JPH10332224A - Lamination type evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamination type evaporator, having a structure permitting more compacting and higher performance compared with a conventional evaporator. SOLUTION: A belt plate type tube element 1 is provided with a plurality of flat refrigerant passages 10 in the element 1 in the widthwise direction of the same so that refrigerant forms counter flow against air. Further, a corrugated inner fin 11 is arranged in the refrigerant passage 10 of the tube element 1. Short cylindrical tank units 12a, 12b, communicating the tube elements 1, 1 mutually in the internal part thereof, are formed at the terminals of mutually neighboring formed plates 7, 7 of the neighboring tube elements 1, 1 while inside and outside of the tip ends of short cylindrical tank units 12a, 12b are combined and connected so that the peripheral wall units of tip ends of them are engaged mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laminated evaporator made of metal such as aluminum, which is used as an evaporator for a car air conditioner.

[0002]

2. Description of the Related Art For example, as an evaporator for a car air conditioner, a plurality of strip-shaped tube elements formed by making a pair of plate-shaped forming plates face each other are provided with outer fins interposed therebetween. A stacked evaporator configured to be stacked in the thickness direction is provided. For the stacked evaporator, downsizing and high performance have been promoted, but the demand for downsizing and high performance has not been stopped.
There is a demand for higher performance.

[0003] Under such a background, an object of the present invention is to provide a laminated evaporator having a structure capable of realizing further compactness and higher performance.

[0004]

The object of the present invention is to provide a plurality of strip-shaped tube elements formed by opposing and matching a pair of dish-shaped forming plates, and these strip-shaped tube elements have outer fins between them. In the laminated evaporator interposed and laminated in the thickness direction, the strip-shaped tube element has a plurality of flat refrigerant passages in the width direction inside thereof, and the refrigerant flows through the evaporator in the front-rear direction. In order to form a counterflow with the air, it is made to flow sequentially from the leeward side refrigerant passage to the leeward side refrigerant passage, and in the refrigerant passage of the strip-shaped tube element, there is a dish-shaped plate. Inner fins of separate parts are arranged, and tube elements are internally communicated with ends of adjacent plate-shaped forming plates of adjacent strip-shaped tube elements. A laminated cylindrical evaporator characterized in that a short cylindrical tank portion having a protruding shape is formed, and the short cylindrical tank portions are joined by combining at least the distal end peripheral walls thereof in an inside / outside fitting state. Will be resolved.

[0005] That is, in the above-mentioned laminated evaporator, an outer protruding short cylindrical shape for internally communicating the tube elements is provided at the end of the adjacent plate-shaped forming plate of the adjacent strip-shaped tube element. A tank portion is formed, and the short cylindrical tank portions are joined by combining at least the distal end peripheral wall portions thereof in an inside-out fitting state, so that the inward-facing flange surfaces abut each other to form the tank portions. As compared with the case where the fluid is connected, the tank portion is made compact, whereby the core area effective for heat exchange between the refrigerant and the air is increased, and the pressure loss on the air side is also reduced. In addition, the flow of the refrigerant flowing in the tank portion becomes smooth, the resistance of the refrigerant passage is reduced, and high performance is realized. With such high performance, the overall size is also reduced.

Further, the strip-shaped tube element has a plurality of flat refrigerant passages in the width direction inside thereof, and the refrigerant is
In order to form a counterflow with the air flowing in the evaporator in the front-rear direction, the refrigerant is sequentially circulated from the leeward refrigerant passage to the leeward refrigerant passage, as compared with the case of the cross flow. The heat exchange efficiency is improved, and the performance is further improved.

Further, by disposing the inner fin, which is a separate component from the dish-shaped plate, in the coolant passage of the strip-shaped tube element, the heat transfer area of the refrigerant in the coolant passage is reduced by the dish-shaped plate. Compared with the case where the heat transfer area in the refrigerant passage is ensured by performing press forming on the coolant passage, it is ensured that the heat transfer area is much wider, and further higher performance is realized.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

In the laminated evaporator made of aluminum shown in FIG. 1, (1) is a strip-shaped tube element, (2) is an outer fin such as a corrugated fin, and the strip-shaped tube element (1). ) Are stacked in the thickness direction (the left-right direction in FIG. 1A) with an outer fin (2) interposed therebetween. A side plate (3) for protecting the outermost outer fins (2) is arranged on one of the outermost portions (the right side in FIG. 1A) of the tube elements (1). .
An end plate (4) for forming a refrigerant introduction path and a discharge path is provided on the other outermost side in the laminating direction (left side in FIG. 1A) adjacent to the outermost tube element (1). Each of the end plates (4) is stacked and provided with a refrigerant inlet (5) and an outlet (6) on the outer surface of the end plate (4). A part of these heat exchanger constituent members is formed of an aluminum brazing sheet, and is joined and integrated by brazing.

As shown in FIG. 2, each strip-shaped tube element (1) has a pair of plate-shaped forming plates (7).
It is formed by (7) facing each other. Each dish-shaped forming plate (7) is formed by a press-formed product of an aluminum brazing sheet, and is formed in an outer peripheral rectangular shape as shown in FIGS. Two recessed portions (9) and (9) for forming the refrigerant passage extending in the longitudinal direction are press-formed side by side in the widthwise direction at the intermediate portion excluding the portion, and the plate-shaped plates (7)
The two refrigerant passages (10) (10) are formed in the widthwise direction by joining and integrating the parts (7) so as to face each other.

Inner fins (11) are arranged in the refrigerant passages (10) of each of the strip-shaped tube elements (1). This inner fin (11) is
As shown in (c), it is formed in a wave shape to secure a large heat transfer area, and the wave peaks and valleys are directed in the width direction of the tube element (1) to reduce the pressure loss of the refrigerant. And are disposed in the refrigerant passages (10) and (10). The inner fin (11) is of a wide width disposed so as to extend over the two front and rear refrigerant passages (10) and (10) in the strip-shaped tube element (1). Flat part (11a
) Is formed. The flat portion (11a) is formed so as to be located at an intermediate height between peaks and valleys of the wave, and the flat portion (11a) is connected to the front and rear refrigerant passages (10) in the strip-shaped tube element (1). ) (10) Partitioning part (7a)
By sandwiching the inner fin (11) from both sides in (7a), the inner fin (11) is positioned in the width direction in the strip-shaped tube element (1). Further, since the inner fin (11) is positioned in the longitudinal direction in the strip-shaped tube element (1), FIG.
As shown in (d), the outer edges in the width direction of both ends of the recesses (9) and (9) for forming the refrigerant passages of the dish-shaped forming plate (1) have inwardly arcuate walls (9a) and (9). 9a), and the ends of the inner fin (11) are brought into contact with these arc-shaped walls (9a) (9a).

In the dish-shaped plate (7), both ends of both the recesses (9) and (9) for forming the refrigerant passages respectively project outwardly deeper than the depth of the recesses (9). The two tank parts (12) (12) (12) (12) are press-formed. Then, as shown in FIG. 3, the corresponding tank portions (12a) of the plate-shaped forming plates (7) and (7) of the adjacent tube elements (1) and (1) adjacent to each other.
(12b) are connected to each other so that the refrigerant flows between the tube elements (1).

The tank portions (12a) and (12b) are connected in an internal communication state by the following joining structure. That is,
As shown in FIG. 3, the tank portions (12a) and (12b)
It is press-formed into a flat short cylindrical shape that protrudes outward.
One of the cylindrical tank portions (12a) is tapered and tapered at its distal end side through an annular step (13) at an intermediate portion in the axial direction to improve brazing properties. The tip portion (14) is fitted into the other short cylindrical tank portion (12b) so as to be fitted and fitted, and is joined and integrated by brazing. With such a joint structure, the tank part (12a)
(12b) The area of the passage of the refrigerant at the junction between them is enlarged to almost the same as the area of the passage before and after the junction, whereby the flow of the refrigerant becomes smooth. Therefore, the size of the tank portions (12a) and (12b) can be reduced, the core area effective for heat exchange between the refrigerant and the air can be increased, the pressure loss on the air side can be reduced, and the refrigerant side can be reduced. Pressure loss can be reduced, and a compact and high-performance evaporator can be realized. The positioning of the tank portions (12a) (12b) is performed by bringing the tip of the other short cylindrical tank portion (12b) into contact with the annular step (13) of the one short cylindrical tank portion (12a). Done in

In the above-mentioned laminated evaporator, as shown in FIG. 5, the refrigerant flowing from the refrigerant inlet portion (5) moves the evaporator forward and backward with respect to the air (A) and the leeward air. After flowing through the group of refrigerant passages (P1)... (P2)... In the meandering shape, the refrigerant passages (P3)... (P4). Thus, the following structure is adopted.

That is, the strip-shaped tube element (1) ...
As shown in FIGS. 6 and 7, three types of first to third dish-shaped forming plates (71), (72), and (73) are used as the dish-shaped forming plate (7). . First
As shown in FIG. 7 (a), the dish-shaped plate (71) has four short cylindrical tank portions (12), (12), (12), (12).
Are open, and the two tank portions (12) (12) adjacent to each other at each end are independent without communication. The second dish-shaped forming plate (72) is a plate having a partitioning function for meandering the refrigerant.
As shown in (b), four short cylindrical tank parts (12)
(12) The tip of one (121) of (12) and (121) is blindly closed. The third dish-shaped forming plate (73) allows the refrigerant to flow from the leeward side to the leeward side, and as shown in FIG. 7 (c), the two tank portions (12) (12) ( 12) is communicated via the communication part (15).

As shown in FIG. 6, the pair of strip-shaped tube elements (1) (1) adjacent to each other in the middle part in the stacking direction of the evaporator are used as the adjacent plate-shaped forming plates. Dish-shaped plates (72) and (72) are used. These second dish-shaped forming plates (72) (72)
Are the same and are blindly closed tanks (12
1) By positioning the (121) on the lower side and stacking and joining the outer surfaces thereof facing each other, the lower tank portions (12)
(12) are both closed and partitioned. Also, one side in the stacking direction sandwiching the second dish-shaped forming plates (72) (72),
That is, the first dish-shaped plate (7) is used as the dish-shaped plate constituting the left strip-shaped tube element (1).
The third dish-shaped plate (73) is used as a dish-shaped plate constituting the strip-shaped tube element (1) on the other side, that is, the right side. The third dish-shaped forming plate (73) is a tank communicating portion (1).
5) is stacked on the lower side.

As a result, as shown in FIG. 5, the refrigerant rises in the left half of the refrigerant passages (P1)... On the leeward side and then meanders to the right half of the leeward side. (P2) ...
Descend the group and then, via the tank communication (15),
This time, the right half refrigerant passage (P3) on the upwind side moves up the group and further meanders to the left half refrigerant passage (P3) on the upwind side.
4)… It is distributed along the route of descending the group. In this manner, the leeward refrigerant passage (P) is formed such that the refrigerant forms a counterflow with the air (A) flowing in the evaporator in the front-rear direction.
1) (P2) ... A refrigerant passage (P3) on the windward side from the group.
(P4): By being distributed to the group, the heat exchange efficiency can be improved and the performance can be improved. In addition, in a configuration in which the refrigerant meanders on the leeward side and the leeward side, respectively, the first group of refrigerant passages (P1) and the last group of refrigerant passages (P4). Since the refrigerant passage (P2)... Group and the third refrigerant passage (P3)... Group that pass through the third face face each other in front and rear, the temperature of air flowing in the evaporator in the front-rear direction on the left and right sides The difference can be reduced and efficient heat exchange is realized.

In the formation of the refrigerant passage, the outermost dish-shaped plate (7) on the side plate (3) side is used.
It is necessary to close the four tank portions (12) of ((73)). In the present embodiment, the closing is performed by the side plate (3). That is, as shown in FIG. 8, the side plate (3) is a dish-shaped plate (7).
Are formed in an outer peripheral shape of the same size as the above, and correspond to the positions of the four short cylindrical tank portions (12)... Of the dish-shaped forming plate (7). (16) (16)
(16) is press-formed. These short tube parts (16)
Is blindly closed at its tip. And
The side plate (3) consists of these short cylinders (16) (16)
(16) The (16) is fitted and closed in the short cylindrical tank portion (12) (12) (12) (12) of the dish-shaped forming plate (7) in a compatible internal fitting state, and is laminated and joined. . That is, the side plate (3) not only protects the outermost outer fins (2) but also protects the tank portions (12) (12) (12) (12) of the outermost dish-shaped forming plate (7). It also has a function as a cap, which can reduce the number of parts of the evaporator, and can change the type of the dish-shaped plate (7) used in the laminated evaporator to, for example, 3 as described above. Types (71), (72), and (73) can be limited to a small number.

In the formation of the above-mentioned refrigerant passage, the end plate (4) for controlling the entrance and exit of the refrigerant is constituted as follows. That is, as shown in FIG. 9, the end plate (4) is provided with a first end plate (21),
The second end plate (22) and the intermediate plate (23) are overlapped. Any plate (21)
(22) and (23) are also formed in the same rectangular shape as the dish-shaped forming plate (7). The first end plate (21) is made of a press-formed aluminum brazing sheet in the same manner as the dish-shaped forming plate (7). Two recesses (28) and (28) are formed side by side in the width direction, and two refrigerants in the width direction are provided between the first end plate (21) and the intermediate plate (23). A passage is formed. Further, in the first end plate (21), a total of four tank portions projecting outward beyond the depth of the concave portion (28) are respectively provided at both ends of the concave portions (28) and (28) for forming the refrigerant passage. (21a) (21b) (21c
) (21c) is press formed. The lower tank portion (21c) (21c) is blindly closed.
Further, ribs (29) for guiding the refrigerant protruding toward the intermediate plate (23) are raised in the concave portions (28) (28) for forming the refrigerant passage.

In the second end plate (22), a coolant inlet hole (22a) is formed at the center in the height direction at the rear side in the width direction, and is formed at the front side in the width direction. Has a refrigerant outlet hole (22b) formed therein. Further, in a mode including a refrigerant inlet hole (22a) and a refrigerant outlet hole (22b), the inner surface of the second end plate (22) has a refrigerant outlet passage forming recess (22c) extending downward from the center in the height direction. ) (22d) are formed by press molding before and after in the width direction of the end plate. A rib (26) for guiding the flow of the refrigerant is formed in the refrigerant outlet passage forming recess (22d) including the refrigerant outlet hole (22b).

Also, at the lower end of the intermediate plate (23),
Recess (28) for forming a refrigerant passage in the first end plate (21)
Refrigerant passage holes (23a) and (23b) are formed so as to communicate the refrigerant outlet passage forming recesses (22c) and (22d) of the second end plate (22) with the refrigerant outlet holes (23a) and (23b).

Then, the first and second end plates (2
1) (22) is laminated with an intermediate plate (23) interposed therebetween, so that the first and second end plates (2
1) A refrigerant introduction path (24) is formed on the rear side in the width direction and a refrigerant discharge path (25) is formed on the front side by the (22) and the intermediate plate (23), and the refrigerant flowing from the refrigerant inlet hole (22a) is formed. Flows out from the rear tank (21a) at the upper end of the first end plate (21) through the refrigerant introduction path (24), while flowing from the front tank (21b) at the upper end of the first end plate (21). The inflowing refrigerant passes through the refrigerant outlet path (25) and flows out of the refrigerant outlet hole (22b) of the second end plate (22).

In the end plate (4), the outer surface of the first end plate (21) is sandwiched between the outer fins (2), and the outer plate-shaped forming plate (7) of the outermost strip-shaped tube element (1) is formed. The upper and lower short cylindrical tank portions (21a), (21b), (21c) and (21c) are laminated on the outer side of the upper and lower short cylindrical tank portions (12) and (1) of the dish-shaped forming plate (7).
2) The inner short fitting tank 12 is fitted in the fitting inner fitting state to close the lower short cylindrical tank part 12 and is connected to the upper short cylindrical tank part 12 in an internal communication state. Further, a union (27) for a refrigerant inlet / outlet is connected to the outer surface of the second end plate (22) at the center in the height direction, corresponding to the refrigerant inlet hole (22a) and the outlet hole (22b). .

An embodiment of the present invention has been described above.
The present invention is not limited to this, and various changes can be made without departing from the scope of the invention. For example,
As shown in FIG. 4 (a), one of the short cylindrical tank portions (12a) has an annular step (13) as a joint structure between the tank portions.
Without passing through, the diameter is reduced in a tapered manner toward the distal end portion, and the reduced diameter portion is connected to the other short cylindrical tank portion (12).
A structure that is taperedly fitted in b) and joined and integrated may be adopted. Also, as shown in FIG.
The diameter is reduced by the same diameter through the annular step (13) at the axially intermediate portion, and the reduced diameter tip (14) is fitted into the other short cylindrical tank (12b) in a conforming inner fitting state. Alternatively, a structure integrated with brazing may be employed. In FIG. 4 (b), (14a) is a tapered portion provided at the tip of the reduced diameter tip (14) so that the fitting operation can be easily performed.

In the above embodiment, the strip-shaped tube element is configured as a double-tank type having tank portions at both ends, but a single-tank type having a tank portion only at one end, that is, a strip type tube element. The U-shaped refrigerant passage may be provided in the plate-shaped tube element.

[0026]

EXAMPLES A laminated evaporator of the present invention having the above-described structure and a laminated evaporator of a conventional structure were prepared, and a comparative test was performed. The conventional laminated evaporator has no inner fin in the strip-shaped tube element, but only raises a rib extending in the longitudinal direction in the recess for forming the refrigerant passage of the dish-shaped plate in order to secure a heat transfer area. The tip of the rib is joined and integrated with the bottom surface in the recess of the other dish-shaped plate. Further, each strip-shaped tube element is provided with only one refrigerant passage extending in the longitudinal direction, and is of a cross flow type without forming a counterflow with air flowing in the evaporator in the front-rear direction. . However, the refrigerant flows in a meandering manner in the cross direction. Further, the joining structure of the tank portions of the adjacent plate-shaped forming plates of the adjacent strip-shaped tube elements has an inwardly directed annular flange portion at the tip of the tank portion, and the annular flange portions abut each other. It is joined and integrated. In this conventional configuration, one having a width in the front-rear direction of 75 mm (Comparative Example 1) and one having a width of 60 mm (Comparative Example 2) were prepared. On the other hand, the laminated evaporator of the present invention prepared in the above-described embodiment structure was designed to have a width in the front-rear direction of 60 mm (Example 1). The number of strip-shaped tube elements was 23 in each case.

As a result, the heat transfer area on the refrigerant side was 71 in Comparative Example 2 and 84 in Example 1 when Comparative Example 1 was 100. The air-side heat transfer area was 80 in Comparative Example 2 when Comparative Example 1 was 100.
In Example 1, it was 86. In addition, flow rate 100kg / h
The resistance of the refrigerant passage at the time of comparison was 100 (0.
19 kg / cm 2), the comparative example 2 has 211
(0.40 kg / cm 2), and 137 (0.
26 kg / cm @ 2). As a result, it has been confirmed that the adoption of the structure of the present invention makes it possible to make the refrigerant-side heat transfer area and the air-side heat transfer area wider and reduce the refrigerant passage resistance. As for the cooling performance, the result as shown in the graph of FIG. 10 was obtained. For example, the cooling performance at an air flow rate of 450 m3 / h was 3820 kcal / h in Comparative Example 1, and 3800 kcal / h in Example 1.
/ H, it was confirmed that the compact evaporator of Example 1 can exhibit the same cooling performance as the evaporator of Comparative Example 1.

[0028]

As described above, according to the laminated evaporator of the present invention, the end portions of the adjacent plate-shaped forming plates of the adjacent strip-shaped tube elements are connected to the outside by internally connecting the tube elements to each other. A short cylindrical tank portion is formed in a one-sided protruding shape, and the short cylindrical tank portions are joined by combining at least the distal end peripheral wall portions thereof in an inside / outside fitting state, so that the tank portion is made compact. And
Thereby, the core area effective for heat exchange between the refrigerant and the air can be increased, and the pressure loss on the air side can be reduced. Further, the flow of the refrigerant flowing in the tank portion can be made smooth, the resistance of the refrigerant passage can be reduced, and compactness and high performance can be realized.

Further, the strip-shaped tube element has a plurality of flat refrigerant passages in the width direction inside thereof, and the refrigerant is
Heat exchange efficiency can be increased by sequentially flowing from the leeward side refrigerant passage to the leeward side refrigerant passage so as to form an opposite flow with air flowing in the evaporator in the front-rear direction. And higher performance can be realized.

Further, since the inner fin, which is a separate component from the dish-shaped plate, is disposed in the refrigerant passage of the strip-shaped tube element, a very large heat transfer area for the refrigerant in the refrigerant passage is ensured. In addition, higher performance can be realized.

[Brief description of the drawings]

FIG. 1 shows a stacked evaporator according to one embodiment, wherein FIG. 1A is a front view, FIG. 1B is a right side view, and FIG.
Is a left side view, and FIG.

FIGS. 2A and 2B show a strip-shaped tube element, wherein FIG. 2A is an internal plan view, FIG. 2B is a cross-sectional view taken along the line II of FIG. 2A, and FIG. FIG. 2D is a cross-sectional view taken along line II-II, and FIG.

FIG. 3 is a cross-sectional view showing a joint structure between tank portions.

FIGS. 4A and 4B are cross-sectional views each showing a modified example of a joint structure between tank portions.

FIG. 5 is a perspective view showing a passage of a refrigerant in the stacked evaporator.

FIG. 6 is an exploded perspective view of the stacked evaporator (however, outer fins are omitted).

FIGS. 7A to 7C are first to third views, respectively.
It is an inner surface top view of each dish-shaped forming plate of FIG.

FIG. 8 is a perspective view showing a separated state of the side plate (however, outer fins are omitted).

FIG. 9 is a perspective view showing an end plate in an exploded state.

FIG. 10 is a graph comparing the cooling performance of Example 1 and Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Strip plate-shaped tube element 2 ... Outer fin 7 ... Dish-shaped forming plate 10 ... Refrigerant passage 11 ... Inner fin 12, 12a, 12b ... Short cylindrical tank part

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[Procedure amendment]

[Submission date] April 16, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

In the formation of the above-mentioned refrigerant passage, the end plate (4) for controlling the entrance and exit of the refrigerant is constituted as follows. That is, as shown in FIG. 9, the end plate (4) is provided with a first end plate (21),
The second end plate (22) and the intermediate plate (23) are overlapped. Any plate (21)
(22) and (23) are also formed in the same rectangular shape as the dish-shaped forming plate (7). The first end plate (21) is made of a press-formed aluminum brazing sheet in the same manner as the dish-shaped forming plate (7). Two recesses (28) and (28) are formed side by side in the width direction, and two refrigerants in the width direction are provided between the first end plate (21) and the intermediate plate (23). A passage is formed. Further, in the first end plate (21), a total of four tank portions projecting outward beyond the depth of the concave portion (28) are respectively provided at both ends of the concave portions (28) and (28) for forming the refrigerant passage. (21a) (21b) (21c
) (21c) is press formed . Also, the coolant passage forming recess (28) (28), ribs for refrigerant guide which projects the intermediate plate (23) side (29) is raised.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

[Procedure amendment]

[Submission date] April 17, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

Then, the first and second end plates (2
1) (22) is laminated with an intermediate plate (23) interposed therebetween, so that the first and second end plates (2
1) A refrigerant introduction path (24) is formed on the rear side in the width direction and a refrigerant discharge path (25) is formed on the front side by the (22) and the intermediate plate (23), and the refrigerant flowing from the refrigerant inlet hole (22a) is formed. the first end plate (21) while the tank portion or et outflow tank portion or we refrigerant flowing into the first end plate (21) is a refrigerant outlet passage through said refrigerant inlet passage (24) (2
5) through the refrigerant outlet hole (2) of the second end plate (22).
2b).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

In the end plate (4), the outer surface of the first end plate (21) is sandwiched between the outer fins (2), and the outer plate-shaped forming plate (7) of the outermost strip-shaped tube element (1) is formed. The upper and lower short cylindrical tank portions (21a), (21b), (21c) and (21c) are laminated on the outer side of the upper and lower short cylindrical tank portions (12) and (1) of the dish-shaped forming plate (7).
2) The inside is fitted in a suitable fitting state and is connected to the short cylindrical tank part (12) in an internal communication state. Further, a union (27) for a refrigerant inlet / outlet is connected to the outer surface of the second end plate (22) at the center in the height direction, corresponding to the refrigerant inlet hole (22a) and the outlet hole (22b). .

Claims (2)

[Claims] 1. A plurality of strip-shaped tube elements formed by opposing and matching a pair of dish-shaped forming plates, and these strip-shaped tube elements are stacked in the thickness direction with outer fins interposed therebetween. In the laminated type evaporator, the strip-shaped tube element is provided with a plurality of flat refrigerant passages in the width direction thereof, so that the refrigerant forms a counter flow with air flowing in the evaporator in the front-rear direction. In this case, the inner fin, which is a separate component from the dish-shaped plate, is arranged in the refrigerant passage of the strip-shaped tube element in the refrigerant passage from the leeward side refrigerant passage to the leeward side refrigerant passage. The end of the adjacent plate-shaped forming plate of the adjacent strip-shaped tube element is provided with an outwardly projecting short cylindrical tank portion for internally communicating the tube elements with each other. Wherein the short cylindrical tank portions are joined together by combining at least the distal end peripheral wall portions thereof into an inner / outer fitting state. 2. A plurality of strip-shaped tube elements formed by opposing and matching a pair of dish-shaped forming plates, and these strip-shaped tube elements are stacked in the thickness direction with outer fins interposed therebetween. In the laminated type evaporator, an outer protruding short cylindrical tank portion for internally communicating the tube elements is formed at the end of the adjacent plate-shaped forming plate of the adjacent strip-shaped tube element. A laminated evaporator, wherein the short cylindrical tank portions are joined by combining at least the distal end peripheral wall portions thereof into an inner / outer fitting state.