A supercharger shell with a supercharged air circulation structure

Abstract

The utility model provides a kind of supercharger pressure shell with supercharged air circulation structure, including pressure shell main body, integrally formed air inlet pipe and air outlet pipe, and the backflow pipeline being arranged between air inlet pipe and air outlet pipe.The backflow pipeline is equipped with linear or arc backflow channel, its rear end is communicated with air inlet pipe, and front end is equipped with the opening for mounting plugging piece.Backflow hole, which is communicated with backflow channel, is opened on the backflow pipeline wall, and communicated with air outlet pipe.Backflow pipeline wall is also equipped with coaxial installation valve seat opposite backflow hole, for installing circulation valve (ECRV).The structure simplifies backflow channel, makes it adapt to core-pulling demand of high-pressure casting process, avoids complex structure dependence sand casting, significantly improves production efficiency and reduces cost;At the same time, backflow is guided through communicated backflow hole, effectively prevents compressor surge, and integrated installation valve seat improves structural compactness.

Description

Technical Field

[0001] This utility model relates to the field of turbocharger technology, and more specifically, to a turbocharger housing with a pressurized air circulation structure. Background Technology

[0002] During engine operation, when the throttle valve in the intake system suddenly closes, the pressure in the intake passage changes drastically. If left uncontrolled, this can easily cause compressor surge. Compressor surge not only significantly reduces engine performance but can also cause serious damage to the compressor and related components, greatly affecting the engine's reliability and durability.

[0003] To effectively address this issue, the industry commonly employs the introduction of a compressor recirculation valve (ECRV). When the throttle is closed, the ECRV opens promptly, redirecting some of the high-pressure gas back to the turbocharger's intake port, thereby balancing the pressure and preventing surge. For compact layout considerations, many designs opt to place the ECRV directly onto the turbocharger housing. While this arrangement optimizes space utilization to some extent, it introduces new challenges to the design and manufacturing of the housing. The need to construct a dedicated return channel on the housing for effective gas circulation makes the structure of this return channel extremely complex.

[0004] Among current mainstream casting processes, high-pressure casting boasts numerous advantages, including high production efficiency and high casting precision. However, it faces the challenge of core removal due to the complex reflux channel structure. This is because high-pressure casting requires specific spatial and structural conditions for core removal, and the complex reflux channel design hinders this operation. In such cases, sand casting is the only viable alternative for manufacturing the pressure shell. However, sand casting itself has significant limitations; its production efficiency is far lower than high-pressure casting, and its casting cost is higher. This not only increases production time and costs but also limits the large-scale production and application of the product to some extent. Utility Model Content

[0005] The technical problem to be solved by this application is that the design of the complex reflux channel is difficult to adapt to the core-pulling requirements of the high-pressure casting process. In order to overcome the above-mentioned defects of the prior art, this application provides a booster housing with a booster air circulation structure.

[0006] This application provides a booster housing with a pressurized air circulation structure, including a housing body and an intake pipe and an outlet pipe integrally formed on the housing body. A return pipe is provided between the intake pipe and the outlet pipe. The return pipe has a straight or arc-shaped return channel. The rear end of the return channel is connected to the intake pipe, and the front end of the return channel has an opening for installing a sealing component. The wall of the return pipe has a return hole communicating with the return channel. The return hole is connected to the outlet pipe. The wall of the return pipe also has a mounting valve seat coaxial with the return hole for installing a circulation valve.

[0007] Compared with existing technologies, the turbocharger housing with a pressurized air circulation structure disclosed in this application has the following advantages: the simplified straight or arc-shaped return channel structure, combined with the opening at the front end of the return channel, can adapt to the core-pulling requirements of high-pressure casting processes, avoiding reliance on sand casting processes due to complex structures, improving production efficiency and reducing costs; the interconnected design of the return hole and the return channel can guide the high-pressure gas in the exhaust pipe through the return hole into the return channel, and then return to the intake pipe, balancing the intake pressure when the throttle is closed, effectively preventing compressor surge, protecting engine performance and component reliability; the valve seat configuration provides an integrated installation position for the recirculation valve (ECRV), eliminating the need for additional layout space and improving the compactness of the turbocharger structure.

[0008] In one possible implementation, the cross-sectional area of ​​the return channel is larger than that of the return orifice. Compared to the prior art, the larger cross-sectional area of ​​the return channel can accommodate more gas. Combined with the smaller cross-sectional area of ​​the return orifice, a pressure gradient is formed, which facilitates the smoother flow of gas from the outlet pipe through the return orifice into the return channel, thereby enhancing the stability of the anti-surge effect.

[0009] In one possible implementation, the outer periphery of the mounting seat is provided with several internally threaded holes, and the circulation valve is mounted on the mounting seat by bolts engaging the internally threaded holes. Compared with the prior art, the bolt connection method can ensure a tight fit between the circulation valve and the mounting seat, preventing gas leakage, while also facilitating disassembly and maintenance, and reducing maintenance costs.

[0010] In one possible implementation, the return pipe and the pressure shell body are integrally formed. Compared with the prior art, the integral forming design eliminates the assembly gap between the return pipe and the pressure shell body, improves the overall structural strength and high pressure resistance, and reduces the risk of leakage.

[0011] In one possible implementation, the pressure shell body is made of aluminum alloy. Compared with the prior art, aluminum alloy is lightweight, which can reduce the overall load on the turbocharger, while possessing sufficient strength and corrosion resistance, extending the service life of the pressure shell, and improving engine economy.

[0012] In one possible implementation, the pressure shell body is provided with a basic flow channel in a B-shape. Compared with the prior art, the B-shape flow channel design meets the demolding process requirements of high-pressure casting, solves the problem of difficult core pulling in complex flow channels, ensures that the pressure shell can be formed by high-pressure casting, improves production efficiency and reduces costs.

[0013] In one possible implementation, the end face of the reflux hole located on the inner wall of the reflux channel is machined and recessed, serving as abutment for the circulation valve. Compared to the prior art, the recessed end face provides a flat abutment surface for the circulation valve, and together with the sealing structure, effectively prevents gas leakage from the connection between the reflux hole and the circulation valve, ensuring the sealing performance of the reflux system.

[0014] In one possible implementation, the reflux orifice is located above the outlet pipe. Compared to existing technologies, this reduces flow resistance, improves gas reflux efficiency, and enhances anti-surge performance.

[0015] In one possible implementation, the sealing element is a plug or a cup-shaped plug. Compared with the prior art, this limits the sealing element to a single sealing form, facilitating the sealing of openings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1; Figure 2 A partial cross-section of Example 1 Figure 1 ; Figure 3 A partial cross-section of Example 1 Figure 2 ; Figure 4 A partial cross-section of Example 1 Figure 3 ; Figure 5 This is a cross-sectional view of the usage state of Embodiment 1; Figure 6 This is a schematic diagram of the structure of Example 2; Explanation of reference numerals in the attached figures: 1. Pressure shell body; 11. Basic flow channel; 2. Inlet pipe; 3. Outlet pipe; 4. Return pipe; 41. Return channel; 42. Opening; 43. Return hole; 44. Mounting valve seat; 45. Internal threaded hole; 10. Sealing component; 20. Circulation valve. Detailed Implementation

[0017] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0018] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0019] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 See Figures 1 to 5 This application discloses a booster housing with a pressurized air circulation structure, including a housing body 1 and an intake pipe 2 and an outlet pipe 3 integrally formed on the housing body 1. A return pipe 4 is provided between the intake pipe 2 and the outlet pipe 3. The return pipe 4 has a straight or arc-shaped return channel 41. The rear end of the return channel 41 is connected to the intake pipe 2, and the front end of the return channel 41 has an opening 42 for the installation of a sealing component 10. The wall of the return pipe 4 has a return hole 43 that connects to the return channel 41 and is connected to the outlet pipe 3. The wall of the return pipe 4 also has a mounting valve seat 44 that is coaxial with the return hole 43 and is used for the installation of a circulation valve 20.

[0022] The compressor housing body 1, intake pipe 2, outlet pipe 3, and return pipe 4 are manufactured using an integrated aluminum alloy molding process to ensure the strength and sealing of the overall structure. The return channel 41 within the return pipe 4 is designed with a cross-sectional center trajectory that is either arc-shaped or straight, according to high-pressure casting requirements. Taking the arc shape as an example, it allows for smoother gas flow during return, reducing resistance and pressure loss, while also avoiding the threaded mounting hole of the circulation valve 20. The rear end of the return channel 41 connects to the intake pipe 2. An opening 42 is provided at the front end of the return channel 41. The size of the opening 42 is adapted to the sealing component 10, which is made of stainless steel, such as a plug or cup-shaped plug. It is installed at the opening 42 through interference fit or threaded connection to prevent gas leakage. The return pipe 4 has a return hole 43 on its wall, which connects to the outlet pipe 3 through a reasonable flow channel design. A valve seat 44 is installed at a position where the wall of the return pipe 4 is coaxially opposite to the return hole 43. The size and shape of the valve seat 44 are matched with the circulation valve 20 so that the circulation valve 20 can be installed.

[0023] In this embodiment, the cross-sectional shape of the return channel 41 is elliptical.

[0024] In this embodiment, the cross-sectional area of ​​the return channel 41 is larger than that of the return hole 43. Specifically, when designing the dimensions of the return channel 41 and the return hole 43, fluid dynamics calculations and experimental verification are used to ensure that the cross-sectional area of ​​the return channel 41 is larger than that of the return hole 43. This design allows the gas to flow at a lower velocity in the return channel 41, forming a certain pressure difference, ensuring that the gas can flow smoothly from the outlet pipe 3 to the inlet pipe 2, thus achieving effective gas circulation.

[0025] In this embodiment, the outer periphery of the mounting valve seat 44 is provided with several internally threaded holes 45. The circulation valve 20 is mounted on the mounting valve seat 44 by bolts engaging the internally threaded holes 45. Specifically, several internally threaded holes 45 are machined on the outer periphery of the mounting valve seat 44 using drilling and tapping equipment. The number and distribution of the internally threaded holes 45 are determined according to the installation requirements of the circulation valve 20. For example, the number of internally threaded holes 45 is three. The circulation valve 20 is provided with bolt holes corresponding to the internally threaded holes 45. By passing the bolt through the bolt holes of the circulation valve 20 and screwing it into the internally threaded holes 45 of the mounting valve seat 44, the circulation valve 20 is securely mounted on the mounting valve seat 44. During the installation process, a sealing gasket can be placed between the circulation valve 20 and the mounting valve seat 44 to further improve the sealing performance of the installation part. The intersection of the return channel 41 and the inlet pipe 2 is far away from the impeller nose, which avoids the high-pressure airflow from impacting the impeller and improves the stability of impeller operation. The extension direction of the return channel 41 avoids the internally threaded holes 45 to prevent leakage of return gas and improve the reliability of return.

[0026] like Figure 4As shown, in this embodiment, the pressure shell body 1 is provided with a B-shaped basic flow channel 11. Specifically, during the design process of the pressure shell body 1, the cross-section of the basic flow channel 11 is designed as a B-shaped structure using 3D modeling software. During the die casting process, the B-shaped structure can provide sufficient space and angle for the demolding mechanism, allowing the mold to separate smoothly from the pressure shell body 1, reducing demolding difficulty, and improving product molding quality and production efficiency. At the same time, the B-shaped basic flow channel 11 can also optimize the gas flow path within the pressure shell body 1, improving gas flow efficiency.

[0027] In this embodiment, the end face of the reflux hole 43 located on the inner wall of the reflux channel 41 is machined and recessed, and is used for the circulation valve 20 to abut against. Specifically, when machining the reflux hole 43, its end face located on the inner wall of the reflux channel 41 is machined and recessed, which can be done by milling or grinding, so that the end face forms a groove of a specific depth. After the circulation valve 20 is installed on the mounting valve seat 44, its corresponding part can abut tightly against the groove, which not only improves the stability of the installation of the circulation valve 20, but also enhances the sealing of the installation part and prevents gas from leaking from the connection between the circulation valve 20 and the reflux hole 43.

[0028] In this embodiment, the reflux hole 43 is located above the exhaust pipe 3. Specifically, to optimize the layout design of the pressure shell body 1, the reflux hole 43 is positioned above the exhaust pipe 3.

[0029] Example 2 like Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the cross-sectional shape of the return channel 41 is rectangular, and its four corners are rounded.

[0030] In practical applications, the turbocharger housing is used so that when the engine throttle is suddenly closed, the recirculation valve 20 (ECRV) opens, allowing high-pressure gas in the outlet pipe 3 to enter the recirculation channel 41 in the recirculation pipe 4 through the recirculation hole 43, and then flow back to the intake pipe 2, balancing the intake pressure and preventing compressor surge. Specifically: the recirculation channel 41 has a simplified structure, is compatible with high-pressure casting core pulling, avoids sand casting, improves efficiency, and reduces costs; the cross-sectional area of ​​the recirculation channel 41 is larger than that of the recirculation hole 43, forming a pressure gradient and promoting smooth gas recirculation; the valve seat 44 integrates the recirculation valve 20 (ECRV), improving structural compactness; the B-type basic flow channel 11 facilitates die casting demolding; the aluminum alloy material reduces load and enhances corrosion resistance; and the one-piece molding structure improves strength and sealing.

[0031] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0032] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A booster housing with a pressurized air circulation structure, comprising a housing body and an inlet pipe and an outlet pipe integrally formed on the housing body, wherein a return pipe is provided between the inlet pipe and the outlet pipe, characterized in that, The return pipe has a straight or arc-shaped return channel. The rear end of the return channel is connected to the air inlet pipe, and the front end of the return channel has an opening for the installation of a sealing component. The return pipe wall has a return hole that connects to the return channel and is connected to the air outlet pipe. The return pipe wall also has a mounting valve seat that is coaxial with the return hole and is used for the installation of a circulation valve.

2. The booster housing with a boosted air circulation structure according to claim 1, characterized in that, The cross-sectional area of ​​the return channel is larger than the cross-sectional area of ​​the return hole.

3. The booster housing with a boosted air circulation structure according to claim 1, characterized in that, The outer circumference of the mounting seat is provided with several internal threaded holes, and the circulation valve is installed on the mounting seat by bolts engaging the internal threaded holes.

4. The booster housing with a boosted air circulation structure according to claim 3, characterized in that, The recirculation channel is located away from the impeller nose at its intersection with the intake pipe; the extension direction of the recirculation channel avoids the internal threaded hole.

5. The booster housing with a boosted air circulation structure according to claim 1, characterized in that, The return pipe and the pressure shell body are integrally formed; the pressure shell body is made of aluminum alloy.

6. The turbocharger housing with a pressurized air circulation structure according to claim 1, characterized in that, The main body of the pressure shell is provided with a basic flow channel with a B-shaped structure.

7. The turbocharger housing with a pressurized air circulation structure according to claim 1, characterized in that, The end face of the reflux hole located on the inner wall of the reflux channel is machined and recessed, and is used for the circulation valve to abut against.

8. The booster housing with a boosted air circulation structure according to claim 1, characterized in that, The reflux hole is located above the air outlet pipe.

9. The booster housing with a boosted air circulation structure according to claim 1, characterized in that, The sealing component is a plug or a cup-shaped plug.

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