JP2012149794A - Brazing structure for tube-plateless heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a laminated heat exchanger without a tube plate, in which a casing is fitted on the outer periphery of the core and tanks are disposed at both ends thereof, the stacking height of the core is a manufacturing error, Providing a brazing structure that does not allow a gap between the casing and the tank even if it changes due to other factors.
SOLUTION: A stepped portion 10 is formed at one end in the height direction of an opening of a tank 7, the outer periphery of the opening of the tank 7 is fitted to the inner surfaces of a main body member 8 and a lid member 9, and the stepped portion is provided. The inner surface of the end wall 9b of the lid member 9 is brought into contact with the outer surface of the stepped wall 10a of the portion 10. And the length of the overlapping part 11 which the end part wall 9b of the cover member 9 and the step part raising wall 10a of the tank 7 contact according to the lamination | stacking height of the element 4 can be changed.
[Selection] Figure 2

Description

  The present invention relates to a brazing structure for a tube plateless heat exchanger without a tube plate.

  As shown in FIGS. 5 and 6, the conventional tube plateless heat exchanger has a pair of groove-type plates 2 and 3 fitted to each other so that the groove bottoms face each other and the side walls 2a and 3a are fitted to each other. 4 is configured. The grooved plates 2 and 3 have bulged portions 1 protruding in the thickness direction at both longitudinal ends. A large number of elements 4 are stacked so as to come into contact with each other at the bulging portion 1 to form a core 5. Then, as shown in FIG. 5, a casing 6 is fitted on the outer periphery of the core 5 (usually divided into two vertically), and a pair of tanks 7 are fitted to both ends of the casing 6 in the longitudinal direction. And between the contact parts of each component is integrally brazed.

The conventional tube plateless heat exchanger brazing structure has the following problems.
When a pair of groove-type plates 2 and 3 are fitted to each other to form an element 4 and a large number of the elements 4 are stacked to form a core 5, the dimensional accuracy in the bulging portion 1 of the element 4 allows The stacking height may be different. When the stacking height is higher than the opening of the tank 7, a gap 14 is generated between the casing 6 and the tank 7 as shown in FIG. 6 (A) (note that the casing 6 is divided into upper and lower parts, Since they fit together, the casing follows the height of the core 5). Further, when the stacking height of the core 5 is lower than that of the tank 7, a gap 14 is generated between the casing 6 and the core 5 as shown in FIG. At this time, the casing follows the height of the tank 7.
The gap 14 is also reduced in height by the melting amount of the brazing material provided on the outer surface of each element 4 and the gap 14 is further increased.

When such a gap 14 occurs, the airtightness and liquid tightness between the core 5, the casing 6, and the tank 7 are lost, and the first fluid that circulates in the casing 6 and the second fluid that circulates in the tank 7. Leakage occurs in either one or more.
Therefore, an object of the present invention is to prevent the generation of a gap that causes the fluid to flow out.

According to the first aspect of the present invention, a pair of groove-type plates (2) (3) each having a bulge portion (1) projecting in the thickness direction at both ends in the longitudinal direction is formed into a shallow groove shape. The groove bottoms face each other, and both side walls (2a) and (3a) are fitted together to form an element (4),
A core (5) is configured by laminating a number of elements (4) so as to contact each other at the bulging portion (1),
A casing (6) is fitted on the outer periphery of the core (5), a pair of tanks (7) are fitted on both ends of the casing (6) in the longitudinal direction, and the contact portions of the parts are integrally brazed. In the brazed structure of the tube plateless heat exchanger
The casing (6) is formed in a groove-shaped main body member (8) having a high side wall (8a) having a high side wall, a low side wall (9a) having a low side wall, and both longitudinal ends thereof. A lid member (9) having an end wall (9b) formed on the outer surface of the edge of the high side wall (8a) of the main body member (8), and the low side wall (9a) of the lid member (9) And the inner surface of the end wall (9b) is fitted,
The tank (7) has a stepped portion (10) that bulges outward at one end in the height direction of the opening,
The outer periphery of the opening of the tank (7) is fitted to the inner surfaces of the main body member (8) and the lid member (9), and on the outer surface of the stepped wall (10a) of the stepped portion (10). The inner surface of the end wall (9b) of the lid member (9) is in contact,
The length of the overlapping portion (11) where the end wall (9b) of the lid member (9) and the stepped up wall (10a) of the tank (7) are in contact with each other depending on the stacking height of the element (4) It is the brazing structure of the tube plateless heat exchanger comprised so that can be changed.

In the brazing structure of the present invention, the outer periphery of the opening of the tank 7 is fitted to the inner surfaces of the main body member 8 and the lid member 9, and the lid member 9 is attached to the outer surface of the stepped wall 10 a of the stepped portion 10. The length of the overlapping portion 11 where the inner surface of the end wall 9b contacts and the end wall 9b of the lid member 9 and the stepped wall 10a of the tank 7 contact according to the stacking height of the elements 4 is: As shown in FIG. 3 and FIG. 4, it can be changed.
Therefore, even if a change occurs in the height of the core 5 based on the dimensional error in the bulging portions 1 of the multiple elements 4 or the melting of the brazing material at the time of brazing, the lid member 9 can be moved up and down following the change. it can. That is, the inner surface of the end wall 9b of the lid member 9 and the stepped rising wall 10a of the stepped portion 10 of the tank 7 come into contact with each other, and the overlapping portion 11 changes to change the opening of the tank 7 and the casing 6 It is possible to completely absorb the gap between the heat exchanger and the air tightness and liquid tightness of the heat exchanger. Thereby, a highly reliable heat exchanger can be provided. In addition, the casing 6 and the core 5 follow the height of the core 5, and the lid member 9 moves up and down with respect to the main body member 8 to come into contact with each other without a gap.

The disassembled perspective view of the tube plateless heat exchanger of this invention. The longitudinal cross-sectional view which shows the assembly state of the heat exchanger. The III section enlarged view of FIG. Fig. 4 is a cross-sectional view taken along arrow IV-IV in Fig. 2. The partially broken front view of the conventional tube plateless heat exchanger. The VI section enlarged view of FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
This heat exchanger is optimal for an EGR cooler as an example.
The heat exchanger has a core 5 made of a laminate of a large number of elements 4 and a pair of tanks 7. As shown in FIG. 1, the element 4 constituting the core 5 is composed of a fitting body of a pair of groove-type plates 2 and 3, and each groove-type plate 2 and 3 is bent into a shallow groove shape, and its length It has the bulging part 1 which protruded in the thickness direction at the direction both ends. And the element 4 is comprised by mutually fitting those both side walls 2a and 3a so that the groove bottom of a pair of groove type plates 2 and 3 may oppose. Note that a brazing material is previously applied, placed, or coated on the outer surface with which the element 4 comes into contact. Then, a large number of elements 4 are stacked so as to be in contact with each other at the bulging portion 1 to constitute the core 5.

  Next, the casing 6 includes a main body member 8 and a lid member 9. The main body member 8 is formed in a groove shape having high side walls 8a on both side walls. The lid member 9 has a low side wall 9a having low side walls and end walls 9b formed at both longitudinal ends thereof. In this example, the low side wall 9a and the end wall 9b are formed at the same height, and the low side wall 9a, the end wall 9b, and the ceiling are integrally formed by press forming. A dimple 15 projects from the inner surface side of the lid member 9 and a dimple (not shown) projects from the inner surface of the bottom of the main body member 8. In addition, dimples 15 are also projected on the outer surface sides of the groove-type plates 2 and 3 so that the dimples 15 are in contact with each other. Further, protrusions 16 projecting toward the inner surface are formed at both longitudinal end positions of the low side wall 9a of the lid member 9 and the high side wall 8a of the main body member 8, and a stopper surface on which the core 5 and the tank 7 abut against the stepped portion is provided. Form.

  Next, the pair of tanks 7 are formed with stepped portions 10 that bulge outward only at one end in the height direction of the opening. Except for the stepped portion 10, both sides and the lower surface of the tank 7 are aligned with both the high side walls 8 a and the inner periphery of the bottom surface of the main body member 8 in each figure. Further, the height of the tank 7 includes the stepped portion 10 and is slightly lower than the inner peripheral height of the main body member 8, which may be the same. In this example, the main body member 8 is provided with a pair of cooling water inlets / outlets 12.

(Function)
Next, the method for brazing the tube plateless heat exchanger of the present invention will be described.
First, a pair of groove-type plates 2 and 3 in which a brazing material is disposed at contact portions that are in contact with each other are fitted with their groove bottoms facing each other, and inner fins are disposed inside. Such elements 4 are laminated to constitute the core 5.
Next, the core 5 is inserted into the main body member 8 of the casing 6. At the same time, the outer peripheral surface of the tank 7 is fitted to the inner peripheral surfaces of both end portions of the main body member 8. At this time, the core 5 and the tank 7 abut against both sides of the protrusion 16. Next, the lid member 9 is fitted on the outer periphery thereof. At this time, the inner surface of the low side wall 9 a of the lid member 9 is fitted to the upper edge of the high side wall 8 a and the end wall 9 b is fitted to the rising wall 10 a of the stepped portion 10 of the tank 7. . 2 and 3, both end portions of the lid member 9 come into contact with the element 4 at the uppermost position of the core 5.

At this time, as shown in FIG. 3, a slight gap is formed between the upper surface of the stepped portion 10 and the inner surface of the ceiling portion of the lid member 9. At the same time, a gap 13 is formed between the tip of the low side wall 9 a of the lid member 9 and the stepped portion of the tank 7. However, the lid member 9 and the core 5 are in contact with each other and there is no gap between them. At the same time, the lid member 9 and the tank 7 are brought into contact with each other on the rising surface, and no gap is formed there.
In this state, if the thickness of the laminated body of the elements 4 is slightly lower than the position in FIG. 3, the lid member 9 is lowered by that amount, and the steps of the low side wall 9 a and the tank 7 are performed. The gap 13 with the part is only reduced. On the other hand, when the top surface height of the uppermost element 4 is higher than in the case of FIG. 3, the lid member 9 moves upward and the gap 13 between the low side wall 9 a and the tank 7 is only increased. However, both are in contact with each other at the rising surface, and there is no gap through which the fluid leaks.

  That is, in any case, there is no gap between the laminated body of the elements 4 and the lid member 9. At the same time, there is no gap between the stepped wall 10a of the tank 7 and the inner surface of the lid member 9. In such an assembled state, the whole is inserted into a high-temperature furnace and integrally brazed and fixed to complete the heat exchanger.

  When this heat exchanger is used as an EGR cooler, high-temperature exhaust gas is led from the tank 7 on one side in FIG. 2, circulates in each element 4, and is led out from the other tank 7 to the outside. Then, cooling water flows from one cooling water inlet / outlet 12 provided in the casing 6, flows through the outer periphery of each element 4, and flows out from the other cooling water inlet / outlet 12. And heat exchange is performed between the cooling water and exhaust gas, and exhaust gas is cooled.

1 bulge 2 groove plate
2a Side wall 3 Groove plate
3a Side wall 4 Element 5 Core

6 Casing 7 Tank 8 Body member
8a High side wall 9 Lid member
9a Low side wall
9b end wall
10 Stepped part
10a Stepped up wall

11 Overlap
12 Cooling water inlet / outlet
13 Clearance
14 Clearance
15 dimples
16 ridges

Claims (1)

A pair of groove-type plates (2) and (3), each of which is bent into a shallow groove shape and has a bulging portion (1) projecting in the thickness direction at both ends in the longitudinal direction, with the groove bottoms facing each other, Elements (4) are constructed by fitting the walls (2a) (3a) together,
A core (5) is configured by laminating a number of elements (4) so as to contact each other at the bulging portion (1),
A casing (6) is fitted on the outer periphery of the core (5), a pair of tanks (7) are fitted on both ends of the casing (6) in the longitudinal direction, and the contact portions of the parts are integrally brazed. In the brazed structure of the tube plateless heat exchanger
The casing (6) is formed in a groove-shaped main body member (8) having a high side wall (8a) having a high side wall, a low side wall (9a) having a low side wall, and both longitudinal ends thereof. A lid member (9) having an end wall (9b) formed on the outer surface of the edge of the high side wall (8a) of the main body member (8), and the low side wall (9a) of the lid member (9) And the inner surface of the end wall (9b) is fitted,
The tank (7) has a stepped portion (10) that bulges outward at one end in the height direction of the opening,
The outer periphery of the opening of the tank (7) is fitted to the inner surfaces of the main body member (8) and the lid member (9), and on the outer surface of the stepped wall (10a) of the stepped portion (10). The inner surface of the end wall (9b) of the lid member (9) is in contact,
The length of the overlapping portion (11) where the end wall (9b) of the lid member (9) and the stepped up wall (10a) of the tank (7) are in contact with each other depending on the stacking height of the element (4) Brazing structure of tube plateless heat exchanger configured so that can be changed.

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