JPH0639255Y2 - Heat exchanger header structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a header structure of a parallel flow type heat exchanger in which a header pipe is divided into two in the tube connection direction.

(Prior Art) In a parallel flow type heat exchanger, a large number of flat tubes are laminated in parallel with each other via corrugated fins, and header pipes are connected to both ends of these flat tubes, respectively. Further, as the header pipe, a pipe divided into a tank and an end plate in the tube connecting direction is known, for example, those described in Japanese Patent Application No. 1-17546 and Japanese Patent Application Laid-Open No. 1-114697. is there.

According to the above heat exchanger, both the tank of the header pipe and the end plate are formed into curved surfaces that bulge outward, and the respective joint portions are fitted together to be integrally joined. In addition, the tank-side connecting portion is connected to the outside of the end plate-side connecting portion to improve the pressure resistance against the high-pressure refrigerant. In such a header pipe, several parts of both joints are previously brazed by argon welding in advance by spot welding and then integrally brazed.

According to the heat exchanger described above, the connecting portion of the tank and the end plate of the header pipe divided into two extends laterally and is joined by abutting against each other. Further, a claw portion is provided so as to project from the coupling portion of the end plate, and the claw portion is bent in a U shape to sandwich the tank side coupling portion together with the end plate side coupling portion. The joint is ensured, and the brazing is performed in a state of being sandwiched by the claws.

(Problems to be solved by the invention) However, in the above, since the joint portion on the end plate side is arranged inside the joint portion on the tank side to be joined, although it contributes to the reinforcement of the end plate, it is not suitable for brazing. Since both joints are temporarily attached by multiple spot welding in advance, axial tolerance is lost, and axial deformation of the tank or end plate due to thermal expansion during brazing is suppressed, and both are joined together. It may be twisted and deformed, and a gap may be created between both joints, so that the joints may not be securely joined. In addition, since spot welding is required in advance, there is a problem in that the appearance is poor, and it is troublesome and mass producibility is difficult.

Further, in the above, since both the joints extend laterally, the reinforcement of the end plate is insufficient, and the joint on the tank side is sandwiched by the claws. Similarly to the above, the axial tolerance of the tank and the end plate is lost, and there is a risk that the tank and the end plate will be twisted and deformed due to thermal expansion. There is also a problem that it is difficult to bend the claw portion into a proper U shape.

Therefore, an object of the present invention is to provide a header structure of a heat exchanger that does not suffer from adverse effects due to expansion heat while maintaining high pressure resistance of the end plate.

(Means for Solving the Problems) According to the present invention, header pipes are connected to both ends of a large number of tubes arranged in parallel with each other, and these header pipes have a semi-arcuate tank shape and a semi-arcuate shape in the tube connecting direction. Is a parallel flow type heat exchanger which is divided into two end plates and is integrally joined by arranging the joint portion of the end plate inside the joint portion of the tank. A holding piece for holding the other of the end plate and the tank from the outside is bent along the curved surface of the other part of the header part of the heat exchanger.

(Operation) When assembling the header pipe, place the end plate joint inside the tank joint, and hold the other end from the outside by holding the end plate and one outer peripheral surface of the tank with the holding piece. It will be installed in the assembled state.

Therefore, the high pressure resistance of the end plate is maintained, and since the outer peripheral surface of the other side is held in the joining direction by the holding piece, deformation due to thermal expansion is allowed during brazing, and the tank or end plate is It is possible to surely connect both connecting portions without causing twisting deformation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, in the heat exchanger 1 of the present embodiment, a large number of flat tubes 2 are laminated in parallel with each other via corrugated fins 3, and header pipes are provided at both ends of these flat tubes 2. 4 are connected to each other to form a parallel flow type. An inlet joint 5 is connected to the upper end side of one header pipe 4 and an outlet joint 6 is connected to the lower end side of the other header pipe 4, and a partition plate is provided in both header pipes 4 to connect both joints 5. The multi-pass structure in which the refrigerant flow path meanders several times between the positions 1 and 6 is provided.

As shown in FIGS. 1 and 2, the header pipe 4 has a structure in which a tank 7 and an end plate 11 are divided into two parts in the tube connecting direction, and a tube insertion hole 13 is provided in the end plate 11. There is. Both the tank 7 and the end plate 11 are formed in a curved surface that bulges outward and have a substantially elliptical cross section. In this embodiment, the radius of curvature of the curved surface of the tank is made larger than that of the end plate in order to increase the pressure resistance. Further, flat plate-shaped coupling portions 8 and 12 are formed at both ends of the tank 7 and the end plate 11 along the axial direction. The joint portion 8 of the tank 7 is turned to the side and then bent toward the end plate 11 side to form a step portion 9 inside, and the tip surface of the joint portion 12 on the end plate 11 side abuts on this step portion 9. They are joined together in this state, which makes positioning possible and improves the mountability. still,
Reference numeral 14 in the figure denotes a blind cap that closes the upper and lower openings of the header pipe 4.

Further, a plurality of holding pieces 10 are provided at equal intervals on both of the joining portions 8 on the tank side. In this embodiment, they are provided at six places at intervals of 60 cm, for example. In addition, the number may be 10 at 30 cm intervals, 4 at 90 cm intervals, or may be appropriately set. After the tank 7 and the end plate 11 are joined, these holding pieces 10 are formed on the outer peripheral surface of the end plate 11 by caulking from the state shown by the two-dot chain line in FIG. 2 to the state shown by the solid line. Are abutted along. Therefore, by these holding pieces 10, the end plate 11 is assembled in a state of being pressed toward the tank 7 side. As a result, at the time of brazing, both the tank 7 and the end plate 11 are allowed to move in the axial direction with each other due to thermal expansion, no twisting deformation occurs, and the tip surface of the end plate-side coupling portion 12 and the tank It is possible to perform reliable integral brazing without forming a gap between the side coupling portion 8 and the step portion 9. Further, spot welding is not required prior to brazing, appearance is not impaired, and it is possible to cope with mass productivity without labor. Furthermore, since each holding piece is integrally joined to the end plate by brazing, the pressure resistance of the pipe is further improved.

Next, another embodiment of the present invention will be described.

In this embodiment, as shown in FIGS. 4 to 6, a plurality of holding pieces 10 are provided on both coupling portions 12 of the end plate 11. As shown in FIG. 6, insertion holes 16 through which the holding pieces 10 are inserted are provided at positions corresponding to the holding pieces 10 of the tank 7. These insertion holes 16 are formed in a size larger in the axial direction than the width of the holding piece 10 and are configured to allow mutual deformation in the axial direction due to thermal expansion of the tank 7 and the end plate 11.

Then, in this embodiment, each holding piece 10 is inserted through the insertion hole 16 respectively.
When it comes into contact with the outer peripheral surface of the tank 7 by caulking from the above, the tank 7 is pressed to the end plate side as described above, and the same effect as described above is obtained.

Although the holding pieces are provided on either the tank or the end plate in each of the above-described embodiments, the present invention is not limited to this, and the holding pieces may be provided on both.

(Effects of the Invention) As described above, according to the present invention, since the other side is held by the holding piece from the outside, the pressure resistance performance of the end plate can be improved and the heat generated during brazing can be improved. Axial deformation of the tank and end plate due to expansion is allowed, and no gaps occur between the joints of both,
Reliable joining is possible. In addition, the conventional spot welding becomes unnecessary, the appearance is improved, and the mass productivity can be improved as the spot welding process is reduced.

[Brief description of drawings]

1 to 3 relate to a first embodiment of the present invention.
Fig. 1 is a front view of a header pipe, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, Fig. 3 is a front view of a heat exchanger, and Figs. 4 to 6 are second embodiments of the present invention. 4 is a front view showing the main part of the header pipe, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG. 6 is a view taken along the arrow VI in FIG. 1 ... Heat exchanger, 2 ... Tube, 4 ... Header pipe, 7 ...
Tanks, 8, 12 ... Couplings, 10 ... Holding pieces, 11 ... End plates

Claims (1)

[Scope of utility model registration request] 1. Header pipes are connected to both ends of a large number of tubes arranged in parallel with each other, and these header pipes are divided into two parts in a tube connecting direction into a semi-arcuate tank and a semi-arcuate end plate, A parallel flow type heat exchanger in which the joint portion of the end plate is disposed inside the joint portion of the tank and integrally joined, wherein one joint portion of the tank and the end plate is connected to the end plate and the tank. A header structure for a heat exchanger, characterized in that a holding piece for holding the other from the outside is bent along the curved surface of the other side.