CN120576120A - Turbocharger compressor anti-negative pressure oil leakage structure - Google Patents
Turbocharger compressor anti-negative pressure oil leakage structureInfo
- Publication number
- CN120576120A CN120576120A CN202511093124.3A CN202511093124A CN120576120A CN 120576120 A CN120576120 A CN 120576120A CN 202511093124 A CN202511093124 A CN 202511093124A CN 120576120 A CN120576120 A CN 120576120A
- Authority
- CN
- China
- Prior art keywords
- cavity
- negative pressure
- seal
- impeller sleeve
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/14—Lubrication of pumps; Safety measures therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
Abstract
The utility model provides an anti negative pressure oil leak structure of turbo charger compressor, relate to internal-combustion engine supercharging device technical field, including rotating the bearing seal that sets up, the outside cover of bearing seal is equipped with the impeller seat that sets up fixedly, is equipped with mechanical seal one and mechanical seal two along the axial between the surface of bearing seal and the hole of impeller seat, is equipped with the radial extension section of bearing seal that is the annular setting on the bearing seal, is equipped with the protruding section of impeller seat that is the annular setting on the impeller seat, the protruding section cladding bearing seal of impeller seat is radial extension section, is equipped with mechanical seal three between the protruding section of impeller seat and the radial extension section of bearing seal. The invention solves the problem that lubricating oil sprayed from the gap between the thrust bearing and the bearing surface of the shaft seal in the prior art can enter the cavity II under the negative pressure suction effect of the radial gap, then enter the mechanical sealing structure and then enter the flow passage of the air compressor, so that negative pressure failure resistance is caused.
Description
Technical Field
The invention relates to the technical field of supercharging devices of internal combustion engines, in particular to a negative pressure oil leakage resistant structure of a turbocharger compressor.
Background
The turbocharging technology is widely applied to various internal combustion engines as an important technical measure for energy conservation and carbon reduction of the internal combustion engines. The turbocharger generally comprises a turbine, a bearing body and a compressor, wherein the compressor is required to be provided with a negative pressure resistant structure for preventing lubricating oil from entering a compressor runner from a bearing cavity, so as to avoid the problems of increased engine oil loss, blockage of an intercooler, carbon deposition of a cylinder and the like caused by engine oil entering the compressor runner and being sucked into the cylinder of the engine for combustion.
As shown in fig. 1, in order to reduce the possibility of lubricating oil entering the compressor runner as much as possible, besides the mechanical seal structure 100, the oil baffle 80 and the shaft seal 90 are used to form a dynamic and static seal structure, the oil baffle 80 is used to divide the cavity into a first cavity 110 and a second cavity 120 for reducing the oil channeling area, and since the supercharger needs to avoid rubbing the shaft seal 90 with the oil baffle 80 in a rotating state during operation, a radial gap 130 is necessarily required to be reserved between the oil baffle 80 and the shaft seal 90, and the radial gap 130 is communicated with the first cavity 110 and the second cavity 120.
The prior art including the above devices, as it is used, gradually exposes the disadvantages of the technology, mainly in the following aspects:
Because the mechanical seal structure and the radial gap are of a serial gas circuit structure, after the negative pressure of the compressor runner is high to a certain degree, the strong suction force of the mechanical seal structure and the radial gap is also necessarily acted on the radial gap, so that lubricating oil sprayed from the gap between the thrust bearing and the bearing surface of the shaft seal enters the cavity II under the negative pressure suction effect of the radial gap, then enters the mechanical seal structure and then enters the compressor runner, and negative pressure failure is caused.
In summary, it is clear that the prior art has inconvenience and defects in practical use, so that improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention solves the problem that lubricating oil sprayed from the gap between the thrust bearing and the bearing surface of the shaft seal in the prior art can enter the cavity II under the negative pressure suction effect of the radial gap, then enter the mechanical sealing structure and then enter the flow passage of the air compressor to cause negative pressure failure resistance.
In order to solve the problems, the invention provides the following technical scheme:
The negative pressure oil leakage resistant structure of the turbocharger compressor comprises a shaft seal which is rotationally arranged, an impeller sleeve seat which is fixedly arranged is sleeved outside the shaft seal, a first mechanical seal and a second mechanical seal are axially arranged between the outer surface of the shaft seal and an inner hole of the impeller sleeve seat,
The radial extension section of the shaft seal is arranged on the shaft seal in an annular mode, the protruding section of the impeller sleeve seat is arranged on the impeller sleeve seat in an annular mode, the protruding section of the impeller sleeve seat is coated on the radial extension section of the shaft seal, and the mechanical seal III is arranged between the protruding section of the impeller sleeve seat and the radial extension section of the shaft seal.
As an optimized scheme, the impeller sleeve seat is fixedly connected with an oil baffle plate, the inner cavity of the impeller sleeve seat is divided into a first cavity and a second cavity through the oil baffle plate, and a third cavity is formed among the impeller sleeve seat, the protruding section of the impeller sleeve seat, the shaft seal and the shaft seal radial extension section.
As an optimized scheme, the position of the protruding section of the impeller sleeve seat at the lower end is provided with a vent hole for communicating the third cavity with the second cavity, the lower end of the oil baffle is provided with an oil baffle flat section gap, and the first cavity is communicated with the second cavity through the oil baffle flat section gap.
As an optimized scheme, a first cavity opening which is communicated with the first cavity and the oil return cavity of the bearing body is formed in the first cavity, and a second cavity opening which is communicated with the second cavity and the oil return cavity of the bearing body is formed in the second cavity.
As an optimized scheme, the height of the notch of the flat section of the oil baffle is more than 10mm lower than the lower edge of the vent hole.
As an optimized scheme, the notch of the flat section of the oil baffle is obliquely and downwards fixedly connected with an oil baffle guide section, and the oil baffle guide section extends to the oil return cavity of the bearing body.
As an optimized scheme, the impeller sleeve seat is provided with an air supplementing channel communicated with the cavity III, and the inlet end of the air supplementing channel is connected with a pressure air source.
As an optimized scheme, the inlet end of the air supplementing channel is connected with an air supplementing pipe in an interference mode, and the inlet end of the air supplementing pipe extends out of the bearing shell and is connected with a pressure air source.
As an optimized scheme, the mechanical seal I and the mechanical seal II comprise a seal ring groove I and a seal ring groove II which are correspondingly arranged on the shaft seal, a seal ring I and a seal ring II are correspondingly sleeved in the seal ring groove I and the seal ring groove II, and the outer rings of the seal ring I and the seal ring II are tightly connected with the inner hole of the impeller sleeve seat through radial elastic pretightening force.
As an optimized scheme, the mechanical seal III comprises a seal ring groove III arranged on the shaft seal radial extension section, a seal ring III is sleeved in the seal ring groove III, and the outer ring of the seal ring III is tightly connected with the impeller sleeve seat convex section through radial elastic pretightening force.
Compared with the prior art, the invention has the beneficial effects that:
Compared with the existing structure, the mechanical seal III and the vent holes at the bottom of the cavity III are added, so that no obvious pressure difference exists between the cavity III and the cavity I, and the possibility that lubricating oil in the cavity I enters the cavity III is reduced, wherein the height of a notch of a flat section of the oil baffle is more than 10mm lower than the lower edge of the vent hole, so that weak air suction effect in the cavity III is ensured to suck lubricating oil very difficultly, and the possibility that lubricating oil in the cavity I enters the cavity III is basically isolated, and therefore, the negative pressure oil leakage resistance of the turbocharger compressor is greatly improved;
the invention fundamentally changes the pressure series connection relation among the mechanical seal I, the mechanical seal II and the dynamic and static sealing structure in the prior art, realizes the isolation of the negative pressure suction effect and the lubricating oil through the mechanical seal III and the cavity III, and the newly proposed structure for resisting negative pressure oil leakage has the characteristics of simple structure and lower cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic diagram of a first embodiment of the present invention;
FIG. 3 is a schematic perspective view of a first embodiment of the present invention;
FIG. 4 is a schematic view of the structure of the oil baffle plate of the present invention;
fig. 5 is a schematic structural diagram of a second embodiment of the present invention.
In the figure, the impeller comprises a 1-impeller sleeve seat, a 2-shaft seal, a 3-oil baffle, a 4-cavity I, a 5-cavity II, a 6-cavity III, a 7-impeller sleeve seat protruding section, an 8-shaft seal radial extension section, a 9-mechanical seal I, a 10-mechanical seal II, a 11-mechanical seal III, a 12-vent hole, a 13-oil baffle flat section notch, a 14-oil baffle guide section, a 15-bearing body oil return cavity, a 16-cavity I opening, a 17-cavity II opening, a 18-thrust bearing, a 19-shaft seal bearing surface, a 20-air supplementing channel, a 21-air supplementing pipe and a 22-impeller.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
In a first embodiment of the present invention,
As shown in fig. 2 to 4, the negative pressure oil leakage resistant structure of the turbocharger compressor comprises a shaft seal 2 which is rotatably arranged, an impeller sleeve seat 1 which is fixedly arranged is sleeved outside the shaft seal 2, a mechanical seal I9 and a mechanical seal II 10 are arranged between the outer surface of the shaft seal 2 and an inner hole of the impeller sleeve seat 1 along the axial direction,
The shaft seal 2 is provided with a shaft seal radial extension section 8 which is annularly arranged, the impeller sleeve seat 1 is provided with an impeller sleeve seat protruding section 7 which is annularly arranged, the impeller sleeve seat protruding section 7 coats the shaft seal radial extension section 8, and a mechanical seal three 11 is arranged between the impeller sleeve seat protruding section 7 and the shaft seal radial extension section 8.
The impeller sleeve seat 1 is fixedly connected with an oil baffle plate 3, the inner cavity of the impeller sleeve seat 1 is divided into a first cavity 4 and a second cavity 5 through the oil baffle plate 3, and a third cavity 6 is formed among the impeller sleeve seat 1, the impeller sleeve seat bulge section 7, the shaft seal 2 and the shaft seal radial extension section 8.
The position of the protruding section 7 of the impeller sleeve seat at the lower end is provided with a vent hole 12 for communicating the cavity III 6 with the cavity II 5, the lower end of the oil baffle 3 is provided with an oil baffle flat section notch 13, and the cavity I4 is communicated with the cavity II 5 through the oil baffle flat section notch 13.
The first cavity 4 is provided with a first cavity opening 16 which communicates the first cavity 4 with the bearing body oil return cavity 15, and the second cavity 5 is provided with a second cavity opening 17 which communicates the second cavity 5 with the bearing body oil return cavity 15.
The height of the notch 13 of the flat section of the oil baffle is more than 10mm lower than the lower edge of the vent hole 12.
The notch 13 of the flat section of the oil baffle is obliquely and downwards fixedly connected with an oil baffle guide section 14, and the oil baffle guide section 14 extends to the oil return cavity 15 of the bearing body.
The working principle of the device is as follows:
According to the invention, the top of the shaft seal radial extension section 8 is provided with the sealing ring groove III, the sealing ring groove III is internally provided with the sealing ring groove III, and the sealing ring groove III and the inner ring surface of the impeller sleeve seat bulge section 7 form a mechanical sealing III 11, and the cavity III 6 and the cavity I4 are relatively isolated due to the existence of the mechanical sealing III 11;
because the cavity I opening 16 is formed to enable the cavity I4 to be communicated with the bearing body oil return cavity 15, and the vent hole 12 is formed to enable the cavity III 6 to be communicated with the bearing body oil return cavity 15, the cavity I4, the cavity II 5 and the cavity III 6 are communicated, the pressure among the cavities can be kept consistent, and the pressure difference at two ends of the mechanical seal III 11 is small;
When a vehicle carrying an engine is in a long downhill road section for reverse towing running or an air filter in front of the air compressor is seriously blocked, a certain negative pressure exists in the air compressor flow channel, when the negative pressure value reaches a certain degree and exceeds the sealing capacity of the first mechanical seal 9 and the second mechanical seal 10, a suction effect is formed in the cavity III 6, and due to the existence of the third mechanical seal 11, the small negative pressure suction effect in the cavity III 6 can be overcome, so that the defect that in the traditional turbocharger, lubricating oil in the cavity I4 easily passes through a radial gap between the oil baffle 3 and the shaft seal radial extension section 8 and easily enters the cavity II 5 is avoided;
under the isolation effect of the mechanical seal III 11, lubricating oil sprayed out from a gap between the thrust bearing 18 and the shaft seal bearing surface 19 moves in the cavity I4 under the action of pressure and centrifugal force, and as the bottom of the cavity I4 is provided with the cavity I opening 16 and the oil baffle guide section 14 points to the bearing body oil return cavity 15, the lubricating oil in the cavity I4 enters the bearing body oil return cavity 15 under the action of gravity and is discharged from the bearing body oil return port;
At this time, the weak negative pressure in the cavity III 6 can suck air from the bearing body oil return cavity 15 through the vent hole 12 formed in the bottom of the cavity III 6, and as the oil baffle 3 is designed, the height of the notch 13 of the flat section of the oil baffle is ensured to be lower than the lower edge of the vent hole 12 by more than 10mm after the oil baffle 3 is installed, and the design size of the vent hole 12 is relatively large, the suction airflow speed of the cavity III 6 under the suction effect is relatively low, and the lubricating oil below the lower airflow suction speed is difficult to suck the lubricating oil in the direction of the reverse gravity into the cavity III 6, so that the possibility that the lubricating oil enters the cavity III 6 is basically isolated under the negative pressure oil leakage resistant structure, and the negative pressure oil leakage resistant capability of the turbocharger compressor can be greatly improved.
The first mechanical seal 9 and the second mechanical seal 10 comprise a first sealing ring groove and a second sealing ring groove which are correspondingly arranged on the shaft seal 2, the first sealing ring groove and the second sealing ring groove are correspondingly sleeved with a first sealing ring and a second sealing ring, and the outer ring of the first sealing ring and the outer ring of the second sealing ring are tightly connected with the inner hole of the impeller sleeve seat 1 through radial elastic pretightening force.
The mechanical seal III 11 comprises a seal ring groove III arranged on the shaft seal radial extension section 8, a seal ring III is sleeved in the seal ring groove III, and the outer ring of the seal ring III is tightly connected with the impeller sleeve seat bulge section 7 through radial elastic pretightening force.
In a second embodiment of the present invention,
As shown in fig. 5, the difference between the present embodiment and the first embodiment is that the vent hole 12 is eliminated, the air supplementing channel 20 communicating with the cavity three 6 is opened on the impeller sleeve seat 1, and the inlet end of the air supplementing channel 20 is connected with the pressure air source.
The inlet end of the air supplementing channel 20 is connected with an air supplementing pipe 21 in an interference mode, and the inlet end of the air supplementing pipe 21 extends out of the bearing shell and is connected with a pressure air source.
Inflating the cavity III 6 by an external pressure air source so that the pressure in the cavity III 6 is always higher than the pressure in the cavity I4;
when the air filter of the engine is blocked to cause the flow passage of the air compressor to be in a negative pressure state, the cavity III 6 is in positive pressure due to the inflation of an external pressure air source, namely the pressure of the cavity III 6 is larger than that of the cavity I4, and the state can effectively prevent lubricating oil from entering the cavity III 6 from the sealing ring III, so that the leakage of the lubricating oil to the flow passage of the air compressor can be prevented;
Because the external pressure air source is utilized to pressurize the cavity III 6, the pressure of the two side wall surfaces of the shaft seal radial extension section 8 on the side of the cavity III 6 is higher, and the pressure on the side of the cavity I4 is lower, therefore, the shaft seal radial extension section 8 can generate axial force pointing to the turbine end and is used for balancing a part of resultant force generated by the impeller 22 and the turbine and pointing to the compressor end, so that the bearing load of the thrust bearing 18 is reduced, and the thrust bearing 18 with smaller thrust area can be selected during the design of the supercharger, thereby being beneficial to the improvement of the thermal efficiency of the turbocharger and the engine.
It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit the technical solution of the present invention, and although the detailed description of the present invention is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention, and all the modifications or substitutions are included in the scope of the claims and the specification of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511093124.3A CN120576120B (en) | 2025-08-06 | 2025-08-06 | Negative pressure oil leakage resistant structure of turbocharger compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511093124.3A CN120576120B (en) | 2025-08-06 | 2025-08-06 | Negative pressure oil leakage resistant structure of turbocharger compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN120576120A true CN120576120A (en) | 2025-09-02 |
| CN120576120B CN120576120B (en) | 2025-10-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202511093124.3A Active CN120576120B (en) | 2025-08-06 | 2025-08-06 | Negative pressure oil leakage resistant structure of turbocharger compressor |
Country Status (1)
| Country | Link |
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| CN (1) | CN120576120B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121111460A (en) * | 2025-11-06 | 2025-12-12 | 潍坊学院 | Turbochargers that improve localized oil supply and negative pressure oil leakage capabilities |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05280366A (en) * | 1991-02-05 | 1993-10-26 | Toyota Motor Corp | Oil seal construction for turbocharger |
| JPH07217440A (en) * | 1994-02-02 | 1995-08-15 | Taiho Kogyo Co Ltd | Non-contact sealing device for turbocharger |
| JPH08135458A (en) * | 1994-11-09 | 1996-05-28 | Toyota Motor Corp | Supercharger oil seal structure |
| EP2169186A2 (en) * | 2008-09-26 | 2010-03-31 | Pierburg GmbH | Sealing arrangement for the compressor side of a turbocharger of a combustion engine and corresponding method for sealing of this compressor side |
| DE102013005167B3 (en) * | 2013-03-26 | 2014-09-11 | Borgwarner Inc. | turbocharger |
| CN114575936A (en) * | 2022-04-13 | 2022-06-03 | 无锡威孚高科技集团股份有限公司 | Shaft end sealing structure of turbocharger |
| CN217055298U (en) * | 2022-03-30 | 2022-07-26 | 无锡威孚高科技集团股份有限公司 | Shaft end sealing structure of turbocharger |
| CN116480620A (en) * | 2023-03-17 | 2023-07-25 | 天津北方天力增压技术有限公司 | A compressor end sealing structure of a turbocharger |
| CN116816491A (en) * | 2023-08-31 | 2023-09-29 | 潍坊富源增压器有限公司 | Turbocharger |
-
2025
- 2025-08-06 CN CN202511093124.3A patent/CN120576120B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05280366A (en) * | 1991-02-05 | 1993-10-26 | Toyota Motor Corp | Oil seal construction for turbocharger |
| JPH07217440A (en) * | 1994-02-02 | 1995-08-15 | Taiho Kogyo Co Ltd | Non-contact sealing device for turbocharger |
| JPH08135458A (en) * | 1994-11-09 | 1996-05-28 | Toyota Motor Corp | Supercharger oil seal structure |
| EP2169186A2 (en) * | 2008-09-26 | 2010-03-31 | Pierburg GmbH | Sealing arrangement for the compressor side of a turbocharger of a combustion engine and corresponding method for sealing of this compressor side |
| DE102013005167B3 (en) * | 2013-03-26 | 2014-09-11 | Borgwarner Inc. | turbocharger |
| CN217055298U (en) * | 2022-03-30 | 2022-07-26 | 无锡威孚高科技集团股份有限公司 | Shaft end sealing structure of turbocharger |
| CN114575936A (en) * | 2022-04-13 | 2022-06-03 | 无锡威孚高科技集团股份有限公司 | Shaft end sealing structure of turbocharger |
| CN116480620A (en) * | 2023-03-17 | 2023-07-25 | 天津北方天力增压技术有限公司 | A compressor end sealing structure of a turbocharger |
| CN116816491A (en) * | 2023-08-31 | 2023-09-29 | 潍坊富源增压器有限公司 | Turbocharger |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121111460A (en) * | 2025-11-06 | 2025-12-12 | 潍坊学院 | Turbochargers that improve localized oil supply and negative pressure oil leakage capabilities |
Also Published As
| Publication number | Publication date |
|---|---|
| CN120576120B (en) | 2025-10-14 |
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