JP6603512B2 - Heat exchanger and method for manufacturing the core - Google Patents

Description

  The present invention relates to a heat exchanger used in a radiator for an automobile as an example and a method for manufacturing the core thereof, and particularly relates to an easily manufactured and highly pressure resistant device.

In the heat exchanger described in Patent Document 1 below, tube insertion holes that are flat on the plane of the elongated tube plate are arranged in parallel at regular intervals. At the same time, ribs are projected between the tube insertion holes, and oblique reinforcing portions are provided at both ends in the longitudinal direction of the ribs. And a groove part is formed in the outer periphery of a tube plate, the periphery of a tank main body is fitted there, and the claw part provided in the side wall of the groove part is crimped and fixed.
Next, the heat exchanger described in Patent Document 2 below is described in Patent Document 1 in that ribs are arranged at two locations in the longitudinal direction separated in the width direction of the tube plate to facilitate the formation of the tube plate. ing.

Japanese Utility Model Publication No. 3-46776 JP 2008-32384 A

In the heat exchanger described in Patent Document 1, ribs are provided between tube insertion holes, reinforcing portions are provided at both ends of the ribs, and the reinforcing portions are recessed in an annular groove. Thereby, the pressure resistance is improved, but there is a drawback that it is extremely difficult to form the tube plate.
Next, the invention described in Patent Document 2 has a drawback that the pressure resistance is weak because the ribs arranged between the flat tubes are arranged separately in the width direction.
Then, this invention makes it a subject to provide the manufacturing method of the heat exchanger which the press molding of a tube plate is easy, and has high pressure resistance, and its core.

According to the first aspect of the present invention, the flat tubes 1 are arranged in parallel at regular intervals to constitute the core 3, and both end portions of the flat tubes 1 are respectively inserted into the tube plates 4. opening of the tank body 5 is connected,
The tube plate 4 is made of a press-formed body of a metal plate, and has a flat surface 6 elongated in the parallel direction of the flat tube 1 and a groove portion 7 formed on the outer periphery thereof.
The plane 6 is formed by alternately forming flat first planes 6a and second planes 6b having different heights in the longitudinal direction of the flat tube, and the first plane 6a and the second plane 6b have major axes in the width direction, respectively. A tube insertion hole 8 is formed,
In the manufacturing method of the core of the heat exchanger in which the end of the flat tube 1 is inserted and fixed in each tube insertion hole 8 ,
A large number of flat tubes 1 of the same length and corrugated fins 2 are alternately arranged in parallel to form the core 3, and the end surfaces of the flat tubes 1 are arranged flush with each other so that the cores 3 are arranged in the parallel direction. In the compressed state, the distal end portion of the first group of flat tubes 1, which is half of the whole, is inserted into the tube insertion hole 8 of the first plane 6 a, and then the remaining distal end portions of the second group of flat tubes 1 are inserted into the first tube 6. An assembly step of inserting the flat tube 1 into the tube insertion hole 8 of the two flat surfaces 6b and aligning the tips of the flat tubes 1 in the inserted state;
Brazing the parts of the core 3 together in the assembled state;
The manufacturing method of the core of the heat exchanger which comprises this.

According to the second aspect of the present invention, the flat tubes 1 are arranged in parallel at regular intervals to form the core 3, and both end portions of the flat tubes 1 are inserted into the tube plates 4, respectively. In the heat exchanger in which the opening of the tank body 5 is connected,
The tube plate 4 is made of a press-formed body of a metal plate, and has a flat surface 6 elongated in the parallel direction of the flat tube 1 and a groove portion 7 formed on the outer periphery thereof.
The plane 6 is formed by alternately forming flat first planes 6a and second planes 6b having different heights in the longitudinal direction of the flat tube, and the first plane 6a and the second plane 6b have major axes in the width direction, respectively. A tube insertion hole 8 is formed,
The end of the flat tube 1 is inserted and fixed in each tube insertion hole 8,
In the heat exchanger, the first plane 6a and the second plane 6b are arranged in a staggered manner in the longitudinal direction and the width direction of the tube plate 4.

In the heat exchanger according to claim 1, flat first planes 6 a and second planes 6 b having different heights in the longitudinal direction are alternately formed, and the first plane 6 a and the second plane 6 b are respectively in the width direction. A tube insertion hole 8 having a long axis is formed. Therefore, the heat exchanger is easy to manufacture and has high pressure resistance. That is, since the first flat surfaces 6a and the second flat surfaces 6b that are flat and different in height are alternately formed, it is easy to form the tube plate, and the longitudinal section in the longitudinal direction has a large section modulus. Deformation is effectively prevented and pressure resistance is high.
And as a manufacturing method of the core of the heat exchanger, in the compressed state in which the end faces of the flat tubes 1 are arranged flush, the tip of the flat tube of the first group, which is half of the whole, is inserted into the tube of the first flat surface 6a. An assembly step of inserting the distal ends of the remaining flat tubes of the second group into the tube insertion holes of the second plane 6b, and aligning the distal ends of the respective flat tubes in the inserted state, And brazing the parts of the core together in the assembled state.
According to this method, it is possible to easily insert the flat tubes into the tube insertion holes having different planes, and manufacture a heat exchanger core having high mass productivity.

In the heat exchanger according to the second aspect of the present invention, flat first planes 6a and second planes 6b having different heights in the longitudinal direction are alternately formed, and the first plane 6a and the second plane 6b are respectively formed. A tube insertion hole 8 having a long axis in the width direction is formed. Therefore, the heat exchanger is easy to manufacture and has high pressure resistance. That is, since the first flat surfaces 6a and the second flat surfaces 6b that are flat and different in height are alternately formed, it is easy to form the tube plate, and the longitudinal section in the longitudinal direction has a large section modulus. Deformation is effectively prevented and pressure resistance is high.
Then, since the first plane 6a in the longitudinal direction and the width direction of the tube plate and the second plane 6b are arranged in a zigzag pattern, pressure resistance even higher, and high reliability heat exchanger.

It is a principal part longitudinal cross-sectional view of the tube plate 4 used for the heat exchanger of this invention, Comprising: The II arrow directional view of FIG. II-II arrow line view of FIG. The principal part cross-sectional view of the same heat exchanger. The longitudinal cross-sectional view which shows the state which penetrated the flat tube 1 in the tube plate 4 of FIG. FIG. The principal part perspective view of 2nd Example of this invention. The principal part perspective view of the 3rd Example. The principal part cross-sectional view of the same 4th Example. FIG. Explanatory drawing which shows the procedure which penetrates the core 3 which consists of the flat tube 1 and the fin 2 in each tube penetration hole 8 of the tube plate 4. FIG.

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

This heat exchanger is used as a radiator for an automobile as an example. As shown in FIG. 5, a large number of flat tubes 1 are arranged in parallel at regular intervals, and corrugated fins (not shown in the figure) are arranged between the flat tubes 1. To form the core 3. Then, both ends of the flat tube 1 are inserted into the tube insertion holes of the tube plate 4.
The tube plate 4 is made of a metal plate that is elongated in the parallel direction of the flat tubes 1, and flat first planes 6 a and second planes 6 b having different heights are alternately formed on the plane 6. A longitudinal section in the direction is formed in a trapezoidal wave shape. The planes of the first planes 6a and the second planes 6b are formed flush with each other. And as shown in FIG. 4, the level | step difference of height H arises between the 1st plane 6a and the 2nd plane 6b.

Further, as shown in FIG. 1, a tube insertion hole 8 is formed at the center of the first plane 6a and the second plane 6b, and the major axis thereof coincides with the width direction.
Further, a burring portion 9 that slightly protrudes toward the tank is formed at the hole edge of each tube insertion hole 8. Then, as shown in FIG. 10, both ends of the core 3 in which the flat tubes 1 and the fins 2 are alternately arranged are inserted into the tube insertion holes 8 of the tube plate 4. At this time, the length of each flat tube 1 is the same, and the edge part height is the same. Each flat tube 1 is inserted into the tube insertion hole 8 of the tube plate 4 in a state where the flat tube 1 and the fin 2 are compressed by the pressing force P. At this time, each half of the flat tubes 1 is first inserted into the tube insertion holes 8 of the first plane 6a, and then the top of each of the other half of the flat tubes 1 adjacent thereto is the tube insertion hole 8 of the second plane 6b. Is inserted.

Then, as shown in FIG.4 and FIG.5, the tube end 1a of each flat tube 1 is maintained at the same height. An annular groove 7 is formed on the periphery of the tube plate 4. And the crimping nail | claw 12 is integrally arrange | positioned at the fixed space | interval in the outer side wall part.
The parts assembled in this way are integrally brazed and fixed in a high-temperature furnace to form an assembly of the flat tube 1, fins 2 and tube plate 4. Next, as shown in FIGS. 3 and 5, the opening edge of the tank body 5 is inserted into the groove portion 7 of the tube plate 4 via the O-ring 13, and the tank body 5 is pressed against the groove portion 7 of the tube plate 4. The caulking claw 12 is caulked and fixed to the small flange portion on the outer peripheral edge of the tank body 5 to complete the heat exchanger.

In this example, the tank body 5 made of synthetic resin is press-fitted into the groove portion 7 of the tube plate 4 through the O-ring 13, but the metal tank body 5 is fitted into the narrower groove portion 7 of the tube plate 4. The two may be brazed together.
Further, in this example, the opening end of the tank body 5 has a small flange portion that is widened outwardly inserted into the groove portion 7, and its leg height coincides with the second plane 6 b including the O-ring 13. That is, the neck of the cross section of the tank body 5 coincides with the second plane 6b.
In addition, you may form the leg part of the tank main body 5 so that the neck part may contact | abut to the 1st plane 6a and the 2nd plane 6b, respectively. That is, in FIG. 5, the necks of the legs of the tank body 5 may be alternately brought into contact with the edge of the second plane 6 b and the edge of the first plane 6 a along the longitudinal direction of the tube plate 4. Good.

Next, FIG. 6 shows a second embodiment of the present invention, and this tube plate 4 is obtained by inserting the flat tubes 1 into the tube insertion holes 8 in two rows.
That is, the width of the tube plate 4 is twice as large as that in FIG. 5, and the first plane 6 a and the second plane 6 b are alternately formed in a trapezoidal longitudinal cross section on the plane 6 of the tube plate 4. And a pair of tube penetration hole 8 is formed on the center line of each 1st plane 6a and the 2nd plane 6b, and flat tube 1 is penetrated there.

  Next, FIG. 7 shows a third embodiment of the present invention. In this example, two flat tubes 1 are inserted into each of the first plane 6a and the second plane 6b in the longitudinal direction of the tube plate 4, respectively. Yes.

  Next, FIGS. 8 and 9 show a fourth embodiment of the present invention. In this example, the first plane 6a and the second plane 6b are arranged in a staggered manner in the longitudinal direction and the width direction of the tube plate 4. FIG. Yes. And the flat tube 1 is penetrated by each 1st plane 6a, 2nd plane 6b. In this example, the width-side inclined portion 11a is formed at the boundary between the first plane 6a having a different height in the width direction of the tube plate 4 and the second plane 6b, and the height of the tube plate 4 having a different height in the longitudinal direction is different. An inclined portion 11 is provided at the boundary between the first plane 6a and the second plane 6b.

[Modification]
In the embodiment of FIG. 6, the flat tubes 1 are inserted in two rows in the width direction of the tube plate 4, but it is also possible to have three or more rows.
Further, in the embodiment of FIG. 7, a pair of flat tubes 1 are inserted through the first plane 6a and the second plane 6b, respectively, but three or more flat tubes 1 are further inserted into the first plane 6a and the second plane 6b. It may be inserted.
In each embodiment, the flat tube 1, the tube plate 4, and the tank body 5 are arranged in the same vertical direction as the gravity direction, but they may be arranged in the horizontal direction.
Moreover, although the said Example described the radiator for motor vehicles, it can also apply to an intercooler, an EGR cooler, and other heat exchangers.

1 flat tube 1a tube end 2 fin 3 core 4 tube plate 5 tank body 6 plane 6a first plane 6b second plane

7 Groove portion 8 Tube insertion hole 9 Burring processing portion 10 Top portion 11 Inclined portion 11a Wide side inclined portion 12 Caulking claw 13 O-ring P Pressing force

Claims (2)

The flat tubes (1) are arranged in parallel at regular intervals to form a core (3), and both ends of each flat tube (1) are inserted into the tube plate (4), and the outer periphery of the tube plate (4) opening of the tank body (5) is connected,
The tube plate (4) is made of a metal plate press-molded body, and has a flat surface (6) elongated in the parallel direction of the flat tube (1) and a groove (7) formed on the outer periphery thereof.
The plane (6) is formed by alternately forming flat first planes (6a) and second planes (6b) having different heights in the longitudinal direction of the flat tube, and the first plane (6a) and the second plane (6b). ) And tube insertion holes (8) each having a long axis in the width direction,
In the manufacturing method of the core of the heat exchanger in which the end of the flat tube (1) is inserted and fixed in each tube insertion hole (8) ,
A number of flat tubes (1) of the same length and corrugated fins (2) are alternately arranged in parallel to form a core (3), and the end surfaces of the flat tubes (1) are arranged flush with each other. With the core (3) compressed in the parallel direction, the tip of the first group of flat tubes (1), which is half of the whole, is inserted into the tube insertion hole (8) of the first plane (6a), Next, the tip of the remaining flat tube (1) of the second group is inserted into the tube insertion hole (8) of the second plane (6b), and the tip of each flat tube (1) is faced in the inserted state. Assembly process to align to one,
Brazing the parts of the core (3) together in the assembled state;
The manufacturing method of the core of the heat exchanger which comprises this . The flat tubes (1) are arranged in parallel at regular intervals to form a core (3), and both ends of each flat tube (1) are inserted into the tube plate (4), and the outer periphery of the tube plate (4) In the heat exchanger in which the opening of the tank body (5) is connected,
The tube plate (4) is made of a metal plate press-molded body, and has a flat surface (6) elongated in the parallel direction of the flat tube (1) and a groove (7) formed on the outer periphery thereof.
The plane (6) is formed by alternately forming flat first planes (6a) and second planes (6b) having different heights in the longitudinal direction of the flat tube, and the first plane (6a) and the second plane (6b). ) And tube insertion holes (8) each having a long axis in the width direction,
The end of the flat tube (1) is inserted and fixed in each tube insertion hole (8) ,
A heat exchanger in which the first plane (6a) and the second plane (6b) are arranged in a staggered manner in the longitudinal direction and the width direction of the tube plate (4).

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