CN114134497B - Nozzle for spraying powder and spraying device - Google Patents
Nozzle for spraying powder and spraying device Download PDFInfo
- Publication number
- CN114134497B CN114134497B CN202111443517.4A CN202111443517A CN114134497B CN 114134497 B CN114134497 B CN 114134497B CN 202111443517 A CN202111443517 A CN 202111443517A CN 114134497 B CN114134497 B CN 114134497B
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- China
- Prior art keywords
- powder
- inner core
- nozzle
- spraying
- bottom end
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- 239000000843 powder Substances 0.000 title claims abstract description 86
- 238000005507 spraying Methods 0.000 title claims abstract description 61
- 239000004020 conductor Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 abstract description 3
- 230000005684 electric field Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
Abstract
The invention provides a nozzle for spraying powder and a spraying device, and relates to the technical field of powder spraying in the metallurgical industry. The nozzle for spraying powder can reduce the adhesion of powder near a nozzle and avoid the generation of large-particle accumulated powder.
Description
Technical Field
The invention relates to the technical field of powder spraying in the metallurgical industry, in particular to a nozzle for spraying powder and a spraying device.
Background
The existing nozzle for the powder spraying device consists of an outer sleeve and an inner core fixed in the outer sleeve, wherein the outer sleeve and the inner core are of a rotary structure, a cavity is formed between the outer sleeve and the inner core, electrostatic powder and compressed air are mixed and then enter from an upper inlet of the nozzle, and the electrostatic powder is sprayed out from a nozzle at the bottom of the cavity after passing through the cavity.
The existing nozzles for powder spraying devices have the following disadvantages:
1. when the powder with static electricity is sprayed out from the nozzle, as the compressed air is pressurized at the upper part of the nozzle and in the cavity of the nozzle, the compressed air enters the atmosphere space after being sprayed out from the nozzle and can expand rapidly, and the compressed air is sprayed out from the nozzle and diffuses fast, so that negative pressure holes are generated at the bottom of the inner core, and the scattered compressed air and the powder are pulled and pulled, so that the surrounding air is difficult to supplement in time to generate negative pressure, and under the condition that the powder is sprayed out from the nozzle for a long time, the negative pressure gradually attracts the powder in the spraying process to press the bottom plane of the inner core, so that the powder is adhered to the bottom surface of the umbrella-shaped inner core;
2. because the outer sleeve of the nozzle and the umbrella-shaped inner core are gradually-expanded cavities, powder can be diffused and sprayed along the gradually-expanded cavities when being sprayed out along with compressed air, and the spraying outlet can be diffused along the spraying direction, so that negative pressure cavities at the bottom of the inner core are formed, and the powder sticking condition at the bottom of the umbrella-shaped inner core is aggravated.
For the reasons mentioned above, when the attached powder is too much, it will fall down due to gravity or uncertain external force, if the product of electrostatic powder spraying is located under the nozzle or the powder spraying direction, the large particles formed by the accumulated powder will fall on the spraying member or the compressed air sprayed by the nozzle will blow onto the sprayed product, causing uneven powder, powder nodules or powder lumps attached to the surface of the sprayed product, and generating unqualified products.
In view of this, the present inventors have devised a nozzle for spraying powder and a spraying device for solving the problems of the prior art through repeated experiments based on production design experiences conducted in the art and related fields for many years.
Disclosure of Invention
The invention aims to provide a nozzle for spraying powder and a spraying device, which can reduce the adhesion of the powder near a nozzle and avoid the generation of large-particle accumulated powder.
In order to achieve the above object, the present invention provides a nozzle for spraying powder, wherein the nozzle comprises an outer sleeve and an inner core, the inner core is arranged in the outer sleeve in a penetrating manner, an annular space is arranged between the inner core and the outer sleeve, an annular outlet for spraying the powder is formed at the bottom end of the annular space, the bottom edge of the outer sleeve is sharp-angled and charges the powder for the first time, the bottom end of the inner core protrudes out of the outer sleeve, the outer edge of the bottom end face of the inner core is sharp-angled and charges the powder for the second time, and the distance between the bottom end face of the inner core and the bottom edge of the outer sleeve is larger than the width of the annular space.
The nozzle for spraying powder as described above, wherein a distance between a bottom end surface of the inner core and a bottom edge of the outer jacket is 9 to 50mm.
The nozzle for spraying powder as described above, wherein the outer sheath and the inner core are respectively made of a metallic conductive material.
The nozzle for spraying powder as described above, wherein the inner core has a cylindrical shape at an upper portion thereof and is surrounded with a bottom edge of the outer jacket to form the annular outlet.
The nozzle for spraying powder as described above, wherein the outer sidewall of the bottom end of the inner core has a horn shape with a gradually expanding diameter.
The nozzle for spraying powder as described above, wherein the inner wall of the bottom end of the outer jacket is correspondingly provided in a bell mouth shape of gradually expanding diameter.
The nozzle for spraying powder as described above, wherein the inner wall of the bottom end of the outer jacket is cylindrical, and the outer wall of the bottom end of the outer jacket is tapered toward the bottom edge.
A nozzle for spraying powder as described above, wherein a distance between a bottom end face of the inner core and a bottom edge of the outer jacket is greater than a width of the annular space.
The invention also proposes a spray device for spraying a powder, wherein the spray device has a nozzle as described above.
The spraying device for spraying powder as described above, wherein the outer sheath and the inner core are made of a metal conductive material, respectively, the spraying device includes an electrostatic generator, and the electrostatic generator wire is electrically connected to the outer sheath and the inner core, respectively.
Compared with the prior art, the nozzle for spraying powder and the spraying device provided by the invention have the following characteristics and advantages:
according to the nozzle for spraying powder and the spraying device, the bottom edge of the outer sleeve of the nozzle and the outer edge of the bottom end face of the inner core are respectively in the sharp angle shape, so that an electric field can be generated, when powder is sprayed out from the annular outlet, the powder is firstly charged at the sharp angle of the bottom edge of the outer sleeve and then secondarily charged at the sharp angle of the outer edge of the bottom end face of the inner core, so that the charging rate and the charging quantity of sprayed powder are increased, the capability of attaching the powder to a sprayed product is enhanced, the powder attachment rate of the powder is improved, and the waste of the powder is reduced.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic view of a nozzle according to an embodiment of the present invention;
fig. 2 is a schematic structural view of another embodiment of the nozzle according to the present invention.
Reference numerals illustrate:
100. a nozzle; 10. A jacket;
11. a bottom edge; 20. An inner core;
21. a bottom end surface; 30. Annular spacing;
31. an annular outlet; l1, distance;
l2, width.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. However, the specific embodiments of the invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.
The invention provides a nozzle 100 for spraying powder, as shown in fig. 1 and 2, the nozzle 100 comprises a jacket 10 and an inner core 20, the inner core 20 is penetrated in the jacket 10, an annular space 30 is arranged between the inner core 20 and the jacket 10, the bottom end of the inner core 20 protrudes out of the jacket 10, the distance L1 between the bottom end surface 21 of the inner core 20 and the bottom edge 11 of the jacket 10 is larger than the width L2 of the annular space 30, the bottom end of the annular space 30 is open and is provided with an annular outlet 31 for spraying powder, the bottom edge 11 of the jacket 10 is sharp-angled and charges the powder for the first time, and the outer edge of the bottom end surface 21 of the inner core 20 is sharp-angled and charges the powder for the second time.
The invention also proposes a spraying device for spraying a powder, which spraying device has a nozzle 100 as described above.
According to the nozzle 100 and the spraying device for spraying powder, the bottom edge 11 of the outer sleeve 10 of the nozzle 100 and the outer edge of the bottom end face 21 of the inner core 20 are respectively in a sharp angle shape so as to generate electric fields, and the bottom edge 11 of the outer sleeve 10 and the bottom end face 21 of the inner core 20 are further distant, so that the powder can be charged twice through two electric fields.
In an alternative example of this embodiment, the distance L1 between the bottom end surface 21 of the inner core 20 and the bottom edge 11 of the outer sheath 10 is 9 to 50mm.
In an alternative embodiment of the present invention, the outer sheath 10 and the inner core 20 are each made of a metallic conductive material.
According to the nozzle 100 and the spraying device for spraying powder, the bottom end of the inner core 20 protrudes out of the outer sleeve 10, the distance between the sharp angle of the bottom edge 11 of the outer sleeve 10 and the sharp angle of the outer edge 21 of the bottom end face of the inner core 20 is increased, when the nozzle 100 is connected with the electrostatic generator, the repulsive force of electric fields generated between the sharp angle of the bottom edge 11 of the outer sleeve 10 and the sharp angle of the outer edge 21 of the bottom end face of the inner core 20 is greatly weakened, the mutual influence of the electric field intensities is small, the electric field intensities are small, and therefore the sharp angle of the bottom edge 11 of the outer sleeve 10 and the sharp angle of the outer edge 21 of the bottom end face of the inner core 20 can charge powder respectively.
When the nozzle 100 and the spraying device for spraying powder provided by the invention are used, compressed air and powder are sprayed out together from the annular outlet 31 at a high speed, after the constraint of the annular outlet 31 is removed, the powder is sprayed out along the central column of the inner core 20 and can spread to the periphery, and as the bottom end of the inner core 20 extends out of the outer sleeve 10 for a certain distance, the powder flow rate at the position where the bottom end of the inner core 20 is reached is greatly reduced, the capability of generating negative pressure at the bottom of the inner core 20 of the powder is greatly reduced, the capability of forming cavities is greatly reduced, the quantity of adhering and accumulating powder at the bottom of the inner core 20 is correspondingly reduced, the condition of forming accumulated powder at the bottom of the inner core 20 is also greatly reduced, the powder dropping is avoided, the spraying uniformity is ensured, and the quality of a sprayed product is improved.
In an alternative embodiment of the invention, the upper portion of the core 20 is cylindrical and encloses the bottom edge 11 of the jacket 10 to form an annular outlet 31.
In an alternative example of this embodiment, the outer sidewall of the bottom end of the inner core 20 has a flared shape with a gradually expanding diameter. With the above structure, when the powder ejected from the annular outlet 31 flows through the bottom end of the inner core 20, since the cross section of the bottom end is gradually enlarged, the flow velocity of the powder is reduced in advance, and the capacity of the cavity formed by the negative pressure generated at the bottom of the inner core 20 is further reduced, so that the powder accumulation at the bottom end face 21 of the inner core 20 is further avoided.
In an alternative embodiment of the present invention, as shown in fig. 1, the inner wall of the bottom end of the outer sleeve 10 is cylindrical, and the outer wall of the bottom end of the outer sleeve 10 is tapered toward the bottom edge 11.
In another alternative embodiment of the present invention, as shown in fig. 2, the inner wall of the bottom end of the outer sleeve 10 is correspondingly configured to be a bell mouth shape with gradually expanding diameter.
In an alternative embodiment of the present invention, the outer jacket 10 and the inner core 20 are each made of a metallic conductive material, and the spraying device includes an electrostatic generator electrically connected to the outer jacket 10 and the inner core 20, respectively.
The detailed explanation of the embodiments described above is only for the purpose of explaining the present invention so as to enable a better understanding of the present invention, but the descriptions should not be construed as limiting the present invention in any way, and in particular, the respective features described in the different embodiments may be arbitrarily combined with each other to constitute other embodiments, and these features should be understood as being applicable to any one embodiment, except for the explicitly contrary descriptions.
Claims (8)
1. The utility model provides a nozzle for spraying powder, its characterized in that, the nozzle includes overcoat and inner core, the inner core wears to locate in the overcoat, the inner core with annular interval has between the overcoat, annular interval's bottom is open and is formed with the annular export that supplies powder spun, the bottom protrusion of inner core in the overcoat, just the bottom surface of inner core with the distance between the bottom edge of overcoat is greater than annular interval's width, the bottom edge of overcoat is sharp angle form and right the first time of powder charge, the lateral wall of its bottom of inner core is the loudspeaker form of gradual expanding, because the bottom cross-section enlarges gradually, the powder velocity of flow reduces in advance, the outer fringe of its bottom surface of inner core is sharp angle form and right the second time of powder charge has increased the charge rate and the charge quantity of powder.
2. A nozzle for spraying powder according to claim 1, wherein the distance between the bottom end surface of the inner core and the bottom edge of the outer sheath is 9 to 50mm.
3. The nozzle for spraying powder of claim 1, wherein the outer sheath and the inner core are each made of a metallic conductive material.
4. A nozzle for spraying powder as claimed in claim 1, wherein the upper portion of the inner core is cylindrical and forms the annular outlet with the bottom edge of the outer sleeve.
5. A nozzle for spraying powder according to any one of claims 1 to 4, wherein the inner wall of the bottom end of the outer sleeve is provided with a bell mouth shape with a gradually expanding diameter.
6. The nozzle for spraying powder according to any one of claims 1 to 4, wherein an inner wall of a bottom end of the outer jacket is cylindrical, and an outer wall of the bottom end of the outer jacket is tapered toward the bottom edge.
7. A spray device for spraying a powder, characterized in that the spray device has a nozzle according to claim 1.
8. The spray device for spraying powder of claim 7, wherein the outer sheath and the inner core are each made of a metallic conductive material, the spray device comprising an electrostatic generator, the electrostatic generator wire being electrically connected to the outer sheath and the inner core, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443517.4A CN114134497B (en) | 2021-11-30 | 2021-11-30 | Nozzle for spraying powder and spraying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443517.4A CN114134497B (en) | 2021-11-30 | 2021-11-30 | Nozzle for spraying powder and spraying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114134497A CN114134497A (en) | 2022-03-04 |
| CN114134497B true CN114134497B (en) | 2024-01-26 |
Family
ID=80389975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111443517.4A Active CN114134497B (en) | 2021-11-30 | 2021-11-30 | Nozzle for spraying powder and spraying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114134497B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3263127A (en) * | 1961-04-14 | 1966-07-26 | Sames Mach Electrostat | Means for electrostatic coating |
| GB1406358A (en) * | 1972-02-18 | 1975-09-17 | Air Ind | Electrostatic projection nozzles |
| EP0553052A1 (en) * | 1992-01-22 | 1993-07-28 | José De Fusco Lupo | Gun for electrostatic spraying of powders of different colours and characteristics |
| CN2471425Y (en) * | 2001-05-14 | 2002-01-16 | 浙江大学 | Electrostatic powder spray gun with secondary ionized magnetic control |
| CN102500485A (en) * | 2011-11-17 | 2012-06-20 | 中冶京诚工程技术有限公司 | Annular discharging nozzle |
| CN110899012A (en) * | 2019-12-12 | 2020-03-24 | 中冶京诚工程技术有限公司 | Powder spray gun |
| CN111545368A (en) * | 2020-05-15 | 2020-08-18 | 潍坊东方钢管有限公司 | Lengthened electrostatic powder spray gun device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10138917A1 (en) * | 2001-08-08 | 2003-03-06 | Itw Gema Ag | powder spraycoating |
| DE10217653A1 (en) * | 2002-04-19 | 2003-12-11 | Itw Gema Ag | spray coater |
| US7128277B2 (en) * | 2003-07-29 | 2006-10-31 | Illinois Tool Works Inc. | Powder bell with secondary charging electrode |
-
2021
- 2021-11-30 CN CN202111443517.4A patent/CN114134497B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3263127A (en) * | 1961-04-14 | 1966-07-26 | Sames Mach Electrostat | Means for electrostatic coating |
| GB1406358A (en) * | 1972-02-18 | 1975-09-17 | Air Ind | Electrostatic projection nozzles |
| EP0553052A1 (en) * | 1992-01-22 | 1993-07-28 | José De Fusco Lupo | Gun for electrostatic spraying of powders of different colours and characteristics |
| CN2471425Y (en) * | 2001-05-14 | 2002-01-16 | 浙江大学 | Electrostatic powder spray gun with secondary ionized magnetic control |
| CN102500485A (en) * | 2011-11-17 | 2012-06-20 | 中冶京诚工程技术有限公司 | Annular discharging nozzle |
| CN110899012A (en) * | 2019-12-12 | 2020-03-24 | 中冶京诚工程技术有限公司 | Powder spray gun |
| CN111545368A (en) * | 2020-05-15 | 2020-08-18 | 潍坊东方钢管有限公司 | Lengthened electrostatic powder spray gun device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114134497A (en) | 2022-03-04 |
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