A turbine based blisk oil seal structure

Abstract

The utility model relates to a kind of vortex end lubricating oil sealing structure based on turbocharger, including intermediate body, oil baffle, turbine shaft and ball bearing, the oil baffle is embedded in the middle body hole bottom with interference;The interference fit of the oil baffle and intermediate body makes the oil baffle can withstand high temperature and high pressure environment.Ball bearing is placed in oil baffle end face;The turbine shaft is inserted by vortex end cover, placed in the ball bearing end face;The oil baffle middle partition surface and turbine shaft cooperation surface are provided with gap after assembly, and the oil baffle is provided with rectangular gap.The vortex end lubricating oil sealing structure of the new type, the material, structure and assembly mode of oil baffle are designed to limit, ensure that the structure is stable under extreme high temperature working condition;And the optimized structure with gap, ensure that oil baffle does not contact with rotating fittings, effectively avoid wear and seal failure due to dynamic condition;Prolong the service life of turbocharger, provide more stable, efficient supercharging performance for engine.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a turbine end lubricating oil sealing structure based on a turbocharger. Background Technology

[0002] As a key component for improving engine intake efficiency, the turbocharger's intermediate body plays a crucial role in connecting the compressor and turbine, supporting the rotating shaft system, and managing the lubrication system. The turbine end seal is critical to preventing lubricating oil from leaking from the intermediate body to the high-temperature turbine side, and its performance directly affects the turbocharger's reliability and service life.

[0003] However, the harsh working environment at the turbine end leads to the following common technical defects in existing sealing structures: high-temperature oxidation and material degradation. The turbine end is constantly exposed to high-temperature exhaust gases. If the materials of sealing components (such as oil baffles) have insufficient high-temperature resistance, they are prone to high-temperature oxidation, resulting in degradation of mechanical properties, deformation, or even failure. This damages the integrity of the sealing structure and causes lubricating oil leakage. Seal failure under dynamic operating conditions: During turbocharger start-up, shutdown, and operation under varying conditions, contact or fretting may occur between rotating and stationary components. This causes wear on contact-type sealing structures, changes in sealing gaps, and ultimately, seal failure and lubricating oil leakage. Therefore, solving these problems has become a key issue in the current development of turbine end lubricating oil sealing structures.

[0004] Therefore, there is a need for a turbocharger vortex end lubricating oil sealing structure that can withstand high-temperature environments, maintain stable non-contact sealing under dynamic operating conditions, and does not affect the overall lubrication effect and efficiency of the mechanism. Utility Model Content

[0005] To solve the above technical problems, this utility model provides a turbine end lubricating oil sealing structure based on a turbocharger, including an intermediate body, an oil baffle plate, a turbine shaft, and a ball bearing. The oil baffle plate is made of stainless steel and is interference-fitted into the bottom of the central hole of the intermediate body. The interference fit between the oil baffle plate and the intermediate body enables the oil baffle plate to withstand high temperature and high pressure environments.

[0006] The ball bearing is placed on the end face of the oil baffle; the turbine shaft is inserted from the vortex end and placed on the end face of the ball bearing; the middle partition of the oil baffle and the mating surface of the turbine shaft are provided with a gap after assembly, and the oil baffle is provided with a rectangular notch.

[0007] In one embodiment of this utility model, the oil baffle does not come into contact with the rotating components under the dynamic operating conditions of the turbocharger.

[0008] In one embodiment of the present invention, the rectangular notch of the oil baffle is located on the side facing the oil return chamber, guiding the lubricating oil to the oil return chamber.

[0009] In one embodiment of this utility model, the smaller gap between the intermediate section of the oil baffle and the mating surface of the turbine shaft is 0.05-0.1mm.

[0010] In one embodiment of this utility model, the turbine end lubricating oil sealing structure further includes a sealing ring disposed at the turbine end for secondary sealing of lubricating oil that fails to flow back.

[0011] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The vortex end lubricating oil sealing structure of this utility model is designed with limitations on the material, structure and assembly method of the oil baffle to ensure structural stability under extreme high temperature conditions and prevent sealing failure due to thermal expansion. In addition, the optimized structure with gaps ensures that the oil baffle does not contact the rotating parts under high-speed rotation (200,000 rpm) and temperature changes, effectively avoiding wear and sealing failure caused by dynamic conditions. Furthermore, the notch design reduces turbulence and bubble formation, further optimizes lubricating oil flow, prevents lubricating oil from accumulating at the seal, and prevents the sealing performance from deteriorating. Therefore, it solves the problem of turbocharger vortex end sealing, extends the service life of turbochargers, and provides the engine with more stable and efficient boosting performance. Attached Figure Description

[0012] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0013] Figure 1 This is a cross-sectional schematic diagram of the turbine end lubricating oil sealing structure based on the present invention for a turbocharger;

[0014] Figure 2 This is a schematic diagram of the structure of the oil baffle plate described in this utility model.

[0015] As shown in the figure, 1. Oil baffle; 2. Intermediate body; 3. Turbine shaft; 4. Ball bearing. Detailed Implementation

[0016] like Figure 1 and Figure 2 As shown, this embodiment provides a turbine end lubricating oil sealing structure based on a turbocharger, mainly composed of an oil baffle plate 1, an intermediate body 2, a turbine shaft 3, and a ball bearing 4. Specifically... Figure 1 The sectional view is obtained by cutting the turbine shaft 3 component with a symmetrical plane after the turbocharger is assembled.

[0017] The oil baffle 1 is preferably made of stainless steel (such as 304 or 316 stainless steel) through precision stamping or turning processes, which gives it excellent resistance to high temperature oxidation and structural strength, sufficient to cope with the harsh high temperature and high pressure working environment at the turbine end.

[0018] During assembly, the oil baffle 1 is first pressed into and fixed to the bottom of the central hole of the intermediate body 2 by interference fit of its outer circumference. This assembly method is simple in structure, reliable in connection, easy to implement, and can effectively improve production assembly efficiency. Subsequently, the ball bearing 4 is placed on the end face of the oil baffle 1. Finally, the turbine shaft 3 is inserted from the turbine end, with its end supported on the end face of the ball bearing 4, thus completing the assembly of the entire movement and forming a complete sealing structure.

[0019] The core of this embodiment lies in the unique structure and arrangement of the oil baffle 1. The oil baffle 1 has an integrally formed partition surface in its center. A very small radial clearance (e.g., a design clearance range of 0.05mm to 0.1mm) is pre-set between this partition surface and the mating surface of the turbine shaft 3. This design ensures that the oil baffle 1 and the turbine shaft 3 do not directly contact each other under both static and dynamic operating conditions, fundamentally avoiding wear failure caused by contact friction, and significantly improving the service life and reliability of the sealing structure under high-speed variable operating conditions.

[0020] The working principle and lubricating oil return path of this utility model are as follows:

[0021] Oil return flow in the bearing outer ring: The main oil flow from the internal lubrication passage of the intermediate body 2 to the volute end is divided into two parts. One part flows through the bearing outer ring, passing through the annular groove located on the end face of the oil baffle plate 1 on the intermediate body 2. Figure 2 As shown, the oil is directly guided to the return oil chamber below.

[0022] Oil return flow in the bearing inner raceway: Another portion of the lubricating oil enters the bearing inner raceway. During the high-speed operation of the ball bearing 4, this portion of lubricating oil is thrown out and splashes onto the partition surface of the oil baffle 1. Under the combined action of centrifugal force and gravity, the oil flows along the inclined surface of the partition surface and eventually flows into the rectangular notch provided at the lower part of the oil baffle 1, and thus smoothly flows into the return oil chamber.

[0023] Cooling and auxiliary return flow function of the gap: The small gap between the partition and the turbine shaft 3 allows a very small amount of lubricating oil to pass through. This portion of lubricating oil plays a crucial role in cooling the root of the high-speed rotating turbine shaft 3. On the other hand, under the action of centrifugal force and gravity, it is also thrown towards and flows into the rectangular notch facing the oil return chamber, rather than flowing in large quantities towards the turbine end.

[0024] Secondary sealing guarantee: Even under extreme operating conditions, if a very small amount of lubricating oil overflows the oil baffle 1, it will be blocked by the sealing ring already present at the turbine end, thus achieving a secondary sealing effect and ensuring the final sealing reliability.

[0025] In summary, the vortex end lubricating oil sealing structure provided in this embodiment not only effectively solves the sealing failure problem caused by high-temperature oxidation and dynamic wear through the non-contact oil baffle design, but also ensures the overall lubrication effect and cooling requirements of the mechanism through reasonable oil circuit design, without negatively affecting the operating efficiency of the turbocharger.

[0026] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A turbine end lubricating oil sealing structure based on a turbocharger, characterized in that: The device includes an intermediate body, an oil baffle, a turbine shaft, and a ball bearing. The oil baffle is made of stainless steel and is interference-fitted into the bottom of the central hole of the intermediate body. The ball bearing is placed on the end face of the oil baffle. The turbine shaft is inserted from the vortex end and placed on the end face of the ball bearing. The intermediate section of the oil baffle and the mating surface of the turbine shaft have a gap after assembly, and the oil baffle has a rectangular notch.

2. The vortex end lubricating oil sealing structure according to claim 1, characterized in that: The oil baffle does not come into contact with rotating components under the dynamic operating conditions of the turbocharger.

3. The vortex end lubricating oil sealing structure according to claim 1, characterized in that: The rectangular notch of the oil baffle is located on the side facing the oil return chamber.

4. The vortex end lubricating oil sealing structure according to claim 1, characterized in that: The minimum clearance between the intermediate section of the oil baffle and the mating surface of the turbine shaft is 0.05-0.1mm.

5. The vortex end lubricating oil sealing structure according to claim 1, characterized in that: The turbine end lubricating oil sealing structure also includes a sealing ring, which is disposed at the turbine end.

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