CN104454339A - Vertical axis draught fan impeller based on bevel gear transmission - Google Patents
Vertical axis draught fan impeller based on bevel gear transmission Download PDFInfo
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- CN104454339A CN104454339A CN201410673385.8A CN201410673385A CN104454339A CN 104454339 A CN104454339 A CN 104454339A CN 201410673385 A CN201410673385 A CN 201410673385A CN 104454339 A CN104454339 A CN 104454339A
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- bevel gear
- baffle
- shaft
- fan impeller
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- 230000005540 biological transmission Effects 0.000 title abstract 2
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000010248 power generation Methods 0.000 abstract description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor
- F03D3/06—Rotors
- F03D3/062—Rotors characterised by their construction elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a vertical axis draught fan impeller based on bevel gear transmission. The vertical axis draught fan impeller comprises a main shaft, a first bearing pedestal, a first baffle, a second baffle, a first bevel gear, a second bevel gear, a second bearing pedestal, a third bevel gear, a fourth bevel gear, a first blade, a second blade, a third blade and a fourth blade. The positions of the blades can be changed through regular rotation when the impeller blades rotate around the axis, and a draught fan has the good self-starting performance and high power generation efficiency.
Description
Technical field
The invention belongs to technical field of wind power generation, be specifically related to a kind of vertical shaft fan impeller based on bevel gear drive.
Background technique
The energy is power and the guarantee of human social development progress.In recent years, along with the high speed development of global economy, coal, oil, the conventional energy resources such as rock gas are by fast, and a large amount of consumption, this allows the mankind not only in the face of the increasingly exhausted pressure of resource, receives the threat that environment constantly worsens simultaneously.The energy and environmental protection have become the pressing problem that mankind nowadays survival and development are badly in need of solving.Wind-powered electricity generation is as a kind of new energy of clean environment firendly, neither consume limited coal resources, also valuable underground wind-resources can not be consumed, more be conducive to the sustainable development of national economy, district greatly develops the wind power plant of the high efficient and reliable of applicable concrete area feature is throughout the country coming.Realize the industrialization of wind-power electricity generation, practical, require dynamical Fan Product, can utilize wind energy to greatest extent, this just requires that we study the performance of wind energy conversion system, improves blower fan and catches the maximum of wind energy, produces efficient energy and transforms.
At present, the principal mode of wind-power electricity generation is electric energy by blower fan apparatus by wind energy transformation, therefore design a kind of efficient, reliably blower fan be the key technology of Wind Power Utilization.The moulding of blower fan should consider that structure also will consider the other factorses such as weight.Current blower fan form mainly contains the flat axle blower fan of wind and vertical shaft fan two kinds, what impeller axis was parallel with the relative position of wind direction is the flat axial impeller of wind (HAWT), and that impeller axis is vertical with the relative position of wind direction is perpendicular axis type impeller (VAWT).
Same level axle Wind turbines is compared, and vertical axis wind electric unit has following advantage:
(1) perpendicular axis type impeller axis is with to carry out flow path direction vertical, can catch the wind energy in any direction, and structure is simple, is well suited for miniaturization Independent Power Generation.
(2) vertical shaft fan installation and maintenance is simple, and manufacturing process is simple, and cost is low, and Economy is strong.
(3) vertical shaft fan to blade structure and requirement of strength low.
(4) perpendicular axis type impeller can be effectively worked at complicated turbulent flow, is therefore more suitable for the small-size wind power-generating place being applied in complex-terrain, as the rural area of remote districts.
(5) tip-speed ratio wind flat axle impeller little of vertical axis impeller blade, under such slow-speed of revolution, aerodynamic noise is very little, even can reach quiet effect, be conducive to environmental protection.
Vertical axis impeller common at present mainly contains lift vertical shaft impeller and resistance-type vertical axis impeller.The main representative of lift-type is Darrieus impeller, and the main representative of resistance type is Savonius impeller.
Be in the innovation and creation of US1835018A at publication number, disclose a kind of Darrieus wind-force impeller.This blade wheel structure is simple, lift coefficient is high, but startability is poor, is difficult to especially at low wind speeds start.
Be in the innovation and creation of US1766765A at publication number, disclose a kind of Savonius wind-force impeller.This impeller startability is good, has very large wind speed and utilizes scope, but along with the rotation of rotor, its torque amplitude of variation is from high to low very large, even can drop to the degree close to zero, therefore have lower total efficiency.
Simultaneously, Tian Wenlong discloses a kind of moving vane type vertical shaft fan impeller in a literary composition of " a kind of numerical simulation of new vertical shaft type draught fan impeller " of " mechanical engineering journal " 18 phases in 2013, impeller is installed multiple board-type moving vane, blade while installation shaft revolution around self installation shaft rotation, but the total efficiency of this impeller is still lower.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of vertical shaft fan impeller based on bevel gear drive.
Technological scheme
Based on a vertical shaft fan impeller for bevel gear drive, it is characterized in that comprising main shaft, clutch shaft bearing seat, the first baffle plate, second baffle, the first bevel gear, the second bevel gear, the second bearing support, third hand tap gear, the 4th bevel gear, the first blade, the second blade, Three-blade and quaterfoil; First baffle plate, second baffle are fixed on main shaft respectively by the mounting hole at respective center, orthogonal in cross; First blade is by installing bearing in 2 rectangular openings on the long limit at its projecting shaft place and bearing support is vertically mounted on a limit of the first baffle plate, the outer peripheral end surfaces of the first blade exceeds the long edge lengths of blade of baffle edge end face 0.2 times, Three-blade and the first blade in 90 ° and be arranged on another limit of the first baffle plate about spindle centerline axisymmetric; Second blade is by installing bearing in 2 rectangular openings on the long limit at its projecting shaft place and bearing support is vertically mounted on a limit of second baffle, the outer peripheral end surfaces of the second blade exceeds the long edge lengths of blade of baffle edge end face 0.2 times, quaterfoil and the second blade in 90 ° and be arranged on another limit of second baffle about spindle centerline axisymmetric; The projecting shaft of the first blade is connected the first bevel gear, second bevel gear engages with the first bevel gear, second bevel gear and third hand tap gear are coaxially fixed together by an axle, third hand tap gear engages with the 4th bevel gear, 4th bevel gear is connected on three-vaned projecting shaft, and it is secondary that the first described bevel gear, the second bevel gear, third hand tap gear and the 4th bevel gear constitute a secondary bevel gear drive; Second blade is connected with the bevel gear drive pair of quaterfoil by same structure.
Described main shaft is cylindric.
The first described baffle plate, second baffle are Z-type thin plate, and the first baffle plate upper surface is 5 times of major axis diameter length apart from mainshaft end face, and second baffle is positioned at the bevel gear diametrical position place of immediately below the first baffle plate 1.5 times.
The first described blade, the second blade, Three-blade and quaterfoil are rectangular thin plate, and its long limit and width edge length are than being 2:1.
The first described bevel gear position is apart from projecting shaft end face 1.5 times of bevel gear diameter length places, and the conical surface outwardly.
The diameter of output shaft is 0.75 times of vane thickness.
Three-blade is identical with quaterfoil projecting shaft length, grows the diameter of 5 times of projecting shafts than the first blade and the second blade projecting shaft length.
The central position of two rectangular openings is 1/4th and 3/4ths of length of blade to the distance of blade broadside.
Beneficial effect
A kind of vertical shaft fan impeller based on bevel gear drive that the present invention proposes, impeller blade, also can be regular from transferring the position changing blade while pivoting, and makes blower fan have good self-starting and generating efficiency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 baffle arrangement schematic diagram
The secondary schematic diagram of Fig. 3 bevel gear drive
Fig. 4 is fundamental diagram of the present invention
In figure: 1-main shaft; 2-clutch shaft bearing seat; 3-first baffle plate; 4-second baffle; 5-first bevel gear; 6-second bevel gear; 7 second bearing supports; 8-third hand tap gear; 9-the 4th bevel gear; 10-first blade; 11-second blade, 12-Three-blade; 13-quaterfoil.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
As shown in Figure 1, a kind of vertical shaft fan impeller based on bevel gear drive, primarily of main shaft 1, clutch shaft bearing seat 2, first baffle plate 3, second baffle 4, first bevel gear 5, second bevel gear 6, second bearing support 7, third hand tap gear 8, the 4th bevel gear 9, first blade 10, second blade 11, Three-blade 12 and quaterfoil 13 form.
Main shaft 1 is cylindric, can rotate freely around own axes.First baffle plate 3 is Z-type thin plate, a mounting hole is had at the center of the first baffle plate 3, by this mounting hole, the first baffle plate 3 is fixed on main shaft 1, and the first baffle plate 3 upper surface is 5 times of major axis diameter length apart from main shaft 1 top end, the bevel gear diametrical position place of immediately below the first baffle plate 3 1.5 times is in like manner placed on by the mounting hole of second baffle 4, and keep the first baffle plate 3 and second baffle 4 orthogonal in cross, and install in the plan view of rear impeller, the first baffle plate 3 is just all remaining " Z " shape with second baffle 4.
First blade 10, second blade 11, Three-blade 12, quaterfoil 13 are rectangular thin plate, and its long limit and width edge length are than being 2:1.A thin axle is stretched out on a long limit of blade, and the diameter of thin axle is 0.75 times of vane thickness., the first blade 10 and the second blade 11 projecting shaft length grow the diameter of 5 times of axles on year-on-year basis mutually for Three-blade 12 and quaterfoil projecting shaft length.Dug two rectangular openings in the side, long limit of four pieces of blade projecting shafts, the central position of two rectangular openings is 1/4th and 3/4ths of length of blade to the distance of blade broadside.First blade 10 is along the first baffle plate 3 while place, and reserving the distance of laying bearing is projecting shaft half path length.The long limit of blade is parallel to the long limit of the first baffle plate 3, and ensures that the first blade 10 is perpendicular to baffle plate.The outer peripheral end surfaces of the first blade 10 exceeds the long edge lengths of blade of baffle edge end face 0.2 times.Three-blade 12 is similar to the first blade modes of emplacement, and the first blade 10 and Three-blade 12 position are about spindle centerline axisymmetric, and Three-blade 12 is parallel to baffle plate, simultaneously Three-blade 12 direction of toppling over is towards the large side of baffle plate area, be arranged on rectangular opening place finally by bearing and clutch shaft bearing seat 2, two blades be connected on the first baffle plate 3.
With Three-blade 12, the first blade 10 mounting type is the same, and the second blade 11 and quaterfoil 13 position, also about main shaft 1 axis for axis symmetry, are connected on second baffle 4 by bearing and clutch shaft bearing seat 2, and mutual installation in 90 °.The close long limit of baffle plate, four blade projecting shaft places is non-conterminous mutually.
As shown in Figure 3, the first bevel gear 5 is connected on the projecting shaft of the first blade 10, and its position is apart from projecting shaft end face 1.5 times of bevel gear diameter length places, and the conical surface outwardly.Second bevel gear 6 and third hand tap gear 8 are coaxially fixed together by an axle, and the conical surface is outside.This coaxial double face bevel gear is affixed on the first baffle plate 3 by bearing and the second bearing support 7.Keep the first bevel gear 5 to engage with the second bevel gear 6, third hand tap gear 8 engages with the 4th bevel gear 9, and the 4th bevel gear 9 is connected be arranged on Three-blade 12 projecting shaft on.
Another width bevel gear drive is in like manner installed on the second blade and four-bladed projecting shaft secondary.
As shown in Figure 4, impeller rotates under the action of the forces of the wind along clockwise direction.Turn in the process of D point by B point through A point at the first blade 10, first blade 10 side wind-engaging drag effect windward, this resistance makes the first blade 10 have the trend retreated down, but because now Three-blade 12 has been fitted on the first baffle plate 3, limit toppling over of the first blade 10, first blade 10 is kept upright state, produces the clockwise moment around main shaft 1, drive main shaft 1 clockwise around central axle to rotate.
When impeller further rotates, namely the first blade 10 turns in the process of B point by D point through C point, and the originally leeward side of the first blade 10 becomes windward side and wind-engaging drag effect.This resistance makes the first blade 9 topple over backward, now the projecting shaft of the first blade 10 drives the first bevel gear 5 (from stretching out axle head) to rotate counterclockwise, the second bevel gear 6 and third hand tap gear 8 is caused to rotate clockwise, third hand tap gear 8 drives the 4th bevel gear 9 to rotate counterclockwise, thus Three-blade 12 erects.Turn in the process of B point by D point through C point at the first blade 10, the first blade 10 and wind direction keeping parallelism, resistance is less; Three-blade 12 then turns to D point by B point through A point accordingly, and in this process, Three-blade 12 is kept upright, and the driving torque of generation is larger.
Second blade 11 is identical with the kinematic relation of Three-blade 12 with the first blade 10 with the kinematic relation of quaterfoil 13, and namely main shaft often turns over 180 °, and the attitude of the second blade 11 and quaterfoil 13 all can produce a checker.
Under the effect that incoming flow impacts, two to the blade alternate being mutually 90 degree upright with topple over.Carrying out flow path direction, the windward side effect of being hit of upstanding fins promotes main shaft and rotates, and opposite side topples over blade under Z-shaped baffle effect, keeps the bevel gear pair of connection two blade to maintain static dynamic.When main shaft turns over 180 degree, the lee face of upstanding fins towards carrying out flow path direction, under wind-force effect, through bevel gear drive, upstanding fins with topple over blade and exchange attitude, and repeat said process.Reaching maximum at downbeam vane stress area like this, reach minimum at countercurrent direction vane stress area, thus produce the moment promoting main axis, by conversion equipment, is electric energy by momentum transformation.Apparatus structure is simply compact, and institute takes up space little, is easy to start, greatly increases the efficiency of impeller.
Claims (8)
1., based on a vertical shaft fan impeller for bevel gear drive, it is characterized in that comprising main shaft (1), clutch shaft bearing seat (2), the first baffle plate (3), second baffle (4), the first bevel gear (5), the second bevel gear (6), the second bearing support (7), third hand tap gear (8), the 4th bevel gear (9), the first blade (10), the second blade (11), Three-blade (12) and quaterfoil (13), first baffle plate (3), second baffle (4) are fixed on main shaft (1) respectively by the mounting hole at respective center, orthogonal in cross, first blade (10) is by installing bearing in 2 rectangular openings on the long limit at its projecting shaft place and bearing support (2) is vertically mounted on a limit of the first baffle plate (3), the outer peripheral end surfaces of the first blade (10) exceeds the long edge lengths of blade of baffle edge end face 0.2 times, and Three-blade (12) and the first blade (10) are in 90 ° and be arranged on another limit of the first baffle plate (3) about main shaft (1) centerline axis symmetry, second blade (11) is by installing bearing in 2 rectangular openings on the long limit at its projecting shaft place and bearing support (2) is vertically mounted on a limit of second baffle (4), the outer peripheral end surfaces of the second blade (11) exceeds the long edge lengths of blade of baffle edge end face 0.2 times, and quaterfoil (13) and the second blade (11) are in 90 ° and be arranged on another limit of second baffle (4) about main shaft (1) centerline axis symmetry, the projecting shaft of the first blade (10) is connected the first bevel gear (5), second bevel gear (6) engages with the first bevel gear (5), second bevel gear (6) and third hand tap gear (8) are coaxially fixed together by an axle, third hand tap gear (8) engages with the 4th bevel gear (9), 4th bevel gear (9) is connected on the projecting shaft of Three-blade (12), described the first bevel gear (5), second bevel gear (6), it is secondary that third hand tap gear (8) and the 4th bevel gear (9) constitute a secondary bevel gear drive, second blade (11) is connected with the bevel gear drive pair of quaterfoil (13) by same structure.
2. the vertical shaft fan impeller based on bevel gear drive according to claim 1, is characterized in that described main shaft (1) is for cylindric.
3. the vertical shaft fan impeller based on bevel gear drive according to claim 1, it is characterized in that described the first baffle plate (3), second baffle (4) is Z-type thin plate, first baffle plate (3) upper surface is 5 times of major axis diameter length apart from main shaft (1) top end, and second baffle (4) is positioned at the bevel gear diametrical position place of immediately below the first baffle plate (3) 1.5 times.
4. the vertical shaft fan impeller based on bevel gear drive according to claim 1, it is characterized in that described the first blade (10), the second blade (11), Three-blade (12) and quaterfoil (13) are rectangular thin plate, its long limit and width edge length are than being 2:1.
5. the vertical shaft fan impeller based on bevel gear drive according to claim 1, it is characterized in that described the first bevel gear (5) position is apart from projecting shaft end face 1.5 times of bevel gear diameter length places, the conical surface outwardly.
6. the vertical shaft fan impeller based on bevel gear drive according to claim 1, is characterized in that the diameter of output shaft is 0.75 times of vane thickness.
7. the vertical shaft fan impeller based on bevel gear drive according to claim 1, it is characterized in that Three-blade (12) is identical with quaterfoil projecting shaft length, the diameter of 5 times projecting shafts longer than the first blade (10) and the second blade (11) projecting shaft length.
8. the vertical shaft fan impeller based on bevel gear drive according to claim 1, is characterized in that the central position of two rectangular openings is 1/4th and 3/4ths of length of blade to the distance of blade broadside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673385.8A CN104454339A (en) | 2014-11-21 | 2014-11-21 | Vertical axis draught fan impeller based on bevel gear transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673385.8A CN104454339A (en) | 2014-11-21 | 2014-11-21 | Vertical axis draught fan impeller based on bevel gear transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104454339A true CN104454339A (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410673385.8A Pending CN104454339A (en) | 2014-11-21 | 2014-11-21 | Vertical axis draught fan impeller based on bevel gear transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104454339A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114162337A (en) * | 2021-11-27 | 2022-03-11 | 西北工业大学 | Windshield system for reducing oil-spraying lubrication wind resistance loss of high-speed spiral bevel gear |
| CN114576188A (en) * | 2022-02-23 | 2022-06-03 | 浙江尔格科技股份有限公司 | Fan capable of automatically adjusting wind direction for heat exchanger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2659391A1 (en) * | 1990-03-06 | 1991-09-13 | Riviere Jacques | Wind-powered motor with oriented sails |
| DE4313703A1 (en) * | 1993-04-27 | 1994-11-03 | Ferenc Tabori | Wind wheel having a horizontal blade (vane) |
| CN201250756Y (en) * | 2008-09-18 | 2009-06-03 | 张延民 | Dual-vertical-shaft mutual-compensation windmill |
| CN102251920A (en) * | 2011-06-20 | 2011-11-23 | 廖宝书 | Rudder direction changing impeller machine |
| CN203248312U (en) * | 2013-04-16 | 2013-10-23 | 郭忠礼 | Wind power collecting device for vehicles |
-
2014
- 2014-11-21 CN CN201410673385.8A patent/CN104454339A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2659391A1 (en) * | 1990-03-06 | 1991-09-13 | Riviere Jacques | Wind-powered motor with oriented sails |
| DE4313703A1 (en) * | 1993-04-27 | 1994-11-03 | Ferenc Tabori | Wind wheel having a horizontal blade (vane) |
| CN201250756Y (en) * | 2008-09-18 | 2009-06-03 | 张延民 | Dual-vertical-shaft mutual-compensation windmill |
| CN102251920A (en) * | 2011-06-20 | 2011-11-23 | 廖宝书 | Rudder direction changing impeller machine |
| CN203248312U (en) * | 2013-04-16 | 2013-10-23 | 郭忠礼 | Wind power collecting device for vehicles |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114162337A (en) * | 2021-11-27 | 2022-03-11 | 西北工业大学 | Windshield system for reducing oil-spraying lubrication wind resistance loss of high-speed spiral bevel gear |
| CN114162337B (en) * | 2021-11-27 | 2024-01-26 | 西北工业大学 | Windshield system for reducing oil injection lubrication windage loss of high-speed spiral bevel gear |
| CN114576188A (en) * | 2022-02-23 | 2022-06-03 | 浙江尔格科技股份有限公司 | Fan capable of automatically adjusting wind direction for heat exchanger |
| CN114576188B (en) * | 2022-02-23 | 2023-04-25 | 浙江尔格科技股份有限公司 | Fan capable of automatically adjusting wind direction for heat exchanger |
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Application publication date: 20150325 |