JP2005274010A - Stacked heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stacked heat exchanger with a plurality of stacked heat exchanger cores, having a reduced size. <P>SOLUTION: A cover member 12a is bent at its peripheral edge upward or downward to form cover side flanges 20u, 20d. Case side flanges 19u, 19d are brazed to the cover side flanges 20u, 20d. In proportion as the cover side flanges 20u, 20d and the case side flanges 19u, 19d extend upward or downward, there are less sideward protrusions, thus reducing the size of the stacked heat exchanger 1a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stacked heat exchanger suitable for an exhaust heat recovery heat exchanger or the like of a power generation system of an FCV vehicle (fuel cell vehicle).

  As a conventional laminated heat exchanger, what is shown in FIGS. 5 to 8 is known.

  As shown in FIG. 5, the laminated heat exchanger 1 is a box-shaped case in which a plurality of heat exchanger cores 2 are laminated with corrugated outer fins 3 interposed therebetween and an opening 18 is provided on the upper surface. 4 and the opening 18 is covered with an upper plate 12 as a lid member.

  As shown in FIG. 7, each heat exchanger core 2 is swelled at one end portion and the other end portion of the first and second tube sheets 6, 7 whose outer peripheral portions are caulked and brazed, and a refrigerant ( For example, an inlet tank 8 and an outlet tank 9 (see FIG. 9) for cooling liquid are formed, and a refrigerant passage 10 is arranged between the inlet tank 8 and the outlet tank 9. The inlet tanks 8 communicate with each other through a through hole 6a formed in the first tube sheet 6 and a through hole 7a formed in the second tube sheet 7, and the outlet tanks 9 communicate with each other. Are communicated with each other through a through hole 6b formed in the second tube sheet 7 and a through hole 7b formed in the second tube sheet 7.

  As shown in FIG. 5, the through-holes 7a and 7b are not formed in the second tube sheet 7 at the lowest level. Therefore, the refrigerant that has flowed into the lowermost heat exchanger core 2 flows into the heat exchanger core 2 adjacent to the upper side through the through-hole 6 a formed in the first tube sheet 6. As shown in FIG. 8, the refrigerant flowing into the outlet tank 9 of the other heat exchanger core 2 is also pushed up by the refrigerant flowing in from the heat exchanger core 2 adjacent to the lower side, and the heat exchanger core adjacent to the upper side. Flows into 2. Thus, the refrigerant flowing into the uppermost heat exchanger core 2 flows out through the outlet pipe 15.

  On the other hand, the heat exchange fluid (for example, gas) G flows into the case 4 from the inlet (introduction opening) 16 of the case 4, flows through the gap between the heat exchanger cores 2 in the direction shown in FIG. (Exhaust opening) 17 flows out to the outside. While the refrigerant flowing into each heat exchanger core 2 flows through the refrigerant passage 10, the refrigerant exchanges heat with the high-temperature heat exchange fluid G that flows along the outer fins 3 through the air gaps, and uses the heat exchange fluid G. Cooling. Note that heat exchange between the heat exchange fluid G and the refrigerant is not performed in the gap between the joint 11 on the outer periphery of each heat exchanger core 2 and the inner surface of the case 4. For this reason, this gap is filled with the sealing material 5.

  The corrugated outer fin 3 is arranged in a space between the adjacent heat exchanger cores 2 in contact with the heat exchanger core 2, and heat of the refrigerant and the heat exchange fluid is caused by the thermal conductivity. It functions as a heat exchange fin that improves the exchange efficiency.

As shown in FIGS. 5 and 7, a case side flange 19 for joining the upper plate 12 is provided around the opening 18 provided on the upper surface of the case 4. Here, the upper plate 12 and the case side flange 19 are brazed at a position separated from the first and second tube sheets 6 and 7 by a predetermined heat transfer distance L. When the heat transfer distance L is short, the heat when brazing the upper plate 12 and the case side flange 19 acts on the brazed portions of the first and second tube sheets 6 and 7, and the brazing of this portion melts. This is because there is a risk of doing so. For this reason, the heat transfer distance L is ensured by projecting the case side flange 19 to the side.
JP 2003-130572 A

  However, the conventional laminated heat exchanger has a problem in that the size of the laminated heat exchanger increases as the case-side flange projects sideways.

  In view of the above, an object of the present invention is to reduce overhanging at a joint portion between a lid member and a case side flange in a stacked heat exchanger, and to reduce the size of the stacked heat exchanger.

  In the invention of claim 1, the inlet tank 8 and the outlet tank 9 are formed by bulging one end and the other end of the first and second tube sheets 6, 7 joined at the outer periphery. A plurality of flat heat exchanger cores 2 in which a refrigerant passage is arranged between the inlet tank 8 and the outlet tank 9 are stacked so that the inlet tanks 8 and the outlet tanks 9 communicate with each other, and heat exchange is performed on the side surface. A fluid inlet 16 and outlet 17 are formed and inserted into the case 4 having an opening 18 at the top, and the case side flanges 19u and 19d provided on the periphery of the opening 18 of the case 4 and the lid member 12a of the opening 18 are brazed. In the laminated heat exchanger 1a, in which the heat exchange fluid is circulated in the gap between the heat exchanger cores 2 adjacent to each other to exchange heat between the refrigerant and the heat exchange fluid, the peripheral edge of the lid member 12a Folded upward or downward The lid side flanges 20u and 20d are formed by bending, and the case side flanges 19u and 19d and the lid side flanges 20u and 20d are formed so as to contact each other when the opening 18 is formed by the lid member 12a. The case side flanges 19u and 19d and the lid side flanges 20u and 20d are brazed.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the lid-side flange 20u is bent upward just above the inlet 16 and the outlet 17.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the lid-side flanges 20u, 20d are bent downward in a region covered with the heat insulating sheet 21.

  According to the first aspect of the invention, the periphery of the lid member 12a is bent upward or downward to form the lid side flanges 20u, 20d, and the case side flanges 19u, 19d and the lid side flanges 20u, 20d are brazed. Therefore, while securing a sufficient distance from the brazed portions of the first and second tube sheets 6 and 7, the side flanges 19u and 19d and the lid member 12a are less projected to the side, and the laminated heat The exchanger is downsized.

  According to the invention of claim 2, the lid-side flange 20 u is bent upward just above the inlet 16 and the outlet 17. When bent downward, the bent portion may reach the inlet 16 and the outlet 17 and obstruct the flow of the heat exchange fluid, but the case side flange 20u is bent upward as in the invention of claim 2. If so, there is no such thing.

  According to the invention of claim 3, in the region covered with the heat insulating sheet 21, the lid side flanges 20u, 20d are bent downward. In the laminated heat exchanger, there are cases where the periphery is covered with a heat insulating sheet 21, but since the portion bent upward protrudes outward, the heat insulating sheet 21 is easily cut at that portion. Even if the heat insulating sheet 21 can be wound without being cut off, the bent portion protrudes away from the outer wall of the case 4a, so that the heat insulating sheet 21 is protruded from the outer wall of the case 4a in the vicinity thereof. It becomes difficult to adhere. In order to prevent such a situation, the heat insulating sheet 21 may be divided into a plurality of pieces and pasted. As for the portion where the case side flange 20d is bent downward as in the invention of claim 3, it becomes difficult to cut even if the heat insulating sheet 21 is wound, and the adhesion to the case 4a is improved, and thus the heat insulating property is improved. To do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a laminated heat exchanger, FIG. 2 is a cross-sectional view of the C surface of FIG. 1, and FIG. 3 is a view of the laminated heat exchanger as viewed from the inlet side of the heat exchange fluid (arrows). It is a view D, a partial cross-sectional view).

  The laminated heat exchanger 1a according to the present embodiment is substantially the same as the conventional laminated heat exchanger 1 except that the case 4a and the upper plate 12 as a lid member are replaced with a case 4a and an upper plate 12a. It has a configuration. Therefore, the same reference numerals are given to the same components as those in the related art, and the detailed description thereof is omitted.

  As shown in FIG. 1, a rectangular opening 18 is formed on the upper side of the box-shaped case 4a. The opening 18 is covered with the upper plate 12a after the heat exchanger core 2 and the outer fin 3 are inserted into the case 4a.

  The periphery of the upper plate 12a is bent upward or downward to form lid side flanges 20u and 20d. As shown in FIG. 1, in the present embodiment, among the four sides of the substantially rectangular upper plate 12a, the pair of sides located above the inlet 16 and the outlet 17 when the upper plate 12a is mounted are arranged upward. A folded lid side flange 20u is formed, and a lid side flange 20d folded downward is formed in the other pair.

  Further, case side flanges 19u and 19d are formed on the periphery of the opening 18 of the case 4a. The case side flanges 19u and 19d abut on the lid side flanges (20u and 20d) when the opening 18 is covered with the upper plate 12a. Therefore, among the four sides of the substantially rectangular opening 18, a pair of sides located above the inlet 16 and the outlet 17 are formed with case-side flanges 19 u extending upward, and the other pairs are folded downward. A side flange 19d is formed.

  As shown in FIG. 2, the lid-side flange 20u bent upward and the case-side flange 19u extending upward are brazed at a joining point (heating point) P1. Here, in the joining point P1, the heat transfer distance (length along the upper plate 12a) L from the joining point P2 of the first and second tube sheets 6 and 7 is equal to or greater than a predetermined threshold Lth (for example, 20 mm). Is set as follows. The value of the threshold value Lth is a distance that ensures that the heat transmitted through the upper plate 12a does not melt the brazing of the first and second tube sheets 6 and 7 when the junction point P1 is heated. It is appropriately set according to the characteristics of 12a (for example, heat transfer coefficient). In the present embodiment, as shown in FIG. 2, it can be seen that the lid side flange 20u and the case side flange 19u are directed upward, so that the lateral protrusion is reduced while securing this distance. That is, according to the present embodiment, the laminated heat exchanger 1a can be reduced in size by preventing lateral protrusion while preventing melting of the first and second tube sheets.

  Further, as shown in FIG. 3, the lid-side flange 20d bent downward and the case-side flange 19d bent downward also secure a heat transfer distance L equal to or greater than the threshold value Lth, as in the case of bending upward. However, there is less overhanging to the side, and the effect that the stacked heat exchanger 1a can be reduced in size is obtained.

  In the present embodiment, the lid-side flange 20u is bent upward just above the inlet 16 and the outlet 17. This is because when the portion is bent downward at this portion, the bent portion may reach the inlet 16 and the outlet 17 and hinder the flow of the heat exchange fluid. In this embodiment, the lid-side flange 20u is bent upward at this portion to prevent an obstacle to the flow of the heat exchange fluid.

  Further, in the present embodiment, the lid-side flange 20d is bent downward in a region other than the portion directly above the inlet 16 and the outlet 17 in the peripheral portion of the upper plate 12a. As shown in FIG. 4, the laminated heat exchanger 1 a may be covered with a heat insulating sheet 21 in order to improve heat insulation. However, since the portion bent upward protrudes outward, the heat insulating sheet is easily cut at that portion. Even if the heat insulating sheet 21 can be wound without being cut off, the bent portion protrudes, so that it is difficult to make the heat insulating sheet 21 in close contact with the case 4a. In order to prevent such a situation, the heat insulating sheet may be divided into a plurality of pieces and pasted. However, this will take time and effort. So, in this embodiment, about the site | part which winds the heat insulation sheet 21, the lid side flange 20d is bend | folded below, and while making the heat insulation sheet hard to cut about the part, the adhesiveness with case 4a is improved. .

  Further, as shown in FIG. 4, the lid-side flange 20 u bent upward and the case-side flange 19 u extending upward also function as a guide when the heat insulating sheet 21 is wound. The heat insulating sheet 21 is provided with through holes 22 and 23 through which the inlet pipe 14 and the outlet pipe 15 projecting upward from the upper plate 12a are escaped (the pipes are loosely inserted).

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made to the above embodiments without departing from the scope of the invention.

The disassembled perspective view of the laminated heat exchanger concerning embodiment of this invention. Sectional drawing in the C surface of the laminated heat exchanger of FIG. The side view of arrow D of the laminated heat exchanger of FIG. Explanatory drawing which winds a heat insulation sheet around the laminated heat exchanger concerning embodiment of this invention. The exploded perspective view of the conventional laminated heat exchanger. Sectional drawing in the A surface of the laminated heat exchanger of FIG. BB sectional drawing of the laminated heat exchanger of FIG. Explanatory drawing of the flow direction of the refrigerant | coolant and the heat exchange fluid in the laminated heat exchanger of FIGS.

Explanation of symbols

1a Laminated heat exchanger 4a Case 12a Upper plate (lid member)
16 Inlet 17 Outlet 18 Opening 19u, 19d Case side flange 20u, 20d Cover side flange

Claims (3)

One end and the other end of the first and second tube sheets (6, 7) joined at the outer periphery are swelled to form an inlet tank (8) and an outlet tank (9), and the inlet tank (8 ) And the outlet tank (9), a plurality of flat heat exchanger cores (2) are stacked so that the inlet tanks (8) and the outlet tanks (9) communicate with each other. Then, the heat exchange fluid inlet (16) and outlet (17) are formed on the side surface and the opening (18) is formed in the upper part, and the case (4) is inserted into the periphery of the opening (18). The case side flanges (19u, 19d) provided and the lid member (12a) of the opening (18) are brazed, and the heat exchange fluid is circulated in the gap between the heat exchanger cores (2) adjacent to each other. Layered heat exchanger (1 In),
The periphery of the lid member (12a) is bent upward or downward to form lid side flanges (20u, 20d),
When the opening (18) is covered with the lid member (12a), the case side flange (19u, 19d) and the lid side flange (20u, 20d) are formed to contact each other,
The laminated heat exchanger, wherein the case side flange (19u, 19d) and the lid side flange (20u, 20d) are brazed.   The stacked heat exchanger according to claim 1, wherein the lid-side flange (20u, 20d) is bent upward just above the inlet (16) and the outlet (17).   The laminated heat exchanger according to claim 1 or 2, wherein the lid-side flange (20u, 20d) is bent downward in a region covered with the heat insulating sheet (21).

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