a tank header on the side opposite to the tube divided in the longitudinal direction of the tube 20 (extension direction, internal fluid passage direction) and a plate header on the tube side, and is provided with a cap. A tank 31 and an upwind upper tank 32 are included. Each of the tank header and the plate header has a cross-sectional shape in which two semicircular shapes or two semirectangular shapes are connected, and is formed by pressing an aluminum flat plate. Both headers are fitted and brazed to each other to form a cylindrical body in which two internal spaces are arranged in the flow direction of the blown air. Caps formed by pressing a flat plate made of aluminum by brazing are brazed and joined to the openings at the longitudinal ends of the leeward upper tank 31 and the leeward upper tank 32 to close the openings.

  Further, a plurality of separators (see FIG. 3) that divide the two internal spaces in the X direction (lateral direction) are brazed and joined to the upper header tank 3. The interior of the leeward upper tank 32 is divided into two spaces laterally by a separator 32a (windward upper partition wall), and the interior of the leeward upper tank 31 is laterally separated by a separator 31a (leeward upper partition wall). It is divided into two spaces.

  The separator 31a has a leeward side stream group 21a, 210 as an ascending path line group in which the refrigerant flow is an upward flow in the core part on the leeward side and a leeward side as a downflow path group group in which the refrigerant flow is a downward flow. It is a leeward side partition wall that is provided in the leeward side upper tank 31 so as to be adjacent to the channel group 21b and reverses the upward flow and the downward flow. The separator 32a is provided on the windward side as an upwind flow path line group 22a, 220 as an ascending flow path line group in which the refrigerant flow is an upflow in the core part on the windward side and a downflow path line group as a flow down the refrigerant flow. It is an upwind partition wall that is provided in the upwind upper tank 32 so as to be adjacent to the channel group 22b and reverses the upflow and downflow.

  In the region on the right side (X direction) of the separator 31 a inside the leeward upper tank 31, there are a plurality of laterally right internal spaces of the leeward upper tank 31 and laterally right internal spaces of the leeward upper tank 32. The first upper communication holes 300 (in this embodiment, two first upper communication holes 300) communicate with each other.

  The first upper communication hole 300 is configured so that the inside of the tank provided on the other side in the horizontal direction with respect to the end on the same side in the horizontal direction where the inflow port 51 and the outflow port 52 are arranged is on the leeward side and the upwind side. The leeward side upper tank 311 that is formed on the partition wall and is connected to the leeward side channel group 210 (hereinafter also referred to as the farthest leeward side channel group 210) located farthest from the inflow port 51. And the inside of the windward upper tank 321 connected to the windward flow channel group 220 (hereinafter also referred to as the furthest windward flow channel group 220) located farthest from the outlet 52. It becomes a communication means to communicate. The first upper communication hole 300 is formed in the first upper communication passage 33 through which the refrigerant in the farthest leeward upper tank 311 moves to the windward side and flows into the windward upper tank 321. There are also some.

  The first upper communication path 33 is an upper side that connects the inside of the leeward upper tank 311 that is farthest from the inflow port 51 and the inside of the leeward upper tank 321 that is farthest from the outflow port 52. It is a communication path. The inside of the leeward side upper tank 311 is a space on the side farther from the inflow port 51 out of the two spaces partitioned in the lateral direction by the separator 31a, and the inside of the leeward upper tank 321 is laterally partitioned by the separator 32a. Of these two spaces, the space is on the far side from the outlet 52.

  The lower header tank 4 has a form similar to that of the upper header tank 3 described above, and caps are provided at openings at both ends in the longitudinal direction of the cylindrical body constituted by the tank header and the plate header. And an upwind lower tank 42.

  Further, a plurality of separators (see FIG. 3) that divide the two internal spaces in the X direction (lateral direction) are brazed and joined to the lower header tank 4. The interior of the leeward lower tank 42 is divided into two spaces laterally by a separator 42a (windward lower partition wall), and the interior of the leeward lower tank 41 is laterally separated by a separator 41a (leeward lower partition wall). It is divided into two spaces. Further, a throttle plate 41b having a through-hole formed in the center is provided in a portion of the leeward side lower tank 41 located at the boundary between the leeward side channel group 21b and the leeward side channel group 210. ing. The throttle plate 41b functions as a flow resistance portion that provides flow resistance to the flow of the refrigerant by including a through hole having an opening area smaller than the flow path cross section inside the leeward lower tank 411.

  The separator 41a has a leeward side stream group 21a, 210 as an ascending path line group where the refrigerant flow is an upward flow in the core part on the leeward side and a leeward side as a downward path line group where the refrigerant flow is a downward flow. It is a leeward side partition wall that is provided in the leeward side lower tank 41 so as to be adjacent to the flow path row group 21b and reverses the upward flow and the downward flow. The separator 42a is provided on the windward side of the windward channel group 22a, 220 as the ascending channel group in which the refrigerant flow is an upward flow in the core part on the windward side and as the downflow channel group in which the refrigerant flow is the downward flow. It is an upwind partition wall that is provided in the upwind lower tank 42 so as to be adjacent to the channel group 22b and reverses the upflow and downflow.

  In the region on the right side (X direction) of the throttle plate 41b inside the leeward lower tank 41, there are a plurality of lateral inner spaces on the leeward lower tank 41 and inner lateral spaces on the leeward lower tank 42 in the lateral direction. The first lower communication holes 400 (in this embodiment, the two first lower communication holes 400) communicate with each other.

  The first lower side communication hole 400 is configured so that the inside of the tank provided on the other side in the lateral direction with respect to the end portion on the same side in the lateral direction where the inflow port 51 and the outflow port 52 are arranged is on the windward side and the leeward side. The inside of the leeward side lower tank 411 connected to the leeward side flow path row group 210 at the part farthest from the inflow port 51 and the windward side channel at the part farthest from the outlet 52 are formed on the partition wall The communication means communicates with the inside of the windward lower tank 421 connected to the row group 220. The first lower communication hole 400 is formed in the first lower communication path 43 through which the refrigerant in the furthest leeward lower tank 411 moves to the windward side and flows into the windward lower tank 421. There are also some.

  The first lower-side communication passage 43 connects the inside of the leeward lower tank 411 that is farthest from the inflow port 51 and the inside of the leeward lower tank 421 that is farthest from the outflow port 52. It is a communication path. The inside of the leeward lower tank 411 is a space on the side farther from the inflow port 51 among the two spaces partitioned in the lateral direction by the separator 41a. The interior of the leeward lower tank 421 is laterally separated by the separator 42a. Of the two partitioned spaces, the space is located on the far side from the outlet 52.

  In a region on the right side (X direction) of the separator 41a in the leeward lower tank 41 and on the left side (opposite side in the X direction) of the throttle plate 41b, the leeward flow path row group in the leeward lower tank 411 The internal space below 21b (the internal space on the left side of the throttle plate 41b) and the internal space of the lower windward side lower tank 421 connected to the windward flow channel group 220 at the farthest part are a plurality of second spaces. The lower communication holes 401 (two second lower communication holes 401 in this embodiment) communicate with each other.

  The second lower side communication hole 401 is configured so that the inside of the tank provided on the other side in the lateral direction with respect to the end portion on the same side in the lateral direction where the inflow port 51 and the outflow port 52 are arranged is located on the windward side and the leeward side. It is formed on the partition wall. The second lower communication hole 401 is connected to the inside of the leeward lower tank 411 connected to the leeward flow channel group 21b adjacent to the leeward flow channel group 210 at the farthest part from the inlet 51, and It becomes a communication means which communicates with the inside of the windward lower tank 421 connected to the windward flow path row group 220 located farthest from the outlet 52.

  In the second lower communication hole 401, a part of the refrigerant descending the leeward side flow channel group 21b is in the entire path part 201 (a part of the refrigerant that has passed through the throttle plate 41b in the farthest part) It is also a part of the second lower side communication passage 44 that passes when it moves from the leeward side to the windward side and flows into the windward lower tank 421 before it flows into the ascending route group 210. The second lower-side communication passage 44 is located in the inner space connected to the leeward side flow channel group 21 b of the leeward lower tank 411 located farthest from the inlet 51 and in the portion farthest from the outlet 52. This is a second communication path that communicates with the internal space of the windward lower tank 421.

  That is, the evaporator 1 has the all-pass portion 201 on the leeward side and the all-pass portion 200 on the leeward side (the refrigerant that has flown through the first lower-side communication passage 43 and the second lower-side communication passage 44 at the farthest part). In addition to the first lower communication passage 43 connecting the windward flow passage row group 220), the second lower communication hole 401 is formed, so that the leeward flow passage row group 21b is formed. And a second lower communication path 44 that connects the windward flow path row group 220 and the windward flow path row group 220. Therefore, since the evaporator 1 includes the second lower side communication passage 44, not only the refrigerant flows between the windward side of all the path portions and the leeward side of all the path portions, but also the windward side of all the path portions. The refrigerant can also flow between the downstream area of the other flow path group (the downstream area of the leeward flow path group 21b). And in order to form such a refrigerant | coolant flow, the evaporator 1 forms the width | variety of a horizontal direction larger than the leeward side flow path row | line group 210 of the furthest part in the windward flow path row | line | column group 220 of the farthest part. Therefore, in all path portions, the width in the stacking direction X of the core portion on the leeward side is larger than the width in the stacking direction X of the core portion on the leeward side.

  Further, on the wall surfaces of the upper and lower header tanks 3 and 4 near the core portion 100, tube insertion ports and side plate insertion ports are provided at the same pitch in the longitudinal direction. The end portions in the longitudinal direction of the side plate 28 are inserted and brazed and joined. As a result, the tube 20 communicates with the internal space of the upper and lower header tanks 3 and 4, and the longitudinal end portion side of the side plate 28 is supported by the upper and lower header tanks 3 and 4.

  With the above configuration, a part of the refrigerant descending the leeward side flow path row group 21b passes through the second lower side communication path 44 and enters the windward lower tank 421, and further, the furthest windward flow path at the farthest part. The column group 220 moves up and flows into the windward upper tank 321. On the other hand, the remainder of the refrigerant descending the leeward side flow channel array group 21b is flown into the leeward lower tank 421 through the first lower side passage 43 after being subjected to flow resistance by the throttle plate 41b. The leeward side flow path row group 210 at the far site is raised and divided into a flow passing through the first upper communication path 33. The flow that has entered the leeward lower tank 421 from the first lower communication passage 43 joins with the refrigerant that has passed through the second lower communication passage 44 from the leeward flow channel group 21b, and this merging The refrigerant that has risen up the farthest windward flow channel group 220 and merged with the flow that has passed through the first upper communication path 33 from the leeward flow channel group 210 in the windward upper tank 321. To do.

  The refrigerant flow pattern in the evaporator 1 described in the present embodiment is such that the leeward side channel row group has one leeward side channel row group 21a (refrigerant rising portion) and one leeward side channel row group 21b. (Refrigerant descending part) Three flow path groups composed of one furthest part leeward side stream line group 210, and the flow path group on the windward side has one farthest part windward flow. A pattern constituted by three flow path row groups consisting of a path row group 220, one windward flow passage row group 22b (refrigerant descending portion), and one windward flow passage row group 22a (refrigerant rise portion). It is.

  In this case, the number of refrigerant passes is counted as follows. That is, the refrigerant flows in the farthest leeward flow channel group 210 and the furthest windward flow channel group 220 of the farthest part where the refrigerant flows in the same direction upward are counted as one refrigerant path. In addition to this, the number of leeward side flow channel groups 21a and 21b other than the farthest leeward flow channel group 210 out of the plurality of leeward flow channel groups 21 (two in total here) And among the plurality of windward flow channel groups 22, the number of windward flow channel groups 22a and 22b other than the windward flow channel group 220 of the farthest part (here, a total of two), Count together. Thereby, in this embodiment, the number of refrigerant | coolant paths which flow through the core part 100 is five paths. In addition, the refrigerant flow pattern in the evaporator 1 is as follows: the leeward side flow channel row group 21, the windward side flow channel row group 22, and all the path portions 200 (portions where the refrigerant diverted from the leeward side to the windward side rises). When the number of passes is described in the order in which the refrigerant flows, a refrigerant pattern of 2-1-2 is obtained.

  Next, the flow of the refrigerant in the evaporator 1 having the above configuration will be described in order. The refrigerant from the external components of the refrigeration cycle apparatus flows from the lower inlet 51 into the leeward lower tank 41 which is a space on the left side in the lateral direction (opposite to the X direction) from the separator 41a, and then the leeward side. The flow path row group 21a is lifted (first pass), and further inverted inside the leeward side upper tank 31 that is a space on the left side in the lateral direction (opposite to the X direction) from the separator 31a. It descends 21b (second pass) and flows into the leeward lower tank 411 at the farthest part.

  First, a part of the refrigerant in the leeward lower tank 411 is distributed on the upstream side of the throttle plate 41b, and the second refrigerant is directed toward the leeward side via the two second lower communication holes 401. The windward upper tank 321 flows through the lower communication passage 44 and moves to the windward side and ascends from the windward lower tank 421 to the farthest windward flow channel group 220 (third pass, all pass part 200). to go into.

  On the other hand, after the remaining refrigerant in the leeward lower tank 411 passes through the through hole of the throttle plate 41b, it rises in the farthest leeward flow channel group 210 (third pass, all pass portion 201). The refrigerant flow from the leeward upper tank 311 through the first upper communication hole 300 to the windward side through the first upper communication passage 33 and entering the windward upper tank 321 and the throttle plate 41b After passing through the through hole, the first lower side communication passage 43 flows toward the windward side via the first lower side communication hole 400, and the second lower side communication passage 44 passes through the first upper side tank 421. It is divided into a refrigerant flow that merges with the flow that has passed through.

  Next, the refrigerant merged in the windward upper tank 321 is reversed to descend the windward flow path group 22b (fourth pass), and is further reversed in the windward lower tank 42, so that the windward flow path array The group 22a is raised (fifth pass) and flows out from the windward upper tank 32 through the upper outlet 52.

  In the above conventional evaporator, when the lateral length of all the path portions where the windward flow channel row group and the leeward flow channel row group are connected via the tank portion is reduced, the refrigerant is inertial. Since the core width is short even if it flows largely toward the end side of the core portion due to the force, the air blown from the core portion can be made to approach a uniform temperature distribution. However, when the lateral length of all the path portions is shortened, the area for forming the communication hole for communicating the leeward tank and the leeward tank portion is small, so that the cross-sectional area of the communication passage is small. It will be. For this reason, the pressure loss of the refrigerant flow in the evaporator is inevitably increased, and the cooling performance and efficiency of the evaporator are reduced.

  Therefore, according to the evaporator 1 of the present embodiment, the above-described problems are solved, and the wind connected to the windward flow channel group 220 having the longer lateral length at the farthest part. An upper lower tank 421 and a second leeward lower tank 411 connected to the leeward flow channel group 21b located upstream of the refrigerant flow than the leeward flow channel group 210 having a shorter lateral length The lower side communication path 44 is further connected. For this reason, not only the windward lower tank 421 and the leeward lower tank 411 in the farthest part communicate with each other in the first lower communication path 43 but also the second lower communication path 44 has a further passage cross-sectional area. Enlargement can be achieved. In other words, in addition to the entire path portion, a communication path that connects the leeward side and the leeward side is provided. As a result, the effects of both reducing the pressure loss when passing through the communication passage when the refrigerant flows from the leeward lower tank 411 to the leeward lower tank 421 and suppressing the lateral length of all the paths are achieved. It plays. Therefore, it is possible to provide the evaporator 1 that achieves both a reduction in the pressure loss of the refrigerant flow and optimization of the temperature distribution of the air blown from the core unit 100.

  In addition, the evaporator 1 is in the leeward lower tank 411 to which the second lower communication passage 44 is connected, and after the refrigerant is partly divided into the second lower communication passage 44, the first A throttle plate 41b serving as a throttle part that throttles the cross-sectional area of the refrigerant is provided at a portion where the remaining refrigerant flows toward the lower communication path 43 of the cylinder.

  According to this configuration, by providing the throttle portion, the throttle portion serves as a flow resistance of the refrigerant flowing to the first lower communication path 43 side. Therefore, the amount of refrigerant flowing through the through hole of the throttle plate 41b is reduced. Suppressed and the tendency of the refrigerant to easily flow to a site away from the adjacent leeward flow path group 21b by the action of inertia can be improved. Therefore, it is possible to correct the deviation of the refrigerant flow rate distribution in the lateral direction in the flow path row group of all the path parts, and to promote the formation of a good temperature distribution of the air blown out from the core part 100.

  In addition, the throttle plate 41b is configured by a partition wall in which a through hole is formed. Thus, if a partition wall having a through hole of an appropriate size is provided inside the tank, a throttle having a desired flow resistance is configured. be able to. Therefore, it is possible to form blown air having a good temperature distribution without complicating the configuration of the evaporator 1.

  Further, the windward side flow channel group 220 at the part farthest from the outlet 52 is a channel line group having a longer lateral length than the leeward side channel group 210 at the part farthest from the inlet 51. is there. The second lower communication passage 44 has an inner side of the windward lower tank 421 to which the windward flow path row group 220 of the farthest part in the longer horizontal direction is connected, and has a horizontal length. It communicates with the inside of the leeward lower tank 411 to which the leeward flow channel group 21b located next to the shortest farthest leeward flow channel group 210 is connected in the lateral direction.

  According to this configuration, the evaporator 1 having all the path portions 201 and 200 in which the lateral length of the leeward flow path column group 210 is shortened with respect to the windward flow path column group 220 is obtained. Thereby, the evaporator 1 which improves the bias | inclination of the temperature distribution of the blowing air in the leeward side flow path row | line | column group 210 can be provided, suppressing the pressure loss in the windward side flow path row | line | column group 220. FIG.

  Further, in the case of the evaporator 1 in which the inflow port 51 and the outflow port 52 are concentrated on one side in the width direction of the core portion 100, a region near the outflow port 52 of the windward flow path row group 22 is a refrigerant overheat region ( Super heat range). Therefore, the part where liquid refrigerant is likely to stagnate is the part farthest from the inflow port 51 and the outflow port 52, and is the farthest leeward side flow channel group in contact with the cooler air. In the evaporator 1 of this embodiment, generation | occurrence | production of stagnation of a liquid refrigerant can be improved.

(Second Embodiment)
In the second embodiment, another embodiment of the evaporator 1 described in the first embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram for explaining the configuration of the evaporator 1A and the refrigerant flow according to the second embodiment.

  With respect to the evaporator 1 shown in FIG. 3, the evaporator 1 </ b> A includes a flow path configuration in which the second lower communication path 44 is replaced with a second upper communication path 34, an inlet 51 and an outlet 52. The leeward side flow channel array group 210 at the farthest part has a configuration in which the lateral length is longer than the upwind side. The evaporator 1A has the same configuration as that of the evaporator 1 in FIG. 3 except for the elements related to these configurations, and the operation and effects thereof are also the same.

  Inside the leeward side upper tank 311 at the farthest part, a throttle plate 31b having a through hole formed in the center is provided so as to partition the lateral space into two. The throttle plate 31b functions as a flow resistance unit that provides flow resistance to the flow of the refrigerant by including a through hole having an opening area smaller than the flow path cross section inside the leeward upper tank 311.

  In the region on the right side (X direction) of the throttle plate 31b inside the leeward upper tank 311, the inner space on the right side in the horizontal direction of the leeward upper tank 311 and the inner space of the leeward upper tank 321 at the farthest part are formed. The plurality of first upper communication holes 300 (in the present embodiment, two first upper communication holes 300) communicate with each other.

  The first upper side communication hole 300 is defined as a leeward side inside a tank provided on the other side in the horizontal direction with respect to one side end in the horizontal direction in which the inlet 51 is disposed in the lower part and the outlet 52 is disposed in the upper part. It is formed on a wall that is divided into the windward side, and is located inside the leeward upper tank 311 that is connected to the leeward side flow channel array group 210 at the farthest part from the inflow port 51, and at the farthest side from the outflow port 52. It becomes a communication means which connects the inside of the windward upper tank 321 connected to the flow path row group 220. The first upper communication hole 300 is formed in the first upper communication passage 33 through which the refrigerant in the farthest leeward upper tank 311 moves to the windward side and flows into the windward upper tank 321. There is also a part.

  The first upper-side communication passage 33 communicates the inside of the leeward upper tank 311 farthest from the inflow port 51 and the inside of the upwind upper tank 321 farthest from the outlet 52. It is a passage.

  In the region on the right side (X direction) of the separator 31a inside the leeward side upper tank 41 and on the left side (opposite side of the X direction) of the throttle plate 31b, it is connected to the leeward side flow channel group 210 at the farthest part. The internal space of the upper leeward upper tank 311 and the internal space above the windward flow path group 22b in the windward upper tank 321 (the internal space on the left side of the throttle plate 31b) are a plurality of second spaces. The upper communication holes 301 (in this embodiment, two second upper communication holes 301) communicate with each other.

  The second upper side communication hole 301 is configured so that the inside of the tank provided on the other side in the lateral direction with respect to the end portion on the one side in the lateral direction where the inflow port 51 and the outflow port 52 are arranged is located on the windward side and the leeward side. Are formed in a wall that is partitioned into the leeward side upper tank 311 that is connected to the leeward side flow channel array group 210 that is farthest from the inlet 51, and the windward channel that is farthest from the outlet 52. It becomes a communication means which communicates with the inside of the windward upper tank 321 connected to the windward flow path row group 22b adjacent to the row group 220.

  The second upper-side communication hole 301 is configured so that the refrigerant that has risen through the leeward side flow channel group 210 that constitutes the leeward side all-pass part 201A flows in all the path parts. It is also a part of the second upper communication path 34 that passes from the leeward side toward the windward side when diverted to the flow flowing into the tank located next to the left side of 200A.

  The second upper communication passage 34 includes an internal space of the leeward upper tank 311 located farthest from the inflow port 51 and an upwind flow channel group 22b of the leeward upper tank 321 farthest from the outflow port 52. It is the 2nd communicating path which connects the interior space connected to.

  That is, the evaporator 1A includes all the path portions 201A on the leeward side (the farthest part, and the refrigerant that is divided into the first upper side communication path 33 and the second upper side communication path 34 has the windward side flow path group. In addition to the first upper communication path 33 that connects the portion 200 that rises 210) and all the path sections 200A on the windward side, the second upper communication hole 301 is formed, so that the windward flow path row group 22 b and a second upper communication path 34 that connects the leeward flow path array group 210. Accordingly, since the evaporator 1A includes the second upper communication path 34, the evaporator 1A not only allows the refrigerant to flow between the leeward side of all the path parts and the leeward side of all the path parts, but also the leeward side of all the path parts. The refrigerant can also flow between the upstream region of another channel row group (the upstream region of the windward flow channel group 22b). In order to form such a refrigerant flow, the evaporator 1A is formed such that the farthest leeward side flow channel group 210 is wider in the lateral direction than the farthest leeward side flow channel group 220. Therefore, in all the path portions, the width in the stacking direction X of the core portion on the leeward side is larger than the width in the stacking direction X of the core portion on the leeward side.

  With the above configuration, a part of the refrigerant rising in the leeward side flow passage group 210 enters the windward upper tank 321 through the second upper communication path 34, and further adjacent to the windward side flow passage group. It flows down 22b. On the other hand, the remaining refrigerant rising in the leeward side flow channel array group 210 is influenced by the flow resistance at the throttle plate 31b and decreases the inertial force, so that the flow rate is reduced and the first upper side passage 33 passes through. Enter the windward upper tank 321. In this way, the refrigerant once splits, and the flow that has passed through the second upper communication passage 34 and the flow that has passed through the first upper communication passage 33 merge in the upwind upper tank 321. . In other words, the refrigerant tends to flow to the first upper communication path 33 and the refrigerant that flows to the second upper communication path 34 by the action of the second upper communication path 34 and the throttle plate 31b. The refrigerant flows up and down the leeward side flow channel array group 210 in the form of being divided into the refrigerant, and the flow rate of the refrigerant to be divided is determined.

  Then, the merged refrigerant descends in the adjacent windward side flow channel group 22b, makes a U-turn in the windward lower side tank 42 and rises in the leeward side flow channel group 22a. It enters the side part and flows out from the outlet 52 to the outside. The refrigerant flow pattern in the evaporator 1A is the same as that of the evaporator 1, and is a refrigerant pattern of 2-1-2 with five refrigerant paths.

  According to the evaporator 1A of the present embodiment, the problem of the conventional evaporator described above is solved, and the farthest part is connected to the leeward side flow channel group 210 having a longer lateral length. A leeward upper tank 311 and a leeward upper tank 321 connected to the windward flow channel group 22b located downstream of the refrigerant flow stream group 220 with the shorter lateral length than the windward flow channel group 22b. The second communication path 34 is further connected. For this reason, not only the windward upper tank 321 and the leeward upper tank 311 at the farthest part communicate with each other through the first upper communication path 33 but also the second upper communication path 34 has a further passage cross-sectional area. Enlargement can be achieved. That is, in addition to all the path portions 200A, a communication path that connects the leeward side and the leeward side is provided. Thereby, both the effects of reducing the pressure loss at the time of passage through the communication path when the refrigerant flows from the leeward upper tank 311 to the leeward upper tank 321 and suppressing the lateral length of all the path portions 200A. Is played. Therefore, it is possible to provide the evaporator 1 </ b> A that achieves both a reduction in the pressure loss of the refrigerant flow and an optimization of the temperature distribution of the air blown from the core unit 100.

  The evaporator 1A includes a throttle plate 31b as a throttle section that throttles the cross-sectional area of the passage inside the leeward upper tank 311 to which the second upper communication passage 34 is connected, and the second upper communication passage 34 in the lateral direction. It is provided between the first upper communication path 33.

  According to this configuration, since the throttle portion serves as a flow resistance of the refrigerant flowing to the first upper communication path 33 side, the deviation of the refrigerant flow distribution in the lateral direction flowing through the flow path row group of all the path portions 201A is reduced. It is possible to correct and promote the formation of a good temperature distribution of the air blown out from the core unit 100.

  In addition, the throttle plate 31b is configured by a partition wall having a through hole, so that if a partition wall having a through hole of an appropriate size is provided inside the tank, a throttle having a desired flow resistance is configured. be able to. Therefore, it is possible to form blown air having a good temperature distribution without complicating the configuration of the evaporator 1A.

  Further, the leeward side flow channel group 210 (or all the path portions 201) at the part farthest from the inflow port 51 is longer in the lateral direction than the windward side flow channel group 220 at the part farthest from the outflow port 52. Is a long channel array group. The second upper communication passage 34 has a length in the leeward side upper tank 311 to which the leeward side flow channel group 210 in the farthest part of the longer side in the horizontal direction is connected and the length in the horizontal direction. It communicates with the inside of the windward upper tank 321 to which the windward flow channel group 22b located next to the shortest farthest windward flow channel group 220 is connected in the lateral direction.

  According to this configuration, the evaporator 1A having all the path portions 201A and 200A in which the lateral length of the windward flow channel group 220 is shortened with respect to the leeward flow channel group 210 is obtained. Accordingly, it is possible to provide the evaporator 1A that improves the bias of the temperature distribution of the blown-out air in the windward flow channel group 220 while suppressing the pressure loss in the leeward flow channel group 210.

(Third embodiment)
In the third embodiment, another form of the evaporator 1A described in the second embodiment (when the refrigerant flow is 3 passes and the refrigerant flow pattern is 1-1-1) will be described with reference to FIG. FIG. 5 is a schematic diagram showing the configuration of the evaporator 1B and the refrigerant flow when the refrigerant flow pattern is 1-1-1.

  The evaporator 1B of the present embodiment has a configuration of the core unit 101, the number of refrigerant paths is three, and the refrigerant flow pattern is 1-1-1, with respect to the evaporator 1A illustrated in FIG. The difference is that the refrigerant flow in the flow path row group at the farthest part is a downward flow. About another structure, it is the same as that of the evaporator 1A of FIG. 4, and the effect is also the same.

  The refrigerant flow pattern in the evaporator 1B of the present embodiment is such that the leeward side channel row group has one leeward side channel row group 21a (refrigerant rising portion), and one farthest leeward side channel row. Group 211 (refrigerant descending portion), two flow passage row groups, where the flow passage row group on the windward side is one furthest windward flow passage row group 221 (refrigerant lowering portion), one It is a pattern comprised of two flow path row groups consisting of the windward flow path row group 22a (refrigerant rising portion).

  Thereby, in this embodiment, the number of refrigerant paths which flow through core part 101 is three passes. Further, the refrigerant flow pattern includes the leeward side flow channel row group 21, the windward side flow channel row group 22, all the path portions 201 (the furthest side windward flow channel row group 211, and the refrigerant flows from the leeward side to the windward side. ) And the total number of passes 200 (the portion of the farthest windward flow channel group 221 where the refrigerant not diverted to the windward descends) is described in the order in which the refrigerant flows. 1-1-1 pattern.

  The inside of the leeward side lower tank 41 is divided into two spaces laterally by a separator 41a (leeward side lower partition wall), and the inside of the leeward upper tank 32 is laterally separated by a separator 32a (leeward upper partition wall). It is divided into two spaces. Further, a throttle plate 31b having a through-hole formed in the center is provided in the leeward side upper tank 31 at the same position in the lateral direction as the separator 41a. The throttle plate 31b functions as a flow resistance unit that provides flow resistance to the flow of the refrigerant by including a through hole having an opening area smaller than the flow path cross section inside the leeward upper tank 311.

  The separator 41a has a leeward side flow channel group 21a as an ascending flow channel sequence group in which the refrigerant flow is an upward flow in the leeward core portion and a leeward flow channel as a down flow channel sequence group in which the refrigerant flow is downward. It is a leeward side partition wall that is provided in the leeward side lower tank 41 so as to be adjacent to the row group 211 and reverses the upward flow and the downward flow. The separator 32a includes a windward flow path array group 221 as a descending flow path array group in which the refrigerant flow is a downward flow in the windward core portion and an windward flow path as an ascending flow path array group in which the refrigerant flow is an upward flow. It is an upwind partition wall that is provided in the upwind upper tank 32 so as to be adjacent to the row group 22a and reverses the upflow and downflow.

  In the region on the right side (X direction) of the throttle plate 31b in the leeward upper tank 31, there are a plurality of inner spaces on the right side in the leeward upper tank 31 and inner spaces on the right side in the leeward upper tank 32. The first upper communication holes 300 (in the present embodiment, the two first upper communication holes 300) communicate with each other.

  The first upper side communication hole 300 is configured so that the inside of the tank provided on the other side in the lateral direction with respect to the end portion on the same side in the lateral direction where the inflow port 51 and the outflow port 52 are arranged is located on the windward side and the leeward side. It is formed on the partition wall. The first upper side communication hole 300 includes an inside of the leeward side upper tank 311 connected to the leeward side channel group 211 of the farthest part from the inflow port 51 and an upwind side channel of the farthest part from the outlet 52. It becomes a communication means which connects the inside of the windward upper tank 321 connected to the row group 221. The first upper communication hole 300 is formed in the first upper communication passage 33 through which the refrigerant in the farthest leeward upper tank 311 moves to the windward side and flows into the windward upper tank 321. There is also a part.

  The first lower communication passage 43 communicates the inside of the leeward lower tank 411 farthest from the inlet 51 and the inside of the windward lower tank 421 farthest from the outlet 52. It is a passage. The inside of the leeward lower tank 411 is a space on the side farther from the inflow port 51 out of the two spaces partitioned in the lateral direction by the separator 41a, and the inside of the leeward lower tank 421 is the wind of the core part 101. Occupies the entire lateral direction in the upper lower tank.

  In an area on the left side (opposite side in the X direction) inside the leeward upper tank 31, the internal space above the leeward flow channel group 21a inside the leeward upper tank 311 (on the left side of the throttle plate 31b). ) And the internal space of the upper windward upper tank 321 connected to the farthest windward flow channel group 221 are a plurality of second upper communication holes 301 (two in this embodiment). The second upper communication holes 301) communicate with each other.

  The second upper communication hole 301 is formed so that the inside of the tank provided on the other side in the lateral direction with respect to the end on the same side in the lateral direction where the inflow port 51 and the outflow port 52 are arranged is on the windward side and the leeward side. It is formed on the partition wall. The second upper communication hole 301 is connected to the inside of the leeward upper tank 311 connected to the leeward flow channel group 21a adjacent to the leeward flow channel group 211 at the farthest part from the inlet 51, and It becomes a communication means which connects the inside of the windward upper tank 321 connected to the windward flow path row group 221 at the farthest part from the outlet 52.

  The second upper communication hole 301 moves from the leeward side to the windward side before a part of the refrigerant that has risen through the leeward flow channel array group 21a flows into all the path portions 201, and moves to the windward upper tank 321. It is also a part of the second upper communication passage 34 that passes through when flowing in. The second upper communication path 34 includes an internal space connected to the leeward side flow channel group 21 a of the leeward upper tank 311 located farthest from the inlet 51, and the windward farthest part from the outlet 52. This is a second communication path that communicates with the internal space of the upper tank 321.

  That is, in the evaporator 1B, the second upper communication hole 301 is formed in addition to the first upper communication path 33 that connects all the path sections 201 on the leeward side and all the path sections 200 on the leeward side. Thus, a second upper communication path 34 that connects the leeward flow path row group 21a and the windward flow path row group 221 is provided. Therefore, since the evaporator 1B includes the second upper communication passage 34, not only the refrigerant flows between the windward side of all the path portions and the leeward side of all the path portions, but also the windward side of all the path portions. The refrigerant can also flow between the downstream area of the other leeward flow path group (the downstream area of the leeward flow path group 21a). And in order to form such a refrigerant | coolant flow, the evaporator 1B forms the width | variety of a horizontal direction larger than the leeward side flow path row | line group 211 of the furthest side leeward side flow path group 221 in the farthest part. Therefore, in all path portions, the width in the stacking direction X of the core portion on the leeward side is larger than the width in the stacking direction X of the core portion on the leeward side.

  With the above configuration, a part of the refrigerant that has risen in the leeward flow channel group 21a passes through the second upper communication passage 34 and enters the windward upper tank 321, and further the windward flow channel at the farthest part. It flows down the row group 221 and flows into the windward lower tank 421. On the other hand, the remaining refrigerant that has risen up the leeward side flow channel array group 21a is flown into the leeward upper tank 321 through the first upper side passage 33 after receiving flow resistance at the throttle plate 31b. The leeward side flow channel array group 211 at the far site descends and is divided into a flow passing through the first lower side communication passage 43. Then, the flow that has entered the leeward upper tank 321 from the first upper communication passage 33 joins with the refrigerant that has passed through the second upper communication passage 34 from the leeward flow channel group 21a, and this merging The raised refrigerant rises in the furthest windward flow channel group 221 and merges with the flow passing through the first lower communication passage 43 from the leeward flow channel group 211 in the windward lower tank 421. To do.

  Next, the flow of the refrigerant in the evaporator 1B having the above configuration will be described in order. The refrigerant from the external components of the refrigeration cycle apparatus flows from the lower inlet 51 into the leeward lower tank 41 that is the space on the left side (opposite to the X direction) of the separator 41a, and then the leeward flow path. The row group 21a is raised (first pass) and flows into the leeward side upper tank 311. First, a part of the refrigerant in the leeward upper tank 311 is distributed on the upstream side of the throttle plate 31b, and the second refrigerant flows toward the leeward side via the two second upper communication holes 301. The windward lower tank 421 flows through the upper communication passage 34 and moves to the windward side and descends from the windward upper side tank 321 to the farthest windward flow channel group 221 (second pass, all pass part 200). to go into.

  On the other hand, after the remaining refrigerant in the leeward side upper tank 311 passes through the through hole of the throttle plate 31b, it descends the leeward side flow channel group 211 at the farthest part (second pass, all pass part 201). The refrigerant flowing from the leeward lower tank 411 through the first lower communication hole 400 toward the windward side through the first lower communication passage 43 and entering the windward lower tank 421, and the throttle plate 31b After passing through the through-hole, it flows through the first upper communication passage 33 toward the windward side via the first upper communication hole 300, and the leeward flow path row group at the farthest part from the inside of the windward upper tank 321. The refrigerant flows down 221 and enters the windward lower tank 421, and is divided into a refrigerant flow that merges with the flow that has passed through the first lower communication passage 43. That is, the refrigerant passing through the second upper communication passage 34 and the refrigerant passing through the first upper communication passage 33 merge in the upwind upper tank 321, and the merged refrigerant is the first lower communication passage. This is because the refrigerant passing through 43 and the upwind lower tank 421 join together.

  Next, the refrigerant merged in the windward lower tank 421 is reversed and ascends in the windward flow channel group 22a (third pass), and in the space on the left side in the lateral direction (opposite to the X direction) from the separator 32a. It flows out from the inside of a certain upwind upper tank 32 through the upper outlet 52.

  According to the evaporator 1B of the present embodiment, the problem of the conventional evaporator as described above is solved, and in the farthest part, the windward channel group 221 having the longer lateral length is added. The leeward upper tank 311 connected to the leeward upper stream tank group 321 located on the upstream side of the refrigerant flow with respect to the leeward upper stream tank group 321 connected to the leeward upper stream tank group 321 having a shorter lateral length. Are further connected by the second upper communication path 34. For this reason, not only the windward upper tank 321 and the leeward upper tank 311 at the farthest part communicate with each other through the first upper communication path 33 but also the second upper communication path 34 has a further passage cross-sectional area. Enlargement can be achieved. In other words, in addition to the entire path portion, a communication path that connects the leeward side and the leeward side is provided. As a result, the effects of both reducing the pressure loss when passing through the communication passage when the refrigerant flows from the leeward upper tank 311 to the leeward upper tank 321 and suppressing the lateral length of all the paths are achieved. It plays. Therefore, it is possible to provide an evaporator 1B that achieves both a reduction in the pressure loss of the refrigerant flow and optimization of the temperature distribution of the air blown from the core portion 101.

  In addition, the evaporator 1B is located inside the leeward upper tank 311 to which the second upper communication path 34 is connected, and after the refrigerant partially diverts to the second upper communication path 34, the first A throttle plate 31b is provided as a throttle part that throttles the passage cross-sectional area of the refrigerant at a portion where the remaining refrigerant flows toward the upper communication path 33.

  According to this configuration, by providing the throttle portion, the throttle portion serves as a flow resistance of the refrigerant flowing to the first upper communication path 33 side, so the amount of refrigerant flowing through the through hole of the throttle plate 31b is reduced. In all the path portions 200 and 201, it is possible to improve the tendency of the refrigerant to easily flow to a site away from the adjacent leeward flow channel group 21a due to the action of the inertial force. Therefore, it is possible to correct the deviation of the refrigerant flow distribution in the horizontal direction in the flow path row group of all the path portions, and to promote the formation of a good temperature distribution of the air blown out from the core portion 101.

  In addition, the throttle plate 31b is configured by a partition wall having a through hole, so that if a partition wall having a through hole of an appropriate size is provided inside the tank, a throttle having a desired flow resistance is configured. be able to. Therefore, blown air having a good temperature distribution can be formed without complicating the configuration of the evaporator 1B.

  Further, the windward flow channel group 221 located at the farthest position from the outlet 52 is a flow channel group having a longer lateral length than the leeward flow channel group 211 located at the furthest part from the inlet 51. is there. The second upper communication passage 34 has an inner side of the windward upper tank 321 to which the windward flow channel group 221 at the farthest part in the longer horizontal direction is connected, and has a horizontal length. It communicates with the inside of the leeward side upper tank 311 to which the leeward side channel group 21a located next to the leeward side channel group 211 in the shortest farthest part is connected.

  According to this configuration, the evaporator 1 </ b> B having all the path portions 201 and 200 in which the lateral length of the leeward flow channel group 211 is shortened with respect to the windward flow channel group 221 is obtained. Thereby, it is possible to provide the evaporator 1B that improves the deviation of the temperature distribution of the blown air in the leeward flow path column group 211 while suppressing the pressure loss in the windward flow path column group 221.

(Fourth embodiment)
In 4th Embodiment, the other form of the evaporator 1B demonstrated in 3rd Embodiment is demonstrated according to FIG. FIG. 6 is a schematic diagram for explaining the configuration and refrigerant flow of an evaporator 1C according to the fourth embodiment.

  The evaporator 1 </ b> C is different from the evaporator 1 </ b> B shown in FIG. 5 in that the second upper communication path 34 is replaced with the second lower communication path 44, the inlet 51 and the outlet 52. The leeward side flow channel group 211 in the farthest part has a configuration in which the lateral length is longer than the upwind side. The other configuration of the evaporator 1C excluding elements related to these configurations is the same as that of the evaporator 1B of FIG. 5, and the operation and effects thereof are also the same.

  Inside the leeward side lower tank 411 at the farthest part, a throttle plate 41b having a through-hole formed in the center is provided so as to partition the lateral space into two. The throttle plate 41b functions as a flow resistance portion that provides flow resistance to the flow of the refrigerant by including a through hole having an opening area smaller than the flow path cross section inside the leeward lower tank 411.

  In the area on the right side (X direction) of the throttle plate 41b inside the leeward lower tank 411, the inner space on the right side in the horizontal direction of the leeward lower tank 411 and the inner space of the furthest lower tank 421 at the farthest part are divided. The plurality of first lower communication holes 400 (in the present embodiment, two first lower communication holes 400) communicate with each other.

  The first lower-side communication hole 400 is configured such that the inside of a tank provided on the other side in the horizontal direction with respect to one side end in the horizontal direction in which the inlet 51 is disposed in the lower portion and the outlet 52 is disposed in the upper portion is defined as the leeward side. It is formed in a wall that is divided into the windward side, and is located inside the leeward lower tank 411 connected to the leeward flow path row group 211 at the farthest part from the inflow port 51, and the windward at the farthest part from the outflow port 52. It becomes a communication means which connects the inside of the windward lower tank 421 connected to the flow path row group 221. The first lower communication hole 400 is formed in the first lower communication path 43 through which the refrigerant in the furthest leeward lower tank 411 moves to the windward side and flows into the windward lower tank 421. There are also some.

  The first lower communication passage 43 communicates the inside of the leeward lower tank 411 farthest from the inlet 51 and the inside of the windward lower tank 421 farthest from the outlet 52. It is a passage.

  In the region on the right side (X direction) of the separator 41a inside the leeward lower tank 41 and on the left side (opposite side of the X direction) of the throttle plate 41b, it is connected to the leeward flow path column group 211 at the farthest part. The inner space of the lower leeward lower tank 411 and the inner space of the leeward lower tank 421 below the windward flow channel group 22a (the inner space on the left side of the throttle plate 41b) are a plurality of second spaces. The lower communication holes 401 (two second lower communication holes 401 in this embodiment) communicate with each other.

  The second lower side communication hole 401 is configured so that the inside of the tank provided on the other side in the lateral direction with respect to the end portion on the one side in the lateral direction where the inflow port 51 and the outflow port 52 are disposed Is formed in a wall that is partitioned into the leeward side lower side tank 411 connected to the leeward side flow path row group 211 farthest from the inlet 51 and the windward side flow passage row farthest from the outlet 52. It becomes a communication means which connects the inside of the windward lower tank 421 connected to the windward flow path row group 22a adjacent to the group 221.

  The second lower communication hole 401 is configured so that the refrigerant that has descended the leeward flow path array group 211 constituting the leeward all path part 201A flows in all the path parts. It is also a part of the second lower communication path 44 that passes from the leeward side toward the windward side when it is divided into the flow flowing into the tank located next to the left side of 200A.

  The second lower communication passage 44 includes an internal space of the leeward lower tank 411 farthest from the inflow port 51 and an upwind flow path group 22a of the leeward lower tank 421 farthest from the outlet 52. It is the 2nd communicating path which connects the interior space connected to.

  That is, the evaporator 1C is configured such that the refrigerant on the leeward side passes through all the path parts 201A (the farthest part, and the refrigerant which is later divided into the first lower side communication path 43 and the second lower side communication path 44 In addition to the first lower communication passage 43 that connects the lower part of the row group 211) and all the path portions 200A on the windward side, the second lower communication hole 401 is formed, so that the windward flow path is formed. A second lower-side communication path 44 that connects the row group 22a and the leeward flow path row group 211 is provided. Accordingly, since the evaporator 1C includes the second lower communication path 44, not only the refrigerant flows between the windward side of all the path portions and the leeward side of all the path portions, but also the leeward side of all the path portions. The refrigerant can also flow between the upstream region of another channel row group (the upstream region of the windward flow channel group 22a). In order to form such a refrigerant flow, the evaporator 1C is formed such that the farthest leeward side flow channel group 211 has a larger width in the lateral direction than the farthest leeward side flow channel group 221. Therefore, in all the path portions, the width in the stacking direction X of the core portion on the leeward side is larger than the width in the stacking direction X of the core portion on the leeward side.

  With the above configuration, a part of the refrigerant descending the leeward flow path column group 211 enters the windward lower tank 421 through the second lower communication path 44, and further adjacent to the windward flow path group. Ascend 22a. On the other hand, the remainder of the refrigerant descending the leeward side flow channel array group 211 is influenced by the flow resistance at the throttle plate 41b and decreases the inertial force. Therefore, the flow rate is reduced and the first lower side passage 43 passes through. Enter the windward lower tank 421. In this way, the refrigerant is once divided in the leeward lower tank 411, and the flow that has passed through the second lower communication passage 44 and the flow that has passed through the first lower passage 43 are the leeward lower tank. It is merged within 421. In other words, the refrigerant tends to flow to the first lower side communication path 34 and the refrigerant that flows to the second lower side communication path 44 by the action of the second lower side communication path 44 and the throttle plate 41b. The flow flows down the leeward side flow channel array group 211 in the form of being divided into the refrigerant, and the flow rate of the divided refrigerant is determined.

  Then, the merged refrigerant rises in the adjacent upwind flow path group 22a, enters one side portion of the upwind upper tank 32, and flows out from the outflow port 52 to the outside. The refrigerant flow pattern in the evaporator 1 </ b> C is the same as that of the evaporator 1 </ b> B, has three refrigerant paths, and is a 1-1-1 refrigerant pattern.

  According to the evaporator 1C of the present embodiment, the problem of the conventional evaporator described above is solved, and the farthest part is connected to the leeward flow channel group 211 having the longer lateral length. A leeward lower tank 411 and a leeward lower tank 421 connected to the windward flow channel group 22a located on the downstream side of the refrigerant flow than the windward flow channel group 221 having a shorter lateral length. The second lower communication path 44 is further connected. For this reason, not only the windward lower tank 421 and the leeward lower tank 411 in the farthest part communicate with each other in the first lower communication path 43 but also the second lower communication path 44 has a further passage cross-sectional area. Enlargement can be achieved. That is, in addition to all the path portions 200A, a communication path that connects the leeward side and the leeward side is provided. Thereby, both the effects of reducing the pressure loss at the time of passage through the communication path when the refrigerant flows from the leeward lower tank 411 to the leeward lower tank 421 and suppressing the lateral length of all the path portions 200A. Is played. Therefore, it is possible to provide the evaporator 1 </ b> C that achieves both reduction of the pressure loss of the refrigerant flow and optimization of the temperature distribution of the air blown from the core portion 101.

  The evaporator 1 </ b> C includes a throttle plate 41 b as a throttle portion that throttles the cross-sectional area of the passage inside the leeward lower tank 411 to which the second lower communication passage 44 is connected, and the second lower communication passage 44 in the lateral direction. It is provided between the first lower communication path 43.

  According to this configuration, since the throttle portion serves as a flow resistance of the refrigerant flowing toward the first lower communication path 43 side, the deviation of the refrigerant flow distribution in the lateral direction flowing through the flow path row group of all the path portions 201A is reduced. It is possible to correct and promote the formation of a good temperature distribution of the air blown from the core portion 101.

  In addition, the throttle plate 41b is configured by a partition wall in which a through hole is formed. Thus, if a partition wall having a through hole of an appropriate size is provided inside the tank, a throttle having a desired flow resistance is configured. be able to. Therefore, it is possible to form blown air having a good temperature distribution without complicating the configuration of the evaporator 1C.

  Further, the leeward side flow channel group 211 (or all the path portions 201A) located at the part farthest from the inflow port 51 is laterally longer than the windward side flow channel group 221 located at the part farthest from the outflow port 52. Is a long channel array group. The second lower side communication passage 44 has an inner length of the leeward side lower tank 411 to which the farthest leeward side flow channel group 211 of the farthest side in the lateral direction is connected and the lateral length. It communicates with the inside of the windward lower tank 421 to which the windward flow channel group 22a located in the lateral direction is connected to the windward flow channel group 221 at the shortest farthest part.

  According to this configuration, an evaporator 1C having all the path portions 201A and 200A in which the lateral length of the windward flow channel group 221 is shortened with respect to the leeward flow channel group 211 is obtained. Thereby, it is possible to provide the evaporator 1C that improves the deviation of the temperature distribution of the blown air in the leeward flow channel group 221 while suppressing the pressure loss in the leeward flow channel group 211.

(Fifth embodiment)
In the fifth embodiment, another form of the evaporator 1B described in the third embodiment (when the refrigerant flow is 4 passes and the refrigerant flow pattern is 2-1-1) will be described with reference to FIG. FIG. 7 is a schematic diagram showing the configuration of the evaporator 1D and the refrigerant flow when the refrigerant flow pattern is 2-1-1.

  The evaporator 1D of the present embodiment differs from the evaporator 1B shown in FIG. 5 in that the number of refrigerant paths is four and the refrigerant flow pattern is 2-1-1. About another structure, it is the same as that of the evaporator 1B of FIG. 5, and the effect is also the same.

  The pattern of the refrigerant flow in the evaporator 1D of the present embodiment is such that the leeward channel group is one leeward channel group 21b (refrigerant descending portion) and the leeward channel group 21a (refrigerant). Ascending part) is a group of three channel arrays composed of one leeward channel column group 211 (refrigerant descending unit) at the farthest part, and the channel column group on the windward side is one of the furthest site. This is a pattern composed of two flow path row groups consisting of the windward flow path row group 221 (refrigerant descending portion) and one windward flow passage row group 22a (refrigerant rise portion). Thereby, in this embodiment, the number of refrigerant | coolant paths which flow through the core part 102 is four paths. In addition, the refrigerant flow pattern is described as 2-1 when the numbers of passes of the leeward side flow path row groups 21b and 21a, the windward side flow path row group 22a, and all the path portions 201 and 200 are described in the order of flow of the refrigerant. 1 pattern.

  Next, the flow of the refrigerant in the evaporator 1D having the above configuration will be described in order. The refrigerant from the external component parts of the refrigeration cycle apparatus flows from the upper inlet 51 into the leeward upper tank 31 which is a space on the left side in the lateral direction (opposite to the X direction) from the separator 31a. The flow path group 21b descends (first pass), and further reverses inside the leeward lower tank 41, which is a space on the left side in the horizontal direction (opposite to the X direction) with respect to the separator 41a. 21a rises (second pass) and flows into the leeward upper tank 311 which is a space on the right side in the lateral direction (X direction) from the separator 31a.

  First, a part of the refrigerant in the leeward upper tank 311 is distributed on the upstream side of the throttle plate 31b, and the second refrigerant flows toward the leeward side via the two second upper communication holes 301. The windward lower tank 421 flows through the upper communication passage 34 and moves to the windward side and descends from the windward upper tank 321 in the farthest windward flow channel group 221 (third pass, all pass part 200). to go into.

  On the other hand, after the remaining refrigerant in the leeward side upper tank 311 passes through the through hole of the throttle plate 31b, it moves down the leeward side flow channel group 211 at the farthest part (third pass, all pass part 201). The refrigerant flowing from the leeward lower tank 411 through the first lower communication hole 400 toward the windward side through the first lower communication passage 43 and entering the windward lower tank 421, and the throttle plate 31b After passing through the through-hole, it flows through the first upper communication passage 33 toward the windward side via the first upper communication hole 300, and the leeward flow path row group at the farthest part from the inside of the windward upper tank 321. The refrigerant flows down 221 and enters the windward lower tank 421, and is divided into a refrigerant flow that merges with the flow that has passed through the first lower communication passage 43. That is, the refrigerant passing through the second upper communication passage 34 and the refrigerant passing through the first upper communication passage 33 merge in the upwind upper tank 321, and the merged refrigerant is the first lower communication passage. This is because the refrigerant passing through 43 and the upwind lower tank 421 join together.

  Next, the refrigerant merged in the windward lower tank 421 is reversed and ascends the windward flow channel group 22a (fourth pass), and is a space on the left side in the lateral direction (opposite to the X direction) from the separator 32a. It flows out of the windward upper tank 32 through the upper outlet 52.

(Sixth embodiment)
In the sixth embodiment, another form of the evaporator 1C described in the fourth embodiment (when the refrigerant flow is 4 passes and the refrigerant flow pattern is 2-1-1) will be described with reference to FIG. FIG. 8 is a schematic diagram showing the configuration of the evaporator 1E and the refrigerant flow when the refrigerant flow pattern is 2-1-1.

  The evaporator 1E of the present embodiment differs from the evaporator 1C shown in FIG. 6 in that the number of refrigerant paths is four and the refrigerant flow pattern is 2-1-1. About another structure, it is the same as that of 1 C of evaporators of FIG. 6, and the effect is also the same.

  The refrigerant flow pattern in the evaporator 1E of the present embodiment is such that the leeward side channel group is one leeward side channel group 21b (refrigerant descending portion), and the one leeward side channel group 21a (refrigerant). Ascending part) is a group of three channel arrays composed of one leeward channel column group 211 (refrigerant descending unit) at the farthest part, and the channel column group on the windward side is one of the furthest site. This is a pattern composed of two flow path row groups consisting of the windward flow path row group 221 (refrigerant descending portion) and one windward flow passage row group 22a (refrigerant rise portion). Thereby, in this embodiment, the number of refrigerant | coolant paths which flow through the core part 102 is four paths. In addition, the refrigerant flow pattern is described as 2-1 when the numbers of passes of the leeward side flow channel groups 21b and 21a, the windward flow channel group 22a, and all the paths 201A and 200A are described in the order of flow of the refrigerant. 1 pattern.

  With the above configuration, a part of the refrigerant descending the leeward flow path column group 211 enters the windward lower tank 421 through the second lower communication path 44, and further adjacent to the windward flow path group. Ascend 22a. On the other hand, the remainder of the refrigerant descending the leeward side flow channel array group 211 is influenced by the flow resistance at the throttle plate 41b and decreases the inertial force. Therefore, the flow rate is reduced and the first lower side passage 43 passes through. Enter the windward lower tank 421. In this way, the refrigerant once splits in the leeward lower tank 411, and the flow passing through the second lower communication passage 44 and the flow passing through the first lower passage 43 are the leeward lower tank 421. It will merge within. In other words, the refrigerant tends to flow to the first lower side communication path 34 and the refrigerant that flows to the second lower side communication path 44 by the action of the second lower side communication path 44 and the throttle plate 41b. The flow flows down the leeward side flow channel array group 211 in the form of being divided into the refrigerant, and the flow rate of the divided refrigerant is determined. And the refrigerant | coolant which merged in the windward lower tank 421 raises the adjacent windward flow path line group 22a, enters one side part of the windward upper tank 32, and flows out from the outflow port 52 outside.

(Seventh embodiment)
In the seventh embodiment, another form of the evaporator 1 described in the first embodiment (when the refrigerant flow is 6-pass and the refrigerant flow pattern is 3-1-2) will be described with reference to FIG. FIG. 9 is a schematic diagram showing the configuration of the evaporator 1F and the refrigerant flow when the refrigerant flow pattern is 3-1-2.

  The evaporator 1F of the present embodiment differs from the evaporator 1 shown in FIG. 3 in that the number of refrigerant paths is 6 and the refrigerant flow pattern is 3-1-2. About another structure, it is the same as that of the evaporator 1 of FIG. 3, and the effect is also the same.

  The pattern of the refrigerant flow in the evaporator 1F of the present embodiment is such that the leeward side channel row group includes two leeward side channel row groups 21b (refrigerant descending portion) and one leeward side channel row group 21a (refrigerant). Ascending part) is a group of four channel arrays composed of one leeward channel column group 210 (refrigerant ascending unit) at the farthest part, and the channel column group on the windward side is one of the furthest part. Three flows consisting of the windward channel group 220 (refrigerant rising part), one windward channel group 22b (refrigerant falling part), and one windward channel group 22a (refrigerant rising part) It is a pattern composed of road line groups.

  Thereby, in the present embodiment, the number of refrigerant paths flowing through the core portion 103 is six. In addition, the refrigerant flow pattern can be expressed as 3-1-2 when the number of passes of the leeward flow channel group 21, the windward flow channel group 22, and all the path parts 200 and 201 is described in the order of flow of the refrigerant. It becomes a pattern.

  With the above configuration, a part of the refrigerant descending the leeward side flow channel group 21b located next to the leeward side flow channel group 210 at the farthest part passes through the second lower side communication passage 44 and reaches the windward side. The air then enters the lower tank 421, further flows up the windward flow path row group 220 at the farthest part, and flows into the windward upper tank 321. On the other hand, the remainder of the refrigerant descending the leeward side flow channel array group 21b is flown into the leeward lower tank 421 through the first lower side passage 43 after being subjected to flow resistance by the throttle plate 41b. The distant leeward side flow channel array group 210 is lifted and divided into a flow passing through the first upper communication path 33. The flow that has entered the leeward lower tank 421 from the first lower communication passage 43 joins with the refrigerant that has passed through the second lower communication passage 44 from the leeward flow channel group 21b, and this merging The refrigerant that has risen up the farthest windward flow channel group 220 and merged with the flow that has passed through the first upper communication path 33 from the leeward flow channel group 210 in the windward upper tank 321. To do.

(Eighth embodiment)
In the eighth embodiment, another form of the evaporator 1A described in the second embodiment (when the refrigerant flow is 6-pass and the refrigerant flow pattern is 3-1-2) will be described with reference to FIG. FIG. 10 is a schematic diagram showing the configuration of the evaporator 1G and the refrigerant flow when the refrigerant flow pattern is 3-1-2.

  The evaporator 1G of the present embodiment is different from the evaporator 1A shown in FIG. 4 in that the number of refrigerant paths is six and the refrigerant flow pattern is 3-1-2. About another structure, it is the same as that of the evaporator 1A of FIG. 4, and the effect is also the same.

  The refrigerant flow pattern in the evaporator 1G of the present embodiment is such that the leeward side channel group is composed of two leeward side channel groups 21b (refrigerant descending portion) and one leeward side channel group 21a (refrigerant). Ascending part) is a group of four channel arrays composed of one leeward channel column group 210 (refrigerant ascending unit) at the farthest part, and the channel column group on the windward side is one of the furthest part. Three flows consisting of the windward channel group 220 (refrigerant rising part), one windward channel group 22b (refrigerant falling part), and one windward channel group 22a (refrigerant rising part) It is a pattern composed of road line groups.

  Thereby, in the present embodiment, the number of refrigerant paths flowing through the core portion 103 is six. In addition, the refrigerant flow pattern can be expressed as 3-1-2 when the number of passes of the leeward flow channel group 21, the windward flow channel group 22, and all the path parts 200 and 201 is described in the order of flow of the refrigerant. It becomes a pattern.

  With the above configuration, a part of the refrigerant that rises in the farthest downstream channel group 210 enters the windward upper tank 321 through the second upper communication passage 34, and is further adjacent to the windward side. It flows down the flow path row group 22b. On the other hand, the remaining refrigerant rising in the leeward side flow channel array group 210 is influenced by the flow resistance at the throttle plate 31b and decreases the inertial force. Therefore, the flow rate is reduced and the air flows through the first upper side passage 33. Enter the upper upper tank 321. In this way, the refrigerant once splits, and the flow that has passed through the second upper communication passage 34 and the flow that has passed through the first upper communication passage 33 merge in the upwind upper tank 321. . In other words, the refrigerant tends to flow to the first upper communication path 33 and the refrigerant that flows to the second upper communication path 34 by the action of the second upper communication path 34 and the throttle plate 31b. The refrigerant flows up and down the leeward side flow channel array group 210 in the form of being divided into the refrigerant, and the flow rate of the refrigerant to be divided is determined.

  Then, the merged refrigerant descends in the adjacent windward side flow channel group 22b, makes a U-turn in the windward lower side tank 42 and rises in the leeward side flow channel group 22a. It enters the side part and flows out from the outlet 52 to the outside.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the above embodiment, an evaporator having a throttle plate in a tank is described, but the throttle plate is not an essential component of the present invention.

  Moreover, although the said embodiment demonstrated the form which comprises the core part and the flow path row | line group which is located in a line with the air flow direction (Z direction) is two flow path row | line groups, It is limited to this. The flow path row group may be composed of three or more rows.

  Moreover, the core part in the said embodiment may be a core part provided with the core part which does not provide an outer fin between tubes, or the projection part cut and raised from the member which forms a tube between tubes. When the core part is a finless type that does not include fins between tubes, or the core part is a type that includes fins that are joined to only one tube between adjacent tubes. Since the drainage performance of the condensed water condensed on the outer surface of the core part is very good, accurate temperature detection of the core part is easy, and good responsiveness is obtained and useful.

  In the above embodiment, R134a is adopted as the refrigerant. However, the refrigerant is not limited to this, and the same effect can be obtained even when other refrigerants such as a carbon dioxide refrigerant and an R152 refrigerant are adopted. However, the effect is particularly remarkable when the R134a refrigerant is used.

  Moreover, although the example which used the evaporator for the refrigerating cycle of the vehicle air conditioner was demonstrated in the said embodiment, this invention is applied even if it is a heat exchanger used for refrigerating cycles other than a vehicle air conditioner. It goes without saying that you can do it.

  In the above embodiment, the windward header tank and the leeward header tank are described so as to distribute and collect the refrigerant in the plurality of tubes connected to the respective header tanks. The part where the refrigerant is distributed and collected is not limited to this. For example, a configuration may be employed in which the portion where the refrigerant is distributed or collected is collected not on the inside of the tank but on the upstream side of the tank, or on the downstream side of the tank.

  Further, the thickness dimension of the windward flow path group 22 may be larger than the thickness dimension of the leeward flow path group 21 in the air flow direction. Thereby, since the cross-sectional area of the flow channel on the leeward side where the dryness becomes larger is increased, the pressure loss of the refrigerant as the entire heat exchanger can be reduced.

DESCRIPTION OF SYMBOLS 11 ... Downward header tank 12 ... Upstream header tank 20, 20a, 20b ... Tube 21 ... Downward flow path line group 21a, 22a ... Upflow flow line group 21b, 22b ... Down flow line line group 22 ... Upwind flow Road line group 31 ... leeward side upper tank 31a, 41a, 31c ... separator (leeward side partition wall)
31b ... Drawing plate (drawing part, partition wall)
32 ... Upward tank 32a, 42a ... Separator (upward partition wall)
33 ... 1st upper side communication path (1st communication path)
34 ... 2nd upper side communication path (2nd communication path, upper side communication path)
41 ... leeward lower tank 41b ... throttle plate (throttle part, partition wall)
42: Windward lower tank 43 ... First lower communication path (first communication path)
44 ... 2nd lower side communication path (2nd communication path, lower side communication path)
51. Inlet (refrigerant inlet)
52 ... Outlet (refrigerant outlet)
100 ... core part 210 ... leeward side flow path group (upward flow line group) at the farthest part
211 ... The leeward side flow channel group (downward flow channel group) at the farthest part
220 ... windward channel group (upward channel group) at the farthest part
221... Windward flow path row group at the farthest part (downflow flow path row group)
311 ... Downward side upper tank (leeward side header tank)
321 ... Upward upper tank (upward header tank)
411 ... leeward lower tank (leeward header tank)
421 ... Upward lower tank (upward header tank)

Claims (8)

A plurality of tubes (20a) extending in the vertical direction are arranged in the horizontal direction, and a single flow path group consisting of a plurality of passages through which the refrigerant flows is arranged on the downstream side of the air that exchanges heat with the refrigerant. A plurality of leeward side flow channel groups (21) and a plurality of tubes (20b) extending in the vertical direction are formed side by side to form a single flow channel group consisting of a plurality of passages through which refrigerant flows. A core portion (100) having a plurality of windward flow channel groups (22) arranged side by side on the upstream side of the air from the leeward flow channel group (21),
A leeward upper tank (31) connected to the upper end of the leeward flow channel group (21) and a leeward lower tank (41) connected to the lower end of the leeward flow channel group (21); A leeward header tank (11) formed to distribute and collect refrigerant in the plurality of tubes (20a) of the leeward flow path row group (21);
The windward upper tank (32) connected to the upper end of the windward flow channel group (22) and the windward lower tank (42) connected to the lower end of the windward flow channel group (22), An upwind header tank (12) formed to distribute and collect the refrigerant in the plurality of tubes (20b) of the upwind flow path group (22);
A refrigerant inlet (51) provided on one side in the lateral direction so as to communicate with the inside of the leeward header tank (11) in order to introduce the refrigerant into the leeward flow path row group (21);
A refrigerant outlet portion (52) provided on one side in the lateral direction so as to communicate with the inside of the windward header tank (12) for introducing the refrigerant into the windward flow path row group (22);
In the leeward channel group (21), an ascending channel group (21a, 210) in which the refrigerant flow becomes an ascending flow and a descending channel column group (21b) in which the refrigerant flow becomes a descending flow are adjacent to each other. A leeward partition wall (31a, 41a) for partitioning the leeward header tank (11) so as to be formed and reversing the upward flow and the downward flow;
In the upwind flow path line group (22), the ascending flow path line group (22a, 220) in which the refrigerant flow becomes an upflow and the downflow path line group (22b) in which the refrigerant flow becomes a downflow are adjacent to each other. A windward partition wall (32a, 42a) for partitioning the windward header tank (12) so that the upward flow and the downward flow are reversed;
With
The leeward side flow channel group (210) located at the furthest part from the refrigerant inlet part (51) and the windward flow line group (220) located at the furthest part from the refrigerant outlet part (52) lateral Ri is Do different length, and wherein the refrigerant is a flow path array group flowing in the same direction,
A communication path provided on the other side in the horizontal direction with respect to one side in the horizontal direction in which the refrigerant inlet portion (51) and the refrigerant outlet portion (52) are provided, and from the refrigerant inlet portion (51) The inside of the leeward header tank (411, 311) connected to the leeward flow path row group (210) located at the farthest part and the windward flow located at the furthest part from the refrigerant outlet part (52). A first communication path (43, 33) that communicates with the inside of the windward header tank (421, 321) connected to the road line group (220);
Furthermore, at the part farthest from the refrigerant inlet part (51) or the refrigerant outlet part (52), the leeward side to which the channel group (220, 210) having the longer lateral length is connected or A channel row group (next to the horizontal direction with respect to the inside of the upwind header tank (421, 411) and the flow channel row group (210, 220) having a shorter horizontal length) 21b, 22b) has a second communication path (44, 34) communicating with the inside of the upwind or leeward header tank (411, 421) to which is connected,
The refrigerant flowing into the leeward header tank (411, 311) to which the second communication path (44, 34) is connected flows through the first communication path (43, 33) and the first The evaporator is divided into a flow passing through two communication passages (44, 34) and flows into the windward header tanks (421, 321), respectively.   In the leeward header tank (411) to which the second communication path (44) is connected, after a part of the refrigerant is diverted to the second communication path (44), the first 2. The evaporator according to claim 1, further comprising a throttle portion (41 b) that restricts a cross-sectional area of the refrigerant in a portion where the remaining refrigerant flows toward the communication passage (43).   A throttle portion (31b) for reducing the cross-sectional area of the passage inside the leeward header tank (311) to which the second communication passage (34) is connected is provided in the lateral direction with the second communication passage (34) and the The evaporator according to claim 1, wherein the evaporator is provided between the first communication path (33) and the first communication path (33).   4. The evaporator according to claim 2, wherein the throttle portion includes partition walls (41 b, 31 b) in which through holes are formed. 5. The windward flow path group (220) located at the farthest part from the refrigerant outlet part (52) is more than the leeward flow line group (210) located at the furthest part from the refrigerant inlet part (51). The flow path row group having a long lateral length,
The second communication path (44) is arranged inside the windward header tank (421) to which the windward flow path group (220) located at the farthest part in the longer lateral direction is connected. And the channel group (21b) located next to the lateral direction is connected to the leeward channel group (210) in the farthest part of the shorter lateral length. The evaporator according to any one of claims 1 to 4, wherein the evaporator communicates with the inside of the leeward header tank (411). The leeward flow path row group (210) located at the farthest part from the refrigerant inlet part (51) is more than the windward flow line group (220) located at the furthest part from the refrigerant outlet part (52). The flow path row group having a long lateral length,
The second communication passage (34) is arranged inside the leeward header tank (311) to which the leeward flow path row group (210) in the farthest part of the longer lateral direction is connected. And the flow channel group (22b) positioned next to the horizontal direction is connected to the windward flow channel group (220) in the farthest part of the shorter lateral length. The evaporator according to any one of claims 1 to 4, wherein the evaporator communicates with the inside of the windward header tank (321).   The said 2nd communicating path (44) is a lower side communicating path which connects the inside of the said leeward side lower tank (411), and the inside of the said leeward side lower tank (421). The evaporator according to claim 6.   The said 2nd communicating path (34) is an upper side communicating path which connects the inside of the said leeward side upper tank (311), and the inside of the said leeward side upper tank (321). The evaporator according to claim 6.

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