JP6458617B2 - Refrigerant evaporator - Google Patents

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.

  Conventionally, as a refrigerant evaporator, the first and second evaporators including a heat exchange core unit configured by stacking a plurality of tubes and a pair of tank units connected to both ends of the plurality of tubes are cooled. An arrangement in which one tank portion in each evaporation portion is connected in series via a pair of communicating portions is disclosed (for example, see 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.

Japanese Patent No. 4124136

  By the way, in the refrigerant evaporator of the above-mentioned Patent Document 1, from the introduction part for introducing the liquid phase refrigerant into the distribution side (upper side) tank part of the first evaporation part and the collecting side (upper side) tank part of the second evaporation part. The lead-out portion for leading the refrigerant is arranged on the same side in the width direction (tube stacking direction) of the heat exchange core portion. In the refrigerant evaporator having such a configuration, the following problems may occur when the heat load is small, that is, when the refrigerant flowing through the refrigerant evaporator is small.

  That is, when the refrigerant flow rate is low, the flow rate of the refrigerant flowing from the liquid-phase refrigerant introduction unit in the first evaporation unit is slow. For this reason, a large amount of the liquid phase refrigerant that has flowed into the first evaporation portion flows into the tube located near the introduction portion, and thus the liquid phase refrigerant cannot sufficiently flow through the tube far from the introduction portion. As a result, the liquid refrigerant sufficiently flows on one side in the width direction of the heat exchange core part of the second evaporation part, while only the gas phase refrigerant flows on the other side in the width direction of the heat exchange core part of the second evaporation part. .

  As a result, the liquid-phase refrigerant that could not evaporate out of the refrigerant flowing on one side in the width direction of the heat exchange core part of the second evaporation part is in the upper part on the other side in the width direction of the heat exchange core part in the second evaporation part. When passing through the tank part, there is a possibility that it flows backward to the tube on the other side in the width direction of the heat exchange core part. When such a reverse flow of the liquid-phase refrigerant occurs, the refrigerant flow on the other side in the width direction of the heat exchange core part of the second evaporation part is hindered, and refrigeration oil (the compressor mixed in the refrigerant is lubricated inside the refrigerant evaporator). The problem is that the oil used to stagnate.

  An object of this invention is to provide the refrigerant evaporator which can suppress that refrigeration oil retains inside in view of the said point.

In order to achieve the above object, the invention according to claim 1 includes 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 evaporation section (20) and the second evaporation section (10) includes a heat exchange core section (11, 21) configured by stacking a plurality of tubes (111, 211) through which a refrigerant flows, and a plurality of tubes (111). , 211) and a pair of tank parts (12, 13, 22, 23) for collecting or distributing the refrigerant flowing through the plurality of tubes (111, 211). The heat exchange core part (21) in (20) is at least a part of the first core part (21a) constituted by a part of the tube group among the plurality of tubes (211) and the remaining tube group. Consists of tube groups The heat exchange core part (11) in the second evaporation part (10) has a core part (21b), and the third core part (11a) constituted by a part of the tube group among the plurality of tubes (111). ), And a fourth core portion (11b) composed of at least some of the remaining tube groups, and of the pair of tank portions (22, 23) in the first evaporation unit (20). The one tank part (23) includes a first refrigerant assembly part (23a) that collects refrigerant from the first core part (21a) and a second refrigerant assembly part that collects refrigerant from the second core part (21b). (23b), and one of the pair of tank parts (12, 13) in the second evaporation part (10), one tank part (13) distributes the refrigerant to the third core part (11a). 1st refrigerant distribution part (13a), 4th core part (11b) A second refrigerant distributor (13b) for distributing the refrigerant is included, and the first evaporator (20) and the second evaporator (10) distribute the refrigerant in the first refrigerant assembly (23a) to the second refrigerant. The first communication part (31a) leading to the part (13b) and the second communication part (32a) leading the refrigerant of the second refrigerant assembly part (23b) to the first refrigerant distribution part (13a) In the other tank part (22) of the pair of tank parts (22, 23) of the first evaporation part (20), on the one end side in the stacking direction of the tube (211), the other tank part (22 ) A refrigerant introduction part (22a) for introducing refrigerant into the inside is connected, and the tube in the other tank part (12) of the pair of tank parts (12, 13) of the second evaporation part (10). Same as the refrigerant introduction part (22a) in the stacking direction of (111). A refrigerant derivation part (12a) for deriving a refrigerant from the inside of the other tank part (11b) is connected to one end part, and the first core part (21a) is connected to the second core part ( 21b) is arranged closer to the refrigerant introduction part (22a), and the third core part (11a) is arranged closer to the refrigerant outlet part (12a) than the fourth core part (11b). And a guide part for guiding a part of the refrigerant introduced from the refrigerant introduction part (22a) to the second core part (21b) side in the other tank part (22) of the first evaporation part (20). Among the refrigerant introduced from the refrigerant introduction part (22a), the second core part (21b) is guided to the second core part (21b) side through the guide part (40). The amount of refrigerant flowing into the first core portion (21a) after flowing out from the guide portion (40) Characterized in that more than the amount of refrigerant flowing into the first core portion (21a) flowing in.

  According to this, a guide for guiding a part of the refrigerant introduced from the refrigerant introduction part (22a) to the second core part (21b) side inside the other tank part (22) in the first evaporation part (20). By providing the portion (40), the liquid-phase refrigerant can surely flow into the second core portion (21b) even when the flow rate of refrigerant flowing through the refrigeration cycle is low. Thereby, since a liquid phase refrigerant | coolant can be reliably distribute | circulated to the 3rd core part (11a) of a 2nd evaporation part (10), it is 3rd from the other tank part (12) of a 2nd evaporation part (10). It is possible to prevent the refrigerant from flowing back to the core portion (11a). For this reason, it can suppress that refrigeration oil stagnates inside a refrigerant 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 explanatory drawing for demonstrating the flow of the refrigerant | coolant in the refrigerant evaporator which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow of the liquid phase refrigerant | coolant in the leeward side evaporation part of the refrigerant evaporator which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow of the liquid phase refrigerant | coolant in the windward evaporation part of the refrigerant evaporator which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow of the liquid phase refrigerant | coolant in the leeward side evaporation part of the refrigerant evaporator which concerns on 2nd Embodiment. It is explanatory drawing for demonstrating the flow of the liquid phase refrigerant | coolant in the leeward side evaporation part of the refrigerant evaporator which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the flow of the liquid phase refrigerant | coolant in the leeward side evaporation part of the refrigerant evaporator which concerns on 4th Embodiment. It is explanatory drawing which shows the structure of the refrigerant evaporator which concerns on 5th Embodiment. It is explanatory drawing which shows the structure of the refrigerant evaporator which concerns on 6th Embodiment. It is explanatory drawing which shows the structure of the refrigerant evaporator which concerns 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 according to the present embodiment is applied to a vapor compression refrigeration cycle of a vehicle air conditioner that adjusts the temperature in the vehicle interior, and absorbs heat from the blown air that is blown into the vehicle interior to generate 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.

  As shown in FIGS. 1 and 2, the refrigerant evaporator 1 of 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 flow direction X 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 X 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 joined between the adjacent tubes 111 and 211. It is comprised by the laminated body arrange | positioned alternately. Hereinafter, the stacking direction in the stacked body of the plurality of tubes 111 and 211 and the plurality of fins 112 is referred to as a tube stacking 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 this embodiment, when the windward heat exchange core part 11 is viewed from the flow direction X 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 stacking is performed. The second upwind heat exchange core portion 11b is configured by a tube group existing on the left side of the direction.

  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 the present embodiment, when the leeward side heat exchange core part 21 is viewed from the flow direction X of the blown air, the first leeward side heat exchange core part 21a is configured by a tube group existing on the right side in 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 direction. In the present embodiment, when viewed from the flow direction X of the blown air, the first windward side heat exchange core part 11a and the first leeward side heat exchange core part 21a are arranged so as to overlap (oppose) each other. At the same time, the second windward 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 is formed of 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 X 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 fin 112 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 promotes heat exchange to expand the heat transfer area between the blown air and the refrigerant. Functions as a means.

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

  The first upwind tank 12 is closed at one end (the left end when viewed from the blowing air flow direction X) and at the other end (the right end when viewed from the blowing air flow direction X). Part) is formed of a cylindrical member in which a refrigerant outlet 12a for leading 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 each heat exchange core unit 11 a of the upwind heat exchange core unit 11. , 11b functions as a refrigerant collecting unit that collects the refrigerant.

  The refrigerant lead-out part 12a is provided at the end on the same side as the refrigerant introduction part 22a described later in the tube stacking direction in the first upwind tank part 12. Moreover, the 1st windward heat exchange core part 11a is arrange | positioned at the side near the refrigerant | coolant derivation | leading-out part 12a rather than the 2nd windward heat exchange core part 11b. In other words, the refrigerant outlet 12a is provided at the end of the first upwind tank 12 at the first upwind heat exchange core 11a 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 heat exchange core part 21a of the leeward side heat exchange core part 21 is comprised. , 21b functions as a refrigerant distributor that distributes the refrigerant to 21b.

  The refrigerant introduction part 22a is provided on one end side of the first leeward tank part 22 in the tube stacking direction. The first leeward heat exchange core 21a is disposed closer to the refrigerant introduction part 22a than the second leeward heat exchange core 21b. In other words, the refrigerant introduction part 22a is provided at the end of the first leeward tank part 22 on the first leeward heat exchange core part 21a side in the tube stacking direction.

  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.

  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.

  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 unit 30 includes two intermediate tank units 31 and 32. Each of the two intermediate tank portions 31 and 32 is configured by a cylindrical member in which a refrigerant flow passage through which a refrigerant flows is formed.

  Of the two intermediate tank portions 31, one intermediate tank portion (hereinafter referred to as the first intermediate tank portion 31) includes the first refrigerant collecting portion 23a of the second leeward tank portion 23 and the second leeward tank portion. A first refrigerant flow passage 31a that communicates with the 13 second refrigerant distribution portions 13b is formed. Of the two intermediate tank portions 31, the other intermediate tank portion (hereinafter referred to as the second intermediate tank portion 32) includes the second refrigerant collecting portion 23b of the second leeward tank portion 23 and the second leeward tank portion. A second refrigerant flow passage 32a that communicates with the 13 first refrigerant distribution portions 13a is formed.

  Here, in this embodiment, the 1st refrigerant | coolant flow path 31a in the 1st intermediate | middle tank part 31 comprises the "1st communication part" as described in a claim. Further, the second refrigerant flow passage 32a in the second intermediate tank portion 32 constitutes a “second communication portion” described in the claims.

  By the way, the 1st windward through-hole 13c which penetrates the front and back is formed in the part in the refrigerant | coolant derivation | leading-out part 12a side rather than the partition member 131 in the 2nd windward tank part 13. As shown in FIG. Further, a second upwind side through hole 13d penetrating the front and back is formed in a portion of the second upwind tank portion 13 on the opposite side of the partition member 131 from the refrigerant outlet portion 12a.

  A first leeward side through hole 23c penetrating the front and back is formed in a portion of the second leeward tank portion 23 closer to the refrigerant introduction portion 22a than the partition member 231. Further, a second leeward through hole 23d penetrating the front and back of the second leeward tank portion 23 is formed on the opposite side of the partition member 231 from the refrigerant introduction portion 22a.

  A first intermediate tank portion-side through hole 31b penetrating the front and back is formed in a portion of the first intermediate tank portion 31 corresponding to the first leeward-side through hole 23c. The first intermediate tank portion side through hole 31b communicates with the first leeward side through hole 23c directly or through another communication member (flow path forming member).

  A second intermediate tank portion side through hole 31c penetrating the front and back is formed in a portion corresponding to the second upwind through hole 13d in the first intermediate tank portion 31. The second intermediate tank portion side through hole 31c communicates with the second upwind through hole 13d directly or through another communication member (flow path forming member).

  A third intermediate tank portion side through hole 32b penetrating the front and back is formed at a portion of the second intermediate tank portion 32 corresponding to the second leeward side through hole 23d. The third intermediate tank portion side through hole 32b communicates with the second leeward side through hole 23d directly or through another communication member (flow path forming member).

  A portion corresponding to the first upwind through hole 13c in the second intermediate tank portion 32 is formed with a fourth intermediate tank portion side through hole 32c penetrating the front and back. The fourth intermediate tank portion side through hole 32c communicates with the first upwind through hole 13c directly or through another communication member (flow path forming member).

  Inside the first leeward tank portion 22, a guide portion 40 is provided that guides a part of the refrigerant introduced from the refrigerant introduction portion 22a to the second leeward heat exchange core portion 21b side. The guide part 40 is formed in a cylindrical shape extending in the tube stacking direction. One end portion of the guide portion 40 is connected to the refrigerant introduction portion 22a. The other end portion of the guide portion 40 is located at a substantially central portion of the first leeward tank portion 22 in the tube stacking direction.

  By providing the guide part 40 configured in this way, most of the refrigerant introduced from the refrigerant introduction part 22a is guided to the second leeward heat exchange core part 21b side through the guide part 40, and the second It flows into the leeward side heat exchange core 21b. Further, a part of the refrigerant introduced from the refrigerant introduction part 22a flows out from the guide part 40, then flows to the first windward core part 21a side, and flows into the first leeward heat exchange core part 21a.

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

  As shown in FIG. 3, the low-pressure refrigerant decompressed by the expansion valve (not shown) passes through the guide portion 40 from the refrigerant introduction portion 22 a formed on one end side of the first leeward tank portion 22 as indicated by an arrow A. Through the tank. The refrigerant introduced into the first leeward tank unit 22 descends the first leeward heat exchange core portion 21a of the leeward heat exchange core portion 21 as indicated by an arrow B, and leeward heat exchange as indicated by an arrow C. The second leeward heat exchange core portion 21b of the core portion 21 is lowered.

  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.

  As indicated by arrow F, the refrigerant flowing into the first refrigerant collecting portion 23a passes through the first leeward side through hole 23c and the first intermediate tank portion side through hole 31b, and the first refrigerant flow passage 31a of the first intermediate tank portion 31 is obtained. Flow into. In addition, the refrigerant flowing into the second refrigerant collecting portion 23b passes through the second refrigerant flow in the second intermediate tank portion 32 through the second leeward through hole 23d and the third intermediate tank portion through hole 32b as indicated by an arrow G. It flows into the path 32a.

  As indicated by an arrow H, the refrigerant flowing into the first refrigerant flow passage 31a passes through the second intermediate tank part side through hole 31c and the second wind side through hole 13d, and the second refrigerant distribution part of the second wind side tank part 13 is used. Flows into 13b. Further, the refrigerant flowing into the second refrigerant flow passage 32a is, as indicated by the arrow I, the first refrigerant in the second upwind tank section 13 through the fourth intermediate tank section side through hole 32c and the first upwind through hole 13c. It flows into the distribution unit 13a.

  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 indicated by an arrow N, the refrigerant 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.

  In the refrigerant evaporator 1 according to the present embodiment described above, a part of the refrigerant introduced from the refrigerant introduction part 22a is exchanged in the second leeward side heat exchange inside the first leeward side tank part 22 in the leeward side evaporation part 20. A guide portion 40 that leads to the core portion 21b side is provided. As a result, as shown in FIG. 4, even when the flow rate of the refrigerant flowing through the refrigeration cycle is low, the liquid-phase refrigerant introduced from the refrigerant introduction part 22a is reliably supplied to the second leeward heat exchange core part 21b. Can flow in.

  As a result, as shown in FIG. 5, the liquid-phase refrigerant can be reliably circulated through the first upwind heat exchange core portion 11 a of the upwind evaporator 10. Thereby, when the refrigerant that has flowed from the second windward heat exchange core portion 11b of the windward evaporator 10 into the first windward tank portion 12 flows toward the refrigerant outlet portion 12a, the first windward heat exchange core portion. Backflow to 11a can be suppressed. For this reason, it can suppress that refrigeration oil stagnates inside the refrigerant evaporator 1.

(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 guide unit 40.

  As shown in FIG. 6, a plurality of through holes 41 are provided in a lower portion of the guide portion 40 of the present embodiment, that is, a portion closer to the second leeward tank portion 23 in the longitudinal direction of the tube 211. ing. Through the through hole 41, a part of the refrigerant introduced from the refrigerant introduction part 22a is guided to the first leeward heat exchange core part 21a side. Therefore, the through hole 41 of the present embodiment corresponds to an “opening” in the claims.

  According to the present embodiment, a part of the liquid-phase refrigerant that has flowed into the guide portion 40 from the refrigerant introduction portion 22a can be caused to flow into the first leeward heat exchange core portion 21a through the through hole 41. For this reason, since the flow volume of the liquid-phase refrigerant | coolant which flows into the 2nd windward heat exchange core part 11b can be increased, when the refrigerant evaporator 1 is seen from the flow direction X of blowing air, the windward heat exchange core part 11 and the leeward side heat exchange core portion 21 can be made to easily flow the liquid refrigerant through the entire region to be polymerized. Therefore, it can suppress that temperature distribution arises in the ventilation air which passes through the refrigerant | coolant evaporator 1. FIG.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is different from the first embodiment in the configuration of the guide portion 40.

  As shown in FIG. 7, the guide portion 40 of this embodiment is formed in a flat plate shape that is orthogonal to the longitudinal direction of the tube 211. The guide part 40 is connected to the refrigerant introduction part 22a so that the liquid-phase refrigerant introduced from the refrigerant introduction part 22a flows on the upper surface of the guide part 40. The guide portion 40 is joined to the inner wall surface of the first leeward tank portion 22.

  According to this, even when the flow rate of the refrigerant flowing through the refrigeration cycle is low, the liquid-phase refrigerant introduced from the refrigerant introduction part 22a can surely flow into the second leeward heat exchange core part 21b. Therefore, the same effect as that of the first embodiment can be obtained.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is different from the first embodiment in the configuration of the guide portion 40.

  As shown in FIG. 8, the guide portion 40 of the present embodiment includes a first space 221 that communicates the space in the first leeward tank portion 22 with the refrigerant introduction portion 22a and the second leeward heat exchange core portion 21b. The first leeward side heat exchange core portion 21a is configured to be partitioned into a second space 222 communicating with the first leeward side heat exchange core portion 21a. The first space 221 has a substantially L-shaped cross section viewed from the flow direction X of the blown air. The second space 222 is disposed between the first space 221 and the first leeward heat exchange core portion 21a.

  Specifically, the guide portion 40 includes a first flat plate portion 42 formed in a flat plate shape orthogonal to the longitudinal direction of the tube 211 and a second flat plate portion 43 formed in a flat plate shape orthogonal to the tube stacking direction. It is configured. One end portion of the first flat plate portion 42 in the tube stacking direction is connected to the lower end portion of the refrigerant introduction portion 22a. The other end portion of the first flat plate portion 42 in the tube stacking direction is located at a substantially central portion of the first leeward tank portion 22 in the tube stacking direction. The second flat plate portion 43 is connected to the other end portion of the first flat plate portion 42 in the tube stacking direction. The first flat plate portion 42 and the second flat plate portion 43 are joined to the inner wall surface of the first leeward tank portion 22.

  The first flat plate portion 42 in the guide portion 40 is provided with a plurality of through holes 41. Through the through hole 41, a part of the refrigerant introduced from the refrigerant introduction part 22a is guided to the first leeward heat exchange core part 21a side. That is, the first space 221 and the second space 222 communicate with each other through the through hole 41. Here, the through hole 41 of the present embodiment corresponds to an “opening” in the claims.

  As described above, by providing the guide portion 40 inside the first leeward tank portion 22, the liquid phase introduced from the refrigerant introduction portion 22a even when the flow rate of refrigerant flowing through the refrigeration cycle is low. The refrigerant can surely flow into the second leeward heat exchange core portion 21b. Thereby, the effect similar to the said 1st Embodiment can be acquired.

  Furthermore, by providing the through hole 41 in the first flat plate portion 42 of the guide portion 40, a part of the liquid-phase refrigerant that has flowed into the upper surface of the guide portion 40 (first flat plate portion 42) from the refrigerant introducing portion 22a is passed through the through hole. 41 can flow into the first leeward heat exchange core 21a. For this reason, since the flow volume of the liquid-phase refrigerant | coolant which flows into the 2nd windward heat exchange core part 11b can be increased, when the refrigerant evaporator 1 is seen from the flow direction X of blowing air, the windward heat exchange core part 11 and the leeward side heat exchange core portion 21 can be made to easily flow the liquid refrigerant through the entire region to be polymerized. Therefore, it can suppress that temperature distribution arises in the ventilation air which passes through the refrigerant | coolant evaporator 1. FIG.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment is different from the first embodiment in the configuration of the windward side heat exchange core part 11 and the leeward side heat exchange core part 21.

  FIG. 9 is a diagram for explaining the refrigerant flow from the leeward heat exchange core portion 11 to the leeward heat exchange core portion 21. For convenience of illustration, the leeward heat exchange core portion 21 is shown upside down. . That is, in the refrigerant evaporator 1 in which the refrigerant flows as shown in FIG. 9, the first leeward tank unit 22 is arranged upward and the second leeward tank unit 23 is arranged downward.

  As shown in FIG. 9, the windward heat exchange core portion 11 includes a first windward heat exchange core portion 11 a configured by a part of the tube group among the plurality of tubes 111. Furthermore, the windward side heat exchange core part 11 is the 2nd windward side heat exchange comprised by some tube groups among the remaining tube groups except the tube group which comprises the 1st windward heat exchange core part 11a. It has the core part 11b and the 3rd upwind heat exchange core part 11b comprised by the remaining tube group.

  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 this embodiment, when the windward heat exchange core part 11 is viewed from the flow direction X 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 stacking is performed. The second upwind heat exchange core portion 11b is configured by a tube group existing on the left side of the direction. Moreover, when the windward heat exchange core part 11 is viewed from the flow direction X of the blown air, the third windward heat exchange core part 11c is configured by a tube group existing in the central part in the tube stacking direction.

  Moreover, the leeward side heat exchange core part 21 has the 1st leeward side heat exchange core part 21a comprised by some tube groups among the some tubes 211. FIG. Furthermore, the leeward side heat exchange core part 21 is a second leeward side heat exchange composed of a part of the tube group of the remaining tube groups excluding the tube group constituting the first leeward side heat exchange core part 21a. It has the 3rd leeward side heat exchange core part 21c comprised by the core part 21b and the remaining tube groups.

  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 the present embodiment, when the leeward side heat exchange core part 21 is viewed from the flow direction X of the blown air, the first leeward side heat exchange core part 21a is configured by a tube group existing on the right side in 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 direction. Moreover, when the leeward side heat exchange core part 21 is viewed from the flow direction X of the blown air, the third leeward side heat exchange core part 21c is configured by a tube group existing in the center part in the tube stacking direction.

  In the present embodiment, when viewed from the flow direction X of the blown air, the first windward side heat exchange core part 11a and the first leeward side heat exchange core part 21a are arranged so as to overlap (oppose) each other. At the same time, the second windward 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. Furthermore, when viewed from the flow direction X of the blown air, the third windward side heat exchange core part 11c and the third leeward side heat exchange core part 21c are arranged so as to be superposed (opposed).

  The first upwind heat exchange core portion 11a is disposed closer to the refrigerant outlet 12a than both the second upwind heat exchange core portion 11b and the third upwind heat exchange core portion 11c. Moreover, the 3rd windward heat exchange core part 11c is arrange | positioned at the side near the refrigerant | coolant derivation | leading-out part 12a rather than the 2nd windward heat exchange core part 11b. That is, the first upwind heat exchange core portion 11a, the third upwind heat exchange core portion 11c, and the second upwind heat exchange core portion 11b are arranged in this order from the side close to the refrigerant outlet portion 12a.

  The first leeward side heat exchange core part 21a is disposed closer to the refrigerant introduction part 22a than both the second leeward side heat exchange core part 21b and the third leeward side heat exchange core part 21c. Moreover, the 3rd leeward side heat exchange core part 21c is arrange | positioned rather than the 2nd leeward side heat exchange core part 21b at the side near the refrigerant | coolant introduction part 22a. That is, the 1st leeward side heat exchange core part 21a, the 3rd leeward side heat exchange core part 21c, and the 2nd leeward side heat exchange core part 21b are arrange | positioned in this order from the side close | similar to the refrigerant introduction part 22a.

  Two partition members 131 are arranged at equal intervals in the second upwind tank section 13 disposed below. By the two partition members 131, the space in which the tank 111 communicates with each tube 111 constituting the first upside heat exchange core portion 11a and each tube 111 constituting the second upside heat exchange core portion 11b. It is partitioned into a communicating space and a space where the tubes 111 constituting the third upwind heat exchange core portion 11c communicate.

  Here, a space communicating with each tube 111 constituting the third upwind heat exchange core portion 11c in the second upwind tank portion 13 distributes the refrigerant to the third upwind heat exchange core portion 11c. The 3rd refrigerant | coolant distribution part 13c is comprised.

  Two partition members 231 are arranged at equal intervals in the second leeward tank portion 23 disposed below. By the two partition members 231, a space in which the tank inner space communicates with each tube 211 constituting the first leeward side heat exchange core portion 21 a and each tube 211 constituting the second leeward side heat exchange core portion 21 b are formed. It is partitioned into a communicating space and a space where the tubes 211 constituting the third leeward heat exchange core portion 21c communicate.

  Here, in the inside of the second leeward side tank portion 23, the space where the tubes 211 constituting the third leeward side heat exchange core portion 21c communicate with each other collects the refrigerant from the third leeward side heat exchange core portion 21b. The 3rd refrigerant | coolant gathering part 23c to be made is comprised.

  The refrigerant replacement unit 30 according to the present embodiment guides the refrigerant in the first refrigerant collecting unit 23a in the second leeward tank unit 23 to the second refrigerant distribution unit 13b in the second leeward tank unit 13 and the second leeward side. The refrigerant in the second refrigerant collecting portion 23b in the tank portion 23 is configured to be guided to the third refrigerant distributing portion 13c in the second upwind tank portion 13. Furthermore, the refrigerant replacement unit 30 of the present embodiment is configured to guide the refrigerant in the third refrigerant collecting unit 23c in the second leeward tank unit 23 to the first refrigerant distribution unit 13a in the second leeward tank unit 13. ing.

  A guide unit 40 is provided inside the first leeward tank unit 22 disposed above. One end portion of the guide portion 40 is connected to the refrigerant introduction portion 22a. In the present embodiment, the other end portion of the guide portion 40 is located at a portion corresponding to a boundary portion between the second leeward side heat exchange core portion 21b and the third leeward side heat exchange core portion 21c in the first leeward side tank portion 22. positioned.

  As described above, by providing the guide portion 40 inside the first leeward tank portion 22, the liquid phase introduced from the refrigerant introduction portion 22a even when the flow rate of refrigerant flowing through the refrigeration cycle is low. The refrigerant can surely flow into the second leeward heat exchange core portion 21b. In addition, the liquid phase refrigerant introduced from the refrigerant introduction part 22a can be easily flown into the third leeward heat exchange core part 21c. Thereby, the effect similar to the said 1st Embodiment can be acquired.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment is different from the first embodiment in the configuration of the windward side heat exchange core part 11 and the leeward side heat exchange core part 21.

  FIG. 10 is a diagram for explaining the refrigerant flow from the windward side heat exchange core part 11 to the leeward side heat exchange core part 21, and the leeward side heat exchange core part 21 is shown upside down for convenience of illustration. . That is, in the refrigerant evaporator 1 in which the refrigerant flows as shown in FIG. 10, the first leeward tank unit 22 is disposed above and the second leeward tank unit 23 is disposed below.

  As shown in FIG. 10, the windward heat exchange core portion 11 includes a first windward heat exchange core portion 11 a constituted by a part of a plurality of tubes 111, and one of the remaining tube groups. It has the 2nd upwind heat exchange core part 11b comprised by the tube group of a part. Furthermore, the windward heat exchange core part 11 is a part of the tube groups of the remaining tube groups excluding the tube groups constituting the first windward heat exchange core part 11a and the second windward heat exchange core part 11b. And a fourth upwind heat exchange core portion 11d formed of the remaining tube group.

  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 portion 11 is viewed from the flow direction X of the blown air, the first windward heat exchange core portion 11a is configured by a tube group existing on the right end side in the tube stacking direction. The second upwind heat exchange core portion 11b is configured by a tube group existing on the left end side in the stacking direction. Moreover, when the windward heat exchange core part 11 is viewed from the flow direction X of the blown air, the third windward heat exchange core part 11c is configured by a tube group existing on the central right side in the tube stacking direction, A tube group existing on the left side of the center constitutes the fourth upwind heat exchange core portion 11d.

  Moreover, the leeward side heat exchange core part 21 is comprised by the 1st leeward side heat exchange core part 21a comprised by some tube groups among the some tubes 211, and some tube groups among the remainder. It has the 2nd leeward side heat exchange core part 21b. Furthermore, the leeward side heat exchange core part 21 is a part of the tube group of the remaining tube groups excluding the tube groups constituting the first leeward side heat exchange core part 21a and the second leeward side heat exchange core part 21b. And a fourth leeward side heat exchange core part 21d constituted by the remaining tube group.

  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 the present embodiment, when the leeward heat exchange core portion 21 is viewed from the flow direction X of the blown air, the first leeward heat exchange core portion 21a is configured by a tube group existing on the right end side in the tube stacking direction. The second leeward heat exchange core portion 21b is configured by a tube group existing on the left end side in the stacking direction. Further, when the leeward heat exchange core portion 21 is viewed from the flow direction X of the blown air, the third leeward heat exchange core portion 21c is configured by the tube group existing on the center right side in the tube stacking direction, The fourth leeward heat exchange core portion 21d is configured by a tube group existing on the left side of the center.

  In the present embodiment, when viewed from the flow direction X of the blown air, the first windward side heat exchange core part 11a and the first leeward side heat exchange core part 21a are arranged so as to overlap (oppose) each other. At the same time, the second windward 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. Furthermore, when viewed from the flow direction X of the blown air, the third windward side heat exchange core part 11c and the third leeward side heat exchange core part 21c are arranged so as to overlap (oppose), and the fourth wind side The upper heat exchange core part 11d and the fourth leeward heat exchange core part 21d are arranged so as to overlap (oppose) each other.

  The first windward heat exchange core part 11a is closer to the refrigerant derivation part 12a than any of the second windward heat exchange core part 11b, the third windward heat exchange core part 11c, and the fourth windward heat exchange core part 11d. Arranged on the side. The third upwind heat exchange core portion 11c is disposed closer to the refrigerant outlet 12a than both the second upwind heat exchange core portion 11b and the fourth upwind heat exchange core portion 11d. Moreover, the 4th windward heat exchange core part 11d is arrange | positioned at the side near the refrigerant | coolant derivation | leading-out part 12a rather than the 2nd windward heat exchange core part 11b.

  That is, the first upwind heat exchange core portion 11a, the third upwind heat exchange core portion 11c, the fourth upwind heat exchange core portion 11d, and the second upwind heat exchange core portion 11b are close to the refrigerant outlet portion 12a. Are arranged in this order.

  The first leeward side heat exchange core part 21a is closer to the refrigerant introduction part 22a than any of the second leeward side heat exchange core part 21b, the third leeward side heat exchange core part 21c, and the fourth leeward side heat exchange core part 21d. Arranged on the side. In addition, the third leeward side heat exchange core part 21c is disposed closer to the refrigerant introduction part 22a than both the second leeward side heat exchange core part 21b and the fourth leeward side heat exchange core part 21d. Further, the fourth leeward heat exchange core portion 21d is disposed closer to the refrigerant introduction portion 22a than the second leeward heat exchange core portion 21b.

  That is, the first leeward side heat exchange core part 21a, the third leeward side heat exchange core part 21c, the fourth leeward side heat exchange core part 21d, and the second leeward side heat exchange core part 21b are close to the refrigerant introduction part 22a. Are arranged in this order.

  Three partition members 131 are arranged at equal intervals in the second upwind tank section 13. By the three partition members 131, the space in which the tank communicates with each tube 111 constituting the first windward heat exchange core portion 11a and the tubes 111 constituting the second windward heat exchange core portion 11b. It is partitioned into a communicating space, a space where each tube 111 constituting the third upwind heat exchange core portion 11c communicates, and a space where each tube 111 constituting the fourth upside heat exchange core portion 11d communicates. Yes.

  Here, a space communicating with each tube 111 constituting the third upwind heat exchange core portion 11c in the second upwind tank portion 13 distributes the refrigerant to the third upwind heat exchange core portion 11c. The 3rd refrigerant | coolant distribution part 13c is comprised. The 4th refrigerant | coolant which distributes a refrigerant | coolant to the 4th windward heat exchange core part 11d in the space which is connected to each tube 111 which comprises the 4th windward heat exchange core part 11d among the insides of the 2nd windward side tank part 13. The distribution unit 13d is configured.

  Inside the second leeward tank unit 23, three partition members 231 are arranged at equal intervals. By the three partition members 231, a space in which the tank inner space communicates with each tube 211 constituting the first leeward side heat exchange core portion 21 a and each tube 211 constituting the second leeward side heat exchange core portion 21 b are formed. It is partitioned into a communicating space, a space communicating with each tube 211 constituting the third leeward heat exchange core portion 21c, and a space communicating with each tube 211 constituting the fourth leeward heat exchange core portion 21d. Yes.

  Here, in the inside of the second leeward side tank portion 23, the space where the tubes 211 constituting the third leeward side heat exchange core portion 21c communicate with each other collects the refrigerant from the third leeward side heat exchange core portion 21b. The 3rd refrigerant | coolant gathering part 23c to be made is comprised. A space where the tubes 211 constituting the fourth leeward heat exchange core portion 21d communicate with each other in the second leeward tank portion 23 collects refrigerant from the fourth leeward heat exchange core portion 21d. A refrigerant assembly 23d is configured.

  The refrigerant replacement unit 30 according to the present embodiment guides the refrigerant in the first refrigerant collecting unit 23a in the second leeward tank unit 23 to the second refrigerant distribution unit 13b in the second leeward tank unit 13 and the second leeward side. The refrigerant in the second refrigerant collecting portion 23b in the tank portion 23 is configured to be guided to the fourth refrigerant distributing portion 13d in the second upwind tank portion 13. Furthermore, the refrigerant replacement unit 30 of the present embodiment guides the refrigerant in the third refrigerant assembly 23c in the second leeward tank unit 23 to the first refrigerant distribution unit 13a in the second leeward tank unit 13, and the second The refrigerant in the fourth refrigerant assembly part 23d in the leeward tank part 23 is configured to be guided to the third refrigerant distribution part 13c in the second leeward tank part 13.

  A guide portion 40 is provided inside the first leeward tank portion 22. One end portion of the guide portion 40 is connected to the refrigerant introduction portion 22a. In the present embodiment, the other end of the guide portion 40 is located at a portion corresponding to a boundary portion between the second leeward heat exchange core portion 21b and the fourth leeward heat exchange core portion 21d in the first leeward tank portion 22. positioned.

  As described above, by providing the guide portion 40 inside the first leeward tank portion 22, the liquid phase introduced from the refrigerant introduction portion 22a even when the flow rate of refrigerant flowing through the refrigeration cycle is low. The refrigerant can surely flow into the second leeward heat exchange core portion 21b. In addition, the liquid-phase refrigerant introduced from the refrigerant introduction part 22a can easily flow into the third leeward heat exchange core part 21c and the fourth leeward heat exchange core part 21d. Thereby, the effect similar to the said 1st Embodiment can be acquired.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows, for example, within a range not departing from the gist of the present invention. Further, the means disclosed in each of the above embodiments may be appropriately combined within a practicable range.

  (1) In the above-described embodiment, the example in which the refrigerant replacement unit 30 includes the first intermediate tank unit 31 and the second intermediate tank unit 32 has been described. However, the configuration of the refrigerant replacement unit 30 is not limited thereto. For example, the first and second intermediate tank portions 31 and 32 of the refrigerant replacement unit 30 are eliminated, and the refrigerant in the first refrigerant assembly portion 23a of the second leeward tank unit 23 is replaced with the second refrigerant of the second leeward tank unit 13. A communication member that leads to the distribution unit 13b and a communication member that guides the refrigerant in the second refrigerant assembly portion 23b of the second leeward tank unit 23 to the first refrigerant distribution unit 13a of the second leeward tank unit 13 may be provided. Good. In addition, as this communication member, you may employ | adopt piping etc., for example.

  (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, the structure of the refrigerant evaporator 1 is not limited to this. For example, the refrigerant evaporator 1 is arranged so that at least a part of the first windward side heat exchange core part 11a and the first leeward side heat exchange core part 21a are superposed when viewed from the flow direction of the blown air. Or at least a part of the second leeward heat exchange core portion 11b and the second leeward heat exchange core portion 21b may be superposed.

  (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 first to fourth embodiments described above, one end portion of the guide portion 40 is connected to the refrigerant introduction portion 22a, and the other end portion of the guide portion 40 is connected to the first leeward tank portion 22 in the tube stacking direction. Although the example located in the substantially central part was demonstrated, the position of the other end part of the guide part 40 is not limited to this. For example, the other end portion of the guide portion 40 may be positioned closer to the refrigerant introduction portion 22a than the substantially central portion of the first leeward tank portion 22 in the tube stacking direction, or the first leeward tank portion 22 may be positioned. May be located on the side farther from the refrigerant introduction portion 22a than the substantially central portion in the tube stacking direction.

  Moreover, in the above-mentioned 5th Embodiment, the other end part of the guide part 40 is a boundary part of the 2nd leeward side heat exchange core part 21b in the 1st leeward side tank part 22, and the 3rd leeward side heat exchange core part 21c. However, the position of the other end portion of the guide portion 40 is not limited to this. For example, the other end portion of the guide portion 40 is positioned at a portion corresponding to a boundary portion between the first leeward side heat exchange core portion 21a and the third leeward side heat exchange core portion 21c in the first leeward side tank portion 22. Also good.

  Further, in the above-described sixth embodiment, the other end portion of the guide portion 40 is a boundary portion between the second leeward heat exchange core portion 21b and the fourth leeward heat exchange core portion 21d in the first leeward tank portion 22. However, the position of the other end portion of the guide portion 40 is not limited to this. For example, the other end portion of the guide portion 40 is positioned at a portion corresponding to a boundary portion between the third leeward side heat exchange core portion 21c and the fourth leeward side heat exchange core portion 21d in the first leeward side tank portion 22. Also good.

  (7) Although the above-mentioned embodiment explained the example which divided upwind side heat exchange core part 11 and leeward side heat exchange core part 21 into two to four heat exchange core parts 11a-11d and 21a-21d. Not limited to this, it may be divided into five or more heat exchange core parts.

  (8) In the above-described embodiment, the example has been described in which the windward side heat exchange core part 11 and the leeward side 23 side heat exchange core part 21 are divided into the same number of heat exchange core parts 11a to 11d and 21a to 21d. The configurations of the windward side heat exchange core part 11 and the leeward side heat exchange core part 21 are not limited to this. For example, as shown in FIG. 11, the windward side heat exchange core part 11 is divided into two heat exchange core parts 11a and 11b, and the leeward side heat exchange core part 21 is divided into three heat exchange core parts 21a to 21c. You may divide into.

  In addition, FIG. 11 is a figure explaining the refrigerant | coolant flow from the leeward side heat exchange core part 11 to the leeward side heat exchange core part 21, and shows the leeward side heat exchange core part 21 upside down for convenience of illustration. ing. That is, in the refrigerant evaporator 1 in which the refrigerant flows as shown in FIG. 11, the first leeward tank unit 22 is disposed above and the second leeward tank unit 23 is disposed below.

10 Upwind evaporator (second evaporator)
20 leeward evaporation section (first evaporation section)
21 Downward heat exchange core (heat exchange core of the first evaporation unit)
21a 1st leeward side heat exchange core part (1st core part)
21b 2nd leeward side heat exchange core part (2nd core part)
22 1st leeward tank part (the other tank part of the 1st evaporation part)
22a Refrigerant introduction part 40 Guide part

Claims (2)

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, among the plurality of tubes (211), a first core part (21a) constituted by a part of a tube group, and a remaining part It has the 2nd core part (21b) comprised by at least one part tube group among tube groups,
The heat exchange core part (11) in the second evaporation part (10) includes a third core part (11a) constituted by a part of a tube group among the plurality of tubes (111), and the remaining part. Having a fourth core portion (11b) composed of at least some of the tube groups;
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 evaporating section (20) and the second evaporating section (10) include a first communicating section (31a) for guiding the refrigerant in the first refrigerant collecting section (23a) to the second refrigerant distributing section (13b), And connected via a second communication part (32a) for guiding the refrigerant of the second refrigerant assembly part (23b) to the first refrigerant distribution part (13a),
Among the pair of tank parts (22, 23) of the first evaporation part (20), in the other tank part (22), the other tank part ( 22) A refrigerant introduction part (22a) for introducing refrigerant into the interior is connected,
Of the pair of tank parts (12, 13) of the second evaporation part (10), the other tank part (12) on the same side as the refrigerant introduction part (22a) in the stacking direction of the tubes (111). A refrigerant outlet part (12a) for leading out the refrigerant from the inside of the other tank part (11b) is connected to the end part,
The first core part (21a) is disposed closer to the refrigerant introduction part (22a) than the second core part (21b),
The third core part (11a) is arranged closer to the refrigerant outlet part (12a) than the fourth core part (11b),
A part of the refrigerant introduced from the refrigerant introduction part (22a) is guided to the second core part (21b) side inside the other tank part (22) in the first evaporation part (20). A guide part (40) is provided ,
Of the refrigerant introduced from the refrigerant introduction part (22a), the amount of refrigerant that is guided to the second core part (21b) side through the guide part (40) and flows into the second core part (21b). Is larger than the amount of refrigerant flowing into the first core portion (21a) after flowing out of the guide portion (40) and flowing into the first core portion (21a) .   The guide part (40) is provided with an opening (41) for guiding a part of the refrigerant introduced from the refrigerant introduction part (22a) to the first core part (21a) side. The refrigerant evaporator according to claim 1.

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