JP5486841B2 - Delon cup type heat exchanger - Google Patents

Description

  The present invention relates to a structure of a heat exchanger having a hollow structure such as a drone cup type oil cooler, evaporator, intercooler, or radiator that joins core units of a heat exchange section in multiple stages.

  Conventionally, some heat exchangers are configured by joining heat exchange portions in multiple stages. This type of heat exchanger has a hollow structure called a so-called Drone Cup type structure, with copper, aluminum, copper alloy or aluminum alloy as a core material, and brazing material on one or both sides as a skin material. Manufactured by a method of brazing and heating a drone cup in a multistage using a clad brazing sheet in a vacuum or an atmospheric furnace, etc., as an oil cooler, evaporator, intercooler or radiator, the fluid flowing inside the drone cup hollow part and the hollow part A heat exchanger for fluid flowing on the surface of the flow path is performed.

  An example of a conventional drone cup type heat exchanger is shown in FIG. As shown in FIG. 6, in a vehicle air conditioner radiator, a corrugated fin 3 is interposed between two tubes having a flat cross section formed by joining two drone cup plates 2 in the middle. It is manufactured by vacuum brazing or integrally brazing in an atmospheric furnace. FIGS. 7A, 7B, and 7C are a front view, a plan view, and a left side view of the vehicle air-conditioning radiator shown in FIG. FIG. 8 shows a cross-section in the arrow direction of the joined portion of the drone cup plate 2 of FIGS. 6 and 7. This cross section is the upper side of the heat exchanger 1, but the lower side is the same cross section. The drone cup plate 2 is formed by press-molding a brazing material clad on the surface of an aluminum plate or a copper plate into a middle skin shape and laminating so as to form a hollow portion inside. Moreover, the communication hole 7 is formed so that it may become a cooling water flow path.

The drone cup type vehicle air conditioning radiator described above is provided with a fluid inlet 5 and a fluid outlet 6 at positions corresponding to the communication holes 7 of the end plate 4 as shown in FIG. As a result, the fluid that has flowed into the drone cup from the fluid inlet 5 flows through the fluid flow passage 8 from the lower communication hole 7 of the heat exchanger 1 and rises while the air flowing through the cooling air passage 10 rises. Heat exchange is performed to cool the refrigerant, and the refrigerant flows through the upper communication hole 7 of the heat exchanger 1 and returns to the circuit from the fluid outlet 6.
Regarding this type of heat exchanger, for example, Patent Document 1, Patent Document 2, and Patent Document 3 describe the structure and manufacturing method.

Japanese Patent Laid-Open No. 5-104286 (paragraph number 0004, FIG. 8) Japanese Patent No. 4048629 (paragraph number 0018, FIG. 1) Japanese Patent Laying-Open No. 2005-37031 (paragraph number 0010, FIG. 1)

  When such a heat exchanger is incorporated and used as a cooling device in a closed circuit, when the encapsulated refrigerant is heated by a heat generating part in the circuit, the refrigerant rises in temperature, boils and evaporates. The internal pressure in the circuit rises above the atmospheric pressure. Further, when the heat generating portion cools, the internal pressure decreases. As the internal pressure fluctuates, the drone cup plate 2 of the heat exchanger repeatedly expands and contracts in the stacking direction as shown by the broken line in FIG. In general, the thickness of the drone cup of a heat exchanger is about 0.3 to 1 mm, and in the thin structure with a thickness of 0.3 mm or less corresponding to the recent light weight design, the draw cup is formed with the expansion and contraction of the drone cup. There is a concern that the fatigue life may be reduced due to repetitive stress generated near the corners.

  The present invention has been made to solve the above problems, and has a heat exchanger structure capable of suppressing the expansion and contraction deformation in the laminating direction accompanying the fluctuation of the internal pressure of the drone cup heat exchanger and improving the reliability of the product. It is to provide.

The drone cup type heat exchanger according to the present invention is formed by a pair of drone cup plates that are vertically shaped in the middle and the middle part is formed into an elongated flat shape, and the corrugated fins are disposed between the drone cup plates. A heat exchanger joining structure in which hollow flat heat transfer tubes stacked with intervening layers are joined in multiple stages to form a fluid inlet and a fluid outlet, wherein the pair of drone cup plates has an elongated flat shape. The fluid inlet is provided at one end of the drone cup plate that extends vertically, and the fluid outlet is provided at the other end of the drone cup plate that is symmetrical to the fluid inlet. A fluid flow path communicating between the inflow port and the fluid inflow port is formed, and the joining peripheral edge portions of the pair of drone cup plates are coupled along the stacking direction of the flat heat transfer tubes Are those in which bamboo provided binding members, the connecting member has a comb-like groove that joining peripheral edge of said pair of drone cup plate is fitted, along the stacking direction of the flat heat transfer tube The joining peripheral edge portion is fitted into the fitting groove and joined .

According to this invention, a member for connecting the peripheral edges of the drone cups to each other in the stacking direction and having a comb-like fitting groove for fitting the joint peripheral edge of the drone cup plate is provided. Each drone cup plate that constitutes a flat heat transfer tube is securely held in a comb-like fitting groove by a connecting member , and is configured to restrict expansion and contraction in the stacking direction of the drone cup. It is possible to suppress expansion and contraction due to internal pressure fluctuations due to temperature changes of the fluid flowing through the pipe, and to reduce the stress generated by repeated deformations accompanying internal pressure fluctuations. Reliability can be improved, and the flow is made to flow at the other end of the drone cup plate that is symmetrical to the fluid inlet provided at one end of the drone cup plate extending vertically. By providing the outlet, the product reliability can be further reduced deformation stress can be further improved.

The perspective view of the heat exchanger in Embodiment 1 which concerns on this invention. The fragmentary sectional view of the heat exchanger in Embodiment 1 of this invention. The perspective view of the heat exchanger in Embodiment 2 of this invention. The perspective view of the heat exchanger in Embodiment 3 of this invention. The fragmentary sectional view of the heat exchanger in Embodiment 3 of this invention. The perspective view of the conventional heat exchanger. The front view, top view, and left view of the conventional heat exchanger. The fragmentary sectional view of the conventional heat exchanger. The fragmentary sectional view explaining the expansion-contraction state of the drone cup plate in the conventional heat exchanger.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 shows a perspective view of a water-cooled radiator as an embodiment of a heat exchanger joining structure according to the present invention.
This heat exchanger (radiator) 1 is formed of a pair of drone cup plates 2 whose upper and lower sides are formed in the middle and the middle part is formed into an elongated flat shape, and between the two drone cup plates 2, The corrugated fins 3 are interposed and laminated, and are manufactured by vacuum brazing or integrally brazing in an atmospheric furnace. At this time, the connecting member 9 is connected to the peripheral edge of the mating portion on the side surface of the drone cup plate 2 and integrally brazed.

In addition, in the Example shown in FIG. The connecting member 9 has a groove-shaped cross section, is provided with a comb-like cut (fitting groove) that matches the stacking pitch of the mating portion of the drone cup 2, and is fitted to the periphery of the mating portion as shown in FIG. It is installed as follows. That is, the peripheral edge where the drone cup plate 2 is overlapped is connected by the comb-like fitting groove of the connecting member 9.
The plate | board thickness of the peripheral part on which the drone cup plate 2 was piled up is twice the thickness of the drone cup plate 2, and its mechanical strength is large. Since the drone cup plate 2 is connected by the connecting member 9 at this portion, the drone cup plates can be reliably fixed to each other, and the displacement of the drone cup can be reasonably suppressed.

By providing the connecting member 9 in this manner, expansion / contraction deformation is restricted in the stacking direction of the stacked drone cups, and expansion / contraction deformation due to internal pressure fluctuation due to temperature change of the fluid flowing in the drone cup plate is suppressed. Can do. For this reason, since the stress which generate | occur | produces by the repetitive deformation accompanying internal pressure fluctuation | variation can be reduced, the improvement of the fatigue life of a heat exchanger can be anticipated, and the reliability of a product can be improved.
Note that the shape of the connecting member 9 is not limited to the one having the above-described fitting groove, and is a structure that is joined to the peripheral portion of the drone cup plate 2 and restricts expansion and contraction in the stacking direction of the drone cup plate 2. Any other shape may be used as long as it is made of a beam. Moreover, in the said embodiment, although the radiator was demonstrated, it is applicable also to other heat exchangers, such as an oil cooler.

Embodiment 2. FIG.
FIG. 3 is a perspective view showing an embodiment of another joining structure of the heat exchanger according to the present invention.
In this embodiment of the heat exchanger (radiator) 1, as shown in FIG. 3, wide connecting members 19 are installed on the top and bottom surfaces of the drone cup plate 2. The connecting member 19 is provided with a comb-like cut (fitting groove) that matches the stacking pitch of the mating portion of the drone cup 2 as in the first embodiment, and a pair of drone cup plates as in the first embodiment. It installs so that it may fit in 2 alignment part periphery.

  By providing the connecting members 19 on the top and bottom surfaces of the heat exchanger in this way, the expansion and contraction is restricted in the stacking direction of the stacked drone cups, and the internal pressure due to the temperature change of the fluid flowing in the drone cup plate Expansion and contraction due to fluctuations can be suppressed. Therefore, since the stress generated by repeated deformation accompanying internal pressure fluctuations can be reduced as in the first embodiment, the fatigue life of the heat exchanger can be expected to be improved, and the reliability of the product can be improved.

Embodiment 3 FIG.
FIG. 4 is a perspective view showing still another embodiment of the joining structure of the heat exchanger according to the present invention.
The connecting member 29 in the heat exchanger (radiator) 1 is composed of a tongue piece 29a extending continuously in the laminating direction of the drone cups continuously to the peripheral part of the portion of the drone cup plate 2 to be molded in the middle. The tongue piece 29a is configured such that the tip portions are bent into an L shape and the bent tip portions face each other. Adjacent tip portions of the tongue pieces 29a are brought into close contact with each other as shown in FIG. 5 (cross-sectional view in FIG. 4) and brazed to connect the drone cup plates 2 to each other.

In this way, by providing the L-shaped bending connecting member 29 extending from the main body of the drone cup plate 2 and connecting them together, the elastic deformation is restricted in the stacking direction of the stacked drone cups. Expansion and contraction accompanying internal pressure fluctuations due to temperature changes of the fluid flowing in the cup plate can be suppressed. Also, with this structure, the connecting member can be formed integrally with the drone cup, and simplification and weight reduction can be achieved.
Accordingly, in this case as well, the stress generated by repeated deformation accompanying internal pressure fluctuation can be reduced as in the first embodiment, so that the fatigue life of the heat exchanger can be expected and the reliability of the product can be improved. .

  DESCRIPTION OF SYMBOLS 1 Heat exchanger, 2 Delon cup plate, 3 Corrugated fin, 4 End plate, 5 Fluid inlet, 6 Fluid outlet, 7 Communication hole, 8 Fluid flow path, 9, 19, 29 Connecting member, 10 Cooling air path, 29a Tongue piece.

Claims (3)

A hollow flat heat transfer tube which is formed by a pair of drone cup plates whose upper and lower sides are formed in the middle, and whose middle part is formed into an elongated flat shape, with corrugated fins interposed between the drone cup plates. A heat exchanger joining structure in which a fluid inlet and a fluid outlet are formed by joining in multiple stages, wherein the pair of drone cup plates are elongated flat and extend vertically. The fluid inlet is provided at one end, the fluid outlet is provided at the other end of the drone cup plate that is symmetrical to the fluid inlet, and the fluid inlet and the fluid inlet communicate with each other. to thereby form a fluid flow path, which the bonding perimeter of said pair of drone cup plate provided with a coupling member for coupling along the stacking direction of the flat heat transfer tube, the connecting member And a comb-like fitting groove into which the joining peripheral edges of the pair of drone cup plates are fitted, and the joining peripheral part is fitted into the fitting groove along the laminating direction of the flat heat transfer tubes. Delon cup type heat exchanger characterized by being joined together . Drone cup type heat exchanger according to claim 1, wherein the upper and lower two positions, characterized in that linked by a linking member having a comb-like groove of the side surface of the drone cup plate. Top and drone cup type heat exchanger according to claim 1, characterized in that connected by a connecting member of wide width of the bottom of having a comb-like groove of the drone cup plate.

Images