CN104943202B - Carbon fibre composite axial flow fan vane wheel forming and hardening device - Google Patents
Carbon fibre composite axial flow fan vane wheel forming and hardening device Download PDFInfo
- Publication number
- CN104943202B CN104943202B CN201510383933.8A CN201510383933A CN104943202B CN 104943202 B CN104943202 B CN 104943202B CN 201510383933 A CN201510383933 A CN 201510383933A CN 104943202 B CN104943202 B CN 104943202B
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- Prior art keywords
- section
- blade
- cavity
- face
- lower cover
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a kind of carbon fibre composite axial flow fan vane wheel shaping solidification equipment.Its lower cover bottom surface is provided with composite material blade solidification cavity, and the side being engaged of upper and lower cover is equipped with slew gear, is located at turn around the opposite side that the upper and lower cover of mechanism is engaged and is provided with locking device；Upper cap bore in the middle of respective composite material blade solidification cavity is inserted into pressurizeing or vacuumizing adapter；Sealing ring is formed around along the upper and lower cover faying face outside blade cures cavity；Blade cures cavity after being locked by upper and lower cover inserts surrounding to be had in the cavity of heater, and heater is externally provided with heat-insulation layer, and the cavity side of heater is provided with the solidification equipment door for the turnover of blade cures cavity.Bian of the present invention quick unlatching and the structure of quick connection sealing, purpose of the realization to the quick turnover of impeller solidification；Multiple blade cures device cavitys can be opened up, batch production is realized；It is provided with pressurization or vacuumizes adapter, improves the combined strength bination and rigidity of blade.
Description
Technical field
The present invention relates to solidification equipment, more particularly, to a kind of carbon fibre composite axial flow fan vane wheel forming and hardening dress
Put.
Background technology
High-strength carbon fiber composite has designability, easily processed into type with its lightweight, high intensity, material property
And be widely used in the structures such as space flight and aviation, aircraft, impeller, carbon fiber and its composite product are to develop in the world at present
One of hitech materials the swiftest and the most violent.With the decline and the increase of yield of carbon fiber price, current carbon fibre composite
Commercial market is progressively moved towards, such as wind power generator impeller, compressor impeller, various propeller impellers is adopted more and more
With carbon fibre composite, the solidification equipment of carbon fibre composite is to produce the essential equipment of such material, is to determine
The visual plant of carbon fibre composite quality and performance, the height of its production efficiency, the controllability of curing process and composite wood
Cost of material etc. has very strong relevance.
For different composite products, due to the diversity of its shape of product, the difference of curing process often solidifies
Device would also vary from, namely with stronger specific aim, therefore the structure of curing oven is many with regard to species, carbon fiber composite
Material impeller solidification equipment is a kind of device for exclusively carrying out impeller solidification.
Solidification equipment research both at home and abroad to composite is more, and tiger is brought up such as automation Science and Technology Ltd. of Suzhou day nation
201220419291.4 " a kind of epoxy resin cure stoves " for proposing, using axial flow blower by electric-heating-wire-heating, so as to heat this
Individual curing oven, reaches solidification temperature, and it is mainly using the wiring board resin solidification towards electron trade, and electronic component resin
Solidification.A kind of such as 201410455638.4 " aeroplane engines of the Liu Wanzhu propositions of Xi'an Aero-engine Corporation Ltd
The manufacture method of machine composite material fan blade ", although be also the manufacture method and equipment of a kind of fan blade, but manufacture work
Skill is but different from the present invention, and the invention uses pre-buried fiber, and the technique that resin by injection is solidified also uses mold cured,
Efficiency is higher.A kind of 201510046752.6 " carbon fibers of the propositions such as Zhejiang Bei Ou composites Manufacturing Co., Ltd Jia Ximing
The forming method of composite material tube ", using prepreg fiber, coiling forms pipeline on roll shaft, so as to carry out solidifying to form pipe
Road, its grinding tool and shaping jig are both needed to the shape of speciality.The propositions such as Zhongfu Shenying Carbon Fiber Limited Liability Company's Zhang Guoliang
200910234311.3 " a kind of preparation methods of CFC-based raising roller ", core is wound into using carbon fiber fabric
On, it is cured after, a kind of hair roll structure of machine-shaping.Soldier of enamel glass fiber Co., Ltd of Xiuqian City day land one etc. proposes
201410545454.7 " a kind of production resin coating of glass mat and solidification equipments ", proposition makes glass using continuous roller
Glass fiber band completes the production technology of the processes such as coated with resins, solidification in rolling process, and the technique is adapted to production belt product.
" resin-based carbon fiber composite truss member connects the CN201210570322.0 of Harbin Institute of Technology Tan Hui rich grade propositions
Connecing method " carbon fiber fibre bundle is wound to truss member connecting portion, then solidified, and this connected mode is to bar
The connection of part class formation is effective and feasible.Above technology both for the design of particular composite product solidification equipment, though
So also there is the solidification function of carbon fibre composite, but may not apply to solidification and the batch of carbon fibre composite impeller
Production, particularly with relatively thin and complicated impeller, it is necessary to pressurize or vacuum carry out aid in solidification composite material impeller.
The content of the invention
It is multiple it is an object of the invention to provide a kind of carbon fiber in order to using the Production requirement of carbon fibre composite impeller
Condensation material axial flow fan vane wheel forming and hardening device, the device can be realized to the quick of impeller solidification, batch, high-quality need
Ask.
The technical solution adopted by the present invention is as follows：
Lower cover bottom surface of the invention is provided with the composite material blade solidification cavity of 1 or more than 1, upper lid and lower cover
The side being engaged is equipped with slew gear, is located at turn around the opposite side that the upper lid and lower cover of mechanism be engaged and is provided with locking dress
Put；Pressurization is inserted respectively in the upper cap bore in the middle of respective composite material blade solidification cavity or vacuumizes adapter；Along blade
Upper lid outside solidification cavity is formed around sealing ring with lower cover faying face；By by the blade cures cavity after Shang Gai and lower cover locking
Inserting surrounding has in the cavity of heater, and heater is externally provided with heat-insulation layer, and the cavity side of heater is provided with and supplies leaf
The solidification equipment door of piece solidification cavity turnover.
The shape of the composite material blade solidification cavity is identical with the shape of blade, because the shape of blade is continuous light
Sliding curved surface, the specific dot profile of its curved surface must is fulfilled for claimed below：
When axial flow fan vane wheel radius R is 250mm, the profile in vane nose face is：Its side long is by two isocentric circular arcs
Constitute, radius R is respectively 143.83mm and 144.83mm, and two short sides are the straight line of 1mm, the median plane length of front end face
It is 97.42mm, the median plane of front end face is 19.1 ° with the angle of the section constitution perpendicular to impeller Pivot axle, section position
Between 9 °~-12.5 °；
When axial flow fan vane wheel radius R is 212.5mm, the cross section profile of blade is：The side long in section is concentric by two
Circular arc is constituted, and radius R is respectively 144.21mm and 145.21mm, and two short sides are the straight line of 1mm, kernel of section face length
It is 101.12mm, kernel of section face is 19.2 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 11.5 °~-15.5 °；
When axial flow fan vane wheel radius R is 187.75mm, the cross section profile of blade is：The side long in section is concentric by two
Circular arc is constituted, and radius R is respectively 143.45mm and 144.45mm, and two short sides are the straight line of 1mm, kernel of section face length
It is 102.85mm, kernel of section face is 19.4 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 11 °~-18 °；
When axial flow fan vane wheel radius R is 125mm, the cross section profile of blade is：The side long in section is by two concentric circles
Arc is constituted, and radius R is respectively 145.25mm and 146.25mm, and two short sides are the straight line of 1mm, and kernel of section face length is
104.66mm, kernel of section face is 19.7 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 19.5 °~-28 °；
When axial flow fan vane wheel radius R is 65mm, the profile in blade rear end face is：Its side long is by two isocentric circular arc structures
Into radius R is respectively 154.25mm and 155.25mm, and two short sides are the straight line of 1mm, and the median plane length of rear end face is
107.17mm, the median plane of rear end face is 20.3 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 39 °~-52 °.
In the cavity of the heater, heating carrier is the heating of electrical heating, heating using microwave or steam, the chamber of heater
It is additionally provided with automatic temperature control system in vivo.
The bottom of the lower cover is equipped with is easy to mobile roller.
The locking device is the combination opened bolt soon and open nut soon.
The invention has the advantages that：
1) purpose of rapid shaping can be realized, to specifying the shape of impeller by setting unified solidification cavity, upper lid
With lower cover using the structure that can quickly open and quickly connect sealing, the purpose of the quick turnover to impeller solidification is realized.
2) multiple blade cures device cavitys can be opened up between upper and lower cover as needed, batch production is realized
Purpose
3) it is provided with the pressurization of technique needs and vacuumizes adapter, different resin solidifications is pressurizeed, is vacuumized, or
Compound action is pressurizeed and vacuumized, the bubble implied in carbon fibre composite blade is excluded, the intensity of compound posterior lobe thousand is improved
And rigidity, so as to improve composite material impeller high-quality.
Brief description of the drawings
Fig. 1 is carbon fibre composite impeller Quick-forming solidification equipment structural representation of the invention.
Fig. 2 is the partial top view of Fig. 1.
Fig. 3 is a structural representation for composite material blade.
Fig. 4 is the side view of Fig. 3 blades.
Fig. 5 is Fig. 3 composite material blade a-a cross sectional shape figures.
Fig. 6 is Fig. 3 composite material blade b-b cross sectional shape figures.
Fig. 7 is Fig. 3 composite material blade c-c cross sectional shape figures.
Fig. 8 is Fig. 3 composite material blade d-d cross sectional shape figures.
Fig. 9 is Fig. 3 composite material blade e-e cross sectional shape figures.
In figure：1st, roller, 2, heat-insulation layer, 3, lower cover, 4, sealing ring, 5, solidification equipment door, 6, open nut soon, 7, open spiral shell soon
Bolt, 8, handle, 9, blade cures cavity, 10, heater, 11, pressurize or vacuumize adapter, 12, upper lid, 13, slew gear.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1 and Figure 2, the present invention solidifies chamber in the composite material blade that the bottom surface of lower cover 3 is provided with 1 or more than 1
Body 9 (has 3) in Fig. 2, the side being engaged of upper lid 12 and lower cover 3 is equipped with slew gear 13 (having 2 in Fig. 2), makes lid
12 can rotate along slew gear 13 and reach opening and close, and the upper lid 12 and lower cover 3 for being located at turn around mechanism 13 are engaged
Opposite side locking device is installed；Inserted respectively in the hole of upper lid 12 in the middle of respective composite material blade solidification cavity 9
Pressurize or vacuumize adapter 11；Upper lid 12 outside along blade cures cavity 9 is formed around sealing ring 4 with the faying face of lower cover 3, makes leaf
Piece solidification cavity can pressurize or vacuumize；Blade cures cavity is set to pressurize or vacuumize；To be locked by upper lid 12 and lower cover 3
Blade cures cavity afterwards inserts surrounding to be had in the cavity of heater 10, and heater 10 is externally provided with heat-insulation layer 2, heating dress
The cavity side for putting 10 is provided with the solidification equipment door 5 passed in and out for blade cures cavity, and upper lid 12 is fitted with handle 8.
In the cavity of the heater 10, heating carrier is the heating of electrical heating, heating using microwave or steam, heater
Automatic temperature control system is additionally provided with cavity, cavity inner temperature is worked at a set temperature.
The bottom of the lower cover 3 is equipped with is easy to mobile roller 1.
The locking device is the combination (having 3 in Fig. 2) opened bolt 7 soon and open nut 6 soon.
The carbon fibre composite impeller solidifies cavity, is a closed pressure-resistant cavity, and the cavity can bear pressure
Power or vacuum, pressurization is needed or during vacuum when curing process, pressure needed for being applied by pressurizeing or vacuumize adapter or
Person vacuumizes.
The carbon fiber that the present invention is designed according to intensity requirement lays angle-determining, the impeller that the number of plies determines, inserts leaf
In piece solidification cavity, after upper lid, lower cover are closed, tighten and open nut soon, be heated to solidification temperature, work is solidified according to resin matrix
The difference of skill, can pressurize or vacuumize to blade cures cavity respectively, to after hardening time, be covered in opening, take out solidification
Blade afterwards, is then processed to blade, obtains required blade dimensions.
The shape of the composite material blade solidification cavity is identical with the shape of blade, because the shape of blade is continuous light
Sliding curved surface, the specific dot profile of its curved surface must is fulfilled for claimed below：
As shown in Fig. 3, Fig. 4, Fig. 5, when axial flow fan vane wheel radius R is 250mm, the profile in vane nose face is：Its
Side long is made up of two isocentric circular arcs, and radius R is respectively 143.83mm and 144.83mm, and two short sides are the straight line of 1mm,
The median plane length of front end face is 97.42mm, the median plane of front end face and the section constitution perpendicular to impeller Pivot axle
Angle is 19.1 °, and section is located between 9 °~-12.5 °.
As shown in Fig. 3, Fig. 4, Fig. 6, when axial flow fan vane wheel radius R is 212.5mm, the cross section profile of blade is：Cut
The side long in face is made up of two isocentric circular arcs, and radius R is respectively 144.21mm and 145.21mm, and two short sides are 1mm's
Straight line, kernel of section face length is the folder of 101.12mm, kernel of section face and the section constitution perpendicular to impeller Pivot axle
Angle is 19.2 °, and section is located between 11.5 °~-15.5 °.
As shown in Fig. 3, Fig. 4, Fig. 7, when axial flow fan vane wheel radius R is 187.75mm, the cross section profile of blade is：Cut
The side long in face is made up of two isocentric circular arcs, and radius R difference 143.45mm and 144.45mm, two short sides are the straight of 1mm
Line, kernel of section face length is the angle of 102.85mm, kernel of section face and the section constitution perpendicular to impeller Pivot axle
It it is 19.4 °, section is located between 11 °~-18 °.
As shown in Fig. 3, Fig. 4, Fig. 8, when axial flow fan vane wheel radius R is 125mm, the cross section profile of blade is：Section
Side long be made up of two isocentric circular arcs, radius R is respectively 145.25mm and 146.25mm, and two short sides are the straight of 1mm
Line, kernel of section face length is the angle of 104.66mm, kernel of section face and the section constitution perpendicular to impeller Pivot axle
It it is 19.7 °, section is located between 19.5 °~-28 °.
As shown in Fig. 3, Fig. 4, Fig. 9, when axial flow fan vane wheel radius R is 65mm, the profile in blade rear end face is：Its length
While being made up of two isocentric circular arcs, radius R is respectively 154.25mm and 155.25mm, and two short sides are the straight line of 1mm, after
The median plane length of end face is the folder of 107.17mm, the median plane of rear end face and the section constitution perpendicular to impeller Pivot axle
Angle is 20.3 °, and section is located between 39 °~-52 °.
The folder of the blade profile center facial plane of impeller of the invention and the section constitution perpendicular to impeller Pivot axle
Angle is 5~70 °
The structure of specific embodiment is as follows：
As shown in Fig. 2 being that an impeller diameter Φ is 3 solidifications of blade on the carbon fibre composite impeller of 500mm
Cavity position, is the planform size of one of blade as shown in Figure 3, Figure 4, and blade is symmetrical compound using 8 layers, is combined
Mode is（0 ,+45, -45,90）S, using T300/ epoxy resin composite materials, solidification temperature is 150 DEG C, and hardening time is 1 small
When, natural cooling in air.Moulding pressure described in the present embodiment is 0.8MPa, and when evacuated, vacuum is 300Pa.
Above-mentioned specific embodiment is used for illustrating the present invention, rather than limiting the invention, of the invention
In spirit and scope of the claims, any modifications and changes made to the present invention both fall within protection model of the invention
Enclose.
Claims (3)
1. a kind of carbon fibre composite axial flow fan vane wheel shapes solidification equipment, it is characterised in that：Lower cover bottom surface be provided with 1 with
On composite material blade solidification cavity, the side being engaged of upper lid and lower cover is equipped with slew gear, is located at turn around mechanism
The opposite side that upper lid and lower cover are engaged is provided with locking device；Upper lid in the middle of respective composite material blade solidification cavity
Pressurization is inserted in hole respectively or adapter is vacuumized；Upper lid outside along blade cures cavity is formed around sealing with lower cover faying face
Circle；Have surrounding is inserted by the blade cures cavity after Shang Gai and lower cover locking in the cavity of heater, outside heater
Heat-insulation layer is provided with, the cavity side of heater is provided with the solidification equipment door for the turnover of blade cures cavity；
The shape of the composite material blade solidification cavity is identical with the shape of blade, because the shape of blade is bent continuous and derivable
Face, the specific dot profile of its curved surface must is fulfilled for claimed below：
When axial flow fan vane wheel radius R is 250mm, the profile in vane nose face is：Its side long is made up of two isocentric circular arcs,
Radius R is respectively 143.83mm and 144.83mm, and two short sides are the straight line of 1mm, and the median plane length of front end face is
97.42mm, the median plane of front end face is 19.1 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 9 °~-12.5 °；
When axial flow fan vane wheel radius R is 212.5mm, the cross section profile of blade is：The side long in section is by two isocentric circular arcs
Constitute, radius R is respectively 144.21mm and 145.21mm, and two short sides are the straight line of 1mm, and kernel of section face length is
101.12mm, kernel of section face is 19.2 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 11.5 °~-15.5 °；
When axial flow fan vane wheel radius R is 187.75mm, the cross section profile of blade is：The side long in section is by two isocentric circular arcs
Constitute, radius R is respectively 143.45mm and 144.45mm, and two short sides are the straight line of 1mm, and kernel of section face length is
102.85mm, kernel of section face is 19.4 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at 11 °
Between~-18 °；
When axial flow fan vane wheel radius R is 125mm, the cross section profile of blade is：The side long in section is by two isocentric circular arc structures
Into radius R is respectively 145.25mm and 146.25mm, and two short sides are the straight line of 1mm, and kernel of section face length is
104.66mm, kernel of section face is 19.7 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 19.5 °~-28 °；
When axial flow fan vane wheel radius R is 65mm, the profile in blade rear end face is：Its side long is made up of two isocentric circular arcs,
Radius R is respectively 154.25mm and 155.25mm, and two short sides are the straight line of 1mm, and the median plane length of rear end face is
107.17mm, the median plane of rear end face is 20.3 ° with the angle of the section constitution perpendicular to impeller Pivot axle, and section is located at
Between 39 °~-52 °；
In the cavity of the heater, heating carrier is the heating of electrical heating, heating using microwave or steam, in the cavity of heater
It is additionally provided with automatic temperature control system.
2. a kind of carbon fibre composite axial flow fan vane wheel according to claim 1 shapes solidification equipment, and its feature exists
In：The bottom of the lower cover is equipped with is easy to mobile roller.
3. a kind of carbon fibre composite axial flow fan vane wheel according to claim 1 shapes solidification equipment, and its feature exists
In：The locking device is the combination opened bolt soon and open nut soon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510383933.8A CN104943202B (en) | 2015-07-03 | 2015-07-03 | Carbon fibre composite axial flow fan vane wheel forming and hardening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510383933.8A CN104943202B (en) | 2015-07-03 | 2015-07-03 | Carbon fibre composite axial flow fan vane wheel forming and hardening device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104943202A CN104943202A (en) | 2015-09-30 |
| CN104943202B true CN104943202B (en) | 2017-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510383933.8A Expired - Fee Related CN104943202B (en) | 2015-07-03 | 2015-07-03 | Carbon fibre composite axial flow fan vane wheel forming and hardening device |
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| CN (1) | CN104943202B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI647350B (en) * | 2017-07-19 | 2019-01-11 | 翁慶隆 | Carbon fiber tow forming device and carbon fiber tow forming method |
| CN107175785A (en) * | 2017-07-28 | 2017-09-19 | 安徽卓尔航空科技有限公司 | A kind of composite propeller curing oven of built-in rotating mechanism |
| CN109501320A (en) * | 2018-12-21 | 2019-03-22 | 成都易华天宇试验设备有限责任公司 | A kind of curing oven suitable for solidifying aerospace composite |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1644917A (en) * | 2005-01-21 | 2005-07-27 | 同济大学 | Large pneumatic equipment blades made of composite material and production thereof |
| CN200996390Y (en) * | 2006-12-30 | 2007-12-26 | 北京明力西蒙制冷设备有限公司 | Impeller combination for disrotatory axial-flow fan |
| CN102922621A (en) * | 2012-11-23 | 2013-02-13 | 中国科学院宁波材料技术与工程研究所 | Production method for automobile roof made of fiber reinforced composite material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4919739A (en) * | 1986-11-07 | 1990-04-24 | Basf Aktiengesellschaft | Production of improved preimpregnated material comprising a particulate thermosetting resin suitable for use in the formation of a substantially void-free fiber-reinforced composite article |
-
2015
- 2015-07-03 CN CN201510383933.8A patent/CN104943202B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1644917A (en) * | 2005-01-21 | 2005-07-27 | 同济大学 | Large pneumatic equipment blades made of composite material and production thereof |
| CN200996390Y (en) * | 2006-12-30 | 2007-12-26 | 北京明力西蒙制冷设备有限公司 | Impeller combination for disrotatory axial-flow fan |
| CN102922621A (en) * | 2012-11-23 | 2013-02-13 | 中国科学院宁波材料技术与工程研究所 | Production method for automobile roof made of fiber reinforced composite material |
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