ES2331374T3 - CLEANING AGENT ECONOMIZING ROTATING SPRAYER. - Google Patents

Abstract

Rotational sprayer has a symmetrical bell-shaped body (1) with nose part (2), cover part (3) with divergent surface (8) and steering gas ring (7) with at least one steering gas nozzle (13,13'). The divergent cover has a shoulder (11) between nose and cover part, which extends ring-like around the nose part and denotes an angle of at least 90[deg] of the exterior surface to the spray device. The nozzle is arranged so that its spray (14) hits the cover part inside the shoulder.

Description

Agent economizer rotary sprayer cleaning.

The invention relates to a sprayer rotary that presents the characteristics of the preamble of the claim 1. A rotary sprayer of this class can be use for example for automatic body painting of automobile in series industrial production of automobiles.

This class of rotary sprayers feature generally a rotating bell-shaped body that has a part of bushing to connect to a drive motor and a part envelope to spray the coating material. The engine of drive is for example a compressed air motor by means of the which the bell-shaped body is rotated at very high speed (several 10,000 revolutions per minute). Centrifugal forces that occur in this way act on the material of liquid coating that is about to spray and accelerate it in the part of the envelope in the direction of an edge of spray detachment where you leave the bell-shaped body in shape of a mist of very fine droplets (called abbreviated: Spray), is dragged by a gas stream and is accelerates in the form of an atomized jet in the direction of a substrate that is to be coated.

In this class of rotary sprayers you can arise the problem that some parts of the material of coating undesirably deposited on the surface outside of the surrounding part of the bell-shaped body, by example due to splashes or rebound splashes. These deposits or waste can be detached from the surrounding part during subsequent coating processes damaging the coating quality This problem is especially evident when the coating material is an enamel of a certain color, and during the coating process subsequent enamel of another color is used. Yes for a subsequent coating process debris from a previous coating process, then the enamel applied on second place may contain particles of the first enamel, of another color. A substrate coated in this way may result useless.

This problem is already known by the state of the art. From European Patent EP 0 715 896 B1, for example, a rotary sprayer with a bell-shaped body is deduced into which a cleaning agent can be conducted through special holes and ducts located inside the bell-shaped body, on the lateral surface outside of it, so that between two coating processes a cleaning can be carried out. The cleaning agent is propelled through the holes or channels by centrifugal force due to the rotation of the bell-shaped body. In this way it reaches a U-shaped annular space that is located on the outer surface of the bell-shaped body in the zone of the transition between the part of the bushing and the surrounding part, and that surrounds the part of the bushing in the form of a ring. The mouth of the U of the U-shaped annular space is then removed from the inner space of the bell-shaped body. Due to the centrifugal force, the cleaning agent flows over the outer edge that radially limits the annular space by passing to the outer surface of the bell-shaped body shell, and is distributed thereon. The rotary sprayer also has crowns of air nozzles whose jets impact the
Enveloping part of the hood body outside the U-shaped annular space. The rotary sprayer has a relatively complex construction. In addition, there is a danger that coating material will be deposited in the U-shaped annular space, so that a relatively large amount of cleaning agent must be used to obtain a satisfactory cleaning result, which negatively influences costs of operation.

It is understood under the concept of "result of cleaning "the complete disposal of material waste from coating on the outer surface of the envelope of the bell-shaped body. The less material waste from annoying coating remain on the outer face of the Wraparound surface after a cleaning process, both Better is the result of cleaning.

From US 6,341,734 B1 another bell-shaped rotary sprayer is known. The outer surface of the housing part of the bell-shaped body does not have any kind of recesses, such as, for example, the U-shaped annular space mentioned above, where coating material could be deposited. In the bell-shaped body, holes or conduits are provided for a cleaning agent that flow into the transition zone between the bushing part and the enclosure part, directly on the outer surface of the enclosure part. In the area of the mouths, the enveloping surface has a flattened shoulder area. In addition, gas nozzles are provided.
director whose jets strike the surrounding part outside the shoulder area, radially distanced from the mouths. The rotary sprayer has a simpler design, but the distribution of the cleaning agent on the outer surface of the housing part of the bell-shaped body is however unsatisfactory, so it is
A relatively large amount of cleaning agent must be used to obtain a good cleaning result.

From EP 0 463 742 A2 a known rotary sprayer with a bell-shaped body with symmetry of rotation in which air is conducted in essentially direction parallel to an enveloping surface of the bell-shaped body from Several gas nozzles director. Nozzles are also provided. additional ones that are oriented approximately radially against an essentially cylindrical bushing area. A cleaning channel is directed over a divergent area of the campaniform body.

From US 5,914,153 a known rotary sprayer with a bell-shaped body that does not need gas jet director. To clean the hood is planned spray a sprayed liquid from spray nozzles directed against the bell's surround surface.

It is also known by JP 06218301 A a rotary sprayer in which several jets of gas are directed on a bell surround surface.

With this background, the objective of the present invention was to create a rotary sprayer that featured  a simple design and in which for surface cleaning outside of the enveloping part of its bell-shaped body is had to use a reduced amount of cleaning agent to achieve a good cleaning result.

The aforementioned objective is solved by object defined in the main claim. Some forms of Preferred embodiments are defined in the claims. subordinates

The object of the present invention is therefore a rotary sprayer with a bell-shaped body with rotational symmetry that has a bushing part for joining with a drive motor, as well as with a wrapping part for spraying a coating material in the form of a spray, the spray direction being parallel to the axis of rotation, and also with a director gas ring arranged around the part of the bushing, symmetrically to the axis of rotation, and having several director gas nozzles oriented in the direction of spray that form at least one crown of nozzles to form the spray, the wrapping part having a divergent outer surface extending from the transition between the bushing part and the wrapping part to a spray edge of the wrapping part, in addition with at least one outer cleaning channel to conduct the cleaning agent on the divergent outer surface. According to the invention, the divergent outer surface exhibits in the transition in the part of the bushing and the surrounding part a shoulder area that extends annularly around the bushing part, and in which the tangents to the outer surface they form a maximum angle of 90º with the spray direction. For this, the nozzles of the gas director are arranged in such a way that their jet affects the surrounding part within the area of the
shoulder.

To do this the at least one conduit of exterior cleaning flows into the at least one crown of nozzles In this way the cleaning agent can be distributed during a cleaning process thanks to the gas stream director on the outer surface of the surrounding part. And it is that within the framework of the present invention it has been seen that of this way a remarkably uniform distribution can be achieved of the cleaning agent, so just use an amount reduced cleaning agent to achieve a good result of cleaning. It also opens the possibility of carrying out a process cleaning with good cleaning result and reduced consumption of cleaning agent, also in a stationary state, that is, without being turning the bell-shaped body for it, especially if it is planned more than one gas nozzle director. In addition the possibility of cleaning the gas nozzles director with the agent of cleaning, since in unfavorable circumstances the material of coating can splash back to the air nozzles director, depositing there annoyingly.

The spray direction does not reproduce the flight path of the different droplets of the spray but the direction of the spray jet or cone assembly sprayed

As a coating material it is considered especially enamel.

The direct gas is preferably used air, since air represents the cheapest gas and that of Availability and easier handling. However, it also fits imagine the use of other gases as a gas director, as per example an inert gas or protective gas if it is necessary to spray coating materials that are sensitive to air.

The concept of "cleaning agent" encompasses also within the framework of the present invention solvents, detergents and other liquid media that are suitable for removing with them the waste of coating material.

According to the invention, the jet coming from the gas nozzle director affects the part envelope inside the shoulder area. Since a jet so general does not have a defined extension in one hundred percent, there are non-important parts of the jet that are located in the area of the edge of it, can affect the surrounding part also involuntarily outside the shoulder areas. The important is that the center and the essential parts of the jet affect the enveloping part inside the shoulder areas.

The rotary sprayer according to the invention With bell-shaped body it presents a simple structure. Thank you to the jet of the gas nozzles director that affects the part envelope in the shoulder area produces a jet of gas director especially concentrated and well applied on the outer surface of the enveloping part, which together with the rotation results in a spray jet especially well oriented and concentrated in the spray direction. How consequence of this very few or even none occur coating material splash or recoil splash that are annoyingly deposited on the outer surface of the surrounding part and have to be removed by Cleaning and cleaning agent application. In addition, the agent of cleaning employee is distributed evenly over the surface exterior that is about cleaning thanks to the improved flow Gas director. Both things result in saving cleaning agent for cleaning the exterior surfaces of the enveloping part of the bell-shaped body without therefore worsen the cleaning result. Thanks to the spray atomized well oriented and concentrated also produces very few splashes exterior, so you can save coating material and It improves the result of the paint. Thanks to the simple structure Production costs for the rotary sprayer according to The invention are relatively small.

In one embodiment of the rotary sprayer According to the invention, the master gas ring has less a crown of nozzles, at least the crown nozzles of nozzles having the shortest distance radial to the bushing so that its jet hits the part envelope inside the shoulder area. For this the nozzles of Gas director are preferably arranged distributed equidistant over a radius around the bushing part. Of this mode, you can generate a gas jet director even better with a reasonable complexity of the device, and therefore still occur less waste of coating material that have to be eliminated with an expense of cleaning agent, and consequently produces an even more uniform cleaning agent distribution and Therefore saving cleaning agent.

In a refinement of the gas ring This director also presents another crown of external nozzles, whose  nozzles are located at a greater radial distance from the bushing that the nozzles of the inner nozzle crown and whose jet It affects the surrounding part outside the shoulder area. From this mode can generate an atomizer jet even more concentrated.

In another refinement, the gas ring director is done forming a single piece with the body bell-shaped In this way the radial distance between the gas nozzles director and the bushing part, so no there can be any mismatch. For this reason you can avoid a worsening of the gas stream director because of a mismatch, so that a uniform quality of the coating result, a uniformly reduced amount of waste of coating material and distribution equally Good cleaning agent.

In one embodiment of the rotary sprayer according to the invention the tangents with the outer surface in the shoulder area encloses an angle with the spray direction from 70 to 90º. A shoulder area made in this way favors combination with the rotation and / or with the director gas jet a uniform distribution of cleaning agent on the surface outside of the surrounding part of the bell-shaped body and contributes  thereby improving cleaning results as well as saving cleaning agent.

In another embodiment of the rotary sprayer according to the invention the outer surface of the part envelope is made in the form of a bell. This is a way convenient under hydrodynamic appearance, which favors the formation of a well-attached director gas stream for distribution Optimum cleaning agent on the surrounding part, and with it It helps reduce the needs of cleaning agent.

In a perfecting the bell-shaped body It is made in such a way that after the shoulder area follows an outwardly domed area relative to the axis of rotation. This geometric shape has turned out to be especially convenient under the hydrodynamic aspect, to give rise to a Gas jet director well attached.

The bell-shaped body may also present, at least partially and preferably in the surface area exterior, a coating with a non-stick material. In this case the non-stick material ensures that there is a low adhesion of splashes of coating material or recoil splashes, so you have to spend an amount less or even no cleaning agent to remove waste of coating material. In this case, the splashes or splashes of recoil of the material coating adhere poorly or do not adhere at all on the campaniform body, but during the same process of coating is almost completely removed, eg due to centrifugal forces due to rotation. If the body campaniforme presents a non-stick coating of this kind a smaller number of channels can be provided eventually exterior cleaning If no cleaning agent is required for remove splashes or splashes of recoil of material from coating because they drain out, for example, then eventually you can even totally give up the channels of exterior cleaning

The non-stick material can be a compound containing nanoparticles. The use of nanoparticles has the advantage that you can create surfaces with properties made to the measure, in particular with an especially small amount of free energy, in which there are especially few attached splashes of coating material or splashes of recoil, so for its elimination an amount is needed especially reduced cleaning agent.

Non-stick materials can be purchased suitable for example in the Company NANO-X GMBH, among others in the form of a coating material that confer the surface treated with them the so-called properties "easy-to-clean" clean) and non-stick, and as additives for materials coating, enamels and paints. A non-stick material suitable for this company is for example the x-clean® EC 4008.

In a preferred embodiment of the sprayer rotary according to the invention the at least one channel of exterior cleaning flows into the exterior surface in the transition between the bushing part and the enveloping part. This has especially advantageous result with a view to a distribution what as uniform as possible of cleaning agent on the surface outer part of the envelope.

It is also preferred that they are provided by At least two exterior cleaning channels. This way you can apply on the outer surface of the surrounding part the cleaning agent evenly distributed evenly, before it continues to be distributed there, without increasing excessively the construction expense for the sprayer rotary.

In a also preferred embodiment of the Rotary sprayer according to the invention are provided by at least two exterior cleaning channels, of which at least minus a first leads to the transition between the bushing part and the enveloping part on the outer surface, and at least a second flows into at least one crown of nozzles. Of this mode you can combine the advantages of the two previously disclosed embodiments.

In an improvement they are planned minus two first exterior cleaning channels. In this way you can apply on the outer surface of the surrounding part the cleaning agent distributed already in some uniform way, before to continue distributing there, without increasing excessively the construction expense for the sprayer rotary.

In a variant of the rotary sprayer according to the invention the spray detachment edge at least one director element for the material of covering. In this way the formation of drops of especially small coating material. And it has been since the risk of splashes or splashes of recoil of Coating material is so much smaller, how much smaller are the droplets of coating material. The lower the droplets of coating material so much less is the number of splashes or splashes of recoil of material coating to be removed by spending agent cleaning.

The at least one conductive element can be made in the form of grooves, which is technically especially easy to perform, for example milling channels. The grooves can also be oriented radially in relation to to the axis of rotation, inclined in the direction of rotation or in opposite direction, such as cross grooves or similar. Due to the grooves the coating material is directed towards the exterior on the edge of detachment. In this way the material of coating is cleanly attached to the inner surface of the enveloping part and leaves the edge of detachment of a Exactly defined mode as a channeled droplet stream. This avoid turbulence in the edge of detachment that could give place to splashes or splashes of recoil of the material of covering.

The invention is described in greater detail in then using some concrete examples of realization represented in simplified form in the Figures, as well as with the corresponding description. The figures show:

Fig. 1 a detail of an embodiment of a generic rotary sprayer;

Fig. 2 a detail of an embodiment of a rotary sprayer according to the invention;

Fig. 3 a bell-shaped body of a sprayer rotating according to the invention with a directing element;

Fig. 4 spray jets (a) of a rotary sprayer according to the invention; (b) of a conventional rotary sprayer.

Fig. 1 shows an embodiment of a generic rotary sprayer. It is schematically represented a detail of a section through a rotary sprayer generic. The rotary sprayer has a bell-shaped body (1) with rotation symmetry, with a bushing part (2) to join with a drive motor (not shown), a part envelope (3) for spraying a coating material in the form of a spray, and a transition (4) between the bushing part (2) and the enveloping part (3). The axis of rotation has also been indicated (5). The spray direction is represented by the arrow (6). The envelope part (3) has an outer surface (8) that diverges in the spray direction (6), and that extends from the transition (4) of the bushing part (2) through the enclosure part (3) to the spray detachment edge (9). On outer surface (8) a material may be applied non-stick (not shown).

The bell-shaped body (1) has a channel of exterior cleaning (10) through which you can drive a cleaning agent from a rush (not shown) located in the inside of the bushing part (2) on the outer surface (8). The exterior cleaning channel (10) leads to the transition (4) of the outer surface (8). A single channel is represented exterior cleaning (10); however the rotary sprayer It can have two or more exterior cleaning channels (10).

In the transition (4) between the bushing part (2) and the enveloping part (3) the bell-shaped body (1) has a shoulder area (11) in which the tangents (12) to the surface outside (8) enclose with the spray direction (6), which is parallel to the axis of rotation (5), an angle α of about 85 °. The shoulder area (11) extends annularly around the bushing part (2).

The conductive gas ring (7) is made essentially with rotation symmetry, having as axis of symmetry the axis of rotation (5). It has two nozzle crowns that They consist of forty interior director gas nozzles (13) (inner crown of nozzles) and forty gas nozzles director outer (13) (outer crown of nozzles), where the nozzles of Gas director (13, 13 ') of the same crown of nozzles are arranged equidistant distributed over the same radius. By reasons of clarity however they have only been represented four director gas nozzles, of which only two are designated (13, 13 '). The gas nozzles director (13, 13 ') are oriented in the direction of spray detachment (6) for spray the sprayed coating material. For this the director gas nozzles (13) of the inner nozzle crown are arranged in such a way that its jet (14) hits the part envelope (3) in the shoulder area (11). The jets (14 ') of the director gas nozzles (13 ') of the outer nozzle crown they affect the surrounding part (3) outside the shoulder area (eleven). For clarity only two jets have been represented (14, 14 ') representing all the jets of the nozzles of gas director (13, 13 ').

The outer surface (8) is made with flared shape. Next to the shoulder area (11) there is a area in which the enveloping part (3) is bulged towards the outside relative to the axis of rotation (5). Then follow another area in which the enveloping part (3) widens so outward conical.

Other details of a rotary sprayer Know the technician in principle. For that reason they have not Represented for reasons of clarity.

Fig. 2 shows an embodiment of the present invention A detail is schematically represented of a section through a rotary sprayer according to the invention. The rotary sprayer has a similar structure to that of the rotary sprayer of Fig. 1, but it presents the following differences: the flared body (1) and the gas ring Director (7) are made in one piece; are planned external cleaning channels (10, 10 ') that flow into the crown of internal nozzles or in the director gas nozzles interiors (13), so that the cleaning agent can be driven from a supply pipe (not shown) to the interior of the part of the bushing (2) to the director gas nozzles (13), from where it is applied on the outer surface (8) with the help of the current of gas director, and can be distributed there evenly. Is it so represented only two exterior cleaning channels (10, 10 ') but the rotary sprayer may have a greater number of exterior cleaning channels. Other channels are not represented exterior cleaning that flows into the exterior surface (8) in the transition (4) between the bushing part (2) and the part envelope, as they may be provided in another form of embodiment of the present invention.

Fig. 3 shows the rotary sprayer of the Fig. 1 that to favor the formation of droplets especially Small coating material presents a directing element (15) for the coating material. The director element is located along the spray detachment edge (9) and it is made in the form of longitudinal grooves (16) that go milled in the spray detachment edge (9). Of the longitudinal grooves (16) have been represented seventeen, but by reasons of clarity only one of them carries a reference, in representation of all of them.

Fig. 4 shows a comparison between simulated flight paths of material droplets coating, in (a) a rotary sprayer according to the invention and (b) a rotary sprayer not in accordance with the invention, according to the state of the art. It is clearly observed that the director air stream from the director gas (7) goes closely attached to the flared body (1) in the case of rotary sprayer according to the invention (a), and which by this motive forms a clean, well-oriented atomized jet and concentrate (18), where you have to fear only very few residues of coating material such as splashes or recoil splashes. On the other hand in the case of the sprayer rotary (b) that is not according to the invention, the air jet director is not clean but an atomized jet is formed diffuse (18) in which numerous material residues have to be feared of coating to be removed with solvent expense, in particular from the secondary jet (17).

The comparison shows therefore that in the rotary sprayer of simple design according to the invention must be used for cleaning the exterior surface (8) only a small amount of cleaning agent, to achieve a good cleaning result.

Reference List

one

Flared body

2

Bushing part

3

Envelope part

4

Transition between the bushing part and the part envelope

5

Axis of rotation

6

Spray direction

7

Gas ring director

8

Outside surface of the part envelope

9

Spray Release Edge

10, 10 '

Exterior cleaning channels

eleven

Shoulder area

12

Tangent

13, 13 '

Gas nozzles director

14, 14 '

Jets

fifteen

Director element

16

Longitudinal groove

17

Secondary jet

18

Atomized jet

Claims (16)

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1. Rotary sprayer with a bell-shaped body (1) with rotational symmetry that has a bushing part (2) for joining with a drive motor as well as a wrapping part (3) for spraying a coating material in the form of a spray , the spray direction being parallel to the axis of rotation (5), and also with a ring of director gas (7) arranged around the part of the bushing (2), symmetrically to the axis of rotation (5), and that It has several director gas nozzles (13, 13 ') oriented in the spray direction, which form at least one crown of nozzles to form the spray, the envelope (3) presenting a divergent outer surface, in addition to at least an exterior cleaning channel (10, 10 ') for conducting a cleaning agent on the divergent outer surface, the divergent outer surface presenting in the transition between the bushing part (2) and the enveloping part (3) a shoulder area (11) that extends in form to be annulled around the part of the bushing, and in which the tangents to the outer surface close with the spray direction (6) a maximum angle of 90 °, the director gas nozzles (13, 13 ') being arranged in such a way that its jet strikes the enveloping part within the shoulder area (11), characterized in that the divergent outer surface extends in the transition between the part of the bushing (2) and the enveloping part (3) to a detachment edge of sprayed (9) of the enclosure, the at least one outer cleaning channel (10, 10 ') flowing into the at least one crown of nozzles. 2. Rotary sprayer according to claim 1, characterized in that at least the nozzles of the nozzle crown are arranged with the minimum radial distance possible with respect to the bushing (2) such that its jet strikes the enclosure part (3) inside from the shoulder area (11). 3. Rotary sprayer according to claim 2, characterized in that the master gas ring (7) has at least one other outer nozzle crown whose nozzles have a radial distance from the hub (2) greater than the nozzles of the inner nozzle crown , with its jet affecting the surrounding part (3) outside the area of the
shoulder (11). 4. Rotary sprayer according to one of claims 1 to 3, characterized in that the master gas ring (7) is formed in one piece with the bell-shaped body (1). 5. Rotary sprayer according to one of claims 1 to 4, characterized in that the tangents to the outer surface in the shoulder area (11) enclose with the spray direction an angle of 70 to 90 °. 6. Rotary sprayer according to one of claims 1 to 5, characterized in that the outer surface of the housing part (3) is bell-shaped. 7. Rotary sprayer according to one of claims 1 to 6, characterized in that with the shoulder area (11) it limits an area pumped outwards in relation to the axis of rotation (5). 8. Rotary sprayer according to one of claims 1 to 7, characterized in that the bell-shaped body (1) has at least partially a coating with a non-stick product. 9. Rotary sprayer according to claim 8, characterized in that the non-stick product is a composition containing nanoparticles. 10. Rotary sprayer according to one of claims 1 to 9, characterized in that the at least one outer cleaning channel (10, 10 ') flows into the outer surface in the transition in the part of the bushing (2) and the surrounding part (3). 11. Rotary sprayer according to claim 10, characterized in that at least two external cleaning channels (10, 10 ') are provided. 12. Rotary sprayer according to one of claims 1 to 9, characterized in that at least two exterior cleaning channels (10, 10 ') are provided, of which at least one first leads to the transition between the part of the bushing (2 ) and the enveloping part (3) on the outer surface and at least one second in at least one nozzle crown. 13. Rotary sprayer according to claim 12, characterized in that at least two first exterior cleaning channels are provided. 14. Rotary sprayer according to one of claims 1 to 13, characterized in that the spray detachment edge (9) has at least one directing element for the coating material. 15. Rotary sprayer according to claim 14, characterized in that at least one of the director elements (15) is made as a groove. 16. Rotary sprayer according to claim 15, characterized in that the grooves are radially oriented relative to the axis of rotation, are inclined in the direction of rotation or against the direction of rotation or are made as cross grooves.