JP2006029697A - Refrigerant evaporator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that independent controls on one side and the other side in the width direction of a core are difficult and many parts are required, a structure becomes complicated, and cost increases, although it is effective to form a cross passage in a tank member for turning a refrigerant at an upper end. <P>SOLUTION: This refrigerant evaporator is composed of a first core 30 and a second core 35 arranged in parallel, a refrigerant supply/exhaust member 25 having a refrigerant supply passage 26 and a refrigerant exhaust passage 28 arranged at lower ends of the first and second cores, a first tank member 42 arranged at upper ends of the first and second cores to communicate one side in the direction of the width of the first core with the other side in the direction of the width of the second core, and a second tank member 52 arranged at other ends in the direction of the length of the first and the second cores to communicate the other side in the direction of the width of the first core with one side in the direction of the width of the second core. The first tank member and the second tank member are arranged in an X shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerant evaporator that evaporates refrigerant in a refrigeration cycle such as an air conditioning system of a vehicle.

  In the refrigeration cycle, the refrigerant evaporator evaporates the mist refrigerant in the gas-liquid mixed phase, and takes cold heat (vaporization heat) from the wind flowing around it to generate cold wind. Generally, it consists of a flat rectangular parallelepiped core on the downstream side and upstream side in which many tubes are arranged side by side, a refrigerant inlet and outlet at the upper end or lower end of the core, and a refrigerant turn part at the lower end or upper end. It is arranged so as to cross the flow. The refrigerant evaporator has no temperature difference (temperature distribution) between the one side and the other side in the width direction, and the pressure loss when the refrigerant turns from one core to the other at the upper or lower end is small. desired.

Although various configurations of refrigerant evaporators have been developed, it is not easy to meet these two requirements. The conventional refrigerant evaporator shown in FIG. 13 includes a downstream core 200 and an upstream core 205, an upper tank 210 having a refrigerant inlet 211 and a refrigerant outlet 212, and a lower tank 215 having a turn portion. The downstream core 200 and the upstream core 205 have a large number of tubes arranged at predetermined intervals, and the upper end and the lower end are open. The inlet passage 211 of the upper tank 210 communicates with the upper end opening of the downstream core 200, and the outlet passage 212 communicates with the upper end opening of the upstream core 205. The lower tank 215 has a first passage communicating with the lower end opening of the upstream core 200 and a second passage communicating with the lower end opening of the downstream core 205, and the first passage and the second passage are communicated with each other.
Japanese Patent Laid-Open No. 2003-75024

  In the above conventional example, the refrigerant descends the entire tube in the width direction of the downstream core 200 and turns in the lower tank 215, and the refrigerant rises in the tube in the entire width direction of the upstream core 205. The distribution is uniform. Further, since the first passage and the second passage of the lower tank 215 are communicated with each other through an arcuate turn portion, the pressure loss during the turn is small.

  However, it cannot meet the recent demand for controlling the temperature independently on the driver side and on the passenger side. In order to satisfy this requirement, it is necessary to vary the evaporation amount of the refrigerant on one side (left side) and the other side (right side) of the upstream core 200 and the downstream core 205. Since it is difficult to make a difference in the flow rate of the refrigerant between one side and the other side in the tubes constituting the cores 200 and 205, a shield or the like is arranged on one side or the other side to make a difference in the amount of air passing therethrough.

  For example, let us consider a case where the air volume on the other side, that is, the driver side, is smaller than the air volume on one side, that is, on the passenger seat side. On one side where a large amount of air flows, the air and the refrigerant actively exchange heat, the amount of evaporation (vaporization amount) of the refrigerant increases, and a pressure loss occurs due to an increase in volume. On the other hand, since the amount of evaporation is small on the other side of the small air volume, the increase in volume is small and pressure loss does not occur much. As a result, the refrigerant mainly flows on the other side, and the refrigerant does not flow so much on one side where a large cooling action is originally required.

  In consideration of such circumstances, the applicant of this application must first file Japanese Patent Application No. 16-41453 (filed on February 18, 2004) and Japanese Patent Application No. 16-114569 (filed on April 8, 2004). I applied. The basic concept is to cross the two passages 186 and 187 formed in the upper tank member 185 at an intermediate portion in the length direction (core width direction) as shown in FIG. At the upper end, one side 191 a 1 of the downstream core 90 is connected to the other side (not shown) of the upstream core 194 by the upper tank member 185, and the other side 191 b of the downstream core 190 is connected to one side of the upstream core 194 ( (Not shown).

  In this way, the amount of refrigerant rising on one side 191a of the downstream core 190 is large, and the amount of refrigerant rising on the other side 191b is small. As a result of the small amount of refrigerant descending on one side of the upstream core 194 and the large amount of refrigerant rising on the other side, the amount of refrigerant evaporated on the driver side and on the passenger seat side can be made substantially the same. However, many parts are required to form a cross portion in the passage of the upper tank member 185, the structure is complicated, and there is room for improvement in that the cost is likely to increase.

  The present invention has been made in view of the above circumstances, and has a refrigerant evaporator capable of forming a refrigerant cross-flow portion at one end (for example, the upper end) in the length direction of the first core and the second core with a small number of parts and a simple configuration. The purpose is to provide.

  The inventor of the present application forms the tank member for turning the refrigerant with a tubular pipe member, that is, the two pipe members intersect in an X shape, or the two or one pipe members are bent in a spiral shape. The present invention has been completed.

  (1) The refrigerant evaporator according to the first invention of the present application, as described in claim 1, is a first core formed by separating a plurality of first tubes, and a plurality of second tubes juxtaposed with the first cores. And a refrigerant supply passage that is disposed at one end in the longitudinal direction of the first core and the second core and communicates with the first tube, and a refrigerant discharge passage that communicates with the second tube. A first tank member disposed at the other end in the length direction of the first core and the second core and communicating with one side in the width direction of the first core and the other side in the width direction of the second core; The second tank member is disposed at the other end in the length direction of the first core and the second core, and communicates the other side in the width direction of the first core and the one side in the width direction of the second core.

  In this refrigerant evaporator, the first tank member and the second tank member are arranged in an X shape, and the refrigerant flowing on one side in the width direction of the first core passes through the first tank member in the width direction of the second core. The refrigerant that flows to the other side and flows to the other side in the width direction of the first core flows to one side in the width direction of the second core via the second tank member.

  (2) The refrigerant evaporator according to the second aspect of the present invention is the refrigerant evaporator according to the ninth aspect, wherein the first width direction one-side core portion and the first width are formed by separating the plurality of first tubes and aligning in the width direction. A first core including the other side core portion, and a plurality of second tubes spaced apart from each other and the second width direction one side core portion separated from the first width direction one core portion in the thickness direction A second core including a second width direction other side core portion adjacent to the first width direction other side core portion in the length direction, and arranged at one end in the length direction of the first core and the second core and communicated with the first tube A refrigerant supply / discharge member having a refrigerant supply passage and a refrigerant discharge passage communicated with the second tube, a first width direction one-side core portion disposed at the other longitudinal end of the first core and the second core, The second width direction other side core portion is communicated with and the first width direction other side core portion and the second width direction one side core portion are communicated. And the link member, consisting of.

  In this refrigerant evaporator, the refrigerant that has flowed through the first width direction one side core portion flows to the second width direction other side core portion via the tank member, and the refrigerant that has flowed through the first width direction other side core portion is the tank member. It flows through the second width direction one-side core part.

  (1) According to the refrigerant evaporator according to the first invention of the present application, the tank member that turns the refrigerant at the other longitudinal end of the first core and the second core includes the first tank member arranged in an X shape, It consists of a second tank member. As a result, the number of parts is small, the configuration is simple, and the cost can be reduced.

  (2) According to the refrigerant evaporator according to the second invention, the tank member for turning the refrigerant at the other longitudinal end of the first core and the second core has two U-shaped first and second tanks. It consists of a member or one spiral tank member. As a result, the number of parts is small, the configuration is simple, the processing is simple, and the cost can be reduced.

  (3) According to the refrigerant evaporator of claim 2, by the first tank member and the second tank member arranged in an X shape, the width direction one side of the first core and the width direction other side of the second core However, the other side in the width direction of the first core and the one side in the width direction of the second core can be reliably and easily connected. According to the refrigerant evaporator of the third aspect, the evaporation amount of the refrigerant can be independently controlled on one side in the width direction and the other side in the width direction of the first and second cores, and the refrigerant can be controlled by the first and second tank members. The refrigerant easily reaches the first and second outlet portions.

  According to the refrigerant evaporator of the fourth aspect, the first tank member and the second tank member can be easily manufactured. According to the refrigerant evaporator of claim 5, the communication between the first tube of the first core and the first inlet portion of the first tank member, and the second tube of the second core and the second inlet portion of the second tank member. Communication with is reliable. According to the refrigerant evaporator of the sixth aspect, since the refrigerant flows also in the tube group in which the first and second cross portions of the first core and the second core are possible, the width of the first core and the second core. It is prevented that only the central part becomes high in temperature distribution in the direction.

  According to the refrigerant evaporator of the seventh aspect, since the first and second cross portions can also communicate with the first and second tubes, the amount of refrigerant flowing increases. According to the refrigerant evaporator of claim 10, the first width direction one side core portion of the first core and the second width direction other side core of the second core by the U-shaped first tank member and second tank member. And the first width direction other side core portion of the first core and the second width direction one side core portion of the second core can be reliably and easily connected. According to the refrigerant evaporator of the eleventh aspect, the dimension perpendicular to the axis of the tank member can be reduced.

  According to the refrigerant evaporator of the twelfth and fifteenth aspects, the rigidity of the first and second cores is increased, the vibration resistance is improved, and the passage sound of the refrigerant can be suppressed. According to the refrigerant evaporator of the thirteenth and sixteenth aspects, the first and second cross portions can communicate with the second and second tubes. According to the refrigerant evaporator of the fourteenth aspect, the tank member can be formed by one pipe member, and the number of parts can be reduced.

<Overall>
The refrigerant evaporator of the present invention is used in a cooler mode of a refrigeration cycle of a vehicle air-conditioning system, etc., and the mist refrigerant is evaporated by the wind (air) flowing in the vicinity to change to a gaseous refrigerant, and accordingly Removes heat of evaporation from the wind and produces cold air. The type of the refrigerant is not limited, and for example, CO ₂ can be used. There are two types according to the configuration and arrangement of the core, the configuration of the refrigerant supply / discharge member, and the configuration of the first and second tank members.

<First type>
The first type extends in a straight line in the width direction of the first core portion and the second core portion, and a pair of tanks in which tank members that turn the refrigerant at one end in the length direction of the core are arranged in an X shape. A member (see claim 1).

(A) Core The core includes a first core (downstream core) on the downstream side in the wind flow direction and a second core (upstream core) on the upstream side. Each of the cores is a hollow rectangular shape that is formed by a plurality of tubes that are elongated and open at both ends, and has a flat rectangular parallelepiped shape whose thickness is small with respect to width and length (height) as a whole. The first core flows refrigerant from the refrigerant supply passage to the first tank member and the second tank member, and the second core flows refrigerant from the first tank member and the second tank member to the refrigerant discharge passage. That is, the flow direction of the refrigerant is opposite between the first core and the second core.

  In both the first core and the second core, the refrigerant flows separately on one side and the other side in the width direction. The plurality of first tubes and the second tube may be separated from each other (see claim 5), or may be grouped for each of the plurality of tubes (see claim 6). In the latter case, the tubes of each group are connected to each other and communicated with the refrigerant supply passage at one end thereof. The other ends in the length direction of the first tube and the second tube may be twisted in the same direction as the axial direction of the tank member in order to facilitate communication (see claim 7).

  When the refrigerant evaporator is arranged in the vertical direction as a whole, the first core and the second core extend in the vertical direction, and when arranged in the horizontal direction, the first core and the second core extend in the horizontal direction.

(B) Refrigerant supply / discharge member The refrigerant supply / discharge member forms a refrigerant supply passage and a discharge passage at one end in the longitudinal direction of the core (the lower end when arranged in the vertical direction). It has a refrigerant supply passage extending linearly and a refrigerant discharge passage extending linearly.

(C) First tank member, second tank member The first tank member and the second tank member have the refrigerant turn portion at the other end in the longitudinal direction of the first core and the second core (the upper end when arranged in the vertical direction). It is formed, is made of a tubular pipe member, and is arranged in an X shape that is crossed at an intermediate portion.

  The first tank member includes a first inlet portion, a first outlet portion, and a first cross portion. The first inlet is connected to the other end in the length direction of the first tube on one side in the width direction of the first core, and the first outlet is the other end in the length direction of the second tube on the other side in the width direction of the second core. It is communicated to. The first cross part obliquely cuts between the first core and the second core to connect the first inlet part and the first outlet part (see claim 2).

  The second tank member includes a second inlet portion, a second outlet portion, and a second cross portion. The second inlet portion communicates with the other end in the length direction of the first tube on the other side in the width direction of the first core, and the second outlet portion communicates with the second tube on the one side in the width direction of the second core. The second cross portion obliquely cuts between the second core and the first core, passes over or below the first cross portion, intersects, and connects the second inlet portion and the second outlet portion. The first cross part and the second cross part preferably have a flat oval shape whose height is smaller than the width, and can intersect at the center in the axial direction of the first core and the second core (see claim 3).

<Second type>
In the second type, the width direction one side core portion and the width direction other side core portion of the first core portion or the second core portion are shifted in the thickness direction, and one end in the length direction of the first core and the second core. The tank member for turning the refrigerant in the tank includes two U-shaped tank members or one spiral tank member (see claim 9).

(A) Core The first core of the core includes a plurality of first tubes, and includes a first width direction one core portion and a first width direction other core portion aligned in the width direction. The second core is composed of a plurality of second tubes spaced apart from each other, the second width direction one side core portion separated from the first width direction one side core portion in the thickness direction, and the first width direction and the like in the thickness direction. 2nd width direction other side core part adjacent to the side core part. That is, it is slightly shifted in the thickness direction.

(B) Refrigerant supply / discharge member The refrigerant supply / discharge member is disposed at one end (for example, the lower end) in the length direction of the first core, and the refrigerant supply passage communicated with the first tube and the refrigerant discharge communicated with the second tube. Has a passage.

(C) Tank member The tank member is composed of a tubular pipe member, and is disposed at the other end in the length direction of the first core and the second core, and includes a first width direction one side core portion and a second width direction other side core portion. The first width direction other side core portion and the second width direction one side core portion are communicated with each other. There are two cases (a type) and two tank members (b type).

  The a-type tank member is composed of a pair of U-shaped tank members. The first tank member has a first inlet portion communicated with the first width direction one side core portion, a first outlet portion adjacent to the first inlet portion in a direction perpendicular to the axis thereof and communicated with the second width direction other side core portion. And a U-shaped first connection part that connects the first inlet part and the first outlet part. In addition, the second tank member communicates with the second inlet portion communicated with the first widthwise other side core portion, and with a second widthwise one side core portion separated from the second inlet portion in a direction perpendicular to the axis. 2 outlet portions, and a U-shaped second connecting portion that connects the second inlet portion and the second outlet portion (see claim 10).

  The first inlet portion and the second inlet portion are aligned in the axial direction, and the first outlet portion is located between the first inlet portion and the second inlet portion and the second outlet portion in the direction perpendicular to the axis. (See claim 11). In the width direction of the first core and the second core, the first connection portion is located at one end in the width direction and the second connection portion is located at the other end in the width direction (see claim 12). The upper ends of the first tube and the second tube are twisted in the axial direction of the first tank member and the second tank member (see claim 13).

  The b-type tank member is formed of a single spiral tube member, and includes a first straight portion on the outer peripheral side, a second straight portion on the inner peripheral side, and a third straight line between the first straight portion and the second straight portion. Which are juxtaposed in a direction perpendicular to the axis. The first straight portion has a second outlet portion communicated with the second width direction one core portion, the second straight portion has a first outlet portion communicated with the second width direction other core portion, The third straight portion has a first inlet portion communicated with the first width direction one side core portion and a second inlet portion communicated with the first width direction other side core portion (see claim 14).

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First embodiment>
(Constitution)
1 to 4 show a first embodiment. First, a refrigeration cycle of a vehicle air conditioning system will be described with reference to FIG. A compressor 12, a switching valve 13, a radiator (external heat exchanger) 14, an internal heat exchanger 16, an expansion valve 17, and a refrigerant evaporator 20 are disposed on the refrigerant circuit 10.

Next, the refrigerant evaporator (hereinafter referred to as “evaporator”) 20 will be described with reference to FIG. The evaporator 20 includes a refrigerant supply / discharge member 25, a downstream core 30 and an upstream core 35, and two upper tank members 42 and 52. Among them, the refrigerant supply / discharge member 25 has an inlet passage 26 and an outlet passage 28 that are parallel to each other and extend in one direction (from the diagonally lower left to the diagonally upper right in FIG. 2, the width direction). The inlet passage 26 is located on the downstream side (downward and rightward in FIG. 2) in the wind flow direction indicated by the arrow W, and extends over the entire refrigerant supply / discharge member 25. The refrigerant (CO ₂ ) supplied from the left end opening flows in the right direction and rises in the downstream core 30. The outlet passage 28 is located upstream in the flow direction of the wind and extends over the entire refrigerant supply / discharge member 25. After descending in the upstream core 35, the refrigerant is discharged from the left end opening.

  As can be seen from FIG. 2 and FIG. 3, the downstream core 30 includes a large number of rectangular tubes 32 that are long and have a flat cross section, and the numerous tubes 32 are oriented in the width direction of the wind flow direction. The lower end opened in communication with the inlet passage 26. A large number of fins 33 are interposed between adjacent tubes in order to increase the efficiency of heat exchange. The upstream core 35 basically has the same configuration as the downstream core 30, and a large number of rectangular tubes 37 having a long shape and a flat cross section are arranged vertically with the width direction being the direction of the wind flow. The opened lower end communicates with the outlet passage 28.

  As shown in FIG. 3, the upper tank member 40 is composed of a pair of upper tank members 42 and 52 that are arranged with their intermediate portions in the length direction crossed (crossed in an X shape). The first upper tank member 42 has a cylindrical cross section and has an inlet portion 43 positioned above the left half 33a of the downstream core 30, an outlet portion 45 positioned above the right half 38b of the upstream core 35, and both. And an oblique cut portion (cross portion) 47 to be connected. One end (right end) is closed, and the other end (left end) opening is closed with a cap 48. The lower surface of the inlet portion 43 communicates with the upper end opening of the tube in the left half 33a, and the lower surface of the outlet portion 45 communicates with the upper end opening of the right half 38b. The cross portion 47 does not communicate with the downstream core 30 or the upstream core 35.

  The second upper tank member 52 has a cylindrical shape in cross section, an inlet portion 53 located above the right half 35b of the upstream core 35, an outlet portion 55 located above the left half 38a of the downstream core 30, and both And an oblique cut portion (cross portion) 57 to be connected. The right end is closed and the left end opening is closed with a cap 58. The lower surface of the inlet portion 53 communicates with the upper end opening of the tube of the right half 33b, and the lower surface of the outlet portion 55 communicates with the upper end opening of the left half 38a. The cross portion 57 does not communicate with the downstream core 30 or the upstream core 35.

  The inlet portion 43 and the inlet portion 53 are at the same height, and the outlet portion 45 and the outlet portion 55 are at the same height. The cross part 57 passes over the cross part 47 and intersects, and both are brazed.

  As shown in FIGS. 3 and 4, the cross portion 47 of the first upper tank member 42 and the cross portion 57 of the second upper tank member 52 have a horizontally long oval shape whose height dimension is smaller than the horizontal dimension. , Both overlap in the vertical direction. As shown in FIGS. 4A and 4B, two elongated cylindrical pipe members 42A and 52A are prepared, and a cross portion 47 is formed at an intermediate portion of one pipe member 42A. A cross part 57 is formed in an intermediate part of the other pipe member 52A. In a state where both the cross portions are overlapped, they are compressed in the thickness direction (height) and crushed until the minor axis becomes about half of the original diameter.

(Function)
In the cooler mode, the refrigerant (CO ₂ ) compressed by the compressor 12 in FIG. 1 reaches the radiator 14 through the switching valve 13 and becomes high-pressure and low-temperature refrigerant by heat exchange with high-temperature air. Thereafter, the refrigerant becomes low-pressure and low-temperature refrigerant by the internal heat exchanger 16 and the expansion valve 17 and flows into the evaporator 20 to cool the air in the passenger compartment. Thereafter, after the gas and liquid are separated in the liquid receiving tank 18, the refrigerant becomes a high-pressure and high-temperature refrigerant in the compressor 12.

  The operation of the evaporator 20 will be described in detail with reference to FIGS. The refrigerant is supplied from the inlet passage 26 of the refrigerant supply / discharge member 25 and flows upward (arrow a) in the tube of the left half 33 a of the downstream core 30. At the upper end of the tube 32, it flows into the inlet portion 43 of the upper first tank member 42 and flows to the outlet portion 45 via the cross portion 47 (arrow x). Thereafter, the tube 37 in the right half 38 b of the upstream core 35 is lowered (arrow b) and discharged from the outlet passage 28 of the lower tank member 25.

  At the same time, the refrigerant supplied from the inlet passage 26 of the refrigerant supply / discharge member 25 to the right half 33b of the downstream core 30 flows upward in the tube 32 of the right half 33b (arrow c), 2 flows into the inlet 53 of the tank member 52 and flows to the outlet 55 via the cross 57 (arrow y). Thereafter, the tube 37 in the left half 38 a of the upstream core 35 is lowered (arrow d) and discharged from the outlet passage 28 of the refrigerant supply / discharge member 25.

  The tubular upper tank members 42 and 52 can be formed by drawing. Further, as shown in FIG. 7, the first portions 91 and 96 and the second portions 92 and 97 that are parallel and shifted in the longitudinal direction, and the third portions 93 and 98 that extend in a direction orthogonal to both and connect the two portions are provided. The two metal plates 90 and 95 are pressed to form grooves 94 and 99 at the center in the width direction. Then, the 1st upper tank member 42 is completed by joining the both edge parts of both metal plates. The second upper tank member 42 is similarly manufactured. Such a tank member is suitable when the pressure resistance may be small and can be processed with a thin wall, so that the cost can be reduced.

(effect)
According to the evaporator 20, the evaporation amount of the refrigerant can be independently controlled by the left halves 33a and 38b and the right halves 33b and 38b of the downstream core 30 and the upstream core 35. For example, consider a case where the right halves 33b and 38b of the first and second cores 30 and 35 are covered with a shield member to reduce the air volume. In this case, the amount of refrigerant rising in the left half 33a of the downstream core 30 is large, and the amount of refrigerant rising in the right half 33b is small. At the upper end, the first upper tank member 42 connects one side 33a of the downstream core 32 to the other side 38b of the upstream core 35, and the second tank member 52 connects the other side 33b of the downstream core 30 to the upstream core. 35 is connected to one side 38a. As a result, the amount of refrigerant descending one side 38a of the upstream core 35 is small and the amount of refrigerant ascending the other side 38b is large. As a result, the evaporation amount of the refrigerant is almost the same between the driver side and the passenger seat side. To the extent possible.

  Further, the configuration of the upper tank member 40 for independently controlling the evaporation amounts of the left halves 33a and 38a and the right halves 33b and 38b of the downstream core 30 and the upstream core 35 is simple. The upper tank member 40 includes only a first upper tank member 42 and a second upper tank member 52 that are arranged in an X shape. Each of the tank members 42 and 52 may include inlet portions 43 and 53 having an opening on the lower surface, outlet portions 45 and 55 having an opening on the lower surface, and cross portions 47 and 57 connecting them. Since a general-purpose pipe member can be used, the cost can be reduced.

  Further, the cross portion 47 of the first upper tank member 42 and the cross portion 57 of the second upper tank member 52 have an oval cross section, and have a smaller cross sectional area than the cylindrical inlet portions 42 and 53 and the outlet portions 45 and 55. . Therefore, since the refrigerant flows from the inlet portions 43 and 54 to the outlet portions 45 and 55, the flow velocity is improved when passing through the cross portions 47 and 57. As a result, the refrigerant can easily reach the ends of the outlet portions 45 and 55.

  In addition, since the cross portion 47 of the first tank member 42 and the cross portion 57 of the second tank member 52 are brazed to improve rigidity, the passage sound of the refrigerant is suppressed and vibration resistance is improved. improves.

<Modification>
(1) FIG. 5 shows a first modification of the first embodiment. In this modification, a large number of tubes of the downstream core 70 are divided into three groups, and a plurality of tubes in each group are connected to each other. The left lower end of the left tube group 72 communicates with the inlet passage 26, and the right upper end communicates with the inlet portion 43. The lower left end of the central tube group 73 communicates with the inlet passage 26, and the upper right end communicates with the inlet portion 53. The lower left end of the right tube group 74 communicates with the inlet passage 26, and the upper right end communicates with the inlet portion 53. The multiple tubes 78 in the upstream core have the same configuration as the multiple tubes 72 in the downstream core.

According to this first modification, in addition to the effects of the first embodiment, the following specific effects can be obtained. In other words, the refrigerant flows from the inlet passage 26 to the inlet portion 53 by the central tube group 73 disposed also in the lower region e of the crossing portion between the cross portion 47 and the cross portion 57. Since the refrigerant can also flow through the middle tube group 73 of the downstream core 70 and the upstream core 78, only the intermediate portion in the temperature distribution in the width direction of the downstream core 70 is prevented. as a result,
The performance of the refrigerant evaporator is improved.

  (2) In the second modification shown in FIG. 6, the upper end 83 of the tube 82 in the left half 81 a of the downstream core 80 is twisted to extend the upper end opening in the extending direction (axial direction) of the inlet 43 of the upper tank member 42. To match. The same applies to the right half (not shown).

  In this way, in addition to the effects of the first embodiment, the connection between the cross portion 47 positioned below the cross portion 57 and the upper end opening of the tube 82 and the like positioned in the intermediate region f in the width direction of the core 80 is achieved. It becomes possible, the circulation amount of the refrigerant increases, and the cooling capacity is improved.

<Second embodiment>
(Constitution)
The second embodiment will be described with reference to FIGS. In the second embodiment, the left half 113 and the right half 116 of the downstream core 110 are aligned, but the left half 123 and the right half 126 of the upstream core 120 are in the thickness direction of the upstream core, that is, the wind. It is shifted in the flow direction. In relation to this, the refrigerant discharge passage of the refrigerant supply / discharge member (not shown) is bent in the middle thereof, and the tank member 130 is separated from the three parts arranged in the direction perpendicular to the axis, that is, in the wind flow direction. Become.

  Hereinafter, the description will be focused on the configuration different from the first embodiment, and the description of the first embodiment will be used for the common configuration.

  In FIG. 8, the downstream core 110 is formed by separating the tubes 111, and includes a width direction one side core portion (hereinafter referred to as “one side core portion”) 113 and a width direction other side core portion (hereinafter referred to as “other side core portion”). 116, which are in the same plane and aligned in the width direction.

  The upstream core 120 is formed by separating tubes 121, and includes a one-side core portion 123 and an other-side core portion 126. In the thickness direction, the one-side core part 123 is slightly separated from the one-side core part 113, and the other-side core part 126 is close to the other-side core part 116. As a result, the one-side core portion 123 and the other-side core portion 126 are displaced in the thickness direction.

  Note that the refrigerant supply / discharge member is disposed at the lower ends of the downstream core 110 and the upstream core 120, a straight refrigerant supply passage (not shown) communicating with the first tube 111, and the second tube 121 bent in the middle. And a refrigerant discharge passage (not shown) communicated with the refrigerant.

  In FIG. 9, the tank member 130 includes two U-shaped tank members 132. The first tank member 132 is disposed at the upper ends of the downstream core 110 and the upstream core 120, and communicates with the first tube 111 of the one-side core portion 113 and the second inlet portion 133 of the other-side core portion 126. A first outlet 135 connected to the tube 121 and a U-shaped first connecting part 137 connecting the first inlet 133 and the first outlet 135 are included. The first inlet portion 133 and the first outlet portion 135 are close (contacted) in the direction perpendicular to the axis, and the first connection portion 137 is rapidly folded back. The upper end of the tube 111 is twisted in the axial direction of the first inlet portion 133 and the second inlet portion 143.

  The second tank member 142 is disposed at the upper ends of the downstream core 110 and the upstream core 120, and the second inlet 143 communicated with the first tube 111 of the other core 114, and the tube 121 of the one core 123. A second outlet portion 145 communicated with the second outlet portion 145, and a U-shaped second connecting portion 147 connecting the second inlet portion 143 and the second outlet portion 145. The second inlet portion 143 and the second outlet portion 145 are slightly separated from each other in the direction perpendicular to the axis, and the second connecting portion 147 is gently curved. The upper end of the tube 121 is twisted in the axial direction of the first outlet part 135 and the second outlet part 145.

In the direction perpendicular to the axis, the first outlet portion 135 is sandwiched between the short first inlet portion 133 and the second inlet portion 143 and the long second outlet portion 145 from both sides. In the axial direction, the short first inlet portion 133 and the short second inlet portion 143 are on the same axis, and the ends face each other. The length of the long second outlet part 145 is about the sum of the length of the short first inlet part 133 and the length of the second inlet part, and the length of the first outlet part 135 is the first inlet part 133 or the second inlet part. It is an average degree of the length of the part 143 and the length of the 2nd exit part 135. (Operation effect)
8 and 9, the refrigerant flows upward in the tube 111 in the left half 113 of the downstream core 110. At the upper end of the tube 111, it flows into the first inlet portion 133 of the first tank member 132, makes a U-turn at the first connection portion 137, and flows to the first outlet portion 135. Thereafter, the tube 121 in the right half 126 of the upstream core 120 is lowered.

  At the same time, the refrigerant supplied to the right half 116 of the downstream core 110 flows upward in the tube 111 of the right half 116, flows into the second inlet 143 of the second tank member 142 at the upper end, and enters the second connection portion. 147 makes a U-turn and flows to the second outlet 145. Thereafter, the tube 121 in the left half 123 of the upstream core 120 is lowered.

  According to the second embodiment, basically the same effect as the first embodiment can be obtained. In addition, since the connecting portion 147 of the first tank member 142 and the connecting portion 157 of the second tank member 152 have both U shapes, the manufacture thereof is easy. Further, since the first outlet portion 135 is disposed between the first inlet portion 133 and the second inlet portion 143 and the second outlet portion 145 in the direction perpendicular to the axis, the dimension in this direction can be reduced.

<Modification>
(1) FIG. 10 shows a modification of the second embodiment. This modification is different from the second embodiment in that the tank member 150 is formed of a single spiral pipe member. More specifically, the tank member 150 includes a first straight portion 155 on the outer peripheral side, a second straight portion 165 on the inner peripheral side, and a third straight portion 160 that connects the two. The three straight portions 155, 160 and 165 are in contact with each other and are parallel.

  The first straight part 155 is located on the upstream side and has a second outlet part 156 on the left half, and the third straight part 165 is located on the downstream side and the first inlet part 161 on the left half and the second inlet on the right half. And the third straight part 165 has a first outlet part 166. The first straight portion 155 and the third straight portion 160 are connected by a U-shaped connecting portion 171, and the third straight portion 160 and the second straight portion 165 are connected by a U-shaped connecting portion 172.

  The configurations of the second outlet portion 156 and the first outlet portion 166 are the same as those of the second embodiment. In contrast, the first inlet 161 and the second inlet 162 are formed in the left half and the right half of the continuous second straight line 160, and the separator 163 is interposed between them.

  According to this modification, in addition to the effect of the second embodiment, the tank member 150 can be manufactured with a single pipe, so that the effect of reducing the number of parts can be obtained.

  (2) In addition, it is good also as the core 180 which integrated the tube of the left half 113 of the downstream core 110 and the tube of the right half 116 which were arrange | positioned separately in the said 2nd Example, as shown in FIG. . If it does in this way, the rigidity of a downstream side core will improve and the passage sound of a refrigerant can be controlled further.

It is explanatory drawing of the vehicle air conditioning system to which the Example of this invention is applied. 1 is a perspective view showing a first embodiment of the present invention. It is a principal part enlarged view of FIG. (A) is explanatory drawing of the manufacturing method of an upper tank member, (b) is a cross-sectional view of the cross part of (a). It is a perspective view which shows the modification of the tube of the core of 1st Example. It is a perspective view which similarly shows the 2nd modification. It is a perspective view which shows the modification of the upper tank member of 1st Example. It is a perspective view which shows the tube upper end of the 1st core and 2nd core of 2nd Example of this invention. It is a perspective view which similarly shows a tank member. It is a perspective view which shows the modification of the tank member of 2nd Example. It is a perspective view which shows the modification of the core of 2nd Example. It is a perspective view which shows the basic concept of this invention. It is a perspective view which shows the conventional evaporator.

Explanation of symbols

20: Evaporator 25: Refrigerant supply / discharge member 26: Refrigerant supply passage 28: Refrigerant discharge passage 30: First core 32: First tube 33a: One side in the width direction 33b: Other side in the width direction 35: Second core 37: First tube 38a: One side in the width direction 38b: The other side in the width direction 40: Upper tank member 42: First upper tank member 43: First inlet portion 45: First outlet portion 47: First cross portion 52: Second upper portion Tank member 53: second inlet portion 55: second outlet portion 57: second cross portion

Claims (17)

A first core (30) formed by separating a plurality of first tubes (32);
A second core (35) juxtaposed with the first core, wherein a plurality of second tubes (37) are spaced apart;
A refrigerant that is disposed at one end in the longitudinal direction of the first core and the second core and has a refrigerant supply passage (26) communicated with the first tube and a refrigerant discharge passage (28) communicated with the second tube. A supply / discharge member (25);
The first core is disposed at the other end in the length direction of the first core and the second core, and communicates with the width direction one side (33a) of the first core and the width direction other side (38b) of the second core. A tank member;
The second core is disposed at the other end in the length direction of the first core and the second core, and communicates with the width direction other side (33b) of the first core and the width direction one side (38a) of the second core. A tank member,
The first tank member and the second tank member are arranged in an X shape, and the refrigerant that has flowed through one side in the width direction of the first core passes through the first tank member in the width direction of the second core, etc. The refrigerant evaporator is characterized in that the refrigerant flowing to the side and flowing on the other side in the width direction of the first core flows to one side in the width direction of the second core via the second tank member. The first tank member (42) is tubular, and includes a first inlet portion (43) communicating with the first tube on one side in the width direction of the first core, and the first port on the other side in the width direction of the second core. A first outlet (45) communicating with the two tubes, and a first cross that obliquely cuts between the first core and the second core and connects the first inlet and the first outlet. Part (47),
The second tank member (52) is tubular and has a second inlet portion (53) communicated with the first tube on the other side in the width direction of the first core, and the second tank member (52) on the one side in the width direction of the second core. A second outlet portion (55) communicated with the two tubes, and a cross section between the first core and the second core and intersecting the first cross portion, and the second inlet portion and the second outlet. The refrigerant evaporator according to claim 1, further comprising a second cross part (57) connecting the parts.   The said 1st cross part and the said 2nd cross part are located in the center in the width direction of the said 1st core and the said 2nd core, and have an ellipse shape with small height with respect to a width | variety. Refrigerant evaporator.   The refrigerant evaporator according to claim 3, wherein the first tank member and the second tank member are manufactured by drawing or joining two pressed plate members.   The plurality of first tubes of the first core and the plurality of second tubes of the second core are separated from each other and communicated with the first tank member and the second tank member at respective one ends. 2. The refrigerant evaporator according to 2. The plurality of first tubes of the first core is composed of a plurality of tube groups, the tubes of each tube group are connected to each other, and one end of each tube group is communicated with the first tank member,
The plurality of second tubes of the second core includes a plurality of tube groups, the tubes of the tube groups are connected to each other, and one end of each of the tube groups is in communication with the second tank member. 2. The refrigerant evaporator according to 2.   The refrigerant evaporator according to claim 2, wherein one end of the first tube and one end of the second tube are twisted in the axial direction of the first tank member and the second tank.   The refrigerant supply / discharge member is disposed below and the first tank and the second tank are disposed above, and the first core is located on the downstream side and the second core member is located on the upstream side in the wind flow direction. The refrigerant evaporator according to claim 2, which is located in A first core including a first width direction one side core portion (113) and a first width direction other side core portion (116) which are formed by separating a plurality of first tubes (111) and are aligned in the width direction. (110),
A plurality of second tubes (121) are provided to be spaced apart from each other, the second width direction one side core portion (123) separated from the first width direction one side core portion in the thickness direction, and the thickness direction in the thickness direction. A second core (120) including a second width direction other side core portion (126) adjacent to the first width direction other side core portion;
A refrigerant supply / discharge member disposed at one end in the longitudinal direction of the first core and the second core member, and having a refrigerant supply passage communicated with the first tube and a refrigerant discharge passage communicated with the second tube; ,
The first core and the second core are arranged at the other end in the length direction and communicate with the first width direction one side core portion and the second width direction other side core portion, and the first width direction other side. A tank member (130) communicating the side core part and the second width direction one side core part,
The refrigerant that has flowed through the first width direction one core portion flows to the second width direction other core portion via the tank member, and the refrigerant that has flowed through the first width direction other core portion is the tank member. The refrigerant evaporator flows through the second width direction one-side core portion. The tank member is connected to the first inlet portion (133) communicated with the first width direction one side core portion, and close to the first inlet portion in a direction perpendicular to the axis thereof and communicated with the second width direction other side core portion. A U-shaped first tank member (132) having a first outlet part (135) and a first connection part (137) connecting the first inlet part and the first outlet part;
A second inlet part (143) communicated with the first widthwise other side core part, a second outlet communicated with the second widthwise one side core part at a distance from the second inlet part in a direction perpendicular to the axis. And a U-shaped second tank member (142) having a second connection part (147) for connecting the second inlet part and the second outlet part. The refrigerant evaporator as described.   The first inlet and the second inlet are aligned in the axial direction, and the first outlet and the first outlet are between the first inlet and the second inlet and the second outlet in the direction perpendicular to the axis. The refrigerant evaporator according to claim 10, wherein the portion is located.   The first width direction one side core portion and the first width direction other side core portion of the first core are integrated, and the second width direction one side core portion and the second width direction other side core of the second core are integrated. The refrigerant evaporator according to claim 11, which is integral with the unit.   The refrigerant evaporator according to claim 9, wherein one ends of the first tube and the second tube are twisted in an axial direction of the first tank member and the second tank member.   The tank member is formed of a single spiral tube member, the first straight portion (155) on the outer peripheral side, the second straight portion (165) on the inner peripheral side, and the first straight portion and the second straight portion. A first straight portion having a second outlet portion (156) communicated with the second widthwise one-side core portion, wherein the second straight portion is A first inlet portion (161) having a first outlet portion (166) communicated with the second widthwise other side core portion, wherein the third straight portion is communicated with the first widthwise one side core portion. The refrigerant evaporator according to claim 9, further comprising a second inlet portion (162) communicated with the first width-direction other-side core portion.   The first width direction one side core portion and the first width direction other side core portion of the first core are integrated, and the second width direction one side core portion and the second width direction other side core of the second core are integrated. The refrigerant evaporator according to claim 14, which is integral with the unit.   The refrigerant evaporator according to claim 14, wherein one ends of the first tube and the second tube are twisted in an axial direction of the first tank member and the second tank member.   The refrigerant supply / discharge member is disposed below and the first tank and the second tank are disposed above, and the first core is on the downstream side and the second core member is on the upstream side in the wind flow direction. The refrigerant evaporator according to claim 10 or 14, wherein

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