CN113861681A - Composite material for sealing structure of turbocharger and preparation method thereof - Google Patents
Composite material for sealing structure of turbocharger and preparation method thereof Download PDFInfo
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- CN113861681A CN113861681A CN202111038788.1A CN202111038788A CN113861681A CN 113861681 A CN113861681 A CN 113861681A CN 202111038788 A CN202111038788 A CN 202111038788A CN 113861681 A CN113861681 A CN 113861681A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/28—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a composite material for a sealing structure of a turbocharger and a preparation method thereof, wherein the sealing structure comprises a supercharger shell and a sealing assembly; one end of the supercharger shell is used for being mounted on the pressing wheel, and the sealing assembly is arranged on the inner wall of the other end of the supercharger shell; the sealing assembly comprises an aluminum insert and a plastic piece; the plastic part is made of polyimide composite material. The polyimide composite material comprises 50-80 parts of special plastic; 10-30 parts of glass beads; 10-30 parts of kaolin; 5-10 parts of talcum powder; 2-5 parts of graphite; 0.5-1 part of zinc stearate coupling agent. The linear expansion coefficient of the polyimide composite material obtained by the invention is kept consistent with that of the aluminum material of the pressure shell within the working temperature range of the turbocharger; meanwhile, the mechanical strength of the material is lower than that of aluminum; the aluminum pressure wheel is protected during high-speed operation.
Description
Technical Field
The invention belongs to the technical field of new materials, particularly relates to a composite material used in a sealing structure of a turbocharger and a preparation method thereof, and particularly relates to a formula of a special material for a sealing element of the turbocharger of an engine and a preparation method thereof.
Background
The turbocharger is actually an air compressor that increases the intake air amount by compressing air. The engine uses the inertia impulse force of the exhaust gas from the engine to push the turbine in the turbine chamber, the turbine drives the coaxial impeller, the impeller presses the air sent by the air filter pipeline, and the air is pressurized and enters the cylinder. When the rotating speed of the engine is increased, the exhaust gas exhaust speed and the rotating speed of the turbine are also increased synchronously, the impeller compresses more air to enter the air cylinder, the pressure and the density of the air are increased, more fuel can be combusted, and the output power of the engine can be increased by correspondingly increasing the fuel quantity and adjusting the rotating speed of the engine.
Because metal parts are arranged between the pressure shell and the pressure wheel of the engine turbocharger, a certain safety clearance must be ensured in order to ensure that the pressure wheel and the pressure shell do not collide; resulting in some loss of turbocharger efficiency; the oil consumption of the engine is increased. Therefore, a material is needed to contact the pinch roller to reduce the mounting gap to improve turbocharger efficiency; thereby saving energy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a composite material for a sealing structure of a turbocharger and a preparation method thereof.
In one aspect, the present disclosure relates to a turbocharger pressure housing seal structure, which includes a supercharger housing and a seal assembly; one end of the supercharger shell is used for being mounted on the pressing wheel, and the sealing assembly is arranged on the inner wall of the other end of the supercharger shell;
the sealing assembly comprises an aluminum insert and a plastic piece;
the aluminum insert is arranged on the inner wall of the other end of the supercharger shell, and the plastic piece is arranged on the inner wall of the aluminum insert in an injection molding mode;
the plastic part is made of polyimide composite material.
As an embodiment of the invention, the inner wall of the supercharger shell is provided with a processing groove at the position for installing the sealing assembly, and the aluminum insert is arranged in the processing groove.
As an embodiment of the invention, the inner wall of the aluminum insert is provided with an annular groove, and the plastic part is partially embedded in the annular groove.
As an embodiment of the present invention, the annular groove has a rectangular cross section.
As an embodiment of the invention, the aluminum insert is provided with a diversion inclined surface.
As an embodiment of the present invention, a plurality of protrusions are provided on a sidewall of the aluminum insert contacting the plastic member.
As an embodiment of the invention, the protrusions are conical.
As one embodiment of the invention, the polyimide composite material comprises the following components in parts by weight:
the polyimide composite material obtained by the invention meets the requirements of turbocharger on high temperature of 230 ℃ and low temperature of-60 ℃; the linear expansion coefficient of the material in the temperature range is consistent with that of the aluminum material of the press shell; meanwhile, the mechanical strength of the material is lower than that of aluminum; the aluminum pressure wheel is protected during high-speed operation.
As an embodiment of the present invention, the specialty plastic is selected from one or more of Thermoplastic Polyimide (TPI), Polyetheretherketone (PEEK), Polyethersulfone (PEI), Polyetherimide (PEI), polyphenylene sulfide (PPS).
As an embodiment of the present invention, the glass micro beads have a particle size of 10 to 100 μm.
As one embodiment of the present invention, the particle size of the kaolin is 20 to 50 microns.
As an embodiment of the invention, the particle size of the zinc stearate coupling agent is 40-50 microns.
As one embodiment of the present invention, the preparation method of the polyimide composite material includes the steps of:
s1, material preparation: weighing the components according to the parts by weight for later use;
s2, extrusion granulation: fully dispersing and mixing the glass beads, kaolin, talcum powder and graphite; then uniformly mixing the mixture with special plastic and zinc stearate to obtain a mixture; and adding the mixture into a main feeding port of a double-screw compounding extruder, and extruding and granulating the mixed material to obtain the polyimide composite material.
As an embodiment of the invention, in step S2, the temperature of the first zone of the twin-screw compounding extruder is 365-.
As an embodiment of the present invention, in step S2, the main machine rotation speed of the twin-screw compounding extruder is 200-250 rpm, and the feeding speed is 10-30 kg/h.
As an embodiment of the present invention, in step S2, the head temperature of the twin-screw compounding extruder is 385-420 ℃.
In a second aspect, the invention also relates to an application of the polyimide composite material in a sealing structure of a pressure shell of a turbocharger.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with unmodified special plastics, the material obtained by the invention has a linear expansion coefficient close to that of aluminum in a temperature range of-60 ℃ to 230 ℃, so that the installation clearance between the sealing element resin and the pinch roller is kept unchanged at different temperatures, and a small clearance between the pinch roller and the number of the pinch rollers can be kept; therefore, the efficiency of the turbocharger is improved, and the oil consumption of the engine is reduced;
(2) the material obtained by the invention has low mechanical strength, and under extreme conditions, the pinch roller is protected from being damaged.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a graph showing linear expansion ratios of polyimide composites obtained in example 1 and comparative example 1.
FIG. 2 is a schematic structural view of a turbocharger pressure housing seal arrangement of the present invention;
fig. 3 is a structural view of the turbocharger pressure shell sealing structure of the present invention highlighting the annular groove.
The figures show that:
supercharger housing 1 processing groove 4
Aluminum insert 301
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The following examples, which are set forth to provide a detailed description of the invention and a detailed description of the operation, will help those skilled in the art to further understand the present invention. It should be noted that the scope of the present invention is not limited to the following embodiments, and that several modifications and improvements made on the premise of the idea of the present invention belong to the scope of the present invention.
Example 1
(1) The turbocharger presses the shell seal structure:
FIG. 2 is a schematic structural view of a turbocharger pressure housing seal arrangement of the present invention; fig. 3 is a structural view of the turbocharger pressure shell sealing structure of the present invention highlighting the annular groove.
As shown in fig. 2 and 3, the turbocharger pressure shell sealing structure according to the present embodiment includes a turbocharger housing 1 and a sealing assembly 3, wherein one end of the turbocharger housing 1 is used for mounting the pressure roller 2, and the sealing assembly 3 is disposed on the inner wall of the other end. The sealing component 3 comprises an aluminum insert 301 and a plastic piece 302, the aluminum insert 301 is arranged on the inner wall of the other end of the supercharger shell 1, and the plastic piece 302 is arranged on the inner wall of the aluminum insert 301 in an injection molding mode. The plastic member 302 is a polyimide composite.
The inner wall of the supercharger shell 1 is provided with a processing groove 4 at the position for mounting the sealing component 3, the aluminum insert 301 is arranged in the processing groove 4, the inner wall of the aluminum insert 301 is provided with an annular groove 5, the plastic part 302 is partially embedded in the annular groove 5, and the section of the annular groove 5 is rectangular.
The aluminum insert 301 is provided with a flow guiding inclined plane 6, and a plurality of bulges are arranged on one side wall of the aluminum insert 301 contacting the plastic piece 302 and are in a conical shape.
(2) Polyimide composite material:
the components are as follows: the polyimide composite material related to the embodiment is prepared from the following components in parts by weight: thermoplastic polyimide: 65 parts, glass beads: 15 parts, kaolin: 10 parts, talc powder: 6 parts of graphite: 3 parts of zinc stearate and 1 part of zinc stearate. Wherein the particle size of the glass beads is 20 microns, and the particle size of the kaolin is 20 microns; the particle size of zinc stearate is about 45 μm.
(3) The preparation method of the polyimide composite material comprises the following steps:
material preparation: weighing the components according to the formula ratio for later use;
and (3) extruding and granulating: firstly, fully dispersing and mixing glass beads, kaolin, talcum powder and graphite; then uniformly mixing the mixture with thermoplastic polyimide and zinc stearate to obtain a mixture; and adding the mixture into a main feeding port of a double-screw compounding extruder, and extruding and granulating the mixed material to obtain the polyimide composite material.
Wherein the parameters of the twin-screw compounding extruder are set as follows: the temperature of the first zone is 400 ℃, the temperature of the second zone is 400 ℃, the temperature of the third zone is 400 ℃, the temperature of the fourth zone is 400 ℃, the temperature of the machine head is 400 ℃, the rotating speed of the main machine is 220 r/min, and the feeding speed is 20 kg/h.
The structure of the turbocharger has the following specific embodiments:
the first step is as follows: injection molding (casting or machining) aluminum into an insert with a certain structure;
the second step is that: preheating the aluminum insert in an oven to 150-250 ℃;
the third step: placing the insert into a mold for injection molding; the injection molding process comprises the following steps:
temperature of the die: 150-250 ℃;
injection molding temperature of the injection molding machine: a first stage: 350-420 ℃, and the second stage: 350-420 ℃, third stage: 350-420 ℃;
a nozzle: 350-420 ℃;
injection molding pressure: 50MPa to 120 MPa;
injection molding the booster gland seal as in fig. 3;
the fourth step: removing a pouring gate and burrs of injection molding;
the fifth step: pressing the sealing element of the pressure shell of the supercharger into the pressure shell with a groove which is processed in advance in an interference manner, wherein the outer diameter of the sealing element is 0.03-0.15mm larger than the inner diameter of the groove of the pressure shell;
and a sixth step: according to the shape and precision of the pinch roller impeller, the plastic part is processed to the precision requirement matched with the pinch roller impeller, and the novel supercharger pressure shell with pressure shell sealing can be obtained.
FIG. 1 is a graph showing linear expansion ratios of polyimide composites obtained in example 1 and comparative example 1. This curve can be obtained by the GB 1036 and 1989 test.
Example 2
This example differs from example 1 only in that: (2) polyimide composite material:
the components are as follows: the polyimide composite material related to the embodiment is prepared from the following components in parts by weight: polyether imide: 50 parts of glass beads: 10 parts, kaolin: 15 parts, talc powder: 10 parts of graphite: 2 parts of zinc stearate and 0.7 part of zinc stearate. Wherein the particle size of the glass beads is 10 microns, and the particle size of the kaolin is 30 microns; the particle size of zinc stearate is about 50 μm.
The parameters of the twin screw compounding extruder in this example were set as: the temperature of the first zone is 365 ℃, the temperature of the second zone is 380 ℃, the temperature of the third zone is 380 ℃, the temperature of the fourth zone is 385 ℃, the temperature of the machine head is 350 ℃, the rotating speed of the main machine is 200 r/min, and the feeding speed is 10 kg/h.
Example 3
This example differs from example 1 only in that: (2) polyimide composite material:
the components are as follows: the polyimide composite material related to the embodiment is prepared from the following components in parts by weight: thermoplastic polyimide: 80 parts, glass beads: 30 parts, kaolin: 30 parts, talc powder: 5 parts of graphite: 5 parts of zinc stearate and 0.5 part of zinc stearate. Wherein the particle size of the glass beads is 100 microns, and the particle size of the kaolin is 50 microns; the particle size of zinc stearate is about 40 μm.
The parameters of the twin screw compounding extruder in this example were set as: the temperature of the first zone is 420 ℃, the temperature of the second zone is 420 ℃, the temperature of the third zone is 420 ℃, the temperature of the fourth zone is 420 ℃, the temperature of the machine head is 420 ℃, the rotating speed of the main machine is 250 r/min, and the feeding speed is 30 kg/h.
Comparative example 1
The polyimide composite material related to the comparative example is prepared from the following components in parts by weight: thermoplastic polyimide: 65 parts, glass beads: 15 parts, kaolin: 10 parts, talc powder: 6 parts of graphite: 3 parts of zinc stearate and 1 part of zinc stearate.
The comparative example and example 1 are different only in the preparation method of the polyimide composite material, and specifically as follows:
material preparation: weighing the components according to the formula ratio for later use;
and (3) extruding and granulating: firstly, fully dispersing and mixing glass beads, kaolin, talcum powder and graphite; adding polyetherimide and zinc stearate, and mixing uniformly to obtain a mixture; and adding the mixture into a main feeding port of a double-screw compounding extruder, and extruding and granulating the mixed material to obtain the polyether ether composite material.
Wherein the parameters of the twin-screw compounding extruder are set as follows: the temperature of the first zone is 350 ℃, the temperature of the second zone is 360 ℃, the temperature of the third zone is 360 ℃, the temperature of the fourth zone is 360 ℃, the temperature of the machine head is 400 ℃, the rotating speed of the main machine is 220 r/min, and the feeding speed is 20 kg/h.
The embodiment also provides a turbocharger pressure shell sealing structure which is the same as the turbocharger pressure shell sealing structure in the embodiment 1.
Comparative example 2
The present comparative example differs from example 1 only in that: the polyimide composite material comprises 5 parts of glass beads.
Comparative example 3
The present comparative example differs from example 1 only in that: kaolin is not included in the composition of the polyimide composite.
Comparative example 4
The present comparative example differs from example 1 only in that: the polyimide composite material comprises 5 parts of zinc stearate coupling agent.
Comparative example 5
The present comparative example differs from example 1 only in that: the polyimide composite material does not contain a zinc stearate coupling agent.
Comparative example 6
The comparative example and example 1 are different only in that the polyimide composite has a composition in which 2 parts of talc powder is present.
Performance testing
Compressive strength: the test temperature was 23 ℃ and the test was carried out using the test method of ISO 604.
Tensile strength: the test temperature was 23 ℃ and the test was carried out using the test method of ISO 527.
Flexural modulus: the test temperature was 23 ℃ and the test was carried out using the test method of ISO 178.
Izod (notched): the test temperature is 23 ℃ and the test is carried out by adopting the test method of ISO 180.
Izod (unnotched): the test temperature is 23 ℃ and the test is carried out by adopting the test method of ISO 180.
Heat distortion temperature: the test is carried out by adopting the test method of ISO 75-f, and the applied pressure is 1.82 MPa.
The polyimide composites obtained in examples 1 to 3 and comparative examples 1 to 6 were subjected to the above-mentioned tests, and further, tensile strength and heat distortion temperature tests were carried out using ZL101A as a reference, and the test results are shown in Table 1.
TABLE 1
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A turbocharger pressure shell sealing structure is characterized by comprising a supercharger shell (1) and a sealing assembly (3); one end of the supercharger shell (1) is used for being mounted on the pressing wheel (2), and the sealing assembly (3) is arranged on the inner wall of the other end of the supercharger shell (1);
the sealing assembly (3) comprises an aluminum insert (301) and a plastic piece (302);
the aluminum insert (301) is arranged on the inner wall of the other end of the supercharger shell (1), and the plastic part (302) is arranged on the inner wall of the aluminum insert (301) in an injection molding mode;
the plastic part (302) is made of polyimide composite material.
2. The turbocharger pressure shell sealing structure according to claim 1, wherein the polyimide composite material comprises the following components in parts by weight:
3. the turbocharger pressure shell sealing structure according to claim 2, wherein the special plastic is selected from one or more of thermoplastic polyimide, polyether ether ketone, polyether sulfone, polyether imide and polyphenylene sulfide.
4. The turbocharger pressure casing sealing structure according to claim 2, wherein the glass beads have a particle size of 10 to 100 μm.
5. The turbocharger pressure casing seal structure of claim 2, wherein the particle size of the kaolin is 20-50 microns.
6. The turbocharger pressure casing sealing structure according to claim 2, wherein the particle size of the zinc stearate coupling agent is 40-50 microns.
7. The turbocharger pressure shell sealing structure according to claim 2, wherein the preparation method of the polyimide composite material comprises the following steps:
s1, material preparation: weighing the components according to the parts by weight for later use;
s2, extrusion granulation: fully dispersing and mixing the glass beads, kaolin, talcum powder and graphite; then uniformly mixing the mixture with special plastic and zinc stearate to obtain a mixture; and adding the mixture into a main feeding port of a double-screw compounding extruder, and extruding and granulating the mixed material to obtain the polyimide composite material.
8. The sealing structure of the pressure shell of the turbocharger as recited in claim 7, wherein in step S2, the temperature of the first zone, the temperature of the second zone, the temperature of the third zone and the temperature of the fourth zone of the twin-screw compounding extruder are 365-.
9. The sealing structure of the turbocharger pressure shell according to claim 7, wherein in step S2, the main machine rotation speed of the twin-screw compounding extruder is 200-250 rpm, and the feeding speed is 10-30 kg/h.
10. The turbocharger pressure casing sealing structure according to claim 7, wherein in step S2, the head temperature of the twin-screw compounding extruder is 385-420 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111038788.1A CN113861681A (en) | 2021-09-06 | 2021-09-06 | Composite material for sealing structure of turbocharger and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111038788.1A CN113861681A (en) | 2021-09-06 | 2021-09-06 | Composite material for sealing structure of turbocharger and preparation method thereof |
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| CN113861681A true CN113861681A (en) | 2021-12-31 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130171395A1 (en) * | 2010-09-29 | 2013-07-04 | Yamaira Gonzalez | Polyimide resins for high temperature applications |
| CN203769867U (en) * | 2014-03-11 | 2014-08-13 | 江苏毅合捷汽车科技股份有限公司 | Shaft seal structure of turbocharger |
| WO2014209852A1 (en) * | 2013-06-28 | 2014-12-31 | Borgwarner Inc. | Turbocharger compressor-end carbon face seal |
| CN210714853U (en) * | 2019-09-24 | 2020-06-09 | 无锡速必得涡轮技术有限公司 | Sealing structure applied to pressure end and vortex end of turbocharger |
| DE102019119317A1 (en) * | 2019-07-17 | 2021-01-21 | Schaeffler Technologies AG & Co. KG | Low-friction elastomer seal |
-
2021
- 2021-09-06 CN CN202111038788.1A patent/CN113861681A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130171395A1 (en) * | 2010-09-29 | 2013-07-04 | Yamaira Gonzalez | Polyimide resins for high temperature applications |
| WO2014209852A1 (en) * | 2013-06-28 | 2014-12-31 | Borgwarner Inc. | Turbocharger compressor-end carbon face seal |
| CN203769867U (en) * | 2014-03-11 | 2014-08-13 | 江苏毅合捷汽车科技股份有限公司 | Shaft seal structure of turbocharger |
| DE102019119317A1 (en) * | 2019-07-17 | 2021-01-21 | Schaeffler Technologies AG & Co. KG | Low-friction elastomer seal |
| CN210714853U (en) * | 2019-09-24 | 2020-06-09 | 无锡速必得涡轮技术有限公司 | Sealing structure applied to pressure end and vortex end of turbocharger |
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