CN201848234U - Electrostatic fluidized bed - Google Patents
Electrostatic fluidized bed Download PDFInfo
- Publication number
- CN201848234U CN201848234U CN2010206041430U CN201020604143U CN201848234U CN 201848234 U CN201848234 U CN 201848234U CN 2010206041430 U CN2010206041430 U CN 2010206041430U CN 201020604143 U CN201020604143 U CN 201020604143U CN 201848234 U CN201848234 U CN 201848234U
- Authority
- CN
- China
- Prior art keywords
- chamber
- air
- fluidized bed
- powder
- electrostatic fluidized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 4
- 210000002268 wool Anatomy 0.000 claims description 4
- 238000000576 coating method Methods 0.000 abstract description 13
- 239000011248 coating agent Substances 0.000 abstract description 12
- 239000007921 spray Substances 0.000 abstract description 6
- 238000005243 fluidization Methods 0.000 abstract 3
- 238000005192 partition Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000825 pharmaceutical preparation Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 229940126534 drug product Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007909 solid dosage form Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Electrostatic Spraying Apparatus (AREA)
Abstract
The utility model discloses an electrostatic fluidized bed, which is used for producing a powder cloud of a dry coating. The electrostatic fluidized bed comprises a shell, a high-pressure charging medium and an air current distribution plate, wherein the high-pressure charging medium and the air current distribution plate are arranged in the shell and partition the shell into an air distribution chamber, an ionized air chamber and a fluidization chamber which are communicated in turn from bottom to top; the air distribution chamber is provided with an air current inlet; and the fluidization chamber is provided with a charged powder outlet. When the electrostatic fluidized bed is used, high-pressure air enters the air distribution chamber through the air current inlet, enters the ionized air chamber after being ionized by the high-pressure charging medium and passes through the air current distribution plate so as to act on powder filled in the upper chamber; and when the speed of air current surpasses the critical fluidization speed of the powder, the power flows up and down so as to form a uniformly-dispersed charged powder cloud, is brought out of the charged powder outlet along with the air current, and is conveyed to a coating pan of a dry powder coating machine. The fluidized bed is used instead of the conventional corona or friction electrostatic spray gun, so that the powder is distributed more uniformly and the electrostatic fluidized bed is more convenient and safer to use.
Description
Technical field
The utility model relates to the parts of dry-method coating equipment, particularly electrostatic fluidized bed.
Background technology
Drug products mainly exists with solid pharmaceutical preparation and two kinds of formulations of liquid preparation, in the actual production of solid pharmaceutical preparation, because need reach that drug smell is covered, purposes such as the release position when protection against the tide, lucifuge, control drug use and rate of release, need the specific material of use carry out Cotton seeds to it.
The approach of drug coating is mainly contained two kinds of wet method dressing and dry-method coatings, in dry-method coating, the powder that needs to be used for dressing evenly disperse and make it be with static after be transported in the coating pan, prior art is to realize the charged of powder and conveying by electrostatic gun, mainly contain halation discharge spray gun and triboelectrostatic gun, but all there is certain deficiency: a. halation discharge spray gun: 1. be easy to generate the reverse ion phenomenon, especially to the solid dosage forms of weakly conducting, cause coating thickness less, need repeatedly to spray to increase thickness, dressing efficient is low; 2. spray gun need use the high-field electrode of 20～120KV, and operator's direct control or nearly body are observed, and be dangerous higher.B. triboelectrostatic gun: give birth to electrical efficiency for reaching higher friction, air-flow velocity must be higher than the air-flow velocity of halation discharge spray gun far away, when high velocity air and powder enter coating pan, because the coating pan space is limited, more serious particle bounce-back will be produced, upset the direction of motion of powder air-flow, thereby damaged the uniformity of powder distribution and coating layer thickness, the adjustability of air-flow velocity is poor.
At above-mentioned deficiency,, make it overcome the shortcoming of the said equipment to carrying and make the charged equipment of powder to improve to powder in the prior art.
Summary of the invention
In view of this, the utility model provides a kind of electrostatic fluidized bed, this fluid bed powder is evenly disperseed and be with electric charge after be delivered in the coating pan, avoid the generation of reverse charging and faraday cup effect, and feed flow can be according to the actual conditions flexible modulation, simultaneously, high-field electrode is away from the operator, and is safe in utilization, convenient.
Electrostatic fluidized bed of the present utility model comprises housing, be arranged at the high-voltage charging medium in the housing and be arranged at the airflow-distribution board of high-voltage charging medium top, described high-voltage charging medium and airflow-distribution board are divided into air-distribution chamber, the ionized air chamber that is communicated with successively from the bottom to top with housing and are used to produce the fluidising chamber of charged powder cloud, the air-distribution chamber is provided with airflow inlet, and fluidising chamber is provided with the charged powder outlet.
Further, described fluidising chamber epimere cross-sectional area dwindles gradually from the bottom to top and forms the flue gas accelerating sections, and described charged powder outlet is arranged at flue gas accelerating sections top;
Further, the emptying passage is set in the described fluidising chamber, described emptying passage upper edge emptying airflow direction sets gradually the powder filter net and is used to control the flow control valve of the charged powder flue gas flow in charged powder exit;
Further, described high-voltage charging medium is metal wool electrode or brush electrode.
The beneficial effect of utility model: electrostatic fluidized bed of the present utility model has the following advantages:
1. do not have electric field between powder and the matrix during dressing, do not have reverse charging and faraday cup effect, so the powder utilization height, powder distribution is even;
2. owing to there is not high voltage electric field, powder flows to the influence that only is subjected to orifice design and air-flow trend, and is not subjected to the influence of power line, so powder distribution is more even;
3. high-field electrode is arranged on fluidising chamber inside, therefore, has avoided the operator near excessively from high-field electrode when operation, and security is higher;
4. powder flue gas feed flow is adjustable, and is easy to use flexible.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is a structural representation of the present utility model.
The specific embodiment
Fig. 1 is a structural representation of the present utility model, as shown in the figure: the electrostatic fluidized bed of present embodiment, comprise housing 1, be arranged at high-voltage charging medium 2 and the airflow-distribution board 3 that is arranged at high-voltage charging medium 2 tops in the housing 1, described high-voltage charging medium 2 and airflow-distribution board 3 are divided into housing 1 the air-distribution chamber 4 that is communicated with successively from the bottom to top, ionized air chamber 5 and the fluidising chamber 6 that is used to produce the charged powder cloud, air-distribution chamber 4 is provided with airflow inlet 4a, fluidising chamber 6 is provided with charged powder outlet 6a, during use, gases at high pressure enter down indoor by airflow inlet, ionization under the effect of high-field electrode, pass then to act on behind the pore and be contained in indoor powder, after air velocity surpasses the critical fludization velocity of powder, powder seethes up and down and forms homodisperse powder flue gas, and taken out of charged powder outlet with air-flow, be delivered to the coating pan of dry powder dressing machine.
In the present embodiment, described fluidising chamber 6 epimere cross-sectional areas dwindle gradually from the bottom to top and form the flue gas accelerating sections, described charged powder outlet 6a is arranged at flue gas accelerating sections top, the charged powder outlet is arranged on the airflow direction, can at utmost reduce the disturbance of airflow convection powder, it is more even that powder is disperseed.
In the present embodiment, in the described fluidising chamber 6 emptying passage 7 is set, described emptying passage 7 upper edge emptying airflow directions set gradually powder filter net 8 and are used to control the flow control valve 9 of the charged powder flue gas flow at charged powder outlet 6a place, when the changes in flow rate of charged powder exit, by flow control valve fluidising chamber is replenished air and discharges unnecessary air, keep fluidising chamber's internal pressure balance, be in stable state, be uniformly dispersed to guarantee the powder cloud in the fluidising chamber.
In the present embodiment, described high-voltage charging medium 2 is the metal wool electrode, the metal wool electrode is electrically connected with high pressure generator, make it possess the function of ionized air, simple in structure, be easy to obtain, certainly, other can make the electric elements of air ionization employing brush electrodes etc., can realize the purpose of this utility model equally.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (4)
1. electrostatic fluidized bed, it is characterized in that: comprise housing (1), be arranged at the high-voltage charging medium (2) in the housing (1) and be arranged at airflow-distribution board (3) above the high-voltage charging medium (2), described high-voltage charging medium (2) and airflow-distribution board (3) are divided into air-distribution chamber (4), ionized air chamber (5) that are communicated with successively from the bottom to top with housing (1) and are used to produce the fluidising chamber (6) of charged powder cloud, air-distribution chamber (4) is provided with airflow inlet (4a), and fluidising chamber (6) is provided with charged powder outlet (6a).
2. electrostatic fluidized bed according to claim 1 is characterized in that: described fluidising chamber (6) epimere cross-sectional area dwindles gradually from the bottom to top and forms the flue gas accelerating sections, and described charged powder outlet (6a) is arranged at flue gas accelerating sections top.
3. electrostatic fluidized bed according to claim 2, it is characterized in that: emptying passage (7) is set in the described fluidising chamber (6), and described emptying passage (7) upper edge emptying airflow direction sets gradually powder filter net (8) and is used to control the flow control valve (9) of the charged powder flue gas flow that charged powder outlet (6a) locates.
4. electrostatic fluidized bed according to claim 3 is characterized in that: described high-voltage charging medium (2) is metal wool electrode or brush electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206041430U CN201848234U (en) | 2010-11-12 | 2010-11-12 | Electrostatic fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206041430U CN201848234U (en) | 2010-11-12 | 2010-11-12 | Electrostatic fluidized bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201848234U true CN201848234U (en) | 2011-06-01 |
Family
ID=44090649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206041430U Expired - Lifetime CN201848234U (en) | 2010-11-12 | 2010-11-12 | Electrostatic fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201848234U (en) |
-
2010
- 2010-11-12 CN CN2010206041430U patent/CN201848234U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110601 |