CN104455897A - Three-phase vortex street current sharing method and device - Google Patents
Three-phase vortex street current sharing method and device Download PDFInfo
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- CN104455897A CN104455897A CN201410606424.2A CN201410606424A CN104455897A CN 104455897 A CN104455897 A CN 104455897A CN 201410606424 A CN201410606424 A CN 201410606424A CN 104455897 A CN104455897 A CN 104455897A
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- vortex street
- phase
- phase vortex
- street current
- baffle plate
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/011—Prefiltering; Flow controlling
Abstract
The invention discloses a three-phase vortex street current sharing device which comprises front-end flow guide boards and three-phase vortex street current sharing baffles. The windward faces of the three-phase vortex street current sharing baffles are each of a streamline body structure. The leeward faces of the three-phase vortex street current sharing baffles are each of a bluff body structure. The front-end flow guide boards are connected with the streamline body structure ends of the three-phase vortex street current sharing baffles which can be used for achieving the increased vortex street current sharing effect in a corner or a gradually-expanding pipeline or a suddenly-expanding pipeline. The windward faces of the three-phase vortex street current sharing device are each of the streamline body structure, resistance in the gas, liquid and solid three-phase movement processes is fully reduced, the pressure drop and the energy consumption of a system are reduced, and operation cost is reduced; the leeward faces are each of the bluff body structure, so that when gas, liquid drops and particles flow through bluff bodies, two-way vortex streets are generated behind the bluff bodies, the flow field turbulence behind the current sharing baffles is improved, and the three phases are more evenly mixed through transverse conveyance of the vortex streets.
Description
Technical field
The present invention relates to a kind of three-phase vortex street current equalizing method and device thereof, belong to fluid flow arts field.
Background technique
In industry equipment pipeline, the change of counter the changing of pipeline section and duct orientation can cause fluid motion direction to change, and then the liquid phase causing fluid to carry or solid particle are separated, finally make fluid cross section speed/CONCENTRATION DISTRIBUTION after flowing through racing bend, flaring pipeline or Divergent Piping uneven, affect the working efficiency such as mixing, transmission, reaction of follow-up equipment further.If when fluid flows through entrance sharp turn head section, gradually expanding section or sudden expansion section, use the current equalizer of correct design can greatly avoid these adverse influences, keep the form of air-flow, make airspeed/uniform concentration distribution.
At present, current equalizer in domestic industry equipment pipe take guide plate as main flow, although mounting guiding board can make gas velocity comparatively even, but this boundary layer being close to guide plate under the effect of inertial force and drag force of the particle of solid phase or liquid phase moves more, make solid phase or liquid phase excessive in guide plate near-wall region concentration, regional concentration away from guide plate is too small, the liquid phase finally in each passage or solid-phase CONCENTRATION DISTRIBUTION inequality, thus causes gas-solid-liquid three-phase mixing in pipeline uneven.In the equipment of industrial product, the wearing and tearing of gas-solid-liquid three-phase mixing uneven meeting initiator reactor inner catalyst are uneven, air pollutants is uneven, charging particle is uneven, stressed separation uneven, gas-liquid mass transfer is uneven, drop carries unequal various problems, has a strong impact on device efficiency.As in electrical precipitator, air-flow, when flowing through entrance elbow section and gradually expanding section, can make inlet air flow speed even although install conventional guide plate, subparticle and drop inequality thereof, cause the charged inequality of deduster internal particle, reunion and separating effect not good, finally cause removal efficiency to reduce.Generally speaking, conventional guide plate be with gas velocity evenly for target, do not consider the evenly collaborative of liquid phase or solid-phase and gas phase, develop a kind of gas-solid-liquid three-phase is mixed homogenizing plate and the method for current-sharing synergy be current problem demanding prompt solution.Although some scholars have done many innovative designs on the basis of conventional guide plate, as patent " a kind of streamline guide plate structure " (201310083921.4), streamlined amendment has been carried out to the front end of guide plate, but main purpose is the resistance of the minimizing system for the distribution of commodities and reduces the flow disturbance and the loss of momentum that cause due to the abrupt change of cross-section, does not still solve the problem of three-phase skewness.
Also have relevant research and delta wing technology both at home and abroad for the equal flow problem of three-phase, delta wing technology utilizes delta wing baffle arrangement to make air-flow after baffle plate, produce two-way vortex street, adds the air-flow turbulance after baffle plate thus optimize heterogeneous uniform effect.The air-flow of external German Bark Dole company with regard to starting to utilize delta wing technology to solve in pipeline from 85 years mixes uneven problem (US4498786, US4527903, US5234672, US6615507), in recent years, Babcock Energy Co., Ltd of the U.S. (US8517599) and domestic Guo electricity Long Yuan environmental protection company (200810304121.x) all have employed delta wing technology to ensure SCR entrance stage NH in SCR system
3/ NO
xmix with flue gas, the cardinal principle of technique arranges reducing agent jet pipe at the lee face of delta wing baffle plate, utilizes the whirlpool extension direction at delta wing rear and jet pipe to spray the favorable factors such as the eddy effect of the contrary and delta wing baffle plate lee face in direction and make NH
3/ NO
xmix more even with flue gas.But above technology all has deficiency, first, the windward side that delta wing technology itself utilizes and lee face are bluff body structure, windward side bluff body structure produces larger zone of high pressure in windward side, substantially increase the pressure drag of system, can be described as the current-sharing realized premised on sacrificial system resistance, greatly add the operating cost of system.In addition, what the delta wing current balance function in SCR system was mainly paid close attention to is that outside fluid mixes with the heterogeneous of fluid in pipeline, but, if pipe interior fluid is originally as heterogeneous fluid, by how realizing heterogeneous current-sharing during the effect of outside fluid Forced Mixing do not mention.
In a word, the deficiency of forgo conventional guide plate and delta wing technology, developing and a kind ofly not only pipe interior fluid gas-solid-liquid three-phase can be made to mix but also can reduce synergy current equalizing method and the device thereof of system pressure drag on this basis, is current problem demanding prompt solution.
Summary of the invention
The object of this invention is to provide a kind of three-phase vortex street current equalizing method and device thereof, the windward side of this three-phase vortex street current equalizer is streamline structure, substantially reduce the resistance in gas, liquid, solid three-phase movement process, thus reduce pressure drop and the energy consumption of system, reduce operating cost; Lee face is bluff body structure, when making gas, drop and particle flow through bluff body, produces two-way vortex street in its rear, increases the flow field turbulance at current equalizer rear, and it is more even that vortex street lateral transport realizes that three-phase is mixed.
For achieving the above object, the present invention adopts following technical proposals:
A kind of three-phase vortex street current equalizer, comprise front end guide plate and three-phase vortex street current-sharing baffle plate, the windward side of described three-phase vortex street current-sharing baffle plate is streamline structure, and the lee face of three-phase vortex street current-sharing baffle plate is bluff body structure; Described front end guide plate is connected with the streamline structure end of three-phase vortex street current-sharing baffle plate.
The streamline structure of described three-phase vortex street current-sharing baffle plate is straight line type, arc or interior hyperbolic type, fairing shape can affect the pressure drag of whole system, also can affect the form that rear vortex street produces simultaneously, can require to select multi-form streamline structure, to reach best current-sharing effect and the minimum pressure drag of system according to different tube shaped and current-sharing; When the steepness of pipeline gradually expanding section or gradually prominent section is greater than 1%, hyperbolic type preferably; Preferred straight line type or arc when being less than 1%; Bend bent angle is preferred interior hyperbolic type between 90-120 °; Be greater than 120 ° of preferred straight line types or arc.
The streamline structure rear of described three-phase vortex street current-sharing baffle plate can be opening or form of remaining silent, opening or the form of remaining silent can affect the vortex street rate of decay at bluff body rear, opening can be selected or form of remaining silent, to ensure that air-flow has best gas-solid-liquid distributed effect at specific conversion zone after vortex street homogenizing plate according to the distance size of bend, gradually expanding section or sudden expansion section and acting surface; Opening or form of remaining silent for criterion with the ratio of the Distance geometry pipeline equivalent diameter in acting surface and current-sharing baffle plate bluff body face, when ratio is greater than 3, adopts form of remaining silent, when ratio is less than 3, can adopt opening form.
The cross section of the bluff body structure of described three-phase vortex street current-sharing baffle plate is circle, quadrilateral or triangle; The shape of bluff body can affect the fluoran stream surface width of three-phase vortex street current-sharing baffle plate, thus affects generation frequency and the vortex street degree of stability of rear vortex street, can determine that fluoran stream surface amasss width according to different pipe diameter sizes.
The ratio of the described fluoran stream surface width of three-phase vortex street current-sharing baffle plate and the caliber of residing pipeline is 0.2-0.4, be preferably 0.277, the vortex street now produced can reach a stable state, select the shape of suitable bluff body structure further according to fluoran stream surface width, make rear vortex street reach optimum stability.
The bluff body structure of described three-phase vortex street current-sharing baffle plate adopts flat mouth form, concave form or convex form.The form of different bluff body structures can change the flowing space size of rear fluid, thus affects three-phase mixability, can adjust the form of bluff body structure, to reach best mixed effect according to the mixed proportion of gas-solid-liquid in incoming flow; If gas phase proportion is comparatively large in incoming flow, flat mouth form can be adopted; Solid phase proportion is comparatively large, and can adopt concave form, liquid phase proportion can adopt convex form more greatly.
The joint of described front end guide plate and three-phase vortex street current-sharing baffle plate adopts transition processing, namely joint is without vestige of plugging into, making fluid be equivalent to flow through the structure of a smooth arc-shaped when flowing through joint, reducing the resistance of incoming flow, reducing the pressure drag of whole system further.
The current equalizing method of three-phase vortex street current equalizer of the present invention, step is as follows:
For multi-form entrance, parameters is arranged: according to the shaded coefficient in the size of caliber and bluff body face, (in pipeline, the cross section of the bluff body structure of three-phase vortex street current equalizer accounts for the percentage of whole pipeline section, generally get between 50-80%) determine quantity and the span of current equalizer, then, according to the ducted mobility status of reality, suitably correction is adjusted to the size of three-phase vortex street homogenizing plate (free-stream flow rate of flow of fluid smaller part arranges the three-phase vortex street current equalizer that shape is less) and density degree (free-stream flow rate of flow of fluid smaller part layout is more intensive), finally determine current equalizer spacing further, make current-sharing best results.
Beneficial effect of the present invention:
(1) first the present invention carries out a current-sharing by front end guide plate to flue gas, subsequently, fluid flows through the three-phase vortex street current-sharing baffle plate be connected with front end guide plate, when flowing through windward side fairing part, the resistance of solid particle or drop fully reduces, and flows to lee face bluff body part smoothly, simultaneously, lee face bluff body part produces two-way vortex street, and the brute force of vortex rotates the solid particle or drop and gas phase Homogeneous phase mixing that make to flow through, finally reaches three-phase current-sharing effect;
(2) windward side of the present invention adopts fairing, the resistance that solid particle or drop produce when flowing through fairing is minimum, make particle or drop arrive bluff body face smoothly after and fully enter in the whirlpool after plate, also reduce system pressure drag while that three-phase being well-mixed after realizing bluff body plate;
(3) lee face of the present invention adopts bluff body, make fluid after bluff body, the vortex of extension constant temperature state is produced in the leading edge of plate, these vortexs are two-way, conical distribution, turning to of they is contrary, leaves the diameter after plate and increases gradually, simultaneously, the brute force of vortex rotates the solid particle or drop and gas phase Homogeneous phase mixing that make to flow through, finally reaches three-phase current-sharing effect;
(4) joint of front end guide plate and three-phase vortex street current-sharing baffle plate adopts transition processing, further reduces the resistance of device to solid particle and drop itself, and then reduces system resistance.
Accompanying drawing explanation
Fig. 1 is three-phase vortex street current equalizer structural representation of the present invention;
Fig. 2 is the setting type schematic diagram of three-phase vortex street current equalizer in racing bend, flaring pipeline and Divergent Piping
Fig. 3 is the electrical precipitator structural representation being provided with three-phase vortex street homogenizing plate of the present invention;
Wherein, 1-front end guide plate; 2-windward side streamline structure; 3-lee face bluff body structure;
211-entrance; 212-front end guide plate; 213-three-phase vortex street current-sharing baffle plate; 214-action section;
221-entrance; 222-front end guide plate; 223-three-phase vortex street current-sharing baffle plate; 224-action section;
231-entrance; 232-front end guide plate; 233-three-phase vortex street current-sharing baffle plate; 234-action section;
31-entrance; 32-right angle bend; 33-three-phase vortex street current equalizer; 34-dust chamber entrance; 35-dust chamber; 36-ash bucket; 37-exports.
Embodiment
The present invention is further illustrated in conjunction with the embodiments, should be noted that following explanation is only to explain the present invention, not limiting its content.
Embodiment 1
As shown in (a) in Fig. 1, a kind of three-phase vortex street current equalizer, comprises front end guide plate 1 and three-phase vortex street current-sharing baffle plate, and the windward side of described three-phase vortex street current-sharing baffle plate is streamline structure 2, and the lee face of three-phase vortex street current-sharing baffle plate is bluff body structure 3; Described front end guide plate 1 is connected with the streamline structure end of three-phase vortex street current-sharing baffle plate.Directly can be connected with conventional guide plate, also can be used alone.
The streamline structure 2 of described three-phase vortex street current-sharing baffle plate is straight line type (as Suo Shi (a) in Fig. 1), arc (as Suo Shi (b) in Fig. 1) or interior hyperbolic type (as Suo Shi (c) in Fig. 1), fairing shape can affect the pressure drag of whole system, also can affect the form that rear vortex street produces simultaneously.
Streamline structure 2 rear of described three-phase vortex street current-sharing baffle plate can be opening form (as shown in (d), (e), (f) in Fig. 1) or form of remaining silent (as shown in (a), (b), (c) in Fig. 1), opening or the form of remaining silent can affect the vortex street rate of decay at bluff body rear, opening can be selected or form of remaining silent, to ensure that air-flow has best gas-solid-liquid distributed effect at specific conversion zone after vortex street homogenizing plate according to the distance size of bend, gradually expanding section or sudden expansion section and acting surface.
The cross section of the bluff body structure of three-phase vortex street current-sharing baffle plate can elect circle, quadrilateral or triangle (as Suo Shi (c) in Fig. 1) as; The fluoran stream surface that the shape of bluff body can affect vortex shedder amasss width, thus affects generation frequency and the vortex street degree of stability of rear vortex street, can determine that fluoran stream surface amasss width according to different pipe diameter sizes.
When the ratio of the fluoran stream surface width of vortex shedder and the caliber of residing pipeline is 0.277, the vortex street now produced can reach a comparatively stable state, select the shape of suitable bluff body structure further according to fluoran stream surface width, make rear vortex street reach optimum stability.
The bluff body structure of described three-phase vortex street current-sharing baffle plate adopts flat mouth form, concave form or convex form (as Suo Shi (b) in Fig. 1).The form of different bluff body structures can change the flowing space size of rear fluid, thus affects three-phase mixability, can adjust the form of bluff body structure, to reach best mixed effect according to the mixed proportion of gas-solid-liquid in incoming flow;
The joint of described front end guide plate and three-phase vortex street current-sharing baffle plate adopts transition processing, namely joint is without vestige of plugging into, making fluid be equivalent to flow through the structure of a smooth arc-shaped when flowing through joint, reducing the resistance of incoming flow, reducing the pressure drag of whole system further.
Embodiment 2: the mechanism of three-phase vortex street current equalizer in turning road, flaring pipeline and Divergent Piping
As shown in Figure 2, be the setting type of three-phase vortex street current equalizer in turning road (in Fig. 2 (a)), flaring pipeline (in Fig. 2 (b)) and Divergent Piping (in Fig. 2 (c)), for turning road pipeline, air-flow is by when entering turning road from entrance 211, multiphase flow is through front end guide plate 212 (arranging multi-form guide plate according to different tube shaped), realize a gas phase current balance function, subsequently, on the basis of a gas phase current-sharing, fluid carries out three-phase mixing under the effect of the three-phase vortex street current-sharing baffle plate 213 (devising the size three-phase vortex street current-sharing baffle plate different with density degree according to entrance section each several part speed difference to realize high-efficiency three-phase current-sharing) of windward side fairing lee face bluff body structure, finally, fluid realizes three-phase Homogeneous phase mixing when arriving action section 214.
Three-phase vortex street current equalizer flaring bend and the sudden change mechanism of bend and turning road similar.
Embodiment 3: the application of three-phase vortex street current equalizer in electrical precipitator
Fig. 3 is the electrical precipitator structural representation being provided with three-phase vortex street homogenizing plate of the present invention, coal-fired flue-gas enters from entrance 31, when flowing through right angle bend 32, Dual-Phrase Distribution of Gas olid is at three-phase vortex street current equalizer 33, the size three-phase vortex street current-sharing baffle plate different with density degree is devised to realize high-efficiency three-phase current-sharing according to deduster entrance section each several part speed difference, three-phase vortex street current equalizer 33 magnitude setting with the caliber ratio of residing pipeline is: 5/3600mm, the span between three-phase vortex street current equalizer 33 be 300-600mm not etc.Two-phase Homogeneous phase mixing under the effect of three-phase vortex street current equalizer 33, the air-flow mixed enters dust chamber 35 through dust chamber entrance 34, owing to overcoming the gas-solid skewness problem that the reasons such as elbow cause, electrical precipitator entrance even particle distribution, the gas-liquid-solid three-phase mixing of the gas-particle two-phase making electrical precipitator (ESP) inner or wet cottrell (WESP) inside is more even, charging particle is even, agglomerating effect is better, removal efficiency improves, flue gas after purification is by exporting 37 discharges, and the grit of removing is discharged by ash bucket 36.
When not being provided with three-phase vortex street homogenizing plate of the present invention, multiphase flow carrys out flow section velocity distribution standard deviation δ higher than 0.4, in embodiment 3, under the effect of three-phase vortex street current equalizer, it is between 0.0889-0.1475 that multiphase flow carrys out flow section velocity distribution standard deviation δ, (δ≤0.1 is for outstanding to the requirement of the distribution of airspeed to meet U.S. RMS standard, δ≤0.2 is good, δ≤0.25 is qualified), carry out flow section solid particle, drop and distribution of gas even, drag characteristic, mixed effect all meets technical requirements, and it is better than the current-sharing effect of installing traditional deflector device.
In addition, after having installed three-phase vortex street current equalizer additional, compared with installing the system of delta wing baffle plate additional, system resistance reduces about 20%, makes system on the basis that three-phase current-sharing is raised the efficiency, further reduces the operating cost of system.
Above-described embodiment is the present invention's preferably mode of execution; but embodiments of the present invention are not restricted to the described embodiments; one of ordinary skill in the art should be understood that; on the basis of technological scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a three-phase vortex street current equalizer, is characterized in that, comprises front end guide plate and three-phase vortex street current-sharing baffle plate, and the windward side of described three-phase vortex street current-sharing baffle plate is streamline structure, and the lee face of three-phase vortex street current-sharing baffle plate is bluff body structure; Described front end guide plate is connected with the streamline structure end of three-phase vortex street current-sharing baffle plate.
2. a three-phase vortex street current equalizer, is characterized in that, the streamline structure of described three-phase vortex street current-sharing baffle plate is straight line type, arc or interior hyperbolic type.
3. a three-phase vortex street current equalizer, is characterized in that, the streamline structure rear of described three-phase vortex street current-sharing baffle plate is opening or form of remaining silent.
4. a kind of three-phase vortex street current equalizer as claimed in claim 1, is characterized in that, the cross section of the bluff body structure of described three-phase vortex street current-sharing baffle plate is circle, quadrilateral or triangle.
5. a kind of three-phase vortex street current equalizer as claimed in claim 1, is characterized in that, the ratio of the described fluoran stream surface width of three-phase vortex street current-sharing baffle plate and the caliber of residing pipeline is 0.2-0.4.
6. a kind of three-phase vortex street current equalizer as claimed in claim 5, is characterized in that, the ratio of the described fluoran stream surface width of three-phase vortex street current-sharing baffle plate and the caliber of residing pipeline is 0.277.
7. a kind of three-phase vortex street current equalizer as claimed in claim 1, is characterized in that, the bluff body structure of described three-phase vortex street current-sharing baffle plate adopts flat mouth form, concave form or convex form.
8. a kind of three-phase vortex street current equalizer as claimed in claim 1, is characterized in that, the joint of described front end guide plate and three-phase vortex street current-sharing baffle plate adopts transition processing.
9. the current equalizing method of the three-phase vortex street current equalizer described in any one of claim 1 to 8, it is characterized in that, step is as follows:
Three-phase vortex street current equalizer is directly connected with guide plate or is used alone, according to quantity and the span of the size of caliber and the shaded coefficient determination three-phase vortex street current equalizer in bluff body face, in pipeline, the cross section of the bluff body structure of three-phase vortex street current equalizer accounts for the percentage of whole pipeline section is 50-80%.
10. the three-phase vortex street current equalizer described in any one of claim 1 to 8 carries out the application of vortex street current-sharing synergy in turning road, flaring pipeline or Divergent Piping.
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| CN201410606424.2A CN104455897B (en) | 2014-10-31 | 2014-10-31 | Three-phase vortex street current sharing method and device |
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| CN201410606424.2A CN104455897B (en) | 2014-10-31 | 2014-10-31 | Three-phase vortex street current sharing method and device |
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| CN104455897B CN104455897B (en) | 2017-02-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906973A (en) * | 2015-05-31 | 2015-09-16 | 青岛海德威科技有限公司 | Vortex street mixer |
| CN106823652A (en) * | 2017-02-27 | 2017-06-13 | 西安交通大学 | A kind of system and method for the charged turbulent flow agglomerated particle thing of utilization ultrasonic atomization |
| CN107552237A (en) * | 2017-08-21 | 2018-01-09 | 广东美的制冷设备有限公司 | Ion purifier |
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| CN202427375U (en) * | 2011-12-16 | 2012-09-12 | 无锡威孚力达催化净化器有限责任公司 | Flow guiding and spraying mixer device |
| CN202983542U (en) * | 2012-11-21 | 2013-06-12 | 江苏中建材环保研究院有限公司 | Novel efficient silicon controlled rectifier (SCR) denitration deamination/smoke mixing device |
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| US4498786A (en) * | 1980-11-15 | 1985-02-12 | Balcke-Durr Aktiengesellschaft | Apparatus for mixing at least two individual streams having different thermodynamic functions of state |
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| CN104906973A (en) * | 2015-05-31 | 2015-09-16 | 青岛海德威科技有限公司 | Vortex street mixer |
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| CN107552237A (en) * | 2017-08-21 | 2018-01-09 | 广东美的制冷设备有限公司 | Ion purifier |
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| Publication number | Publication date |
|---|---|
| CN104455897B (en) | 2017-02-01 |
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