Supercharger

Abstract

The utility model provides a supercharger. The supercharger comprises a rotating shaft; the impeller structure sleeves the rotating shaft and is used for conveying gas; the sealing structure sleeves the rotating shaft; the air sealing structure is arranged on the sealing structure in a sleeving manner; a circulation cavity is defined by all the components and used for circulating gas generated by the impeller structure. And the expansion cavity is arranged on the air sealing structure, the expansion cavity forms a surface recess of the circulation cavity relative to the air sealing structure, and the expansion cavity is communicated with the circulation cavity. The supercharger effectively solves the problem that in the prior art, a supercharger is poor in oil leakage resistance.

Description

Technical Field

[0001] This utility model relates to the field of turbocharger technology, and more specifically, to a turbocharger. Background Technology

[0002] Currently, turbochargers, as a crucial component of internal combustion engines, utilize the inertial force of exhaust gases to drive a turbine. The turbine's rotation, in turn, drives a coaxial impeller on the compressor side. The impeller compresses air supplied through the air filter and forces it into the engine cylinders through a channel between the impeller and the air seal plate. Because the turbocharger rotor operates at high speeds, it easily generates significant heat, requiring ample lubricating oil for lubrication and cooling. However, lubricating oil leakage to the compressor side is a common problem during lubrication and cooling. Turbochargers typically have a shaft seal near the compressor end of the shaft to seal the lubricating oil. However, gaps can easily exist between the shaft seal and the air seal plate, allowing lubricating oil to leak out.

[0003] In existing technology, workers will fit a sealing ring on the shaft seal and set a cavity between the air seal plate and the impeller. One side of the sealing ring is the cavity between the impeller and the air seal plate, and the impeller delivers gas into the cavity. The other side of the sealing ring is lubricating oil. Workers usually keep the pressure difference on both sides of the sealing ring within a predetermined range to ensure that the sealing ring seals the gap between the shaft seal and the air seal plate and prevents lubricating oil from leaking out from the gap between the shaft seal and the air seal plate.

[0004] However, some gas is lost as it moves through the impeller and cavity, which can easily cause the air pressure at the compressor end to be lower than the oil pressure of the lubricating oil. This can cause the pressure difference on both sides of the sealing ring to exceed the preset range, resulting in lubricating oil leakage and thus poor oil leakage resistance of the turbocharger. Utility Model Content

[0005] The main purpose of this invention is to provide a turbocharger to solve the problem of poor oil leakage resistance of existing turbochargers.

[0006] To achieve the above objectives, this utility model provides a booster, comprising: a rotating shaft; an impeller structure sleeved on the rotating shaft for conveying gas; a sealing structure sleeved on the rotating shaft; an air seal structure sleeved on the sealing structure; a flow cavity formed by the above components, the flow cavity being used to circulate the gas generated by the impeller structure; and an expansion cavity disposed on the air seal structure, the expansion cavity being recessed relative to the surface of the air seal structure forming the flow cavity, and the expansion cavity communicating with the flow cavity.

[0007] Furthermore, the flow cavity includes a first sub-flow cavity and a second sub-flow cavity that are interconnected, and the cavity wall of the expansion cavity includes a first sub-expansion cavity, a second sub-expansion cavity, and a third sub-expansion cavity that are interconnected, with the second sub-expansion cavity located between the first sub-expansion cavity and the third sub-expansion cavity; wherein, the cavity walls of the first sub-expansion cavity, the second sub-expansion cavity, and the third sub-expansion cavity are all arranged in an arc shape.

[0008] Furthermore, the end of the first sub-expansion cavity away from the second sub-expansion cavity is connected to the first sub-flow cavity, and at least a portion of the cavity wall of the first sub-expansion cavity protrudes in the direction toward the third sub-expansion cavity, with the radius R1 of the cavity wall of the first sub-expansion cavity satisfying: 35mm≤R1≤45mm; at least a portion of the cavity wall of the second sub-expansion cavity protrudes in the direction away from the impeller structure, with the radius R2 of the cavity wall of the second sub-expansion cavity satisfying: 35mm≤R2≤45mm; the end of the third sub-expansion cavity away from the second sub-expansion cavity is connected to the second sub-flow cavity, and at least a portion of the cavity wall of the third sub-expansion cavity protrudes in the direction toward the first sub-expansion cavity, with the radius R3 of the cavity wall of the third sub-expansion cavity satisfying: 35mm≤R3≤45mm.

[0009] Furthermore, the sealing structure includes: a first sealing part, sleeved on the rotating shaft; and a second sealing part, sleeved on the first sealing part, to seal the gap between the first sealing part and the air seal structure.

[0010] Furthermore, the pressure P1 on the side of the second sealing part closer to the impeller structure and the pressure P2 on the side of the second sealing part farther from the impeller structure satisfy the condition: P2 < P1.

[0011] Furthermore, the first sealing part has a positioning groove, and at least a portion of the second sealing part is located within the positioning groove.

[0012] Furthermore, there are two second sealing parts, which are arranged along the axial direction of the first sealing part, and both second sealing parts are located in the positioning groove.

[0013] Furthermore, the two second sealing parts are arranged to abut against each other.

[0014] Furthermore, there are two positioning grooves, which are arranged along the axial direction of the first sealing part, and there are two second sealing parts, which are respectively located in the two positioning grooves.

[0015] Furthermore, the first sealing part, the second sealing part, and the gas seal structure are all metal parts.

[0016] The present invention utilizes a turbocharger impeller structure mounted on a rotating shaft for transporting gas. A sealing structure is mounted on the rotating shaft. An air seal structure is mounted on the sealing structure. These components surround each other to form a flow cavity for the gas generated by the impeller structure. An expansion cavity is located on the air seal structure, with its surface recessed relative to the flow cavity surface, and it communicates with the flow cavity. Thus, when the impeller transports gas, the gas generated by the impeller enters the flow cavity. The expansion cavity's design allows the gas to flow smoothly within the flow cavity, continuously applying pressure to at least a portion of the sealing structure. This reduces gas loss during turning, optimizes airflow distribution, and increases the pressure of the gas within the flow cavity on the sealing structure. This ensures a pressure difference across the sealing structure, preventing lubricating oil on the side of the sealing structure away from the flow cavity from leaking to the compressor side of the turbocharger due to reduced gas pressure within the flow cavity. This guarantees the sealing reliability of the sealing structure and the turbocharger's anti-leakage performance, thereby solving the problem of poor anti-leakage performance in existing turbochargers. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A partial structural schematic diagram of an embodiment of the turbocharger according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A magnified view of a portion of the image.

[0020] The above figures include the following reference numerals:

[0021] 10. Shaft;

[0022] 20. Impeller structure;

[0023] 30. Sealing structure; 31. First sealing part; 311. Positioning groove; 32. Second sealing part;

[0024] 40. Air-sealed structure;

[0025] 50. Flow chamber; 51. First sub-flow chamber; 52. Second sub-flow chamber;

[0026] 60. Expansion cavity; 61. First sub-expansion cavity; 62. Second sub-expansion cavity; 63. Third sub-expansion cavity. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] To address the problem of poor oil leakage resistance in existing turbochargers, this application provides a turbocharger.

[0031] like Figure 1 and Figure 2 As shown, the booster includes a shaft 10, an impeller structure 20, a sealing structure 30, a gas seal structure 40, a flow chamber 50, and an expansion chamber 60. The impeller structure 20 is mounted on the shaft 10 for conveying gas. The sealing structure 30 is mounted on the shaft 10. The gas seal structure 40 is mounted on the sealing structure 30. The aforementioned components surround each other to form the flow chamber 50, which is used to circulate the gas generated by the impeller structure 20. The expansion chamber 60 is disposed on the gas seal structure 40, and the expansion chamber 60 is recessed relative to the surface of the gas seal structure 40 forming the flow chamber 50, communicating with the flow chamber 50.

[0032] Using the technical solution of this embodiment, the impeller structure 20 of the booster is sleeved on the rotating shaft 10 for conveying gas. A sealing structure 30 is sleeved on the rotating shaft 10. A gas seal structure 40 is sleeved on the sealing structure 30. The above-mentioned components surround to form a flow cavity 50, which is used to circulate the gas generated by the impeller structure 20. An expansion cavity 60 is disposed on the gas seal structure 40, and the expansion cavity 60 is recessed relative to the surface of the gas seal structure 40 forming the flow cavity 50; the expansion cavity 60 communicates with the flow cavity 50. In this way, when the impeller is conveying gas, the gas generated by the impeller enters the flow chamber 50. At this time, the arrangement of the expansion chamber 60 allows the gas to flow smoothly within the flow chamber 50 and continuously apply pressure to at least part of the sealing structure 30. This reduces gas loss during the turning process, optimizes the airflow distribution, and increases the pressure of the gas in the flow chamber 50 on the sealing structure 30. This ensures the pressure difference between the two sides of the sealing structure 30, preventing the lubricating oil on the side of the sealing structure 30 away from the flow chamber 50 from leaking to the compressor side of the turbocharger due to the decrease in gas pressure within the flow chamber 50. This ensures the sealing reliability of the sealing structure 30 and the oil leakage resistance of the turbocharger, thereby solving the problem of poor oil leakage resistance of turbochargers in the prior art.

[0033] In this embodiment, the impeller structure 20 is the impeller on the compressor side of the booster.

[0034] In this embodiment, the supercharger is a turbocharger, which also includes a turbine, a volute, a compressor housing, a floating bearing, a thrust washer, and an oil baffle. All of these structures are prior art and are not shown in the accompanying drawings.

[0035] like Figure 2 As shown, the flow cavity 50 includes a first sub-flow cavity 51 and a second sub-flow cavity 52 that are interconnected. The expansion cavity 60 includes a first sub-expansion cavity 61, a second sub-expansion cavity 62, and a third sub-expansion cavity 63 that are interconnected. The second sub-expansion cavity 62 is located between the first sub-expansion cavity 61 and the third sub-expansion cavity 63. The walls of the first sub-expansion cavity 61, the second sub-expansion cavity 62, and the third sub-expansion cavity 63 are all arc-shaped. This creates a vortex space around the first sub-expansion cavity 61, the second sub-expansion cavity 62, and the third sub-expansion cavity 63. Gas flowing into this vortex space enters the flow cavity 50 more smoothly, further avoiding direct gas impact and loss, improving gas flow smoothness, and thus increasing the gas pressure within the flow cavity 50, further ensuring the sealing reliability of the sealing structure 30. Meanwhile, the above-mentioned settings reduce stress concentration in the air seal structure 40, extend the service life of the air seal structure 40, and enhance the stability and durability of the overall structure.

[0036] In this embodiment, the extension paths of the first sub-flow cavity 51 and the second sub-flow cavity 52 enable the first sub-flow cavity 51, the expansion cavity 60 and the second sub-flow cavity 52 to provide flow guidance for the gas, optimize the gas flow path, ensure the smooth delivery of the gas, and further ensure the gas pressure in the flow cavity 50, thus ensuring the sealing reliability of the sealing structure 30.

[0037] like Figure 2 As shown, the end of the first sub-expansion cavity 61 away from the second sub-expansion cavity 62 is connected to the first sub-flow cavity 51. At least a portion of the cavity wall of the first sub-expansion cavity 61 protrudes in the direction toward the third sub-expansion cavity 63, and the radius R1 of the cavity wall of the first sub-expansion cavity 61 satisfies: 35mm≤R1≤45mm; at least a portion of the cavity wall of the second sub-expansion cavity 62 protrudes in the direction away from the impeller structure 20, and the radius R2 of the cavity wall of the second sub-expansion cavity 62 satisfies: 35mm≤R2≤45mm; the end of the third sub-expansion cavity 63 away from the second sub-expansion cavity 62 is connected to the second sub-flow cavity 52, and at least a portion of the cavity wall of the third sub-expansion cavity 63 protrudes in the direction toward the first sub-expansion cavity 61, and the radius R3 of the cavity wall of the third sub-expansion cavity 63 satisfies: 35mm≤R3≤45mm. Thus, the specific arc-shaped design of the first sub-expansion cavity 61, the second sub-expansion cavity 62, and the third sub-expansion cavity 63 makes the transition between them smoother, guiding the gas flow and improving its smoothness, further ensuring the gas pressure within the flow cavity 50. Simultaneously, the above-mentioned design also limits the radius setting range of the first sub-expansion cavity 61, the second sub-expansion cavity 62, and the third sub-expansion cavity 63, further optimizing the gas flow path, making the processing of the first sub-expansion cavity 61, the second sub-expansion cavity 62, and the third sub-expansion cavity 63 simpler and more flexible, thus improving the processing flexibility of the operators.

[0038] like Figure 1 As shown, the sealing structure 30 includes a first sealing part 31 and a second sealing part 32. The first sealing part 31 is sleeved on the rotating shaft 10. The second sealing part 32 is sleeved on the first sealing part 31 to seal the gap between the first sealing part 31 and the air-sealing structure 40. Thus, the sealing structure 30 is connected to the rotating shaft 10 through the first sealing part 31 and to the air-sealing structure 40 through the second sealing part 32. Simultaneously, the second sealing part 32 seals the gap between the first sealing part 31 and the air-sealing structure 40, enabling the sealing structure 30 to provide a double seal and enhancing its sealing performance.

[0039] In this embodiment, the first sealing part 31 is a shaft seal.

[0040] In this embodiment, the second sealing part 32 is a sealing ring.

[0041] Specifically, the pressure P1 on the side of the second sealing part 32 near the impeller structure 20 and the pressure P2 on the side of the second sealing part 32 away from the impeller structure 20 satisfy the condition: P2 < P1. Thus, during the flow of lubricating oil, the pressure of the gas in the flow chamber 50 on the second sealing part 32 is always higher than the pressure of the lubricating oil on the second sealing part 32. This prevents the lubricating oil from flowing through the second sealing part 32 to the compressor side of the turbocharger due to excessive pressure, ensuring the sealing reliability of the second sealing part 32, and also ensuring the turbocharger's resistance to oil leakage and operational reliability.

[0042] like Figure 1 As shown, the first sealing part 31 has a positioning groove 311, and at least a portion of the second sealing part 32 is located within the positioning groove 311. This arrangement, on the one hand, allows the operator to determine the installation position of the second sealing part 32 via the positioning groove 311 during installation, improving installation efficiency; on the other hand, it allows the second sealing part 32 to be embedded into the first sealing part 31, ensuring a tight fit between the two parts, and also improving the installation stability and sealing reliability of the second sealing part 32.

[0043] In this embodiment, there are two second sealing portions 32, which are arranged axially along the first sealing portion 31, and both second sealing portions 32 are located within the positioning groove 311. This arrangement balances the pressure exerted on the second sealing portions 32 by the air-sealing structure 40, as well as the pressure exerted on the second sealing portions 32 by the gas and lubricating oil, thus slowing down the wear rate of the second sealing portions 32 and extending their service life. Simultaneously, the arrangement of two second sealing portions 32 also improves the sealing performance of the second sealing portions 32, enhancing the turbocharger's resistance to oil leakage.

[0044] Specifically, the two second sealing parts 32 are arranged in abutment against each other. In this way, the above arrangement not only ensures the sealing performance of the two second sealing parts 32, but also enhances the strength and rigidity of the two second sealing parts 32, further extending the service life of the second sealing parts 32.

[0045] Optionally, there are two positioning grooves 311, which are arranged along the axial direction of the first sealing part 31, and two second sealing parts 32, which are respectively located in the two positioning grooves 311. In this way, the above arrangement is conducive to the installation and positioning of the two second sealing parts 32, and makes the installation and replacement of the two sealing parts more convenient.

[0046] Specifically, the first sealing part 31, the second sealing part 32, and the air seal structure 40 are all metal parts. This configuration allows the first sealing part 31, the second sealing part 32, and the air seal structure 40 to have better durability and wear resistance in harsh working environments, ensuring the operational reliability of the first sealing part 31, the second sealing part 32, and the air seal structure 40, and further guaranteeing the operational reliability and oil leakage resistance of the turbocharger.

[0047] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0048] The impeller structure of the turbocharger is mounted on the rotating shaft for conveying gas. A sealing structure is mounted on the rotating shaft. An air seal structure is mounted on the sealing structure. These components surround each other to form a flow chamber for the gas generated by the impeller structure. An expansion chamber is located on the air seal structure, with its surface recessed relative to the surface forming the flow chamber, and it communicates with the flow chamber. Thus, when the impeller conveys gas, the gas generated by the impeller enters the flow chamber. The expansion chamber's design allows the gas to flow smoothly within the flow chamber, continuously applying pressure to at least a portion of the sealing structure. This reduces gas loss during turning, optimizes airflow distribution, and increases the pressure of the gas within the flow chamber on the sealing structure. This ensures a pressure difference across the sealing structure, preventing lubricating oil on the side of the sealing structure away from the flow chamber from leaking to the compressor side of the turbocharger due to reduced gas pressure within the flow chamber. This guarantees the sealing reliability of the sealing structure and the turbocharger's anti-leakage performance, thereby solving the problem of poor anti-leakage performance in existing turbochargers.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A booster, characterized in that, include: Rotating shaft (10); An impeller structure (20) is fitted onto the rotating shaft (10) for conveying gas; A sealing structure (30) is sleeved on the rotating shaft (10); An air-sealing structure (40) is fitted onto the sealing structure (30); The aforementioned components surround each other to form a flow cavity (50), which is used to circulate the gas generated by the impeller structure (20); An expansion cavity (60) is disposed on the gas seal structure (40). The expansion cavity (60) is recessed relative to the gas seal structure (40) to form the surface of the flow cavity (50). The expansion cavity (60) is in communication with the flow cavity (50).

2. The booster according to claim 1, characterized in that, The flow cavity (50) includes a first sub-flow cavity (51) and a second sub-flow cavity (52) that are interconnected. The expansion cavity (60) includes a first sub-expansion cavity (61), a second sub-expansion cavity (62) and a third sub-expansion cavity (63) that are interconnected. The second sub-expansion cavity (62) is located between the first sub-expansion cavity (61) and the third sub-expansion cavity (63). The walls of the first sub-expansion cavity (61), the second sub-expansion cavity (62), and the third sub-expansion cavity (63) are all arc-shaped.

3. The booster according to claim 2, characterized in that, The end of the first sub-expansion cavity (61) away from the second sub-expansion cavity (62) is connected to the first sub-flow cavity (51). At least part of the cavity wall of the first sub-expansion cavity (61) protrudes in the direction toward the third sub-expansion cavity (63). The radius R1 of the cavity wall of the first sub-expansion cavity (61) satisfies: 35mm≤R1≤45mm. At least a portion of the cavity wall of the second sub-expansion cavity (62) protrudes in a direction away from the impeller structure (20), and the radius R2 of the cavity wall of the second sub-expansion cavity (62) satisfies: 35mm≤R2≤45mm; The third sub-expansion cavity (63) is connected to the second sub-flow cavity (52) at one end away from the second sub-expansion cavity (62). At least part of the cavity wall of the third sub-expansion cavity (63) protrudes in the direction toward the first sub-expansion cavity (61). The radius R3 of the cavity wall of the third sub-expansion cavity (63) satisfies: 35mm≤R3≤45mm.

4. The booster according to claim 1, characterized in that, The sealing structure (30) includes: The first sealing part (31) is sleeved on the rotating shaft (10); The second sealing part (32) is sleeved on the first sealing part (31) to seal the gap between the first sealing part (31) and the air seal structure (40).

5. The booster according to claim 4, characterized in that, The pressure P1 on the side of the second sealing part (32) near the impeller structure (20) and the pressure P2 on the side of the second sealing part (32) away from the impeller structure (20) satisfy the condition: P2 < P1.

6. The booster according to claim 4, characterized in that, The first sealing part (31) has a positioning groove (311), and at least a portion of the second sealing part (32) is located within the positioning groove (311).

7. The booster according to claim 6, characterized in that, There are two second sealing parts (32), which are arranged along the axial direction of the first sealing part (31) and are both located in the positioning groove (311).

8. The booster according to claim 7, characterized in that, The two second sealing parts (32) are arranged to abut against each other.

9. The booster according to claim 6, characterized in that, There are two positioning grooves (311), which are arranged along the axial direction of the first sealing part (31). There are two second sealing parts (32), which are located in the two positioning grooves (311) respectively.

10. The booster according to claim 4, characterized in that, The first sealing part (31), the second sealing part (32) and the gas sealing structure (40) are all metal parts.

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