JP2887444B2 - Stacked heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacked heat exchanger in which tube elements and fins are alternately stacked in a plurality of stages, for example, for use in a cooling cycle of a vehicle air conditioner.

[0002]

2. Description of the Related Art A laminated heat exchanger of this type, which is being developed by the applicant of the present invention, has a structure in which tube elements are stacked in multiple stages with fins interposed therebetween, and a pair of tanks is formed on one side of the tube element. The tank is communicated by a U-shaped heat exchange medium passage, adjacent tube elements are joined to each other to connect the tank appropriately, and a communication pipe extending between the tanks in the stacking direction is arranged. The heat exchange medium is guided to the tank.

[0003] Each tube element is formed by joining a brazing allowance for forming two forming plates at the edges thereof, and the communication pipe is formed by laminating the tube elements and fins to exchange heat. After the core of the vessel is formed, it is fitted into the groove and brazed together with the core of the heat exchanger.

[0004] As shown in FIG. 24, each forming plate 6, 7 constituting the tube element 3 is
At least the brazing margin 16 at the periphery of the tanks 8, 9 to which the communication pipe 28 is connected is formed with a flange 40 bent toward the non-joining side in order to increase the strength. Accordingly, the communication pipes 28 arranged in the grooves 29, 29 of the forming plates 6, 7 constituting the tube element 3 are brazed.

[0005]

However, in the laminated heat exchanger having the above-mentioned structure, as shown in FIG. 25, the forming plates 6 and 7 to be joined in the middle are flanges bent to the opposite side. Because it has 40, 40,
When the tube element 3 formed by joining the forming plates 6 and 7 and the communication pipe 28 are brazed to each other and the brazing material is poor around the brazing material, the flange 4
A substantially triangular gap A may be formed between 0 and 40 and the communication pipe 28.

For this reason, as shown by the arrow in FIG.
When water (especially drain water) enters the gap A between the end of the flange 40 and the communication pipe 28, the water tends to remain in the gap A, and the water may freeze or melt. By repeating this process, the tube element 3 or the communication pipe 28 may be damaged, and the heat exchange medium may leak.

Further, even if the water accumulated in the gap A does not repeatedly freeze and melt as described above, the water remains in the gap A, thereby causing the tube element 3 and the communication pipe 28 to become inactive. The possibility of corrosion was also considered.

Therefore, the present invention has been made in view of the above problems,
It is an object of the present invention to provide a laminated heat exchanger that can prevent water from remaining between a tube element and a communication pipe.

[0009]

According to the laminated heat exchanger of the first aspect, two molded plates having flanges formed at the edges are joined by a brazing allowance and are joined to one side. A tube element having a pair of tanks and a heat exchange medium passage communicating the tanks is stacked in a plurality of stages with fins interposed therebetween, and the adjacent tube elements are appropriately communicated with the tank, and the pair of tanks are connected. In a laminated heat exchanger that forms a flow path through which a heat exchange medium flows by interposing a communication pipe that is arranged in a groove between and connects to a predetermined tank, in the groove, the communication pipe is One of the two forming plates constituting the tube element is in contact with the other, and the other is not in contact. According to the second and third aspects, in order to make the communicating plate of the forming plate not contact with the communicating pipe, the flange or the brazing allowance following the flange is formed by cutting out the configuration or the flange which is notched at the periphery of the groove. The configuration may be such that the diameter of the groove is enlarged while holding the groove.

Further, according to the laminated heat exchanger of the fourth aspect, the two forming plates having the flanges formed at the edges are joined by a brazing allowance to form a pair of tanks on one side and this tank. A plurality of tube elements having a heat exchange medium passage communicating with each other are stacked in a plurality of stages with fins interposed therebetween, and the adjacent tube elements are appropriately communicated with the tank, and are arranged in a groove between the pair of tanks. In a laminated heat exchanger having a flow path through which a heat exchange medium flows by interposing a communication pipe connected to a predetermined tank, the communication pipe is included in the groove, and the communication pipe forms the tube element. Both of the two molding plates abut alternately in the groove. According to the fifth and sixth aspects, in order to alternately contact the communicating pipe of the forming plate with the communicating pipe, the flange and the brazing allowance are cut off at the peripheral edge of the groove at the inner center as a boundary or It is also possible to adopt a configuration in which one of the diameters is enlarged with the flange at the inner center and the boundary.

Further, according to claim 7, a notch may be formed in the molding plate following the groove.

[0012]

According to the stacked heat exchanger of the present invention, one of the two forming plates forming the tube element has a flange and a brazing allowance following the flange. The groove is cut off at the periphery, or the diameter of the groove is increased while having the flange, so that the groove is not in contact with the communication passage, and an opening is formed in the gap between the forming plate and the communication passage, and the opening is formed in the gap. Water is hard to collect.

[0013] According to the laminated heat exchanger of the fourth to sixth aspects, the tube element 2
In both of the two forming plates, the flange and the brazing allowance following the flange are notched or expanded at one end with the flange at the inner center of the groove, so that the diameter of the groove is enlarged, so that The pipe is brought into contact with or not in contact with the communication pipe, and an opening is formed in the gap between the forming plate and the communication pipe, so that water hardly accumulates in the gap.

According to the stacked heat exchanger of the present invention, since the cutout is reliably opened to the atmosphere, it is good for preventing the accumulation of water.

[0015]

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

1 (a) and 1 (b), a laminated heat exchanger 1 has, for example, fins 2 and tube elements 3 alternately laminated in a plurality of stages, and heat exchange is provided at one end of the tube elements 3 in the laminating direction. For example, in a four-pass evaporator provided with an inlet portion 4 and an outlet portion 5 of the medium, the tube element 3 is, except for a part, formed of two forming plates 6, 6.
7 (shown in FIGS. 2 and 3), and a U-shaped heat exchange through which a heat exchange medium is passed from two tanks 8 and 9 to one end to the other end. Each has a medium passage.

The forming plates 6 and 7 are formed by pressing a plate made of aluminum and having a brazing material attached thereto, and as shown in FIGS. Two tank forming bulging portions 11 and 12 having holes 33 formed therein are formed, followed by a passage forming bulging portion 13, and the tank forming bulging portions 11 and 12 are formed. A groove 29 having the same diameter as that of the communication pipe 28 is formed between the communication pipe 28 to be described later and the tank formation bulge 1 is formed in the passage bulge 13.
A ridge 14 is formed extending from between the gaps 1 and 12 to the vicinity of the other ends of the molding plates 6 and 7. Further, a protruding piece 15 for preventing the fins 2 from dropping off at the time of assembly before brazing is provided at the other end of the forming plate. Further, a brazing margin 16 is formed over the periphery from the tank forming bulging portions 11 and 12 to the passage forming bulging portion 13.

The bulging portions 11 and 12 for forming tanks are
The bulging portion 13 is formed to be larger than the bulging portion 13 for forming a passage, and the ridge 14 is formed so as to be flush with a brazing allowance 16 on the peripheral edge of the forming plate.
When the joint 7 is joined by the brazing allowance 16, the ridge 14 is also joined, and the tanks 8 and 9 are formed by the opposed tank-forming bulging parts 11 and 12, and the opposed passage-forming bulging parts. A U-shaped heat exchange medium passage 10 that connects the tanks is formed by 13 and 13.

The tube element 3a at a predetermined position closer to one side from the center does not have the groove 29, and is enlarged so that one tank 8a is close to the other tank 9. Further, the tube elements 3b disposed at both ends in the laminating direction are configured by joining flat plates 17 to the forming plates 6, 7 shown in FIG. 2 or FIG.

Then, the adjacent tube elements 3
Are abutted by the bulging portions 11 and 12 for forming tanks of the respective forming plates 6 and 7 to form first and second two tank groups 30 and 31 extending in the stacking direction.
One of the tank groups 30 including the enlarged tank 8a is composed of tank groups 30a and 30b separated by a partition portion 32 located substantially at the center in the stacking direction. The other tank group 31 communicates via the communication holes 33 formed in the formation bulging portions 8 and 9, and the other tank group 31 communicates via the communication holes 33 without being partitioned by the tank groups 31 a and 31 b. It is configured.

In this embodiment, 26 tube elements are stacked, and the tube element 3a having the enlarged tank 8a is interposed at the 21st from the end where the entrances 4 and 5 described below are formed. And the partition 3
Numeral 2 is arranged at a portion where the thirteenth and fourteenth tube elements 3 are joined from the end where the entrances 4 and 5 are formed. Here, even if the partition part 32 is configured by not forming a communication hole in one of the molded plates to be joined,
It is also possible to use a molding plate similar to the other molding plates and close the communication hole with a blind plate when joining them.

The inlet 4 and the outlet 5 are provided with an enlarged tank 8a.
Provided at an end far from the outside, the entrance / exit passage forming plate 18 is laminated on the flat plate 15 from the outside, and an entrance passage 34 and an exit passage 35 are formed from the middle in the longitudinal direction of the tube element 3b to the tank side, A connection plate 19 for connecting an expansion valve (not shown) to the plate 18 for forming an entrance / exit passage is provided.

The inlet passage 34 and the enlarged tank 8a are communicably connected to each other by a communication pipe 28 fitted in the groove 29 of the tube element 3 disposed therebetween, and the tank group 30b and the outlet passage 35 beside the tank group 30b. Communicate with each other through a hole (not shown) formed in the flat plate 17.

Thus, as shown in FIG.
After flowing into the expansion tank 8a through the communication pipe 28 through the inlet passage 34, the heat exchange medium spreads to the tank group 30a through the communication hole 33, and then passes through the heat exchange medium passage 10 through the communication hole 33. It flows into the tank group 31a and is sent to the tank group 31b through the communication hole 33. Further, after flowing into the group of tanks 30 b through the heat exchange medium passage 10, it flows out of the outlet 5 through the inlet / outlet passage 35. For this reason, the heat of the heat exchange medium is transmitted to the fins 2 and exchanged with the air passing between the fins in the process of flowing through the heat exchange medium passage 10.

Further, as shown in FIGS. 2 and 5, the forming plate 6 is provided with an edge of a brazing allowance 16 around the periphery of the passage-forming bulging portion 13 and the tank-forming bulging portions 11 and 12. In order to increase the strength of the forming plate 6, the forming plate 6 is bent toward the non-joining side to form a flange 40. This flange 4
0 is naturally also provided around the groove 29.
On the other hand, as shown in FIGS. 3 and 5, the forming plate 7 has a flange 40 at the edge of the brazing allowance 16 on the periphery of the passage forming bulging portion 13, but has a tank forming portion. Between the bulging portions 11 and 12, a part of the flange 40 and the brazing allowance 16 on the peripheral edge on the groove portion 29 side are cut out in a substantially arc shape. That is, the diameter of the groove 29 is enlarged.

Therefore, as shown in FIGS. 5 and 6,
The width of the molding plate 7 from the tank forming bulging portion 11 to the outer edge on the groove portion side is reduced by the absence of the flange and a part of the brazing allowance 16, and the molding plate 6 and the molding plate 7 are joined. In this case, the groove 2 has such a diameter difference that the flange 40 and the like of the forming plate 6 can be seen from the forming plate 7.
9, 29 are formed. Therefore, when the communication pipe 28 is fitted into the grooves 29, 29, the tube element 3 comes into contact with the communication pipe 28 at the flange 40 on the forming plate 6 side, and the forming plate 7 side Due to the increase in the diameter, the communication pipe 28 does not contact.

However, when the core of the heat exchanger is brazed in the furnace after fitting the communication pipe 28 into the groove 29, as shown in FIG. The gap formed by the plate 7 has a large opening because there is no flange and a part of the brazing allowance 16.
Side, so that it is difficult for water to accumulate even if water enters the gap.

In the above description, the forming plate 7 is fixed to the flange 40 and the brazing allowance 1 around the groove 29.
It was explained that part of 6 was cut out in a substantially arc shape,
The present invention is not limited to this. For example, as shown in FIG. 8, the forming plate 7 ′ may have the flange 40 and the diameter of the groove 29 may be enlarged.

For this reason, as shown in FIGS. 9 and 10, the forming plate 7 'has an outer edge on the groove side from the bulging portion 11 for forming the tank because the flange and the brazing allowance are bent toward the tank. When the forming plate 6 and the forming plate 7 ′ are joined together, there is a shift such that the flange 40 and the like of the forming plate 6 can be seen from the forming plate 7. Therefore, when the communication pipe 28 is fitted into the groove 29, the communication pipe 28 abuts on the flange 40 of the forming plate 6, and the forming plate 7 is disengaged from the communication pipe 28 due to an increase in the diameter of the groove 29. Be in contact.

However, when the core of the heat exchanger is brazed in the furnace after the communication pipe 28 has been fitted into the groove 29, as shown in FIG. Has a large opening on the forming plate 7 'side as much as the flange and the brazing allowance 16 are bent. Therefore, even if water enters the gap, it is difficult for the gap to accumulate. .

The configuration of the other part of the molding plate 7 'is as follows.
Since it is the same as the forming plate 7, the description thereof is omitted, and other configurations of the heat exchanger such as the forming plate 6, the fins 2, the entrance / exit passage forming plate 17, the flow of the heat exchange medium, and the like are the same as those of the above-described embodiment. Therefore, the description is omitted.

Further, as shown in FIG. 12, a bay-shaped notch 41 is formed on the side of the ridge 14 inside the groove 29 of the forming plate 6a.
As shown in FIGS. 13 and 14, inside the forming plate 7a or the forming plate 7a '
A bay-shaped notch 41 may be formed on the fourth side. Thereby, the forming plate 6a and the forming plate 7a or the forming plate 6a and the forming plate 7a 'are joined to form a tube element, and when the communication pipe 28 is fitted into the groove 29, the notch 41 is formed. Since the inside of the groove 29 and the tube element are separated from each other, the gap is reliably opened to the atmosphere, and the accumulation of water can be favorably prevented. A flange 40 is formed on the periphery of the notch 41 of the forming plates 6a, 7a, 7a 'as shown in FIGS.

Next, a second embodiment of the present invention and some modifications thereof will be described with reference to FIGS.

The tube element 3 ′ constituting the main part of the laminated heat exchanger 1 is formed by joining two molded plates 20 together. The molded plate 20 is shown in FIG. As shown, the flange 4 is located in the groove 29 of the bulge 11
0 and a part of the brazing allowance 16 are cut off. That is, the diameter is enlarged by the cutout.

For this reason, the forming plate 20 is provided with the flange of the groove 29 of the bulging portion 11 for tank formation and the brazing allowance 1.
Because there is no part of 6, as shown in FIGS. 16 and 17,
The width from one tank forming bulging portion 11 to the outer edge on the groove side is small, and when the forming plates 20 are joined together, the flange 40 of the other forming plate 20 and the like from both the forming plates 20 Groove part 2 is visible enough
9, 29 are alternately formed. Therefore, when the communication pipe 28 is fitted into the groove 29, the tube element 3 ′ abuts the communication pipe 28 at the flange 40 on one groove side of the forming plate 20, and the tube element 3 ′ is in contact with the other groove 29. Non-contact with the communication pipe 28 due to the diameter difference.

However, when the core of the heat exchanger is brazed in a furnace after the communication pipe 28 is fitted into the groove 29, as shown in FIG. Has a large opening in a staggered direction because there is no part of the flange and the brazing allowance 16, so that even if water enters the gap, it is difficult for the gap to accumulate.

Since two identical forming plates 20 are used for the tube element 3 ', the number of parts can be reduced as compared with the case where the former tube element 3 uses the forming plates 6 and 7.

In the second embodiment, similarly to the first embodiment, the forming plate 20 is moved from the upper end of the tank forming bulging portion 11 on the groove side to the bulging portion for the tank forming. Although it has been described that the flange 40 and a part of the brazing allowance 16 are cut out in a substantially arc shape up to the approximate center of 11 and 12, the present invention is not limited to this. For example, as shown in FIG. The plate 20 ′ is provided with a flange 40 and a brazing allowance 1 from the upper end portion on the groove side of the tank forming bulging portion 11 to substantially the center of the tank forming bulging portions 11 and 12.
6 may be bent in a substantially arc shape toward the tank.

For this reason, as shown in FIGS. 19 and 20, the forming plate 20 'has an outer edge on the groove side from the bulging portion 11 for forming the tank because the flange and the brazing allowance are bent toward the tank. When the molding plates 20 ′ are joined together, there is a shift such that the flange 40 of the other molding plate 20 can be seen from the molding plate 20. Therefore, when the communication pipe 28 is fitted into the groove 29, the tube element 3 'comes into contact with the communication pipe 28 at the flange 40 on one groove side of the forming plate 20', and the tube element 3 'on the other groove side. Due to the displacement, the communication pipe 28 does not contact.

However, when the core of the heat exchanger is brazed in a furnace after the communication pipe 28 is fitted into the groove 29 of the tube element 3 ', as shown in FIG.
The gap formed between the forming plates 20 ′, 20 ′ and the communication pipe 28 has large openings in a staggered direction because the flange and the brazing allowance are bent toward the tank side. Even if water penetrates into the gap, it is difficult for water to accumulate.

Further, as shown in FIGS. 22 and 23, a bay-shaped notch 41 is formed on the side of the ridge 14 inside the groove 29 of the forming plate 20a and the forming plate 20a '. Is also good. Thereby, the forming plates 20a or the forming plates 20a 'are joined to form a tube element 3', and when the communication pipe 28 is fitted into the groove 29, the notch 41 forms the top of the groove 29. Since the side and the tube element 3 'are in a separated state, the gap is reliably opened to the atmosphere, and the accumulation of water can be prevented well.
The notch 41 of the forming plates 206a and 20a '
A flange 40 is formed on the periphery of the.

[0042]

As described above, according to the stacked heat exchanger of the first to third aspects, one of the two forming plates constituting the tube element has one of the communicating passages and the non-contacting member. Because it is in contact, a large opening is formed between the forming plate and the communication passage, and it is difficult for water to accumulate in the gap between the tube element and the communication passage. It is possible to prevent the communication passage from being damaged and the communication passage from being corroded.

Further, according to the stacked heat exchanger of the fourth to sixth aspects, the tube element constituting the tube element 2
Since both of the two forming plates are in contact with the communication path alternately, a large opening is formed between the forming plate and the communication path, and water is formed in a gap between the tube element and the communication path. Since it is difficult for water to accumulate, it is possible to prevent water from repeatedly freezing and melting, thereby damaging the communication passage or corroding the communication passage.

Further, according to the laminated heat exchanger of the present invention, the gap formed by the notch is reliably opened to the atmosphere, which is good for preventing accumulation of water.

[Brief description of the drawings]

FIG. 1 (a) is a front view showing an overall configuration of a stacked heat exchanger according to a first embodiment of the present invention, and FIG. 1 (b) shows an overall configuration of the stacked heat exchanger according to the first embodiment. It is a bottom view.

FIG. 2 is an explanatory view showing a configuration in which a flange at a peripheral edge of a groove is not cut out of two forming plates constituting a tube element of the laminated heat exchanger.

FIG. 3 is an explanatory view showing a configuration in which a flange at a peripheral edge of a groove is cut out of two forming plates constituting a tube element of the laminated heat exchanger.

FIG. 4 is an explanatory diagram showing a flow of a heat exchange medium of the above-mentioned laminated heat exchanger.

FIG. 5 is an enlarged view of a main part showing a state in which a tube element is formed by joining two molding plates of the above, and a communication pipe is arranged in a groove portion thereof.

FIG. 6 is a sectional view taken along line AA in FIG.

FIG. 7 is an essential part enlarged view showing a brazed state of the tube element according to the first embodiment;

FIG. 8 is an explanatory view showing a modified example of the first embodiment in which the diameter of the two forming plates constituting the tube element of the laminated heat exchanger is increased while the groove has a flange while having a flange.

9 is an enlarged view of a main part showing a state in which a tube element is formed by joining the molding plate shown in FIG. 3 and the molding plate same as the above and a communication pipe is arranged in a groove portion thereof.

FIG. 10 is a sectional view taken along the line BB in FIG.

FIG. 11 is an enlarged view of a main part showing a brazed state of the tube element according to the first embodiment.

FIG. 12 is an explanatory view showing a modified example inside a groove of the molded plate shown in FIG. 2;

FIG. 13 is an explanatory view showing a modified example inside the groove of the molded plate shown in FIG. 3;

FIG. 14 is an explanatory view showing a modified example inside the groove of the molded plate shown in FIG. 8;

FIG. 15 is an explanatory diagram showing a configuration of a forming plate used for a tube element according to a second embodiment of the present invention.

FIG. 16 is an enlarged view of a main part showing a state in which a tube element is formed by joining two molding plates of the above and a communication pipe is arranged in a groove portion thereof.

FIG. 17 is a sectional view taken along the line CC in FIG.

FIG. 18 is an enlarged view of a main part showing a brazed state of the above tube element.

FIG. 19 is an enlarged view of a main part showing a state where a tube element is formed by joining two forming plates as modified examples of the forming plate shown in FIG. 15 and a communication pipe is arranged in a groove portion thereof.

FIG. 20 is a sectional view taken along line CC of the above.

FIG. 21 is an enlarged view of a main part showing a brazed state of the tube element according to the first embodiment;

FIG. 22 is an explanatory view showing a modified example of the inside of the groove of the molded plate shown in FIG. 15;

FIG. 23 is an explanatory view showing a modified example inside the groove of the molded plate shown in FIG. 19;

FIG. 24 is an enlarged view of a main part showing a state in which two forming plates of a conventional laminated heat exchanger are joined to form a tube element, and a communication pipe is arranged in a groove portion thereof.

FIG. 25 is an explanatory view showing a state in which the tube element has failed to be brazed to the communication pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated heat exchanger 2 Fin 3 Tube element 3 'Tube element 6 Molding plate 6a Molding plate 7 Molding plate 7' Molding plate 7a Molding plate 8 Tank 9 Tank 10 Heat exchange medium passage 16 Brazing allowance 20 Molding plate 20 'Molding Plate 20a Forming plate 28 Communication pipe 29 Groove 40 Flange 41 Notch

Claims (7)

(57) [Claims] 1. A tube element having a pair of tanks and a heat exchange medium passage communicating with the tanks on one side, and fins formed by joining two formed plates having flanges formed at edges thereof by a brazing allowance. A plurality of layers are interposed and the adjacent tube elements are appropriately communicated with the tank, and heat exchange is performed by interposing a communication pipe arranged in a groove between the pair of tanks and connected to a predetermined tank. In the laminated heat exchanger having a flow path through which a medium flows, the communication pipe is in the groove, and the communication pipe is in contact with one of the two forming plates constituting the tube element, and the other is not in contact with the other. A stacked heat exchanger characterized by being in contact with each other. 2. The laminated heat-generating device according to claim 1, wherein the non-contact of the forming plate with the communicating pipe is such that a flange and a brazing allowance following the flange are cut off at the periphery of the groove. Exchanger. 3. The laminated heat exchanger according to claim 1, wherein the non-contact of the forming plate with the communication pipe is such that the diameter of the groove is enlarged while having the flange. 4. A tube element having a pair of tanks and a heat exchange medium passage communicating with the tanks on one side, and fins formed by joining two formed plates having flanges formed at edges thereof by brazing allowance. A plurality of layers are interposed and the adjacent tube elements are appropriately communicated with the tank, and heat exchange is performed by interposing a communication pipe arranged in a groove between the pair of tanks and connected to a predetermined tank. In the laminated heat exchanger having a flow path through which a medium flows, in the groove, the communication pipe is alternately applied to both of the two forming plates constituting the tube element by the groove. A stacked heat exchanger that is in contact with the heat exchanger. 5. The alternate contact of the forming plate with the communicating pipe is characterized in that the flange and the brazing allowance are cut off at the periphery of the groove at the inner center.
5. The laminated heat exchanger according to 4 . 6. The lamination mold according to claim 4 , wherein the alternate contact of the forming plate with the communication pipe is such that one of the diameters of the forming plate is increased with the flange at the center inward while maintaining the flange. Heat exchanger. 7. The molding plate according to claim 1, wherein a notch is formed following the groove.
5. The laminated heat exchanger according to 4 .