JP2014013104A - Refrigerant evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the reduction of the amount of the refrigeration oil flowing into a compressor during the operation of a refrigeration cycle in a structure where refrigerants flowing in heat exchange core parts of first and second evaporation parts are interchanged in a width direction of the heat exchange core parts.SOLUTION: A refrigerant evaporator 1 is composed of a laminated body of a first tube unit 41, which is formed by joining a pair of core plates, and a laminated body of a second tube unit 51, which is formed by joining a pair of core plates. The first tube unit 41 includes: a first linear tube 42 and a third linear tube 43; a first tank formation part 46 which communicates with the first tube 42 and forms a first tank part; and a second tank formation part 47 which communicates with the third tube 43 and forms a second tank part. The second tube unit 51 includes: a second linear tube 52 and a fourth linear tube 53; a fourth tank formation part 57 which communicates with the second tube 52 and forms the second tank part; and a third tank formation part 56 which communicates with the fourth tube 53 and forms the first tank part.

Description

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

  The refrigerant evaporator constitutes a refrigeration cycle together with a compressor and the like. The refrigerant evaporator cools the cooled fluid by absorbing heat from the cooled fluid and evaporating the refrigerant by exchanging heat between the cooled fluid (for example, air) flowing outside and the refrigerant flowing inside. Functions as a cooling heat exchanger.

  As this type of refrigerant evaporator, the first and second evaporators having a heat exchange core part formed by laminating a plurality of tubes through which refrigerant flows and a pair of tank parts communicating with both end sides of the plurality of tubes Are arranged in series with respect to the flow direction of the fluid to be cooled (for example, see Patent Documents 1 and 2).

  As a refrigerant evaporator having such a configuration, a refrigerant evaporator having a front-rear U-turn type refrigerant flow in the heat exchange core parts of the first and second evaporators arranged in the front-rear direction with the flow direction of the fluid to be cooled in the front-rear direction. Yes (see, for example, Patent Document 1).

  In this front-rear U-turn type refrigerant evaporator, one tank part of the pair of tank parts in the first and second evaporator parts is located on one end side of the plurality of tubes, and the pair in the first and second evaporator parts. The other tank part is located on the other end side of the plurality of tubes. Then, after the refrigerant flowing into one tank part of the first evaporation part passes through the heat exchange core part of the first evaporation part, it flows out of the other tank part of the first evaporation part, It flows into the other tank part. Thereafter, the refrigerant that has flowed into the other tank of the second evaporator passes through the heat exchange core of the second evaporator in the direction opposite to the refrigerant that passes through the heat exchange core of the first evaporator. After that, it flows out from one tank part of the second evaporation part.

  Further, as an improvement of the front / rear U-turn type refrigerant evaporator, when the refrigerant flowing out from the heat exchange core part of the first evaporation part flows into the heat exchange core part of the second evaporation part, the first and second There is a refrigerant evaporator having a configuration in which the refrigerant flowing through the heat exchange core portion of the evaporation portion is replaced in the width direction (left-right direction) of the heat exchange core portion (see, for example, Patent Document 1). Below, the refrigerant evaporator of this structure is called the refrigerant evaporator of a conventional structure. In this refrigerant evaporator, 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, and the heat exchange core of the first evaporation part The refrigerant flowing on the other side in the width direction of the part is configured to flow to one side in the width direction of the heat exchange core part of the second evaporator.

  In the refrigerant evaporator of the conventional configuration, in order to realize such a refrigerant flow, the other tank parts of the first and second evaporation parts are separated from the tank part for collecting and distributing the refrigerant. It was connected by the refrigerant | coolant replacement | exchange parts, such as a tank part and an external communication part (refer patent document 1). That is, in the refrigerant evaporator having the conventional configuration, the purpose is to replace the refrigerant flow only when the refrigerant flowing out from the heat exchange core part of the first evaporation part flows into the heat exchange core part of the second evaporation part. The refrigerant replacement part was provided.

Japanese Patent No. 4124136 Japanese Patent No. 4024095

  By the way, the refrigerant evaporated inside the refrigerant evaporator circulates in the refrigeration cycle together with refrigeration oil for lubrication inside the compressor.

  The refrigerant evaporator having the above-described conventional configuration increases the internal volume of the refrigerant evaporator compared to the above-described front and rear U-turn type refrigerant evaporator due to the presence of the refrigerant replacement unit such as the intermediate tank unit and the external communication unit. . For this reason, in the refrigerant evaporator having the above-described conventional configuration, the amount of refrigerating machine oil present in the evaporator increases, leading to a reduction in the amount of refrigerating machine oil flowing into the compressor during operation of the refrigerating cycle.

  In Patent Document 2, the refrigerant flowing through the heat exchange core portions of the first and second evaporators is not configured to be replaced in the width direction of the heat exchange core portion, but a pair of core plates are joined to form a tube and a tank portion. A laminated refrigerant evaporator in which a tube and a tank part are integrally formed by laminating a plurality of tube units constituting a part of the above is described. This refrigerant evaporator is also provided with an intermediate tank part different from the tank part for distributing or collecting the refrigerant flowing through the tubes. For this reason, even when it is going to implement | achieve the structure which replaces the refrigerant | coolant which flows through the heat exchange core part of a 1st, 2nd evaporation part in the width direction of a heat exchange core part with a laminated | stacked refrigerant evaporator, a refrigerant | coolant is collected or distributed. A configuration in which an intermediate tank portion different from the tank portion to be provided is only conceivable. For this reason, also in this case, the above-mentioned problem occurs.

  In view of the above points, the present invention provides a heat exchange core section of the first and second evaporation sections when the refrigerant flowing out of the heat exchange core section of the first evaporation section flows into the heat exchange core section of the second evaporation section. An object of the present invention is to provide a refrigerant evaporator that can suppress a reduction in the amount of refrigeration oil flowing into a compressor during operation of a refrigeration cycle in a refrigerant evaporator having a configuration in which the refrigerant flowing through the refrigerant is replaced in the width direction of the heat exchange core portion. .

In order to achieve the above object, in the invention described in claim 1,
The heat exchange core part (21) of the first evaporation part is a first core part (21a) constituted by a first tube (42) group and a second tube (52) group among a plurality of tubes (211). Having a second core portion (21b) configured;
The heat exchange core part (11) of the second evaporation part (10) faces the first core part (21a) in the flow direction of the fluid to be cooled among the plurality of tubes (111), and the third tube (43). A third core portion (11a) constituted by a group and a fourth core portion (11b) constituted by a fourth tube (53) group facing the second core portion (21b) in the flow direction of the fluid to be cooled. Have
The first core portion and the third core portion are configured by stacking a plurality of first tube units (41) formed by joining a pair of core plates (41a, 41b).
The first tube unit communicates with one end side of the first tube, communicates with the tank forming portion (44) forming the first tank portion (32) on one end side, and the other end side of the first tube, and with the other end The first tank forming part (46) forming the first tank part (33) on the side, the third tube (43), and the one end side of the third tube, and the second tank part (31) on the one end side A tank forming part (45) that forms a second tank forming part (47) that communicates with the other end side of the third tube and forms a second tank part (34) on the other end side,
The second core portion and the fourth core portion are configured by stacking a plurality of second tube units (51) formed by joining a pair of core plates (51a, 51b),
The second tube unit communicates with the fourth tube (53), one end side of the fourth tube, forms a second tank portion (31) on one end side, and other than the fourth tube. Communicating with one end side of the third tank forming portion (56) forming the first tank portion (33) on the other end side, the second tube (52), and the second tube. A tank forming part (54) for forming the first tank part (32) and a fourth tank forming part (54) for communicating with the other end side of the second tube and forming a second tank part (34) on the other end side. 57).

  According to this, in the first tube unit, the first tank part on the other end side communicates with the first core part, and in the second tube unit, the first tank part on the other end side communicates with the fourth core part. Therefore, when the refrigerant flows into the first core part from the first tank part on one end side, the refrigerant flowing out from the first core part passes through the first tank part on the other end side to the fourth core part. Inflow. In the first tube unit, the second tank part on the other end side communicates with the second core part, and in the second tube unit, the second tank part on the other end side communicates with the third core part. When the refrigerant flows from the first tank portion on the one end side into the second core portion, the refrigerant flowing out from the second core portion flows into the third core portion via the second tank portion on the other end side.

  Thus, according to the present invention, in the stacked refrigerant evaporator, the refrigerant flow is replaced in the width direction of the heat exchange core portion that is the stacking direction of the tubes without separately providing the refrigerant replacement portion. Compared with the case where a refrigerant replacement unit is separately provided as in the conventional refrigerant evaporator, the internal volume of the entire refrigerant evaporator can be reduced. As a result, according to the present invention, it is possible to suppress a decrease in the amount of refrigerating machine oil that flows into the compressor during operation of the refrigerating cycle.

In the invention according to claim 4,
The first and second evaporators have a pair of vertically long plate-like members joined together in the middle, and tube units (41, 51) having the refrigerant flow paths of the first and second evaporators inside, It is composed of multiple layers,
One tube unit is
A first through-hole portion (44, 54) and a second through-hole portion (45, 55) on one end side which are located on one end side in the longitudinal direction of the tube unit and penetrate in the stacking direction;
A first through-hole portion (46, 56) and a second through-hole portion (47, 57) on the other end side, which are located on the other end side in the longitudinal direction of the tube unit and penetrate in the stacking direction;
A first refrigerant channel (42, 52) having a shape communicating with the first through-hole portion on one end side and extending toward the other end in the longitudinal direction of the tube unit;
A second refrigerant flow path that is arranged in the lateral direction of the tube unit with respect to the first refrigerant flow path, communicates with the second through-hole portion on one end side, and extends toward the other longitudinal end side of the tube unit. (43, 53)
In a state where a plurality of tube units are stacked, the first through-hole portions on one end side communicate with each other, the second through-hole portions on one end side communicate with each other, and the first through-hole portions on the other end side communicate with each other. The second through-hole portions on the other end side communicate with each other to form four refrigerant channels (31, 32, 33, 34) extending in the stacking direction of the tube units,
The tube unit (41) located on one side in the stacking direction among the plurality of tube units communicates with the first through hole portion (46) on the other end side and the first refrigerant flow path (42), and others. The second through-hole portion (47) on the end side communicates with the second refrigerant channel (43),
The tube unit (51) located on the other side in the stacking direction among the plurality of tube units communicates with the first through hole portion (56) on the other end side and the second refrigerant channel (53), The second through-hole portion (57) on the end side and the first refrigerant channel (52) communicate with each other.

  According to this, in the stacked refrigerant evaporator, it is possible to realize a configuration in which the refrigerant flow is switched in the width direction of the heat exchange core portion, which is the stacking direction of the tube units, without separately providing a refrigerant replacement portion. For this reason, according to the present invention, the internal volume of the entire refrigerant evaporator can be reduced as compared with the case where a refrigerant replacement unit is separately provided as in the refrigerant evaporator of the conventional configuration, and the compressor is operated during the operation of the refrigeration cycle. A reduction in the amount of refrigerating machine oil flowing into can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a schematic diagram which shows the concept of the refrigerant | coolant flow of the refrigerant evaporator which concerns on 1st Embodiment. It is a front view of the refrigerant evaporator concerning a 1st embodiment. It is a disassembled perspective view of the refrigerant evaporator shown in FIG. It is a front view of the 1st tube unit in FIG. It is a front view of the 2nd tube unit in FIG. It is a front view of the 1st tube unit which comprises the refrigerant evaporator of the comparative example 1. It is a front view of the 2nd tube unit which constitutes the refrigerant evaporator of comparative example 1. It is a measurement result of the amount of residual freezer oil of the refrigerant evaporator concerning a 1st embodiment, and the refrigerant evaporator of the conventional composition. It is a schematic diagram which shows the concept of the refrigerant | coolant flow of the refrigerant evaporator which concerns on 2nd Embodiment. It is a disassembled perspective view of the refrigerant evaporator which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 to 4A and 4B. The refrigerant evaporator 1 according to the present embodiment is applied to a vapor compression refrigeration cycle of a vehicle air conditioner that adjusts the temperature in the vehicle interior, and absorbs heat from the blown air blown into the vehicle interior to evaporate the refrigerant. It is a heat exchanger for cooling which cools blowing air. In the present embodiment, the blown air corresponds to the “cooled fluid flowing outside” in the claims.

  As is well known, the refrigeration cycle includes a compressor, a radiator (condenser), an expansion valve, and the like (not shown) in addition to the refrigerant evaporator 1. In this embodiment, the refrigeration cycle is received between the radiator and the expansion valve. It is comprised as a receiver cycle which arrange | positions a liquid container.

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

  The windward side evaporator 10 and the leeward side evaporator 20 have heat exchange core parts 11 and 21, respectively. 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. Further, the left half of the leeward heat exchange core portion 21 as viewed from the flow direction of the blown air (air flow upstream side) is referred to as the leeward core left side portion 21a, and the right half is referred to as the leeward core right side portion 21b. The leeward core left side portion 21a and the leeward core right side portion 21b respectively constitute “first core portion and second core portion” in the claims. Similarly, when viewed from the flow direction of the blown air, the left half of the windward heat exchange core portion 11 is referred to as the windward core left side portion 11a, and the right half is referred to as the windward core right side portion 11b. The windward core left side portion 11a and the windward core right side portion 11b constitute the “third core portion and fourth core portion” in the claims, respectively.

  As shown in FIG. 2, the windward and leeward heat exchange cores 11 and 21 have a plurality of tubes 42, 43, 52, and 53 through which refrigerant flows and fins 112 and 212 for promoting heat exchange. Configured. FIG. 2 is a view of the refrigerant evaporator 1 as viewed from the downstream side in the flow direction of the blown air. In FIG. 2, each component of the windward side evaporator 10 that is arranged to face the leeward side evaporator 20 is indicated by reference numerals with parentheses. Moreover, the up-down direction of FIG. 2 corresponds with the up-down direction of the refrigerant evaporator 1 in the state mounted in the vehicle.

  In the present embodiment, among the plurality of tubes on the leeward side, the leeward core left side 21a is configured by the first tube 42 group on the left half (right half in FIG. 2) when viewed from the flow direction of the blown air. The leeward core right side portion 21b is configured by the second tube 52 group of the right half (left half in FIG. 2) when viewed from the air flow direction.

  Similarly, among the plurality of tubes on the windward side, the windward core left side portion 11a is configured by the third tube 43 group on the left half (the right half portion in FIG. 2) when viewed from the flow direction of the blown air. The leeward core right side portion 11b is configured by the fourth tube 53 group of the right half (left half in FIG. 2) when viewed from the flow direction.

  As shown in FIG. 2, the refrigerant evaporator 1 has a pair of tank portions communicating with both end sides of the tubes 42, 43, 52, 53. The pair of tank portions are two upper tank portions 31 and 32 communicating with one end side (upper end side) in the longitudinal direction of the tubes 42, 43, 52 and 53, and the other end side in the longitudinal direction of the tubes 42, 43, 52 and 53. It has two lower tank parts 33 and 34 communicating with (lower end side).

  The two upper tank portions 31 and 32 are arranged side by side in the flow direction of the blown air. In the present embodiment, the windward upper tank portion 31 is referred to as a windward upper tank portion 31, and the leeward upper tank portion is referred to as a leeward upper tank portion 32. A refrigerant inlet and a refrigerant outlet are provided at one longitudinal end of the two upper tank portions 31 and 32. In the present embodiment, a refrigerant inlet 32 a is provided in the leeward upper tank portion 32, and a refrigerant outlet port 31 a is provided in the leeward upper tank portion 31.

  On the other hand, the two lower tank parts 33 and 34 are arranged side by side in the longitudinal direction of the tubes 42, 43, 52, 53, that is, in the vertical direction, not in the flow direction of the blown air. In the present embodiment, the first lower tank portion 33 is located below and the second lower tank portion 34 is located above.

  The leeward upper tank portion 32 and the leeward upper tank portion 31 correspond to first and second tank portions on one end side that communicate with one end side of the tube described in the claims, and the first lower tank. The part 33 and the second lower tank part 34 correspond to the first and second tank parts on the other end side communicating with the other end side of the tube described in the claims.

  The refrigerant evaporator 1 shown in FIG. 2 is a drone cup type, and is configured as a stacked heat exchanger in which a plurality of tube units 41 and 51 are stacked as shown in FIG. In FIG. 3, the fins 112 and 212 shown in FIG. 2 are omitted.

  The refrigerant evaporator 1 includes a first tube unit group 40 in which a first tube unit 41 is stacked, and a second tube unit group 50 in which a second tube unit 51 is stacked.

  The first and second tube units 41, 51 are both core plates 41a, 41b, 51a which are a pair of vertically long plate-like members formed by subjecting a substantially rectangular metal plate material to metal processing such as pressing. , 51b are joined together in the middle to form one tube unit. Two linear tubes 42, 43, 52, 53 are formed in parallel inside one tube unit 41, 51.

  Moreover, as shown to FIG. 4A and 4B, the tank formation parts 44-47 and 54-57 are each formed in the both ends side of the longitudinal direction of one tube unit 41 and 51, respectively. The tank forming portions 44 to 47 and 54 to 57 are through-hole portions constituting a part of the tank portion, and form a cylindrical tank portion when the tube units 41 and 51 are stacked.

  Specifically, the first tube unit group 40 constitutes the leeward core left side portion 21a and the leeward core left side portion 11a in FIG.

  As shown in FIGS. 3 and 4A, one first tube unit 41 includes one first tube 42 of the leeward core left side 21a (first core part) and one of the leeward core left side 11a (third core part). ) One third tube 43. The first and third tubes 42 and 43 extend linearly in the longitudinal direction of the first tube unit 41. The range indicated by L1 in FIG. 4A is the first and third tubes 42 and 43.

  The first tube unit 41 communicates with the upper end side of the first tube 42, and communicates with the leeward upper tank forming portion 44 that forms the leeward upper tank portion 32 in FIG. 2 and the upper end side of the third tube 43. 2 has an upwind upper tank forming portion 45 that forms the upwind upper tank portion 31 in FIG.

  The first tube unit 41 includes a first tank forming portion 46 that forms the first lower tank portion 33 in FIG. 2, and a second tank forming portion 47 that forms the second lower tank portion 34 in FIG. have. In the first tube unit 41, the first tank forming part 46 communicates with the lower end side of the first tube 42 via the communication part 48, and the second tank forming part 47 communicates with the communication part 49. The third tube 43 communicates with the lower end side.

  On the other hand, the 2nd tube unit group 50 comprises the leeward side core right side part 21b and the leeward side core right side part 11b in FIG.

  As shown in FIGS. 3 and 4B, the second tube unit 51 includes a second tube 52 of the leeward core right side portion 21b (second core portion) and a fourth of the leeward core right side portion 11b (fourth core portion). Tube 53. The second and fourth tubes 52 and 53 extend linearly in the longitudinal direction of the second tube unit 51. The range indicated by L1 in FIG. 4B is the second and fourth tubes 52 and 53.

  The second tube unit 51 communicates with the upper end side of the second tube 52, and is connected to the leeward upper tank forming portion 54 that forms the leeward upper tank portion 32 in FIG. 2 and the upper end side of the fourth tube 53. It has a windward upper tank forming part 55 which forms the windward upper tank part 31 in FIG.

  The second tube unit 51 includes a third tank forming portion 56 that forms the first lower tank portion 33 in FIG. 2, and a fourth tank forming portion 57 that forms the second lower tank portion 34 in FIG. have. In the second tube unit 51, the third tank forming portion 56 communicates with the lower end side of the fourth tube 53 via the communication portion 58, and the fourth tank forming portion 57 is communicated with the communication portion 59. The second tube 52 communicates with the lower end side.

  When the first and second tube units 41 and 51 are stacked, the first and second tank forming portions 46 and 56 of the first and second tube units 41 and 51 are overlapped with each other when viewed from the stacking direction. Has been placed. Similarly, the second and fourth tank forming portions 47 and 57 of the first and second tube units 41 and 51 overlap when viewed from the stacking direction when the first and second tube units 41 and 51 are stacked. It is arranged at the position to do.

  Thus, when the first and second tube units 41 and 51 are stacked, the first lower tank portion 33 is formed by the first and third tank forming portions 46 and 56, and the second and fourth tank forming portions are formed. The second lower tank portion 34 is formed by 47 and 57.

  In addition, the first and second tank forming portions 46 and 47 of the first tube unit 41 are arranged at the center in the width direction (left and right direction in the drawing) of the first tube unit orthogonal to the longitudinal direction of the first tube unit 41. It arrange | positions along with the longitudinal direction (up-down direction of a figure) of the 1st tube unit 41. As shown in FIG. Similarly, the third and fourth tank forming portions 56, 57 of the second tube unit 51 are located at the center in the width direction (left-right direction in the drawing) of the second tube unit orthogonal to the longitudinal direction of the second tube unit 51. The second tube unit 51 is arranged side by side in the longitudinal direction (vertical direction in the figure).

  For this reason, the 1st, 2nd tube units 41 and 51 of this embodiment are comprised by the tube unit of the same internal structure, and have the relationship from which the front and back directions of the tube unit in a lamination direction differ. Therefore, according to the present embodiment, the refrigerant evaporator 1 can be configured by one type of tube unit, that is, the types of components constituting the refrigerant evaporator 1 can be reduced, and thus the manufacturing cost can be reduced. .

  In the first and second tube units 41 and 51 described above, the first tube 42 and the second tube 52 are the first refrigerant flow path constituting the leeward evaporation unit 20, and the third tube 43 and the fourth tube Reference numeral 53 denotes a second refrigerant flow path that constitutes the windward evaporator 10. The tank forming portions 44 to 47 and 54 to 57 are through-hole portions penetrating in the stacking direction of the first and second tube units 41 and 51, respectively. Therefore, it can be said that the refrigerant evaporator 1 according to the present embodiment is configured as follows.

  The leeward evaporator 20 and the windward evaporator 10 have a pair of vertically long plate-like members 41 a, 41 b, 51 a, 51 b joined together in the middle, and refrigerant in the leeward evaporator 20 and the windward evaporator 10. A plurality of tube units 41, 51 having flow paths 42, 43, 52, 53 therein are stacked.

  The one tube unit 41, 51 includes a first through-hole portion 44, 54 and a second through-hole portion 45, 55 on one end in the vertical direction, on the upper end side in FIGS. 4A and 4B, and a tube unit. The first through-hole portions 46 and 56 and the second through-hole portions 47 and 57 on the lower end side located on the lower end side in FIGS. 4A and 4B are provided.

  In a state where the plurality of tube units 41 and 51 are stacked, the first through hole portions 44 and 54 on the upper end side communicate with each other, the second through hole portions 45 and 55 on the upper end side communicate with each other, and the first through hole portions 45 and 55 on the lower end side communicate with each other. When the first through-hole portions 46 and 56 communicate with each other and the second through-hole portions 47 and 57 on the lower end side communicate with each other, four cylindrical tank portions 31, 32, 33, and 34 are formed. The four tank portions 31, 32, 33, and 34 are four refrigerant channels that extend in the stacking direction of the tube units 41 and 51.

  Furthermore, one tube unit 41, 51 communicates with the first through-hole portions 44, 54 on the upper end side, and extends to the lower end side of the tube units 41, 51, with the first refrigerant flow paths 42, 52 having a shape extending toward the lower end side. The first refrigerant passages 42 and 52 are arranged side by side in the lateral direction of the tube units 41 and 51, communicate with the second through hole portions 45 and 55 on the upper end side, and extend toward the lower end side. 2 refrigerant flow paths 43 and 53.

  And the communication state of the 1st, 2nd refrigerant | coolant flow path and the 1st, 2nd through-hole part of a lower end side differs in one side and the other side in the lamination direction among several tube units 41 and 51. . The tube unit 41 located on one side in the stacking direction among the plurality of tube units 41 and 51 has the first through hole portion 46 on the lower end side and the first refrigerant channel 42 communicating with each other, and the lower end side. The 2nd through-hole part 47 and the 2nd refrigerant | coolant flow path 43 are connecting. On the other hand, among the plurality of tube units, the tube unit 51 located on the other side in the stacking direction communicates with the first through-hole portion 56 on the lower end side and the second refrigerant channel 53, and on the lower end side. The 2 through-hole portion 57 and the first coolant channel 52 communicate with each other.

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

  The low-pressure refrigerant decompressed by an expansion valve (not shown) is introduced from a refrigerant introduction port 32a formed on one end side of the leeward upper tank portion 32 shown in FIG. The refrigerant introduced into the leeward side upper tank unit 32 includes a first tube 42 group constituting the leeward core left side portion 21a of the leeward side evaporation unit 20 and a second tube 52 group constituting the leeward core right side portion 21b. It is distributed to and descends.

  At this time, as shown in FIG. 3, in the first tube unit group 40, the first tank forming portion 46 constituting the first lower tank portion 33 in FIG. In the group 50, the third tank forming part 56 constituting the first lower tank part 33 in FIG. 2 communicates with the fourth tube 53.

  Therefore, as shown in FIGS. 1 and 3, the refrigerant descending the first tube 42 (the leeward core left side 21a) as indicated by the arrow A1 becomes the first tank forming portion 46 (the second tank in FIG. 2) as indicated by the arrow A2. 1 part of the lower tank part 33), gathers, and flows into the third tank forming part 56 (the remaining part of the first lower tank part 33 in FIG. 2). And the refrigerant | coolant which flowed into the 3rd tank formation part 56 is distributed and raised to the 4th tube 53 (windward core right side part 11b) like arrow A3.

  Further, as shown in FIG. 3, in the second tube unit group 50, the fourth tank forming portion 57 constituting the second lower tank portion 34 in FIG. 2 communicates with the second tube 52, and the first tube unit group. In 40, the second tank forming part 47 constituting the second lower tank part 34 in FIG. 2 communicates with the third tube 43.

  Therefore, as shown in FIGS. 1 and 3, the refrigerant descending the second tube 52 (leeward core right side portion 21 b) as indicated by arrow B 1 is the fourth tank forming portion 57 (second state in FIG. 2) as indicated by arrow B 2. Flows into and collects in the second tank forming portion 47 (the remaining portion of the second lower tank portion 34 in FIG. 2). Then, the refrigerant that has flowed into the second tank forming portion 47 flows into the third tube 43 (windward core left side portion 11a) and rises as indicated by an arrow B3.

  And the refrigerant | coolant which raised each core part 11a, 11b of the windward heat exchange core part 11 flows in into the inside of the windward upper tank part 31 (tank formation part 45, 55), respectively, and windward upper tank part 31 Is led out to a compressor (not shown) suction side from a refrigerant outlet 31a formed on one end side.

  By the way, as described in the column of the problem to be solved by the invention, the refrigerant evaporator having the above-described conventional configuration in which the tube and the tank unit are configured as separate parts includes a refrigerant replacement unit such as an intermediate tank unit or an external communication unit. Since it was provided separately, the internal volume of the refrigerant evaporator increased due to the presence of the refrigerant replacement section.

  Moreover, when it is going to implement | achieve the refrigerant | coolant evaporator of the structure which replaces the refrigerant | coolant which flows through the heat exchange core part of a 1st, 2nd evaporation part in the width direction of a heat exchange core part with a laminated heat exchanger, patent document 1, Based on the refrigerant evaporator described in FIG. 2, the refrigerant evaporator of Comparative Example 1 shown in FIGS. 5A and 5B can be considered. The refrigerant evaporator of Comparative Example 1 is obtained by changing the refrigerant evaporator of this embodiment as follows.

  The first tube unit 41 includes, in addition to the first and second lower tank forming portions 46 and 47, a first intermediate tank forming portion 61 and a second intermediate tank forming portion 62 for forming two intermediate tank portions. Is formed. The first lower tank forming portion 46 and the second intermediate tank forming portion 62 communicate with each other via the communication portion 64. The second lower tank forming part 47 and the first intermediate tank forming part 61 communicate with each other via the communication part 63.

  Similarly, in the second tube unit 51, in addition to the first and second lower tank forming portions 56 and 57, a first intermediate tank forming portion 61 and a second intermediate tank forming for forming two intermediate tank portions are formed. A portion 62 is formed. The first lower tank formation part 56 and the first intermediate tank formation 61 communicate with each other via the communication part 65. The second lower tank forming part 57 and the second intermediate tank forming part 62 communicate with each other via the communication part 66.

  In the refrigerant evaporator of Comparative Example 1, the same refrigerant flow as that of the refrigerant evaporator of the present embodiment is realized through the two intermediate tank portions formed by the first and second intermediate tank forming portions 61 and 62. The

  However, also in the refrigerant evaporator of Comparative Example 1, the internal volume of the refrigerant evaporator increases due to the presence of the two intermediate tank portions.

  On the other hand, according to the refrigerant evaporator 1 of the present embodiment, as described above, in the stacked refrigerant evaporator, the width direction of the heat exchange core part is not provided without separately providing a refrigerant replacement part such as an intermediate tank part. Therefore, the internal volume of the entire refrigerant evaporator can be reduced as compared with the case where the refrigerant replacement unit is separately provided.

  The first tube unit 41 of the present embodiment is provided with communication portions 48 and 49 that allow one of the first and third tubes 42 and 43 to communicate with one of the first and second tank forming portions 46 and 47. However, the communication portions 48 and 49 are formed inside one tube unit, and the communication portions 48 and 49 are not in direct communication with each other between the adjacent first tube units 41. For this reason, the internal volume of the communication parts 48 and 49 is smaller than the case where the communication parts 48 and 49 communicate between adjacent tube units, and an internal volume is larger than the intermediate tank part in the refrigerant evaporator of the comparative example 1. small. The same applies to the communication portions 58 and 59 of the second tube unit 51.

  As a result, according to the refrigerant evaporator 1 of the present embodiment, the amount of refrigerating machine oil remaining in the refrigerant evaporator 1 can be reduced as shown in FIG. A decrease in the amount of refrigerating machine oil flowing into the compressor during the operation of the cycle can be suppressed. In addition, the refrigerant evaporator of the conventional structure in FIG. 6 is provided with the intermediate | middle tank part shown by FIG.

(Second Embodiment)
As shown in FIG. 7, in the refrigerant evaporator 1 of this embodiment, the windward side heat exchange core part 11 and the leeward side heat exchange core part 21 have four core parts 11a-11d and 21a-21d, respectively. ing. In the windward side heat exchange core part 11 and the leeward side heat exchange core part 21, the first core parts 11 a and 21 a from the left as viewed from the flow direction of the blown air are opposed to each other, and the second core parts 11 b and 21 b are Are opposed to each other, the third core portions 11c and 21c are opposed to each other, and the fourth core portions 11d and 21d are opposed to each other.

  The first core portion 21a and the second core portion 21b from the left of the leeward side heat exchange core portion 21 as viewed from the flow direction of the blown air are respectively “first core portion and second core” in the claims. Part ". At this time, the first core portion 11a and the second core portion 11b from the left of the windward side heat exchange core portion 11 as viewed from the flow direction of the blown air are respectively “third core portion, 4th core part "is comprised.

  In the present embodiment, the third core portion 21c and the fourth core portion 21d from the left of the leeward side heat exchange core portion 21 as viewed from the flow direction of the blown air are respectively the “first” in the claims. It can also be said that it constitutes “one core part, second core part”. At this time, the third core portion 11c and the fourth core portion 11d from the left of the upwind heat exchange core portion 11 when viewed from the flow direction of the blown air are respectively “third core portion, It can be said that it constitutes the “fourth core part”.

  As shown in FIG. 8, the refrigerant evaporator 1 of the present embodiment has a configuration in which two sets of adjacent first tube unit group 40 and second tube unit group 50 are arranged. A pair of adjacent first tube unit group 40 and second tube unit group 50 corresponds to first tube unit group 40 and second tube unit group 50 described in the first embodiment.

  However, in the tube units 41 and 51 at the boundary position between the tube unit groups 40 and 50 located second and third from the left side when viewed from the flow direction of the blown air, the first to fourth tank forming portions 46, 47, 56 and 57 are not through-holes, and holes are formed only on one side. Thereby, in both tube unit groups 40 and 50, the 1st tank formation part 46 and the 3rd tank formation part 56 do not communicate, but the 2nd tank formation part 47 and the 4th tank formation part 57 communicate. Not.

  Therefore, as shown in FIGS. 7 and 8, the refrigerant descending the first core portion 21a of the leeward heat exchange core portion 21 as indicated by the arrow A1 is the first tank forming portion 46 and the third tank as indicated by the arrow A2. The second core portion 11b of the windward heat exchange core portion 11 is raised through the forming portion 56 as indicated by an arrow A3.

  Further, the refrigerant descending the second core portion 21b of the leeward side heat exchange core portion 21 as indicated by the arrow B1 passes through the fourth tank forming portion 57 and the second tank forming portion 47 as indicated by the arrow B2, and then the arrow B3. As shown, the first core portion 11a of the upwind heat exchange core portion 11 is raised.

  Further, the refrigerant descending the third core portion 21c of the leeward side heat exchange core portion 21 as indicated by the arrow C1 passes through the first tank forming portion 46 and the third tank forming portion 56 as indicated by the arrow C2, and then the arrow C3. As shown, the fourth core portion 11d of the windward heat exchange core portion 11 is raised.

  Further, the refrigerant descending the fourth core portion 21d of the leeward side heat exchange core portion 21 as indicated by the arrow D1 passes through the fourth tank forming portion 57 and the second tank forming portion 47 as indicated by the arrow D2, and then the arrow D3. The 3rd core part 11c of the windward heat exchange core part 11 is raised like this.

  Thus, in the present embodiment, the first core portion 11a, 21a and the second core portion 11b, 21b from the left when viewed from the flow direction of the blown air among the windward and leeward heat exchange core portions 11, 21. The refrigerant flowing through the windward and leeward heat exchange cores 11 and 21 is replaced in the width direction of the heat exchange core. Similarly, in the windward and leeward heat exchange core parts 11 and 21, the third core part 11c and 21c and the fourth core parts 11d and 21d from the left as viewed from the flow direction of the blown air, The refrigerant flowing through the leeward heat exchange core portions 11 and 21 is replaced in the width direction of the heat exchange core portion.

  Since the refrigerant evaporator 1 of the present embodiment also has the same configuration as that of the first embodiment, the same effects as those of the first embodiment can be obtained.

  In the present embodiment, the refrigerant evaporator 1 is configured such that two sets of the first tube unit group 40 and the second tube unit group 50 that are adjacent to each other are arranged as a set. It is good also as a structure.

(Other embodiments)
(1) In the above-described embodiment, the positions of the first to fourth tank forming portions 46, 47, 56, 57 in the first and second tube units 41, 42 are the positions shown in FIGS. 4A, 4B. The positions of the first to fourth tank forming portions 46, 47, 56, and 57 are not limited to the positions shown in FIGS. 4A and 4B. The positions of the first and third tank forming portions 46 and 56 are not directly above the second and fourth tank forming portions 47 and 57, but with respect to the right and left directions directly above the second and fourth tank forming portions 47 and 57. It is good also as a position shifted. However, in such a case, since the first tube unit 41 and the second tube unit 51 have different shapes and two types of tube units must be formed, the first to fourth tank forming portions 46, 47, and 56 are formed. , 57 are preferably the positions shown in FIGS. 4A and 4B as in the first embodiment.

  (2) In the first embodiment, the left half of the plurality of tubes constitutes the core left side 11a, 21a, and the right half of the tube constitutes the core right side 11b, 21b. The number of tubes constituting each of 11a, 21a and core right side portions 11b, 21b can be arbitrarily changed. In this case, of the plurality of tubes, a part of the left tube constitutes the core left side portion, and the remaining tube constitutes the core right side portion.

  (3) In the above-described embodiment, the refrigerant introduction port 32a is provided in the leeward upper tank portion 32 and the refrigerant outlet port 31a is provided in the leeward upper tank portion 31, but the refrigerant introduction port and the refrigerant introduction port are switched. Also good.

  (4) In the above-described embodiment, the refrigerant inlet 32a and the refrigerant outlet 31a are provided in the upper tank portions 31 and 32. However, the refrigerant inlet and the refrigerant outlet may be provided in the lower tank portion. That is, the refrigerant evaporator 1 shown in FIG. 2 may be arranged upside down.

  (5) In the above-described embodiment, when the refrigerant flowing out from the heat exchange core part of the first evaporation part flows into the heat exchange core part of the second evaporation part, the heat exchange core parts of the first and second evaporation parts In the entire region, the configuration in which the refrigerant flowing through the heat exchange cores of the first and second evaporators is replaced in the width direction of the heat exchange cores has been described, but part of the heat exchange cores of the first and second evaporators In, the refrigerant flow may be formed in the width direction of the heat exchange core portion, and a refrigerant flow corresponding to a conventional front / rear U-turn type may be formed.

  Such a configuration is realized, for example, by adding a third tube unit group for forming a refrigerant flow corresponding to a conventional front and rear U-turn type to the refrigerant evaporator 1 described in the first embodiment. Is possible.

  (6) In the above-described embodiment, the example in which the refrigerant evaporator 1 is applied to the refrigeration cycle of the vehicle air conditioner has been described. However, the present invention is not limited thereto, and the present invention may be applied to, for example, a refrigeration cycle used in a water heater. good.

1 Refrigerant evaporator 10 Upwind evaporator (second evaporator)
11 Upwind heat exchange core (heat exchange core)
11a Windward core left side (third core)
11b Right side core right side part (4th core part)
20 leeward evaporation section (first evaporation section)
21 Downward heat exchange core (heat exchange core)
21a Downward core left side (first core)
21b Right side of leeward core (second core part)
31 Windward upper tank (first tank on one end)
32 leeward upper tank (second tank on one end)
33 1st lower tank part (1st tank part of the other end side)
34 Second lower tank part (second tank part on the other end side)
41 1st tube unit 42 1st tube (tube which comprises 1st core part, 1st refrigerant | coolant flow path)
43 3rd tube (Tube which comprises the 3rd core part, 2nd refrigerant | coolant flow path)
46 1st tank formation part (1st tank part of the other end side, 1st through-hole part of the other end side)
47 Second tank forming part (second tank part on the other end side, second through hole part on the other end side)
51 2nd tube unit 52 2nd tube (tube which comprises 2nd core part, 1st refrigerant | coolant flow path)
53 4th tube (tube which comprises 4th core part, 2nd refrigerant | coolant flow path)
56 3rd tank formation part (1st tank part of the other end side, 1st through-hole part of the other end side)
57 4th tank formation part (2nd tank part of the other end side, 2nd through-hole part of the other end side)

Claims (4)

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;
Each of the first evaporator and the second evaporator is
A heat exchange core portion (11, 21) configured by laminating a plurality of tubes (42, 43, 52, 53) through which a refrigerant flows;
First and second tank portions (32, 31) on one end side that communicate with one end side of the plurality of tubes and collect or distribute refrigerant flowing through the plurality of tubes;
The first and second tank portions (33, 34) on the other end side that communicate with the other end side of the plurality of tubes and collect or distribute the refrigerant flowing through the plurality of tubes,
The heat exchange core part (21) of the first evaporation part includes, among the plurality of tubes (211), a first core part (21a) constituted by a first tube (42) group and a second tube (52). ) Having a second core part (21b) composed of a group,
The heat exchange core part (11) of the second evaporation part (10) faces the first core part (21a) in the flow direction of the fluid to be cooled among the plurality of tubes (111). A third core portion (11a) composed of a group of three tubes (43) and a second core portion (21b) facing the second core portion (21b) in the flow direction of the fluid to be cooled and a fourth core (53) group It has 4 core parts (11b)
The first core part and the third core part have a configuration in which a plurality of first tube units (41) formed by joining a pair of core plates (41a, 41b) are laminated,
The first tube unit (41) communicates with the first tube (42) and one end side of the first tube, and forms a tank portion (44) forming the first tank portion (32) on the one end side. A first tank forming part (46) communicating with the other end side of the first tube and forming a first tank part (33) on the other end side, the third tube (43), and the first tube A tank forming part (45) that communicates with one end side of the three tubes and forms a second tank part (31) on the one end side, and communicates with the other end side of the third tube; A second tank forming part (47) forming a tank part (34),
The second core part and the fourth core part are configured by laminating a plurality of second tube units (51) formed by joining a pair of core plates (51a, 51b).
The second tube unit communicates with the fourth tube (53), one end side of the fourth tube, and a tank forming part (55) that forms the second tank part (31) on the one end side, A third tank forming part (56) that communicates with the other end side of the fourth tube and forms the first tank part (33) on the other end side, the second tube (52), and the second tube A tank forming portion (54) that communicates with one end side and forms the first tank portion (32) on the one end side, communicates with the other end side of the second tube, and a second tank portion (on the other end side) And 34) a fourth tank forming part (57).   2. The refrigerant evaporator according to claim 1, wherein the first and second tube units are configured by tube units having the same internal structure, and the front and back directions of the tube units in the stacking direction are different.   The said 1st, 2nd tank formation part is arrange | positioned along with the longitudinal direction of the said tube unit in the center part of the direction orthogonal to the longitudinal direction of the said tube unit. Refrigerant evaporator. 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 and second evaporating sections are tube units (41, 51) having a pair of vertically long plate-like members joined together in the middle and having the refrigerant flow paths of the first and second evaporating sections inside. Is composed of multiple layers,
One said tube unit is
A first through-hole portion (44, 54) and a second through-hole portion (45, 55) located on one end side in the longitudinal direction of the tube unit and penetrating in the stacking direction;
A first through hole portion (46, 56) and a second through hole portion (47, 57) on the other end side, which are located on the other end side in the longitudinal direction of the tube unit and penetrated in the stacking direction;
A first refrigerant channel (42, 52) having a shape communicating with the first through-hole portion on the one end side and extending toward the other end in the longitudinal direction of the tube unit;
The first refrigerant flow path is arranged in the lateral direction of the tube unit, communicates with the second through hole portion on the one end side, and extends toward the other longitudinal end side of the tube unit. Two refrigerant flow paths (43, 53),
In a state where the plurality of tube units are stacked, the first through hole portions on the one end side communicate with each other, the second through hole portions on the one end side communicate with each other, and the first through hole portion on the other end side By communicating with each other and the second through hole portions on the other end side communicating with each other, four refrigerant flow paths (31, 32, 33, 34) extending in the stacking direction of the tube units are formed,
In the tube unit (41) located on one side in the stacking direction among the plurality of tube units, the first through-hole portion (46) on the other end side and the first refrigerant channel (42) communicate with each other. In addition, the second through hole (47) on the other end side and the second refrigerant flow path (43) communicate with each other,
In the tube unit (51) located on the other side in the stacking direction among the plurality of tube units, the first through hole portion (56) on the other end side and the second refrigerant channel (53) communicate with each other. In addition, the second evaporator (57) on the other end side and the first refrigerant channel (52) communicate with each other.

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