Evaporator

Abstract

[Problem] The purpose of the present invention is to suppress deviation in flow of a fluid in a plate-stacked evaporator having a crank-shaped introduction passage. [Solution] An evaporator 100 is formed by stacking plates 1 in a first direction, and is provided with: a plurality of first flow paths 2 that communicate with each other on one end side in a second direction substantially orthogonal to the first direction, and guide a first fluid 9 in the second direction; and a first fluid introduction path 7 that guides the first fluid 9 to the one end side of the plurality of first flow paths 2. The first fluid introduction path 7 is provided with an introduction path inlet 7a, a bent part 7c that guides the first fluid 9 from the introduction path inlet 7a in a third direction substantially opposite to the second direction, an introduction path outlet 7b that faces the one end side of a first flow path 2 closest to the first fluid introduction path 7 among the plurality of first flow paths 2, has a cross-sectional area smaller than that of the introduction path inlet 7a, and guides the first fluid 9 from the bent part 7c in the first direction, and a wall part 7d protruding toward the first flow path 2 side from a part of an edge part of the introduction path outlet 7b that faces a flow of the first fluid 9 in the third direction.

Description

Evaporator

[0001] The present invention relates to an evaporator.

[0002] Plate stacked type evaporators are known. For example, the evaporator disclosed in Patent Document 1 has a first flow path and a second flow path alternately formed by a plurality of stacked plates. By circulating a first fluid in a gas-liquid two-phase state through the first flow path and a second fluid through the second flow path, the second fluid is cooled. The first fluid is introduced into the first flow path from a first fluid introduction path. The first fluid introduction path has an introduction path inlet, an introduction path outlet, and a bent portion provided between the introduction path inlet and the introduction path outlet, and is formed in a crank shape as a whole.

[0003] International Publication No. 2023 / 101028

[0004] Patent Document 1 describes that, as a problem of a conventional plate stacked type evaporator, when the first fluid flows from the first fluid introduction path into the first flow path, the first fluid drifts to the outside of the core due to centrifugal force, so that most of the first fluid drifts to the lower stage direction of the core due to inertia and the heat exchange efficiency decreases. In Patent Document 1, as a configuration for suppressing the drift of the first fluid, it is proposed to provide a throttle hole at the introduction path outlet and appropriately set the flow rate of the first fluid and the flow path cross-sectional area of the throttle hole, but further suppression of drift is desired.

[0005] In consideration of the above circumstances, an object of the present invention is to suppress the drift of fluid in a plate stacked type evaporator having a crank-shaped introduction path.

[0006] To solve the above problems, the evaporator 100 according to the present invention is formed by stacking plates 1 in a first direction, and comprises a plurality of first flow paths 2 that guide a first fluid 9 in a second direction substantially perpendicular to the first direction, with one end of each flow path communicating with each other, and a first fluid introduction passage 7 that guides the first fluid 9 to the one end of each of the plurality of first flow paths 2, wherein the first fluid introduction passage 7 comprises an introduction passage inlet 7a, a bend 7c that guides the first fluid 9 from the introduction passage inlet 7a in a third direction substantially opposite to the second direction, an introduction passage outlet 7b that faces the one end of the first flow path 2 that is closest to the first fluid introduction passage 7 among the plurality of first flow paths 2, has a smaller cross-sectional area than the introduction passage inlet 7a, and guides the first fluid 9 from the bend 7c in the first direction, and a wall portion 7d that protrudes toward the first flow path 2 from the edge of the introduction passage outlet 7b, with the portion facing the flow of the first fluid 9 in the third direction.

[0007] The tip of the wall portion 7d may reach at least the first flow path 2 that is closest to the inlet outlet 7b.

[0008] The ratio of the cross-sectional area of ​​the inlet 7b to the cross-sectional area of ​​the inlet 7a may be 0.14 or more and 0.67 or less.

[0009] The evaporator 100 comprises a connecting body 8 on which the first fluid introduction passage 7 is formed, and an end plate 4 provided between the first flow path 2 closest to the connecting body 8 and the connecting body 8. The end plate 4 has a first inlet 4a facing the introduction passage outlet 7b, and the connecting body 8 has a projection 7e protruding toward the first flow path 2 at a portion of the edge of the introduction passage outlet 7b where the wall portion 7d is not provided, and the connecting body 8 may be fixed to the end plate 4 by crimping the projection 7e to the first inlet 4a.

[0010] According to the present invention, fluid flow deviation in a plate stacking type evaporator having a crank-shaped inlet can be suppressed.

[0011] This is a perspective view showing an evaporator according to one embodiment of the present invention. This is a perspective view showing a plate an end plate and connector according to one embodiment of the present invention. This is a perspective view showing an inlet and outlet according to one embodiment of the present invention. This is a bottom view showing a connector according to one embodiment of the present invention. This is a graph showing the relationship between the cross-sectional area of ​​the inlet and outlet of the inlet and outlet and the amount of heat dissipated according to one embodiment of the present invention. This is a cross-sectional view showing the I-I section of Figure 1. This is a cross-sectional view showing the II-II section of Figure 1. This is a schematic diagram showing a conventional evaporator. This is a schematic diagram showing an evaporator according to one embodiment of the present invention. This is a perspective view showing an end plate and connector according to a modified example of one embodiment of the present invention. This is a perspective view showing an inlet and outlet according to a modified example of one embodiment of the present invention. This is a bottom view showing a connector according to a modified example of one embodiment of the present invention.

[0012] A plate stacking type evaporator 100 according to one embodiment of the present invention will be described below with reference to the drawings.

[0013] In each diagram, U, Lo, L, R, Fr, and Rr indicate up, down, left, right, front, and back, respectively. These directions are defined solely for the sake of explanation.

[0014] [Core] The core 6 (see Figure 1) is constructed by stacking multiple plates 1 in a first direction (from top to bottom). The plates 1 are made of aluminum alloy, stainless steel, etc. Figure 3 is a diagram showing the plates 1 shown in Figure 2 arranged in reverse front to back and left to right. The core 6 is made by stacking multiple plates 1 alternately in reverse front to back and left to right. In Figures 1, 8, and 9, for illustrative purposes, an example is shown in which the core 6 is formed by eight plates 1, but the number of plates 1 in the present invention is not limited to eight. Also, in Figures 1, 8, and 9, the top plate 1 is arranged in the orientation of Figure 2, but the top plate 1 may be arranged in the orientation of Figure 3.

[0015] The configuration of plate 1 will be described below with reference to Figure 2. Plate 1 comprises a bottom portion 21, side wall portions 22, a first opening 23, a second opening 24, and a plurality of protrusions 25. The bottom portion 21 is a rectangular plate-like portion with the left-right direction as its longitudinal direction. The side wall portions 22 are provided above the bottom portion 21, with the four sides of the bottom portion 21 as base ends, and are inclined so that the upper end (tip) is located outward from the lower end (base end).

[0016] First openings 23 are provided on the left front and right front of the bottom portion 21. The first openings 23 are formed in the shape of an oval (a shape formed by connecting two semicircles with two straight lines) with the front-to-back direction as the longitudinal direction, and penetrate vertically. The left rear and right rear of the bottom portion 21 are provided with upwardly bulging portions 24a. The bulging portions 24a include a top portion 24b, an inclined portion 24c, and a second opening 24. The top portion 24b is formed in the shape of an oval parallel to the bottom portion 21. The inclined portion 24c is provided between the edge of the top portion 24b and the bottom portion 21, and is tapered overall from the bottom portion 21 side to the top portion 24b side. The second opening 24 is formed in the shape of an oval the same size as the first opening 23 with the front-to-back direction as its longitudinal direction, and penetrates vertically.

[0017] Multiple protrusions 25 are provided between the left and right first openings 23. The multiple protrusions 25 project upward from the bottom 21 and are formed linearly with their longitudinal direction inclined with respect to the left-right and front-back directions. Multiple protrusions 26 are provided between the left and right second openings 24. The multiple protrusions 26 project upward from the bottom 21 and are formed linearly with their longitudinal direction in the opposite direction to that of the protrusions 25. The plate 1 is press-formed, and as shown in Figures 8 and 9, when viewed from the underside of the bottom 21, the bulge 24a and the protrusions 25 and 26 are recessed upward. Note that the protrusions 25 and 26 may be formed in shapes other than linear, such as dots arranged in a grid or sinusoidal shapes.

[0018] As described above, the core 6 is constructed by stacking multiple plates 1 alternately with their front-to-back and left-to-right orientations reversed. Therefore, in two adjacent plates 1, the first opening 23 and the second opening 24 face each other in the vertical direction (see Figures 8 and 9). The first opening 23 is formed in the bottom 21, and the second opening 24 is formed in the top 24b of the bulge 24a. Therefore, the lower surface of the bottom 21 around the first opening 23 is in contact with the upper surface of the top 24b below it. On the other hand, a gap is formed between the upper surface of the bottom 21 around the first opening 23 and the lower surface of the bulge 24a above it. In the front of the core 6, this gap forms the first flow path 2, and in the rear of the core 6, this gap forms the second flow path 3.

[0019] In the front part of the core 6 (see Figure 8), first flow channels 2 are formed between the second and third plates 1 from the top, between the fourth and fifth plates 1 from the top, and between the sixth and seventh plates 1 from the top. The first flow channels 2 guide the first fluid 9 in a second direction. The second direction is substantially perpendicular to the first direction, and in this embodiment, it is the direction from left to right. One end of the multiple first flow channels 2 in the second direction (the left end in this embodiment) is in communication with each other, and the other end of the multiple first flow channels 2 in the second direction (the right end in this embodiment) is in communication with each other. Note that "substantially perpendicular" means that they are perpendicular in terms of design, but do not need to be strictly perpendicular geometrically. It refers to a state in which they intersect within a predetermined range. The predetermined range is, for example, the range defined by tolerances.

[0020] At the rear of the core 6 (see Figure 9), second flow channels 3 are formed between the first and second plates 1 from the top, between the third and fourth plates 1 from the top, between the fifth and sixth plates 1 from the top, and between the seventh and eighth plates 1 from the top. In other words, the multiple second flow channels 3 are arranged alternately with the multiple first flow channels 2 in the vertical direction. The second flow channels 3 guide the second fluid 10 in the opposite direction to the second direction. One end of the multiple second flow channels 3 in the second direction (the left end in this embodiment) is in communication with each other, and the other end of the multiple second flow channels 3 in the second direction (the right end in this embodiment) is in communication with each other.

[0021] [End Plates] End plate 4 is provided above the uppermost plate 1, and end plate 5 is provided below the lowermost plate 1 (see Figures 8 and 9). End plates 4 and 5 are made of aluminum alloy, stainless steel, etc. The lower surface of end plate 4 is in contact with the top 24b and protrusions 25 and 26 of the uppermost plate 1. End plate 4 includes a first inlet 4a, a first outlet 4b, a second inlet 4c, and a second outlet 4d. The first inlet 4a faces the first opening 23 and the second opening 24 on the left front of the plurality of plates 1. The first outlet 4b faces the first opening 23 and the second opening 24 on the right front of the plurality of plates 1. The second inlet 4c faces the first opening 23 and the second opening 24 on the right rear of the plurality of plates 1. The second outlet 4d faces the first opening 23 and the second opening 24 on the left rear of the plurality of plates 1. The upper surface of the end plate 5 is in contact with the lower surface of the bottom 21 of the lowest plate 1.

[0022] [Connecting body] The connecting body 8 is provided on the upper surface of the end plate 4. The connecting body 8 is formed in a block shape with the left-right direction as its longitudinal direction, and a first fluid introduction passage 7 and a first fluid outlet passage 11 are formed inside it. The connecting body 8 is made of aluminum alloy, stainless steel, or the like.

[0023] [First Fluid Inlet] The first fluid inlet 7 (see Figures 1, 6, and 8) comprises an inlet inlet 7a, an inlet outlet 7b, a bend 7c, and a wall 7d. The inlet inlet 7a (see Figure 8) is located slightly to the left of the center in the left-right direction of the connector 8. The refrigerant (first fluid 9), which has been converted into a gas-liquid two-phase state by an expansion valve (not shown), is supplied to the inlet inlet 7a. The inlet inlet 7a guides the first fluid 9 in a first direction (from top to bottom). In this embodiment, the cross-sectional shape of the inlet inlet 7a, when viewed from above or below, is circular, but it may also be elliptical, polygonal, or the like.

[0024] The inlet outlet 7b is located to the left of the inlet inlet 7a. The bent section 7c connects the inlet inlet 7a and the inlet outlet 7b, guiding the first fluid 9 in a third direction. The third direction is approximately the opposite of the second direction, and in this embodiment, it is the direction from right to left. The bent section 7c comprises side wall sections 7c1 and 7c2 (see Figure 6) facing each other in the front-rear direction, a ceiling section 7c3 connecting the upper ends of the left and right side wall sections 7c1 and 7c2, and an end section 7c4 which is the end on the inlet outlet 7b side. The bent section 7c is formed in a groove shape at the bottom of the connector 8 and is closed from below by the end plate 4 (see Figure 8). The width D2 of the bent section 7c on the inlet outlet 7b side is narrower than the width D1 of the bent section 7c on the inlet inlet 7a side (see Figure 6). The cross-sectional shape of the end section 7c4 viewed from below is a semicircle to the left of the center C of the circle. The cross-sectional shape of the end portion 7c4 may be part of an ellipse, part of a polygon, etc. "Approximately opposite direction" means that while the design is parallel, it does not need to be geometrically strictly parallel and may include errors within a predetermined range. The predetermined range is, for example, the range defined by tolerances.

[0025] The inlet outlet 7b (the shaded area in Figure 6) faces one end of the first flow path 2 that is closest to the first fluid inlet 7 among the multiple first flow paths 2 (in this embodiment, the left end), and guides the first fluid 9 from the bend 7c in the first direction (see Figure 8). Specifically, the inlet outlet 7b faces the first opening 23 on the left front of the uppermost plate 1, and the first fluid 9 flows into the multiple first flow paths 2. The inlet outlet 7b is a space enclosed by the end portion 7c4 of the bend 7c, the left and right side walls 7c1 and 7c2 of the bend 7c, and the first inlet 4a of the end plate 4. The cross-sectional area of ​​the inlet outlet 7b is smaller than the cross-sectional area of ​​the inlet 7a.

[0026] [Wall Section] The wall section 7d (see Figures 6 and 8) protrudes from the edge of the inlet / outlet 7b, specifically from the portion facing the flow of the first fluid 9 in the third direction, towards the first flow path 2. Here, the portion facing the flow of the first fluid 9 in the third direction (hereinafter referred to as the "facing portion") corresponds to the end portion 7c4 of the bent portion 7c, and is the semicircular portion shown in Figure 6. The wall section 7d protrudes downward from the facing portion. Figure 6 shows the center C of the arc of the semicircular facing portion. Viewed from below, the wall section 7d is formed symmetrically with respect to a straight line parallel to the third direction passing through the center C as the axis of symmetry.

[0027] The opening angle θ is the angle between a straight line parallel to the third direction passing through the center C and a straight line connecting the center C and the front end (or rear end) of the inner surface of the wall portion 7d. It is desirable that the opening angle θ be between 45° and 90°. If the opening angle θ is less than 45°, the flow deflection suppression effect is poor, and if the opening angle θ exceeds 90°, the outflow of the first fluid is hindered. Note that the range of the opening angle θ between 45° and 90° corresponds to a range of one-quarter to one-half of the entire circumference of the inlet outlet 7b when the inlet outlet 7b is circular.

[0028] The tip (lower end) of the wall portion 7d reaches at least the first flow path 2 that is closest to the inlet outlet 7b (in this embodiment, the uppermost stage). In this case, it is desirable that the tip of the wall portion 7d reaches near the center in the vertical direction of the first flow path 2. This is because the deeper the position of the tip of the wall portion 7d, the greater the flow deviation suppression effect, but the higher the processing cost. The tip of the wall portion 7d may also reach the first flow path 2 of the second stage or lower from the top.

[0029] [First Fluid Outlet] The first fluid outlet 11 is located opposite the other end (in this embodiment, the right end) of the first flow path 2 that is closest to the first fluid inlet 7 among the multiple first flow paths 2. Specifically, the first fluid outlet 11 is located opposite the first opening 23 at the front right of the uppermost plate 1 and guides the first fluid 9 that has flowed out from the multiple first flow paths 2 in a fourth direction opposite to the first direction (a direction from bottom to top).

[0030] [Second fluid introduction passage] The second fluid introduction passage 12 (see Figures 1, 4, and 9) is provided on the upper surface of the end plate 4 and faces the second opening 24 at the right rear of the uppermost plate 1, guiding the second fluid 10 in the first direction. The second fluid 10 flows into a plurality of second flow paths 3.

[0031] [Second fluid outlet passage] The second fluid outlet passage 13 is provided on the upper surface of the end plate 4 and faces the second opening 24 at the left rear of the uppermost plate 1, guiding the second fluid 10 that has flowed out from the plurality of second flow paths 3 in the fourth direction.

[0032] [Operation of the evaporator] The evaporator 100 is used, for example, to cool a secondary battery. A heat sink is in contact with the cells of the secondary battery, and the second fluid 10 flows through the heat sink (not shown). The heat generated from the cells is absorbed by the second fluid 10 through the heat sink. The second fluid 10 returns to the heat sink via the second fluid inlet passage 12, the second flow path 3, and the second fluid outlet passage 13.

[0033] The evaporator 100 is connected to a condenser and an expansion valve (not shown). A liquid-phase first fluid 9 is supplied from the condenser to the expansion valve, and the first fluid 9, which has been converted into a gas-liquid two-phase system by the expansion valve, returns to the condenser via the first fluid inlet passage 7, the first flow path 2, and the first fluid outlet passage 11. In the evaporator 100, the gas-liquid two-phase first fluid 9 flowing through the first flow path 2 absorbs heat from the second fluid 10 flowing through the second flow path 3. As a result, the liquid-phase first fluid 9 evaporates, and the second fluid 10 is cooled. Subsequently, the second fluid 10 returns to the heat sink and absorbs heat from the heat sink. Meanwhile, the first fluid 9 returns to the condenser and is liquefied by the condenser.

[0034] Here, we will explain the flow of the first fluid 9 from the first fluid introduction passage 7 to the first flow path 2. Figure 10 is a schematic diagram of a conventional evaporator 200. Figure 11 is a schematic diagram of the evaporator 100 according to this embodiment. When the first fluid 9 flows from the bend 7c through the introduction passage outlet 7b into the first flow path 2, the flow of the first fluid 9 changes from the third direction to the first direction, so a centrifugal force acts on the first fluid 9 that deflects it to the outside of the core 6. In the conventional configuration without a wall portion 7d (see Figure 10), much of the first fluid 9 that has deflected to the outside of the core 6 is deflected downwards by inertia, and more of the first fluid 9 flows in the lower first flow path 2. As a result, the heat exchange capacity in the lower first flow path 2 is insufficient, and conversely, there is an excess of heat exchange capacity in the upper first flow path 2, and the overall heat exchange efficiency decreases. In contrast, according to this embodiment, the wall portion 7d resists centrifugal force and suppresses the uneven flow of the first fluid 9 to the outside of the core 6. Therefore, compared to the case without the wall portion 7d, the first fluid 9 flows evenly into the multiple first flow channels 2, improving the heat exchange efficiency.

[0035] Next, the cross-sectional areas of the inlet 7a and outlet 7b of the introduction path will be explained. Figure 7 is a graph showing the relationship between the cross-sectional areas of the inlet 7a and outlet 7b of the introduction path and the amount of heat dissipated. The horizontal axis shows the ratio of the cross-sectional area of ​​the outlet 7b to the cross-sectional area of ​​the inlet 7a (hereinafter referred to as the cross-sectional area ratio). The vertical axis shows the ratio of the amount of heat dissipated by the evaporator 100 according to this embodiment (hereinafter referred to as the heat dissipation ratio) when the amount of heat dissipated by the conventional evaporator 100 (see Figure 10) is set to 100 (A in Figure 7). The heat dissipation ratio shows its maximum value (C in Figure 7) when the cross-sectional area ratio is about 0.3. B in Figure 7 is the average value of A and C. In other words, the maximum effect of the evaporator 100 according to this embodiment compared to the conventional evaporator 200 is expressed as (C - A), and B shows 50% of the maximum effect. A cross-sectional area ratio of 0.14 to 0.67 is preferable because it provides more than 50% of the maximum effect. Furthermore, a cross-sectional area ratio of 0.2 to 0.4 is preferable because it provides more than 90% of the maximum effect.

[0036] According to the evaporator 100 of this embodiment described above, it is formed by stacking plates 1 in a first direction, and has a plurality of first flow paths 2 that guide a first fluid 9 in a second direction substantially perpendicular to the first direction, with one end of each flow path communicating with each other. It also has a first fluid introduction passage 7 that guides the first fluid 9 to one end of the plurality of first flow paths 2. The first fluid introduction passage 7 has an introduction passage inlet 7a, a bend 7c that guides the first fluid 9 from the introduction passage inlet 7a in a third direction which is substantially opposite to the second direction, an introduction passage outlet 7b that faces the end of the first flow path 2 that is closest to the first fluid introduction passage 7, has a smaller cross-sectional area than the introduction passage inlet 7a, and guides the first fluid 9 from the bend 7c in the first direction, and a wall portion 7d that protrudes toward the first flow path 2 from the edge of the introduction passage outlet 7b, with the portion facing the flow of the first fluid 9 in the third direction. This configuration makes it possible to suppress the uneven flow of the first fluid 9 in a plate stacked type evaporator 100 having a crank-shaped first fluid introduction passage 7.

[0037] Furthermore, according to the evaporator 100 of this embodiment, the tip of the wall portion 7d reaches at least the first flow path 2 that is closest to the inlet outlet 7b. This configuration enhances the effect of suppressing the uneven flow of the first fluid 9.

[0038] Furthermore, according to the evaporator 100 of this embodiment, the ratio of the cross-sectional area of ​​the inlet outlet 7b to the cross-sectional area of ​​the inlet 7a is 0.14 or more and 0.67 or less. With this configuration, the outward velocity component of the core 6 due to centrifugal force is suppressed, thereby enhancing the effect of suppressing the uneven flow of the first fluid 9.

[0039] The above embodiment may be modified as follows.

[0040] A modified example of the above embodiment will now be described. Figure 12 is a perspective view showing the end plate 4 and the connecting body 8. Figure 13 is a perspective view showing the inlet / outlet 7b. Figure 14 is a bottom view showing the connecting body 8. The evaporator 100 according to this modified example comprises a connecting body 8 on which a first fluid inlet 7 is formed, and an end plate 4 provided between the first flow path 2 closest to the connecting body 8 and the connecting body 8. The end plate 4 has a first inlet 4a facing the inlet / outlet 7b, and the connecting body 8 has a projection 7e protruding toward the first flow path 2 at a point on the edge of the inlet / outlet 7b where a wall portion 7d is not provided, and the connecting body 8 is fixed to the end plate 4 by crimping the projection 7e to the first inlet 4a.

[0041] Specifically, the projection 7e protrudes from the lower surface of the connector 8. The projection 7e is provided to the right of the wall portion 7d, inside the first inlet 4a of the end plate 4, and at two locations on the front and rear ends of the wall portion 7d. The connector 8 is made of a metal such as aluminum alloy or stainless steel, and the projection 7e is made thinner than the wall portion 7d and can be plastically deformed in the front-rear direction. The tip of the projection 7e protrudes below the lower surface of the end plate 4. The connector 8 is fixed to the end plate 4 by crimping the tip of the projection 7e to the outside of the first inlet 4a using a tool. With this configuration, the connector 8 can be easily and firmly fixed to the end plate 4. In addition, since the wall portion 7d can be accurately positioned, the effect of suppressing the flow deviation of the first fluid 9 can be enhanced. In this modified example, an example in which the projection 7e is provided at two locations is shown, but the projection 7e may be provided at three or more locations.

[0042] In the above embodiment, an example was shown in which the number of plates 1 constituting the core 6 is eight. However, when the number of plates 1 constituting the core 6 is 15 or more, the flow deflection suppression effect by the wall portion 7d becomes significant. Therefore, the present invention is suitable when the number of plates 1 constituting the core 6 is 15 or more.

[0043] 1 Plate 2 First channel 4 End plate 4a First inlet 7 First fluid introduction channel 7a Inlet channel inlet 7b Inlet channel outlet 7c Bend 7d Wall 7e Protrusion 8 Connector 9 First fluid 100 Evaporator

Claims

1. A plurality of first flow channels (2) formed by stacking plates (1) in a first direction, with one end of each flow channel (2) in a second direction substantially perpendicular to the first direction communicating with each other, and guiding a first fluid (9) in the second direction; and a first fluid introduction channel (7) that guides the first fluid (9) to the end of each of the plurality of first flow channels (2), wherein the first fluid introduction channel (7) includes an introduction channel inlet (7a), a bend (7c) that guides the first fluid (9) from the introduction channel inlet (7a) in a third direction substantially opposite to the second direction, and an introduction channel outlet (7b) that faces the end of the first flow channel (2) that is closest to the first fluid introduction channel (7) among the plurality of first flow channels (2), has a smaller cross-sectional area than the introduction channel inlet (7a), and guides the first fluid (9) from the bend (7c) in the first direction. The evaporator (100) is characterized by comprising a wall portion (7d) that protrudes toward the first flow path (2) from the edge of the inlet outlet (7b) of the inlet passage, from the portion facing the flow of the first fluid (9) in the third direction.

2. The evaporator (100) according to claim 1, characterized in that the tip of the wall portion (7d) reaches at least the first flow path (2) that is closest to the inlet outlet (7b).

3. The evaporator (100) according to claim 1 or 2, characterized in that the ratio of the cross-sectional area of ​​the inlet (7b) to the cross-sectional area of ​​the inlet (7a) is 0.14 or more and 0.67 or less.

4. The evaporator (100) according to claim 1 or 2, comprising: a connecting body (8) on which the first fluid introduction passage (7) is formed; and an end plate (4) provided between the first flow path (2) closest to the connecting body (8) and the connecting body (8), wherein the end plate (4) is provided with a first inlet (4a) facing the introduction passage outlet (7b); the connecting body (8) is provided with a projection (7e) protruding toward the first flow path (2) at a portion of the edge of the introduction passage outlet (7b) where the wall portion (7d) is not provided; and the connecting body (8) is fixed to the end plate (4) by crimping the projection (7e) to the first inlet (4a).

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