JP6959156B2 - Connection structure of heat exchanger tank - Google Patents

Description

The present invention relates to a connection structure between a tank body and an open end thereof with a plate to be fitted via a seal ring.

The tightening coupling device described in Patent Document 1 below includes a tank body and a header plate (corresponding to a second member (tube plate) of Patent Document 1) for fitting the open end thereof, and the tank body has the opening. The outer circumference of the end is projected like a flange. Then, the flange portion is fitted into the annular groove of the header plate via the packing. The header plate is intermittently provided with a large number of slits parallel to the flange at a position separated from the edge of the annular groove by a predetermined distance, and the edge adjacent to the slit is plastically deformed parallel to the flange. Therefore, a U-shaped locking claw in a plan view is formed. Then, the edge of the locking claw on the slit side is locked to the flat surface of the flange portion.

As an application example, there are connection structures shown in FIGS. 9 to 11.
In this application example, instead of the header plate, a casing having a cylindrical plate 3 whose end is fitted on the outer periphery of the tank body 2a is provided. Then, a recessed portion 20 elongated in the circumferential direction is intermittently formed on the side surface of the flange portion 4 of the tank body. Further, slits 5 are intermittently provided at the ends of the plates constituting the casing, and the ends adjacent to the slits are plastically deformed in the direction opposite to the projecting direction of the flange to form the locking claws 6. The locking claw 6 is press-fitted into the recess 20 of the tank body 2a.

Special Publication No. 58-4206 U.S. Pat. No. 4,881,595

In the case of the tubular plate 3 constituting the casing of the connection structure shown in FIGS. 9 to 11, which is an application example of the invention described in Patent Document 1, and the tank body 2a, the locking claw 6 is recessed 20. When press-fitting into the inside, the ends of the locking claws ride on the R curved surfaces 21 formed at both ends in the longitudinal direction of the recessed portion 20, and stress concentration occurs there with respect to the internal pressure and vibration of the tank. Fatigue cracks 22 may occur.

Therefore, it is an object of the present invention to provide a highly reliable connection structure having high pressure resistance and earthquake resistance because cracks are unlikely to occur in the locking claws even when internal pressure and vibration act on the tank.

The present invention according to claim 1 is formed in a box shape through which a first fluid flows, and the bottom of the box is opened to form an open end 1 on the outer surface side of the open end 1. The tank body 2 on which the flange portion 4 is projected and the tank body 2
The flange portion 4 of the tank body 2 has an annular groove 9a on the inner surface side to which the flange portion 4 is fitted via the seal ring 10, and a plurality of slits 5 are intermittently spaced apart from each other in the circumferential direction on the outer periphery of the end portion on the outer surface side. The plate 3 on which the
The end portions of the plate 3 adjacent to each slit 5 are plastically deformed in an arc shape opposite to the projecting direction of the flange portion 4 and parallel to the circumferential direction of the flange portion 4, and a plurality of locking claws 6 are formed. Is formed, and in the connection structure of the heat exchanger tank in which the arcuate edge 6a of the locking claw 6 on the slit 5 side is locked to the locking surface 4a of the flange portion 4.
In the tank body 2, a plurality of projecting portions 8 are formed on the outer surface side of the flange portion 4 intermittently in the circumferential direction in parallel with the flange portion 4 via a groove portion 7 parallel to the flange portion 4. An end portion adjacent to each of the slits 5 is press-fitted between the ends of the projecting portions 8 and 8 facing each other in the circumferential direction, and the plurality of plastically deformed locking claws 6 are provided therein. The circumferential length of the slit 5 is shorter than the circumferential length of the groove 7, and is a connection structure for the heat exchanger tank.

The present invention according to claim 2 is the connection structure for the heat exchanger tank according to claim 1, wherein the groove portion 7 is formed over the entire circumference of the outer circumference of the tank body 2.

In the connection structure of the present invention, since the groove portion 7 is formed in the tank body 2, the locking claws are formed in the race track-shaped recessed portion 20 provided on the side surface of the flange having the conventional structure as shown in FIGS. 9 to 11. There is no possibility that the edge of the locking claw will ride on the R curved surface 21 at the end in the longitudinal direction of the recessed portion, as in the case of press-fitting. Therefore, it is possible to prevent interference caused at the end of the locking claw due to riding and stress concentration at the base of the locking claw caused by fluid pressure and vibration, and it is possible to provide a highly reliable connection structure.
Further, when the groove portion 7 extends over the entire circumference of the outer circumference of the tank body 2, when the groove portion 7 is formed by cutting, the processing can be continuously performed without interruption, so that the tank can be processed. The productivity of the main body 2 is improved.

The main part perspective view of the connection structure of the heat exchanger tank of this invention. The main part perspective view of the tank body 2 used for the same structure. A front view of the main part of the tank body 2 and a front view of the main part showing a state in which the plate 3 is fitted to the end of the tank body 2. It is a perspective view of the main part of the connection part between the tank main body 2 and the plate 3, (A) shows the state before the deformation of the locking claw 6, and (B) shows the state after the deformation. (A) is a vertical cross-sectional view showing a state before the tank body 2 is fitted to the plate 3, and (B) is a vertical cross-sectional view showing a state in which the locking claw 6 is plastically deformed after the fitting. An exploded perspective view showing the entire heat exchanger having the same connection structure. The perspective view which shows the assembled state. FIG. 5 is a cross-sectional view of a main part of a connection structure of a heat exchanger tank according to a second embodiment of the present invention. FIG. 3 is a perspective view of a main part of the tank body 2a used for the connection structure of the application example of the conventional example. The front explanatory view which shows the state which the plate main body 3a is fitted to the tank main body 2a. A perspective view of the same main part.

Next, an embodiment of the present invention will be described with reference to the drawings.
The present invention is a connection structure between a plate and a tank body applied to a charge air cooler as an example of a heat exchanger. That is, as shown in FIG. 6, a core 13 of a heat exchanger is formed by a laminated body of flat tubes 12, and a casing made of a cylindrically formed plate 3 is fitted on the outer periphery of the core 13, and the plate 3 is fitted. A pair of brackets 9 are attached to the inner surfaces of the openings at both ends in the flow direction of the exhaust gas (first fluid), and an annular groove 9a is formed between the brackets 9 and the plate 3. Then, as shown in FIG. 5, a flange portion 4 projecting from the opening end 1 of the tank body 2 is fitted into the annular groove 9a via the seal ring 10, and the end portion of the plate 3 and the flange portion of the tank body 2 are fitted. It is connected to No. 4 by caulking.

That is, in the plate 3 having the connection structure of the present invention, the bracket 9 is connected to the inner circumference of the end portion thereof, and the plate and the bracket 9 form an annular groove 9a. Then, the flange portion 4 of the tank body 2 is press-fitted into the annular groove 9a. In that state, the edge portion adjacent to the slit 5 (FIG. 1) provided at the open end of the plate 3 is plastically deformed in the direction opposite to the protruding direction of the flange portion 4 to form the locking claw 6, and the locking claw 6 is formed. The arcuate edge 6a of the claw 6 is locked to the locking surface 4a of the flange portion 4.

As shown in FIGS. 2 and 3A, the tank body 2 is formed in a box shape and has an open end 1 in which the bottom of the box is open. An annular flange portion 4 is projected from the outer periphery of the opening end 1. In FIG. 2, the flange portion 4 has a sealing surface 4b formed on the lower surface side and a locking surface 4a for the locking claw 6 formed on the upper surface side. Further, a projecting portion 8 facing the locking surface 4a and parallel to the flange portion 4 is intermittently integrally formed in the circumferential direction. The longitudinal end 8a of each projecting portion 8 has an arcuate horizontal cross section that curves outward. The end portion 8a may be an inclined surface or a concave curved surface. A groove portion 7 is formed in an annular shape between each of the projecting portions 8 and the flange portion 4.

Next, as shown in FIG. 6, the plate 3 constitutes a cylindrical casing by a plate body 3a having a U-shaped cross section and a side lid 3b fitted thereto. In the figure of the plate 3, slits 5 are intermittently formed in the circumferential direction at both upper and lower ends. As shown in FIG. 4A, the slit 5 is formed at a position close to both end edges of the plate 3.

Then, as shown in FIG. 4B, the end portion adjacent to the slit 5 is plastically deformed in the direction opposite to the protruding direction of the flange portion 4 of the tank body 2 by a caulking machine (not shown) to form a substantially arc shape in a plan view. Locking claw 6 is formed. As an example, the caulking machine comprises a press machine in which a plurality of claw forming portions are intermittently projected at positions adjacent to each slit of the plate 3. Then, the caulking machine is moved in the direction opposite to the projecting direction of the flange portion 4, the edge portions adjacent to the slits are pushed in, and at the same time, each locking claw 6 is formed. At this time, the edge portion adjacent to each slit 5 is press-fitted between the end portions 8a and 8a of each protruding portion 8. At this time, the pair of opposite end portions 8a, 8a serve as a guide for forming the locking claw 6, and the locking claw is accurately formed.

Then, the arcuate edge 6a of the locking claw 6 is adhered to the locking surface 4a of the flange portion 4.
At this time, a groove portion 7 is formed between the locking surface 4a and the projecting portion 8.
In forming the locking claw 6, as shown in FIG. 5B, a caulking machine (not shown) is used while press-fitting the flange portion 4 into the annular groove 9a between the plate 3 and the bracket 9 via the seal ring 10. Is moved from the outer surface side to the inner surface side of the plate 3, and the edge portion adjacent to the slit 5 is plastically deformed in an arc shape in a plan view.

Next, a heat exchanger having this connection structure will be described. In this heat exchanger, as shown in FIG. 6, the core 13 is formed by a laminated body of flat tubes 12. The flat tube is composed of a pair of groove-shaped plate fittings. Then, both ends in the longitudinal direction bulge outward in the thickness direction to form the expansion portion 23. A partition portion 16 and a dimple 17 are formed on the outer surface side of each flat tube 12.
Next, the outer circumference of the core 13 is fitted with a plate 3 composed of a plate body 3a and a side lid 3b. The plate 3 is formed in a tubular shape as a whole to form a casing.

Then, each part is assembled and brazed integrally between the parts in a high temperature furnace.
Next, as shown in FIGS. 5A and 5B, the seal ring 10 is fitted between the plate 3 and the bracket 9. Next, with the flange portion 4 of the tank body 2 press-fitted into the annular groove 9a and an external force applied in the direction of compressing the seal ring 10, the caulking machine is moved inward of the tank body 2 to lock the claws. Form 6. That is, an external force is applied to the edge portion of the plate 3 adjacent to each slit 5 in the direction opposite to the projecting direction of the flange portion 4, and the locking claw 6 is formed parallel to the flange portion 4. At this time, the locking claw 6 is formed in a substantially arc shape as shown in FIG. Further, the locking claw 6 is intermittently integrally formed on the outer periphery of the tank body 2 in the circumferential direction.
In this way, the heat exchanger shown in FIG. 7 is formed.

The cooling water 18 (second fluid) flows in from one of the pair of upper and lower cooling water pipes 14, and the cooling water 18 is supplied to the outer surface side of each flat tube 12 of the core 13. The cooling water 18 flows in a U shape from one side to the other side of the partition portion 16 in FIG.
Further, in FIG. 7, the exhaust gas 19 is guided from one exhaust gas pipe 15 to the other exhaust gas pipe 15, and the exhaust gas 19 circulates in each flat tube 12 of each core 13 and heats between the cooling water 18 and the exhaust gas 19. The exchange will take place.

A feature of this embodiment is that a groove 7 is formed in the tank body 2. As a result, as in the case where the locking claw is press-fitted into the race track-shaped recessed portion 20 provided on the side surface of the flange having the conventional structure as shown in FIGS. 9 to 11, the R curved surface at the end in the longitudinal direction of the recessed portion. There is no risk that the edge of the locking claw will ride on 21. Therefore, it is possible to prevent cracks and interference generated at the end of the locking claw due to riding, and stress concentration at the base of the locking claw caused by fluid pressure and vibration, and it is possible to provide a highly reliable connection structure.
Further, since the groove portion 7 extends over the entire circumference of the outer circumference of the tank body 2, when the groove portion 7 is formed by cutting, it is possible to continuously process the groove portion 7 without interruption, and the tank body 2 Productivity is improved.

Next, FIG. 8 is a cross-sectional view of a main part of the second embodiment of the present invention.
The connection structure of the heat exchanger tank is different from that of the first embodiment in that the plate 3 is a header plate in which the open end of the tank body 2 is fitted, and the end of the tube 24 is inserted into the tube insertion hole. And the insertion part is brazed.
In this embodiment, the outer peripheral edge of the plate 3 constituting the header plate has a raised side wall portion. A locking claw 6 is provided at the end of the side wall portion.

The present invention can be used as a connection structure for various heat exchangers such as radiators and charge air coolers. At this time, the plate 3 includes both a tube plate that covers the opening of the tank body and a tubular casing that has an annular groove on the inner circumference of the end.

1 Open end 2 Tank body 2a Tank body 3 Plate 3a Plate body 3b Side lid 4 Flange part 4a Locking surface 4b Sealing surface 5 Slit

6 Locking claw 6a Arc-shaped edge 7 Groove 8 Protruding part 8a End 9 Bracket 9a Circular groove 10 Seal ring 12 Flat tube 13 Core

14 Cooling water pipe 15 Exhaust gas pipe 16 Partition 17 Dimple 18 Cooling water 19 Exhaust gas 20 Recessed part 21 R curved surface 22 Crack 23 Expanded part 24 Tube

Claims (2)

It is formed in a box shape through which the first fluid flows, and the bottom of the box is opened to form an open end (1), and a flange portion (4) is provided on the outer surface side of the open end (1). The protruding tank body (2) and
The flange portion (4) of the tank body (2) has an annular groove (9a) to be fitted via the seal ring (10) on the inner surface side, and is separated from the outer periphery of the end portion on the outer surface side in the circumferential direction. A plate (3) in which a plurality of slits (5) are formed intermittently is provided.
The end portion of the plate (3) adjacent to each slit (5) is plastically deformed into an arc shape in the direction opposite to the projecting direction of the flange portion (4) and parallel to the circumferential direction of the flange portion (4). A plurality of locking claws (6) are formed, and the arcuate edge (6a) of the locking claw (6) on the slit (5) side is the locking surface (4a) of the flange portion (4). In the connection structure of the heat exchanger tank locked to
The tank body (2) is intermittent in the circumferential direction parallel to the flange portion (4) via a groove portion (7) parallel to the flange portion (4) on the outer surface side of the flange portion (4). A plurality of projecting portions (8) are formed, and an end portion adjacent to each of the slits (5) is press-fitted between the ends of the projecting portions (8, 8) facing each other in the circumferential direction. The heat formed therein has a plurality of the locking claws (6) plastically deformed, and the length of the slit (5) in the circumferential direction is shorter than the length of the groove (7) in the circumferential direction. Connection structure of tank for exchanger. The connection structure for a heat exchanger tank according to claim 1, wherein the groove portion (7) is formed over the entire circumference of the outer circumference of the tank body (2).

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