CN106089438A - A kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof - Google Patents
A kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof Download PDFInfo
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- CN106089438A CN106089438A CN201610430150.5A CN201610430150A CN106089438A CN 106089438 A CN106089438 A CN 106089438A CN 201610430150 A CN201610430150 A CN 201610430150A CN 106089438 A CN106089438 A CN 106089438A
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- temperature
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present invention provides a kind of miniaturization temperature difference electricity generation device for the particularly unmanned vehicle engine waste heat recovery of aviation put-put and energy reclaiming method thereof: whole device is attached to engine shell surface by conformal structure heat conductive silica gel；High temperature is reached PN junction temperature end through internal Heat Conduction Material by high temperature heat source；PN junction is double-decker, and its low-temperature end has fin to dispel the heat through air-cooled guide, makes PN upper and lower side form the temperature difference and generates electricity；There are phase-change material and temperature sensing control module in heat conducting module, phase-change material can be used according to variations in temperature in good time to carry out heat release of absorbing heat, PN junction is formed overload protection, and reaches the effect of energy supply, improve the stability of generating, persistency；The electric energy that its thermal gradient energy amount produces is modulated mu balanced circuit, charging circuit, it is stored in ultracapacitor, according to detection control circuit, aircraft inner sensor and other electronic equipment can be powered, the energy of aircraft engine be carried out recycling, improves flying power.
Description
Technical field
The invention belongs to field of renewable energy technology, the tepor reclaimed particularly to a kind of baby plane engine exhaust heat
Differ from TRT and be applied to the method that baby plane electromotor carries out energy regenerating utilization.
Background technology
Along with quickening and the raising of human life quality, baby plane and the unmanned plane of globalization process are widely used,
Its low cost, efficiency-cost ratio is good, risk that no one was injured, and survival ability is strong, and mobility is good, and feature easy to use, in the modern times
War has extremely important effect, more holds out broad prospects at civil area.Owing to current baby plane and unmanned plane are adopted
Aero-engine be generally turbojet or turbofan or for piston-mode motor, delivery efficiency is the lowest, significant portion
The energy of fuel combustion release, all passes through engine body and dissipates consumption with heat energy, as a highly energy-consuming, the equipment of high heat production, quilt
A large amount of uses, will certainly make the waste heat used heat substantial increase emitted, and ambient pressure also will become much larger.If to this part heat
Can reclaim, utilize it to generate electricity, the electric energy of generation is available to sensing or the control system of unmanned plane, again due to existing
Low for sensor energy consumption, energy produced by thermo-electric generation can be greatly improved the flying power of unmanned plane, decreases sensor
Supply module and circuit, enhance unmanned plane overall work ability, be possible not only to produce huge economic benefit, and permissible
Reduce environmental pollution, finally realize the purpose promoted the well-being of mankind.
Thermo-electric generation is the mode that a kind of heat energy is converted into electric energy, and it can make full use of waste heat used heat, is a kind of green
The generation technology that colour circle is protected.At present, the patent of the existing temperature difference electricity generation device relating to waste heat recovery and document, relate generally to vapour
Car engine, aero-engine, the heat recovery and utilization in the field such as vehicle exhaust is (more than CN201410359083.3 diesel engine high temperature
Heat recovery system；CN201010130009.6 mono-kind liquefied natural gas automobile cold energy recovery system based on thermo-electric generation；
CN103078560A semiconductor temperature difference power generating system；CN104279078 vehicle exhaust thermo-electric generation system；
CN105226996A unmanned plane heat reclaiming system).Existing patent is primarily directed to ground installation electromotor and common boat
Empty electromotor, whirlpool spray flight this kind of with fanjet and the piston-mode motor speed for using on baby plane or unmanned plane
, the most easily there is the problem such as peak value of temperature, not yet have phase in the features such as degree is fast, and caloric value is big, and electrothermal calefactive rate is fast
Closing the feasible program of patent, this patent adds accurate temperature sensing control module, use phase-change material as energy-accumulating medium,
Can effectively prevent the temperature peak damage to PN junction；The existing energy recycle device about unmanned plane mainly uses tradition
Accumulator carry out electric power storage, this patent have employed have that power density is high, the charging interval is short, length in service life, good temp characteristic,
The ultracapacitor of the feature such as the energy and environmental protection of saving, substantially increases the performance of electrical storage device.Additionally, thermo-electric generation dress
The miniaturization put also is necessary, especially for there being the unmanned plane of strict demand to weight, the alleviating of construction weight, ensures
Miniature avionic device is powered, and can mean that the raising again of flying power.At present, there are no to whirlpool spray (turbofan) aviation send out
The miniaturization temperature difference electricity generation device of the waste heat recovery that motivation and piston-mode motor are all suitable for, and utilize high-efficiency heat conduction module and phase
The mode becoming material combination improves generator life and the system of power generation stability and the method for energy regenerating utilization.
Summary of the invention:
It is an object of the invention to the heat that can effectively utilize baby plane engine surface to carry, send out through this temperature difference
Electric installation is converted to electric energy heat energy, stores electric energy, in aircraft and the electronic unit such as sensor of electromotor periphery provides energy
Amount, carries high-octane recovery utilization rate, it is achieved energy-conservation purpose.
Device is integrally attached to electromotor outer surface by the heat-resisting heat conductive silica gel conformal with engine surface by the present invention,
Heat-resisting conformal silica gel can change conformal structure according to engine surface different structure shape so that it is is fitted in electromotor table completely
Stably fixing effect is also played in face, and utilizes the internal heat conducting module of polyurethane insulation coating parcel, such that it is able to well will send out
The high-temperature temperature on motivation surface is transferred to PN junction temperature end, improves the transmission effect of heat, and can well realize insulation effect
Really.
Inside heat conducting module in the present invention is aluminium alloy Heat Conduction Material, under engine stabilizer working condition, and electromotor
High temperature energy can be transferred to PN junction temperature end through aluminium alloy Heat Conduction Material, and Heat Conduction Material and PN junction temperature end have thermal grease conduction, with fall
Low thermal contact resistance, PN junction low-temperature end is through heat-dissipating aluminium plate wind-cooling heat dissipating, so that PN junction two ends form the stable temperature difference, carries out steadily
Generating.
There are two cylindrical cavities in inside heat conducting module in the present invention, inside have temperature sensor to detect temperature, additionally
It is evenly distributed cylindrical hole in internal heat conducting module, inside has phase-change material and phase-change material working controller, work as aircraft
Take off, decline or engine load fluctuation excessive during, high temperature fluctuation in the case of, engine surface temperature raise,
Temperature sensor detects limiting temperature, and now phase-change material can be as heat storage units, and phase-change material working controller is by phase transformation
Material moves down, and is labelled to heat conductive silica gel surface and carries out decalescence, absorbs additional energy, and be possible to prevent thermal overload, damage
PN junction, when temperature sensor detects that temperature is reduced to uniform temperature condition, phase-change material working controller is by phase-change material
On move to internal heat conducting module surface and carry out heat release, PN junction hot junction is provided extra energy, thus power-assisted generating, phase-change material
Controlled its work by temperature detecting module through phase-change material control module, through the controlled chemical industry work of phase-change material, heat conduction can be made
In module, temperature tends to be steady, and temperature fluctuation is little, and the generating of the working life and thermoelectric generator that improve PN junction electricity generation module is put down
Stability.
Quasiconductor PN joint low-temperature end in the present invention is kept stable cooling by aluminum heat sink, its low-temperature end fin
The type of cooling is air cooling way, and its air-cooled air-flow comes from the air-flow that aircraft high-speed flight produces, through TRT circumferential flux line style
Flow of cooled air is flowed through fin and dispels the heat by trousers 17 and air flue 18, when high-speed air flow flows through trousers, front end by
Acting in inclination angle, cold air enters from three air inlets, and trousers upper end is passed through due to high velocity air, causes inside and outside trousers
Pressure differential, forces the hot-air square opening from upper end to flow out, and part hot-air flows out from rear end square opening simultaneously, and fin is sheet
Shape structure, each heatsink upper surface edge layout presents arc-shaped, can realize conformal laminating with the laminating of streamlined trousers,
There are zigzag slot, increasing heat radiation area on each fin, it is achieved preferably radiating effect, and do not affect the suitable of inner air
Channel Group is moved.
The structure of the semiconductor PN in the present invention is double-decker, can be in the case of temperature span is big, more fully
The temperature difference is converted into electric energy, it is adaptable to the engine surface that aero-engine low temperature environment during high-altitude flight is caused
The situation poor with high ambient temperature, the structure of every layer of PN junction is that multiple electrothermal module is in series, and can improve output and electricity
Pressure.The electric energy that temperature difference electricity generation device produces is modulated mu balanced circuit, charging circuit by electrical power storage in ultracapacitor, super
Capacitor can absorb small and weak electric current, and efficiency for charge-discharge is high, and the life-span is long, working stability under the special operation condition of flight.
The electric energy being stored in ultracapacitor control circuit 14 after testing, power supply circuits 15 pass for airborne different parts 16
Sensor and other electronic equipment is powered and power switching.
The medicine have the advantages that and achieve baby plane and the one-tenth material gain of unmanned vehicle engine surface high-temp heat energy
With, heat energy is converted to electric energy, provides energy for airborne electronic unit, carry high-octane secondary utilization rate and aircraft continuation of the journey energy
Power, can successfully be realized the miniaturization of thermoelectric generator, improve by heat absorption conformal structure, air-cooled guide and heat abstractor
Pyroelectric effect, and pass through temperature sensing and control and utilize phase-change material heat absorption heat release, thermoelectric generator can be improved to temperature
The adaptability of degree change, protects PN junction structure, improves functional reliability and the life-span of equipment, and simple in construction, beneficially miniaturization,
Production cost is low, and capacity efficiency is high.
Accompanying drawing illustrates:
Fig. 1 is a kind of miniature temperature difference electricity generation device front view；
Fig. 2 is a kind of miniature temperature difference electricity generation device left view；
Fig. 3 is a kind of miniature temperature difference electricity generation device top view；
Fig. 4 is the internal heat conducting module front view of a kind of miniature temperature difference electricity generation device；
Fig. 5 is the internal heat conducting module plan view of a kind of miniature temperature difference electricity generation device；
Fig. 6 is the system knot of a kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof
Composition；
Fig. 7 is that the air cooling of a kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof is whole
Stream cover top view；
Fig. 8 is that the air cooling of a kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof is whole
Stream cover left view；
Fig. 9 is that the air cooling of a kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof is whole
Stream cover front view.
Detailed description of the invention:
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of miniaturization temperature difference electricity generation device for aero-engine waste heat recovery, it by
The heat conductive silica gel 1 conformal with engine surface, is integrally attached to aero-engine outer surface by device；Internal heat conducting module 3 pastes
Being combined in above heat conductive silica gel 1, polyurethane insulation coating 2 carries out insulation outside being wrapped in；Internal heat conducting module 3 is aluminium alloy heat conduction
Material, has two cylindrical cavities with position, heat conductive silica gel 1 joint bottom it, inside has temperature sensor for detecting work temperature
Degree, it addition, be evenly distributed cylindrical hole in internal heat conducting module, inside has phase-change material and phase-change material job control
Device；The upper surface laminating of internal heat conducting module 3 is covered with PN junction generator unit 4, and the structure of semiconductor PN is double-decker, every layer
The structure of PN junction is that multiple electrothermal module is in series；Structure 4 upper surface of PN junction is provided with fin 5, for laminated structure, respectively
Individual heatsink upper surface edge layout presents arc-shaped, can realize conformal laminating, each heat radiation with streamlined dome structure
Zigzag slot, increasing heat radiation area is had, it is achieved preferably radiating effect on sheet.
As shown in Figure 4, Figure 5, the inside heat conducting module in the present invention is aluminium alloy Heat Conduction Material, works at engine stabilizer
In the case of, engine surface temperature fluctuation is little, and engine high-temperature energy can transmit through heat conductive silica gel 1, aluminium alloy Heat Conduction Material 3
To PN junction temperature end, make temperature end mask have high temperature, have thermal grease conduction between PN junction temperature end and heat-conduction aluminum alloy material for reducing
Thermal contact resistance；PN junction low-temperature end connects heat-dissipating aluminium plate 5, dispels the heat through air cooling equipment, and its air-cooled air-flow comes from high-altitude flight and produces
Raw high velocity air, flows through fin by flow of cooled air dissipate through TRT circumferential flux line style trousers 17 and air flue 18
Heat, can improve radiating efficiency, promotes pyroelectric effect, so that PN junction low-temperature zone has low temperature, causes two ends to be formed stable
The temperature difference, thus steadily generate electricity, now phase-change material 7 is in off working state.
As shown in Figure 4, Figure 5, the inside heat conducting module in the present invention built with temperature sensor 9 can carry out temperature prison
Survey, during taking off or declining, in the case of the fluctuation of engine surface high temperature, when engine surface temperature liter
Height, temperature sensor detects limiting temperature, and now, the phase-change material 7 in inner homogeneous through hole 6 will be through phase-change material control
Parts 8 control to be operated, and phase-change material moves down, and moves to the surface of heat conductive silica gel, carry out decalescence, absorb extra
Energy, it is standby that phase-change material now can store heat as heat storage units, and is possible to prevent thermal overload, the PN on damage top
Knot.
When temperature sensor 9 detects that temperature is reduced to uniform temperature condition, phase-change material working controller 8 is by phase transformation
Move to internal heat conducting module surface on material 7 fit therewith and carry out heat release, thus PN junction can be provided extra energy, power-assisted
Generating；When phase change material releases heat terminates, when thermoelectric generator is in smooth working state, phase-change material just returns to original place, stops
Work.Phase-change material is controlled its work by temperature detecting module through phase-change material control module, through controlledization of phase-change material
Work, in can making heat conducting module, temperature tends to be steady, and temperature fluctuation is little, and the working life and the temperature difference that improve PN junction electricity generation module are sent out
The generating stationarity of electrical equipment.
The aero-engine of present invention application is higher due to surface temperature, so using high temperature phase change material (pcm), the most merely
Salt phase transition temperature high, also can mix multiple salt to adjust phase transition temperature, be mixed into metal dust wherein and can improve heat
Conductance, is commonly used for the high-temperature residual heat of recovery plant, and the hot-side temperature of this temperature difference electricity generation device is about 200 more spends, and considers,
Selecting phase transition temperature is 252 degrees Celsius, and latent heat of phase change is the LiNO of 370KJ/Kg3Phase transformation packing material as this device.
The structure of the semiconductor PN in the present invention is two-layer composite, and the structure of every layer of PN junction is multiple electrothermal module
Being in series, such multiple structure can be converted into electric energy the temperature difference in the case of temperature span is big more fully, it is adaptable to
The situation of aero-engine high temperature of outer surface of high difference, can well improve output and voltage, and temperature difference electricity generation device produces
Electrical power storage is in ultracapacitor, and the parts such as sensor for electromotor periphery provide continued power, thus carry high-octane
Recovery utilization rate, the electric energy that temperature difference electricity generation device produces is modulated mu balanced circuit, charging circuit by electrical power storage in super capacitor
Working stability, the electric energy being stored in ultracapacitor control circuit 14 after testing, power supply under the special operation condition of flight in device
Circuit 15 is powered and power switching for airborne different parts 16.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Any amendment, equivalent and the improvement etc. made within principle, should be included in protection scope of the present invention.
Claims (6)
1. miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof, it is by heat conductive silica gel
(1), polyurethane insulation coating (2), internal heat conducting module (3), PN junction (4), fin (5), phase-change material working area (6), phase transformation
Material (7), phase-change material control parts (8), temperature sensor (9), temperature sensor working area (10), streamlined trousers
(17) combining, the electric energy that temperature-difference power generation module produces is modulated mu balanced circuit (11), charging circuit (12) by electrical power storage
In ultracapacitor (13), control circuit (14), power supply circuits (15) are that airborne different parts (16) are powered after testing
And power switching.
A kind of miniature temperature difference electricity generation device the most according to claim 1 and the application on put-put energy regenerating thereof
Method, is characterized in that fin (5) is laminated structure, and each heatsink upper surface edge layout presents arc-shaped, with streamlined
Trousers is fitted, and each fin has zigzag slot, and the type of cooling of its low-temperature end fin is air cooling way, its air-cooled gas
Stream comes from the high velocity air that high-altitude flight produces, and flow of cooled air flows through TRT circumferential flux line style trousers (17), rectification
Cover front end is the streamlined of 30 degree of inclination angles, and tilting position opens three air inlets, enters for cold air, and two sides are opened on trousers top
Shape hole, rear end is opened a square opening, is flowed out for hot-air, dispel the heat fin.
A kind of miniature temperature difference electricity generation device the most according to claim 1 and the application on put-put energy regenerating thereof
Method, is characterized in that internal heat conducting module (3) version, polyurethane insulation coating (2) wraps up insulation, Heat Conduction Material is
Aluminium alloy plate, inside having cylindrical hole is phase-change material working area (6), and phase-change material (7), phase-change material control parts (8) peace
Being mounted in it heart position, separately having two cylindrical cavities is temperature sensor working area (10), wherein equipped with temperature sensor
(9), the height of temperature sensor detection temperature, control parts (8) through phase-change material in good time and control phase-change material (7) work, will
It is shifted to (1) or face, PN junction hot junction at heat conductive silica gel and carries out neither endothermic nor exothermic.
A kind of miniature temperature difference electricity generation device the most according to claim 1 and the application on put-put energy regenerating thereof
Method, is characterized in that when electromotor smooth working, only by internal heat conducting module (3), high temperature is transferred directly to PN junction (4)
Lower surface, carries out stable power generation operation, when taking off, decline and during engine load fluctuation acutely, and electromotor
Temperature rises to assigned temperature, and temperature sensor (9) detects limiting temperature, thus phase-change material controls parts (8) and starts working
Phase-change material (7) is affixed on heat conductive silica gel (1) surface absorb heat, when temperature sensor (9) detects that temperature reduces, phase transformation
Control of material parts (8) control the upper shifting of phase-change material (7), internal heat conducting module (3) surface of contact, dispel the heat, PN junction temperature
During reduction, phase-change material (7) provides heat.
A kind of miniature temperature difference electricity generation device the most according to claim 1 and the application on put-put energy regenerating thereof
Method, is characterized in that PN junction (4) is double-deck cascaded structure form, and its temperature end is attached to internal heat conducting module (3) upper surface, low temperature
End is connected with fin (5).
A kind of miniature temperature difference electricity generation device the most according to claim 1 and the application on put-put energy regenerating thereof
Method, is characterized in that thermostable heat-conductive silica gel (1) is conformal structure, temperature difference electricity generation device entirety is attached at put-put table
Face, can change conformal structure according to surface configuration, and play fixation.
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| CN201610430150.5A CN106089438A (en) | 2016-06-16 | 2016-06-16 | A kind of miniature temperature difference electricity generation device and the application process on put-put energy regenerating thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107253528A (en) * | 2017-06-21 | 2017-10-17 | 深圳市雷凌广通技术研发有限公司 | A kind of unmanned plane with function of energy reclaiming |
| CN107503647A (en) * | 2017-10-24 | 2017-12-22 | 浙江解放装饰工程有限公司 | A kind of heat-insulating bridge-cut-off aluminum alloy doors and windows |
| CN108131405A (en) * | 2017-12-22 | 2018-06-08 | 西安科技大学 | A kind of energy regenerating wet multi-disc brake |
| CN109039158A (en) * | 2018-09-04 | 2018-12-18 | 长沙理工大学 | A kind of hydro pneumatic suspension temperature control and energy regenerating integrated system |
| US10189554B1 (en) | 2017-07-10 | 2019-01-29 | Qualcomm Incorporated | Enclosure cooling for thermal management of unmanned aerial vehicles |
| CN109441638A (en) * | 2018-11-12 | 2019-03-08 | 陈铭通 | Aeroengine Altitude Test-bench energy absorption and conversion equipment |
| CN109525026A (en) * | 2019-01-15 | 2019-03-26 | 北京智慧蓝天科技有限公司 | A kind of pneumatic hot mixing power generator of motor-driven vehicle and automotive emission system |
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| CN113555492A (en) * | 2021-09-16 | 2021-10-26 | 中国电子科技集团公司信息科学研究院 | Electronic waste heat collecting device and control method thereof |
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