JP5195300B2

JP5195300B2 - Refrigerant evaporator

Info

Publication number: JP5195300B2
Application number: JP2008280893A
Authority: JP
Inventors: 健吾文; 由彦薗田
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2008-10-31
Filing date: 2008-10-31
Publication date: 2013-05-08
Anticipated expiration: 2028-10-31
Also published as: JP2010107131A

Description

本発明は、空気等の被冷却流体と冷媒との間で熱交換を行い、被冷却流体を冷却する冷媒蒸発器に関する。 The present invention relates to a refrigerant evaporator that performs heat exchange between a cooled fluid such as air and a refrigerant to cool the cooled fluid.

近年、車両用空調装置において、運転席と助手席の風量を独立制御することが要求されている。この要求に対し、蒸発器の通過風量を幅方向において左右独立に制御することで対応してきている。 In recent years, in an air conditioner for a vehicle, it is required to independently control the air volume of a driver seat and a passenger seat. This requirement has been addressed by controlling the flow rate of air passing through the evaporator independently in the width direction.

従来、チューブを縦置きに配置する場合の蒸発器において通過風量を左右独立に制御する場合、良好な温度分布を得るために、タンク内にコア部の幅方向に冷媒流れを分割するセパレータを挿入し、コア部の左右を冷媒が違うターンにて流通するようにした冷媒蒸発器が提案されている（例えば、特許文献１参照）。 Conventionally, when the flow rate of air flow is controlled independently on the left and right in an evaporator when the tubes are placed vertically, a separator that divides the refrigerant flow in the width direction of the core is inserted in the tank to obtain a good temperature distribution. However, a refrigerant evaporator has been proposed in which the refrigerant flows through the left and right sides of the core portion in different turns (see, for example, Patent Document 1).

なお、本明細書で、左右方向とは、空気流れ方向に対面する直交面におけるチューブが積層されているコア幅方向に対する左右を意味しており、チューブの積層方向と一致している。
特開２００４−４４８５１号公報 In the present specification, the left-right direction means the left-right direction with respect to the core width direction in which the tubes in the orthogonal plane facing the air flow direction are stacked, and coincides with the stacking direction of the tubes.
JP 2004-44851 A

しかしながら、上記特許文献１に記載の冷媒蒸発器では、冷媒の流通距離が長くなるので、冷媒流れの圧力損失が大きくなり、冷媒蒸発器の性能向上の妨げとなるという問題がある。 However, the refrigerant evaporator described in Patent Document 1 has a problem in that since the refrigerant flow distance becomes long, the pressure loss of the refrigerant flow increases, which hinders improvement in the performance of the refrigerant evaporator.

本発明は、上記点に鑑み、良好な温度分布を得つつ、冷媒流れの圧力損失を低減することができる冷媒蒸発器を提供することを目的とする。 An object of this invention is to provide the refrigerant evaporator which can reduce the pressure loss of a refrigerant | coolant flow, obtaining a favorable temperature distribution in view of the said point.

上記目的を達成するため、請求項１に記載の発明では、被冷却流体の流れ方向に直列に配置された第１蒸発部（１）および第２蒸発部（２）を備え、第１蒸発部（１）および第２蒸発部（２）は、それぞれ、冷媒通路を構成するチューブ（１４、２４）を被冷却流体の流れ方向と直交する方向に複数本積層することにより構成されたコア部（１１、２１）と、複数のチューブ（１４、２４）の長手方向の両端部に接合され、チューブ（１４、２４）への冷媒の分配もしくはチューブ（１４、２４）からの冷媒の集合を行う一対のタンク部（１２、１３、２２、２３）とを有しており、第１蒸発部（１）の一対のタンク部（１２、１３）のうちいずれか一方のタンク部（１２）に、当該一方のタンク部（１２）内をチューブ（１４）の積層方向に仕切る第１仕切部材（１７）を配設することで、第１蒸発部（１）のコア部（１１）が、チューブ（１４）の積層方向に第１ターン部（１１ａ）と第２ターン部（１１ｂ）の２つのみに分割されており、第２蒸発部（２）の一対のタンク部（２２、２３）のうちいずれか一方のタンク部（２２）に、当該一方のタンク部（２２）内をチューブ（２４）の積層方向に仕切る第２仕切部材（２７）を配設することで、第２蒸発部（２）のコア部（２１）が、チューブ（２４）の積層方向に第３ターン部（２１ａ）と第４ターン部（２１ｂ）の２つのみに分割されており、第１ターン部（１１ａ）は、第２ターン部（１１ｂ）より冷媒流れ上流側に配置されており、第３ターン部（２１ａ）は、第４ターン部（２１ｂ）より冷媒流れ上流側に配置されており、第１ターン部（１１ａ）は、第１蒸発部（１）および第２蒸発部（２）に冷媒を流入させる冷媒流入配管（３）に接続される第１冷媒流入口（１８）を有しており、第３ターン部（２１ａ）は、冷媒流入配管（３）に接続される第２冷媒流入口（２８）を有しており、第２ターン部（１１ｂ）における冷媒流れ下流側の端部と、第４ターン部（２１ｂ）における冷媒流れ下流側との端部が、連結部（４）により接続されており、第１ターン部（１１ａ）は、第１蒸発部（１）のコア部（１１）におけるチューブ（１４）の積層方向の一側に配置されているとともに、第２ターン部（１１ｂ）は第１蒸発部（１）のコア部（１１）におけるチューブ（１４）の積層方向の他側に配置されており、第３ターン部（２１ａ）は、第２蒸発部（２）のコア部（２１）におけるチューブ（２４）の積層方向の他側に配置されているとともに、第４ターン部（２１ｂ）は、第２蒸発部（２）のコア部（２１）におけるチューブ（２４）の積層方向の一側に配置されており、第１ターン部（１１ａ）と第４ターン部（２１ｂ）が、被冷却流体の流れ方向に直列に配置されているとともに、第２ターン部（１１ｂ）と第３ターン部（２１ａ）が、被冷却流体の流れ方向に直列に配置されており、冷媒流入配管（３）、連結部（４）、および第１、第２仕切部材（１７、２７）は、チューブ（１４）の長手方向の両端部のうちいずれか一方の同じ端部側に配置されており、さらに、連結部（４）は、チューブ（２４）の積層方向の中央部に配置されて第１蒸発部（１）の一方のタンク部（１２）内と第２蒸発部（２）の一方のタンク部（２２）内とを連通するものであることを特徴としている。 In order to achieve the above object, according to the first aspect of the present invention, the first evaporating unit (1) and the second evaporating unit (2) arranged in series in the flow direction of the fluid to be cooled are provided. The core part (1) and the second evaporation part (2) are configured by laminating a plurality of tubes (14, 24) constituting the refrigerant passage in a direction perpendicular to the flow direction of the fluid to be cooled ( 11, 21) and a pair of pipes (14, 24) that are joined to both ends in the longitudinal direction and distribute refrigerant to the tubes (14, 24) or collect refrigerant from the tubes (14, 24). Tank portion (12, 13, 22, 23), and one tank portion (12) of the pair of tank portions (12, 13) of the first evaporation portion (1) The stacking direction of the tube (14) in one tank part (12) By disposing the first partition member (17) for partitioning, the core portion (11) of the first evaporation portion (1) has the first turn portion (11a) and the second turn portion in the stacking direction of the tubes (14). only two (11b) is divided into, on one of the tank portions either of the pair of tank portions of the second evaporator section (2) (22, 23) (22), said one tank portion (22 ) Is disposed in the stacking direction of the tube (24) so that the core portion (21) of the second evaporation section (2) is aligned in the stacking direction of the tube (24). 3 turn portion and (21a) is divided two only of the fourth turn portions (21b), a first turn portion (11a) is disposed in the refrigerant flow upstream side of the second turn portion (11b) The third turn part (21a) is arranged upstream of the refrigerant flow from the fourth turn part (21b). The first turn part (11a) is connected to a refrigerant inlet pipe (3) through which refrigerant flows into the first evaporator (1) and the second evaporator (2). The third turn part (21a) has a second refrigerant inlet (28) connected to the refrigerant inflow pipe (3), and the refrigerant flow in the second turn part (11b) The end of the downstream side and the end of the fourth turn part (21b) on the downstream side of the refrigerant flow are connected by the connecting part (4) , and the first turn part (11a) is connected to the first evaporation part ( 1) is arranged on one side of the tube (14) in the stacking direction of the core (11), and the second turn part (11b) is a tube (11) in the core part (11) of the first evaporation part (1). 14) is arranged on the other side of the stacking direction, and the third turn part (21a) is the second evaporation The fourth turn part (21b) is disposed on the other side in the stacking direction of the tube (24) in the core part (21) of the part (2), and the core part (21) of the second evaporation part (2). The first turn part (11a) and the fourth turn part (21b) are arranged in series in the flow direction of the fluid to be cooled, and the first turn part (11a) and the fourth turn part (21b) The two turn part (11b) and the third turn part (21a) are arranged in series in the flow direction of the fluid to be cooled, and the refrigerant inflow pipe (3), the connection part (4), and the first and second partitions. The members (17, 27) are arranged on the same end side of either one of the longitudinal ends of the tube (14), and the connecting portion (4) is the stacking direction of the tubes (24). One tank part (1) of the first evaporation part (1) It is characterized in that) in the one tank portion of the second evaporator section (2) and in (22) is to communicate.

これによれば、冷媒流入配管（３）から各蒸発部（１、２）に流入した冷媒は、それぞれのコア部（１１、２１）で左右方向にＵターンした後、連結部（４）を介して合流するようになっているので、各コア部（１１、２１）におけるターン数を２つのみにする、すなわちターン数を少なくすることができる。このため、冷媒の流通距離を短縮することができるので、冷媒流れの圧力損失を低減することができる。
このとき、各蒸発部（１、２）において、コア部（１１、２１）の左右方向で冷媒をＵターンさせることができるので、良好な温度分布を得ることができる。したがって、良好な温度分布を得つつ、冷媒流れの圧力損失を低減することが可能となる。 According to this, the refrigerant that has flowed from the refrigerant inflow pipe (3) into each evaporation section (1, 2) makes a U-turn in the left-right direction at the respective core sections (11, 21), and then connects the connection section (4). since so as to merge through, the number of turns in each of the core portions (11, 21) only two to, that is, to reduce the number of turns. For this reason, since the circulation distance of a refrigerant | coolant can be shortened, the pressure loss of a refrigerant | coolant flow can be reduced.
At this time, in each evaporation part (1, 2), since a refrigerant | coolant can be made U-turn in the left-right direction of a core part (11, 21), favorable temperature distribution can be obtained. Therefore, it is possible to reduce the pressure loss of the refrigerant flow while obtaining a good temperature distribution.

ところで、第１、第２蒸発部（１、２）におけるチューブ積層方向の一側、すなわちコア部（１１、２１）の左右方向の一側を流れる被冷却流体の流量が、第１、第２蒸発部（１、２）におけるチューブ積層方向の他側、すなわちコア部（１１、２１）の左右方向の他側を流れる被冷却流体の流量より多い場合、冷媒流入配管（３）からの冷媒は、通過する被冷却流体の流量が少ないチューブ積層方向の他側に配置された第２蒸発部（２）の第３ターン部（２１ａ）により多く流入し、通過する被冷却流体の流量が多いチューブ積層方向の一側に配置された第１蒸発部（１）の第１ターン部（１１ａ）に流入し難くなる。 By the way, the flow rate of the fluid to be cooled flowing on one side in the tube stacking direction in the first and second evaporators (1, 2), that is, on the one side in the left-right direction of the core (11, 21) is the first and second. When the flow rate of the fluid to be cooled flowing on the other side in the tube stacking direction in the evaporation units (1, 2), that is, the other side in the left-right direction of the core unit (11, 21) is larger, the refrigerant from the refrigerant inflow pipe (3) is A tube with a large flow rate of the cooled fluid passing through the third turn portion (21a) of the second evaporation unit (2) disposed on the other side of the tube stacking direction with a small flow rate of the cooled fluid passing therethrough It becomes difficult to flow into the first turn part (11a) of the first evaporation part (1) arranged on one side in the stacking direction.

このとき、請求項１に記載の発明によれば、第１ターン部（１１ａ）の被冷却流体流れ上流側もしくは下流側には、第２蒸発部（２）の第４ターン部（２１ｂ）が直列に配置されている。第４ターン部（２１ｂ）は、流入する冷媒量の多い第３ターン部（２１ａ）と連通しているので、第４ターン部（２１ｂ）を流れる冷媒量は多くなる。このため、通過する被冷却流体の流量が多いチューブ積層方向の一側に、冷媒流量の少ない第１ターン部（１１ａ）と、冷媒流量の多い第４ターン部（２１ｂ）とを配置することができる。したがって、通過する被冷却流体の流量が多い、すなわち負荷の大きい領域にも、冷媒を多く流すことができるので、被冷却流体を冷却するために必要な冷媒量を確保することが可能となる。 At this time, according to the first aspect of the present invention, the fourth turn portion (21b) of the second evaporation portion (2) is located upstream or downstream of the flow of the fluid to be cooled of the first turn portion (11a). They are arranged in series. Since the fourth turn part (21b) communicates with the third turn part (21a) with a large amount of refrigerant flowing in, the amount of refrigerant flowing through the fourth turn part (21b) increases. For this reason, the first turn part (11a) with a small refrigerant flow rate and the fourth turn part (21b) with a large refrigerant flow rate may be arranged on one side in the tube stacking direction where the flow rate of the fluid to be cooled is large. it can. Therefore, since a large amount of refrigerant can flow even in a region where the flow rate of the fluid to be cooled is large, that is, the load is large, it is possible to secure an amount of refrigerant necessary for cooling the fluid to be cooled.

請求項１に記載の発明によれば、第１、第２蒸発部器（１、２）のコア部（１１、２１）のスーパーヒート領域（冷媒流れ下流側領域）同士、すなわち第２ターン部（１１ｂ）と第４ターン部（２１ｂ）とが重ならないようにすることができる。このため、第１、第２蒸発部（１、２）のスーパーヒート領域同士が重なることによる温度分布の悪化を回避することが可能となる。 According to the first aspect of the present invention , the superheat regions (the refrigerant flow downstream regions) of the core portions (11, 21) of the first and second evaporators (1, 2), that is, the second turn portion. (11b) and the fourth turn portion (21b) can be prevented from overlapping. For this reason, it becomes possible to avoid the deterioration of the temperature distribution due to the superheat regions of the first and second evaporators (1, 2) overlapping.

また、請求項１に記載の発明による第１〜第４ターン部（１１ａ〜２１ｂ）の上記配置によれば、第１ターン部（１１ａ）を流れる冷媒の流れ方向と、第４ターン部（２１ｂ）を流れる冷媒の流れ方向とが対向流となるので、第１ターン部（１１ａ）と第４ターン部（２１ｂ）を被冷却流体の流れ方向に直列に配置することで、被冷却流体流れ方向で温度分布の悪化領域を互いに打ち消し合うことができる。すなわち、コア部（１１、２１）のチューブ積層方向の一部で、比較的温度が高くなる部分同士、または比較的温度が低くなる部分同士が、被冷却流体の流れ方向に関して、互いに重畳することを少なくできる。このため、温度分布を均一化することが可能となる。 Moreover, according to the said arrangement | positioning of the 1st-4th turn part (11a-21b) by invention of Claim 1, the flow direction of the refrigerant | coolant which flows through a 1st turn part (11a), and a 4th turn part (21b) The flow direction of the refrigerant flowing in the flow direction is a counter flow, and therefore, the first turn portion (11a) and the fourth turn portion (21b) are arranged in series in the flow direction of the cooled fluid, so that the flow direction of the cooled fluid Thus, it is possible to cancel out the deterioration regions of the temperature distribution. That is, in a part of the tube stacking direction of the core portions (11, 21), portions where the temperature is relatively high or portions where the temperature is relatively low overlap each other in the flow direction of the fluid to be cooled. Can be reduced. For this reason, it becomes possible to make temperature distribution uniform.

なお、この欄および特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。 In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の一実施形態について図１〜図４に基づいて説明する。本実施形態は、本発明に係る熱交換器を、空気（被冷却流体）と冷媒との間で熱交換して空気を冷却する車両空調装置用蒸発器に適用したものである。 An embodiment of the present invention will be described with reference to FIGS. In this embodiment, the heat exchanger according to the present invention is applied to an evaporator for a vehicle air conditioner that cools air by exchanging heat between air (cooled fluid) and a refrigerant.

図１は本実施形態に係る蒸発器の斜視図で、図２は本実施形態に係る蒸発器を模式的に示した説明図である。 FIG. 1 is a perspective view of an evaporator according to the present embodiment, and FIG. 2 is an explanatory view schematically showing the evaporator according to the present embodiment.

図１および図２に示すように、本実施形態の蒸発器は、空気流れ方向に直列に配置された２つの蒸発部１、２から構成されている。ここで、２つの蒸発部１、２のうち、空気流れ上流側に配置されるものを第１蒸発部１といい、空気流れ下流側に配置されるものを第２蒸発部２という。 As shown in FIGS. 1 and 2, the evaporator according to the present embodiment includes two evaporators 1 and 2 arranged in series in the air flow direction. Here, of the two evaporators 1 and 2, the one disposed on the upstream side of the air flow is referred to as the first evaporator 1, and the one disposed on the downstream side of the air flow is referred to as the second evaporator 2.

第１蒸発部１および第２蒸発部２の基本的構成は同一であり、それぞれコア部１１、２１と、このコア部１１、２１の上下両側に位置するタンク部１２、１３、２２、２３とを備えている。なお、タンク部１２、１３、２２、２３のうち、コア部１１、２１の上方側に配置されるものを上側タンク部１２、２２といい、コア部１１、２１の下方側に配置されるものを下側タンク部１３、２３ともいう。 The basic configurations of the first evaporation unit 1 and the second evaporation unit 2 are the same. The core units 11 and 21 and the tank units 12, 13, 22, and 23 located on the upper and lower sides of the core units 11 and 21, respectively. It has. Of the tank parts 12, 13, 22, and 23, those disposed above the core parts 11 and 21 are referred to as the upper tank parts 12 and 22, and are disposed below the core parts 11 and 21. Is also referred to as lower tank portions 13 and 23.

ここで、コア部１１、２１は、それぞれ上下方向に延びる複数のチューブ１４、２４と、この複数のチューブ１４、２４相互間に接合されるフィン２５との積層構造からなる。チューブ１４、２４は冷媒通路を構成するもので、断面形状が空気流れ方向に沿って扁平な扁平チューブよりなる。フィン２５は薄板材を波状に曲げ成形したコルゲートフィンであり、チューブ１４、２４の平坦な外面側に接合され空気側伝熱面積を拡大する。 Here, the core parts 11 and 21 have a laminated structure of a plurality of tubes 14 and 24 extending in the vertical direction, respectively, and a fin 25 joined between the plurality of tubes 14 and 24. The tubes 14 and 24 constitute a refrigerant passage, and are formed of a flat tube whose cross-sectional shape is flat along the air flow direction. The fin 25 is a corrugated fin obtained by bending a thin plate material into a wave shape, and is joined to the flat outer surface side of the tubes 14 and 24 to expand the air-side heat transfer area.

チューブ１４、２４とフィン２５はコア部１１、２１の左右方向に交互に積層配置され、このチューブ・フィン積層方向（以下、チューブ積層方向という）の両端部にはコア部１１、２１を補強するサイドプレート１６が配置されている。このサイドプレート１６は、チューブ積層方向の最も外側に位置するフィン２５に接合されている。 The tubes 14 and 24 and the fins 25 are alternately stacked in the left and right direction of the core portions 11 and 21, and the core portions 11 and 21 are reinforced at both ends in the tube and fin stacking direction (hereinafter referred to as tube stacking direction). A side plate 16 is disposed. The side plate 16 is joined to the fins 25 located on the outermost side in the tube stacking direction.

図３は、本実施形態に係る蒸発器の上側タンク部１２、２２近傍を示す分解斜視図である。図３に示すように、本実施形態の上側タンク部１２、２２は、一体化されており、第１蒸発部１のチューブ１４が挿入接合される第１貫通孔５１ａ、および第２蒸発部２のチューブ２４が挿入接合される第２貫通孔５１ｂが形成されたコアプレート５２と、タンク内空間を構成するタンク本体部５３とを備えている。 FIG. 3 is an exploded perspective view showing the vicinity of the upper tank portions 12 and 22 of the evaporator according to the present embodiment. As shown in FIG. 3, the upper tank parts 12 and 22 of this embodiment are integrated, the 1st through-hole 51a in which the tube 14 of the 1st evaporator 1 is inserted and joined, and the 2nd evaporator 2 A core plate 52 having a second through hole 51b into which the tube 24 is inserted and joined, and a tank main body 53 that constitutes a tank internal space.

タンク本体部５３は、第１蒸発部１の上側タンク部１２のタンク内空間を構成する第１タンク本体部５３１と、第２蒸発部２の上側タンク部２２のタンク内空間を構成する第２タンク本体部５３２とを有している。第１、第２タンク本体部５３１、５３２は、それぞれ両端部が開放された、すなわち両端側に開口部を有する半筒状に形成されている。また、第１タンク本体部５３１と第２タンク本体部５３２とは、平板状の接続部５４を介して接続されている。 The tank main body portion 53 includes a first tank main body portion 531 that forms a space in the tank of the upper tank portion 12 of the first evaporation portion 1 and a second space that forms a space in the tank of the upper tank portion 22 of the second evaporation portion 2. A tank main body 532. The first and second tank main body portions 531 and 532 are each formed in a semi-cylindrical shape having both ends opened, that is, having openings on both ends. Further, the first tank main body portion 531 and the second tank main body portion 532 are connected via a flat connection portion 54.

コアプレート５２とタンク本体部５３との間には、平板状の中間プレート５５が配設されており、タンク本体部５３と中間プレート５５との間にタンク内空間が構成されるようになっている。中間プレート５５には、第１貫通孔５１ａに対応した第３貫通孔５６ａ、および第２貫通孔５１ｂに対応した第４貫通孔５６ｂが形成されている。 A flat plate-like intermediate plate 55 is disposed between the core plate 52 and the tank main body 53, and a tank internal space is formed between the tank main body 53 and the intermediate plate 55. Yes. The intermediate plate 55 is formed with a third through hole 56a corresponding to the first through hole 51a and a fourth through hole 56b corresponding to the second through hole 51b.

第１タンク本体部５３１の両端部には、当該第１タンク本体部５３１の開口部を閉塞する盲キャップ５７がそれぞれ配設されている。第２タンク本体部５３２の一方の端部には、当該第２タンク本体部５３２の開口部を閉塞する盲キャップ５７が配設されている。また、第２タンク本体部５３２の他方の端部は、後述する冷媒流出口２９となっている。 At both ends of the first tank body 531, blind caps 57 that close the openings of the first tank body 531 are disposed. A blind cap 57 that closes the opening of the second tank body 532 is disposed at one end of the second tank body 532. Further, the other end of the second tank body 532 is a refrigerant outlet 29 described later.

なお、図示は省略しているが、本実施形態の下側タンク部１３、２３も、上側タンク部１２、２２と同様に形成されている。すなわち、下側タンク部１３、２３は、一体化されており、チューブ１４、２４の下端部が挿入接合される貫通孔が複数形成されたコアプレートと、タンク内空間を構成するタンク本体部と、コアプレートとタンク本体部との間に配設される中間プレートと、タンク本体部の開口部を閉塞する盲キャップとを備えて構成されている。 In addition, although illustration is abbreviate | omitted, the lower tank parts 13 and 23 of this embodiment are also formed similarly to the upper tank parts 12 and 22. That is, the lower tank portions 13 and 23 are integrated, a core plate in which a plurality of through holes into which the lower end portions of the tubes 14 and 24 are inserted and joined, and a tank main body portion that constitutes a tank internal space, The intermediate plate disposed between the core plate and the tank main body and a blind cap that closes the opening of the tank main body.

図２および図３に示すように、第１蒸発部１のチューブ１４の上下両端部が、タンク部１２、１３の内部空間に連通するようになっている。同様に、第２蒸発部２のチューブ２４の上下両端部が、タンク部２２、２３の内部空間に連通するようになっている。これにより、上下両側のタンク部１２、１３、２２、２３は、それぞれ対応するコア部１１、２１の複数のチューブ１４、２４へ冷媒流れを分配したり、複数のチューブ２４からの冷媒流れを集合する役割を果たす。 As shown in FIGS. 2 and 3, the upper and lower end portions of the tube 14 of the first evaporator 1 communicate with the internal spaces of the tank portions 12 and 13. Similarly, the upper and lower ends of the tube 24 of the second evaporation unit 2 communicate with the internal spaces of the tank units 22 and 23. Thereby, the tank parts 12, 13, 22, and 23 on both the upper and lower sides respectively distribute the refrigerant flow to the plurality of tubes 14 and 24 of the corresponding core parts 11 and 21, and collect the refrigerant flows from the plurality of tubes 24, respectively. To play a role.

第１蒸発部１の上側タンク部１２の内部空間、すなわち第１タンク本体部５３１と中間プレート５５との間には、上側タンク部１２の内部空間をチューブ積層方向に仕切る仕切部材１７が配置されている。これにより、第１蒸発部１のコア部１１は、チューブ積層方向に第１ターン部１１ａと第２ターン部１１ｂの２つに分割されている。第１ターン部１１ａは、第２ターン部１１ｂより冷媒流れ上流側に配置されている。本実施形態では、第１ターン部１１ａを構成するチューブ１４の本数は、第２ターン部１１ｂを構成するチューブ１４の本数より少なくなっている。 A partition member 17 that partitions the internal space of the upper tank portion 12 in the tube stacking direction is disposed between the internal space of the upper tank portion 12 of the first evaporator 1, that is, between the first tank main body portion 531 and the intermediate plate 55. ing. Thereby, the core part 11 of the 1st evaporation part 1 is divided | segmented into two, the 1st turn part 11a and the 2nd turn part 11b, in the tube lamination direction. The first turn part 11a is disposed upstream of the refrigerant flow from the second turn part 11b. In the present embodiment, the number of tubes 14 constituting the first turn part 11a is smaller than the number of tubes 14 constituting the second turn part 11b.

また、第２蒸発部２の上側タンク部２２の内部空間、すなわち第２タンク本体部５３２と中間プレート５５との間には、上側タンク部２２の内部空間をチューブ積層方向に仕切る仕切部材２７が配置されている。これにより、第２蒸発部２のコア部２１は、チューブ積層方向に第３ターン部２１ａと第４ターン部２１ｂの２つに分割されている。第３ターン部２１ａは、第４ターン部２１ｂより冷媒流れ上流側に配置されている。本実施形態では、第３ターン部２１ａを構成するチューブ２４の本数は、第４ターン部２１ｂを構成するチューブ２４の本数より少なくなっている。 In addition, a partition member 27 that partitions the internal space of the upper tank portion 22 in the tube stacking direction is provided between the internal space of the upper tank portion 22 of the second evaporator 2, that is, between the second tank main body portion 532 and the intermediate plate 55. Has been placed. Thereby, the core part 21 of the 2nd evaporation part 2 is divided | segmented into two, the 3rd turn part 21a and the 4th turn part 21b, in the tube lamination direction. The third turn part 21a is disposed upstream of the refrigerant flow from the fourth turn part 21b. In the present embodiment, the number of tubes 24 constituting the third turn portion 21a is smaller than the number of tubes 24 constituting the fourth turn portion 21b.

第１、第２蒸発部１、２の上方側には、第１、第２蒸発部１、２に膨張弁（図示せず）下流側の低圧冷媒を流入させる冷媒流入配管３が配設されている。冷媒流入配管３は、当該冷媒流入配管３の途中から分岐され第１蒸発部１の上側タンク部１２に至る第１分岐配管３ａと、当該冷媒流入配管３の途中から分岐され第２蒸発部２の上側タンク部２２に至る第２分岐配管３ｂとを有している。本実施形態では、第１分岐配管３ａは、第２分岐配管３ｂより冷媒流入配管３内の冷媒流れ上流側で冷媒流入配管３から分岐している。 On the upper side of the first and second evaporators 1 and 2, a refrigerant inflow pipe 3 is provided for allowing low-pressure refrigerant on the downstream side of the expansion valve (not shown) to flow into the first and second evaporators 1 and 2. ing. The refrigerant inflow pipe 3 branches from the middle of the refrigerant inflow pipe 3 and reaches the upper tank portion 12 of the first evaporator 1, and the second evaporating section 2 branches from the middle of the refrigerant inflow pipe 3. And a second branch pipe 3b that reaches the upper tank portion 22 of the first tank. In the present embodiment, the first branch pipe 3a branches from the refrigerant inflow pipe 3 on the upstream side of the refrigerant flow in the refrigerant inflow pipe 3 from the second branch pipe 3b.

第１蒸発部１の上側タンク部１２における第１ターン部１１ａと連通する部位（以下、第１上側タンク部１２ａという）には、第１分岐配管３ａに接続される第１冷媒流入口１８が設けられている。また、第２蒸発部２の上側タンク部２２における第３ターン部２１ａと連通する部位（以下、第３上側タンク部２２ａという）には、第２分岐配管３ｂに接続される第２冷媒流入口２８が設けられている。 A first refrigerant inlet 18 connected to the first branch pipe 3a is connected to a portion (hereinafter referred to as a first upper tank portion 12a) communicating with the first turn portion 11a in the upper tank portion 12 of the first evaporation portion 1. Is provided. A second refrigerant inlet connected to the second branch pipe 3b is connected to a portion (hereinafter referred to as a third upper tank portion 22a) communicating with the third turn portion 21a in the upper tank portion 22 of the second evaporation portion 2. 28 is provided.

第１蒸発部１の上側タンク部１２における第２ターン部１１ｂと連通する部位（以下、第２上側タンク部１２ｂという）と、第２蒸発部２の上側タンク部２２における第４ターン部２１ｂと連通する部位（以下、第４上側タンク部２２ｂという）とは、連結部４により接続されている。本実施形態では、図３に示すように、中間プレート５５におけるチューブ積層方向の中央部近傍において、第３貫通孔５６ａと第４貫通孔５６ｂとが一体化されて、空気流れ方向に対して平行に延びる矩形状の貫通孔（以下、第５貫通孔５６ｃという）が複数形成されており、これらの第５貫通孔５６ｃにより、連結部４が構成されている。 A portion (hereinafter referred to as a second upper tank portion 12b) communicating with the second turn portion 11b in the upper tank portion 12 of the first evaporation portion 1, and a fourth turn portion 21b in the upper tank portion 22 of the second evaporation portion 2; The connecting portion (hereinafter referred to as the fourth upper tank portion 22b) is connected by the connecting portion 4. In the present embodiment, as shown in FIG. 3, the third through hole 56 a and the fourth through hole 56 b are integrated in the vicinity of the center portion of the intermediate plate 55 in the tube stacking direction, and are parallel to the air flow direction. A plurality of rectangular through-holes (hereinafter referred to as fifth through-holes 56c) are formed, and the connecting portion 4 is configured by these fifth through-holes 56c.

図２に戻り、第４上側タンク部２２ｂには、第１、第２蒸発部１、２内の冷媒を圧縮機（図示せず）の吸引側に向けて流出させる冷媒流出口２９が設けられている。 Returning to FIG. 2, the fourth upper tank portion 22b is provided with a refrigerant outlet 29 through which the refrigerant in the first and second evaporators 1 and 2 flows out toward the suction side of the compressor (not shown). ing.

第１蒸発部１のコア部１１において、第１ターン部１１ａはチューブ積層方向、すなわちコア部１１、２１の左右方向の一側（図２中左側）に配置されており、第２ターン部１１ｂはチューブ積層方向の他側（図２中右側）に配置されている。また、第２蒸発部２のコア部２１において、第３ターン部２１ａはチューブ積層方向の他側に配置されており、第４ターン部２１ｂはチューブ積層方向の一側に配置されている。このため、第１ターン部１１ａと第４ターン部２１ｂとが空気流れ方向に直列に配置されているとともに、第２ターン部１１ｂと第３ターン部２１ａとが空気流れ方向に直列に配置されている。 In the core part 11 of the first evaporation part 1, the first turn part 11a is disposed on the tube stacking direction, that is, on one side of the left and right direction of the core parts 11 and 21 (left side in FIG. 2), and the second turn part 11b. Is arranged on the other side (right side in FIG. 2) in the tube stacking direction. Moreover, in the core part 21 of the 2nd evaporation part 2, the 3rd turn part 21a is arrange | positioned at the other side of the tube lamination direction, and the 4th turn part 21b is arrange | positioned at the one side of the tube lamination direction. For this reason, the first turn portion 11a and the fourth turn portion 21b are arranged in series in the air flow direction, and the second turn portion 11b and the third turn portion 21a are arranged in series in the air flow direction. Yes.

次に、本実施形態に係る冷媒蒸発器の冷媒の流れについて説明する。図２に示すように、冷媒流入配管３から第１冷媒流入口１８を介して第１上側タンク部１２ａの内部空間に流入した低圧冷媒は、第１ターン部１１ａを矢印ａのごとく下降して下側タンク部１３の内部空間に流入し、この内部空間を矢印ｂのごとく左側から右側へと流れる。 Next, the flow of the refrigerant in the refrigerant evaporator according to this embodiment will be described. As shown in FIG. 2, the low-pressure refrigerant that has flowed from the refrigerant inflow pipe 3 into the internal space of the first upper tank portion 12a through the first refrigerant inlet 18 descends the first turn portion 11a as indicated by the arrow a. It flows into the internal space of the lower tank part 13 and flows through the internal space from the left side to the right side as shown by the arrow b.

続いて、下側タンク部１３の内部空間の右側領域の冷媒が、第２ターン部１１ｂを矢印ｃのごとく上昇して第２上側タンク部１２ｂの内部空間に流入し、この内部空間を矢印ｄのごとく右側から左側へと流れる。 Subsequently, the refrigerant in the right region of the internal space of the lower tank portion 13 rises up the second turn portion 11b as indicated by the arrow c and flows into the internal space of the second upper tank portion 12b. It flows from the right side to the left side.

続いて、第２上側タンク部１２ｂの内部空間の冷媒が、連結部４を矢印ｅのごとく空気流れ上流側から下流側へと流れて第４上側タンク部２２ｂの内部空間に流入し、この内部空間を矢印ｆのごとく右側から左側へと流れる。そして、第４上側タンク部２２ｂの左端部の冷媒流出口２９から冷媒が矢印ｇのごとく流出して圧縮機（図示せず）の吸入側へ向かう。 Subsequently, the refrigerant in the internal space of the second upper tank portion 12b flows through the connecting portion 4 from the upstream side to the downstream side as indicated by arrow e and flows into the internal space of the fourth upper tank portion 22b. The space flows from the right side to the left side as indicated by the arrow f. And a refrigerant | coolant flows out from the refrigerant | coolant outflow port 29 of the left end part of the 4th upper side tank part 22b like the arrow g, and goes to the suction side of a compressor (not shown).

一方、冷媒流入配管３から第２冷媒流入口２８を介して第３上側タンク部２２ａの内部空間に流入した低圧冷媒は、第３ターン部２１ａを矢印ｈのごとく下降して下側タンク部２３の内部空間に流入し、この内部空間を矢印ｉのごとく右側から左側へと流れる。 On the other hand, the low-pressure refrigerant that has flowed from the refrigerant inflow pipe 3 into the internal space of the third upper tank portion 22a through the second refrigerant inlet 28 descends the third turn portion 21a as indicated by the arrow h, and the lower tank portion 23. And flows from the right side to the left side as indicated by the arrow i.

続いて、下側タンク部２３の内部空間の左側領域の冷媒が、第４ターン部２１ｂを矢印ｊのごとく上昇して第４上側タンク部２２ｂの内部空間に流入する。そして、第４上側タンク部２２ｂの左端部の冷媒流出口２９から冷媒が矢印ｇのごとく流出して圧縮機（図示せず）の吸入側へ向かう。 Subsequently, the refrigerant in the left region of the inner space of the lower tank portion 23 moves up the fourth turn portion 21b as indicated by an arrow j and flows into the inner space of the fourth upper tank portion 22b. And a refrigerant | coolant flows out from the refrigerant | coolant outflow port 29 of the left end part of the 4th upper side tank part 22b like the arrow g, and goes to the suction side of a compressor (not shown).

以上説明したように、本実施形態のような蒸発器によれば、冷媒流入配管３から各蒸発部１、２に流入した冷媒は、それぞれのコア部１１、２１で左右方向にＵターンした後、連結部４を介して合流するので、各コア部１１、２１におけるターン数を２つにする、すなわちターン数を少なくすることができる。これにより、冷媒の流通距離を短縮することができるので、冷媒流れの圧力損失を低減することができる。このとき、各蒸発部１、２において、コア部１１、２１の左右方向で冷媒をＵターンさせることができるので、良好な温度分布を得ることができる。したがって、良好な温度分布を得つつ、冷媒流れの圧力損失を低減することが可能となる。 As described above, according to the evaporator as in the present embodiment, the refrigerant that has flowed into the evaporation units 1 and 2 from the refrigerant inflow pipe 3 makes a U-turn in the left-right direction at the respective core units 11 and 21. Since the merging is performed via the connecting portion 4, the number of turns in each of the core portions 11 and 21 can be reduced to two, that is, the number of turns can be reduced. Thereby, since the circulation distance of a refrigerant | coolant can be shortened, the pressure loss of a refrigerant | coolant flow can be reduced. At this time, in each of the evaporation sections 1 and 2, the refrigerant can be U-turned in the left-right direction of the core sections 11 and 21, so that a favorable temperature distribution can be obtained. Therefore, it is possible to reduce the pressure loss of the refrigerant flow while obtaining a good temperature distribution.

ところで、第１ターン部１１ａをチューブ積層方向の一側（本実施形態では運転席側）に配置するとともに、第３ターン部２１ａをチューブ積層方向の他側（本実施形態では助手席側）に配置することで、図４に示すように、運転席側の負荷（すなわち空気流量）が大きく、助手席側の負荷が小さい場合において、冷媒流入配管３からの冷媒は、負荷の小さいチューブ積層方向の他側に配置された第２蒸発部２の第３ターン部２１ａにより多く流入し、負荷の大きいチューブ積層方向一側に配置された第１蒸発部１の第１ターン部１１ａに流入し難くなる。 By the way, the first turn portion 11a is arranged on one side of the tube stacking direction (driver seat side in this embodiment), and the third turn portion 21a is on the other side of the tube stacking direction (passenger seat side in this embodiment). As shown in FIG. 4, when the load on the driver's seat side (that is, the air flow rate) is large and the load on the passenger seat side is small, the refrigerant from the refrigerant inflow pipe 3 is placed in the tube stacking direction with a small load. A larger amount flows into the third turn portion 21a of the second evaporator 2 disposed on the other side, and it is difficult to flow into the first turn portion 11a of the first evaporator 1 disposed on the one side in the tube stacking direction with a large load. Become.

このとき、第１ターン部１１ａの空気流れ下流側には、第２蒸発部２の第４ターン部２１ｂが配置されている。第４ターン部２１ｂは、流入する冷媒量の多い第３ターン部２１ａと連通しているので、第４ターン部２１ｂを流れる冷媒量は多くなる。このため、負荷の多い運転席側に、冷媒流量の少ない第１ターン部１１ａと、冷媒流量の多い第４ターン部２１ｂとを配置することができる。したがって、負荷の大きい運転席側の領域にも、冷媒を多く流すことができるので、空気を冷却するために必要な冷媒量を確保することが可能となる。 At this time, the 4th turn part 21b of the 2nd evaporation part 2 is arranged in the air flow downstream of the 1st turn part 11a. Since the fourth turn part 21b communicates with the third turn part 21a having a large amount of refrigerant flowing in, the amount of refrigerant flowing through the fourth turn part 21b increases. For this reason, the 1st turn part 11a with small refrigerant | coolant flow volume and the 4th turn part 21b with large refrigerant | coolant flow volume can be arrange | positioned at the driver's seat side with much load. Accordingly, since a large amount of refrigerant can flow also in the region on the driver's seat side where the load is large, it is possible to ensure the amount of refrigerant necessary for cooling the air.

また、第１ターン部１１ａと第４ターン部２１ｂとを空気流れ方向に直列に配置することで、第１、第２蒸発部器１、２のコア部１１、２１のスーパーヒート領域（冷媒流れ下流側領域）同士、すなわち第２ターン部１１ｂと第４ターン部２１ｂとが重ならないようにすることができる。このため、第１、第２蒸発部１、２のスーパーヒート領域同士が重なることによる温度分布の悪化を回避することが可能となる。 Further, by arranging the first turn part 11a and the fourth turn part 21b in series in the air flow direction, the superheat region (refrigerant flow) of the core parts 11 and 21 of the first and second evaporators 1 and 2 is arranged. The downstream regions), that is, the second turn portion 11b and the fourth turn portion 21b can be prevented from overlapping each other. For this reason, it becomes possible to avoid the deterioration of the temperature distribution due to the superheat regions of the first and second evaporators 1 and 2 overlapping.

また、第１ターン部１１ａを流れる冷媒の流れ方向と、第４ターン部２１ｂを流れる冷媒の流れ方向とが対向流となるので、第１ターン部１１ａと第４ターン部２１ｂを空気流れ方向に直列に配置することで、空気流れ方向で温度分布の悪化領域を互いに打ち消し合うことができる。すなわち、コア部１１、２１のチューブ積層方向の一部で、比較的温度が高くなる部分同士、または比較的温度が低くなる部分同士が、空気流れ方向に関して、互いに重畳することを少なくできる。このため、温度分布を均一化することが可能となる。 In addition, since the flow direction of the refrigerant flowing through the first turn portion 11a and the flow direction of the refrigerant flowing through the fourth turn portion 21b are opposed to each other, the first turn portion 11a and the fourth turn portion 21b are directed in the air flow direction. By arranging in series, it is possible to cancel each other the regions where the temperature distribution deteriorates in the air flow direction. That is, it is possible to reduce the overlapping of the relatively high temperature portions or the relatively low temperature portions of the core portions 11 and 21 in the tube stacking direction with respect to the air flow direction. For this reason, it becomes possible to make temperature distribution uniform.

このとき、第１、第２冷媒流入口１８、２８の、冷媒流入配管３内の冷媒流れ方向における位置を調節することで、第１ターン部１１ａおよび第３ターン部２１ａにおける冷媒の流れ方を変えることができるため、空気流れ方向で温度分布の悪化領域をより確実に打ち消し合うようにできる。 At this time, by adjusting the positions of the first and second refrigerant inlets 18 and 28 in the refrigerant flow direction in the refrigerant inflow pipe 3, the refrigerant flows in the first turn part 11a and the third turn part 21a. Since it can be changed, it is possible to more reliably cancel out the deterioration regions of the temperature distribution in the air flow direction.

また、第１、第２冷媒流入口１８、２８に絞り等の抵抗手段を設けることで、各ターン部１１ａ、１１ｂ、２１ａ、２１ｂに流れる冷媒量を調節することができるため、空気流れ方向で温度分布の悪化領域をより確実に打ち消し合うようにできる。 In addition, by providing resistance means such as throttles at the first and second refrigerant inlets 18 and 28, the amount of refrigerant flowing through the turn portions 11a, 11b, 21a, and 21b can be adjusted. The region where the temperature distribution deteriorates can be canceled more reliably.

また、連結部４を中間プレート５５に設けた第５貫通孔５６ｃで構成することで、新たな冷媒通路を必要とすることなく、第１蒸発部１の上側タンク部１２と、第２蒸発部２の上側タンク部２２とを連結することができる。これにより、部品点数を低減することができるので、蒸発器の構成を簡素化することが可能となる。 Further, by configuring the connecting portion 4 with the fifth through hole 56c provided in the intermediate plate 55, the upper tank portion 12 of the first evaporation portion 1 and the second evaporation portion are not required without requiring a new refrigerant passage. The two upper tank portions 22 can be connected. Thereby, since the number of parts can be reduced, it becomes possible to simplify the structure of an evaporator.

また、第１ターン部１１ａを構成するチューブ１４の本数を、第２ターン部１１ｂを構成するチューブ１４の本数より少なくするとともに、第３ターン部２１ａを構成するチューブ２４の本数を、第４ターン部２１ｂを構成するチューブ２４の本数より少なくすることで、連結部４を空気流れ方向に対して略平行に延びるように構成することができる。これにより、連結部４を形成し易くすることが可能となる。 Further, the number of tubes 14 constituting the first turn part 11a is made smaller than the number of tubes 14 constituting the second turn part 11b, and the number of tubes 24 constituting the third turn part 21a is set to the fourth turn. By reducing the number of tubes 24 constituting the portion 21b, the connecting portion 4 can be configured to extend substantially parallel to the air flow direction. Thereby, it becomes possible to make it easy to form the connecting portion 4.

（他の実施形態）
なお、上記実施形態では、冷媒流入配管３を蒸発部１、２の上部に配置するとともに、冷媒流入配管３から冷媒を各蒸発部１、２の上側タンク部１２、２２に流入させるように構成した例について説明したが、これに限らず、冷媒流入配管３を蒸発器の下部に配置するとともに、冷媒流入配管３から冷媒を各蒸発部１、２の下側タンク部１３、２３に流入させるように構成してもよい。 (Other embodiments)
In the above embodiment, the refrigerant inflow pipe 3 is arranged above the evaporation units 1 and 2, and the refrigerant is allowed to flow from the refrigerant inflow pipe 3 into the upper tank portions 12 and 22 of the evaporation units 1 and 2. However, the present invention is not limited to this, and the refrigerant inflow pipe 3 is arranged in the lower part of the evaporator, and the refrigerant is allowed to flow from the refrigerant inflow pipe 3 into the lower tank parts 13 and 23 of the respective evaporation units 1 and 2. You may comprise as follows.

また、上記実施形態では、第１ターン部１１ａをチューブ積層方向の一側に配置するとともに、第３ターン部２１ａをチューブ積層方向の他側に配置した例について説明したが、これに限らず、第１ターン部１１ａおよび第３ターン部２１ａを共にチューブ積層方向一側に配置し、第２ターン部１１ｂおよび第４ターン部２２ｂを共にチューブ積層方向他側に配置してもよい。すなわち、第１ターン部１１ａと第３ターン部２１ａとを空気流れ方向に直列に配置してもよい。 Moreover, in the said embodiment, while arrange | positioning the 1st turn part 11a on the one side of the tube lamination direction, and demonstrated the example which has arrange | positioned the 3rd turn part 21a on the other side of the tube lamination direction, it is not restricted to this, Both the first turn part 11a and the third turn part 21a may be arranged on one side in the tube stacking direction, and the second turn part 11b and the fourth turn part 22b may be arranged on the other side in the tube stacking direction. That is, you may arrange | position the 1st turn part 11a and the 3rd turn part 21a in series in an air flow direction.

この場合、第１冷媒流入口１８を第１ターン部１１ａのチューブ積層方向一側に配置するとともに、第２冷媒流入口２８を第３ターン部２１ａのチューブ積層方向他側に配置してもよい。これによれば、第１ターン部１１ａに発生する冷媒が不足する領域と、第３ターン部２１ａに発生する冷媒が不足する領域とが、空気流れ方向に関して、互いに重畳することを抑制できる。このため、温度分布を均一化することが可能となる。 In this case, the first refrigerant inlet 18 may be disposed on one side of the first turn part 11a in the tube stacking direction, and the second refrigerant inlet 28 may be disposed on the other side of the third turn part 21a in the tube stacking direction. . According to this, it can suppress that the area | region where the refrigerant | coolant which generate | occur | produces in the 1st turn part 11a is insufficient, and the area | region where the refrigerant | coolant which generate | occur | produces in the 3rd turn part 21a is insufficient mutually overlap. For this reason, it becomes possible to make temperature distribution uniform.

本発明の実施形態に係る蒸発器の斜視図である。It is a perspective view of the evaporator concerning the embodiment of the present invention. 本発明の実施形態に係る蒸発器を模式的に示した説明図である。It is explanatory drawing which showed typically the evaporator which concerns on embodiment of this invention. 本発明の実施形態に係る蒸発器の上側タンク部１２、２２近傍を示す分解斜視図である。It is a disassembled perspective view which shows the upper tank parts 12 and 22 vicinity of the evaporator which concerns on embodiment of this invention. 本発明の実施形態に係る蒸発器内の冷媒流れを示した説明図である。It is explanatory drawing which showed the refrigerant | coolant flow in the evaporator which concerns on embodiment of this invention.

Explanation of symbols

１第１蒸発部
２第２蒸発部
３冷媒流入配管
４連結部
１１、２１コア部
１１ａ第１ターン部
１１ｂ第２ターン部
１２、２２上側タンク部
１７第１仕切部材
１８第１冷媒流入口
２１ａ第３ターン部
２１ｂ第４ターン部
２７第２仕切部材
２８第２冷媒流入口 DESCRIPTION OF SYMBOLS 1 1st evaporation part 2 2nd evaporation part 3 Refrigerant inflow piping 4 Connection part 11, 21 Core part 11a 1st turn part 11b 2nd turn part 12, 22 Upper tank part 17 1st partition member 18 1st refrigerant | coolant inflow port 21a 3rd turn part 21b 4th turn part 27 2nd partition member 28 2nd refrigerant | coolant inflow port

Claims

A refrigerant evaporator that exchanges heat between a cooled fluid flowing outside and a refrigerant,
A first evaporator (1) and a second evaporator (2) arranged in series in the flow direction of the fluid to be cooled;
The first evaporator (1) and the second evaporator (2) are respectively
A core portion (11, 21) configured by laminating a plurality of tubes (14, 24) constituting a refrigerant passage in a direction orthogonal to the flow direction of the fluid to be cooled;
A pair of tanks joined to both longitudinal ends of the plurality of tubes (14, 24) to distribute the refrigerant to the tubes (14, 24) or to collect the refrigerant from the tubes (14, 24). Part (12, 13, 22, 23),
Among the pair of tank parts (12, 13) of the first evaporation part (1), the tank part (12) is laminated with the tube (14) inside the one tank part (12). A first partition member (17) for partitioning in the direction is disposed, and the core portion (11) of the first evaporation portion (1) is arranged in a stacking direction of the tube (14) with a first turn portion (11a). When is divided only into two second turn portion (11b),
Among the pair of tank parts (22, 23) of the second evaporation part (2), one of the tank parts (22) is stacked with the tube (24) inside the one tank part (22). A second partition member (27) that partitions in the direction is disposed, and the core portion (21) of the second evaporation section (2) is connected to the third turn section (21a) in the stacking direction of the tubes (24). When is divided only two in the fourth turn portion (21b),
The first turn part (11a) is disposed upstream of the refrigerant flow from the second turn part (11b),
The third turn part (21a) is arranged upstream of the refrigerant flow from the fourth turn part (21b),
The first turn part (11a) includes a first refrigerant inlet (18) connected to a refrigerant inflow pipe (3) through which the refrigerant flows into the first evaporation part (1) and the second evaporation part (2). )
The third turn part (21a) has a second refrigerant inlet (28) connected to the refrigerant inflow pipe (3),
And the refrigerant flow downstream of the end of the second turn portion (11b), an end portion of said refrigerant flow downstream side of the fourth turn portion (21b), are connected by a connecting portion (4) ,
The first turn part (11a) is disposed on one side in the stacking direction of the tube (14) in the core part (11) of the first evaporation part (1), and the second turn part ( 11b) is arranged on the other side in the stacking direction of the tube (14) in the core part (11) of the first evaporation part (1),
The third turn part (21a) is disposed on the other side in the stacking direction of the tube (24) in the core part (21) of the second evaporation part (2), and the fourth turn part ( 21b) is arranged on one side in the stacking direction of the tube (24) in the core part (21) of the second evaporation part (2),
The first turn part (11a) and the fourth turn part (21b) are arranged in series in the flow direction of the fluid to be cooled, and the second turn part (11b) and the third turn part ( 21a) is arranged in series in the flow direction of the fluid to be cooled,
The refrigerant inflow pipe (3), the connecting portion (4), and the first and second partition members (17, 27) are either the same end of the longitudinal ends of the tube (14). It is arranged on the part side,
Further, the connecting portion (4) is disposed at the center portion of the tube (24) in the stacking direction, and the inside of the one tank portion (12) of the first evaporation portion (1) and the second evaporation portion ( The refrigerant evaporator is characterized in that it communicates with the inside of the one tank part (22) of 2) .