CA1170034A - Powder sprayer - Google Patents
Powder sprayerInfo
- Publication number
- CA1170034A CA1170034A CA000368403A CA368403A CA1170034A CA 1170034 A CA1170034 A CA 1170034A CA 000368403 A CA000368403 A CA 000368403A CA 368403 A CA368403 A CA 368403A CA 1170034 A CA1170034 A CA 1170034A
- Authority
- CA
- Canada
- Prior art keywords
- ducts
- fact
- powder
- sprayer according
- powder sprayer
- 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
Links
Abstract
ABSTRACT
A powder sprayer with electrostatic charging capacity by means of which a colouring powder can be elec-trostatically charged all over the entire surface of the particles in a simple and effective manner. The powder sprayer comprises a number of curved charging ducts of long extension made of electrically non-conducting material which ducts are coated with electrically conductive layers along the main portion of their extension, said coated layers being connected to conductors outgoing from said layers, whereby a charging of the powder material takes place during its movement through said charging ducts after contact with the inner walls of the ducts when the sprayer is in use.
A powder sprayer with electrostatic charging capacity by means of which a colouring powder can be elec-trostatically charged all over the entire surface of the particles in a simple and effective manner. The powder sprayer comprises a number of curved charging ducts of long extension made of electrically non-conducting material which ducts are coated with electrically conductive layers along the main portion of their extension, said coated layers being connected to conductors outgoing from said layers, whereby a charging of the powder material takes place during its movement through said charging ducts after contact with the inner walls of the ducts when the sprayer is in use.
Description
" ~7C~03~
The present invention relates to a powder sprayer with electrostatic capacity.
It is a main object of the invention to provide a sprayer, by means of which for example colouring powder in a simp].e and efficient manner can be electrostatically charged, so that all the surfaces of the particles will be completely charged~
According to the present invention, there is provided a powder sprayer with electrostatic charging capacity, comprising a number of charging ducts of long extension and made of electrically non-conducting material, said ducts being coated with electrically conducting layers al~ong the main portion of their extension and said coated layers being connected to conductor means outgoing from said layers, wherehy an electrostatically charging of the powder material tales place during the movement of the powder material through said charging ducts after contact -with the inner walls of the ducts, when the sprayer is in 5 e .
. .
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An example of embodiment of the invention will be described in the following, reference being made to the accompanying drawings, in which Fig. 1 is a perspective view of a powder sprayer designed according to the invention, Fig. 2 shows the rear end of the sprayer in partly sectional view, Fig. 3 shows a transportation ~nd charging tube forming part of the sprayer and a conductor connected with this tube, Fig. 4 shows the front end of the sprayer in a partly sectional view, and Figs. 5 and 6 show khe rear end and front end res-pectively of the sprayer in a partly sectional view according to another example of embodiment.
A powder sprayer 1 designed according to the inven-tion is, as mentioned above, especially adapted for use in connec- -tion with powder spraying, the sprayer then preferably being supported and operated by a painting robot. The sprayer- 1 comp-rises substantially three components. A rear component 2 is a connecting component~ which can be coupled together with a hose, in which colouring powder is transported from a colour bin. The colouring powder is transported throuyh a mid component 3 at the same time as it is electrostaticalIy charged, and a front component 4 forms the noz21e of the sprayPr. The mid component 3 comprises a tube 5 preferably made of plastic material. A core of a number of tubes 6 of long extension but of smaller dimension and heli-cally twisted together are enclosed in said tube 5. Also these small tubes 6 are preferably made of plastics or some other non-conducting material. A layer of metal 7 or any other conducting material surrounds each one of these charging tubes 6 r as is evident from Fig. 3. At the rear end of the charging tubes 6, as seen in the direction of transportatiGn, there is a conductor 8 connected to said ~etal layer 7, by way of example by means of a soldered joint 9. These conductors 8 converge and ~lend into a common conductor 10/ which is led through an opening of the outex tube 5 to the outside of the tube and can be grounded or connected to a power source. Each one of the terminal ends of the charging tubes 6 are introduced into a circular core, a rear core 11 and .
.. .
.
3~
a front core 12 respectively. These cores 11, 12 along their periphery exhibit a number of through openings 13/ which are interspaced in a ringshaped arrangement and adapt~d to the respective charging tubes 60 A cone 14 is provided in the centre of the rear core 11 and points in a direction against the direc-tion of ~ransportation, said cone functioning as an atomizer for the powder rushing in. The rear end of the outer tube 5 supports a sleeve 15, which at the one of its ends pointing away from the tube 5 is provided with connections 16 for coupling together the colour sprayer 1 and a hose, in which colouring powder is trans-ported from a colour hopper~ The nozzle 4 is attached to the opposite end of the ~ube. This nozzle component 4 comprises a spray nozzle 17, a connecting tube 18 and a throttle sleeve 19.
The throttle sleeve 19 is with its rear end by means of a coup-ling sleeve 20 connected with the charging tubes 6 and surrounds the front end of the outer tube 5 and exhibits a conically taper-ing through-passage 21 extending in direction away from said tube, in which passage the charged powder is guided towards the central axis of the sprayer 1 and the nozzle 17. The connecting tube 18 is with its rear end introduced into and held by the throttle sleeve 19. A connecting ring 22 is threaded onto the tube 18 at ~
its front end, and said ring 22 in its turn supports said sprayer nozzle 17. The connecting ring 22 i5 traversed by an axial duct 23, which at its reax end is connected with a hose 24 for the supply of gas, by way of example air. rrhe nozzle 17 comprises a sleeve 25, which at its front end supports an end wall 26, which is provided with an opening 27 in central position. This opening 27 exhibits a chamfered edge 27A on its outside and a stepped shoulder 27B on its inside. The front end of a diffuser 28 is fitted into this stepped shoulder 27B, said diffuser exhibit-ing the form of a tube made of porous permeable material trans-mitting the air, by way of example manufactured in a sintering process. The rear end of the diffuser 28 is threaded into the connecting ring 22 and bears against the front end of the connect-ing tube 18. Gas, that is introduced at an overpressure through the duct 23 of the connecting ring, flows into the chamber 29 formed between the nozzle 17 and the diffuser 28, whereafter it is subsequently spread through the small openings existing in the porous material, of which the diffuser is made, before it is ~7~39~
flowing into the front portion of the throug~-duct 30 of the nozzle 4. During this phase an overpressure is created in the front portion of the nozzle, the powder and the gas current being compressed in order to expand and form a mist, when the mixture emerges out of the nozzle 17. By variation of this over-pressure the spreading of the powder can be regulated.
The function of the colour sprayer described above will now be described more in detail. The sprayer 1, as mentioned above, is with its rear end 16 by means of a hose connected with a colour hopper. The colour powder is by means of an air stream transported through the rear portion 2 of the sprayer 1 and by means of the cone 14 spread in outwards direc-tion, so that it flows in through the openings 13 of the core 11 and further in through the charging tubes 6. ~s menti~ned above, these tubes 6 are either connected with the ground or with a power source, by way of example a high tension power source, by means of the conductors 8, 10. On account of the helical form of the charging tu~es 6 the powder whirls around in them during the transportation, and all sides of the particles will arrive in contact with the walls of the tube. When emerging out of these charging tubes 6 the powder is thoroughly charged.
After emerging from these tubes 6 the flow of powder is throttled by the throttling component 19 and is led through the connecting tube 18 to the spreading nozzle 17 through the flow duct 30. As has already been described, the powder is m~ixed with the air flowing in through the duct 24 and the diffuser 28 and is comp-ressed in order to expand when flowing out of the orifice of the nozzle 27, as has been described above. The powder will then be spread in the form of a mist~ and on account of its electrostatic charge it will find a way to the object, which shall be painted, and stick to the same. Also parts of the painting object, which are difficult to reach, will be covered with colour.
The powder sprayer, which is shown in Figs. 5 and 6, is of similar design as the sprayer described above, and such parts as are common for the two examples of embodiment are indi-cated with the same reference numbers.
As distinguished from the earlier described sprayer the sprayer according to Figs. S and 6 is provided with charging ducts 6' of irregular curvature instead of helically curved ducts.
~7~3~
Each duct 6' extends in a number of different planes, as is for example shown in the Figs. 5 and 6.
The function of this powder sprayer is the same as the function of the sprayer described above. The powder~
which is led through the sprayer and its charging ducts 6', will be effectively charged during the movement of the powder through said charging ducts 6' after whirling around and contact-ing the innex walls of said ducts 6'.
The invention is not limited to the embodiments described above and illustrated in the drawings, but can be varied as to its details within the scope of the following claims.
The present invention relates to a powder sprayer with electrostatic capacity.
It is a main object of the invention to provide a sprayer, by means of which for example colouring powder in a simp].e and efficient manner can be electrostatically charged, so that all the surfaces of the particles will be completely charged~
According to the present invention, there is provided a powder sprayer with electrostatic charging capacity, comprising a number of charging ducts of long extension and made of electrically non-conducting material, said ducts being coated with electrically conducting layers al~ong the main portion of their extension and said coated layers being connected to conductor means outgoing from said layers, wherehy an electrostatically charging of the powder material tales place during the movement of the powder material through said charging ducts after contact -with the inner walls of the ducts, when the sprayer is in 5 e .
. .
~r .
. j:, )3~L
An example of embodiment of the invention will be described in the following, reference being made to the accompanying drawings, in which Fig. 1 is a perspective view of a powder sprayer designed according to the invention, Fig. 2 shows the rear end of the sprayer in partly sectional view, Fig. 3 shows a transportation ~nd charging tube forming part of the sprayer and a conductor connected with this tube, Fig. 4 shows the front end of the sprayer in a partly sectional view, and Figs. 5 and 6 show khe rear end and front end res-pectively of the sprayer in a partly sectional view according to another example of embodiment.
A powder sprayer 1 designed according to the inven-tion is, as mentioned above, especially adapted for use in connec- -tion with powder spraying, the sprayer then preferably being supported and operated by a painting robot. The sprayer- 1 comp-rises substantially three components. A rear component 2 is a connecting component~ which can be coupled together with a hose, in which colouring powder is transported from a colour bin. The colouring powder is transported throuyh a mid component 3 at the same time as it is electrostaticalIy charged, and a front component 4 forms the noz21e of the sprayPr. The mid component 3 comprises a tube 5 preferably made of plastic material. A core of a number of tubes 6 of long extension but of smaller dimension and heli-cally twisted together are enclosed in said tube 5. Also these small tubes 6 are preferably made of plastics or some other non-conducting material. A layer of metal 7 or any other conducting material surrounds each one of these charging tubes 6 r as is evident from Fig. 3. At the rear end of the charging tubes 6, as seen in the direction of transportatiGn, there is a conductor 8 connected to said ~etal layer 7, by way of example by means of a soldered joint 9. These conductors 8 converge and ~lend into a common conductor 10/ which is led through an opening of the outex tube 5 to the outside of the tube and can be grounded or connected to a power source. Each one of the terminal ends of the charging tubes 6 are introduced into a circular core, a rear core 11 and .
.. .
.
3~
a front core 12 respectively. These cores 11, 12 along their periphery exhibit a number of through openings 13/ which are interspaced in a ringshaped arrangement and adapt~d to the respective charging tubes 60 A cone 14 is provided in the centre of the rear core 11 and points in a direction against the direc-tion of ~ransportation, said cone functioning as an atomizer for the powder rushing in. The rear end of the outer tube 5 supports a sleeve 15, which at the one of its ends pointing away from the tube 5 is provided with connections 16 for coupling together the colour sprayer 1 and a hose, in which colouring powder is trans-ported from a colour hopper~ The nozzle 4 is attached to the opposite end of the ~ube. This nozzle component 4 comprises a spray nozzle 17, a connecting tube 18 and a throttle sleeve 19.
The throttle sleeve 19 is with its rear end by means of a coup-ling sleeve 20 connected with the charging tubes 6 and surrounds the front end of the outer tube 5 and exhibits a conically taper-ing through-passage 21 extending in direction away from said tube, in which passage the charged powder is guided towards the central axis of the sprayer 1 and the nozzle 17. The connecting tube 18 is with its rear end introduced into and held by the throttle sleeve 19. A connecting ring 22 is threaded onto the tube 18 at ~
its front end, and said ring 22 in its turn supports said sprayer nozzle 17. The connecting ring 22 i5 traversed by an axial duct 23, which at its reax end is connected with a hose 24 for the supply of gas, by way of example air. rrhe nozzle 17 comprises a sleeve 25, which at its front end supports an end wall 26, which is provided with an opening 27 in central position. This opening 27 exhibits a chamfered edge 27A on its outside and a stepped shoulder 27B on its inside. The front end of a diffuser 28 is fitted into this stepped shoulder 27B, said diffuser exhibit-ing the form of a tube made of porous permeable material trans-mitting the air, by way of example manufactured in a sintering process. The rear end of the diffuser 28 is threaded into the connecting ring 22 and bears against the front end of the connect-ing tube 18. Gas, that is introduced at an overpressure through the duct 23 of the connecting ring, flows into the chamber 29 formed between the nozzle 17 and the diffuser 28, whereafter it is subsequently spread through the small openings existing in the porous material, of which the diffuser is made, before it is ~7~39~
flowing into the front portion of the throug~-duct 30 of the nozzle 4. During this phase an overpressure is created in the front portion of the nozzle, the powder and the gas current being compressed in order to expand and form a mist, when the mixture emerges out of the nozzle 17. By variation of this over-pressure the spreading of the powder can be regulated.
The function of the colour sprayer described above will now be described more in detail. The sprayer 1, as mentioned above, is with its rear end 16 by means of a hose connected with a colour hopper. The colour powder is by means of an air stream transported through the rear portion 2 of the sprayer 1 and by means of the cone 14 spread in outwards direc-tion, so that it flows in through the openings 13 of the core 11 and further in through the charging tubes 6. ~s menti~ned above, these tubes 6 are either connected with the ground or with a power source, by way of example a high tension power source, by means of the conductors 8, 10. On account of the helical form of the charging tu~es 6 the powder whirls around in them during the transportation, and all sides of the particles will arrive in contact with the walls of the tube. When emerging out of these charging tubes 6 the powder is thoroughly charged.
After emerging from these tubes 6 the flow of powder is throttled by the throttling component 19 and is led through the connecting tube 18 to the spreading nozzle 17 through the flow duct 30. As has already been described, the powder is m~ixed with the air flowing in through the duct 24 and the diffuser 28 and is comp-ressed in order to expand when flowing out of the orifice of the nozzle 27, as has been described above. The powder will then be spread in the form of a mist~ and on account of its electrostatic charge it will find a way to the object, which shall be painted, and stick to the same. Also parts of the painting object, which are difficult to reach, will be covered with colour.
The powder sprayer, which is shown in Figs. 5 and 6, is of similar design as the sprayer described above, and such parts as are common for the two examples of embodiment are indi-cated with the same reference numbers.
As distinguished from the earlier described sprayer the sprayer according to Figs. S and 6 is provided with charging ducts 6' of irregular curvature instead of helically curved ducts.
~7~3~
Each duct 6' extends in a number of different planes, as is for example shown in the Figs. 5 and 6.
The function of this powder sprayer is the same as the function of the sprayer described above. The powder~
which is led through the sprayer and its charging ducts 6', will be effectively charged during the movement of the powder through said charging ducts 6' after whirling around and contact-ing the innex walls of said ducts 6'.
The invention is not limited to the embodiments described above and illustrated in the drawings, but can be varied as to its details within the scope of the following claims.
Claims (17)
1.- Powder sprayer with electrostatic charging capacity, comprising a number of charging ducts of long extension and made of electrically non-conducting material, said ducts being coated with electrically-conducting layers along the main portion of their extension and said coated layers being connected to conductor means outgoing from said layers, whereby an electrostatically charging of the powder material takes place during the movement of the powder material through said charging ducts after contact with the inner walls of the ducts, when the sprayer is in use.
2.- Powder sprayer according to claim 1, charac-terized by the fact that the conducting layer is metal, and is provided on the outside of the ducts.
3.- Powder sprayer according to claim 1, charac-terized by the fact that the conductor is connected to said ducts at one end of said ducts located contraflow to the direction of transportation.
4.- Powder sprayer according to claim 3, charac-terized by the fact that each one of the ducts is connected to a conductor and said conductors converge and blend into a common conductor.
5.- Powder sprayer according to claim 1, charac-terized by the fact that the ducts at their respective ends are received and enclosed in a holding core, with the ducts being interspaced in annular arrangement along the peri-phery of said core.
6.- Powder sprayer according to claim 5, charac-terized by the fact that the holding core, which is located at the rear end of the ducts and consequently also at the rear end of the sprayer, in its backwards facing portion has a spreading means located at the central portion of the core.
7.- Powder sprayer according to claim 1, characterized by the fact that the ducts are completely enclosed in a common casing.
8.- Powder sprayer according to claim 1, characterized by the fact that a narrowing portion is located in an area surrounding discharge openings of the ducts.
9.- Powder sprayer according to claim 1, 4 or 6, characterized by the fact that the charging ducts are helically curved.
10.- Powder sprayer according to claim 1, 4 or 6, characterized by the fact that the charging ducts have an irregular curvature.
11.- Powder sprayer according to claim 1, charac-terized by the fact that said charging ducts are made of plastic material.
12.- Powder sprayer according to claim 1 or 11, characterized by the fact that said conductor means are grounded conductors.
13.- Powder sprayer according to claim 6, charac-terized by the fact that said spreading means is in the form of a cone.
14. Powder sprayer according to claim 7, charac-terized by the fact that said common casing is tube-shaped.
15.- Powder sprayer according to claim 8, charac-terized by the fact that said narrowing portion is provided with a cone-shaped part.
16.- Powder sprayer according to chali 4 or 6, characterized by the fact that the ducts are completely enclosed in a common casing.
17.- Powder sprayer according to claim 4 or 6, characterized by the fact that a narrowing portion is located in an area surrounding discharge openings of the ducts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368403A CA1170034A (en) | 1981-01-12 | 1981-01-12 | Powder sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368403A CA1170034A (en) | 1981-01-12 | 1981-01-12 | Powder sprayer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1170034A true CA1170034A (en) | 1984-07-03 |
Family
ID=4118906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368403A Expired CA1170034A (en) | 1981-01-12 | 1981-01-12 | Powder sprayer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1170034A (en) |
-
1981
- 1981-01-12 CA CA000368403A patent/CA1170034A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |