CN106368809A - Tiny rotor with radial sealing piece - Google Patents
Tiny rotor with radial sealing piece Download PDFInfo
- Publication number
- CN106368809A CN106368809A CN201610916339.5A CN201610916339A CN106368809A CN 106368809 A CN106368809 A CN 106368809A CN 201610916339 A CN201610916339 A CN 201610916339A CN 106368809 A CN106368809 A CN 106368809A
- Authority
- CN
- China
- Prior art keywords
- rotor
- diaphragm seal
- zig
- type structure
- sealing piece
- 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.)
- Pending
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Classifications
-
- 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
- F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
- F02B55/02—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
- F02F11/007—Arrangements of sealings in combustion engines involving rotary applications
-
- 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
- F02B75/00—Other engines
- F02B75/34—Ultra-small engines, e.g. for driving models
Abstract
The invention discloses a tiny rotor with a radial sealing piece, and belongs to the field of rotor engines. The tiny rotor comprises a rotor body, a sealing piece body and a zigzag structure. The zigzag structure and the sealing piece body are sequentially machined in a groove-shaped structure in the top end of the rotor body from bottom to exterior. On the basis of the advanced micro electro mechanical system machining technology, the sealing piece and the rotor are machined into a whole, the zigzag structure is arranged between the rotor body and the sealing piece body, and the structure has the function of a leaf spring. The number of components after a rotor engine becomes small is greatly reduced, and reliability and stability of engine running are improved. An air leakage channel at the bottom of a radial sealing piece of a traditional rotor engine is eliminated, the air leakage situation between combustion chambers is reduced, and the efficiency of the tiny rotor engine is improved. The problems that when the traditional rotor and the radial sealing piece of the traditional rotor are adopted in the rotor engine miniaturization process, sealing piece and leaf spring machining and assembling are difficult, the number of the components is large, and air leakage is serious through the sealing manner are solved.
Description
Technical field
The present invention relates to the radial seal of small rotary engine, more particularly, to a kind of with apex seal small turn
Son, belongs to rotary engine field.
Background technology
One of development trend of electromechanical industries is the microminaturization of equipment, such as microrobot, MAV, portable or
Wearable computer, military individual-soldier system, micro-valve micropump system etc., how to provide high-energy-density, Gao Ke for these equipment
Become the problem becoming increasingly conspicuous by property, long-life microminiature power set.The power resources of these equipment mostly are electricity at present
Pond, but the energy density of battery is far below the internal combustion engine that the chemical energy of hydrocarbon fuel is directly converted into mechanical energy, even
Currently relatively advanced lithium ion battery, its energy density is only about the 1/20 of ordinary internal combustion engine.Therefore micro internal combustion engine send out
Open up the development of pushing equipment microminaturization significantly.
, as one kind of internal combustion engine, parts count is less, structure is relatively easy, suitable high rotary speed working for rotary engine,
These features make the microminaturization of rotary engine become research and application focus.Microminaturization in rotary engine
Cheng Zhong, the problem that the efficiency decline that air loss brings even is unable to steady operation is more and more prominent, between different combustor
Leakage at rotor apex seal piece for the gas is the important component part of air loss, how to design rotor apex seal device
Particularly important.In traditional rotary engine, apex rotor dig fluted, need in groove to install spring leaf and diaphragm seal come real
Existing radial seal.With the miniaturization of rotary engine, the size reduction of spring leaf and diaphragm seal, high-precision processing and installation
Time and Financial cost all can be led to increase, and, more parts count leads to the reliability decrease of rotary engine work.
Therefore, it can consider be designed processing so as to become a part as one using rotor and diaphragm seal.Mems process technology
Development make be processed into possibility with the micro- trochantinian of diaphragm seal.Depth as the silicon micromachining technology with the U.S. as representative
Degree reactive ion etching technology, it is possible to produce the structure of high-aspect-ratio, can obtain one very under the live width of a very little
Deep structure.The and for example x light Deep lithography with Germany as representative, micro- electroforming, micro- plastic casting technology, it is possible to achieve various metals, height
The micro Process of molecular material, pottery etc..Therefore processing technique greatly reduces to the restriction of miniature rotor structure design.
Content of the invention
The purpose of the present invention be overcome existing rotary engine microminaturization during, the apex seal of rotor and spring
Piece processing, assembling are difficult, and parts count is many, and this kind of sealing means make gas leakage deterioration between combustor so that electromotor is transported
Turn the technological deficiency that reliability and efficiency reduces it is proposed that a kind of small rotor with apex seal.
The usual way of the radial seal of rotor is to dig out groove at the top place of rotor, is sequentially loaded into spring leaf and sealing
Piece, rotor and its apex combustion seal are made up of rotor, three spring leafs and three diaphragm seals altogether, in rotary engine microminiature
During change, on the one hand it is used for micro- trochantinian spring leaf and the processing of diaphragm seal and assembly difficulty increases, on the other hand tradition
Sealing means between the adjacent combustor that the gas passage that diaphragm seal bottom is formed causes in top gas leakage situation drastically
Deteriorate, cause engine efficiency to reduce.And the small rotor with apex seal of present invention design improves above-mentioned difficulty
Point.Rotor and its end sealing piece, spring leaf, as being integrally machined shaping, need not individually process diaphragm seal and spring leaf, need not
Diaphragm seal and spring leaf are installed；Gas passage is no longer arranged at diaphragm seal bottom, improves the gas blowby situation of adjacent combustor.
A kind of small rotor with apex seal, abbreviation rotor, including rotor subject, diaphragm seal main body and zigzag
Structure；
In the groove type structure on described rotor subject top, zig-zag type structure and diaphragm seal are outwards machined with successively by bottom
Main body；Described concave groove type structure, zigzag structure and diaphragm seal main body are in the two-dimensional structure in rotor axial plane,
It is that this two-dimensional structure does not change in rotor axis direction；The version possessing this feature can utilize advanced mems,
I.e. MEMS, process technology completes, and the technology based on x light Deep lithography, micro- electroforming, micro- plastic casting technology can be adopted to complete；
Described zig-zag type structure bottom is connected with rotor subject bottom portion of groove, and top is connected with diaphragm seal main body；Zig-zag type
Structure in the plane of rotor axial with regard to its geometric center centrosymmetry；The axial length of zig-zag type structure and rotor
The thickness of main body is equal, the width of zig-zag type structure be slightly less than rotor subject groove width so that rotor in use,
Zig-zag type structure can occur radial expansion；
Described zigzag structure and rotor subject groove floor and diaphragm seal body floor are by tangent and corresponding flat
Arc transition；Described zigzag structure bending place is by the tangent transition of the radius arc such as two；
Described zig-zag type structure plays the effect of spring leaf, is subject on diaphragm seal top to point to making of the radial direction of rotor center
When firmly, zig-zag type structure can occur the radial deformation of macroscopic view, and produces reaction force acts in diaphragm seal main body；Elastic force can
To be adjusted by changing the depth of groove on the bending angle and rotor subject of zig-zag type structure；
Font structure connects described diaphragm seal bottom part body therewith, the thickness phase of diaphragm seal principal length and rotor subject
Deng width is slightly less than the width of rotor subject groove, and to ensure after expanded by heating, diaphragm seal main body still can produce radially
Displacement；Described diaphragm seal top is circular arc, and summit is slightly above the theory shaped wire summit of rotor subject work surface；
The theory shaped wire of described rotor subject work surface is made up of three sections of identical circular arcs, and arc radius are corresponding with circular arc
Central angle computing formula respectively as shown formula (1) and formula (2):
Wherein, in formula (1), r is arc radius, and e is the eccentric throw of rotary engine；K in formula (1) and formula (2)
Form factor for rotary engine；α in formula (2) is the corresponding central angle of circular arc；Arcsin is arcsin function；
Described rotor subject, diaphragm seal main body and zigzag structure adopt alloy steel material.
Beneficial effect
A kind of small rotor with apex seal of the present invention, rotor and its radial seal with conventional rotors electromotor
Device is compared and is had the advantages that
1. the present invention solves rotary engine during microminaturization, rotor apex seal device radial seal
Piece and the problem of spring leaf processing and assembling difficulty；
2. The present invention reduces the parts count of miniature rotor electromotor, it is to avoid due to the fortune leading to parts count more
Turn the problem of stationarity and reliability decrease；
3., under conventional seals version, adjacent two combustor can occur gas blowby by diaphragm seal bottom, so that rotor is sent out
Efficiency in miniaturization process for the motivation drastically reduces, and diaphragm seal main body of the present invention and rotor subject are direct by zig-zag type structure
Connect, effectively prevent the generation of this kind of phenomenon；
4. the present invention makes full use of existing mems MEMS process technology, can start solution rotor preferably
The problem that machine is deteriorated due to the radial seal that microminaturization leads to；
5. the present invention takes full advantage of advanced mems (MEMS) process technology, for example, x light Deep lithography, micro-
Electroforming, micro- plastic casting technology, can process high-precision micro-structure, including flexuose high-aspect-ratio proposed by the present invention
Structure.
Brief description
Fig. 1 is rotor installation in the cylinder in a kind of small rotor with apex seal of the present invention and embodiment 1
The location drawing；
Fig. 2 is the partial enlarged drawing of part shown in dotted line circle in Fig. 1, illustrates the small rotor with apex seal
Radial seal partial structurtes, be the accompanying drawing of embodiment 1；
Fig. 3 is the 3 d part figure in a kind of small rotor embodiment 2 with apex seal of the present invention；
Fig. 4 is the word of end sealing piece main body sum in a kind of small rotor embodiment 2 with apex seal of the present invention
The partial enlarged drawing of shape structure；
Fig. 5 is the three-dimensional installation diagram of conventional rotors and its sealing device in the embodiment of the present invention 3；
Fig. 6 is the explosive view of conventional rotors and its each part of sealing device in the embodiment of the present invention 3.
Description of reference numerals: 1- cylinder, the small rotor with apex seal for the 2-, the diaphragm seal main body of rotor described in 3-,
The zigzag structure of rotor described in 4-, the rotor subject of rotor described in 5-, 6- conventional radial diaphragm seal, 7- conventional radial seals bullet
Reed, 8- conventional rotors.
Specific embodiment
With specific embodiment, in-depth explanation is carried out to the present invention below in conjunction with the accompanying drawings, but protection scope of the present invention does not limit
In this.
Embodiment 1
This example illustrates a kind of micro- trochantinian basic structure with apex seal of the present invention.
In conjunction with Fig. 1 and Fig. 2, it is processed on the premise of ensureing precision, size sets according to concrete power set.
Small rotor with apex seal installation site in the cylinder is as shown in Figure 1.In Fig. 1,1 is small rotor
The cylinder of electromotor, 2 is a kind of small rotor with apex seal of the present invention；Content in dotted line circle obtains in fig. 2
Concrete displaying.
This patent does not discuss cylinder 1, and the structure of internal rotor is not discussed, only discusses that apex rotor comprises apex seal and exists
Interior part, as shown in Fig. 2 in Fig. 2,1 is cylinder, 3 is diaphragm seal main body for the concrete structure of this part, 4 character form structures for it,
5 is rotor subject.Rotor subject 5 top is groove structure, is machined with zigzag structure 4 and diaphragm seal master upwards from groove low side
Body 3.Micro- trochantinian three top ends with apex seal, structure is identical, as shown in Figure 1.
Embodiment 2
This example illustrates a kind of micro- trochantinian specific embodiment with apex seal of the present invention.
Fig. 3 is a kind of micro- trochantinian 3 d part figure with apex seal of the present invention.Three top grooves of rotor
Structure, zigzag structure and diaphragm seal main body are in the two-dimensional structure in rotor axial plane, and that is, this two-dimensional structure exists
Rotor axis direction does not change.This construction features can make full use of advanced mems (MEMS) process technology,
For example, x light Deep lithography, micro- electroforming, micro- plastic casting technology.
Fig. 4 is the graphics of the partial enlargement corresponding to Fig. 2 part.In Fig. 4,3 is diaphragm seal main body, and 4 is to tie in a zigzag
Structure, 5 is rotor subject.Zigzag structure and bottom portion of groove and diaphragm seal bottom part body, by tangent arc transition, are tied in a zigzag
Structure is designed with two knuckles, is the tangent arc transition of two grade radiuses at knuckle.Can be adjusted by changing the radius of tangent arc
The elastic force of whole zigzag structure.Zigzag structure in the plane of rotor axial with regard to geometric center centrosymmetry.It
The nominal dimension of character form structure width is slightly less than recess width, and length is equal with rotor subject thickness.Diaphragm seal body width with
Zigzag structure width is equal, and length is equal with rotor thickness, and diaphragm seal body top face is circular arc.Diaphragm seal highly should not mistake
Height, rotor subject depth of groove is unsuitable too deep.
Embodiment 3
The present embodiment elaborates the present invention with reference to conventional rotors engine rotor and its end sealing piece and chip architecture of the spring
A kind of micro- trochantinian beneficial effect with apex seal.
Fig. 5 is the installation diagram of conventional rotors and its apex combustion seal, and Fig. 6 is the explosive view corresponding to Fig. 5.In Fig. 6,6
For conventional rotors radial seal diaphragm seal, 7 is conventional rotors radial seal spring leaf, and 8 is conventional rotors.Apex rotor adds
Work is fluted, is equipped with circular arc spring leaf in groove, and spring leaf is equipped with diaphragm seal, therefore rotor and its radial seal dress
Put that totally 10 parts form by 1 rotor, 3 spring leafs, 3 diaphragm seals altogether, in rotary engine miniaturization process, spring
The processing of piece and diaphragm seal and assembly difficulty greatly increase, and in engine operation process, reduce its reliability and stationarity.
Small rotor with apex seal proposed by the present invention is a part, therefore, in rotary engine miniaturization process,
Greatly reduce parts count, improve rotary engine maintainability and stationarity.On the other hand, in conventional rotors and
In the design of its apex combustion seal, it is circular arc spring leaf between diaphragm seal and apex rotor groove, so that diaphragm seal bottom is led to
Cross diaphragm seal sideshake by adjacent two combustion chamber, form leakage path, in rotary engine miniaturization process, pass through
The gas leakage of diaphragm seal bottom and reduce the problem worse of engine efficiency, seriously constrain carrying of miniature rotor engine efficiency
High.In the present invention, between diaphragm seal main body and rotor subject, character form structure is connected for it, and diaphragm seal bottom does not have leakage path,
Greatly reduce the gas leakage situation of miniature rotor electromotor, improve engine efficiency.
The above is presently preferred embodiments of the present invention, and the present invention should not be limited to this embodiment and accompanying drawing institute is public
The content opened.Every without departing from complete equivalent or modification under spirit disclosed in this invention, both fall within the model of present invention protection
Enclose.
Claims (4)
1. a kind of small rotor with apex seal, abbreviation rotor it is characterised in that: include rotor subject, diaphragm seal master
Body and zigzag structure；Described rotor subject, diaphragm seal main body and zigzag structure adopt alloy steel material；
In the groove type structure on described rotor subject top, zig-zag type structure and diaphragm seal main body are outwards machined with successively by bottom；
Described concave groove type structure, zigzag structure and diaphragm seal main body are in the two-dimensional structure in rotor axial plane, that is, this
Two-dimensional structure does not change in rotor axis direction；The version possessing this feature can be that is, micro- using advanced mems
Mechatronic Systems, process technology completes, and the technology based on x light Deep lithography, micro- electroforming, micro- plastic casting technology can be adopted to complete.
2. as claimed in claim 1 a kind of small rotor with apex seal it is characterised in that: described zig-zag type structure
Bottom is connected with rotor subject bottom portion of groove, and top is connected with diaphragm seal main body；Zig-zag type structure is perpendicular to rotor axial
With regard to its geometric center centrosymmetry in plane；The axial length of zig-zag type structure is equal with the thickness of rotor subject, zig-zag type
The width of structure be slightly less than rotor subject groove width so that rotor in use, zig-zag type structure can occur radially
Flexible；Described zigzag structure and rotor subject groove floor and diaphragm seal body floor are by tangent and corresponding flat circular arc
Transition；Described zigzag structure bending place is by the tangent transition of the radius arc such as two；
Described zig-zag type structure plays the effect of spring leaf, is subject to point to the active force of the radial direction of rotor center on diaphragm seal top
When, zig-zag type structure can occur the radial deformation of macroscopic view, and produces reaction force acts in diaphragm seal main body；Elastic force can lead to
The depth of groove crossed on the bending angle and rotor subject that change zig-zag type structure is adjusted.
3. as claimed in claim 1 a kind of small rotor with apex seal it is characterised in that:
Font structure connects described diaphragm seal bottom part body therewith, and diaphragm seal principal length is equal with the thickness of rotor subject, wide
Degree is slightly less than the width of rotor subject groove, and to ensure after expanded by heating, diaphragm seal main body still can produce radial displacement；
Described diaphragm seal top is circular arc, and summit is slightly above the theory shaped wire summit of rotor subject work surface.
4. as claimed in claim 3 a kind of small rotor with apex seal it is characterised in that:
The theory shaped wire of described rotor subject work surface is made up of three sections of identical circular arcs, arc radius and the corresponding center of circle of circular arc
The computing formula at angle is as shown in formula (1) and formula (2) respectively:
Wherein, in formula (1), r is arc radius, and e is the eccentric throw of rotary engine；K in formula (1) and formula (2) is to turn
The form factor of sub- electromotor；α in formula (2) is the corresponding central angle of circular arc；Arcsin is arcsin function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610916339.5A CN106368809A (en) | 2016-10-20 | 2016-10-20 | Tiny rotor with radial sealing piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610916339.5A CN106368809A (en) | 2016-10-20 | 2016-10-20 | Tiny rotor with radial sealing piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106368809A true CN106368809A (en) | 2017-02-01 |
Family
ID=57894970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610916339.5A Pending CN106368809A (en) | 2016-10-20 | 2016-10-20 | Tiny rotor with radial sealing piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106368809A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939830A (en) * | 2017-05-05 | 2017-07-11 | 唐山海庞科技有限公司 | Heavy oil aviation rotary engine |
| CN107687368A (en) * | 2017-10-16 | 2018-02-13 | 北京理工大学 | A kind of miniature rotor engine apex seal friction loss Forecasting Methodology |
| CN109854363A (en) * | 2019-03-28 | 2019-06-07 | 江苏中力齿轮有限公司 | A kind of engine link increasing journey rotor |
| CN110094276A (en) * | 2019-04-30 | 2019-08-06 | 宁波大学 | A kind of diaphragm seal of rotary polygonal piston engine |
| CN110344964A (en) * | 2019-07-04 | 2019-10-18 | 西北工业大学 | Rotary engine apex combustion seal and rotary engine |
| CN110645115A (en) * | 2019-11-13 | 2020-01-03 | 华北水利水电大学 | Sealing sheet of rotor engine |
| CN112901338A (en) * | 2021-03-12 | 2021-06-04 | 北京工业大学 | Radial sealing piece with gradually-expanded diffusion tubular cut |
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| DE2527209A1 (en) * | 1975-06-16 | 1976-12-30 | Athanassios Kartalis | Four-stroke rotary piston engine - has cylindrical housing with eccentric rotor having four spring-loaded tangential sealing strips |
| US4358259A (en) * | 1979-02-16 | 1982-11-09 | Toyo Kogyo Co., Ltd. | Rotary piston engine sealing mechanisms |
| RU2045663C1 (en) * | 1991-12-18 | 1995-10-10 | Иннокентий Михайлович Большанин | System for sealing rotor-piston internal combustion engine |
| RU2100629C1 (en) * | 1995-07-06 | 1997-12-27 | Кармальский Александр Михайлович | Rotary internal combustion engine |
| CN101160454A (en) * | 2005-04-15 | 2008-04-09 | 谢夫勒两合公司 | Device for variably adjusting control times of gas exchange valves of an internal combustion engine |
| JP2008303870A (en) * | 2007-06-07 | 2008-12-18 | Yoshio Abe | Pressure cancellation hole |
| CN103228869A (en) * | 2010-09-17 | 2013-07-31 | En3股份有限公司 | Seal for the rotor of rotary piston machines |
| CN103615312A (en) * | 2013-11-22 | 2014-03-05 | 姜地 | Telescopic cylindrical rotor type engine |
-
2016
- 2016-10-20 CN CN201610916339.5A patent/CN106368809A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2527209A1 (en) * | 1975-06-16 | 1976-12-30 | Athanassios Kartalis | Four-stroke rotary piston engine - has cylindrical housing with eccentric rotor having four spring-loaded tangential sealing strips |
| US4358259A (en) * | 1979-02-16 | 1982-11-09 | Toyo Kogyo Co., Ltd. | Rotary piston engine sealing mechanisms |
| RU2045663C1 (en) * | 1991-12-18 | 1995-10-10 | Иннокентий Михайлович Большанин | System for sealing rotor-piston internal combustion engine |
| RU2100629C1 (en) * | 1995-07-06 | 1997-12-27 | Кармальский Александр Михайлович | Rotary internal combustion engine |
| CN101160454A (en) * | 2005-04-15 | 2008-04-09 | 谢夫勒两合公司 | Device for variably adjusting control times of gas exchange valves of an internal combustion engine |
| JP2008303870A (en) * | 2007-06-07 | 2008-12-18 | Yoshio Abe | Pressure cancellation hole |
| CN103228869A (en) * | 2010-09-17 | 2013-07-31 | En3股份有限公司 | Seal for the rotor of rotary piston machines |
| CN103615312A (en) * | 2013-11-22 | 2014-03-05 | 姜地 | Telescopic cylindrical rotor type engine |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939830A (en) * | 2017-05-05 | 2017-07-11 | 唐山海庞科技有限公司 | Heavy oil aviation rotary engine |
| CN106939830B (en) * | 2017-05-05 | 2019-04-05 | 唐山海庞科技有限公司 | Heavy oil aviation rotary engine |
| CN107687368A (en) * | 2017-10-16 | 2018-02-13 | 北京理工大学 | A kind of miniature rotor engine apex seal friction loss Forecasting Methodology |
| CN109854363A (en) * | 2019-03-28 | 2019-06-07 | 江苏中力齿轮有限公司 | A kind of engine link increasing journey rotor |
| CN110094276A (en) * | 2019-04-30 | 2019-08-06 | 宁波大学 | A kind of diaphragm seal of rotary polygonal piston engine |
| CN110344964A (en) * | 2019-07-04 | 2019-10-18 | 西北工业大学 | Rotary engine apex combustion seal and rotary engine |
| CN110645115A (en) * | 2019-11-13 | 2020-01-03 | 华北水利水电大学 | Sealing sheet of rotor engine |
| CN110645115B (en) * | 2019-11-13 | 2021-11-02 | 华北水利水电大学 | Sealing sheet of rotor engine |
| CN112901338A (en) * | 2021-03-12 | 2021-06-04 | 北京工业大学 | Radial sealing piece with gradually-expanded diffusion tubular cut |
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Application publication date: 20170201 |