CN109113931B - New energy solar energy and wind energy combined power generation device and power generation system thereof - Google Patents
New energy solar energy and wind energy combined power generation device and power generation system thereof Download PDFInfo
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- CN109113931B CN109113931B CN201810873575.2A CN201810873575A CN109113931B CN 109113931 B CN109113931 B CN 109113931B CN 201810873575 A CN201810873575 A CN 201810873575A CN 109113931 B CN109113931 B CN 109113931B
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- 238000010248 power generation Methods 0.000 title claims abstract description 97
- 230000007246 mechanism Effects 0.000 claims abstract description 49
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 241001541997 Allionia Species 0.000 description 1
- 241000422846 Sequoiadendron giganteum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
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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
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/02—Wind motors with rotation axis substantially parallel to the air flow entering the rotor having a plurality of rotors
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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
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor having stationary wind-guiding means, e.g. with shrouds or channels
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/007—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations the wind motor being combined with means for converting solar radiation into useful energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
- H02S10/12—Hybrid wind-PV energy systems
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- 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
- Y02E10/50—Photovoltaic [PV] energy
-
- 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
- Y02E10/72—Wind turbines with rotation axis in 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)
- Power Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a new energy solar energy and wind energy combined power generation device, wherein a base is provided with a fixed frame, and the top of the fixed frame is provided with a combined power generation mechanism which can reduce wind resistance and effectively utilize solar energy; the combined power generation device comprises a power generation air cylinder, wherein the power generation air cylinder is transversely arranged at the top of a fixing frame, a wind power generation mechanism is arranged in the power generation air cylinder, a fixing support is fixedly arranged at the front end of the power generation air cylinder, and fixing plates are hinged to the upper end and the lower end of the fixing support respectively.
Description
Technical Field
The invention relates to the technical field of new energy wind power generation equipment, in particular to a new energy solar and wind combined power generation device and a power generation system thereof.
Background
Wind power generation converts kinetic energy of wind into electric energy. Wind energy is more and more valued by countries in the world as a clean renewable energy source; the wind power resource has huge amount, which is 10 times larger than the total amount of water energy which can be developed and utilized on the earth. Wind has long been used by people-mainly to draw water, grind surfaces, etc. by windmills, and nowadays, people are interested in how to use wind to generate electricity.
Wind is one of pollution-free energy sources. Moreover, it is inexhaustible. For coastal islands, grassland pasturing areas, mountain areas and plateau areas with water shortage, fuel shortage and inconvenient traffic, wind power is utilized to generate electricity according to local conditions, and the method is very suitable and optional; wind is a new energy with great potential, and in the beginning of the eighteenth century, one fierce and strong wind in two countries of English law is swept transversely, so that four hundred wind mills, eight hundred houses, one hundred churches and more than four hundred sailing boats are destroyed, thousands of people are injured, and twenty-fifty thousand big trees are uprooted. In the mere fact of drawing trees, the wind generates ten million horsepower (i.e., 750 ten thousand kilowatts; one horsepower equals 0.75 kilowatts) of power in a few seconds! It is estimated that the wind resources available on earth to generate electricity are about 100 hundred million kilowatts, which is almost 10 times the amount of hydroelectric power generated worldwide. At present, the energy obtained by burning coal every year all over the world is only one third of the energy provided by wind power in one year. Therefore, great importance is attached to the utilization of wind power to generate electricity at home and abroad, and new energy is developed.
In addition, in places with rich wind energy, solar energy is also rich generally, however, the traditional wind power generation equipment has stiff structure and single function, particularly cannot effectively reduce wind resistance, has poor stability and cannot effectively utilize solar energy.
Disclosure of Invention
The invention aims to provide a novel solar and wind energy combined power generation device and a power generation system thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a new energy solar energy and wind energy combined power generation device, includes the base, be provided with the mount on the base, the mount top is provided with has the combined power generation mechanism who reduces the windage and effectively utilize solar energy.
As a further scheme of the invention: the combined power generation mechanism comprises a power generation air duct, the power generation air duct is transversely arranged at the top of a fixing frame, a wind power generation mechanism is arranged in the power generation air duct, a fixing support is fixedly arranged at the front end of the power generation air duct, fixing plates are hinged to the upper end and the lower end of the fixing support respectively, a solar cell panel is fixedly arranged on the upper side of each fixing plate, and a driving mechanism for driving the two fixing plates to open and close is arranged on the power generation air duct.
As a still further scheme of the invention: open and shut actuating mechanism and include the horizontal telescopic machanism that electricity generation dryer upside and downside symmetry set up, horizontal telescopic machanism outer end is connected with and pushes away the frame, fixed plate middle part position is through the fixed axle suit in pushing away a frame outer end.
As a still further scheme of the invention: the horizontal telescopic mechanism comprises a machine bin, a transverse screw shaft is sleeved at the front end of the machine bin, the transverse screw shaft is sleeved on a fixed bearing arranged at a position corresponding to the machine bin, a transverse screw shaft driving mechanism is arranged in the machine bin, a screw slider is sleeved on the transverse screw shaft, the screw slider is fixedly connected with a push frame through a connecting rod, and a limiting block is arranged at the outer end of the transverse screw shaft.
As a still further scheme of the invention: the transverse screw shaft driving mechanism comprises a transverse bevel gear, the transverse bevel gear is sleeved at the end part of the transverse screw shaft in the machine bin, a vertical bevel gear and a telescopic motor for driving the vertical bevel gear to rotate are arranged in the machine bin, the transverse bevel gear and the vertical bevel gear are in meshing transmission, and the rear end of the pushing frame is fixedly connected with the machine bin through a limiting telescopic sleeve.
As a still further scheme of the invention: the wind power generation mechanism comprises a first power generation mechanism, the first power generation mechanism comprises a first wind shaft and a first power generator connected with the first wind shaft, the first power generator is fixed at the front end in the power generation wind barrel through a first support, the first wind shaft is sleeved on a first bearing arranged at the middle part of a fixing support in a corresponding position, the outer end of the first wind shaft extends out of the position between two fixing plates at the front end of the power generation wind barrel, a first power generation fan blade is sleeved at the front end of the first wind shaft, and a first flow guide cone is fixedly arranged at the front end of the first wind shaft.
As a still further scheme of the invention: the wind power generation device is characterized by further comprising a second power generation mechanism, the second power generation mechanism comprises a second power generator, the second power generator is fixed at the rear end in the power generation air duct through a second support, a second air shaft is arranged at the front end of the second power generator, second power generation blades are sleeved at the front end of the second air shaft, a second flow guide cone is arranged at the front end of the second air shaft, and a wind collecting hopper is arranged in the power generation air duct at the rear end of the first power generator.
As a still further scheme of the invention: the horizontal telescopic mechanism is replaced by an air cylinder.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a new energy solar energy and wind energy combined power generation device, which is ingenious in structural arrangement and reasonable in arrangement, is provided with multistage wind power generation to fully utilize wind resources, and meanwhile, a solar cell panel on the upper side of a fixing plate performs solar power generation to effectively utilize the solar resources.
Drawings
FIG. 1 is a schematic structural diagram of a new energy solar and wind energy combined power generation device.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
FIG. 3 is a schematic structural diagram of the interior of a machine cabin in the new energy solar and wind energy combined power generation device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1 to 3, in an embodiment of the present invention, a new energy solar and wind energy combined power generation apparatus includes a base 1, a fixing frame 2 is disposed on the base 1, and a combined power generation mechanism having a function of reducing wind resistance and effectively utilizing solar energy is disposed at the top of the fixing frame 2.
The combined power generation mechanism comprises a power generation air duct 3, wherein the power generation air duct 3 is transversely arranged at the top of the fixing frame 2, a wind power generation mechanism is arranged in the power generation air duct 3, a fixing support 19 is fixedly arranged at the front end of the power generation air duct 3, the upper end and the lower end of the fixing support are respectively hinged with a fixing plate 13, a solar cell panel 12 is fixedly arranged on the upper side of each fixing plate 13, and a driving mechanism for driving the two fixing plates to open and close is arranged on the power generation air duct 3.
Open and shut actuating mechanism and include the horizontal telescopic machanism that 3 upsides of electricity generation dryer and downside symmetry set up, horizontal telescopic machanism outer end is connected with and pushes away frame 11, fixed plate 13 middle part position is through the 14 suit of fixed axle in the frame 11 outer end that pushes away.
The horizontal telescopic mechanism comprises a machine bin 10, a transverse screw shaft 26 is sleeved at the front end of the machine bin 10, the transverse screw shaft 26 is sleeved on a fixed bearing 27 arranged at a position corresponding to the machine bin 10, a transverse screw shaft driving mechanism is arranged in the machine bin 10, a screw slider 24 is sleeved on the transverse screw shaft 26, the screw slider 24 is fixedly connected with a push frame 11 through a connecting rod 23, and a limiting block 25 is arranged at the outer end of the transverse screw shaft 26.
The transverse screw shaft driving mechanism comprises a transverse bevel gear 28, the transverse bevel gear 28 is sleeved at the end part of a transverse screw shaft 26 in the machine bin 10, a vertical bevel gear 29 and a telescopic motor 30 for driving the vertical bevel gear 29 to rotate are arranged in the machine bin 10, the transverse bevel gear 28 and the vertical bevel gear 29 are in meshing transmission, and the rear end of the push frame 11 is fixedly connected with the machine bin 10 through a limiting telescopic sleeve 22.
Wind power generation mechanism includes first power generation mechanism, first power generation mechanism includes first wind shaft 17 and the first generator 20 of being connected with first wind shaft 17, and first generator 20 is fixed at the front end in electricity generation dryer 3 through first support 21, first wind shaft 17 suit is on the first bearing 18 that the corresponding position in 19 middle parts of fixed bolster set up, and first wind shaft 17 outer end stretches out between the two fixed plates 13 of electricity generation dryer 3 front end, and first wind shaft 17 front end cover is equipped with first electricity generation fan blade 16, first wind shaft 17 front end is fixed and is provided with first water conservancy diversion awl 15.
The wind power generation device is characterized by further comprising a second power generation mechanism, wherein the second power generation mechanism comprises a second power generator 4, the second power generator 4 is fixed at the inner rear end of the power generation air duct 3 through a second support 5, a second air shaft 6 is arranged at the front end of the second power generator 4, a second power generation fan blade 7 is sleeved at the front end of the second air shaft 6, a second flow guide cone 8 is arranged at the front end of the second air shaft 6, and a wind collecting hopper 9 is arranged in the power generation air duct 9 at the rear end of the first power generator 20.
Example 2: the only technical features of the present embodiment are as follows: the horizontal telescopic mechanism is replaced by an air cylinder.
The working principle of the invention is as follows: the invention provides a new energy solar energy and wind energy combined power generation device, which is ingenious in structural arrangement and reasonable in arrangement, and when the device works, the device is guided by an upper fixing plate and a lower fixing plate to enter the front end of a power generation air cylinder to drive a first power generation fan blade in a first power generation mechanism to rotate, the first power generation fan blade rotates a first wind shaft to drive a first generator to work and generate power, wind passing through the first power generation fan blade enters a wind collecting hopper in the power generation air cylinder to be collected and then blown to a second power generation fan blade, the second power generation fan blade drives a second wind shaft to rotate, the second wind shaft drives a second generator to work, wind resources are fully utilized, meanwhile, a solar panel on the upper side of the fixing plate carries out solar power generation, the solar resources are effectively utilized, in addition, the working principle of an opening and closing driving mechanism is that a vertical bevel gear is driven to rotate, the vertical bevel gear is meshed with a transverse, the transverse screw shaft is in meshing transmission with the screw rod sliding block to drive the screw rod sliding block to move left and right, the lifting sliding block drives the pushing frame to move left and right to further push the two fixing plates to open and close, when wind power is large, the two fixing plates of the opening and closing driving mechanism close to the middle to reduce wind resistance, structural stability is improved, when the wind power is small, the opening and closing mechanism drives the two fixing plates to open, wind power receiving area is increased, more wind power resources are guided into the power generation air duct, and the wind power resources are effectively utilized.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A new energy solar energy and wind energy combined power generation device comprises a base and is characterized in that a fixing frame is arranged on the base, a combined power generation mechanism capable of reducing wind resistance and effectively utilizing solar energy is arranged at the top of the fixing frame, the combined power generation mechanism comprises a power generation air duct, the power generation air duct is transversely arranged at the top of the fixing frame, a wind power generation mechanism is arranged in the power generation air duct, a fixing support is fixedly arranged at the front end of the power generation air duct, fixing plates are respectively hinged to the upper end and the lower end of the fixing support, a solar cell panel is fixedly arranged on the upper side of each fixing plate, an opening and closing driving mechanism for driving the two fixing plates to open and close is arranged on the power generation air duct, each opening and closing driving mechanism comprises horizontal telescopic mechanisms symmetrically arranged on the upper side and the lower side of the power generation air duct, the outer ends of the horizontal, the horizontal telescopic mechanism comprises a machine cabin, a transverse screw shaft is sleeved at the front end of the machine cabin, the transverse screw shaft is sleeved on a fixed bearing arranged at a corresponding position of the machine cabin, a transverse screw shaft driving mechanism is arranged in the machine cabin, a screw rod sliding block is sleeved on the transverse screw shaft, the screw rod sliding block is fixedly connected with a push frame through a connecting rod, a limiting block is arranged at the outer end of the transverse screw shaft, the wind power generation mechanism comprises a first power generation mechanism, the first power generation mechanism comprises a first wind shaft and a first power generator connected with the first wind shaft, the first power generator is fixed at the front end in a power generation wind cylinder through a first support, the first wind shaft is sleeved on a first bearing arranged at a corresponding position in the middle of the fixed support, the outer end of the first wind shaft extends out of the position between two fixed plates at the front end of the power generation wind cylinder, a first power generation fan blade is sleeved at the front end of the first wind shaft, a first guide cone is fixedly, the wind power generation device is characterized by further comprising a second power generation mechanism, the second power generation mechanism comprises a second power generator, the second power generator is fixed at the rear end in the power generation air duct through a second support, a second air shaft is arranged at the front end of the second power generator, second power generation blades are sleeved at the front end of the second air shaft, a second flow guide cone is arranged at the front end of the second air shaft, a wind collecting hopper is arranged in the power generation air duct at the rear end of the first power generator, the transverse screw shaft driving mechanism comprises a transverse bevel gear, the transverse bevel gear is sleeved at the end part of the transverse screw shaft in the machine cabin, a vertical bevel gear and a telescopic motor for driving the vertical bevel gear to rotate are arranged in the machine cabin, the transverse bevel gear is in meshing transmission with the vertical bevel gear, and the rear end of the push frame is fixedly.
2. The new energy solar and wind powered combination power plant of claim 1, wherein the horizontal telescoping mechanism is replaced with a cylinder.
3. A power generation system comprising the new energy solar and wind combined power plant of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810873575.2A CN109113931B (en) | 2018-08-02 | 2018-08-02 | New energy solar energy and wind energy combined power generation device and power generation system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810873575.2A CN109113931B (en) | 2018-08-02 | 2018-08-02 | New energy solar energy and wind energy combined power generation device and power generation system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109113931A CN109113931A (en) | 2019-01-01 |
| CN109113931B true CN109113931B (en) | 2020-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810873575.2A Active CN109113931B (en) | 2018-08-02 | 2018-08-02 | New energy solar energy and wind energy combined power generation device and power generation system thereof |
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| CN (1) | CN109113931B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807876A (en) * | 2005-08-01 | 2006-07-26 | 戚永维 | Wind-driven machine |
| CN201090372Y (en) * | 2007-07-25 | 2008-07-23 | 高建华 | Multilevel wind motor |
| KR20110049020A (en) * | 2009-11-04 | 2011-05-12 | (주)청파이엠티 | Training device for educating the renewable energy |
| CN201810481U (en) * | 2010-04-22 | 2011-04-27 | 李焕昌 | Wind jet and solar energy comprehensive generating set |
| CN102518563B (en) * | 2011-12-23 | 2014-01-15 | 浙江大学 | Power generating set |
| CN104405558B (en) * | 2014-12-01 | 2017-07-07 | 国家电网公司 | A kind of bulb type generator set current speeder |
| CN108063579A (en) * | 2017-12-26 | 2018-05-22 | 郑州天舜电子技术有限公司 | A kind of small-sized hybrid power plant of wind light mutual complementing formula domestic energy-saving |
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2018
- 2018-08-02 CN CN201810873575.2A patent/CN109113931B/en active Active
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| CN109113931A (en) | 2019-01-01 |
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Effective date of registration: 20200629 Address after: No.1 standard workshop, Laibin hi tech Industrial Development Zone, no.419 Shengtang Road, Laibin City, Guangxi Zhuang Autonomous Region Applicant after: Guangxi dongke Shichuang Optoelectronic Technology Co., Ltd Address before: 518000 5013, 5th floor, Taoyuan complex building (827 building), Sungang street, Luohu District, Shenzhen City, Guangdong Province:Shenzhen Yinzhong business secretary Co.,Ltd. ) 518000 Guangdong Shenzhen Luohu District Sungang road Baoan North Road Taoyuan complex building (827 buildings) five building 5013 (enter: Shenzhen silver bell business secretary Co., Ltd.) Applicant before: SHENZHEN FURUIXI TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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