Die-cast pressure shell structure

Abstract

The utility model discloses a kind of die-casting pressure shell structures, it is related to turbocharger field, a kind of die-casting pressure shell structure includes shell upper cover, shell lower cover and connecting piece;Centrifugal core-pulling mode die-casting shell upper cover is formed, and die-casting shell lower cover is formed;After the first connecting platform of pressure shell upper cover and the second connecting platform of lower cover are pasted and pressed tightly, through conical core rod extrusion inlay ring, inlay ring of pressure shell lower cover is deformed, is embedded into the embedding groove of pressure shell upper cover, the connection of pressure shell upper cover and pressure shell lower cover is completed;Shell upper cover and shell lower cover using split design, inlay type connection forms pressure shell, shell upper cover and shell lower cover use die-casting process, effectively reduce the part wall thickness, and component surface roughness is better, reduce airflow friction loss, it is favorable to improve compressor performance, component size is more stable, product pass rate is higher.

Description

Technical Field

[0001] This utility model relates to the field of turbochargers, and in particular to a die-cast press shell structure. Background Technology

[0002] As a crucial component of high-end automotive engines, the turbocharger's primary function is to increase the intake air density, ensuring more complete fuel combustion and increasing engine power. A common type of turbocharger is the exhaust gas bypass turbocharger, which utilizes the high-temperature exhaust gases from the engine to drive the turbocharger's turbine, which in turn powers the compressor. Because the amount of exhaust gas emitted by a car engine varies at different engine speeds, the required intake air volume also varies. This type of turbocharger typically incorporates an actuator within the turbine housing to control the exhaust gas bypass valve, thereby regulating the amount of exhaust gas entering the turbine.

[0003] like Figure 1 and Figure 2 As shown, the pressure shell, as one of the core components of the turbocharger, is usually made of cast aluminum by sand casting. Due to the complex structure of the pressure shell, which includes an outer shell and an inner core, the outer shell and inner core sand core are made separately, and then the two are assembled into one piece and aluminum liquid is poured. After casting, the outer shell sand core and the inner core sand core are knocked out to obtain the product.

[0004] Due to the limited surface strength of the sand core, the surface roughness of the molded product is poor and the surface deviation of the parts is large. In order to compensate for the casting deviation and ensure the strength of the parts, the wall thickness of the parts needs to be set to be thicker during the design, resulting in the weight of the parts being heavier. Utility Model Content

[0005] The purpose of this invention is to design a die-casting pressure shell structure to solve the above problems.

[0006] This utility model achieves the above objectives through the following technical solutions: A die-cast shell structure includes an upper shell cover, a lower shell cover, and a connector. Both the upper shell cover and the lower shell cover are die-cast and are fixedly connected by the connector.

[0007] The beneficial effects of this utility model are as follows: The upper and lower covers of the housing are designed as separate units, which are then embedded together to form a pressure shell. Furthermore, the upper and lower covers are manufactured using a die-casting process, simplifying the production of the pressure shell product. Because of the die-casting process, the wall thickness of the parts can be reduced by 15%-20%, resulting in a lower overall weight, a more compact structure, lower production costs, and better surface roughness, reducing airflow friction loss and improving compressor performance. The dimensions of the parts are also more stable, leading to a higher product qualification rate. The inlet and outlet sections, with lower dimensional requirements, can be directly formed using a mold process, reducing processing steps. The machining allowance for high-precision flange faces, diffuser faces, and profiled surfaces can be reduced by 20%-25%, lowering processing costs. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a pressure shell structure produced by sand casting in the background technology; Figure 2 yes Figure 1 AA section view; Figure 3 This is a schematic diagram of a die-casting pressure shell structure according to the present invention; Figure 4 yes Figure 3 BB section view; Figure 5 This is an isometric view of the upper cover of the shell in a die-casting shell structure according to this utility model; Figure 6 This is a cross-sectional view of the upper cover of the shell in a die-casting shell structure according to this utility model; Figure 7 This is an isometric view of the lower cover of the shell in a die-casting shell structure according to this utility model; Figure 8 This is a cross-sectional view of the lower cover of the shell in a die-casting shell structure according to this utility model; Figure 9 This is a schematic diagram of the tooth profile of the annular groove structure embedded in the die-casting shell structure of this utility model. Figure 1 ; Figure 10 This is a schematic diagram of the tooth profile of the annular groove structure embedded in the die-casting shell structure of this utility model. Figure 2 ; Figure 11 This is a schematic diagram of the tooth profile of the annular groove structure embedded in the die-casting shell structure of this utility model. Figure 3 ; Figure 12 This is a schematic diagram showing the connection between the upper cover and the lower cover of the housing; The corresponding figure labels are: 1-Shell top cover, 2-Shell bottom cover, 3-Matching ring, 4-Embedded groove, 5-First connecting platform, 6-Second connecting platform, 7-Avoidance ring groove, 8-Shaped surface, 9-Diffuser surface, 10-Annular groove structure, 11-Triangular structure, 12-Trapezoidal structure, 13-Right-angled trapezoidal structure, 14-Inlet section, 15-Flow channel, 16-Outlet section, 17-Connecting flange, 18-Conical mandrel, 19-First waist edge, 20-Second waist edge, 21-Third waist edge, 22-Fourth waist edge. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0010] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0011] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0012] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0013] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0014] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0015] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0016] like Figures 3-11 As shown, a die-cast shell structure includes an upper shell cover 1, a lower shell cover 2, and a connector. Both the upper shell cover 1 and the lower shell cover 2 are die-cast and are fixedly connected by the connector.

[0017] The connector includes a fitting ring 3, an embedding groove 4, a first connecting platform 5, and a second connecting platform 6. The fitting ring 3 and the lower cover 2 of the housing are integrally formed by die casting. The embedding groove 4 is provided on the upper cover 1 of the housing, and the outer side wall of the fitting ring 3 is in extrusion contact with the embedding groove 4. The first connecting platform 5 and the second connecting platform 6 are respectively provided on the upper cover 1 and the lower cover 2 of the housing, and the first connecting platform 5 and the second connecting platform 6 are in extrusion contact.

[0018] Both the first connecting platform 5 and the second connecting platform 6 are equipped with clearance ring grooves 7, which can reduce machining allowance.

[0019] The housing cover 1 includes an inlet section 14, a flow channel 15, an outlet section 16, and a connecting flange 17. The flow channel 15 and the connecting flange 17 have a concave structure, which facilitates the removal of the die-casting mold.

[0020] The side of the lower cover 2 away from the upper cover 1 is the profile surface 8, and the inner side of the connection between the lower cover 2 and the fitting ring 3 is the diffuser surface 9.

[0021] like Figure 9 As shown, the inner wall of the embedding groove 4 is recessed with a plurality of annular groove structures 10, and the plurality of annular groove structures 10 are arranged in an array along the central axis of the embedding groove 4.

[0022] The tooth shape of the annular groove structure 10 is a triangular structure 11.

[0023] like Figure 10As shown, the tooth profile of the annular groove structure 10 is a trapezoidal structure 12. The distance between the upper base of the trapezoidal structure 12 and the central axis of the embedding groove 4 is greater than the distance between the lower base of the trapezoidal structure 12 and the central axis of the embedding groove 4. The acute angle between the first waist 19 of the trapezoidal structure 12 and the central axis of the embedding groove 4 is smaller than the acute angle between the second waist 20 of the trapezoidal structure 12 and the central axis of the embedding groove 4. The direction from the second waist 20 to the first waist 19 is the moving direction when the fitting ring 3 is embedded and installed into the embedding groove 4. The angle between the first waist 19 and the second waist 20 is in the range of 0-60°, which is beneficial for the embedding of the fitting ring 3 during extrusion deformation.

[0024] like Figure 11 As shown, the tooth profile of the annular groove structure 8 is a right-angled trapezoidal structure 13. The direction from the third waist 21 to the fourth waist 22 of the right-angled trapezoidal structure 13 is the moving direction when the fitting ring 3 is inserted into the insertion groove 4. The angle between the third waist 21 and the central axis of the insertion groove 4 is a right angle to prevent the fitting ring 3 from coming out after being inserted.

[0025] A method for casting a die-cast shell structure includes: die-casting an upper shell cover 1 and a lower shell cover 2 using a centrifugal core-pulling method; machining the outer surfaces of the embedding groove 4 and the first connecting platform 5 of the upper shell cover 1, as well as the second connecting platform 6 and the fitting ring 3 of the lower shell cover; pressing the first connecting platform 5 of the upper shell cover and the second connecting platform 6 of the lower shell cover flat and tightly, and then pressing the fitting ring 3 with a conical mandrel 18, such as... Figure 12 As shown, the fitting ring 3 of the lower cover of the pressure shell deforms and is embedded in the embedding groove 4 of the upper cover of the pressure shell, thus completing the connection between the upper cover 1 and the lower cover 2 of the pressure shell, forming a die-cast pressure shell structure as described above.

[0026] By using die casting to manufacture the pressure shell structure, the wall thickness of the parts can be reduced by 15% to 20%, the overall weight of the parts is reduced, the structure is more compact, and the production cost is lower.

[0027] The use of die casting technology results in better surface roughness of parts, reduces airflow friction loss, and helps improve compressor performance.

[0028] The use of die casting technology results in more stable component dimensions and a higher product qualification rate. For the inlet and outlet sections 16, which have lower dimensional requirements, the die-casting process can be used to directly adopt the mold forming process, reducing the number of processing steps. By using die casting, the machining allowance of high-precision flange faces, diffuser faces 9, and profile faces 8 can be reduced by 20%-25%, thus reducing machining costs.

[0029] The technical solution of this utility model is not limited to the specific embodiments described above. All technical modifications made based on the technical solution of this utility model shall fall within the protection scope of this utility model.

Claims

1. A die-casting press shell structure, characterized in that, It includes an upper cover, a lower cover, and connectors. Both the upper and lower covers are die-cast and are fixedly connected by connectors.

2. The die-casting shell structure according to claim 1, characterized in that, The connector includes a fitting ring, an insert groove, a first connecting platform, and a second connecting platform. The fitting ring and the lower cover of the housing are integrally formed by die casting. The insert groove is set on the upper cover of the housing, and the outer wall of the fitting ring is in extrusion contact with the insert groove. The first connecting platform and the second connecting platform are respectively set on the upper cover and the lower cover of the housing, and the first connecting platform and the second connecting platform are in extrusion contact.

3. The die-casting shell structure according to claim 2, characterized in that, Both the first and second connecting platforms are equipped with clearance ring grooves.

4. The die-casting shell structure according to claim 2, characterized in that, The flow channels and connecting flanges on the shell cover have an inwardly recessed structure.

5. The die-casting pressure shell structure according to claim 2, characterized in that, The side of the lower cover away from the upper cover is a profiled surface, and the inner side of the connection between the lower cover and the fitting ring is a diffuser surface.

6. The die-casting shell structure according to claim 2, characterized in that, The inner wall of the embedding groove is recessed with multiple annular groove structures, which are arranged in an array along the central axis of the embedding groove.

7. The die-casting pressure shell structure according to claim 6, characterized in that, The tooth profile of the annular groove structure is triangular.

8. The die-casting pressure shell structure according to claim 6, characterized in that, The tooth profile of the annular groove structure is a trapezoidal structure. The distance between the upper base of the trapezoid and the central axis of the insertion groove is greater than the distance between the lower base of the trapezoid and the central axis of the insertion groove. The acute angle between the first waist of the trapezoid and the central axis of the insertion groove is smaller than the acute angle between the second waist of the trapezoid and the central axis of the insertion groove. The direction from the second waist to the first waist is the direction of movement when the fitting ring is inserted into the insertion groove. The angle between the first waist and the second waist ranges from 0 to 60°.

9. A die-casting pressure shell structure according to claim 6, characterized in that, The tooth profile of the annular groove structure is a right-angled trapezoidal structure. The direction from the third waist to the fourth waist of the right-angled trapezoidal structure is the direction of movement when the fitting ring is inserted into the insertion groove. The angle between the third waist and the central axis of the insertion groove is a right angle.

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