CN112628188B - High negative pressure resistant turbocharger compressor end sealing structure - Google Patents
High negative pressure resistant turbocharger compressor end sealing structure Download PDFInfo
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- CN112628188B CN112628188B CN202011620281.2A CN202011620281A CN112628188B CN 112628188 B CN112628188 B CN 112628188B CN 202011620281 A CN202011620281 A CN 202011620281A CN 112628188 B CN112628188 B CN 112628188B
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- cover
- sleeve
- shaft
- seal cover
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Classifications
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- 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
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
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- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
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- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/0563—Bearings cartridges
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- 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
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially adapted for elastic fluid pumps
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- 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
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/40—Application in turbochargers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a high negative pressure resistant turbocharger compressor end sealing structure, which comprises a hollow bearing body (1); the center of the inner cavity of the bearing body (1) is provided with a turbine rotating shaft (8) which is transversely distributed; the radial outer wall of the turbine rotating shaft (8) is provided with a compressor impeller (20), a shaft seal sleeve (6) and a thrust spacer sleeve (7) which are distributed in a surrounding manner from left to right; the left side of the shaft sleeve (6) is contacted with the right side of the compressor impeller (20); the right side of the shaft sleeve (6) is contacted with the left side of the thrust spacer sleeve (7); an oil sealing cover (4) is circumferentially arranged on the outer side of the radial periphery of the shaft sleeve (6); a thrust bearing plate (5) is arranged on the outer side of the radial periphery of the thrust spacer sleeve (7); and the thrust bearing plate is arranged in the inner cavity of the bearing body (1). The invention has scientific structural design, can practically improve the negative pressure resistance of the compressor end of the turbocharger and ensures the use reliability of the turbocharger.
Description
Technical Field
The invention relates to the technical field of turbochargers, in particular to a high negative pressure resistant turbocharger compressor end sealing structure.
Background
The turbocharger has the function of providing more compressed air for the engine, so that the engine can burn more fuel, thereby generating more power, improving the fuel economy of the engine and reducing the harmful components of the exhaust gas discharged by the engine. The supercharger has the effects of energy conservation and environmental protection, so that the supercharging technology is comprehensively popularized in the field of engines.
For the turbocharger, when the engine runs at idle speed for a long time, an air filter or an air inlet pipeline is blocked, at the moment, the oil pressure of engine oil entering the turbocharger is higher than the pressure of the wheel back of an impeller of a compressor for compressing air, and the compressor end of the engine is in a negative pressure state and is easy to leak oil.
In addition, when the crankcase breather of the engine is not smooth, the gas pressure in the intermediate body of the supercharger is too high, and under the low working condition of the engine, the pressure in the intermediate body is higher than the supercharging pressure, and at the moment, the sealing ring of the supercharger piston cannot play a sealing role, and oil leakage of the supercharger is easy to cause.
Therefore, the compressor end of the turbocharger is required to have high negative pressure resistance so as to prevent oil leakage of the turbocharger.
However, at present, no technology exists, so that the negative pressure resistance of the compressor end of the turbocharger can be practically improved, and the use reliability of the turbocharger is ensured.
Disclosure of Invention
The invention aims at providing a high negative pressure resistant turbocharger compressor end sealing structure aiming at the technical defects in the prior art.
Therefore, the invention provides a high negative pressure resistant turbocharger compressor end sealing structure, which comprises a hollow bearing body;
the center of the inner cavity of the bearing body is provided with a turbine rotating shaft which is transversely distributed;
the radial outer wall of the turbine rotating shaft is provided with a compressor impeller, a shaft seal sleeve and a thrust spacer sleeve which are distributed in a surrounding manner from left to right;
The left side of the shaft sleeve is contacted with the right side of the compressor impeller;
The right side of the shaft sleeve is contacted with the left side of the thrust spacer sleeve;
Wherein, the oil sealing cover is circumferentially arranged on the outer side of the radial periphery of the shaft sleeve;
A thrust bearing plate is arranged on the outer side of the radial periphery of the thrust spacer sleeve;
and the thrust bearing plate is arranged in the inner cavity of the bearing body.
Preferably, the left end face of the thrust bearing plate is in contact with the right side face of the oil seal cover;
the right end face of the thrust bearing plate is contacted with the right side surface of the cavity at the inner side of the bearing body;
the radial outer side surface of the thrust bearing plate is in clearance fit with the inner cavity of the bearing body;
the radial outer wall of the turbine rotating shaft is respectively in clearance fit with the shaft sleeve and the thrust spacer sleeve;
The radial outer wall of the shaft sleeve is in clearance fit with the right side surface of the oil sealing cover.
Preferably, the inner cavity of the bearing body is circumferentially provided with an oil cover retainer ring accommodating groove;
the radial outer part of the annular oil cover check ring is embedded in the oil cover check ring accommodating groove;
The right side of the radial inner side part of the oil cover retainer ring is contacted with the left side surface of the oil cover.
Preferably, the left end radial outer side surface of the shaft sleeve is provided with two grooves in a surrounding manner at the matching position with the oil sealing cover;
And two grooves are internally provided with a compressor end sealing ring respectively.
Preferably, each compressor end seal ring has an opening therein;
the two openings are horizontally staggered by 180 degrees.
Preferably, the inner cavity of the bearing body is circumferentially provided with an annular sealing ring groove at the radial inner side surface matched with the oil sealing cover;
An oil sealing cover sealing ring is arranged in the sealing ring groove;
The sealing ring of the oil sealing cover is an O-shaped ring.
Preferably, the shaft seal sleeve comprises a shaft seal sleeve body;
The center of the shaft sleeve body is provided with a rotating shaft which transversely penetrates through the shaft sleeve body;
The left end of the shaft seal sleeve body is provided with a convex part, and two sealing grooves which are spaced from each other are circumferentially arranged on the radial outer side surface of the convex part;
the right end of the shaft sleeve body is a supporting part;
the left end and the right end of the supporting part are respectively provided with a front plane oil thrower and a reverse plane oil thrower;
twelve positive oil slinging grooves are distributed at equal intervals on the left side of the positive plane oil slinging disc;
twelve anti-oil slinging grooves are distributed on the right side of the anti-plane oil slinging disc at equal intervals.
Preferably, the oil seal cover is of a central symmetrical structure;
In particular implementation, the oil seal cover comprises an oil seal cover body;
The right side of the oil seal cover body is a cavity structure;
the oil seal cover body is internally provided with a shaft seal sleeve matching through hole which transversely penetrates through;
the shaft sleeve is arranged on the inner side of the shaft sleeve matching through hole;
the oil seal cover body is close to the shaft seal sleeve matching through hole, and is provided with an oblique angle boss in a surrounding manner.
Preferably, the right inner cavity of the oil sealing cover body is provided with a second oil sealing cover oil guiding wedge surface in an inclined distribution in a surrounding manner in the radial outer direction of the bevel boss;
A second oil seal cover vertical surface is arranged in the right side cavity of the oil seal cover body in a surrounding manner;
The oil guiding wedge surface of the second oil sealing cover on the bevel boss is connected with the vertical surface of the second oil sealing cover through circumferentially distributed oil guiding grooves;
The right cavity of the oil sealing cover body is also provided with a first oil sealing cover oil guiding wedge surface which is obliquely distributed and a first oil sealing cover vertical surface which is vertically distributed in a surrounding manner;
The inner side of the vertical surface of the first oil sealing cover is connected with the outer side of the oil guiding wedge surface of the first oil sealing cover;
The right cavity of the oil seal cover body is also provided with an oil seal cover transverse surface which is transversely distributed;
The left side of the transverse surface of the oil sealing cover is connected with the outer side of the vertical surface of the first oil sealing cover;
the right end face of the oil sealing cover body is a bottom face of the oil sealing cover which is distributed in a surrounding manner;
the inner side of the bottom surface of the oil sealing cover is connected with the right side of the transverse surface of the oil sealing cover.
Preferably, the inner diameters of the oil guiding wedge surface of the first oil sealing cover and the oil guiding wedge surface of the second oil sealing cover are gradually increased from left to right;
the right side of the bevel boss is provided with a bevel boss end face;
The outer side of the bevel boss end face is closer to the shaft seal sleeve matching through hole than the inner side of the first oil seal cover vertical face.
Compared with the prior art, the technical scheme provided by the invention provides the high-negative pressure resistant turbocharger compressor end sealing structure, which is scientific in structural design, can practically improve the negative pressure resistant capability of the turbocharger compressor end, ensures the use reliability of the turbocharger, and has great production and practice significance.
The invention can improve the negative pressure resistance of the compressor end of the turbocharger on the premise of not changing the length of small parts of the turbocharger shafting, not obviously increasing the manufacturing cost of the turbocharger and not affecting the reliability of the turbocharger, and is a compressor end sealing structure with easy processing of parts of a sealing shafting and high negative pressure resistance degree.
Drawings
FIG. 1 is a schematic view of a turbocharger compressor end seal structure with high negative pressure resistance, in an overall cross section in a turbocharger bearing body (i.e., intermediate body), according to the present invention;
FIG. 2 is an enlarged schematic view of the portion A of FIG. 1, showing a high negative pressure resistant compressor end seal structure of a turbocharger according to the present invention;
FIG. 3a is a schematic axial cross-sectional view of a shaft envelope in a high negative pressure resistant turbocharger compressor end seal configuration provided by the present invention;
FIG. 3b is a schematic view of the left side of the shaft seal sleeve in the high negative pressure resistant turbocharger compressor end seal structure provided by the invention;
FIG. 3c is a schematic view of the right side of the shaft sleeve in the high negative pressure resistant turbocharger compressor end seal structure according to the present invention
Fig. 4 is a schematic diagram of an oil seal cover in a high negative pressure resistant turbocharger compressor end sealing structure provided by the invention.
Detailed Description
In order that the manner in which the application is carried out will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting of the application. It should be further noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that, in the description of the present application, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In addition, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the term "mounted" and the like should be construed broadly, and may be fixed or removable, for example.
The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 4, the invention provides a high negative pressure resistant turbocharger compressor end sealing structure, which comprises a hollow bearing body 1;
The center of the inner cavity of the bearing body 1 is provided with a turbine rotating shaft 8 which is transversely distributed;
The radial outer wall of the turbine rotating shaft 8 is provided with a compressor impeller 20, a shaft seal sleeve 6 and a thrust spacer sleeve 7 which are distributed in a surrounding manner from left to right;
The compressor wheel 20 is provided with a plurality of turbine blades.
The left side of the shaft sleeve 6 is in contact with the right side of the compressor wheel 20;
The right side of the shaft sleeve 6 is contacted with the left side of the thrust spacer 7;
wherein, the oil seal cover 4 is circumferentially arranged on the outer side of the periphery of the shaft seal sleeve 6 in the radial direction;
A thrust bearing plate 5 is arranged on the outer side of the radial periphery of the thrust spacer 7;
A thrust bearing plate 5 is installed in the inner cavity of the bearing body 1.
In the invention, the left end face of the thrust bearing plate 5 is contacted with the right side face of the oil seal cover 4;
In the invention, the right end face of the thrust bearing plate 5 is contacted with the right side surface (namely the right side wall) of the cavity inside the bearing body 1;
in particular, the radial outer side surface of the thrust bearing plate 5 is in clearance fit with the inner cavity of the bearing body 1.
In the invention, in particular implementation, an inner cavity of the bearing body 1 is circumferentially provided with an oil cover retainer ring accommodating groove 201;
In the oil cover retainer receiving groove 201, an annular radially outer portion of the oil cover retainer 2 is embedded;
the right side of the radially inner portion of the oil cover retainer ring 2 is in contact with the left side of the oil cover 4.
Thus, with the present invention, the left end of the oil seal cover 4, by the oil seal cover retainer 2 (which is a circlip), the oil seal cover 4 and the thrust bearing plate 5 can be pressed tightly against the right side surface (i.e., the right side wall) of the inner cavity of the bearing body 1.
In the invention, the radial outer wall of the turbine rotating shaft 8 is in clearance fit with the shaft seal sleeve 6 and the thrust spacer sleeve 7 respectively.
The radially outer wall of the shaft sleeve 6 (specifically the outer wall of the support 602) is in clearance fit with the right side surface of the oil cover 4 with a second gap 11 therebetween.
In the invention, the left end radial outer side surface of the shaft seal sleeve 6 is provided with two grooves 6-2 in a surrounding manner at the matching position with the oil seal cover 4;
Two grooves 6-2 are internally provided with a compressor end sealing ring 9 respectively;
In particular implementation, the number of the compressor end sealing rings 9 is two, the material is W6Mo5Cr4V2, when the two compressor end sealing rings 9 are assembled, the openings on the two compressor end sealing rings 9 (one opening is formed in one compressor end sealing ring 9) are preferably staggered horizontally by 180 degrees (i.e. the two openings are staggered by 180 degrees, and the included angle between the central point of the two openings and the central point of the compressor end sealing ring 9 is 180 degrees), so that lubricating oil can be further effectively prevented from entering the wheel back of the compressor impeller 20 under the condition that the air inlet of the compressor is negative pressure.
In the present invention, the radial outer side surface of the thrust spacer 7 is in clearance fit with the inner side surface of the thrust bearing plate 5 with a first gap 10 therebetween.
In the invention, in particular implementation, an annular sealing ring groove (particularly an O-shaped ring groove) is circumferentially arranged at the inner radial side surface matched with the oil sealing cover 4 in the inner cavity of the bearing body (namely an intermediate body) 1;
in the seal ring groove, an oil seal cover seal ring 3 is arranged.
In the present invention, compared with the prior art in which the O-ring groove is provided at the outer diameter surface of the oil seal cover, the oil storage space of the oil seal cover is increased, so that the entry of lubricating oil into the second gap 11 (the gap between the oil seal cover 4 and the shaft seal sleeve 6) can be effectively prevented, and oil leakage can be prevented.
In particular implementation, the sealing ring 3 of the oil sealing cover is an O-shaped ring.
In particular, the second gap 11 is not easily oversized, is controlled by component tolerances, and has a minimum tolerance slightly greater than the axial gap, in this example, the second gap 11 has a lateral width in the range of 0.17mm to 0.3 mm.
In the embodiment of the present invention, shafting small pieces are all assembled on the bearing body 1, the bearing body 1 is a support body of a supercharger component, and is matched with the oil seal cover sealing ring 3 to prevent lubricating oil from leaking to a compressor end from a gap between the oil seal cover 4 and the bearing body 1, and the bearing body 1 bears heat load transmitted from a turbine end in addition to mechanical load of a rotor component.
For the invention, the thrust bearing plate 5 is used for limiting the axial movement of the turbine rotating shaft 8 and preventing the compressor impeller from rubbing with the volute and the turbine impeller from rubbing with the turbine box.
In the invention, the thrust spacer 7 rotates along with the turbine rotating shaft 8 and is used for throwing part of lubricating oil flowing out of the thrust bearing plate 5 into the oil return cavity of the bearing body 1.
For the specific implementation of the invention, the turbine rotating shaft 8 drives the thrust spacer sleeve 7, the shaft seal sleeve 6 and the compressor impeller 20 which are penetrated on the turbine rotating shaft 8 to rotate, and also bears various loads and vibration loads when the rotor works, so that alternating stress generated by bending and torsion is born.
In particular, the compressor impeller 20 rotates along with the turbine rotating shaft 8 at a circumferential speed, and the gas pressure generated by the compressor impeller 20 acting on the air can prevent lubricating oil from leaking from the sealing ring 9 to the compressor end and bear loads such as centrifugal force, blade vibration, gas pressure and the like generated by rotation of the impeller.
In particular, the compressor end sealing ring 9 is a through-flow part for preventing lubricating oil of a bearing from entering the compressor end of the supercharger, and preventing air of the compressor from entering the lubricating oil cavity of the supercharger, so that the supercharger can work normally.
In the present invention, the shaft seal sleeve 6 includes a shaft seal sleeve body 60;
it should be noted that, in the present invention, the middle section of the shaft seal sleeve body 60 is a convex structure;
the center of the shaft sleeve body 60 is provided with a rotating shaft 6-8 which transversely penetrates through the center;
The left end of the shaft seal sleeve body 60 is provided with a convex part 601, and two sealing grooves 6-2 which are spaced from each other are circumferentially arranged on the radial outer side surface of the convex part 601;
the right end of the shaft seal sleeve body 60 is a supporting part 602;
The left and right ends of the supporting part 602 are respectively provided with a front plane oil thrower 6-6 and a reverse plane oil thrower 6-7;
Twelve positive oil throwing grooves 6-3 are uniformly distributed on the left side of the positive plane oil throwing disc 6-6 at intervals;
twelve anti-oil throwing grooves 6-4 are uniformly distributed on the right side of the anti-plane oil throwing disc 6-7 at intervals;
In the concrete implementation, the positive oil slinging groove 6-3 and the reverse oil slinging groove 6-4 are arc-shaped oil slinging grooves, the radial outer sides of the oil slinging grooves are open (i.e. normally open), the right side of the reverse oil slinging groove 6-4 is open (not sealed), and the left side of the positive oil slinging groove 6-3 is open (not sealed).
It should be noted that, for the present invention, due to the arrangement of the oil slinger grooves, a convex tooth is formed between any two adjacent oil slinger grooves, so that the front plane oil slinger 6-6 and the reverse plane oil slinger 6-7 can be said to be toothed planes with twelve teeth.
It should be noted that the shape and configuration of the forward oil slinger grooves 6-3 and the reverse oil slinger grooves 6-4 are the same, but are located in the forward oil slinger 6-6 and the reverse oil slinger 6-7, respectively, which are disposed in the opposite directions.
Specifically, the left and right sides of the shaft seal sleeve body 60 are respectively provided with a shaft sleeve and impeller contact end surface 6-1 and a shaft sleeve and thrust bearing plate contact end surface 6-5.
It should be noted that, based on the above description, for the present invention, the shaft seal sleeve 6 includes the shaft seal sleeve body 60, the shaft sleeve and impeller contact end surface 6-1, the two seal grooves 6-2, the forward oil slinger groove 6-3, the reverse oil slinger groove 6-4, the shaft sleeve and thrust bearing plate contact end surface 6-5, the forward oil slinger 6-6, and the reverse oil slinger 6-7.
It should be noted that, with the present invention, the front-surface oil thrower 6-6 and the reverse-surface oil thrower 6-7 can throw out part of the lubricating oil; the positive oil throwing groove 6-3 and the reverse oil throwing groove 6-4 work on the lubricating oil entering the oil throwing groove through the rotation action, so that the lubricating oil is well thrown out, and the oil quantity entering the position of the compressor end sealing ring 9 is effectively reduced.
In the invention, the oil seal cover 4 has a central symmetrical structure;
In particular, the oil seal cover 4 comprises an oil seal cover body 40;
the right side of the oil seal cover body 40 is a cavity structure;
the oil seal cover body 40 is internally provided with a shaft seal sleeve matching through hole 4-8 which transversely penetrates through;
The shaft sleeve 6 is arranged on the inner side of the shaft sleeve matching through hole 4-8;
The oil seal cover body 40 is arranged near the shaft seal sleeve matching through hole 4-8 in a surrounding way and provided with an oblique angle boss 4-9.
In the concrete implementation, a second oil seal cover oil guide wedge surface 4-6 which is obliquely distributed is circumferentially arranged in the radial outer side direction of the bevel boss 4-9 in the right inner cavity of the oil seal cover body 40;
a second oil seal cover vertical surface 4-5 is arranged in the right side cavity of the oil seal cover body 40 in a surrounding manner;
the oil guiding wedge surface 4-6 of the second oil sealing cover on the bevel boss 4-9 is connected with the vertical surface 4-5 of the second oil sealing cover through oil guiding grooves 4-7 distributed in a surrounding manner;
Wherein, the oil guiding groove 4-7 is a groove with an arc-shaped axial section, in particular to a fillet-shaped oil guiding groove.
In the concrete implementation, a first oil seal cover oil guide wedge surface 4-4 which is obliquely distributed and a first oil seal cover vertical surface 4-3 which is vertically distributed are also arranged in the right side cavity of the oil seal cover body 40 in a surrounding manner;
The inner side (namely the lower side) of the vertical surface 4-3 of the first oil sealing cover is connected with the outer side of the oil guiding wedge surface 4-4 of the first oil sealing cover;
Wherein, the right side cavity of the oil seal cover body 40 is also provided with an oil seal cover transverse surface 4-2 which is transversely distributed;
the left side of the oil seal cover transverse surface 4-2 is connected with the outer side (namely the upper side) of the first oil seal cover vertical surface 4-3;
Wherein, the right end surface of the oil seal cover body 40 is a circumferentially distributed oil seal cover bottom surface 4-1;
The inner side (i.e., the lower side) of the oil cover bottom surface 4-1 is connected to the right side of the oil cover lateral surface 4-2.
In the concrete implementation, the inner diameters of the first oil sealing cover oil guiding wedge surface 4-4 and the second oil sealing cover oil guiding wedge surface 4-6 are gradually increased from left to right.
The right side of the bevel boss 4-9 is provided with a bevel boss end face 4-10;
The outside of the bevel boss end face 4-10 is closer to the shaft jacket fit through hole 4-8 (i.e. lower) than the inside of the first oil seal cover vertical face 4-3, so as to ensure that the shaft jacket 6 can throw oil onto the further oil seal cover transverse face 4-2, so that the lubricating oil can be prevented from splashing into the second gap 11, part of the lubricating oil left on the oil seal cover transverse face 4-2 flows to the bottom (i.e. right end) of the oil seal cover 4, part of the lubricating oil flows into the oil guide groove 4-7 along the first oil seal cover vertical face 4-3, the first oil seal cover oil wedge face 4-4 and the vertical second oil seal cover vertical face 4-5, the lubricating oil splashed onto the second oil seal cover oil wedge face 4-6 also flows into the oil guide groove 4-7, the lubricating oil entering the oil guide groove 4-7 can be smoothly flowed into the bottom (i.e. right end) of the oil seal cover, the lubricating oil can be prevented from flowing into the second gap 11, and the lubricating oil can be well prevented from flowing into the compressor impeller from two gaps 9 to the compressor side (i.e. left compressor side end 20) under the condition that the engine low-working condition or long-time idle running causes air intake negative pressure.
Based on the above discussion, the oil seal cover 4 integrally comprises an oil seal cover body 40, an oil seal cover bottom surface 4-1, an oil seal cover transverse surface 4-2, a first oil seal cover vertical surface 4-3, a first oil seal cover oil guide wedge surface 4-4, a second oil seal cover vertical surface 4-5, a second oil seal cover oil guide wedge surface 4-6, an oil guide groove 4-7, a shaft seal sleeve matching through hole 4-8, an oblique angle boss 4-9 and an oblique angle boss end surface 4-10.
Compared with the prior art, the high negative pressure resistant turbocharger compressor end sealing structure provided by the invention has the following beneficial effects:
1. for the invention, twelve arc-shaped oil slinging grooves and twelve tooth-shaped plane oil slinging structures (namely a front plane oil slinger 6-6 and a reverse plane oil slinger 6-7) are uniformly distributed on the front side and the back side (namely the left side and the right side) of the shaft seal sleeve 6, the diesel engine drives the supercharger to operate in the idling or high-speed operation process, the shaft seal sleeve 6 arranged on the turbine rotating shaft 8 can sling lubricating oil entering the oil slinging grooves through the rotating action, the oil quantity entering the sealing ring 9 of the compressor end can be effectively reduced, and the lubricating oil slinged by the shaft seal sleeve 6 can be guided back into an oil return cavity (namely a cavity formed between the right side of the oil sealing cover 4 and the inner left side of the bearing body 1) of the bearing body 1 through two oil guiding wedge surfaces, so that the negative pressure resistance of the compressor end of the supercharger is improved.
2. According to the invention, on the premise of not changing the length of a shafting part, the shaft seal sleeve can be provided with two separated piston seal ring grooves (namely, two grooves 6-2 and a compressor end seal ring 9), when the two piston seal rings (namely, the two compressor end seal rings 9) are assembled, the openings on the two compressor end seal rings 9 are horizontally staggered by 180 degrees, and under the condition that the air inlet of the compressor is negative pressure, lubricating oil can be further effectively prevented from entering the wheel back of the compressor impeller 20, and the processing is convenient.
3. According to the invention, twelve arc-shaped oil throwing grooves uniformly distributed on the front and back sides of the shaft seal sleeve 6 can be formed by die sinking casting, so that the structure is simple, the processing is convenient, and the manufacturing cost of the supercharger is greatly reduced.
In summary, compared with the prior art, the high-negative pressure resistant turbocharger compressor end sealing structure provided by the invention has scientific structural design, can practically improve the negative pressure resistant capability of the turbocharger compressor end, ensures the use reliability of the turbocharger, and has great production practice significance.
The invention can improve the negative pressure resistance of the compressor end of the turbocharger on the premise of not changing the length of small parts of the turbocharger shafting, not obviously increasing the manufacturing cost of the turbocharger and not affecting the reliability of the turbocharger, and is a compressor end sealing structure with easy processing of parts of a sealing shafting and high negative pressure resistance degree.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The high negative pressure resistant turbocharger compressor end sealing structure is characterized by comprising a hollow bearing body (1);
the center of the inner cavity of the bearing body (1) is provided with a turbine rotating shaft (8) which is transversely distributed;
The radial outer wall of the turbine rotating shaft (8) is provided with a compressor impeller (20), a shaft seal sleeve (6) and a thrust spacer sleeve (7) which are distributed in a surrounding manner from left to right;
the left side of the shaft sleeve (6) is contacted with the right side of the compressor impeller (20);
the right side of the shaft sleeve (6) is contacted with the left side of the thrust spacer sleeve (7);
Wherein, the oil sealing cover (4) is circumferentially arranged on the outer side of the periphery of the shaft sealing sleeve (6) in the radial direction;
a thrust bearing plate (5) is arranged on the outer side of the radial periphery of the thrust spacer sleeve (7);
a thrust bearing plate (5) mounted in the inner cavity of the bearing body (1);
the left end face of the thrust bearing plate (5) is contacted with the right side face of the oil sealing cover (4);
The right end face of the thrust bearing plate (5) is contacted with the right side surface of the cavity inside the bearing body (1);
The radial outer side surface of the thrust bearing plate (5) is in clearance fit with the inner cavity of the bearing body (1);
the radial outer wall of the turbine rotating shaft (8) is respectively in clearance fit with the shaft seal sleeve (6) and the thrust spacer sleeve (7);
the radial outer wall of the shaft sleeve (6) is in clearance fit with the right side surface of the oil sealing cover (4);
The radial outer side surface of the left end of the shaft sleeve (6) is provided with two grooves (6-2) in a surrounding manner at the matching position with the oil sealing cover (4);
Two grooves (6-2) are internally provided with a compressor end sealing ring (9) respectively;
each compressor end sealing ring (9) is provided with an opening;
The two openings are horizontally staggered by 180 degrees;
the shaft sleeve (6) comprises a shaft sleeve body (60);
The center of the shaft sleeve body (60) is provided with a rotating shaft (6-8) which transversely penetrates through the center;
the left end of the shaft sleeve body (60) is provided with a convex part (601), and two sealing grooves (6-2) which are spaced from each other are circumferentially arranged on the radial outer side surface of the convex part (601);
The right end of the shaft sleeve body (60) is a supporting part (602);
the left and right ends of the supporting part (602) are respectively provided with a front plane oil thrower (6-6) and a reverse plane oil thrower (6-7);
Twelve positive oil throwing grooves (6-3) are distributed at equal intervals on the left side of the positive plane oil throwing disc (6-6);
twelve anti-oil throwing grooves (6-4) are distributed on the right side of the anti-plane oil throwing disc (6-7) at equal intervals.
2. The high negative pressure resistant turbocharger compressor end sealing structure according to claim 1, wherein the inner cavity of the bearing body (1) is circumferentially provided with an oil cover retainer ring accommodating groove (201);
The radial outer part of the annular oil sealing cover check ring (2) is embedded in the oil sealing cover check ring accommodating groove (201);
The right side of the radial inner side part of the oil sealing cover check ring (2) is contacted with the left side surface of the oil sealing cover (4).
3. The high negative pressure resistant turbocharger compressor end sealing structure according to claim 1, wherein an annular seal ring groove is circumferentially arranged at the inner cavity of the bearing body (1) at the radial inner side surface matched with the oil seal cover (4);
An oil sealing cover sealing ring (3) is arranged in the sealing ring groove;
The sealing ring (3) of the oil sealing cover is an O-shaped ring.
4. The high negative pressure resistant turbocharger compressor end sealing structure according to claim 1, wherein the oil seal cover (4) is of a central symmetry structure;
in particular implementation, the oil seal cover (4) comprises an oil seal cover body (40);
the right side of the oil seal cover body (40) is of a cavity structure;
The oil seal cover body (40) is internally provided with a shaft seal sleeve matching through hole (4-8) which transversely penetrates through;
the inner side of the shaft sleeve matching through holes (4-8) is provided with a shaft sleeve (6);
The oil seal cover body (40) is arranged near the shaft seal sleeve matching through hole (4-8) in a surrounding way and is provided with an oblique angle boss (4-9).
5. The high negative pressure resistant turbocharger compressor end sealing structure according to claim 4, wherein the right side inner cavity of the oil seal cover body (40) is provided with second oil seal cover oil guide wedge surfaces (4-6) which are obliquely distributed in a surrounding manner in the radial outer direction of the bevel boss (4-9);
A second oil seal cover vertical surface (4-5) is arranged in the right side cavity of the oil seal cover body (40) in a surrounding manner;
The oil guiding wedge surface (4-6) of the second oil sealing cover on the bevel boss (4-9) is connected with the vertical surface (4-5) of the second oil sealing cover through oil guiding grooves (4-7) distributed in a surrounding manner;
the right cavity of the oil seal cover body (40) is also provided with a first oil seal cover oil guide wedge surface (4-4) which is obliquely distributed and a first oil seal cover vertical surface (4-3) which is vertically distributed in a surrounding manner;
the inner side of the vertical surface (4-3) of the first oil sealing cover is connected with the outer side of the oil guiding wedge surface (4-4) of the first oil sealing cover;
Wherein, the right side cavity of the oil seal cover body (40) is also provided with an oil seal cover transverse surface (4-2) which is transversely distributed;
The left side of the transverse surface (4-2) of the oil sealing cover is connected with the outer side of the vertical surface (4-3) of the first oil sealing cover;
wherein, the right end face of the oil seal cover body (40) is a bottom face (4-1) of the oil seal cover which is distributed in a surrounding way;
The inner side of the bottom surface (4-1) of the oil sealing cover is connected with the right side of the transverse surface (4-2) of the oil sealing cover.
6. The high negative pressure resistant turbocharger compressor end seal structure of claim 5, wherein the inner diameters of the first oil cover oil guiding wedge surface (4-4) and the second oil cover oil guiding wedge surface (4-6) are gradually increased from left to right;
the right side of the bevel boss (4-9) is provided with a bevel boss end face (4-10);
The outer side of the bevel boss end face (4-10) is closer to the shaft seal sleeve matching through hole (4-8) than the inner side of the first oil seal cover vertical face (4-3).
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| CN115450750A (en) * | 2022-07-28 | 2022-12-09 | 中国北方发动机研究所(天津) | Self-adaptive centrifugal pump type sealing structure of turbocharger |
| CN115929680B (en) * | 2023-03-13 | 2023-06-02 | 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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| CN101925726A (en) * | 2008-01-28 | 2010-12-22 | 株式会社Ihi | Pressure-increasing machine |
| JP2013024148A (en) * | 2011-07-22 | 2013-02-04 | Ihi Corp | Seal structure of turbine-side seal part of supercharger |
| CN203404120U (en) * | 2013-06-28 | 2014-01-22 | 湖南天雁机械有限责任公司 | Sealing structure of turbocharger compressor |
| CN104454150A (en) * | 2014-12-04 | 2015-03-25 | 湖南天雁机械有限责任公司 | Turbocharger gas compressor sealing structure |
| CN205101283U (en) * | 2015-10-28 | 2016-03-23 | 长城汽车股份有限公司 | Turbo charger's compressor end seal structure , turbo charger and car |
| CN106285923A (en) * | 2016-07-29 | 2017-01-04 | 中国北方发动机研究所(天津) | A kind of turbocharger seals gets rid of oil structure |
| CN106523045B (en) * | 2016-11-16 | 2018-11-02 | 中国北方发动机研究所(天津) | A kind of turbocharger centrifugal pump type sealing structure |
| CN106438444A (en) * | 2016-12-14 | 2017-02-22 | 宜兴市灵谷塑料设备有限公司 | Oil flinger of pump bearing box |
| CN110700902A (en) * | 2019-10-14 | 2020-01-17 | 中国北方发动机研究所(天津) | Turbine rotating shaft structure capable of reducing oil leakage |
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