WO2016113825A1

WO2016113825A1 - Refrigerant evaporator

Info

Publication number: WO2016113825A1
Application number: PCT/JP2015/006432
Authority: WO
Inventors: 長屋　誠一; 直久石坂; 森本　正和; 章太茶谷; 鳥越　栄一
Original assignee: 株式会社デンソー
Priority date: 2015-01-14
Filing date: 2015-12-24
Publication date: 2016-07-21
Also published as: JP2016130612A; JP6341099B2

Abstract

This refrigerant evaporator exchanges heat between a refrigerant and a fluid to be cooled, said fluid flowing outside. The refrigerant evaporator is provided with a first evaporating section (20) and a second evaporating section (10), which respectively have heat exchanging core sections (11, 21), upper tank sections (12, 22), and lower tank sections (13, 23). The heat exchanging core section (21) of the first evaporating section has a first core section (21a) and a second core section (21b), and the heat exchanging core section (11) of the second evaporating section has a third core section (11a) and a fourth core section (11b). The upper tank section (22) of the first evaporating section has a refrigerant inlet section (22a), and an upper tank section (12) of the second evaporating section has a refrigerant outlet section (12a). The upper tank section of the second evaporating section has a first independent flow channel (12b) and a second independent flow channel (12c), in which the refrigerant flowed out from the third core section and the refrigerant flowed out from the fourth core section independently flow toward the refrigerant outlet section.

Description

Refrigerant evaporator

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-005282 filed on Jan. 14, 2015, the disclosure of which is incorporated herein by reference.

This disclosure 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 constitutes a refrigeration cycle together with a compressor and the like, and a refrigerant evaporator is disclosed in Patent Document 1. The refrigerant evaporator includes a first evaporator and a second evaporator disposed in series with respect to the flow direction of the fluid to be cooled. Each of the first evaporation section and the second evaporation section includes a heat exchange core section configured by stacking a plurality of tubes extending in the vertical direction, an upper tank section connected to both end sides in the vertical direction of the plurality of tubes, and And a lower tank portion.

The heat exchange core part of the first evaporation part includes a first core part having a tube group on one side in the tube stacking direction and a second core part having a tube group on the other side in the tube stacking direction. Yes. The heat exchange core part of the second evaporation part has a third core part having a tube group facing the first core part, and a fourth core part having a tube group facing the second core part. The upper tank part of the first evaporation part is provided with a refrigerant inlet part at an end part on one side in the tube stacking direction which is closer to the first core part than the second core part. The upper tank section of the second evaporation section is provided with a refrigerant outlet section on the same side as the refrigerant inlet section, that is, on one end in the tube stacking direction, which is closer to the third core section than the fourth core section. ing.

The first evaporation section and the second evaporation section are configured such that the refrigerant flows into the first core section and the second core section from the upper tank section of the first evaporation section, and the refrigerant flowing out from the first core section is the second evaporation section. After the refrigerant flowing into the fourth core portion and flowing out from the second core portion flows into the third core portion of the second evaporation portion, the refrigerant flowing out from the third core portion and the fourth core portion undergoes second evaporation. It is comprised so that it may flow into the upper tank part of a part.

Thus, in the refrigerant evaporator of Patent Document 1, the refrigerant flowing on one side in the width direction of the heat exchange core part of the first evaporation part flows to the other side in the width direction of the heat exchange core part of the second evaporation part. The refrigerant flowing on the other side in the width direction of the heat exchange core part of the first evaporation part flows to one side in the width direction of the heat exchange core part of the second evaporation part.

Japanese Patent No. 4124136

According to the study by the inventors of the present disclosure, the refrigerant flowing into the upper tank portion of the first evaporation unit from the refrigerant inlet portion because the refrigerant flow rate required for heat exchange is small under the condition of a small heat load. The flow rate is low. The refrigerant flowing from the refrigerant inlet is a gas-liquid two-phase refrigerant. For this reason, when the refrigerant flows into the first and second core parts from the upper tank part in the first evaporation part, a large amount of liquid phase refrigerant flows into the first core part near the refrigerant inlet part, and from the refrigerant inlet part. A large amount of gas-phase refrigerant flows into the far second core portion. As a result, in the second evaporator, a large amount of liquid-phase refrigerant flows in the fourth core part far from the refrigerant outlet part, and a large amount of gas-phase refrigerant flows in the third core part near the refrigerant outlet part.

As a result, in the second evaporation part, when the liquid phase refrigerant that has not completely evaporated out of the liquid phase refrigerant that has flowed into the fourth core part flows in the upper tank part toward the refrigerant outlet part, the upper tank part The third core portion falls from the communicating portion communicating with each tube constituting the third core portion. At this time, the force relationship between the falling liquid-phase refrigerant and the gas-phase refrigerant trying to ascend the third core portion is balanced, and the refrigerant flow in the third core portion stagnates or the dropped liquid-phase refrigerant is transferred to the lower tank portion. Or even flows. As a result, the refrigerant stagnates inside the refrigerant evaporator. The refrigerant circulating in the refrigeration cycle contains oil (refrigerator oil) for internal lubrication of the compressor. Therefore, when the refrigerant stagnates inside the refrigerant evaporator, the oil also stagnates, and the amount of oil returning to the compressor is reduced.

Such a problem is that the heat exchange core part of the first evaporation part has a core part other than the first and second core parts, and the heat exchange core part of the second evaporation part is other than the third and fourth core parts. It also occurs in a refrigerant evaporator having a core.

Also, such a problem is particularly likely to occur in a refrigeration cycle in which the refrigerant flowing out of the refrigerant evaporator does not have to be completely gas phase refrigerant. Examples of such a refrigeration cycle include a refrigeration cycle including an accumulator, a refrigeration cycle including an internal heat exchanger, and the like. The accumulator separates the refrigerant flowing out from the refrigerant evaporator into a liquid phase refrigerant and a gas phase refrigerant, and causes the gas phase refrigerant to flow into the compressor. The internal heat exchanger heats the refrigerant that has flowed out of the refrigerant evaporator by heat exchange with the refrigerant on the upstream side of the refrigerant flow from the refrigerant evaporator, and converts the liquid-phase refrigerant contained in the refrigerant that has flowed out of the refrigerant evaporator into a gas phase. As a refrigerant, a gas-phase refrigerant is allowed to flow into the compressor.

This indication aims at providing the refrigerant evaporator which can control stagnation of the oil inside a refrigerant evaporator in view of the above-mentioned point.

The refrigerant evaporator according to the first aspect of the present disclosure performs heat exchange between the fluid to be cooled flowing outside and the refrigerant. The refrigerant evaporator includes a first evaporator and a second evaporator arranged in series with respect to the flow direction of the fluid to be cooled.

Each of the first evaporator and the second evaporator has a heat exchange core, an upper tank, and a lower tank. The heat exchange core portion is configured by stacking a plurality of tubes that extend in the vertical direction and through which a refrigerant flows. The upper tank portion and the lower tank portion are arranged on both ends in the vertical direction of the plurality of tubes, and collect or distribute the refrigerant flowing through the plurality of tubes.

The heat exchange core part of the first evaporation part has a first core part including a part of the tube group and a second core part including a tube group different from the tube group among the plurality of tubes. . The heat exchange core part of the second evaporation part includes a third core part including a tube group facing at least a part of the first core part in the flow direction of the fluid to be cooled, and the flow of the fluid to be cooled. And a fourth core part including a tube group facing at least a part of the second core part in the direction.

The upper tank part of the first evaporation part has a refrigerant inside the upper tank part of the first evaporation part at the end part closer to the first core part than the second core part among both end parts in the stacking direction of the tubes. Has a refrigerant inlet portion into which the gas flows. The upper tank part of the second evaporation part is a refrigerant from the inside of the upper tank part of the second evaporation part to the end part closer to the third core part than the fourth core part among both end parts in the stacking direction of the tubes. Has a refrigerant outlet part from which the refrigerant flows out.

In the first and second evaporators, the refrigerant flows from the upper tank of the first evaporator to the first and second cores, and the refrigerant that flows out of the first core flows into the fourth core. In addition, after the refrigerant flowing out from the second core portion flows into the third core portion, the refrigerant flowing out from the third core portion and the fourth core portion flows into the upper tank portion of the second evaporation portion. ing.

The upper tank section of the second evaporation section includes a first independent flow path and a second independent flow path where the refrigerant flowing out from the third core section and the refrigerant flowing out from the fourth core section flow independently from each other toward the refrigerant outlet section. have. The first independent flow path and the second independent flow path are the refrigerant outlet portion than the communication portion communicating with the tube closest to the refrigerant outlet portion in the tube group constituting the third core portion in the upper tank portion of the second evaporation portion. The refrigerant that has flowed out of the third and fourth core parts flows independently of each other up to a predetermined position located on the side.

In the refrigerant evaporator according to the first aspect of the present disclosure, the upper tank section of the second evaporation section has first and second independent flow paths. For this reason, in the upper tank part of the 2nd evaporation part, each tube which constitutes the 3rd core part in the middle of the refrigerant channel from each communicating part which communicates with each tube which constitutes the 4th core part to the refrigerant outlet part There is no communication part that communicates with. Thereby, when the liquid phase refrigerant | coolant which flowed out from the 4th core part flows in into the upper tank part of a 2nd evaporation part, it can prevent that liquid phase refrigerant | coolant flowing into a 3rd core part. As a result, oil stagnation inside the refrigerant evaporator can be suppressed.

The refrigerant evaporator according to the second aspect of the present disclosure performs heat exchange between the fluid to be cooled flowing outside and the refrigerant. The refrigerant evaporator includes a first evaporator and a second evaporator arranged in series with respect to the flow direction of the fluid to be cooled.

The upper tank part of the first evaporation part has a refrigerant inlet part into which refrigerant flows into the upper tank part of the first evaporation part at a position closer to the first core part than the second core part. In the first and second evaporators, the refrigerant flows from the upper tank of the first evaporator to the first and second cores, and the refrigerant that flows out of the first core flows into the fourth core. In addition, after the refrigerant flowing out from the second core portion flows into the third core portion, the refrigerant flowing out from the third core portion and the fourth core portion flows into the upper tank portion of the second evaporation portion. ing. The upper tank part of the second evaporation part has a refrigerant outlet part through which the refrigerant flows out from the inside of the upper tank part of the second evaporation part at a position closer to the fourth core part than the third core part.

According to the refrigerant evaporator according to the second aspect of the present disclosure, the refrigerant outlet portion is provided in a portion of the upper tank portion of the second evaporation portion that is closer to the fourth core portion than the third core portion. For this reason, in the upper tank part of the 2nd evaporation part, each tube which constitutes the 3rd core part in the middle of the refrigerant channel from each communicating part which communicates with each tube which constitutes the 4th core part to the refrigerant outlet part There is no communication part that communicates with. Thereby, when the liquid phase refrigerant | coolant which flowed out from the 4th core part flows in into the upper tank part of a 2nd evaporation part, it can prevent that liquid phase refrigerant | coolant flowing into a 3rd core part. As a result, oil stagnation inside the refrigerant evaporator can be suppressed.

The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
It is a schematic diagram of the refrigerating cycle which concerns on 1st Embodiment. 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 sectional drawing of the windward upper tank part which concerns on 1st Embodiment. It is a typical perspective view of the intermediate tank part concerning a 1st embodiment. 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 refrigerant | coolant which flows through the leeward side evaporation part of the refrigerant evaporator which concerns on a comparative example. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the windward evaporation part of the refrigerant evaporator which concerns on a comparative example. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the leeward side evaporation part of the refrigerant evaporator which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the windward evaporation part of the refrigerant evaporator which concerns on 1st Embodiment. It is a typical disassembled perspective view of the windward upper tank part which concerns on 2nd Embodiment. It is a typical perspective view of the refrigerant evaporator which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the flow of the refrigerant | coolant in the refrigerant evaporator which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the leeward side evaporation part of the refrigerant evaporator which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the windward evaporation part of the refrigerant evaporator which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the leeward side evaporation part of the refrigerant evaporator which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the refrigerant | coolant which flows through the windward evaporation part of the refrigerant evaporator which concerns on 4th Embodiment. It is a schematic diagram of the refrigerating cycle which concerns on 5th Embodiment. It is sectional drawing of the windward upper tank part which concerns on other embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other may be assigned the same reference numerals and redundant description may be omitted. When only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those of the embodiment described above. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination does not hinder.

(First embodiment)
The refrigerant evaporator according to the present embodiment is applied to a vapor compression refrigeration cycle apparatus of a vehicle air conditioner that adjusts the temperature in the vehicle interior, and absorbs heat from the air blown into the vehicle interior to evaporate the refrigerant. It is a heat exchanger for cooling which cools air. In the present embodiment, the air blown into the vehicle interior corresponds to the “cooled fluid flowing outside” in the present disclosure.

As shown in FIG. 1, the refrigeration cycle apparatus 100 of the present embodiment includes a compressor 101, a condenser 102, an expansion valve 103, an accumulator 104, and the like in addition to the refrigerant evaporator 1. The compressor 101 compresses and discharges the sucked refrigerant. The condenser 102 is a radiator that radiates and condenses the gas-phase refrigerant discharged from the compressor 101. The expansion valve 103 is a decompressor that decompresses and expands the refrigerant flowing out of the condenser 102. The refrigerant evaporator 1 evaporates the refrigerant decompressed by the expansion valve 103. The accumulator 104 is disposed between the refrigerant evaporator 1 and the compressor 101, separates the refrigerant flowing out of the refrigerant evaporator 1 into a gas phase refrigerant and a liquid phase refrigerant, and supplies the separated gas phase refrigerant to the compressor 101. It is a gas-liquid separator to be inhaled.

The condenser 102 includes a condensing unit (not shown) that condenses the gas-phase refrigerant flowing out of the compressor 101, and a gas-liquid separator (not shown) that separates the gas-liquid two-phase refrigerant condensed in the condensing unit. The condenser may include a supercooling unit (not shown) that cools the liquid-phase refrigerant that has been gas-liquid separated. In this way, in the case of a refrigeration cycle apparatus having a gas-liquid separator and a condenser having a supercooling unit, the accumulator 104 may be eliminated.

As shown in FIG. 2, the refrigerant evaporator 1 of the present embodiment includes two

evaporators

10, 20, a refrigerant replacement unit 30, and a joint 40.

The two

evaporation units

10 and 20 are arranged in series with respect to the flow direction X of the air (cooled fluid) blown into the vehicle interior. In the present embodiment, of the two

evaporation units

10 and 20, the evaporation unit arranged on the windward side (upstream side) in the air flow direction is referred to as the windward evaporation unit 10, and the leeward side in the air flow direction ( The evaporator disposed on the downstream side is referred to as a leeward evaporator 20. Note that the windward evaporator 10 in the present embodiment constitutes a “second evaporator” of the present disclosure, and the leeward evaporator 20 forms a “first evaporator” of the present disclosure.

The basic configurations of the windward side evaporator 10 and the leeward side evaporator 20 are the same, and the

heat exchange cores

11 and 21 and a pair of tanks disposed on both ends of the

heat exchange cores

11 and 21 in the vertical direction, respectively.

Parts

12, 13, 22, and 23. In this 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 units

12 and 13 in the windward side evaporation unit 10, the tank unit disposed on the upper side is referred to as the windward upper tank unit 12, and the tank unit disposed on the lower side is referred to as the windward lower tank unit. 13 is called. Similarly, of the pair of

tank portions

22 and 23 in the leeward side evaporation portion 20, the tank portion disposed on the upper side is referred to as the leeward side upper tank portion 22, and the tank portion disposed on the lower side is referred to as the leeward side lower tank. This will be referred to as part 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, 212 is configured as a stacked body in which the layers are alternately stacked. Below, the lamination direction in the laminated body of the some

tubes

111 and 211 and the

several fins

112 and 212 is called a tube lamination direction. In other words, the tube stacking direction is a direction in which the plurality of

tubes

111 and 211 and the plurality of

fins

112 and 212 are stacked. The tube stacking direction is the core width direction of the heat exchange core part.

Here, as shown in FIG. 3, the windward side heat exchange core part 11 includes a first windward core part 11 a including a part of the plurality of tubes 111 and a second wind including the remaining tube group. It has the upper core part 11b. In addition, in FIG. 3, illustration of the

tubes

111 and 211 and the

fins

112 and 212 in each heat

exchange core part

11 and 21 is abbreviate | omitted. Further, the first windward core portion 11a in the present embodiment constitutes the “third core portion” of the present disclosure, and the second windward core portion 11b constitutes the “fourth core portion” of the present disclosure.

In the present embodiment, the first windward core portion 11a is configured by the tube group existing in the right half in the tube stacking direction as viewed from the air flow direction X, and is formed in the left half in the tube stacking direction as viewed from the air flow direction X. The existing wind group constitutes the second upwind core portion 11b.

Similarly, as shown in FIG. 3, the leeward side heat exchange core portion 21 includes a first leeward side core portion 21 a including a part of the tube 211 and a second tube group including the remaining tube group. It has the leeward side core part 21b. In addition, the 1st leeward side core part 21a in this embodiment comprises the "1st core part" of this indication, and the 2nd leeward side core part 21b comprises the "2nd core part" of this indication.

In the present embodiment, the first leeward side core portion 21a is configured by the tube group existing in the right half of the tube stacking direction as viewed from the air flow direction X, and the left half of the tube stacking direction is viewed from the air flow direction X. A second group of leeward cores 21b is formed by the existing tube group. In this embodiment, when viewed from the air flow direction X, the entire tube stacking direction of the first leeward core portion 11a and the entire tube stacking direction of the first leeward core portion 21a are superposed (opposed). And the entire tube stacking direction of the second leeward core portion 11b and the entire tube stacking direction of the second leeward core portion 21b are superposed (opposed).

Each

tube

111, 211 is formed with a refrigerant passage through which a refrigerant flows. Each of the

tubes

111 and 211 is a flat tube whose cross-sectional shape is a flat shape extending along the air flow direction X. The tube 111 of the windward side heat exchange core part 11 has an upper end side in the longitudinal direction connected to the windward upper tank part 12 and a lower end side in the longitudinal direction connected to the windward lower tank part 13. Further, the tube 211 of the leeward heat exchange core portion 21 has an upper end side in the longitudinal direction connected to the leeward upper tank portion 22 and a lower end side in the longitudinal direction connected to the leeward lower tank portion 23.

The

fins

112 and 212 are corrugated fins formed by bending a thin plate material into a wave. Each

fin

112, 212 is joined to the flat outer surface side of the

tubes

111, 211, and constitutes a heat exchange promoting part for expanding the heat transfer area between the air and the refrigerant.

In the laminate in which the

tubes

111 and 211 and the

fins

112 and 212 are laminated,

side plates

113 and 213 that reinforce the heat

exchange core portions

11 and 12 are disposed 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 windward upper tank portion 12 has a refrigerant outlet portion (opening portion) 12a at one end portion in the tube stacking direction, and is formed by a cylindrical member with the other end portion closed in the tube stacking direction. ing. The refrigerant outlet portion 12a constitutes a refrigerant outlet portion 12a through which the refrigerant flows out from the inside of the windward upper tank portion 12 to the outside. In this embodiment, the refrigerant | coolant exit part 12a is provided in the right end part of the windward upper tank part 12 when it sees from the flow direction X of air.

Further, as shown in FIG. 4, the windward upper tank unit 12 includes a cylindrical tank body member 121 having both ends opened, and two joining

members

122 and 123 joined to both ends of the tank body member 121. It is configured. The refrigerant outlet portion 12 a is provided in one joining member 122. FIG. 4 is a cross-sectional view of the windward upper tank portion 12 as viewed from the direction of the arrow Y in FIG. Moreover, it is good also considering the one opening edge part of the tank main body member 121 as the refrigerant | coolant exit part 12a, without using the joining member 122. FIG.

This windward upper tank section 12 is joined to each tube 111 in a state where the upper end side of each tube 111 is inserted into a through hole formed in the bottom. That is, the windward upper tank portion 12 is configured such that the internal space thereof communicates with each tube 111 of the windward heat exchange core portion 11, and from the

core portions

11 a and 11 b of the windward heat exchange core portion 11. It functions as a refrigerant collecting part that collects the refrigerant.

The leeward upper tank section 22 has a refrigerant inlet portion (opening) 22a at one end in the tube stacking direction, and the other end in the tube stacking direction is the same as the windward upper tank section 12. It is formed by a closed cylindrical member. The refrigerant inlet portion 22a constitutes a refrigerant inlet portion 22a into which the refrigerant flows from the outside to the inside of the leeward upper tank portion 22. In the present embodiment, the refrigerant inlet portion 22a is provided at the right end of the leeward upper tank portion 22 when viewed from the air flow direction X.

The leeward side upper tank portion 22 is joined to each tube 211 in a state where the upper end side of each tube 211 is inserted into a through hole formed in the bottom portion. That is, the leeward side upper tank portion 22 is configured such that the internal space thereof communicates with each tube 211 of the leeward side heat exchange core portion 21, and to the

core portions

21 a and 21 b of the leeward side heat exchange core portion 21. It functions as a refrigerant distributor that distributes the refrigerant.

As shown in FIG. 4, the windward upper tank section 12 is different from the leeward upper tank section 22 in that the first independent flow path 12 b communicating with each tube 111 constituting the first windward core section 11 a and the second It has the 2nd independent flow path 12c connected to each tube 111 which comprises the windward core part 11b.

The first and second

independent flow paths

12b and 12c are configured such that the refrigerant flowing out of the first windward core portion 11a and the refrigerant flowing out of the second windward core portion 11b are independent of each other toward the refrigerant outlet portion 12a. It is a flowing refrigerant channel. “The refrigerant and the refrigerant flow independently of each other” means that the refrigerant and the refrigerant flow without being mixed.

In the present embodiment, the first and second

independent flow paths

12b and 12c are formed by dividing the internal space of the tank body member 121 into two spaces by a partition member 124 provided inside the tank body member 121. Yes. The partition member 124 includes a first portion 124a that partitions the internal space of the tank body member 121 into an upper side and a lower side, and a second portion 124b that partitions the internal space of the tank body member 121 into one side and the other side in the tube stacking direction. . For this reason, the 1st, 2nd

independent flow path

12b, 12c is located in a line up and down.

In the present embodiment, the end of the partition member 124 on the refrigerant outlet portion 12a side is located at the open end of the tank main body member 121. Therefore, the refrigerant flowing out from the first and second

upwind core portions

11a and 11b flows through the first and second

independent flow paths

12b and 12c independently of each other up to the position of the opening end of the tank body member 121. It is configured.

The refrigerant outlet portion 12 a of the windward upper tank portion 12 is connected to the outlet side portion 41 of the joint 40. The outlet side portion 41 of the joint 40 is connected to a single refrigerant pipe (not shown) for flowing the refrigerant that has flowed out of the windward upper tank portion 12. For this reason, the internal space 41a in the outlet side portion 41 of the joint 40 communicates with the inside of a refrigerant pipe (not shown) and communicates with the first and second

independent flow paths

12b and 12c of the windward upper tank portion 12. ing.

In addition, the joint 40 is a pipe connection member for connecting the

upper tank portions

12 and 22 and the refrigerant pipe as shown in FIG. In the joint 40, an outlet side portion 41 connected to the refrigerant outlet portion 12a and an inlet side portion 42 connected to the refrigerant inlet portion 22a of the leeward side upper tank portion 22 are integrally formed. The inlet side portion 42 of the joint 40 is also connected to one refrigerant pipe for flowing the refrigerant flowing into the leeward upper tank portion 22. In this embodiment, the joint 40 in which the outlet side portion 41 and the inlet side portion 42 are integrally formed is used. However, even if the outlet side portion 41 and the inlet side portion 42 use separate joints. Good.

As shown in FIG. 3, the windward lower tank portion 13 is formed of a cylindrical member that is closed at both ends in the tube stacking direction. The windward lower tank portion 13 is joined to each tube 111 in a state where the lower end side of each tube 111 is inserted into a through hole formed in the ceiling portion. That is, the windward lower tank portion 13 is configured such that the internal space thereof communicates with each tube 111.

Moreover, a partition member 131 is disposed inside the windward lower tank portion 13 at the center position in the tube stacking direction. By this partition member 131, the tank internal space is partitioned into a space where each tube 111 constituting the first upwind core portion 11a communicates and a space where each tube 111 constituting the second upwind core portion 11b communicates. ing.

Here, in the inside of the upwind side lower tank part 13, a space communicating with each tube 111 constituting the first upwind core part 11a distributes the refrigerant to the first upwind core part 11a. The space which communicates with each tube 111 which comprises 13a and comprises the 2nd windward core part 11b comprises the 2nd refrigerant | coolant distribution part 13b which distributes a refrigerant | coolant to the 2nd windward core part 11b.

As shown in FIG. 3, the leeward side lower tank portion 23 is configured by a cylindrical member that is closed at both ends in the tube stacking direction. The leeward lower tank portion 23 is joined to each tube 211 in a state where the lower end side of each tube 211 is inserted into a through hole formed in the ceiling portion. That is, the leeward side lower tank portion 23 is configured such that its internal space communicates with each tube 211.

A partition member 231 is disposed inside the leeward side lower tank portion 23 at a central position in the tube stacking direction, and each partition 211 having the tank internal space constituting the first leeward core portion 21a by the partition member 231. Is partitioned into a space where the tubes 211 constituting the second leeward core portion 21b communicate.

Here, in the inside of the leeward side lower tank part 23, a space communicating with each tube 211 constituting the first leeward side core part 21a gathers the refrigerant from the first leeward side core part 21a. The space which comprises the part 23a and the tube 211 which comprises the 2nd leeward core part 21b communicates comprises the 2nd refrigerant | coolant collection part 23b which collects the refrigerant | coolant from the 2nd leeward core part 21b.

Each of the leeward side lower tank part 13 and the leeward side lower tank part 23 is connected via the refrigerant | coolant replacement | exchange part 30, as shown in FIG. The refrigerant replacement unit 30 guides the refrigerant in the first refrigerant collecting unit 23a in the leeward lower tank unit 23 to the second refrigerant distribution unit 13b in the leeward lower tank unit 13, and the second in the leeward lower tank unit 23. The refrigerant in the refrigerant collecting portion 23b is guided to the first refrigerant distribution portion 13a in the upwind lower tank portion 13. That is, the refrigerant replacement unit 30 switches 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 a pair of collecting

unit connecting members

31 a and 31 b connected to the first and second

refrigerant collecting units

23 a and 23 b in the leeward lower tank unit 23, and the leeward lower tank unit 13. A pair of

distributor connecting members

32a, 32b connected to each

refrigerant distributor

13a, 13b, and a pair of collecting

member connecting members

31a, 31b and a pair of distributor connecting members 32a, 32b. 33. In FIG. 3, the lengths of the connecting

members

31a, 31b, 32a, and 32b in the air flow direction X are shown in FIG. 2 so that the connecting relationship between the connecting

members

31a, 31b, 32a, and 32b can be easily understood. The length of each connecting

member

31a, 31b, 32a, 32b in the refrigerant evaporator 1 is shown.

Each of the pair of collecting

portion connecting members

31a and 31b is configured by a cylindrical member in which a refrigerant flow passage in which a refrigerant flows is formed, and one end side thereof is connected to the leeward side lower tank portion 23, The other end side is connected to the intermediate tank portion 33.

Of the pair of collecting

portion connecting members

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

Each of the pair of distribution

unit connecting members

32a and 32b is configured by a cylindrical member in which a refrigerant flow passage in which a refrigerant flows is formed, and one end side thereof is connected to the windward lower tank unit 13, The other end side is connected to the intermediate tank portion 33.

The first distribution part connection member 32a constituting one of the pair of distribution

part connection members

32a and 32b is connected to the upwind lower tank part 13 so that one end side communicates with the first refrigerant distribution part 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 distributor connecting member 32b constituting the other of the pair of

distributor connecting members

32a and 32b is connected to the upwind lower tank section 13 so that one end side thereof communicates with the second refrigerant distributing section 13b. 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. 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.

The intermediate tank portion 33 is configured by a cylindrical member whose both ends in the tube stacking direction are closed. The intermediate tank portion 33 is disposed between the leeward lower tank portion 13 and the leeward lower tank portion 23.

As shown in FIG. 5, a partition member 331 is arranged inside the intermediate tank portion 33, and the partition member 331 allows the internal space of the intermediate tank portion 33 to flow between the first refrigerant flow passage 33 a and the second refrigerant flow. It is partitioned off from the path 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.

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

As shown in FIG. 6, the gas-liquid two-phase low-pressure refrigerant decompressed by the expansion valve 103 in FIG. 1 is introduced into the leeward upper tank section 22 from the refrigerant inlet section 22 a as indicated by an arrow A. The refrigerant introduced into the leeward upper tank portion 22 descends the first leeward core portion 21a of the leeward heat exchange core portion 21 as indicated by an arrow B, and at the leeward side heat exchange core portion 21 as indicated by an arrow C. The second leeward core portion 21b is lowered.

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

The refrigerant that has flowed 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 that has flowed into the first refrigerant flow passage 33a flows into the second refrigerant distribution portion 13b of the upwind lower 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 upwind lower 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 portion 13b of the windward lower tank portion 13 ascends the second windward core portion 11b of the windward heat exchange core portion 11 as indicated by an arrow J. On the other hand, the refrigerant that has flowed into the first refrigerant distribution unit 13a ascends the first upwind core unit 11a of the upwind heat exchange core unit 11 as indicated by an arrow K.

The refrigerant that has moved up the second upwind core portion 11b flows into the second independent flow path 12c of the upwind upper tank section 12 as indicated by the arrow L, and flows through the second independent flow path 12c toward the refrigerant outlet portion 12a. On the other hand, the refrigerant that has moved up the first upwind core portion 11a flows into the first independent flow path 12b of the upwind upper tank section 12 as indicated by the arrow M, and flows through the first independent flow path 12b toward the refrigerant outlet portion 12a. Flowing. The refrigerant flowing through the first and second

independent flow paths

12b and 12c flows out of the refrigerant outlet portion 12a as indicated by an arrow N and merges in the inner space 41a of the outlet side portion 41 of the joint 40 shown in FIG. The inside of the pipe flows toward the compressor 101 in FIG.

Next, main features of this embodiment will be described.

7A and 7B are comparative examples showing the distribution of the liquid-phase refrigerant and the gas-phase refrigerant in each of the leeward-side evaporator 20 and the leeward-side evaporator 10 of the conventional refrigerant evaporator J1 when the heat load is small. FIG. On the other hand, FIGS. 8A and 8B show the distribution of the liquid-phase refrigerant and the gas-phase refrigerant in each of the leeward evaporation unit 20 and the leeward evaporation unit 10 of the refrigerant evaporator 1 of the present embodiment when the heat load is small. FIG.

In the refrigerant evaporator J1 of the comparative example, as shown in FIG. 7B, the internal space of the windward upper tank portion 12 is not partitioned, and the windward upper tank portion 12 has only one refrigerant flow path. However, this embodiment is different. In addition, the other structure of the refrigerant evaporator J1 of a comparative example is the same as this embodiment.

Under conditions where the heat load is low, for example, when the outside air temperature and the inside air temperature such as spring and autumn are relatively low, the air blown into the passenger compartment does not need to be cooled by the refrigerant evaporator. Since the refrigerant flow rate required for heat exchange is small, the flow rate of the refrigerant flowing into the leeward upper tank portion 22 from the refrigerant inlet portion 22a is low.

For this reason, in the leeward side evaporation unit 20, as shown in FIG. 7A, when the refrigerant flows into the first and second leeward

side core portions

21a and 21b from the leeward side upper tank portion 22, it is close to the refrigerant inlet portion 22a. A large amount of liquid phase refrigerant flows into the first leeward core portion 21a, and a large amount of gas phase refrigerant flows into the second leeward core portion 21b far from the refrigerant inlet portion 22a. In the upwind evaporator 10, as shown in FIG. 7B, a large amount of liquid phase refrigerant flows through the second upwind core portion 11b far from the coolant outlet portion 12a, and the first upwind core portion 11a close to the refrigerant outlet portion 12a flows into the air. A lot of phase refrigerant flows.

At this time, the windward upper tank portion 12 includes the first windward core portion in the middle of the refrigerant flow path from each communicating portion where each tube 111 constituting the second windward core portion 11b communicates to the refrigerant outlet portion 12a. Each communication part which each tube 111 which comprises 11a communicates exists. Further, in the refrigeration cycle apparatus 100 including the accumulator 104, the gas phase refrigerant and the liquid phase refrigerant are separated by the accumulator 104, and only the gas phase refrigerant flows into the compressor 101. Therefore, the refrigerant flowing out from the refrigerant evaporator J1 It may not be completely in the gas phase.

As a result, in the refrigerant evaporator J1 of the comparative example, as shown in FIG. 7B, the liquid-phase refrigerant that could not be evaporated out of the liquid-phase refrigerant that flowed into the second windward-side core part 11 b in the windward-side evaporator 10. When flowing through the inside of the windward upper tank portion 12 toward the refrigerant outlet portion 12a, it falls to the first windward core portion 11a. That is, the liquid-phase refrigerant flows backward through the area surrounded by the broken line in FIG. 7B. At this time, the force relationship between the falling liquid-phase refrigerant and the gas-phase refrigerant trying to ascend the first windward core portion 11a is balanced, and the refrigerant flow in the first windward core portion 11a stagnates or falls. The phase refrigerant flows to the windward lower tank section 13. As a result, the refrigerant stagnates inside the refrigerant evaporator J1. Since the refrigerant circulating in the refrigeration cycle contains oil for internal lubrication of the compressor 101, if the refrigerant stagnates in the refrigerant evaporator J1, the oil also stagnates and returns to the compressor 101. The amount of oil will decrease.

On the other hand, in the refrigerant evaporator 1 of the present embodiment, the windward upper tank section 12 has first and second

independent flow paths

12b and 12c. For this reason, as shown in FIGS. 8A and 8B, when the thermal load is small, in the windward upper tank portion 12, the gas-phase refrigerant flowing out from the first windward core portion 11a moves toward the refrigerant outlet portion 12a. While flowing in the 1 independent flow path 12b, the liquid phase refrigerant | coolant which flowed out from the 2nd windward core part 11b flows through the 2nd independent flow path 12c toward the refrigerant | coolant exit part 12a. That is, in the windward upper tank portion 12, the region R1 (where the liquid phase refrigerant flowing out from the second windward core portion 11b has communication portions communicating with the tubes 111 constituting the first windward core portion 11a). It flows toward the refrigerant outlet portion 12a without flowing through it (see FIG. 4).

As described above, the windward upper tank portion 12 of the present embodiment includes the first in the refrigerant flow path from the communicating portions communicating with the tubes 111 constituting the second windward core portion 11b toward the refrigerant outlet portion 12a. It has a structure in which each communicating portion communicating with each tube 111 constituting the windward core portion 11a does not exist. As a result, in the windward-side evaporator 10, the liquid-phase refrigerant that has not been completely evaporated out of the liquid-phase refrigerant that has flowed into the second windward-side core part 11b moves from the inside of the windward-side upper tank part 12 toward the refrigerant outlet part 12a. Can be prevented from falling to the first upwind core portion 11a.

Therefore, according to the present embodiment, oil stagnation inside the refrigerant evaporator 1 can be suppressed, and the amount of oil returning to the compressor 101 can be secured.

(Second Embodiment)
In the present embodiment, the configuration of the windward upper tank unit 12 is changed with respect to the refrigerant evaporator 1 of the first embodiment. Other configurations of the refrigerant evaporator 1 are the same as those in the first embodiment.

As shown in FIG. 9, the windward upper tank unit 12 of the present embodiment is configured by two separate

cylindrical members

125 and 126. The 1st cylindrical member 125 forms the 1st independent flow path 12b, and the 2nd cylindrical member 126 forms the 2nd independent flow path 12c. The first cylindrical member 125 has an opening 125a at one end in the tube stacking direction, in the present embodiment, at the right end when viewed from the air flow direction X. Similarly, the 2nd cylindrical member 126 also has the opening part 126a in the edge part of the one side in a tube lamination direction.

One end of the first and second

cylindrical members

125 and 126 in the tube stacking direction is connected to the outlet side portion 41 of the joint 40 via the joining member 122, as in the first embodiment ( (See FIG. 4). For this reason, the first and second

independent flow paths

12 b and 12 c communicate with the internal space 41 a in the outlet side portion 41 of the joint 40.

Also in the present embodiment, since the windward upper tank section 12 has the first and second

independent flow paths

12b and 12c, the same effects as in the first embodiment can be obtained.

In addition, you may connect the edge part of the 1st, 2nd

cylindrical members

125 and 126 with the exit side part 41 of the joint 40, without using the joining member 122. FIG. In this case, the

openings

125a and 126a of the first and second

cylindrical members

125 and 126 constitute the refrigerant outlet portion 12a. In this case, if the ends of the first and second

cylindrical members

125 and 126 are connected to one refrigerant pipe via a common joint, the first and second cylindrical members 125 and The

openings

125a and 126a of 126 may be separated from each other.

(Third embodiment)
In the present embodiment, the position of the refrigerant outlet portion 12a provided in the windward upper tank portion 12 is changed with respect to the refrigerant evaporator 1 of the first embodiment. Other configurations of the refrigerant evaporator 1 are the same as those in the first embodiment.

As shown in FIG. 10, in the present embodiment, the refrigerant outlet portion 12 a is provided at the left end of the windward upper tank portion 12 when viewed from the air flow direction X. In other words, as shown in FIG. 11, the refrigerant outlet portion 12 a is closer to the second windward core portion 11 b than the first windward core portion 11 a among both ends in the tube stacking direction of the windward upper tank portion 12. It is provided at the end of the side. As shown in FIG. 10, a joint 41 </ b> A is provided at the left end of the windward upper tank portion 12. The joint 41A corresponds to the outlet side portion 41 of the joint 40 of the first embodiment.

Note that, similarly to the first embodiment, the refrigerant inlet portion 22a is provided at the right end of the leeward upper tank portion 22 when viewed from the air flow direction X. In other words, as shown in FIG. 11, the refrigerant inlet portion 22a is closer to the first leeward core portion 21a than the second leeward core portion 21b among the both ends of the leeward upper tank portion 22 in the tube stacking direction. It is provided at the end of the side. As shown in FIG. 10, a joint 42 </ b> A is provided at the right end of the leeward upper tank section 22. The joint 42A corresponds to the inlet side portion 42 of the joint 40 of the first embodiment.

For this reason, in the refrigerant evaporator 1 of the present embodiment, the refrigerant flows as shown in FIG. The refrigerant flow in the present embodiment differs from the refrigerant flow of the first embodiment shown in FIG. 6 in the following points. That is, in the present embodiment, the refrigerant that has risen in the first windward core portion 11a and the second windward core portion 11b flows into the windward upper tank portion 12 as indicated by arrows O and P and travels toward the refrigerant outlet portion 12a. Then, it flows through the windward upper tank section 12 and flows out from the refrigerant outlet section 12a as indicated by an arrow Q.

As described above, in the present embodiment, the both ends of the windward upper tank portion 12 in the tube stacking direction are located on the opposite side of the leeward upper tank portion 22 from the side where the refrigerant inlet 22a is provided. A refrigerant outlet 12a is provided at the end. For this reason, the windward upper tank portion 12 of the present embodiment is configured so that the first wind is in the middle of the refrigerant flow path from each communication portion communicating with each tube 111 constituting the second windward core portion 11b toward the refrigerant outlet portion 12a. It has a structure in which each communicating portion communicating with each tube 111 constituting the upper core portion 11a does not exist.

Thus, as shown in FIGS. 12A and 12B, when the heat load is small and the refrigerant flow rate required for heat exchange is small, in the windward upper tank portion 12, the liquid phase refrigerant flowing out from the second windward core portion 11b is discharged. The refrigerant flows out directly from the refrigerant outlet portion 12a without passing through the communicating portions with the tubes 111 constituting the first windward core portion 11a in the windward upper tank portion 12. Therefore, the present embodiment can provide the same effects as those of the first embodiment.

(Fourth embodiment)
In the present embodiment, the position of the refrigerant inlet portion 22a in the leeward upper tank portion 22 and the position of the refrigerant outlet portion 12a in the leeward upper tank portion 12 are changed with respect to the refrigerant evaporator 1 of the third embodiment. . Other configurations of the refrigerant evaporator 1 are the same as those in the third embodiment.

As shown in FIG. 13A, the refrigerant inlet portion 22a is provided in a portion of the ceiling portion of the leeward upper tank portion 22 that is closer to the first leeward core portion 21a than the second leeward core portion 21b. More specifically, the refrigerant inlet portion 22a is connected to each communication portion communicating with each tube 111 constituting the second leeward core portion 21b in the leeward upper tank portion 22 in the ceiling portion of the leeward upper tank portion 22. The leeward side upper tank portion 22 is also provided at a portion close to each communicating portion communicating with each tube 111 constituting the first leeward side core portion 21a.

On the other hand, as shown in FIG. 13B, the refrigerant outlet portion 12a is provided in a portion of the ceiling portion of the windward upper tank portion 12 that is closer to the second windward core portion 11b than the first windward core portion 11a. Yes. More specifically, the refrigerant outlet portion 12a is connected to each of the communication portions communicating with the tubes 111 constituting the first upwind core portion 11a in the upwind upper tank portion 12 of the ceiling portion of the upwind upper tank portion 12. Is also provided in a portion near each communication portion communicating with each tube 111 constituting the second windward core portion 11b in the windward upper tank portion 12. Thereby, also in this embodiment, the effect similar to 1st Embodiment is acquired.

In the present embodiment, the refrigerant inlet portion 22a and the refrigerant outlet portion 12a are provided on the ceiling portion of the leeward upper tank portion 22 and the windward upper tank portion 12, but may be provided on portions other than the ceiling portion.

(Fifth embodiment)
In the present embodiment, the configuration of the refrigeration cycle apparatus is changed with respect to the first embodiment.

As shown in FIG. 14, the refrigeration cycle apparatus 200 of this embodiment includes a compressor 101, a condenser 102, an expansion valve 103, a refrigerant evaporator 1, an internal heat exchanger 105, and the like. The configuration of the refrigerant evaporator 1 is the same as that of the first embodiment.

The internal heat exchanger 105 heats the refrigerant flowing out of the refrigerant evaporator 1 by heat exchange with the refrigerant upstream of the refrigerant evaporator 1 and flows in the liquid phase contained in the refrigerant flowing out of the refrigerant evaporator 1. The refrigerant is a gas phase refrigerant, and the gas phase refrigerant is sucked into the compressor 101.

In the present embodiment, the internal heat exchanger 105 exchanges heat between the high-pressure refrigerant between the condenser 102 and the expansion valve 103 and the low-pressure refrigerant between the refrigerant evaporator 1 and the compressor 101. Further, the internal heat exchanger 105 is configured by a single double pipe having an inner pipe and an outer pipe. The inside of the inner pipe is a refrigerant flow path for low-pressure refrigerant, and the space between the inner pipe and the outer pipe is a refrigerant flow path for high-pressure refrigerant. In addition, you may employ | adopt the thing of another structure as the internal heat exchanger 105. FIG.

In the refrigeration cycle apparatus 200 of the present embodiment, the refrigerant flowing out of the refrigerant evaporator 1 is heated by the internal heat exchanger 105 to form a gas phase refrigerant, and only the gas phase refrigerant flows into the compressor 101. Therefore, the refrigerant evaporator 1 The refrigerant flowing out of the refrigerant may not be completely in the gas phase. For this reason, the problem shown to FIG. 7A and 7B tends to generate | occur | produce. Therefore, this problem can be solved by using the refrigerant evaporator 1 of the first embodiment.

The refrigeration cycle apparatus 200 of the present embodiment uses the refrigerant evaporator 1 of the first embodiment, but may use the refrigerant evaporator 1 of the second to fourth embodiments.

(Other embodiments)
The present disclosure is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present disclosure as described below.

(1) In the first embodiment, the end of the partition member 124 on the refrigerant outlet 12a side is located at the open end of the tank body member 121. However, the position of the end of the partition member 124 on the refrigerant outlet 12a side may be changed to another position. For example, a portion where the first independent flow path 12b communicates with the tube 111 closest to the refrigerant outlet portion 12a in the tube group constituting the first windward core portion 11a in the windward upper tank portion 12 is defined as a communicating portion 12d ( (See FIG. 4). In this case, the end of the partition member 124 on the refrigerant outlet portion 12a side only needs to be positioned at a predetermined position located on the refrigerant outlet portion 12a side of the communication portion 12d (see FIG. 4). In other words, the end of the partition member 124 on the refrigerant outlet portion 12a side only needs to be located at a predetermined position between the communication portion 12d and the refrigerant outlet portion 12a in the stacking direction. In FIG. 4, the open end of the tube 111 is the communication portion 12 d.

In other words, the first and second upwind core portions 11a of the first and second

independent flow paths

12b and 12c of the upwind upper tank portion 12 reach a predetermined position located closer to the refrigerant outlet portion 12a than the communication portion 12d. , 11b may be configured such that the refrigerants flowing out from 11b flow independently of each other. Thereby, the effect similar to 1st Embodiment is acquired.

(2) In each of the above-described embodiments, the example in which the refrigerant replacement unit 30 includes the pair of collecting

unit connecting members

31a and 31b, the pair of distributing

unit connecting members

32a and 32b, and the intermediate tank unit 33 has been described. However, for example, the intermediate tank part 33 of the refrigerant replacement part 30 may be eliminated, and the connecting

members

31a, 31b, 32a, 32b may be directly connected to each other.

In each of the above-described embodiments, the refrigerant replacement unit 30 is provided separately from the leeward lower tank unit 13 and the leeward lower tank unit 23. However, as described in JP 2014-13104 A, the refrigerant replacement unit 30 is provided. May be provided in the leeward side tank part 13 and the leeward side lower tank part 23.

In short, in the present disclosure, the two

evaporators

10 and 20 cause the refrigerant to flow into the first leeward core portion 21a and the second leeward core portion 21b from the leeward upper tank portion 22, and the first leeward core portion 21a. The refrigerant flowing out of the second windward core portion 11b flows into the second windward core portion 11b, and the refrigerant flowing out of the second leeward core portion 21b flows into the first windward core portion 11a. It suffices that the refrigerant that has flowed out of the two upwind core portion 11 b flows into the upwind upper tank portion 12.

(3) In each of the above-described embodiments, as the refrigerant evaporator 1, when viewed from the air flow direction X, all of the first leeward core portion 11a and all of the first leeward core portion 21a are superposed. In addition, the example in which all of the second leeward core portion 11b and all of the second leeward core portion 21b are superposed is described. However, the refrigerant evaporator 1 is arranged so that part of the first windward core portion 11a and the first leeward core portion 21a are superposed when viewed from the air flow direction X, or the second wind Alternatively, the upper core portion 11b and the second leeward core portion 21b may be arranged so as to overlap each other.

In short, when viewed from the air flow direction X, the first windward core portion 11a and the first leeward core portion 21a are arranged so that at least a part of them overlaps, and the second windward core portion 11b and second What is necessary is just to arrange | position so that at least one part of the leeward side core part 21b may superpose | polymerize.

(4) In each above-mentioned embodiment, each heat

exchange core part

11 and 21 of two

evaporation parts

10 and 20 had two core parts, but has three or more core parts. May be. Therefore, the windward heat exchange core part 11 includes a first windward core part 11a including a part of the plurality of tubes 111 and a second windward core including a tube group different from the tube group. What is necessary is just to have the part 11b. Similarly, the leeward side heat exchange core part 21 includes a first leeward side core part 21a including a part of the plurality of tubes 211 and a second leeward side including a tube group different from the tube group. What is necessary is just to have the core part 21b.

(5) Although it is desirable to arrange the windward evaporator 10 in the refrigerant evaporator 1 on the upstream side in the air flow direction X with respect to the leeward evaporator 20 as in the above embodiments, the present invention is not limited to this. The windward evaporator 10 may be disposed downstream of the leeward evaporator 20 in the air flow direction X.

(6) In each of the above-described embodiments, an example in which each heat

exchange core portion

11 and 21 includes a plurality of

tubes

111 and 211 and

fins

112 and 212 has been described. Each of the heat

exchange core parts

11 and 21 may be configured by only 111 and 211. Moreover, when each heat

exchange core part

11 and 21 is comprised only with the some

tubes

111 and 211 and the

fins

112 and 212, the

fins

112 and 212 may be not only a corrugated fin but a plate fin.

(7) In the refrigerant evaporator 1 of each of the above-described embodiments, the tube and the tank portion are configured by separate members. However, as described in Japanese Patent Application Laid-Open No. 2014-13104, the tube and the tank unit are integrated by stacking a plurality of tube units that constitute a tube and a part of the tank unit by joining a pair of core plates. A laminated structure formed in the above may be adopted.

(8) In the first embodiment, from the first independent flow path 12b and the second windward core part (fourth core part) 11b through which the refrigerant flowing out from the first windward core part (third core part) 11a passes. It is provided independently of the second independent flow path 12c through which the refrigerant that has flowed out passes. However, even if the oil contained in the refrigerant that has flowed out of the second windward core portion 11b flows into the first windward core portion 11a as long as it is an amount that can suppress the occurrence of seizure of the compressor 101. Good.

For example, as shown in FIG. 15, the partition member 124 may include a first portion 124c and a second portion 124d. The first portion 124c partitions the internal space of the tank body member 121 into an upper side and a lower side. The second portion 124d partitions the internal space of the tank body member 121 into one side and the other side in the tube stacking direction. Inside the windward upper tank 12, the partition member 124 allows the refrigerant flowing out from the first windward core 11 a to flow to the refrigerant outlet 12 a, and flows out from the second windward core 11 b. A second flow path 12f that guides the refrigerant to the refrigerant outlet 12a is formed.

In such a structure, even if the communication hole 124e is formed in the first portion 124a of the partition member 124, it is included in the refrigerant flowing from the second flow path 12f to the first flow path 12e through the communication hole 124e. It suffices that the amount of oil to be produced is such that the occurrence of baking of the compressor 101 can be suppressed. The communication hole 124e may be formed in the second portion 124b of the partition member 124.

(9) In each of the above-described embodiments, 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. May be.

The above embodiments are not irrelevant to each other and can be appropriately combined except when the combination is clearly impossible. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

Claims

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 (X) of the fluid to be cooled;
Each of the first evaporator and the second evaporator is
A heat exchange core portion (11, 21) configured by laminating a plurality of tubes (111, 211) extending in the vertical direction and through which the refrigerant flows;
An upper tank part (12, 22) and a lower tank part (13, 23) that are arranged on both ends in the vertical direction of the plurality of tubes and collect or distribute the refrigerant flowing through the plurality of tubes;
The heat exchange core section (21) of the first evaporation section includes a first core section (21a) including a part of the plurality of tubes (211) and a tube group different from the tube group. A second core portion (21b) including
The heat exchange core part (11) of the second evaporation part is
A third core portion (11a) including a tube group facing at least a part of the first core portion in the flow direction of the fluid to be cooled among the plurality of tubes (111);
A fourth core portion (11b) including a tube group facing at least a part of the second core portion in the flow direction of the fluid to be cooled;
The upper tank part (22) of the first evaporation part has the first evaporation part at an end part closer to the first core part than the second core part among both end parts in the stacking direction of the tubes. A refrigerant inlet portion (22a) into which the refrigerant flows into the upper tank portion of
The upper tank part (12) of the second evaporation part has the second evaporation part at an end part closer to the third core part than the fourth core part among both end parts in the stacking direction of the tubes. A refrigerant outlet part (12a) through which the refrigerant flows out from the inside of the upper tank part of
The first evaporator and the second evaporator are configured such that the refrigerant flows into the first core and the second core from the upper tank of the first evaporator, and the refrigerant that flows out of the first core is The refrigerant flowing into the fourth core portion and flowing out from the second core portion flows into the third core portion, and then the refrigerant flowing out from the third core portion and the fourth core portion is subjected to the second evaporation. Configured to flow into the upper tank part of the part,
The upper tank section of the second evaporation section includes a first independent flow path (12b) in which the refrigerant flowing out from the third core section and the refrigerant flowing out from the fourth core section flow independently from each other toward the refrigerant outlet section. ) And a second independent flow path (12c),
The first independent flow path and the second independent flow path communicate with the tube closest to the refrigerant outlet portion in the tube group constituting the third core portion in the upper tank portion of the second evaporation portion. A refrigerant evaporator configured such that the refrigerant flowing out of the third and fourth core parts flows independently from each other up to a predetermined position located closer to the refrigerant outlet part than the communication part (12d).
The upper tank part of the second evaporation part is
A tubular tank body member (121);
A partition member (124) provided inside the tank body member,
2. The refrigerant evaporator according to claim 1, wherein the first and second independent flow paths are formed by the partition member partitioning an internal space of the tank body member into two spaces.
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 (X) of the fluid to be cooled;
Each of the first evaporator and the second evaporator is
A heat exchange core portion (11, 21) configured by laminating a plurality of tubes (111, 211) extending in the vertical direction and through which the refrigerant flows;
An upper tank part (12, 22) and a lower tank part (13, 23) that are arranged on both ends in the vertical direction of the plurality of tubes and collect or distribute the refrigerant flowing through the plurality of tubes;
The heat exchange core section (21) of the first evaporation section includes a first core section (21a) including a part of the plurality of tubes (211) and a tube group different from the tube group. A second core portion (21b) including
The heat exchange core part (11) of the second evaporation part is
A third core portion (11a) including a tube group facing at least a part of the first core portion in the flow direction of the fluid to be cooled among the plurality of tubes (111);
A fourth core part (11b) including a tube group facing at least a part of the second core part in the flow direction of the fluid to be cooled;
The upper tank part (22) of the first evaporation part is a refrigerant inlet part into which a refrigerant flows into the upper tank part of the first evaporation part at a position closer to the first core part than the second core part. Is provided,
The first evaporator and the second evaporator are configured such that the refrigerant flows into the first core and the second core from the upper tank of the first evaporator, and the refrigerant that flows out of the first core is The refrigerant flowing into the fourth core portion and flowing out from the second core portion flows into the third core portion, and then the refrigerant flowing out from the third core portion and the fourth core portion is subjected to the second evaporation. Configured to flow into the upper tank section (12) of the section,
The upper tank part of the second evaporation part has a refrigerant outlet part (12a) through which the refrigerant flows out from the inside of the upper tank part of the second evaporation part at a position closer to the fourth core part than the third core part. A refrigerant evaporator.
The refrigerant inlet portion is provided at an end portion closer to the first core portion than the second core portion among both end portions of the upper tank portion of the first evaporation portion in the tube stacking direction. ,
The refrigerant outlet portion is provided at an end portion closer to the fourth core portion than the third core portion among both end portions in the tube stacking direction of the upper tank portion of the second evaporation portion. The refrigerant evaporator according to claim 3.
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 (X) of the fluid to be cooled;
Each of the first evaporator and the second evaporator is
A heat exchange core portion (11, 21) configured by laminating a plurality of tubes (111, 211) extending in the vertical direction and through which the refrigerant flows;
An upper tank part (12, 22) and a lower tank part (13, 23) that are arranged on both ends in the vertical direction of the plurality of tubes and collect or distribute the refrigerant flowing through the plurality of tubes;
The heat exchange core section (21) of the first evaporation section includes a first core section (21a) including a part of the plurality of tubes (211) and a tube group different from the tube group. A second core portion (21b) including
The heat exchange core part (11) of the second evaporation part is
A third core portion (11a) including a tube group facing at least a part of the first core portion in the flow direction of the fluid to be cooled among the plurality of tubes (111);
A fourth core portion (11b) including a tube group facing at least a part of the second core portion in the flow direction of the fluid to be cooled;
The upper tank part (22) of the first evaporation part has the first evaporation part at an end part closer to the first core part than the second core part among both end parts in the stacking direction of the tubes. A refrigerant inlet portion (22a) into which the refrigerant flows into the upper tank portion of
The upper tank part (12) of the second evaporation part has the second evaporation part at an end part closer to the third core part than the fourth core part among both end parts in the stacking direction of the tubes. A refrigerant outlet part (12a) through which the refrigerant flows out from the inside of the upper tank part of
The first evaporator and the second evaporator are configured such that the refrigerant flows into the first core and the second core from the upper tank of the first evaporator, and the refrigerant that flows out of the first core is The refrigerant flowing into the fourth core portion and flowing out from the second core portion flows into the third core portion, and then the refrigerant flowing out from the third core portion and the fourth core portion is subjected to the second evaporation. Configured to flow into the upper tank part of the part,
The upper tank part of the second evaporation part is
A first flow path (12e) for guiding the refrigerant flowing out of the third core part toward the refrigerant outlet part;
A second flow path (12f) for guiding the refrigerant flowing out of the fourth core portion toward the refrigerant outlet portion,
The first flow path and the second flow path communicate with each other so that the tube closest to the refrigerant outlet portion in the tube group constituting the third core portion communicates with the upper tank portion of the second evaporation portion. A refrigerant evaporator configured to allow the refrigerant flowing out of the third and fourth core parts to flow to a predetermined position located closer to the refrigerant outlet part than the part (12d).
A compressor (101) for compressing and discharging the sucked refrigerant;
A radiator (102) for dissipating heat from the refrigerant discharged from the compressor;
A decompressor (103) for decompressing the refrigerant flowing out of the radiator;
A refrigerant evaporator (1) for evaporating the refrigerant decompressed by the decompressor;
A gas-liquid separator (104) for separating the refrigerant flowing out of the refrigerant evaporator into a gas-phase refrigerant and a liquid-phase refrigerant, and sucking the separated gas-phase refrigerant into the compressor;
The refrigeration cycle apparatus, wherein the refrigerant evaporator is the refrigerant evaporator according to any one of claims 1 to 5.
A compressor (101) for compressing and discharging the sucked refrigerant;
A radiator (102) for dissipating heat from the refrigerant discharged from the compressor;
A decompressor (103) for decompressing the refrigerant flowing out of the radiator;
A refrigerant evaporator (1) for evaporating the refrigerant decompressed by the decompressor;
An internal heat exchanger (105) for heating the refrigerant flowing out of the refrigerant evaporator by heat exchange with the refrigerant upstream of the refrigerant evaporator and flowing the refrigerant to the compressor; ,
The refrigeration cycle apparatus, wherein the refrigerant evaporator is the refrigerant evaporator according to any one of claims 1 to 5.
A compressor (101) for compressing and discharging the sucked refrigerant;
A radiator (102) for dissipating heat from the refrigerant discharged from the compressor;
A decompressor (103) for decompressing the refrigerant flowing out of the radiator;
A refrigerant evaporator (1) for evaporating the refrigerant decompressed by the decompressor,
The refrigeration cycle apparatus, wherein the refrigerant evaporator is the refrigerant evaporator according to any one of claims 1 to 5.