JP2017003140A - Refrigerant evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant evaporator capable of suppressing deterioration in distributivity of refrigerant.SOLUTION: A refrigerant evaporator 1 is configured such that refrigerant in a first relay flow passage 33a and a second relay flow passage 33b outflows to a first outflow flow passage 32b and a second outflow flow passage 32a while flowing from one end side toward the other end side. In each of the first outflow flow passage 32b and second outflow flow passage 32a, a first outflow region where refrigerant is hard to outflow is formed on the one end side, and a second outflow region where refrigerant is easy to outflow is formed to the other end side with respect to the first outflow region.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a refrigerant evaporator that performs heat exchange between a fluid to be cooled flowing outside and a refrigerant.

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

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

  In the refrigerant evaporator disclosed in 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 to each other. 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. In the refrigerant evaporator, the refrigerant flowing on one side in the width direction of the heat exchange core part of the first evaporation part is transferred to the other side in the width direction of the heat exchange core part of the second evaporation part by one of the communication parts. 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.

Japanese Patent No. 4124136

  However, as in the refrigerant evaporator disclosed in Patent Document 1, if the refrigerant flow direction is switched by a pair of communicating parts that connect one tank part of each evaporation part, heat exchange of the first evaporation part When the refrigerant from the core part flows to the heat exchange core part of the second evaporation part, the liquid phase refrigerant may be distributed to a part of the heat exchange core part of the second evaporation part.

  Specifically, the liquid phase refrigerant flowing from the heat exchange core part of the first evaporation part to the heat exchange core part of the second evaporation part is the second of the tube group constituting the heat exchange core part of the second evaporation part. There is a tendency to flow easily to a tube located near a connection point (a refrigerant outlet in the communication part) with each communication part in one tank part of the evaporation part, and liquid phase refrigerant is applied to a tube far from the connection part. It cannot flow sufficiently.

  Thus, when the distribution property of the liquid phase refrigerant in the refrigerant evaporator deteriorates, a region where heat exchange between the fluid to be cooled and the refrigerant is not effectively performed occurs in the heat exchange core portion of the second evaporation unit, and the refrigerant evaporation There is a problem that the cooling performance of the vessel is lowered.

  This invention is made | formed in view of such a subject, The objective is to provide the refrigerant | coolant evaporator which can suppress the deterioration of the distribution of a refrigerant | coolant.

  In order to solve the above problems, a refrigerant evaporator according to the present invention is a refrigerant evaporator (1) that performs heat exchange between a cooled fluid that flows outside and a refrigerant, and the flow direction of the cooled fluid Are provided with a first evaporator (20) and a second evaporator (10) arranged in series. The first evaporator and the second evaporator are respectively a heat exchange core (11, 21) configured by stacking a plurality of tubes (111, 211) through which a refrigerant flows, and both ends of the plurality of tubes. And a pair of tank parts (12, 13, 22, 23) for collecting or distributing refrigerant flowing through the plurality of tubes. The heat exchange core part (21) in the first evaporation part is at least one of a first core part (21a) constituted by a part of the tube groups of the plurality of tubes (211) and a remaining tube group. It has the 2nd core part (21b) comprised by a one part tube group. The heat exchange core part (11) in the second evaporation part is composed of a tube group facing at least a part of the first core part composed of a part of the plurality of tubes (211). And a fourth core portion (11b) constituted by at least a part of the tube group among the third core portion (11a) and the remaining tube group. Of the pair of tank parts (22, 23) in the first evaporation part, one tank part (23) is a first refrigerant assembly part (23a) for collecting refrigerant from the first core part, the first The second refrigerant assembly part (23b) that collects the refrigerant from the two core parts (21b) is included. Of the pair of tank parts (12, 13) in the second evaporation part, one tank part (13) is a first refrigerant distribution part (13a) for distributing refrigerant to the third core part, and the fourth A second refrigerant distribution part (13b) for distributing the refrigerant to the core part (11b) is included. The first evaporating unit and the second evaporating unit include a first communication unit (31a, 32b, 33a) for guiding the refrigerant of the first refrigerant collecting unit to the second refrigerant distributing unit, and the second refrigerant collecting unit. The refrigerant is connected via a refrigerant replacement section (30) having a second communication section (31b, 32a, 33b) for guiding the refrigerant to the first refrigerant distribution section. The refrigerant replacement part has an intermediate tank part (33), the intermediate tank part is connected to the first refrigerant assembly part via a refrigerant first inflow channel (31a), and the second The refrigerant distribution section is connected to the first relay flow path (33a) through the refrigerant first outflow path (32b), and the second refrigerant assembly section is connected through the refrigerant second inflow path (31b). The first refrigerant distribution section includes a second relay flow path (33b) connected via a refrigerant second outflow path (32a). In the first relay channel and the second relay channel, the refrigerant flows out from the one end side toward the other end side so as to flow out into the first outflow channel and the second outflow channel. . In each of the first outflow channel and the second outflow channel, a first outflow region where the refrigerant does not easily flow out is formed on the one end side, and the refrigerant is disposed on the other end side of the first outflow region. A second outflow region that easily flows out is formed.

  According to the present invention, the first outflow channel and the second outflow channel each have the first outflow region where the refrigerant hardly flows out on the one end wall side, and the other end wall from the first outflow region. Since the 2nd outflow area where a refrigerant | coolant tends to flow out is formed in the part side, the deterioration of the distribution property of a refrigerant | coolant can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerant evaporator which can suppress the deterioration of the distribution property of a refrigerant | coolant can be provided.

FIG. 1 is a schematic perspective view of a refrigerant evaporator according to the present embodiment. FIG. 2 is an exploded perspective view of the refrigerant evaporator according to the present embodiment. FIG. 3 is a diagram for explaining the flow of the refrigerant in the refrigerant evaporator according to the present embodiment. FIG. 4 is a schematic diagram for explaining the shape of the flow path connecting the intermediate tank portion to the windward heat exchange core portion in the refrigerant evaporator according to the present embodiment. As a comparative example, it is the schematic for demonstrating the shape of the flow path connected from an intermediate | middle tank part to an upwind heat exchange core part. It is a figure for demonstrating distribution of the liquid phase refrigerant | coolant which flows through each heat exchange core part of the refrigerant evaporator which concerns on a comparative example. It is a figure for demonstrating distribution of the liquid phase refrigerant | coolant which flows through each heat exchange core part of the refrigerant evaporator which concerns on this embodiment. It is a figure for demonstrating the modification of the flow-path shape connected to an upwind heat exchange core part from an intermediate | middle tank part.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  The refrigerant evaporator 1 according to the present embodiment shown in FIG. 1 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. It is a cooling heat exchanger that cools blown air by evaporating (liquid phase refrigerant). In the present embodiment, the blown air corresponds to the “cooled fluid flowing outside” in the claims.

  In addition to the refrigerant evaporator 1, the refrigeration cycle includes a compressor, a radiator (condenser), an expansion valve, and the like (not shown). In this embodiment, a liquid receiver is disposed between the radiator and the expansion valve. It is configured as a receiver cycle.

  FIG. 1 is a schematic perspective view of a refrigerant evaporator 1 according to this embodiment, and FIG. 2 is an exploded perspective view of the refrigerant evaporator 1 shown in FIG. In FIG. 2, illustration of tubes 111 and 211 and fins 112 and 212 in each heat exchange core portion 11 and 21 described later is omitted.

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

  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 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 portions 12 and 13 in the windward side evaporation unit 10, the tank portion disposed on the upper side is referred to as a first windward tank portion 12, and the tank portion disposed on the lower side is referred to as the second windward side. This is referred to as a tank portion 13. Similarly, of the pair of tank parts 22 and 23 in the leeward side evaporation part 20, the tank part arranged on the upper side is referred to as the first leeward side tank part 22, and the tank part arranged on the lower side is referred to as the second leeward side. This is referred to as a side tank portion 23.

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

  Here, the windward heat exchange core portion 11 includes a first windward core portion 11a composed of a part of the plurality of tubes 111 and a second windward core composed of the remaining tube groups. It has a portion 11b. In addition, the 1st windward core part 11a in this embodiment comprises the "3rd core part" in a claim, and the 2nd windward core part 11b is the "4th core part" in a claim. Configure.

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

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

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

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

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

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

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

  The first upwind tank unit 12 is closed at one end (the left end when viewed from the flow direction of the blown air) and at the other end (the right end when viewed from the flow direction of the blown air). Further, it is constituted by a cylindrical member in which a refrigerant outlet 12a for leading out 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. The first upwind tank section 12 is configured such that the internal space thereof communicates with each tube 111 of the upwind heat exchange core section 11, and the first upwind tank section 12 is connected to each of the core sections 11 a and 11 b of the upwind heat exchange core section 11. It functions as a refrigerant collecting part for collecting refrigerant.

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

  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 constitutes the first upwind core unit 11 a by the partition member 131. It is partitioned into a space where the tubes 111 communicate with each other and a space where the tubes 111 constituting the second upwind core portion 11b communicate.

  Here, in the inside of the second upwind tank section 13, the space communicating with each tube 111 constituting the first upwind core section 11a distributes the refrigerant to the first upwind core section 11a. The space which comprises the part 13a and is connected to each tube 111 which 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.

  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 portion 23, a partition member 231 is disposed at a central position in the longitudinal direction, and by this partition member 231, each tube 211 whose tank internal space constitutes the first leeward core portion 21a. Is partitioned into a space where the tubes 211 constituting the second leeward core portion 21b communicate.

  Here, in the inside of the second leeward side tank portion 23, the space that communicates with the respective tubes 211 constituting the first leeward side core portion 21a collects the refrigerant from the first leeward side core portion 21a. A space that constitutes the collecting portion 23a and communicates with each of the tubes 211 constituting the second leeward core portion 21b constitutes a second refrigerant collecting portion 23b that collects the refrigerant from the second leeward core portion 21b.

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

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

  Each of the pair of assembly portion connecting members 31a and 31b is configured by a cylindrical member in which a refrigerant passage through which a refrigerant flows is formed, and one end side thereof is connected to the second leeward tank portion 23, The other end side is connected to the intermediate tank portion 33. The collective portion connecting member 31a in the present embodiment constitutes the “first inflow passage” in the claims, and the collective portion connecting member 31b constitutes the “second inflow passage” in the claims. Yes.

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

  Further, the second collecting portion connecting member 31b constituting the other is connected to the second leeward tank portion 23 so that one end side thereof communicates with the second refrigerant collecting portion 23b, and the other end side is an intermediate tank portion 33 described later. It is connected to the intermediate tank portion 33 so as to communicate with the inner second refrigerant passage 33b. The second refrigerant passage 33b in the present embodiment constitutes a “second relay flow path” in the claims.

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

  Each of the pair of distribution unit connecting members 32a and 32b is configured by a cylindrical member in which a refrigerant passage through which a refrigerant flows is formed, and one end side thereof is connected to the second upwind tank unit 13, The other end side is connected to the intermediate tank portion 33. The distribution part connection member 32a in the present embodiment constitutes the “second outflow channel” in the claims, and the distribution part connection member 32b constitutes the “first outflow channel” in the claims. Yes.

  Of the pair of distributor connecting members 32a and 32b, the first distributor connecting member 32a constituting one is connected to the second windward tank 13 so that one end side thereof communicates with the first refrigerant distributor 13a. The other end is connected to the intermediate tank 33 so as to communicate with a second refrigerant passage 33b in the intermediate tank 33 described later. In other words, the first distribution part connecting member 32 a communicates with the above-described second collecting part connecting member 31 b via the second refrigerant passage 33 b of the intermediate tank part 33.

  Of the pair of distribution unit coupling members 32a and 32b, the second distribution unit coupling member 32b constituting the other is connected to the second upwind tank unit 13 so that one end side communicates with the second refrigerant distribution unit 13b. The other end side is connected to the intermediate tank portion 33 so as to communicate with a first refrigerant 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 passage 33 a of the intermediate tank part 33.

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

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

  In each core part 11a, 11b in the windward heat exchange core part 11, the refrigerant hardly flows to the tube located on the end side in the stacking direction among the plurality of tubes 111 constituting each core part 11a, 11b. There is a tendency that distribution is bad.

  Specifically, in the first upwind core portion 11a, the tube 111 located near the closed end of the first refrigerant distribution portion 13a of the second upwind tank portion 13 and the tube located near the partition member 131. There is a tendency that the refrigerant does not easily flow in 111. In the second upwind core portion 11b, the tube 111 located near the closed end of the second refrigerant distribution portion 13b of the second upwind tank portion 13 and the tube 111 located near the partition member 131 receive refrigerant. Tend to be difficult to flow.

  Therefore, in the present embodiment, each distribution part connecting member 32a, 32b is configured to open so as to face a tube located on one end side in the stacking direction among the plurality of tubes 111 constituting the first upwind core part 11a. It is said.

  4A and 4B are diagrams showing the flow of the refrigerant in the vicinity of the first distributor connecting member 32a and the second distributor connecting member 32b. FIG. 4A is a schematic cross-sectional view, and FIG. A side view is shown. As shown in FIG. 4, with respect to the first distribution part connecting member 32a, the opening thereof faces the tube located on one end side in the stacking direction among the plurality of tubes 111 constituting the first upwind core part 11a. The first refrigerant distribution part 13a is connected to a position close to the closed end of the second upwind tank part 13 so as to open. The 1st distribution part connection member 32a is connected with side wall part 33ba of the 2nd refrigerant passage 33b. The 1st distribution part connection member 32a is provided near the one end wall part 33bb of the 2nd refrigerant passage 33b, and separated from the other end wall part 33bc.

  The refrigerant that flows into the second refrigerant passage 33b through the second collecting portion connecting member 31b flows into the other end wall portion 33bc side. The refrigerant flowing into the other end wall portion 33bc flows toward the one end wall portion 33bb, hits the one end wall portion 33bb, changes its flow, and flows along the side wall portion 33ba from the one end wall portion 33bb toward the other end wall portion 33bc. However, it is configured to flow out to the first distributor connecting member 32a. Focusing on this refrigerant outflow stage, the refrigerant flows in the second refrigerant flow path 33b, which is the second relay flow path, from the one end wall part 33bb which is one end side toward the other end wall part bc which is the other end side. It flows out to the 1st distribution part connection member 32a which is the 2nd outflow channel.

  In the case of the present embodiment, the first distribution portion connecting member 32a has one end wall portion 33bb side which is one end side narrower than the refrigerant flow direction and the other end wall portion 33bc side which is the other end side is wider. It is configured. With such a configuration, the first distribution portion connecting member 32a is formed with a first outflow region in which the refrigerant does not easily flow out on the one end wall portion 33bb side, which is one end side, and the other end than the first outflow region. A second outflow region where the refrigerant easily flows out is formed on the other end wall portion 33bc side.

  On the other hand, about the 2nd distribution part connection member 32b, 2nd refrigerant | coolant distribution so that it may open and oppose the tube located in the lamination direction one end among the some tubes 111 which comprise the 2nd windward core part 11b. The part 13b is connected to a position close to the partition member 131.

  The 2nd distribution part connection member 32b is connected with side wall part 33aa of the 1st refrigerant passage 33a. The second distribution portion connecting member 32b is provided close to the one end wall portion 33ab of the first refrigerant passage 33a and separated from the other end wall portion 33ac.

  The refrigerant flowing into the first refrigerant passage 33a through the first collecting portion connecting member 31a flows into the one end wall portion 33ab. The refrigerant flowing into the one end wall portion 33ab flows toward the other end wall portion 33ac, and flows into the second distribution portion connecting member 32b while flowing from the one end wall portion 33ab toward the other end wall portion 33ac along the side wall portion 33aa. It is configured to flow out. Focusing on this refrigerant outflow stage, the refrigerant flows in the first refrigerant flow path 33a, which is the first relay flow path, from the one end wall section 33ab which is one end side toward the other end wall section ac which is the other end side. It flows out to the 2nd distribution part connection member 32b which is the 1st outflow channel.

  In the case of the present embodiment, the second distribution portion connecting member 32b is configured such that the one end wall portion 33ab side, which is one end side, is narrow in the refrigerant flow direction, and the other end wall portion 33ac side, which is the other end side, is wide. It is configured. With such a configuration, the second distribution portion connecting member 32b is formed with a first outflow region where the refrigerant does not easily flow out on the one end wall portion 33ab side, which is one end side, and the other end than the first outflow region. The second outflow region where the refrigerant easily flows out is formed on the other end wall portion 33ac side.

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

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

  Here, in the present embodiment, the first refrigerant passage 33a in the first collecting portion connection member 31a, the second distribution portion connection member 32b, and the intermediate tank portion 33 is the “first communication portion” described in the claims. It is composed. The first collecting portion connecting member 31a corresponds to the “refrigerant inlet” in the “first communicating portion”, and the second distributing portion connecting member 32b corresponds to the “refrigerant outlet” in the “first communicating portion”. doing.

  The second collecting portion connecting member 31b, the first distributing portion connecting member 32a, and the second refrigerant passage 33b in the intermediate tank portion 33 constitute a “second communicating portion” described in the claims. The second collecting portion connecting member 31b corresponds to a “refrigerant inlet” in the “second communicating portion”, and the first distributing portion connecting member 32a corresponds to a “refrigerant outlet” in the “second communicating portion”. doing.

  Next, the flow of the refrigerant in the refrigerant evaporator 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining the flow of the refrigerant in the refrigerant evaporator 1 according to the present embodiment.

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

  The refrigerant descending the first leeward 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 core portion 21 b flows into the second refrigerant collecting portion 23 b of the second leeward 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 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 passage 33b of the intermediate tank portion 33 through the second collecting portion connecting member 31b as indicated by an arrow G.

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

  The refrigerant that has flowed into the second refrigerant distribution unit 13b of the second upwind tank unit 13 moves up the second upwind 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 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 rising up the second windward core portion 11b and the refrigerant rising up the first windward core portion 11a flow into the tank of the first windward tank portion 12 as indicated by arrows L and M, respectively. As described above, the refrigerant is led out to the compressor (not shown) suction side from the refrigerant outlet 12a formed on one end side of the first upwind tank section 12.

  In the refrigerant evaporator 1 according to the present embodiment described above, the opening width in the direction intersecting the tube stacking direction of the distribution unit connecting members 32a and 32b constituting the refrigerant outlet of each communication unit in the refrigerant replacement unit 30 is as follows. The opening portion is provided so that a portion wider on the downstream side than on the upstream side in the refrigerant flow is formed.

  This suppresses the bias in the distribution of the liquid-phase refrigerant from the respective refrigerant distributors 13a and 13b of the second upwind tank unit 13 to the respective cores 11a and 11b of the upwind heat exchange core unit 11 in the upwind evaporator 10. can do. As a result, it is possible to suppress a decrease in the cooling performance of the blown air in the refrigerant evaporator 1.

  Here, FIG. 6 shows the heat exchanger core parts 11 and 21 of the refrigerant evaporator 1 according to the comparative example (having the distributor connecting members 32aF and 32bF whose opening width does not change as shown in FIG. 5). FIG. 7 is an explanatory diagram for explaining the distribution of the liquid phase refrigerant flowing through the refrigerant, and FIG. 7 is a diagram for explaining the distribution of the liquid phase refrigerant flowing through the heat exchange core portions 11 and 21 of the refrigerant evaporator 1 according to the present embodiment. It is explanatory drawing of. Note that the widths Lb1 and Lb2 of the distribution unit connecting members 32a and 32b of the present embodiment and the widths Lb1 and Lb2 of the distribution unit connecting members 32aF and 32bF of the comparative example are the same width.

  FIGS. 6 (A) and 7 (A) show the distribution of the liquid-phase refrigerant flowing through the windward heat exchange core unit 11, and FIGS. 6 (B) and 7 (B) show the leeward heat exchange core unit 21. 6 (C) and FIG. 7 (C) show the synthesis of the distribution of the liquid phase refrigerant flowing through the heat exchange core portions 11 and 21. FIG. 6 and 7 show the distribution of the liquid-phase refrigerant when the refrigerant evaporator 1 is viewed from the direction of arrow Y in FIG. 1 (the direction opposite to the flow direction Y of the blown air). A portion indicated by a portion indicates a portion where the liquid-phase refrigerant exists.

  First, regarding the distribution of the liquid-phase refrigerant flowing through the leeward heat exchange core section 21, as shown in FIGS. 6B and 7B, the refrigerant evaporator 1 according to the comparative example and the refrigerant according to the present embodiment. The same applies to the evaporator 1, and when the flow rate of the refrigerant is low, a portion where the liquid refrigerant is difficult to flow (a white portion on the lower right side in the figure) is generated in a part of the second leeward core portion 21b.

  On the other hand, regarding the distribution of the liquid-phase refrigerant flowing through the windward heat exchange core unit 11 in the refrigerant evaporator 1 according to the comparative example, as shown in FIG. In the portions 11a and 11b, in the tube stacking direction, the liquid-phase refrigerant easily flows on the side where the distribution unit connection members 32aF and 32bF are formed, and the liquid-phase refrigerant on the side where the distribution unit connection members 32aF and 32bF are not formed. Is difficult to flow.

  As shown in FIG. 6C, when the refrigerant evaporator 1 according to the comparative example is viewed from the flow direction X of the blown air, the polymerization in the second windward core portion 11b and the second leeward core portion 21b. A portion where the liquid-phase refrigerant is difficult to flow (a white portion on the right side in the figure) is generated in a part of the portion to be performed.

  As described above, in the refrigerant evaporator 1 according to the comparative example in which the liquid-phase refrigerant is distributed, the refrigerant can sufficiently cool the blown air only by absorbing the sensible heat from the blown air at the location where the liquid-phase refrigerant is difficult to flow. Can not. As a result, a temperature distribution is generated in the blown air passing through the refrigerant evaporator 1.

  On the other hand, with respect to the distribution of the liquid-phase refrigerant flowing through the windward heat exchange core portion 11 in the refrigerant evaporator 1 according to the present embodiment, the opening width in the direction intersecting the tube stacking direction of the distribution portion connecting members 32a and 32b. 7A, as shown in FIG. 7A, the liquid-phase refrigerant flows evenly in the tube stacking direction in each of the windward core portions 11a and 11b of the windward heat exchange core portion 11. It is easy. That is, in the refrigerant evaporator 1 according to the present embodiment, the uneven distribution of the liquid-phase refrigerant to the core parts 11a and 11b of the windward heat exchange core part 11 is suppressed.

  And when the refrigerant evaporator 1 which concerns on this embodiment is seen from the flow direction X of blowing air, as shown in FIG.8 (C), in the 2nd windward side core part 11b and the 2nd leeward side core part 21b. A liquid-phase refrigerant flows over the entire region to be polymerized.

  In the refrigerant evaporator 1 according to the present embodiment in which the liquid-phase refrigerant is distributed in this way, the refrigerant absorbs sensible heat and latent heat from the blown air by any of the heat exchange core parts 11 and 21, and thus the blown air is used. Sufficient cooling is possible. As a result, the temperature distribution in the blown air passing through the refrigerant evaporator 1 is suppressed.

  By the way, the shape of each distribution part connection member 32a, 32b is not restricted to the shape demonstrated above, The front flow side (one end wall 33ab, 33bb) of the refrigerant | coolant flow direction of the vicinity which flows into each distribution part connection member 32a, 32b The first outflow region where the refrigerant does not flow easily is formed on the side), and the second outflow region where the refrigerant easily flows can be formed on the rear flow side (the other end walls 33ac, 33bc side).

  FIG. 8 shows the first distributor connecting member 32a in (A), and its modifications are shown in (B) to (G). Although the first distributor connecting member 32a will be described as an example, the same applies to the second distributor connecting member 32b.

  In (B), 1st distribution part connection member 32aA which has outflow area | region 32aAa, outflow area | region 32aAb, and outflow area | region 32aAc is shown. The flow passage cross-sectional area of each outflow region is the narrowest in the outflow region 32aAa and the widest in the outflow region 32aAc. Accordingly, the outflow region 32aAa is formed as the first outflow region, and the outflow region 32aAc is formed as the second outflow region. The cross-sectional area of the outflow region 32aAb is set in the middle between the outflow region 32aAa and the outflow region 32aAc, but may be substantially the same as any of the cross-sectional areas of the flow regions or may be narrower than the outflow region 32aAa. .

  In (C), the 1st distribution part connection member 32aB which has outflow area 32aBa and outflow area 32aBb is shown. The outflow region 32aBa is narrow and the outflow region 32aBb is wide. Accordingly, the outflow region 32aBa is formed as the first outflow region, and the outflow region 32aBb is formed as the second outflow region.

  In (D), the 1st distribution part connection member 32aC which has outflow area | region 32aCa, outflow area | region 32aCb, and outflow area | region 32aCc is shown. The flow passage cross-sectional area of each outflow region is the narrowest in the outflow region 32aCa and the widest in the outflow region 32aCc. Accordingly, the outflow region 32aCa is formed as the first outflow region, and the outflow region 32aCc is formed as the second outflow region. The cross-sectional area of the outflow region 32aCb is set in the middle between the outflow region 32aCa and the outflow region 32aCc. . In addition, when the cross-sectional area of the outflow region 32aCb is set between the outflow region 32aCa and the outflow region 32aCc, the outflow region 32aCb is formed as the second outflow region in relation to the outflow region 32aCa. In relation to the outflow region 32aCc, the outflow region 32aCb is formed as the first outflow region.

  In (E), the 1st distribution part connection member 32aD which has outflow area 32aDa, outflow area 32aDb, and outflow area 32aDc is shown. The outflow region 32aDa, the outflow region 32aDb, and the outflow region 32aDc are configured by changing the number of circular outflow ports having the same flow path cross-sectional area. The outflow region 32aDa is composed of one circular outlet, the outflow region 32aDb is composed of two circular outlets, and the outflow region 32aDc is composed of three circular outlets. Accordingly, the outflow region 32aDa is formed as the first outflow region, and the outflow region 32aDc is formed as the second outflow region. The outflow region 32aDb is formed as the second outflow region in relation to the outflow region 32aDa, and the outflow region 32aDb is formed as the first outflow region in relation to the outflow region 32aDc.

  In (F), the 1st distribution part connection member 32aE which has outflow area 32aEa, outflow area 32aEb, and outflow area 32aEc is shown. The outflow region 32aEa corresponds to the outflow region 32aDa, the outflow region 32aEb corresponds to the outflow region 32aDb, and the outflow region 32aEc corresponds to the outflow region 32aDc. The outflow region 32aEa has the same shape as the outflow region 32aDa. The outflow region 32aEb and the outflow region 32aEc have an oval shape connecting the outer peripheries of the outflow region 32aDb and the outflow region 32aDc.

  In (G), the 1st distribution part connection member 32aF which has the outflow area | region 32aFa, the outflow area | region 32aFb, and the outflow area | region 32aFc is shown. The outflow region 32aFa corresponds to the outflow region 32aEa, the outflow region 32aFb corresponds to the outflow region 32aEb, and the outflow region 32aFc corresponds to the outflow region 32aEc. The outflow region 32aFa has the same shape as the outflow region 32aEa. The outflow region 32aFb and the outflow region 32aFc have a shape in which a partition is provided in the outflow region 32aEb and the outflow region 32aEc.

  In the present embodiment described above, the windward side heat exchange core part 11 is divided into two parts to form the windward side core parts 11a and 11b, and the leeward side heat exchange core part 21 is divided into two parts to obtain the leeward side core part 21a, Although 21b is used, the division mode of the core is not limited to this. The windward side heat exchange core part 11 and the leeward side heat exchange core part 21 may be divided into three or more. Moreover, you may divide into the mutually different number instead of dividing | segmenting the windward side heat exchange core part 11 and the leeward side heat exchange core part 21 into the same number. For example, the leeward side heat exchange core part 11 may be divided into two and the leeward side heat exchange core part 21 may be divided into three.

1: Refrigerant evaporator 10: Upwind evaporator (second evaporator)
11: Windward side heat exchange core part (heat exchange core part)
111: Tube 11a: Windward core (third core)
11b: Windward core (fourth core)
12: Upwind tank (tank)
13: Upwind tank (tank)
13a: first refrigerant distributor 13b: second refrigerant distributor 20: leeward evaporator (first evaporator)
21: Downward heat exchange core (heat exchange core)
211: Tube 21a: Downward core part (first core part)
21b: Downward core part (second core part)
22: Downward tank part (tank part)
23: Downward tank part (tank part)
23a: 1st refrigerant | coolant gathering part 23b: 2nd refrigerant | coolant gathering part 30: Refrigerant replacement | exchange part 31a: 1st gathering part connection member (1st inflow channel (1st communication part))
31b: 2nd gathering part connection member (2nd inflow channel (2nd communication part))
32a: 1st distribution part connection member (2nd outflow channel (2nd communication part))
32b: 2nd distribution part connection member (1st outflow channel (1st communication part))
33: Intermediate tank section 33a: first refrigerant passage (first relay passage)
33b: second refrigerant passage (second relay flow path)

Claims (3)

A refrigerant evaporator (1) for exchanging heat between a fluid to be cooled 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;
The first evaporator and the second evaporator are respectively
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 and collecting or distributing refrigerant flowing through the plurality of tubes;
The heat exchange core part (21) in the first evaporation part is at least one of a first core part (21a) constituted by a part of the tube groups of the plurality of tubes (211) and a remaining tube group. It has a second core part (21b) composed of a part of a tube group,
The heat exchange core part (11) in the second evaporation part is composed of a tube group facing at least a part of the first core part composed of a part of the plurality of tubes (211). The third core portion (11a), and the fourth core portion (11b) composed of at least a part of the remaining tube groups.
Of the pair of tank parts (22, 23) in the first evaporation part, one tank part (23) is a first refrigerant assembly part (23a) for collecting refrigerant from the first core part, the first A second refrigerant assembly part (23b) for collecting refrigerant from the two core parts (21b),
Of the pair of tank parts (12, 13) in the second evaporation part, one tank part (13) is a first refrigerant distribution part (13a) for distributing refrigerant to the third core part, and the fourth A second refrigerant distributor (13b) that distributes the refrigerant to the core (11b);
The first evaporating unit and the second evaporating unit include a first communication unit (31a, 32b, 33a) for guiding the refrigerant of the first refrigerant collecting unit to the second refrigerant distributing unit, and the second refrigerant collecting unit. It is connected via a refrigerant replacement part (30) having a second communication part (31b, 32a, 33b) for guiding the refrigerant to the first refrigerant distribution part,
The refrigerant replacement part has an intermediate tank part (33),
The intermediate tank portion is
The first refrigerant flow path is connected to the first refrigerant collecting section through a first refrigerant flow-in path (31a), and the second refrigerant distribution section is connected to the first refrigerant flow-out path (32b). (33a)
A second relay flow path connected to the second refrigerant collecting section via a second refrigerant flow-in flow path (31b) and a first refrigerant distribution section connected to the second refrigerant distribution section via a second refrigerant flow-out flow path (32a). (33b)
In the first relay flow path and the second relay flow path, the refrigerant flows out from the one end side toward the other end side and flows out to the first outflow path and the second outflow path. ,
In each of the first outflow channel and the second outflow channel, a first outflow region where the refrigerant does not easily flow out is formed on the one end side, and the refrigerant is disposed on the other end side of the first outflow region. The refrigerant | coolant evaporator characterized by the 2nd outflow area | region easy to flow out being formed.   2. The refrigerant evaporator according to claim 1, wherein a flow path cross-sectional area of the second outflow area is larger than a flow path cross-sectional area of the first outflow area. At least one of the first outflow region and the second outflow region is constituted by one or a plurality of openings,
2. The refrigerant evaporator according to claim 1, wherein the number of the openings included in the second outflow region is larger than the number of the openings included in the first outflow region.

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