Core body assembly and oil cooler

Abstract

The utility model provides a core body assembly comprising a plurality of stacked chip assemblies, each chip assembly is provided with a through hole, and each chip assembly comprises a first chip and a second chip; in the same chip assembly, the first chip is located above the second chip, and an oil duct fin is arranged between the first chip and the second chip; a water channel fin is arranged between every two adjacent chip assemblies; one end, close to the through hole, of the first chip is provided with a first convex hull plane, and one end, close to the through hole, of the second chip is provided with a second convex hull plane; the end, away from the oil duct fins, of the first convex hull plane is provided with a first turned-over edge which is turned over upwards, and the end, away from the oil duct fins, of the second convex hull plane is provided with a second turned-over edge which is turned over upwards. By designing the double-convex-hull flanging structure, on one hand, contact between copper welding flux and nickel-based welding flux can be effectively blocked, gaps are prevented from occurring in a brazed joint, and the problem of convex hull corrosion is solved; and on the other hand, nickel-based welding flux can be conveniently smeared between the first convex hull plane and the second convex hull plane.

Description

Technical Field

[0001] This application relates to the technical field of radiators, and in particular to a core component and an oil cooler. Background Art

[0002] Most of the engine stainless steel oil coolers used in the current market are mainly manufactured with copper as the solder. However, when such oil coolers are used in medium and large displacement engines, due to the relatively high oil temperature, there is a problem of copper precipitation in the oil cooler. The nickel-based oil cooler manufactured with nickel as the solder can solve the problem of copper precipitation. However, affected by the price of nickel-based solder, the selling price of the nickel-based oil cooler will be about 30% - 150% more expensive than that of the copper-based one. Many vehicle manufacturers cannot afford the increase in the cost of the nickel-based oil cooler. Therefore, the copper-nickel oil cooler with nickel-based solder on the oil side and copper solder on the water side has become an optimal choice.

[0003] In the current box-type oil cooler structure during copper-nickel mixed soldering, there is a situation where the nickel-based solder contacts the copper solder at the plane of the chip convex hull. When the two solders come into contact and are brazed, the Cu element and the Ni element will dissolve mutually, and the Cu and the Si element and P element in the nickel-based solder will form a eutectic phase with a lower melting point. After the low-melting eutectic is formed and flows away, when the weld cools and solidifies, gaps will appear inside the brazed joint, thus affecting the product reliability. The chip convex hull plane structure of the existing oil cooler core component (as shown in Figure 1 ) cannot avoid the contact of the two solders. Therefore, it is necessary to redesign the chip convex hull plane structure of the core component. Summary of the Invention

[0004] This application provides a core component and an oil cooler, which solve the problem that the existing chip convex hull plane structure cannot avoid the contact of the two solders during copper-nickel mixed soldering, resulting in gaps inside the brazed joint and thus affecting the product reliability.

[0005] In the first aspect of this application, a core component is provided, which includes a plurality of stacked chip components. Through holes are provided in the chip components. The chip components include a first chip and a second chip. In the same chip component, the first chip is located above the second chip, and an oil passage fin is provided between the first chip and the second chip. A water passage fin is provided between adjacent chip components. One end of the first chip close to the through hole is provided with a first convex hull plane, and one end of the second chip close to the through hole is provided with a second convex hull plane. One end of the first convex hull plane away from the oil passage fin is provided with a first flanging that turns upward, and one end of the second convex hull plane away from the oil passage fin is provided with a second flanging that turns upward.

[0006] In the technical solution provided by this application, by designing a double convex hull flanging structure, on the one hand, it can effectively block the contact between the copper solder and the nickel-based solder, avoid the appearance of gaps inside the brazed joint, and solve the problem of convex hull erosion; on the other hand, it is more convenient to apply the nickel-based solder between the first convex hull plane and the second convex hull plane.

[0007] In some embodiments, the gap between the first flange and the second flange is not less than 0.5 mm. If the gap between the first flange and the second flange is too small, capillary action will be formed, and the nickel-based solder in the gap between the first flange and the second flange will be sucked to the inside of the first flange during brazing and come into contact with the copper solder, resulting in erosion problems; by designing the gap between the first flange and the second flange to exceed 0.5 mm, capillary action cannot be formed, thereby further avoiding the contact between the two solders.

[0008] In some embodiments, the top surface height of the second flange is lower than the top surface height of the first flange. This design can prevent the nickel-based solder applied inside the second flange from overflowing over the top surface of the first flange and coming into contact with the copper solder inside the first flange when too much nickel-based solder is applied, further improving the welding stability of the first chip and the second chip at the convex hull plane.

[0009] In the second aspect of this application, an oil cooler is provided, including the above-mentioned core assembly.

[0010] The above description is only an overview of the technical solution of this application. In order to be able to more clearly understand the technical means of this application, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings in this application are used to show the preferred embodiments, facilitating those of ordinary skill in the art to clearly understand various other advantages and benefits, and should not be considered as a limitation to this application. Moreover, in all the drawings, the same reference numerals are used to represent the same or similar components.

[0012] Figure 1 It is a schematic structural diagram of the core assembly in the prior art;

[0013] Figure 2 It is a schematic structural diagram of the core assembly in an embodiment of this application;

[0014] Reference numerals: 1, first chip; 2, second chip; 3, oil passage fin; 4, water passage fin; 5, first convex hull plane; 6, second convex hull plane; 7, first flange; 8, second flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0016] Reference to "embodiments" in this document means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0017] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more (including two), unless otherwise specifically defined.

[0018] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0019] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0020] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0021] Please refer to Figure 2 , an embodiment of the present application provides a core component, which includes several stacked chip components. Through holes are provided on the chip components. The chip components include a first chip 1 and a second chip 2. In the same chip component, the first chip 1 is located above the second chip 2, and an oil channel fin 3 is provided between the first chip 1 and the second chip 2. A water channel fin 4 is provided between adjacent chip components. One end of the first chip 1 close to the through hole is provided with a first convex plane 5, and one end of the second chip 2 close to the through hole is provided with a second convex plane 6. One end of the first convex plane 5 away from the oil channel fin 3 is provided with a first turned-up edge 7. One end of the second convex plane 6 away from the oil channel fin 3 is provided with a second turned-up edge 8.

[0022] In the technical solution provided by the present application, by designing a double convex turned-up edge structure, on the one hand, it can effectively block the contact between the copper solder and the nickel-based solder, avoid the appearance of gaps inside the brazed joint, and solve the problem of convex melting corrosion. On the other hand, it is more convenient to apply nickel-based solder between the first convex plane 5 and the second convex plane 6.

[0023] Please continue to refer to Figure 2 , in a specific embodiment, nickel-based solder is laid on the upper and lower surfaces of the oil channel fin 3. The lower surface of the first chip 1 is welded to the upper surface of the oil channel fin 3 through nickel-based solder. The upper surface of the second chip 2 is welded to the lower surface of the oil channel fin 3 through nickel-based solder. Copper solder (electroplated copper) is laid on the top surface of the first chip 1 and the bottom surface of the second chip 2. The top surface of the first chip 1 is welded to the bottom surface of the water channel fin 4 through copper solder. The bottom surface of the second chip 2 is welded to the top surface of the water channel fin 4 through copper solder. Nickel-based solder is laid between the first convex plane 5 and the second convex plane 6 for welding and fixing the first convex plane 5 and the second convex plane 6.

[0024] Please continue to refer to Figure 2, in some embodiments, the gap between the first flanging 7 and the second flanging 8 is not less than 0.5 mm. If the gap between the first flanging 7 and the second flanging 8 is too small, capillary action will be formed, and the nickel-based solder in the gap between the first flanging 7 and the second flanging 8 will be sucked to the inner side of the first flanging 7 to contact the copper solder during brazing, resulting in erosion problems. By designing the gap between the first flanging 7 and the second flanging 8 to exceed 0.5 mm, capillary action cannot be formed, thereby further avoiding the contact between the two solders.

[0025] Please continue to refer to Figure 2 , in some embodiments, the top surface height of the second flanging 8 is lower than the top surface height of the first flanging 7. Such a design can prevent the nickel-based solder smeared on the inner side of the second flanging 8 from overflowing over the top surface of the first flanging 7 and contacting the copper solder on the inner side of the first flanging 7, further improving the welding stability of the first chip 1 and the second chip 2 at the convex hull plane. When smearing nickel-based solder on the inner side of the second flanging 8 of the second convex hull plane 6, even if too much solder is smeared, since the top surface of the first flanging 7 is higher than the top surface of the second chip 2, after the nickel-based solder on the inner side of the second flanging 8 melts, the excessive nickel-based solder will overflow and flow away from the top surface of the second flanging 8, and will not overflow over the top surface of the first flanging 7 to contact the copper solder on the inner side of the first flanging 7.

[0026] The second aspect of the embodiments of the present application provides an oil cooler, including the above-mentioned core component.

[0027] During the welding of the chip component in this embodiment, one end of the first chip 1 far from the first convex hull and one end of the second chip 2 far from the second convex hull are welded and fixed through a flanging structure. The bottom surface of the first chip 1 and the top surface of the oil passage fin 3 are welded by a nickel-based solder (derived from the nickel-based solder smeared on the top surface of the oil passage fin 3). The top surface of the first chip 1 and the bottom surface of the water passage fin 4 are welded by a copper solder (derived from the copper electroplated on the top surface of the first chip 1). The top surface of the second chip 2 and the bottom surface of the oil passage fin 3 are welded by a nickel-based solder (derived from the nickel-based solder smeared on the bottom surface of the oil passage fin 3). The bottom surface of the second chip 2 and the top surface of the water passage fin 4 are welded by a copper solder (derived from the copper electroplated on the bottom surface of the second chip 2). The first convex hull plane 5 of the first chip 1 and the second convex hull plane 6 of the second chip 2 are welded by a nickel-based solder.

[0028] When welding the convex structure, since the gap between the first flange 7 and the second flange 8 is relatively large (greater than 0.5 mm), this gap will not form capillary action. Therefore, the molten nickel-based solder in the gap will not be sucked to the inner side of the first flange 7 to contact the copper solder due to capillary action. And because the top surface height of the second flange 8 is lower than that of the first flange 7, even if there is too much nickel-based solder inside the second flange 8, the excess nickel-based solder will only overflow from the top surface of the second flange 8 and will not overflow over the top surface of the first flange 7 to contact the copper solder. Thus, it can effectively avoid the contact of the two solders at the convex structure from causing welding gaps, ensuring the stability of the welding structure.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A core component, comprising a plurality of stacked chip components. Through holes are provided in the chip components. The chip components include a first chip (1) and a second chip (2). In the same chip component, the first chip (1) is located above the second chip (2), and an oil passage fin (3) is provided between the first chip (1) and the second chip (2). A water passage fin (4) is provided between adjacent chip components. One end of the first chip (1) close to the through hole is provided with a first convex plane (5), and one end of the second chip (2) close to the through hole is provided with a second convex plane (6). It is characterized in that, One end of the first convex hull plane (5) far from the oil channel fin (3) is provided with a first flanging (7) turned up upward, and one end of the second convex hull plane (6) far from the oil channel fin (3) is provided with a second flanging (8) turned up upward; the gap between the first flanging (7) and the second flanging (8) is not less than 0.5 mm; Nickel-based solder is laid on the upper and lower surfaces of the oil channel fin (3). The lower surface of the first chip (1) is welded to the upper surface of the oil channel fin (3) through nickel-based solder, and the upper surface of the second chip (2) is welded to the lower surface of the oil channel fin (3) through nickel-based solder; copper solder is laid on the top surface of the first chip (1) and the bottom surface of the second chip (2). The top surface of the first chip (1) is welded to the bottom surface of the water channel fin (4) through copper solder, and the bottom surface of the second chip (2) is welded to the top surface of the water channel fin (4) through copper solder; nickel-based solder is laid between the first convex hull plane (5) and the second convex hull plane (6) for welding and fixing the first convex hull plane (5) and the second convex hull plane (6).

2. The core component according to claim 1, characterized in that, The top surface height of the second flanging (8) is lower than the top surface height of the first flanging (7).

3. An oil cooler, characterized in that, Comprising the core component according to claim 1 or 2.

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