CN217055298U - Shaft end sealing structure of turbocharger - Google Patents
Shaft end sealing structure of turbocharger Download PDFInfo
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- CN217055298U CN217055298U CN202220725348.7U CN202220725348U CN217055298U CN 217055298 U CN217055298 U CN 217055298U CN 202220725348 U CN202220725348 U CN 202220725348U CN 217055298 U CN217055298 U CN 217055298U
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Abstract
The utility model belongs to the technical field of turbo charger, a turbo charger axle head seal structure is related to, set up in the hole of bearing frame, include: the rotor component is rotationally arranged in the inner hole of the bearing seat and comprises a turbine rotating shaft, a shaft seal and a fixed sleeve, wherein the shaft seal and the fixed sleeve are fixed on the turbine rotating shaft; the oil sealing cover is connected to the end face of the bearing seat in a sealing manner, and dynamic seal is formed between the shaft seal and the oil sealing cover; the axial positioning assembly comprises a fixed sleeve and a thrust bearing, wherein the fixed sleeve is arranged on the turbine rotating shaft in a limiting mode, the thrust bearing is arranged on the bearing seat, and the thrust bearing is used for axially positioning the fixed sleeve and the shaft seal; the oil baffle is arranged in the step hole of the oil sealing cover, a dynamic seal is formed between the inner hole of the oil baffle and the shaft seal, the oil baffle is provided with an integrally connected guide plate, and the guide plate is bent and extends into an oil return cavity of the bearing seat. The sealing structure can effectively improve the oil sealing capacity of the pressure end of the supercharger, and ensures that the supercharger does not leak oil for a long time under the condition that the positive pressure difference or the negative pressure is not generated on the two sides of the sealing structure.
Description
Technical Field
The utility model belongs to the technical field of turbo charger, a turbo charger axle head seal structure is related to.
Background
Turbochargers are important devices for increasing power and reducing fuel consumption of modern engines, and generally consist of a turbine, a compressor and a bearing system. The turbine rotates at a high speed by utilizing the exhaust energy of the engine, the turbine drives the coaxially connected compressor to operate, the compressor compresses air and then conveys the air into the engine cylinder, the air inflow of the engine is improved, the combustion in the engine cylinder is more sufficient and efficient, and therefore the power performance and the economical efficiency of the engine are improved. The bearing system, which is used to support the shaft rotating at high speed, is mounted in the center housing of the supercharger, which connects the turbine housing and the compressor housing. In order to ensure the stable operation of the shaft of the supercharger at high rotation speed, the bearing system needs to have sufficient engine oil for lubrication and cooling, and in order to prevent the lubricating oil from leaking to the gas circulation part of the supercharger, the shaft end oil sealing mechanism needs to have good dynamic sealing capability. Under most working conditions of the engine, the compressor end and the turbine end of the supercharger have certain pressure, the supercharger oil return cavity is communicated with a crankcase of the engine, and the lubricating oil side of the shaft end sealing structure basically has no pressure or very small crankcase pressure, so that positive pressure pointing to the lubricating oil side from the gas side is formed on two sides of the shaft end sealing structure, and lubricating oil is basically not leaked out. However, under some special engine working conditions, such as long-time idling of the engine, air filter blockage causes large air inlet negative pressure, or under the condition of back dragging, the pressure of the compressor end is very low or negative pressure is formed, so that positive pressure pointing to one side of lubricating oil from the air side cannot be formed on two sides of the sealing structure of the compressor end, and negative pressure can be formed under partial limit working conditions, so that a large amount of lubricating oil leaks to the compressor end, and the efficiency of the supercharger and the performance of the engine are influenced. The oil sealing structure of the conventional shaft seal sleeve and the sealing ring is limited to design and space arrangement reasons, and can only ensure that the supercharger can not leak oil under the conventional working condition, and oil leakage can occur or can directly occur within a short time under the condition that the two sides of the shaft end sealing structure are not provided with positive pressure difference or negative pressure.
Disclosure of Invention
The utility model provides an above-mentioned problem, provide a turbo charger axle head seal structure, this seal structure can the effectual pressure end oil-sealing ability that promotes the booster, guarantees that the booster does not have forward pressure differential or for not leaking oil for a long time under the condition of negative pressure in seal structure both sides.
According to the technical scheme of the utility model: the utility model provides a turbo charger axle head seal structure, sets up in the hole of bearing frame, its characterized in that includes: the rotor component is rotationally arranged in the inner hole of the bearing seat and comprises a turbine rotating shaft, a shaft seal and a fixed sleeve, wherein the shaft seal and the fixed sleeve are fixed on the turbine rotating shaft;
the oil sealing cover is connected to the end face of the bearing seat in a sealing manner, and dynamic seal is formed between the shaft seal and the oil sealing cover;
the axial positioning assembly comprises a fixed sleeve and a thrust bearing, the fixed sleeve is arranged on the turbine rotating shaft in a limiting mode, the thrust bearing is arranged on the bearing seat, and the thrust bearing is used for axially positioning the fixed sleeve and the shaft seal;
the oil baffle is arranged in the step hole of the oil sealing cover, a dynamic seal is formed between the inner hole of the oil baffle and the shaft seal, the oil baffle is provided with an integrally connected guide plate, and the guide plate is bent and extends into an oil return cavity of the bearing seat.
As a further improvement of the present invention, one end of the shaft seal close to the axial positioning component is provided with a radially extending outer edge protrusion, and the outer edge protrusion is provided with an annular protrusion facing the surface of one side of the oil seal cover;
the inner hole of the oil baffle plate is arranged on the step formed by the outer edge bulge and the annular bulge in a matching way.
As a further improvement, the inner ring of the oil seal cover is close to one end of the axial positioning component and is provided with a flanging, and the flanging periphery and the inner hole of the annular bulge form clearance fit.
As the utility model discloses a further improvement, set up twice sealed annular, per on the bearing seal set up the sealing ring in the sealed annular respectively, sealing ring and the sealed cooperation between the oil blanket.
As a further improvement, an O-shaped ring is arranged between the step surface of the oil sealing cover and the step hole of the bearing seat.
The technical effects of the utility model reside in that: the product of the utility model has reasonable and ingenious structure, the oil baffle plate is arranged at the front end of the sealing structure, the lubrication is blocked and guided to the oil return cavity, the flow of the lubricating oil to the sealing ring can be effectively reduced through the zigzag gap, the oil sealing capability is strong, and the oil does not leak for a long time under the condition that the positive pressure difference or the negative pressure is not formed at the two sides of the sealing structure; the utility model discloses the product is convenient for produce and is made, and the part dependable performance is longe-lived.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a usage state diagram of the present invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
In the figures 1 and 2, the oil seal device comprises an oil seal cover 1, a flanging 1-1, a shaft seal 2, a seal ring groove 2-1, an annular bulge 2-2, an outer edge bulge 2-3, a seal ring 3, an oil baffle plate 4, a flow guide plate 4-1, an oil return cavity 5, a thrust bearing 6, a turbine rotating shaft 7, a bearing seat 8, an O-shaped ring 9, a fixed sleeve 10 and the like.
As shown in fig. 1 and 2, the utility model relates to a shaft end sealing structure of turbocharger, which is arranged in the inner hole of a bearing seat 8, and comprises a rotor part which is arranged in the inner hole of the bearing seat 8 in a rotating way, wherein the rotor part comprises a turbine rotating shaft 7 and a shaft seal 2 and a fixed sleeve 10 which are fixed on the turbine rotating shaft 7.
The end face of the bearing seat 8 is connected with the oil sealing cover 1 in a sealing mode, and dynamic sealing is formed between the shaft seal 2 and the oil sealing cover 1.
As shown in fig. 1, in order to axially position the rotor, an axial positioning assembly is further disposed on the turbine rotating shaft 1 in a matching manner, the axial positioning assembly includes a fixed sleeve 10 disposed on the turbine rotating shaft 7 in a limiting manner and a thrust bearing 6 mounted on a bearing seat 8, and the thrust bearing 6 axially positions the fixed sleeve 10 and the shaft seal 2.
In order to prevent the lubricating oil from flowing to the outer side of the oil sealing cover 1 along the axial direction, an oil baffle plate 4 is arranged in a step hole of the oil sealing cover 1, a dynamic seal is formed between an inner hole of the oil baffle plate 4 and the shaft seal 2, the oil baffle plate 4 is provided with a guide plate 4-1 which is integrally connected, and the guide plate 4-1 bends and extends into an oil return cavity 5 of the bearing seat 8.
One end of the shaft seal 2 close to the axial positioning component is provided with a radially extending outer edge bulge 2-3, and the surface of one side of the outer edge bulge 2-3, which faces the oil seal cover 1, is provided with an annular bulge 2-2; the inner hole of the oil baffle plate 4 is arranged on the step formed by the outer edge bulge 2-3 and the annular bulge 2-2 in a matching way.
One end of the inner ring of the oil seal cover 1, which is close to the axial positioning component, is provided with a flanging 1-1, and the circumferential surface of the flanging 1-1 is in clearance fit with the inner hole of the annular bulge 2-2.
The shaft seal 2 is provided with two sealing ring grooves 2-1, each sealing ring groove 2-1 is internally provided with a sealing ring 3, and the sealing rings 3 are in sealing fit with the oil sealing cover 1.
An O-shaped ring 9 is arranged between the step surface of the oil sealing cover 1 and the step hole of the bearing seat 8.
As shown in fig. 1 and 2, the utility model discloses at the during operation, at the booster operation in-process, when lubricating oil flows through the clearance between footstep bearing 6 and the bearing seal 2, because adopted tortuous "Z" shape clearance fit between the hole of oil baffle 4 and the bearing seal 2, because of the throttle effect, most lubricating oil can be blocked by oil baffle 4 and flow to returning oil cavity 9 through guide plate 4-1 drainage of lower part, only a small amount of lubricating oil flows to oil seal cover 1 one side along this clearance. A part of the small amount of lubricating oil which flows out directly flows to the oil return cavity 9 due to the action of gravity, and a part of the small amount of lubricating oil flows to the oil return cavity 9 along the annular groove formed by the oil seal cover flanging 1-1. Meanwhile, the flanging 1-1 and the annular bulge 2-1 on the shaft seal 2 form barb-shaped clearance fit, so that a lubricating oil leakage path entering the sealing clearance is lengthened and is not easy to flow out. Meanwhile, the two sealing rings 3 arranged on the shaft seal 1 can also effectively prevent the lubricating oil from leaking. Therefore, even if the two sides of the sealing structure are not provided with positive pressure difference or negative pressure, the long-time oil leakage prevention can be ensured, and the oil leakage resistance is greatly improved compared with the existing structure.
Claims (5)
1. The utility model provides a turbo charger axle head seal structure, sets up in the hole of bearing frame (8), its characterized in that includes: the rotor part is rotationally arranged in an inner hole of the bearing seat (8) and comprises a turbine rotating shaft (7), a shaft seal (2) fixed on the turbine rotating shaft (7) and a fixed sleeve (10);
the oil sealing cover (1) is connected to the end face of the bearing seat (8) in a sealing manner, and dynamic seal is formed between the shaft seal (2) and the oil sealing cover (1);
the axial positioning assembly comprises a fixed sleeve (10) which is arranged on the turbine rotating shaft (7) in a limiting mode and a thrust bearing (6) which is arranged on the bearing seat (8), and the thrust bearing (6) is used for axially positioning the fixed sleeve (10) and the shaft seal (2);
the oil baffle plate (4) is arranged in a step hole of the oil sealing cover (1), a dynamic seal is formed between the inner hole of the oil baffle plate (4) and the shaft seal (2), the oil baffle plate (4) is provided with an integrally connected guide plate (4-1), and the guide plate (4-1) bends and extends into an oil return cavity (5) of the bearing seat (8).
2. The turbocharger shaft end sealing structure as recited in claim 1, wherein: one end of the shaft seal (2) close to the axial positioning component is provided with a radially extending outer edge bulge (2-3), and the surface of one side of the outer edge bulge (2-3) facing the oil seal cover (1) is provided with an annular bulge (2-2);
the inner hole of the oil baffle plate (4) is arranged on the step formed by the outer edge bulge (2-3) and the annular bulge (2-2) in a matching way.
3. The turbocharger shaft end sealing structure as recited in claim 2, wherein: one end of the inner ring of the oil seal cover (1), which is close to the axial positioning component, is provided with a flanging (1-1), and the circumferential surface of the flanging (1-1) is in clearance fit with the inner hole of the annular bulge (2-2).
4. The turbocharger shaft end sealing structure according to claim 1, wherein: the oil seal is characterized in that two sealing ring grooves (2-1) are formed in the shaft seal (2), each sealing ring groove (2-1) is internally provided with a sealing ring (3), and the sealing rings (3) are in sealing fit with the oil seal cover (1).
5. The turbocharger shaft end sealing structure according to claim 1, wherein: an O-shaped ring (9) is arranged between the step surface of the oil sealing cover (1) and the step hole of the bearing seat (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220725348.7U CN217055298U (en) | 2022-03-30 | 2022-03-30 | Shaft end sealing structure of turbocharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220725348.7U CN217055298U (en) | 2022-03-30 | 2022-03-30 | Shaft end sealing structure of turbocharger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217055298U true CN217055298U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220725348.7U Active CN217055298U (en) | 2022-03-30 | 2022-03-30 | Shaft end sealing structure of turbocharger |
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| CN (1) | CN217055298U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929680A (en) * | 2023-03-13 | 2023-04-07 | 宁波威孚天力增压技术股份有限公司 | Shafting assembly of ball bearing turbocharger |
-
2022
- 2022-03-30 CN CN202220725348.7U patent/CN217055298U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929680A (en) * | 2023-03-13 | 2023-04-07 | 宁波威孚天力增压技术股份有限公司 | Shafting assembly of ball bearing turbocharger |
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