JP2014228233A - Refrigerant evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant evaporator capable of improving distributivity of a liquid-phase refrigerant.SOLUTION: A refrigerant evaporator 1 is configured by connecting a first refrigerant collecting portion 23a formed inside of a second leeward-side tank portion 23 and a second refrigerant distributing portion 13b formed inside of a second windward-side tank portion 13, and connecting a second refrigerant collecting portion 23b formed inside of the second leeward-side tank portion 23 and a first refrigerant distributing portion 13a formed inside of the second windward-side tank portion 13, to replace a refrigerant flowing direction in the core width direction of heat exchange core portions 11 and 21. A first communication hole 241 is formed on a first partitioning member 24 disposed in a first leeward-side tank portion 22, a second communication hole 141 is formed on a second partitioning member 14 disposed in a first windward-side tank portion 12, and the first communication hole 241 and the second communication hole 141 are asymmetrically disposed with respect to a virtual line passing through the center between the first leeward-side tank portion 22 and the first windward-side tank portion 12, and orthogonal to the flowing direction of the distributed air.

Description

  The present invention relates to a refrigerant evaporator that cools a fluid to be cooled by absorbing heat from the fluid to be cooled and evaporating the refrigerant.

  The refrigerant evaporator functions as a cooling heat exchanger that cools the fluid to be cooled by absorbing heat from the fluid to be cooled (for example, air) flowing outside and evaporating the refrigerant (liquid phase refrigerant) flowing inside. .

  As this type of refrigerant evaporator, the first and second evaporation parts including a heat exchange core part formed by laminating a plurality of tubes and a pair of tank parts connected to both ends of the plurality of tubes are covered. A configuration is known in which the tanks are arranged in series in the flow direction of the cooling fluid, and one tank unit in each evaporation unit is connected via a pair of communication units (see, for example, Patent Document 1).

  In the refrigerant evaporator of Patent Document 1, the refrigerant that has flowed through the heat exchange core portion of the first evaporation portion is secondly passed through one tank portion of each evaporation portion and a pair of communication portions that connect the tank portions. When flowing through the heat exchange core part of the evaporation part, the refrigerant flow is changed in the width direction (left-right direction) of the heat exchange core part. That is, in the refrigerant evaporator, the refrigerant flowing on one side in the width direction of the heat exchange core portion of the first evaporation portion is caused to flow in the width direction of the heat exchange core portion of the second evaporation portion by one of the pair of communication portions. The refrigerant is caused to flow to the other side, and the refrigerant flowing on the other side in the width direction of the heat exchange core part of the first evaporation part is caused to flow to one side in the width direction of the heat exchange core part of the second evaporation part. Yes.

  Here, in the refrigerant evaporator 1 described in Patent Document 1, a partition plate is provided for partitioning the inside of the upper tank portion of the windward evaporator disposed in the upstream side in the flow direction of the fluid to be cooled in the vertical direction. By forming the through hole in the partition plate, the refrigerant distribution property is improved in the heat exchange core part of the second evaporation part.

Japanese Patent No. 4625687

  However, in the refrigerant evaporator described in Patent Document 1, the refrigerant flows in from the end in the longitudinal direction (tube stacking direction) of the tank portion in the leeward evaporation portion arranged on the downstream side in the flow direction of the fluid to be cooled. Therefore, in the heat exchange core part of the leeward evaporation part, the inertial force of the refrigerant that has flowed in, gravity, the back pressure of the tube of the windward evaporation part, and the distribution of the fluid to be cooled in the heat exchange core part of the windward evaporation part Due to the influence, the refrigerant distribution becomes non-uniform.

  For example, when the flow rate of refrigerant circulating in the refrigeration cycle is high and the flow rate of refrigerant is high, the flow rate of the refrigerant increases, so that due to the inertia of the refrigerant, the refrigerant hardly flows into the tube near the refrigerant introduction unit. Easy to flow to the far side. On the other hand, when the flow rate of the refrigerant circulating through the refrigeration cycle is low, the flow rate of the refrigerant is slow, so it is easily affected by gravity, and it is difficult for the refrigerant to flow into the tube far from the refrigerant introduction unit. Easy to flow to the near side.

  Therefore, in the refrigerant evaporator described in Patent Document 1, a refrigerant distribution bias occurs in the heat exchange core of the leeward evaporation unit due to the flow rate variation of the refrigerant, and the refrigerant supply amount to the two heat exchange cores of the leeward evaporation unit However, there is a problem that the refrigerant distribution is deteriorated because of the bias.

  An object of this invention is to provide the refrigerant evaporator which can improve the distribution of a liquid phase refrigerant in view of the said point.

  In order to achieve the above object, according to the first aspect of the present invention, in the refrigerant evaporator that performs heat exchange between the fluid to be cooled flowing outside and the refrigerant, the refrigerant evaporator is arranged in series with respect to the flow direction of the fluid to be cooled. The first evaporator (20) and the second evaporator (10) are provided, and each of the first evaporator (20) and the second evaporator (10) includes a plurality of tubes (111, 211) through which refrigerant flows. A pair of heat exchange core parts (11, 21) configured as described above and a pair of refrigerants that are connected to both ends of the plurality of tubes (111, 211) and collect or distribute the refrigerant flowing through the plurality of tubes (111, 211) The heat exchange core part (21) in the first evaporation part (20) is constituted by a part of the tube group among the plurality of tubes (211). The first core portion (21a) And the second core part (21b) composed of the remaining tube group, and the heat exchange core part (11) in the second evaporation part (10) is the fluid to be cooled among the plurality of tubes (111). A third core part (11a) composed of a tube group facing at least a part of the first core part (21a) in the flow direction, and at least a part of the second core part (21b) in the flow direction of the fluid to be cooled. Among the pair of tank parts (22, 23) in the first evaporation part (20), one tank part (23) has a fourth core part (11b) composed of a tube group opposed to the first evaporation part (20). A first refrigerant collecting part (23a) for collecting refrigerant from the first core part (21a) and a second refrigerant collecting part (23b) for collecting refrigerant from the second core part (21b); A pair of tongues in the evaporation section (10) Among the parts (12, 13), one tank part (13) distributes the refrigerant to the first core distribution part (13a) and the fourth core part (11b) for distributing the refrigerant to the third core part (11a). The first evaporator (20) and the second evaporator (10) are configured to include the second refrigerant distributor (13b) that causes the refrigerant in the first refrigerant assembly (23a) to pass through the second refrigerant distributor (13b). ) Having first communication portions (31a, 32b, 33a) and second communication portions (31b, 32a, 33b) for guiding the refrigerant of the second refrigerant assembly portion (23b) to the first refrigerant distribution portion (13a). It connects via the refrigerant | coolant replacement | exchange part (30), The other tank part (22) is connected to the other tank part (22) among a pair of tank parts (22, 23) in a 1st evaporation part (20). ) In the tank in the longitudinal direction of the tube (211). A first partition member (24) for partitioning the inner space (221) and the second tank inner space (222) is provided, and the first partition member (24) includes a first tank inner space (221) and a second tank inner space (221). A first communication hole (241) for communicating with the second tank internal space (222) is provided, and the other tank part (12, 13) of the pair of tank parts (12, 13) in the second evaporation part (10) is provided. 12), the second tank section (12) is divided into a third tank inner space (121) and a fourth tank inner space (122) in the longitudinal direction of the tube (111). The partition member (14) is provided, and the second partition member (14) has a second communication hole (141) for communicating the third tank inner space (121) and the fourth tank inner space (122). The first communication hole (241) and the second communication hole (1 1) passes through the center between the other tank part (22) of the first evaporation part (20) and the other tank part (12) of the second evaporation part (10) and is orthogonal to the flow direction of the fluid to be cooled. It is characterized by being arranged asymmetrically with respect to the imaginary line.

  According to this, the first partition member (24) is provided with the first communication hole (241) for communicating the first tank inner space (221) and the second tank inner space (222), and the second partition member (24) 14) is provided with a second communication hole (141) for communicating the third tank inner space (121) and the fourth tank inner space (122), and the first communication hole (241) and the second communication hole (141). Through a center between the other tank part (22) of the first evaporation part (20) and the other tank part (12) of the second evaporation part (10), and a virtual direction perpendicular to the flow direction of the fluid to be cooled. By arranging asymmetrically with respect to the line, when the refrigerant evaporator is viewed from the flow direction of the fluid to be cooled, the heat exchange core portion (21) and the second evaporation portion (10) in the first evaporation portion (20) In the heat exchange core part (11) in the entire tube (111 It is possible to equalize the pressure loss of 211).

  Therefore, it becomes possible to improve the dispersibility of the liquid-phase refrigerant in the heat exchange core parts (11, 21). For this reason, when the refrigerant | coolant flow rate which flows through a refrigerating cycle is a low flow rate, it can suppress that temperature distribution arises in the ventilation air which passes a refrigerant | coolant evaporator.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a typical perspective view of the refrigerant evaporator concerning a 1st embodiment. It is a disassembled perspective view of the refrigerant evaporator shown in FIG. It is a typical perspective view of the intermediate tank part in an embodiment. It is a disassembled perspective view of the intermediate tank part shown in FIG. It is explanatory drawing for demonstrating the flow of the refrigerant | coolant in the refrigerant evaporator which concerns on 1st Embodiment. In the refrigerant evaporator 1 which concerns on 1st Embodiment, it is explanatory drawing for demonstrating distribution of the liquid phase refrigerant | coolant which flows through each heat exchange core part in case the refrigerant | coolant flow rate circulating through the refrigerating cycle is a low flow rate. In the refrigerant evaporator 1 which concerns on 1st Embodiment, it is explanatory drawing for demonstrating distribution of the liquid phase refrigerant | coolant which flows through each heat exchange core part in case the refrigerant | coolant flow rate which circulates the inside of a refrigerating cycle is a high flow rate. It is explanatory drawing which shows the 1st partition member and 2nd partition member of the refrigerant evaporator which concern on 2nd Embodiment. It is explanatory drawing which shows the 1st partition member and 2nd partition member of the refrigerant evaporator which concern on other embodiment (7). It is explanatory drawing which shows the 1st partition member and 2nd partition member of the refrigerant evaporator which concern on other embodiment (7). It is explanatory drawing which shows the 1st partition member and 2nd partition member of the refrigerant evaporator which concern on other embodiment (8).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The refrigerant evaporator 1 according to the present embodiment is applied to a vapor compression refrigeration cycle of a vehicle air conditioner that adjusts the temperature in the passenger compartment, and absorbs heat from the blown air that is blown into the passenger compartment to form a refrigerant (liquid phase refrigerant). It is a heat exchanger for cooling which cools blowing air by evaporating. In the present embodiment, the blown air corresponds to the “cooled fluid flowing outside” in the claims.

  As is well known, the refrigeration cycle includes a compressor, a radiator (condenser), an expansion valve, and the like (not shown) in addition to the refrigerant evaporator 1, and in this embodiment, liquid is received between the radiator and the expansion valve. It is configured as a receiver cycle in which a device is arranged. The refrigerant of the refrigeration cycle is mixed with refrigeration oil for lubricating the compressor, and a part of the refrigeration oil circulates in the cycle together with the refrigerant.

  Here, in FIG. 2, illustration of the tubes 111 and 211 and the fins 112 and 212 in each heat exchange core part 11 and 21 mentioned later is abbreviate | omitted.

  As shown in FIGS. 1 and 2, the refrigerant evaporator 1 according to the present embodiment includes two evaporators 10 and 20 arranged in series with respect to the flow direction (flow direction of the fluid to be cooled) X of the blown air. It is prepared for. Here, in this embodiment, the evaporation part arrange | positioned among the two evaporation parts 10 and 20 on the windward side (upstream side) of the air flow direction of blowing air is called the windward evaporation part 10, and the flow of blowing air The evaporator disposed on the leeward side (downstream side) in the direction is referred to as a leeward evaporator 20. The upwind evaporator 10 in the present embodiment constitutes the “second evaporator” in the claims, and the downwind evaporator 20 constitutes the “first evaporator” in the claims. Yes.

  The basic configurations of the windward side evaporator 10 and the leeward side evaporator 20 are the same, and the heat exchange core parts 11 and 21 and a pair of tank parts 12 disposed on the upper and lower sides of the heat exchange core parts 11 and 21, respectively. 13, 22, and 23.

  In the present embodiment, the heat exchange core part in the windward evaporator 10 is referred to as the windward heat exchange core part 11, and the heat exchange core part in the leeward evaporator 20 is referred to as the leeward heat exchange core part 21. Of the pair of tank portions 12 and 13 in the windward side evaporation unit 10, the tank portion disposed on the upper side is referred to as a first windward tank portion 12, and the tank portion disposed on the lower side is referred to as the second windward side. This is referred to as a tank portion 13. Similarly, of the pair of tank parts 22 and 23 in the leeward side evaporation part 20, the tank part arranged on the upper side is referred to as the first leeward side tank part 22, and the tank part arranged on the lower side is referred to as the second leeward side. This is referred to as a side tank portion 23.

  Each of the windward side heat exchange core part 11 and the leeward side heat exchange core part 21 of the present embodiment includes a plurality of tubes 111 and 211 extending in the vertical direction and fins 112 and 212 joined between the adjacent tubes 111 and 211. And a laminate in which layers are alternately arranged. Hereinafter, the stacking direction in the stacked body of the plurality of tubes 111 and 211 and the plurality of fins 112 and 212 is referred to as a tube stacking direction, and the longitudinal direction of the tubes 111 and 211 is referred to as a tube longitudinal direction.

  In the present embodiment, the longitudinal directions of the tubes 111 and 211 are parallel to the vertical direction, and the tube stacking direction is parallel to the horizontal direction.

  Here, the windward side heat exchange core part 11 is the 2nd wind comprised by the 1st windward heat exchange core part 11a comprised by some tube groups among the some tubes 111, and the remaining tube group. It has the upper side heat exchange core part 11b. In addition, the 1st windward heat exchange core part 11a in this embodiment comprises the "3rd core part" in a claim, and the 2nd windward heat exchange core part 11b is the "first" in a claim. 4 core part "is comprised.

  In the present embodiment, when the windward heat exchange core part 11 is viewed from the flow direction of the blown air, the first windward heat exchange core part 11a is configured by a tube group existing on the right side of the tube lamination direction, and the tube lamination direction The second upwind heat exchange core portion 11b is configured by a tube group existing on the left side of the above.

  Moreover, the leeward side heat exchange core part 21 is the 2nd leeward side comprised by the 1st leeward side heat exchange core part 21a comprised by some tube groups among the some tubes 211, and the remaining tube group. It has a heat exchange core portion 21b. In addition, the 1st leeward side heat exchange core part 21a in this embodiment comprises the "1st core part" in a claim, and the 2nd leeward side heat exchange core part 21b is the "first" in a claim. 2 core part "is comprised.

  In this embodiment, when the leeward heat exchange core portion 21 is viewed from the flow direction of the blown air, the first leeward heat exchange core portion 21a is configured by a tube group existing on the right side of the tube lamination direction, and the tube lamination direction The second leeward heat exchange core portion 21b is configured by a tube group existing on the left side of the leeward side. In the present embodiment, the first windward side heat exchange core portion 11a and the first leeward side heat exchange core portion 21a are arranged so as to overlap (opposite) when viewed from the flow direction of the blown air. The second leeward side heat exchange core part 11b and the second leeward side heat exchange core part 21b are arranged so as to overlap (oppose) each other.

  Each of the tubes 111 and 211 includes a flat tube in which a refrigerant passage through which a refrigerant flows is formed and a cross-sectional shape thereof is a flat shape extending along the flow direction of the blown air.

  The tube 111 of the windward side heat exchange core part 11 has one end side (upper end side) in the longitudinal direction connected to the first windward tank part 12, and the other end side (lower end side) in the longitudinal direction is the second windward side. It is connected to the tank unit 13. The tube 211 of the leeward heat exchange core portion 21 has one end side (upper end side) in the longitudinal direction connected to the first leeward tank portion 22 and the other end side (lower end side) in the longitudinal direction is second. The leeward tank unit 23 is connected.

  Each of the fins 112 and 212 is a corrugated fin formed by bending a thin plate material into a wave, joined to the flat outer surface side of the tubes 111 and 211, and heat for expanding the heat transfer area between the blown air and the refrigerant. It constitutes an exchange promoting means.

  In the laminated body of the tubes 111 and 211 and the fins 112 and 212, side plates 113 and 213 that reinforce the heat exchange core parts 11 and 12 are arranged at both ends in the tube lamination direction. The side plates 113 and 213 are joined to the fins 112 and 212 arranged on the outermost side in the tube stacking direction.

  The first leeward tank unit 22 is closed at one end, and has a cylinder formed with a refrigerant introduction unit 22a for introducing low-pressure refrigerant decompressed by an expansion valve (not shown) into the tank at the other end. It is comprised by the shape-shaped member. The first leeward tank portion 22 has a through hole (not shown) in which one end side (upper end side) of each tube 211 is inserted and joined at the bottom. That is, the 1st leeward side tank part 22 is comprised so that the internal space may connect with each tube 211 of the leeward side heat exchange core part 21, and each core part 21a, 21b of the leeward side heat exchange core part 21 is comprised. It functions as a refrigerant distribution unit that distributes the refrigerant.

  Inside the first leeward tank portion 22, a first partition member 24 is disposed at a site opposite to the leeward heat exchange core portion 21 with respect to the longitudinal end portion of the tube 211. By the first partition member 231, the tank internal space is divided into two parts, a first tank internal space 221 and a second tank internal space 222 in the tube longitudinal direction. In the present embodiment, the first partition member 24 is disposed at the center position in the tube longitudinal direction inside the first leeward tank portion 22.

  The first partition member 24 has a plurality of first communication holes 241 through which the first tank internal space 221 and the second tank internal space 222 communicate. In the present embodiment, a total of two first communication holes 241 are provided in the vicinity of both ends of the first partition member 24 in the tube stacking direction.

  Inside the second leeward tank part 23, a partition member 231 is arranged at a central position in the longitudinal direction. By this partition member 231, the tank internal space constitutes the first leeward heat exchange core part 21a. It is partitioned into a space in which the tubes 211 communicate with each other and a space in which the tubes 211 constituting the second leeward heat exchange core portion 21b communicate with each other.

  Here, in the inside of the second leeward side tank part 23, the space communicating with each tube 211 constituting the first leeward side heat exchange core part 21a collects the refrigerant from the first leeward side heat exchange core part 21a. The second refrigerant that constitutes the first refrigerant collecting portion 23a to be communicated and in which the space where the tubes 211 constituting the second leeward heat exchange core portion 21b communicate with each other collects refrigerant from the second leeward heat exchange core portion 21b. The aggregation unit 23b is configured.

  The first upwind tank unit 12 is closed at one end (the left end when viewed from the flow direction of the blown air) and at the other end (the right end when viewed from the flow direction of the blown air). Further, it is constituted by a cylindrical member in which a refrigerant derivation part 12a for deriving the refrigerant from the inside of the tank to the suction side of a compressor (not shown) is formed. The first upwind tank unit 12 has a through hole (not shown) in which one end side (upper end side) of each tube 111 is inserted and joined at the bottom. That is, the first upwind tank unit 12 is configured such that the internal space thereof communicates with each tube 111 of the upwind heat exchange core unit 11, and the core units 11 a and 11 b of the upwind heat exchange core unit 11. It functions as a refrigerant collecting part that collects the refrigerant from.

  A second partition member 14 is disposed inside the first upwind tank section 12 at a portion on the opposite side of the windward heat exchange core section 11 from the longitudinal end portion of the tube 111. The second partition member 14 divides the tank internal space into a third tank internal space 121 and a fourth tank internal space 122 in the longitudinal direction of the tube. In this embodiment, the 2nd partition member 14 is arrange | positioned in the center position of the tube longitudinal direction (up-down direction in FIG. 1) in the inside of the 1st windward side tank part 12. As shown in FIG.

  The second partition member 14 is formed with a plurality of second communication holes 141 that allow the third tank inner space 121 and the fourth tank inner space 122 to communicate with each other. In the present embodiment, three second communication holes 141 are provided near the center of the second partition member 14 in the tube stacking direction. Further, the second through hole 141 is formed to have a larger hole diameter than the first through hole 241.

  At this time, the first communication hole 241 and the second communication hole 141 pass through the center between the first leeward tank portion 22 and the first leeward tank portion 12 and are imaginary lines L orthogonal to the flow direction X of the blown air. Are arranged asymmetrically. In more detail, the 1st communicating hole 241 and the 2nd communicating hole 141 are arrange | positioned in the position which is not superposed | polymerized when it sees from the flow direction X of blowing air.

  In the present embodiment, the total area of the plurality of second communication holes 141 provided in the second partition member 14 is greater than the total area of the plurality of first communication holes 241 provided in the first partition member 24. It is getting bigger. Further, the area of each second communication hole 141 is larger than the area of each first communication hole 241.

  The 2nd windward side tank part 13 is comprised with the cylindrical member by which the both end sides were obstruct | occluded. The second upwind tank portion 13 has a through hole (not shown) in which the other end side (lower end side) of each tube 111 is inserted and joined to the ceiling portion. That is, the second upwind tank unit 13 is configured such that its internal space communicates with each tube 111.

  In addition, a partition member 131 is disposed at the center in the longitudinal direction inside the second upwind tank unit 13, and the tank internal space forms the first upwind heat exchange core unit 11a by the partition member 131. Are divided into a space where the tubes 111 communicate with each other and a space where the tubes 111 constituting the second upwind heat exchange core portion 11b communicate with each other.

  Here, in the inside of the second upwind tank unit 13, the space communicating with each tube 111 constituting the first upwind heat exchange core unit 11a distributes the refrigerant to the first upwind heat exchange core unit 11a. A second refrigerant distributor that constitutes the first refrigerant distributor 13a and that communicates with the tubes 111 constituting the second windward heat exchange core 11b distributes the refrigerant to the second windward heat exchange core 11b. 13b is constituted.

  The 2nd leeward side tank part 23 is comprised with the cylindrical member by which the both end sides were obstruct | occluded. The second leeward tank portion 23 has a through hole (not shown) in which the other end side (lower end side) of each tube 211 is inserted and joined to the ceiling portion. That is, the second leeward tank unit 23 is configured such that the internal space thereof communicates with each tube 211.

  Each of the second leeward tank unit 13 and the second leeward tank unit 23 is connected via a refrigerant replacement unit 30. The refrigerant replacement unit 30 guides the refrigerant in the first refrigerant collecting unit 23 a in the second leeward tank unit 23 to the second refrigerant distribution unit 13 b in the second leeward tank unit 13 and also the second leeward tank unit 23. The refrigerant in the second refrigerant collecting portion 23b is guided to the first refrigerant distributing portion 13a in the second upwind tank portion 13. That is, the refrigerant replacement unit 30 is configured to replace the refrigerant flow in the core width direction in each of the heat exchange core units 11 and 21.

  Specifically, the refrigerant replacement part 30 includes a pair of collecting part connecting members 31a and 31b connected to the first and second refrigerant collecting parts 23a and 23b in the second leeward tank part 23, and a second windward tank. A pair of distributor connecting members 32a and 32b connected to the respective refrigerant distributors 13a and 13b in the portion 13, and a pair of intermediate connecting portions connected to the pair of collecting portion connecting members 31a and 31b and the pair of distributing portion connecting members 32a and 32b, respectively. And a tank portion 33.

  Each of the pair of collecting portion connecting members 31a and 31b is configured by a cylindrical member in which a refrigerant flow passage through which a refrigerant flows is formed, and one end side thereof is connected to the second leeward tank portion 23. The other end side is connected to the intermediate tank portion 33.

  The first collecting portion connecting member 31a constituting one of the pair of collecting portion connecting members 31a and 31b is connected to the second leeward tank portion 23 so that one end side thereof communicates with the first refrigerant collecting portion 23a. The other end side is connected to the intermediate tank portion 33 so as to communicate with a first refrigerant flow passage 33a in the intermediate tank portion 33 described later.

  Further, the second collecting portion connecting member 31b constituting the other is connected to the second leeward tank portion 23 so that one end side thereof communicates with the second refrigerant collecting portion 23b, and the other end side is an intermediate tank portion 33 described later. It is connected to the intermediate tank portion 33 so as to communicate with the second refrigerant flow passage 33b.

  In the present embodiment, one end side of the first collecting portion connecting member 31a is connected to a position near the partition member 231 in the first refrigerant collecting portion 23a, and one end side of the second collecting portion connecting member 31b is the second refrigerant set. The part 23b is connected to a position close to the closed end of the second leeward tank part 23.

  Each of the pair of distribution unit connecting members 32a and 32b is formed of a cylindrical member in which a refrigerant flow passage through which a refrigerant flows is formed, and one end side thereof is connected to the second upwind tank unit 13. The other end side is connected to the intermediate tank portion 33.

  Of the pair of distributor connecting members 32a and 32b, the first distributor connecting member 32a constituting one is connected to the second windward tank 13 so that one end side thereof communicates with the first refrigerant distributor 13a. The other end side is connected to the intermediate tank portion 33 so as to communicate with a second refrigerant flow passage 33b in the intermediate tank portion 33 described later. That is, the 1st distribution part connection member 32a is connected with the above-mentioned 2nd gathering part connection member 31b via the 2nd refrigerant flow passage 33b of intermediate tank part 33.

  Further, the second distribution portion connecting member 32b constituting the other is connected to the second windward tank portion 13 so that one end side communicates with the second refrigerant distribution portion 13b, and the other end side is an intermediate tank portion 33 described later. It is connected to the intermediate tank portion 33 so as to communicate with the first refrigerant flow passage 33a. In other words, the second distribution part connecting member 32 b communicates with the first collecting part connecting member 31 a described above via the first refrigerant flow passage 33 a of the intermediate tank part 33.

  In the present embodiment, one end side of the first distribution unit connecting member 32a is connected to a position near the closed end of the second upwind tank unit 13 in the first refrigerant distribution unit 13a, and the second distribution unit connecting member 32b One end side is connected to a position near the partition member 131 in the second refrigerant distribution portion 13b.

  Each of the pair of collecting portion connecting members 31 a and 31 b configured as described above constitutes a refrigerant inlet in the refrigerant replacement portion 30, and each of the pair of distribution portion connecting members 32 a and 32 b is the refrigerant in the refrigerant replacement portion 30. It constitutes an outlet.

  The intermediate tank portion 33 is configured by a cylindrical member whose both ends are closed. The intermediate tank portion 33 is disposed between the second leeward tank portion 13 and the second leeward tank portion 23. Specifically, when viewed from the flow direction X of the blown air, the intermediate tank portion 33 of the present embodiment has a part (upper side portion) of the second windward side tank portion 13 and the second leeward side. It arrange | positions so that it may superimpose with the tank part 23 and the other part (lower site | part) may not superimpose with the 2nd leeward side tank part 13 and the 2nd leeward side tank part 23. FIG.

  Thus, if it is set as the structure arrange | positioned so that a part of intermediate | middle tank part 33 may not superimpose with the 2nd windward side tank part 13 and the 2nd leeward side tank part 23, in the flow direction X of blowing air, the windward side Since the evaporator 10 and the leeward evaporator 20 can be arranged close to each other, an increase in the size of the refrigerant evaporator 1 due to the provision of the intermediate tank 33 can be suppressed.

  As shown in FIGS. 3 and 4, a partition member 331 is disposed inside the intermediate tank portion 33 at a position located on the upper side, and the partition member 331 allows the space inside the tank to flow through the first refrigerant. It is partitioned into a passage 33a and a second refrigerant flow passage 33b.

  The 1st refrigerant | coolant flow path 33a comprises the refrigerant | coolant flow path which guide | induces the refrigerant | coolant from the 1st gathering part connection member 31a to the 2nd distribution part connection member 32b. On the other hand, the second refrigerant flow passage 33b constitutes a refrigerant flow passage that guides the refrigerant from the second collecting portion connecting member 31b to the first distribution portion connecting member 32a.

  Here, in this embodiment, the 1st refrigerant | coolant flow path 33a in the 1st gathering part connection member 31a, the 2nd distribution part connection member 32b, and the intermediate tank part 33 is "the 1st communication part" as described in a claim. Is configured. Moreover, the 2nd refrigerant | coolant flow path 33b in the 2nd gathering part connection member 31b, the 1st distribution part connection member 32a, and the intermediate | middle tank part 33 comprises the "2nd communication part" as described in a claim.

  Next, the flow of the refrigerant in the refrigerant evaporator 1 according to this embodiment will be described with reference to FIG.

  As shown in FIG. 5, the low-pressure refrigerant decompressed by an expansion valve (not shown) is introduced into the tank from a refrigerant introduction part 22a formed on one end side of the first leeward tank part 22 as indicated by an arrow A. The first partition member 14 passes through the first communication hole 141. The refrigerant introduced into the first leeward tank portion 22 descends the first leeward heat exchange core portion 21a of the leeward heat exchange core portion 21 as indicated by an arrow B. In addition, the refrigerant that has passed through the through hole 241 of the damming plate 24 descends the second leeward heat exchange core portion 21b of the leeward heat exchange core portion 21 as indicated by an arrow C.

  The refrigerant descending the first leeward heat exchange core portion 21a flows into the first refrigerant collecting portion 23a of the second leeward tank portion 23 as indicated by an arrow D. On the other hand, the refrigerant descending the second leeward heat exchange core portion 21b flows into the second refrigerant collecting portion 23b of the second leeward tank portion 23 as indicated by an arrow E.

  The refrigerant flowing into the first refrigerant collecting portion 23a flows into the first refrigerant flow passage 33a of the intermediate tank portion 33 through the first collecting portion connecting member 31a as indicated by the arrow F. Further, the refrigerant flowing into the second refrigerant collecting portion 23b flows into the second refrigerant flow passage 33b of the intermediate tank portion 33 through the second collecting portion connecting member 31b as indicated by an arrow G.

  The refrigerant flowing into the first refrigerant flow passage 33a flows into the second refrigerant distribution portion 13b of the second upwind tank portion 13 through the second distribution portion connecting member 32b as indicated by an arrow H. Further, the refrigerant flowing into the second refrigerant flow passage 33b flows into the first refrigerant distribution portion 13a of the second upwind tank portion 13 through the first distribution portion connecting member 32a as indicated by an arrow I.

  The refrigerant that has flowed into the second refrigerant distribution unit 13b of the second upwind tank unit 13 moves up the second upwind heat exchange core unit 11b of the upwind heat exchange core unit 11 as indicated by an arrow J. On the other hand, the refrigerant that has flowed into the first refrigerant distribution portion 13a rises in the first windward heat exchange core portion 11a of the windward heat exchange core portion 11 as indicated by an arrow K.

  The refrigerant that has risen up the second upwind heat exchange core portion 11b and the refrigerant that has risen up the first upwind heat exchange core portion 11a flow into the tank of the first upwind tank portion 12 as indicated by arrows L and M, respectively. As shown by an arrow N, the refrigerant passes through the second communication hole 141 of the second partition member 14 and is led out to the compressor (not shown) suction side from a refrigerant lead-out portion 12a formed on one end side of the first upwind tank portion 12. The

  In the refrigerant evaporator 1 according to the present embodiment described above, the first communication hole 241 is provided in the first partition member 24, the second communication hole 141 is provided in the second partition member 14, and the first communication hole 241 and the second communication hole 241 are provided. The communication hole 141 is disposed asymmetrically with respect to a virtual line L that passes through the center between the first leeward tank portion 22 and the first leeward tank portion 12 and is orthogonal to the flow direction X of the blown air.

  Here, if the 2nd communicating hole 141 is provided in the 2nd partition member 14, the tube arrange | positioned in the 2nd communicating hole 141 vicinity in the some tube 111 of the windward heat exchange core part 11 (henceforth, windward center tube 111). And a tube (hereinafter referred to as the leeward side central tube) arranged at a position overlapping with the windward side central tube 111 when viewed from the flow direction X of the blast air among the plurality of tubes 211 of the leeward side heat exchange core portion 21. 211)).

  At this time, since the pressure loss of the leeward side central tube 211 is reduced in the leeward side heat exchange core part 21, the back pressure is different in each tube 211. For this reason, in the leeward side heat exchange core part 21, a liquid phase refrigerant | coolant becomes easy to flow through the center part of a tube lamination direction, and it will be in the state which a liquid phase refrigerant does not flow easily into the both ends of a tube lamination direction.

  On the other hand, in the present embodiment, the first partitioning member 24 is provided with the first communication hole 241, and the first communication hole 241 is further connected to the first leeward tank unit 22 and the first windward tank unit 12. They are arranged asymmetrically with respect to an imaginary line L passing through the center between them and orthogonal to the flow direction X of the blown air. Specifically, the first communication hole 241 is disposed at a position where it does not overlap with the second communication hole 141 when viewed from the flow direction X of the blown air.

  For this reason, a tube (hereinafter referred to as the leeward side end tube 211) disposed in the vicinity of the first communication hole 241 in the plurality of tubes 211 of the leeward side heat exchange core part 21, and a plurality of the windward side heat exchange core part 11. The pressure loss of a tube (hereinafter referred to as the windward side end tube 111) arranged at a position overlapping with the leeward side end tube 211 when viewed from the flow direction X of the blown air is reduced.

  Therefore, when the refrigerant evaporator 1 is viewed from the flow direction X of the blown air, the pressure loss of the tubes 111 and 211 in the entire region of the leeward side heat exchange core portion 21 and the windward side heat exchange core portion 11 that overlap is uniform. Can be Thereby, it becomes possible to improve the distribution property of the liquid-phase refrigerant in the heat exchange core parts 11 and 21. For this reason, it can suppress that temperature distribution arises in the ventilation air which passes through the refrigerant | coolant evaporator 1. FIG.

  Here, FIGS. 6 and 7 are explanatory views for explaining the distribution of the liquid-phase refrigerant flowing through the heat exchange core portions 11 and 21 of the refrigerant evaporator 1 according to the present embodiment, and FIG. 6 is a refrigeration cycle. FIG. 7 shows a case where the refrigerant circulating in the refrigerant has a low flow rate, and FIG. 7 shows a case where the refrigerant circulating in the refrigeration cycle has a high flow rate.

  6 (a) and 7 (a) show the distribution of the liquid refrigerant flowing through the leeward heat exchange core part 21, and FIGS. 6 (b) and 7 (b) show the windward heat exchange core part 11. The distribution of the liquid phase refrigerant | coolant which flows through is shown.

  6 and 7 show the distribution of the liquid-phase refrigerant when the refrigerant evaporator 1 is viewed from the direction of the arrow Y in FIG. 1 (the direction opposite to the flow direction Y of the blown air). A portion indicated by a portion indicates a portion where the liquid-phase refrigerant exists. Moreover, the broken line in FIG. 6 and FIG. 7 is in the refrigerant evaporator 1 (the refrigerant evaporator in which the 1st partition member 24 and the 1st communicating hole 241 are not provided in the 1st leeward tank part 22) which concerns on a comparative example. It shows the tip position of the distribution of the liquid phase refrigerant.

  When the flow rate of refrigerant flowing through the refrigeration cycle is low, in the refrigerant evaporator 1 according to the comparative example, the liquid-phase refrigerant that has flowed into the first leeward tank unit 22 from the refrigerant introduction unit 22a is easily affected by gravity. For this reason, as shown by the broken line in FIG. 6A, the refrigerant easily flows into the tube 211 on the side close to the refrigerant introduction portion 22a, and the refrigerant is difficult to flow to the side far from the refrigerant introduction portion 22a. On the other hand, in the refrigerant evaporator 1 according to the present embodiment, as shown by the hatched portion in FIG. 6A, the refrigerant easily flows to the side far from the refrigerant introduction portion 22a.

  Further, in the refrigerant evaporator 1 according to the comparative example, since the refrigerant easily flows into the tube 211 on the side close to the refrigerant introduction part 22a in the leeward heat exchange core part 21, in the windward heat exchange core part 11, FIG. As shown by the broken line in b), the flow rate of the liquid-phase refrigerant is smaller in the first windward heat exchange core part 11a than in the second windward heat exchange core part 11b. On the other hand, in the refrigerant evaporator 1 according to the present embodiment, as shown by the hatched portion in FIG. 6 (b), the liquid between the first upwind heat exchange core portion 11a and the second upwind heat exchange core portion 11b. The flow rate of the phase refrigerant becomes more uniform.

  When the flow rate of the refrigerant flowing through the refrigeration cycle is high, in the refrigerant evaporator 1 according to the comparative example, the liquid-phase refrigerant that has flowed into the first leeward tank unit 22 from the refrigerant introduction unit 22a is generated by the inertia force and the refrigerant introduction unit 22a It becomes easy to flow to the side far from. For this reason, as shown by the broken line in FIG. 7A, the refrigerant hardly flows to the side closer to the refrigerant introduction part 22a, and the refrigerant easily flows into the tube 211 far from the refrigerant introduction part 22a.

  On the other hand, in the refrigerant evaporator 1 according to this embodiment, as shown by the hatched portion in FIG. 7A, the refrigerant easily flows to the side closer to the refrigerant introduction portion 22a.

  Further, in the refrigerant evaporator 1 according to the comparative example, the refrigerant easily flows into the tube 211 far from the refrigerant introduction part 22a in the leeward heat exchange core part 21, and therefore, in the windward heat exchange core part 11, FIG. As shown by the broken line in b), the flow rate of the liquid-phase refrigerant is larger in the first windward heat exchange core part 11a than in the second windward heat exchange core part 11b.

  On the other hand, in the refrigerant evaporator 1 according to the present embodiment, as shown by the hatched portion in FIG. 7 (b), the liquid between the first upwind heat exchange core portion 11a and the second upwind heat exchange core portion 11b. The flow rate of the phase refrigerant becomes more uniform.

  By the way, the refrigerant expands and the volume increases as the refrigerant flows toward the downstream side. Therefore, as in this embodiment, the total area of the plurality of second communication holes 141 provided in the second partition member 14 is the total of the plurality of first communication holes 241 provided in the first partition member 24. By making it larger than the area, the refrigerant easily flows into the second communication hole 141 even when the refrigerant expands.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in the configuration of the first communication hole 141 and the second communication hole 241.

  As shown in FIG. 8, some first communication holes 241 a among the plurality of first communication holes 241 are arranged at positions where they overlap with each other when viewed from the second communication hole 141 and the flow direction X of the blown air. ing. Further, the remaining first communication hole 241b among the plurality of first communication holes 241 is disposed at a position where the second communication hole 141 and the blown air flow direction X are non-polymerized.

  Among the plurality of second communication holes 141, some of the second communication holes 141a are arranged at positions where they overlap when viewed from the first communication hole 241 and the flow direction X of the blown air. The remaining second communication hole 141b among the plurality of second communication holes 141 is disposed at a position where the first communication hole 241 and the blown air flow direction X are non-polymerized.

  In the present embodiment, the first communication hole 241 and the second communication hole 141 are arranged symmetrically with respect to the center line c in the tube stacking direction of the first partition member 14 and the second partition member 24.

  Specifically, the remaining first communication holes 241 b are arranged one by one at both ends of the first partition member 24 in the tube stacking direction. Further, the part of the first communication holes 241a are arranged one by one so as to be adjacent to the remaining first communication holes 241b.

  The remaining second communication hole 141b is arranged at the center of the second partition member 14 in the tube stacking direction. One part of the second communication holes 141a is arranged on each side of the remaining second communication hole 141b.

  In the present embodiment, the remaining first communication hole 241b among the plurality of first communication holes 241 is arranged at a position where the second communication hole 141 and the blown air flow direction X are non-polymerized. Therefore, it is possible to obtain the same effect as in the first embodiment.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows without departing from the spirit of the present invention.

  (1) In the above-described embodiment, an example in which the refrigerant replacement unit 30 is configured by the pair of collecting unit coupling members 31a and 31b, the pair of distribution unit coupling members 32a and 32b, and the intermediate tank unit 33 has been described. For example, the intermediate tank unit 33 of the refrigerant replacement unit 30 may be eliminated and the connection members 31a, 31b, 32a, and 32b may be directly connected to each other.

  (2) In the above-described embodiment, as the refrigerant evaporator 1, the first windward side heat exchange core portion 11 a and the first leeward side heat exchange core portion 21 a are superposed when viewed from the flow direction of the blown air. Although the example arrange | positioned so that it may arrange | position and the 2nd leeward side heat exchange core part 11b and the 2nd leeward side heat exchange core part 21b superpose | polymerize was demonstrated, it is not restricted to this. The refrigerant evaporator 1 is arranged so that at least a part of the first windward heat exchange core portion 11a and the first leeward heat exchange core portion 21a are polymerized when viewed from the flow direction of the blown air, You may arrange | position so that at least one part of the 2nd leeward side heat exchange core part 11b and the 2nd leeward side heat exchange core part 21b may superpose | polymerize.

  (3) Although it is desirable to arrange the windward evaporator 10 in the refrigerant evaporator 1 on the upstream side in the flow direction X of the blown air as compared with the above-described embodiment, the present invention is not limited to this. You may make it arrange | position the windward evaporation part 10 in the downstream in the flow direction X of blowing air rather than the leeward evaporation part 20. FIG.

  (4) In the above-described embodiment, the example in which each heat exchange core portion 11 and 21 is configured by the plurality of tubes 111 and 211 and the fins 112 and 212 has been described. The heat exchange core parts 11 and 21 may be configured as described above. Moreover, when each heat exchange core part 11 and 21 is comprised with the some tubes 111 and 211 and the fins 112 and 212, the fins 112 and 212 may employ | adopt a plate fin not only a corrugated fin.

  (5) In the above-described embodiment, the example in which the refrigerant evaporator 1 is applied to the refrigeration cycle of the vehicle air conditioner has been described. However, the present invention is not limited to this example. Good.

  (6) In the above-described embodiment, the example in which the first partition member 14 is arranged at the center position in the tube longitudinal direction inside the first upwind tank portion 12 is described. You may arrange | position in the arbitrary positions in the site | part on the opposite side to the windward heat exchange core part 11 rather than a direction edge part.

  In the above-described embodiment, the example in which the second partition member 24 is disposed at the center position in the tube longitudinal direction inside the first leeward tank unit 22 has been described. You may arrange | position in the arbitrary positions in the site | part on the opposite side to the leeward side heat exchange core part 21 rather than an edge part.

  (7) In the first embodiment, as an example in which the first communication hole 241 and the second communication hole 141 are arranged at positions that are not superposed when viewed from the flow direction X of the blown air, the first communication hole 241 is used. Are provided one by one near both ends of the first partition member 24 in the tube stacking direction, and three second communication holes 141 are provided near the center of the second partition member 14 in the tube stacking direction. . However, the configuration of the first communication hole 241 and the second communication hole 141 is not limited to this.

  For example, as shown in FIG. 9, three first communication holes 241 are provided in the vicinity of both ends of the first partition member 24 in the tube stacking direction, and the second communication holes 141 are tubes in the second partition member 14. You may provide three near the center part of the lamination direction. At this time, the first communication hole 241 and the second communication hole 141 are arranged symmetrically with respect to the center line c of the first partition member 14 and the second partition member 24 in the tube stacking direction.

  Also, as shown in FIG. 10, the second communication hole 141 is provided at the end of the second partitioning member 14 on the side far from the refrigerant outlet 12a in the tube stacking direction, and the first communication hole 241 is provided for the flow of blown air. A plurality of them may be provided at equal intervals in positions where they are not superposed with the second communication hole 141 when viewed from the direction X.

  (8) In the second embodiment, a part of the plurality of first communication holes 241 is superposed when viewed from the second communication hole 141 and the flow direction X of the blown air. And the remaining first communication hole 241b among the plurality of first communication holes 241 is disposed at a position where the second communication hole 141 and the blown air flow direction X are non-polymerized. As described above, the first communication hole 241 and the second communication hole 141 are arranged symmetrically with respect to the center line c in the tube stacking direction of the first partition member 14 and the second partition member 24. However, the configuration of the first communication hole 241 and the second communication hole 141 is not limited to this.

  For example, as shown in FIG. 11, a plurality of first communication holes 241 having different diameters are provided in the entire region of the first partition member 24 in the tube stacking direction, and the second communication holes 141 having different diameters are provided to the second partition member. A plurality may be provided near the center of the tube stacking direction in FIG.

10 Upwind evaporator (second evaporator)
11a 1st upwind heat exchange core part (3rd core part)
11b 2nd windward heat exchange core part (4th core part)
14 2nd partition member 141 2nd communicating hole 20 leeward side evaporation part (1st evaporation part)
21a 1st leeward side heat exchange core part (1st core part)
21b 2nd leeward side heat exchange core part (2nd core part)
24 1st partition member 241 1st communicating hole

Claims (7)

A refrigerant evaporator that exchanges heat between a cooled fluid flowing outside and a refrigerant,
A first evaporator (20) and a second evaporator (10) arranged in series with respect to the flow direction of the fluid to be cooled;
Each of the first evaporator (20) and the second evaporator (10)
A heat exchange core (11, 21) configured by laminating a plurality of tubes (111, 211) through which refrigerant flows;
A pair of tank parts (12, 13, 22, 23) connected to both ends of the plurality of tubes (111, 211) and collecting or distributing refrigerant flowing through the plurality of tubes (111, 211); Have
The heat exchange core part (21) in the first evaporation part (20) includes a first core part (21a) constituted by a part of a tube group among the plurality of tubes (211), and a remaining tube. Having a second core portion (21b) composed of a group;
The heat exchange core part (11) in the second evaporation part (10) includes at least a part of the first core part (21a) in the flow direction of the fluid to be cooled among the plurality of tubes (111). A third core portion (11a) composed of opposing tube groups, and a fourth core portion composed of a tube group facing at least part of the second core portion (21b) in the flow direction of the fluid to be cooled. (11b)
Of the pair of tank parts (22, 23) in the first evaporation part (20), one tank part (23) is a first refrigerant collecting part that collects refrigerant from the first core part (21a). (23a) includes a second refrigerant assembly part (23b) that collects the refrigerant from the second core part (21b),
Of the pair of tank parts (12, 13) in the second evaporation part (10), one tank part (13) is a first refrigerant distribution part that distributes the refrigerant to the third core part (11a). 13a), including a second refrigerant distribution part (13b) for distributing the refrigerant to the fourth core part (11b),
The first evaporation section (20) and the second evaporation section (10) include first communication sections (31a, 32b) that guide the refrigerant of the first refrigerant assembly section (23a) to the second refrigerant distribution section (13b). , 33a) and a refrigerant replacement part (30) having a second communication part (31b, 32a, 33b) for guiding the refrigerant of the second refrigerant assembly part (23b) to the first refrigerant distribution part (13a). Are connected,
Of the pair of tank parts (22, 23) in the first evaporation part (20), the other tank part (22) has the space in the tank of the other tank part (22) as the tube (211). In the longitudinal direction, a first partition member (24) for partitioning into a first tank inner space (221) and a second tank inner space (222) is provided,
The first partition member (24) is provided with a first communication hole (241) for communicating the first tank inner space (221) and the second tank inner space (222).
Of the pair of tank parts (12, 13) in the second evaporation part (10), the other tank part (12) has a space in the tank of the other tank part (12) as the tube (111). ) In the longitudinal direction is provided with a second partition member (14) for partitioning into a third tank inner space (121) and a fourth tank inner space (122),
The second partition member (14) is provided with a second communication hole (141) for communicating the third tank inner space (121) and the fourth tank inner space (122).
The first communication hole (241) and the second communication hole (141) are the other tank part (22) of the first evaporation part (20) and the other tank of the second evaporation part (10). A refrigerant evaporator, wherein the refrigerant evaporator is disposed asymmetrically with respect to a virtual line passing through the center between the parts (12) and perpendicular to the flow direction of the fluid to be cooled.   The total area of the second communication hole (141) provided in the second partition member (14) is the total area of the first communication hole (241) provided in the first partition member (24). The refrigerant evaporator according to claim 1, wherein the refrigerant evaporator is larger. The first communication hole (241) is disposed on the end side in the stacking direction of the tube (211) in the first partition member (24),
The second communication hole (141) is disposed on the center side in the stacking direction of the tube (111) in the second partition member (14),
The refrigerant evaporator according to claim 1, wherein an area of the second communication hole (141) is larger than an area of the first communication hole (241).   The said 1st communicating hole (241) and the said 2nd communicating hole (141) are arrange | positioned in the position which becomes a non-polymerization, when it sees from the flow direction of the said to-be-cooled fluid. The refrigerant evaporator as described. A plurality of the first communication holes (241) and the second communication holes (141) are provided,
Among the plurality of first communication holes (241), some of the first communication holes (241) overlap with the second communication holes (141) when viewed from the flow direction of the fluid to be cooled. Are located in
Of the plurality of first communication holes (241), the remaining first communication hole (241) becomes non-polymerized when viewed from the second communication hole (141) and the flow direction of the fluid to be cooled. The refrigerant evaporator according to claim 1, wherein the refrigerant evaporator is disposed at a position.   Refrigerant introduction for introducing refrigerant into the other tank part (22) at the end of the tube (211) in the stacking direction of the other tank part (22) of the first evaporation part (20). The refrigerant evaporator according to any one of claims 1 to 5, wherein a portion (22a) is provided. A refrigerant evaporator that exchanges heat between a cooled fluid flowing outside and a refrigerant,
A first evaporator (20) and a second evaporator (10) arranged in series with respect to the flow direction of the fluid to be cooled;
Each of the first evaporator (20) and the second evaporator (10)
A heat exchange core (11, 21) configured by laminating a plurality of tubes (111, 211) through which refrigerant flows;
A pair of tank parts (12, 13, 22, 23) connected to both ends of the plurality of tubes (111, 211) and collecting or distributing refrigerant flowing through the plurality of tubes (111, 211); Have
The heat exchange core part (21) in the first evaporation part (20) includes a first core part (21a) constituted by a part of a tube group among the plurality of tubes (211), and a remaining tube. Having a second core portion (21b) composed of a group;
The heat exchange core part (11) in the second evaporation part (10) includes at least a part of the first core part (21a) in the flow direction of the fluid to be cooled among the plurality of tubes (111). A third core portion (11a) composed of opposing tube groups, and a fourth core portion composed of a tube group facing at least part of the second core portion (21b) in the flow direction of the fluid to be cooled. (11b)
Of the pair of tank parts (22, 23) in the first evaporation part (20), one tank part (23) is a first refrigerant collecting part that collects refrigerant from the first core part (21a). (23a) includes a second refrigerant assembly part (23b) that collects the refrigerant from the second core part (21b),
Of the pair of tank parts (12, 13) in the second evaporation part (10), one tank part (13) is a first refrigerant distribution part that distributes the refrigerant to the third core part (11a). 13a), including a second refrigerant distribution part (13b) for distributing the refrigerant to the fourth core part (11b),
The first evaporation section (20) and the second evaporation section (10) include first communication sections (31a, 32b) that guide the refrigerant of the first refrigerant assembly section (23a) to the second refrigerant distribution section (13b). , 33a) and a refrigerant replacement part (30) having a second communication part (31b, 32a, 33b) for guiding the refrigerant of the second refrigerant assembly part (23b) to the first refrigerant distribution part (13a). Are connected,
Of the pair of tank parts (22, 23) in the first evaporation part (20), the other tank part (22) has the space in the tank of the other tank part (22) as the tube (211). In the longitudinal direction, a first partition member (24) for partitioning into a first tank inner space (221) and a second tank inner space (222) is provided,
The first partition member (24) is provided with a first communication hole (241) for communicating the first tank inner space (221) and the second tank inner space (222).
Of the pair of tank parts (12, 13) in the second evaporation part (10), the other tank part (12) has a space in the tank of the other tank part (12) as the tube (111). ) In the longitudinal direction is provided with a second partition member (14) for partitioning into a third tank inner space (121) and a fourth tank inner space (122),
The second partition member (14) is provided with a second communication hole (141) that allows the third tank inner space (121) and the fourth tank inner space (122) to communicate with each other. Refrigerant evaporator.

Images