CN110053561B - Energy-conserving rear-view mirror cover of drag reduction - Google Patents
Energy-conserving rear-view mirror cover of drag reduction Download PDFInfo
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- CN110053561B CN110053561B CN201910349971.XA CN201910349971A CN110053561B CN 110053561 B CN110053561 B CN 110053561B CN 201910349971 A CN201910349971 A CN 201910349971A CN 110053561 B CN110053561 B CN 110053561B
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- rearview mirror
- partition plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/06—Rear-view mirror arrangements mounted on vehicle exterior
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
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- 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
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/08—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for recovering energy derived from swinging, rolling, pitching or like movements, e.g. from the vibrations of a machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Multimedia (AREA)
- General Engineering & Computer Science (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
The invention discloses a drag reduction energy-saving rearview mirror cover which comprises a rearview mirror shell (1), a partition plate (2), a piezoelectric material (3) and a base (4); the rearview mirror shell (1) is arranged on the vehicle body through a base (4); the partition plate (2) is arranged on the front end surface of the rearview mirror shell (1); a layer of piezoelectric material (3) is arranged on each of two sides of the partition plate (2); the electric energy generated by the piezoelectric material is led out from an electrode (5) arranged in the base (4), and is transmitted to the energy storage device after passing through the rectifying circuit. According to the invention, the partition plate is arranged at the front end of the rearview mirror, so that the boundary layer disturbance of a rearview mirror flow field is enhanced, the formation of a separation zone at the rear end of the rearview mirror is delayed, and the differential pressure resistance can be effectively reduced; the energy generated by the pressure difference place at the two sides of the partition plate is absorbed by the piezoelectric material attached to the partition plate and the energy recovery device, so that the energy consumption of the automobile can be further reduced.
Description
Technical Field
The invention relates to an automobile rearview mirror cover, in particular to a drag-reduction energy-saving rearview mirror cover.
Background
As an essential component mounted on a vehicle body, an external rear view mirror provides road condition information around the vehicle for a driver, and has a crucial influence on the driving safety of an automobile. The existence of the vortex shedding type air flow field causes the expansion protruding structure to be added on the automobile body, the integrity of the automobile body flow field is damaged, and the boundary layer separation and vortex shedding generated when air flows through the surface of the vortex shedding type air flow field cause the generation of additional shape resistance, noise and vibration. For a common car, the external rearview mirror only occupies a small projection area of the whole car, but the air resistance is increased by 2% -7%, and for a heavy truck, the increased air resistance is more. In view of the fact that the contribution of the outer rearview mirror to air resistance is far larger than the area proportion occupied by the outer rearview mirror in size, finding a proper drag reduction method has important significance for reducing energy consumption of the automobile in the transportation process.
From a hydrodynamic point of view, suppression of vortex shedding and the flow field pulsations that it generates is the primary means of reducing rearview mirror drag and noise. The published patents (CN 104995061 a, CN 106314287 a) adopt a method of sucking air from the front end of the rear view mirror and discharging air from the rear end and discharging air from the side to achieve drag reduction and noise reduction of the rear view mirror. There are also patents that have conducted rearview mirror design from a biomimetic perspective (CN 106379240 a). According to the invention, the partition plate with the piezoelectric material is arranged at the front end of the rearview mirror, so that on one hand, the partition plate is utilized to block the interaction of the karman vortex streets on the two sides of the downstream, and further the formation of wake vortexes is inhibited, on the other hand, the piezoelectric material is utilized to absorb the vibration energy of high-speed airflow, and the noise generated by turbulent pulsation can be further reduced, thereby achieving the effects of reducing drag and noise.
Disclosure of Invention
The invention aims to provide a rearview mirror design with functions of reducing resistance and noise and recovering energy; on one hand, the splitter plate arranged at the front end of the rearview mirror is utilized to promote the disturbance of the boundary layer of the flow field of the rearview mirror and delay the formation of the tail separation area of the rearview mirror, thereby achieving the purpose of reducing the air resistance. And on the other hand, a vibration energy recovery device is arranged on the partition plate to absorb the vibration energy of the high-speed airflow and realize energy recovery.
A drag reduction energy-saving rearview mirror cover comprises a rearview mirror shell partition plate, a piezoelectric material and a base; the rearview mirror shell is arranged on the vehicle body through the base; the partition plate is arranged on the front end surface of the rearview mirror shell; a layer of piezoelectric material is arranged on each of two sides of the partition plate; the electric energy generated by the piezoelectric material is led out from the electrode arranged in the base, and is transmitted to the energy storage device after passing through the rectifying circuit. When a vehicle runs, unstable flow fields can be formed on the left side and the right side of the partition plate, pressure difference and vibration can be generated on the left side and the right side, the piezoelectric material can capture energy generated by the pressure difference, and the obtained energy is transmitted to the energy storage device through the rectifying circuit. In addition, under the effect of vortex structures generated on two sides of the partition plate, the disturbance of a boundary layer of a rearview mirror flow field is enhanced, a small-scale turbulence structure generated by the disturbance can promote the transition of the boundary layer from laminar flow to turbulence, the formation of a rear-end separation area is delayed, the vortex intensity of wake flow is reduced, and the differential pressure resistance and the noise can be effectively reduced.
The number of the partition plates can be one or more, and the number of the partition plates can be set by combining different types of rearview mirrors.
Furthermore, the number of the partition plates is 1, the partition plates are arranged in the center of the rearview mirror shell and are integrally formed with the rearview mirror shell.
Furthermore, the rearview mirror shell is a hollow shell consisting of an outer shell and an inner shell, an air inlet is formed in the outer shell, and partition plates are arranged on two sides of the air inlet. Preferably, a plurality of air outlets can be arranged on the rear end surface of the rearview mirror shell, and air is ejected from the rear end of the rearview mirror by utilizing an air flow channel formed by the inner shell and the outer shell, so that the disturbance on a boundary layer of the rearview mirror is further enhanced;
further, the thickness of the piezoelectric material depends on the number of layers of the PVDF polymer film, and is generally 4-6 layers of the PVDF polymer film.
Furthermore, the piezoelectric material is pasted on the partition board.
Further, when the characteristic width of the rearview mirror is represented by D, the width D of the partition plate is preferably 0.05D, and the length L of the partition plate is less than or equal to 0.6D.
Further, in order to obtain a sufficient piezoelectric action area, the projected height H of the partition plate is slightly higher than the height H of the mirror housing.
Has the advantages that:
(1) according to the invention, the partition plate is arranged at the front end of the rearview mirror, so that the boundary layer disturbance of the rearview mirror flow field is enhanced, the formation of the separation area at the rear end of the rearview mirror is delayed, and the differential pressure resistance can be effectively reduced.
(2) The energy of the pressure difference place at two sides of the partition plate is absorbed by the piezoelectric material attached to the partition plate and the energy recovery device, so that the energy consumption of the automobile can be further reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic front view of the structure of embodiment 1 of the present invention;
FIG. 3 is a schematic rear view of embodiment 1 of the present invention;
FIG. 4 is a schematic view of a rearview mirror flow field of the present invention without the installation of a divider plate;
FIG. 5 is a schematic view of the impact of the splitter plate of example 1 of the present invention on the flow field of the rearview mirror;
FIG. 6 is a schematic front view of the structure of example 2 of the present invention;
FIG. 7 is a schematic side view of the structure of example 2 of the present invention;
fig. 8 is a front view schematically showing the structure of the inner case of the rear view mirror in the embodiment 2 of the present invention;
fig. 9 is a rear view configuration diagram of the mirror inner case in the practical example 2 of the invention;
fig. 10 is a schematic view of the influence of the separator plate on the flow field of the rearview mirror in embodiment 2 of the present invention;
wherein, 1, a rearview mirror shell; 2. a partition plate; 3. a piezoelectric material; 4. a base; 5. an electrode; 6. an air inlet; 7. an air outlet; 8. an energy storage device; 9. a cavity formed by the inner and outer shells.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1-3: a drag reduction energy-saving rearview mirror cover comprises a rearview mirror shell 1, a partition plate 2, a piezoelectric material 3 and a base 4; the rearview mirror shell 1 is arranged on the vehicle body through a base 4; the partition board 2 is arranged on the front end surface of the rearview mirror shell 1; a layer of piezoelectric material 3 is arranged on each of two sides of the partition plate 2; the electric energy generated by the piezoelectric material is led out from the electrode 5 arranged in the base 4, and is transmitted to the energy storage device 8 after passing through the rectifying circuit. The number of the partition plates 2 is 1, and the partition plates are provided at the center of the front end surface of the mirror housing 1 and are integrally formed with the mirror housing 1. When the characteristic width of the mirror is denoted by D, the width D of the divider plate 2 is 0.05D and the length L does not exceed 0.6D. The thickness of the piezoelectric material is 5 layers of PVDF polymer films, and the projection height H of the partition plate is slightly higher than the height H of the rearview mirror cover, wherein H is 1.1H in the example.
It can be seen from fig. 4 that under the action of the vortex structures generated on the two sides of the partition plate, the disturbance of the boundary layer of the flow field of the rearview mirror is enhanced, the small-scale turbulence structure generated by the disturbance can promote the transition of the boundary layer from laminar flow to turbulent flow, postpone the formation of the rear-end separation zone, reduce the vortex intensity of the wake flow, and effectively reduce the pressure difference resistance and the noise. Meanwhile, the energy of a pressure difference place at two sides of the partition plate is absorbed by the piezoelectric material attached to the partition plate and the energy recovery device, so that the energy consumption of the automobile can be further reduced.
Example 2
As shown in fig. 6: a drag reduction energy-saving rearview mirror cover comprises a rearview mirror shell 1, a partition plate 2, a piezoelectric material 3 and a base 4; the rearview mirror shell 1 is arranged on the vehicle body through a base 4; the partition board 2 is arranged on the front end surface of the rearview mirror shell 1; a layer of piezoelectric material 3 is arranged on each of two sides of the partition plate 2; the rearview mirror shell 1 is a hollow shell consisting of an outer shell 1-1 and an inner shell 1-2, a plurality of air outlets 7 are arranged on the rear end surface of the rearview mirror shell 1, an air inlet 6 is arranged on the outer shell 1-1, and partition plates 2 are arranged on two sides of the air inlet 6. The main difference between this embodiment and embodiment 1 is that in this embodiment, high-speed air is introduced from the front end surface, i.e. the windward surface, of the rearview mirror, and air is emitted from the rear end of the rearview mirror by using an air flow channel formed by the inner and outer housings, so that the disturbance to the boundary layer of the rearview mirror is further enhanced. Meanwhile, the division plates are arranged on two sides of the air inlet 6, so that the area of piezoelectric energy recovery is increased, and an airflow channel entering the air inlet is formed. Front and rear views of the mirror housing as shown in fig. 8 and 9, the air flow is guided to the mirror rear face outlet 7 by the cavity 9 formed by the housing to eject air, thereby increasing the disturbance of the flow field.
Fig. 10 is a schematic diagram of the influence of embodiment 2 on the flow field of the rearview mirror, and it can be seen from the diagram that the air emitted from the rear end of the rearview mirror further enhances the disturbance on the boundary layer of the rearview mirror, so as to further reduce the pressure difference resistance, and meanwhile, the area of piezoelectric energy recovery is further increased due to the installation of the partition plates 2 on the two sides of the air inlet 6.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The drag reduction energy-saving rearview mirror cover is characterized by comprising a rearview mirror shell (1), a partition plate (2), a piezoelectric material (3) and a base (4); the rearview mirror shell (1) is arranged on the vehicle body through a base (4); the partition plate (2) is arranged on the front end surface of the rearview mirror shell (1); a layer of piezoelectric material (3) is arranged on each of two sides of the partition plate (2); electric energy generated by the piezoelectric material is led out from an electrode (5) arranged in the base (4), and is transmitted to the energy storage device after passing through the rectifying circuit;
the rearview mirror shell (1) is a hollow shell consisting of an outer shell (1-1) and an inner shell (1-2), an air inlet (6) is formed in the outer shell (1-1), and partition plates (2) are arranged on two sides of the air inlet (6).
2. Drag reducing and energy saving rearview mirror housing as claimed in claim 1, characterized in that a plurality of air outlets (7) are provided on the rear end face of the rearview mirror housing (1).
3. The drag reducing and energy saving rearview mirror housing of claim 1, wherein said piezoelectric material (3) is 4-6 layers of polyvinylidene fluoride (PVDF) polymer film.
4. The drag-reducing and energy-saving rearview mirror housing as claimed in claim 3, wherein the piezoelectric material (3) is adhered to the partition plate (2).
5. The drag reducing and energy saving rearview mirror cover of any one of claims 1-3, wherein when the characteristic width of the rearview mirror is represented by D, the width D of the splitter plate is 0.05D, and the length L of the splitter plate is less than or equal to 0.6D.
6. Drag reducing and energy saving rearview mirror housing as claimed in any one of claims 1-3, wherein the projected height H of the divider panel is slightly higher than the rearview mirror housing height H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910349971.XA CN110053561B (en) | 2019-04-28 | 2019-04-28 | Energy-conserving rear-view mirror cover of drag reduction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910349971.XA CN110053561B (en) | 2019-04-28 | 2019-04-28 | Energy-conserving rear-view mirror cover of drag reduction |
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| Publication Number | Publication Date |
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| CN110053561A CN110053561A (en) | 2019-07-26 |
| CN110053561B true CN110053561B (en) | 2021-05-18 |
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| CN201910349971.XA Active CN110053561B (en) | 2019-04-28 | 2019-04-28 | Energy-conserving rear-view mirror cover of drag reduction |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058695B (en) * | 1979-09-14 | 1983-06-29 | Leyland Vehicles | Vehicle exterior mirror |
| GB2468289A (en) * | 2009-03-03 | 2010-09-08 | Nissan Motor Mfg | Vehicle door mirrors |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0211433A (en) * | 1988-06-28 | 1990-01-16 | Aisin Seiki Co Ltd | Device for removing water drop |
| US5132840A (en) * | 1989-01-12 | 1992-07-21 | Aisin Seiki Kabushiki Kaisha | Cleaning apparatus for automotive rear view mirror |
| JP2765019B2 (en) * | 1989-03-17 | 1998-06-11 | アイシン精機株式会社 | Water drop removal device |
| US5148312A (en) * | 1989-02-09 | 1992-09-15 | Aisin Seiki Kabushiki Kaisha | Cleaning apparatus for removing foreign substances from a surface variously including a curved member, expanding-contracting vibrator means, and spacer means including a through hole or a depressed region |
| CN2628339Y (en) * | 2003-05-28 | 2004-07-28 | 沈江 | Motor vehicle rear viewing mirror with removing rainwater unit |
| EP2301803A1 (en) * | 2009-09-29 | 2011-03-30 | SMR Patents S.à.r.l. | Self substaining rear view mirror |
| US9056584B2 (en) * | 2010-07-08 | 2015-06-16 | Gentex Corporation | Rearview assembly for a vehicle |
| CN105245131B (en) * | 2015-11-17 | 2017-07-11 | 江苏理工学院 | Noise piezoelectric generating device |
| CN109436104A (en) * | 2018-10-26 | 2019-03-08 | 江苏理工学院 | Automobile tail fin |
-
2019
- 2019-04-28 CN CN201910349971.XA patent/CN110053561B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058695B (en) * | 1979-09-14 | 1983-06-29 | Leyland Vehicles | Vehicle exterior mirror |
| GB2468289A (en) * | 2009-03-03 | 2010-09-08 | Nissan Motor Mfg | Vehicle door mirrors |
Non-Patent Citations (1)
| Title |
|---|
| B.T.Kletz.Active Vibration Isolation of Rear-View Mirrors Based on Piezoceramic "Double Spiral" Actuators.《Proceedings of ISMA2012-USD2012》.2012,第305-320页. * |
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