JP3114230B2 - 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 laminated heat exchanger in which tubes forming fluid passages and radiating fins are alternately laminated.

[0002]

2. Description of the Related Art In some cases, a laminated type heat exchanger uses a split type header which can be easily processed and can improve productivity. The header for this split type is
As shown in FIG. 3, the plate header 101 is divided in the passage direction of the tube 100 (vertical direction in FIG. 3) and forms the inside (lower side in FIG. 3) and the tank header 10 forms the outside.
2, plate header 101 and tank header 102
And a cap 103 for closing the opening at both ends of the cylindrical body.

[0003]

However, in the split type header as described above, a step surface is formed on the outer periphery of the cylindrical body when the plate header 101 and the tank header 102 are assembled. Cap 1 to cover the outer circumference
4, a gap as shown in FIG. 4 is generated.
For this reason, when brazing is performed integrally in a furnace, the gap is not filled with the brazing material, and a brazing failure occurs between the cylindrical body and the cap 103, and the pressure resistance of the header is reduced. I was

[0004]

According to the present invention, a tube forming a fluid passage and radiating fins are alternately laminated, and headers are provided at both ends of each of the tubes. A plate header which is divided into two in the passage direction and forms an inside thereof, a tank header which forms an outside thereof, and a cap which closes both ends of a cylindrical body formed by combining the plate header and the tank header,
In the stacked heat exchanger, wherein the inner peripheral surface of the cylindrical body is formed of a smooth curved surface without a step, the cap is
A cover portion that is fitted on the inner peripheral side of the tubular body to close the tubular body, and the outer peripheral edge of the cap, in a state where the lid portion is fitted into the tubular body, the plate header side and the A pair of elastic pieces are provided integrally to press the outer periphery of the cylindrical body radially inward from the tank header side ,
The plate header and the tank header by elastic pieces
Are pressed in directions in which they contact each other .

[0005]

According to the present invention, in order to achieve the above object, tubes forming a fluid passage and radiating fins are alternately laminated, and headers are provided at both ends of each of the tubes. The header is divided into two parts in the direction of passage of the tube, and covers a plate header forming the inside and a tank header forming the outside, and closes both end openings of a cylindrical body formed by combining the plate header and the tank header. And a cap, and wherein the inner peripheral surface of the cylindrical body has a smooth curved surface with no steps, wherein the cap is fitted into the inner peripheral side of the cylindrical body and the cylindrical body is A lid closing the opening of the cap, and in a state where the lid is fitted into the cylinder at an outer peripheral edge of the cap, the outer side of the cylinder from the plate header side and the tank header side. A pair of elastic pieces which presses the radially inward is integrally provided, wherein this elastic piece
The plate header and the tank header contact each other
The pressing in the direction is a technical means.

[0006]

The laminated heat exchanger of the present invention having the above-mentioned structure has the following features.
This is a structure in which a cap is fitted on the inner peripheral side of the tubular body to close the opening of the tubular body formed by combining the plate header and the tank header. In this case, since the inner peripheral surface of the cylindrical body is formed by a relatively smooth curved surface, a gap is generated between the cap and the cylindrical body as in the case where the cap is placed on the outer periphery of the cylindrical body where a step surface occurs. And the cap can be fitted closely to the inner peripheral surface of the cylindrical body.

[0007] Further, the cylindrical body is provided with a pair of elastic pieces provided integrally with the cap in a state in which the lid portion of the cap is fitted, from the plate header side and the tank header side.
The outer periphery is pressed radially inward . This prevents the plate header and the tank header from separating from each other when the lid is inserted into the cylindrical body, and secures the adhesion at the joint surface between the plate header and the tank header.

[0008]

Next, an embodiment in which the laminated heat exchanger of the present invention is used as a refrigerant condenser will be described with reference to FIGS. FIG. 1 is a perspective view showing a configuration of a header of a refrigerant condenser,
FIG. 2 is an end sectional view of the header.

In the refrigerant condenser of the present embodiment, tubes 1 forming a refrigerant passage and corrugated fins 2 for heat radiation are alternately laminated, and headers 3 are arranged at both ends of each tube 1 and integrally brazed. Being manufactured.

The tube 1 is formed by extruding aluminum or by inserting an inner fin into the tube 1.
Each of them is integrally brazed, and each has a plurality of refrigerant passages (not shown) formed therein.
The corrugated fin 2 is a roller molded product obtained by processing a thin aluminum plate into a wave shape, and has a louver (not shown) for improving heat exchange efficiency on the surface.

The header 3 is divided into two parts in the direction of the passage of the tube 1 and has a plate header 4 forming an inside and a tank header 5 forming an outside, and a cylindrical body formed by combining the plate header 4 and the tank header 5. And a cap 7 for closing the opening at both ends. The plate header 4, the tank header 5, and the cap 7 are press-formed aluminum products clad with brazing material.

A long hole 8 (see FIG. 2) into which the end of each tube 1 is inserted is formed in the plate header 4 by burring. The tank header 5 has a semicircular cross section, and a step portion 5a that covers the end of the plate header 4 is formed at both ends in the circumferential direction. The end of the plate header 4 is combined with the inside of the step portion 5a to form a cylinder 6, and the inner peripheral surface of the cylinder 6 has no step at the joint between the plate header 4 and the tank header 5. It has a smooth curved surface. The outer wall of the tank header 5 is formed with a recess 5b that is recessed inside the tank header 5 at a predetermined position along the longitudinal direction of the cylindrical body 6 from the end face.

The cap 7 has a cover 7a formed at a constant depth, and the cover 7a is provided so as to be fitted on the inner peripheral side of the cylinder 6 to close the opening of the cylinder 6. (See FIG. 2). Therefore, the lid 7 a has an outer shape corresponding to the inner peripheral shape of the cylindrical body 6, and the outer peripheral surface thereof is formed by a smooth curved surface similarly to the inner peripheral surface of the cylindrical body 6.

The cap 7 is provided with a pair of claws 9 and 10 formed integrally with the cap 7 by press molding. The pair of claws 9 and 10 are provided on the outer peripheral edge of the cap 7 at positions opposing the plate header 4 and the tank header 5, and the plate 7 is fitted with the lid 7 a in the cylinder 6. It has elasticity so as to press the outer periphery of the header 4 and the outer periphery of the tank header 5 toward the inside of the cylindrical body 6.

At the tip of the claw 9 located on the tank header 5 side, a hook 9a protruding inward (to the claw 9 side) is formed. The hook 9a fits into the recess 5b provided in the tank header 5 and engages with the recess 5b when the cover 7a is fitted into the cylindrical body 6.

In the header 3 having the above structure, the cap 7 is attached after the plate header 4 and the tank header 5 are assembled. The cap 7 covers the opening of the cylinder 6 by fitting a lid 7 a to the inner peripheral side of the cylinder 6 formed by the plate header 4 and the tank header 5. in this case,
The inner peripheral surface of the cylindrical body 6 is formed with a smooth curved surface with no steps, and the outer peripheral surface of the lid 7a is also formed with a smooth curved surface corresponding to the inner peripheral shape of the cylindrical body 6. The lid 7a is fitted into the inner peripheral surface of the housing 6 without a gap.

The outer periphery of the cylindrical body 6 with the lid 7a fitted therein is radially inward from the plate header 4 side and the tank header 5 side by a pair of claws 9, 10 provided integrally with the cap 7. , The adhesion between the plate header 4 and the tank header 5 is ensured.

The cap 7 attached to the cylinder 6
The hook 9a formed at the tip of one of the claws 9 is engaged with the recess 5b provided in the tank header 5, so that the hook 9a is prevented from falling off from the cylinder 6. This allows
Cap 7 can be prevented from falling off during brazing.

As described above, according to the present embodiment, the cylindrical body 6 and the cap 7 can be assembled without any gap at the joint surface, so that good brazing properties can be obtained.
Therefore, as compared with the conventional case in which the cap 7 is covered on the outer periphery of the cylindrical body 6 and brazed, the high brazing resistance required for the refrigerant condenser can be secured by improving the brazing failure. .

[0020]

The laminated heat exchanger according to the present invention has a structure in which a cap is fitted on the inner peripheral side of a cylindrical body composed of a plate header and a tank header. Compared with the structure, the brazing failure between the cylinder and the cap is improved, and the pressure resistance of the header can be increased. Also, when the cap is fitted into the cylinder, the elastic piece provided integrally with the cap presses the outer periphery of the cylinder from the plate header side and the tank header side, thereby joining the plate header and the tank header. Surface adhesion can be ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a header of a refrigerant condenser.

FIG. 2 is an end sectional view of a header.

FIG. 3 is a perspective view showing a configuration of a header of a conventional laminated heat exchanger.

FIG. 4 is a cross-sectional view of a header for explaining a problem of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Corrugated fin 3 Header 4 Plate header 5 Tank header 6 Cylindrical body 7 Cap 9 Claw (elastic piece) 10 Claw (elastic piece)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 54-122457 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F28F 9/00-9/26

Claims (1)

(57) [Claims] 1. A tube forming a fluid passage and radiating fins are alternately stacked, and headers are provided at both ends of each of the tubes. An inner plate header, an outer tank header, and a cap for closing both ends of a cylindrical body formed by combining the plate header and the tank header, and the inner peripheral surface of the cylindrical body has a step. In the laminated heat exchanger configured with no smooth curved surface, the cap has a lid that is fitted on the inner peripheral side of the cylindrical body to close an opening of the cylindrical body, and is provided outside the cap. A pair of elastic pieces are integrally formed on the peripheral edge to press the outer periphery of the cylindrical body radially inward from the plate header side and the tank header side in a state where the lid portion is fitted into the cylindrical body. Provided, wherein the elastic piece Puretohe
And the tank header are pressed in the direction in which they contact each other.
A stacked heat exchanger characterized in that: