WO2018193066A1

WO2018193066A1 - Spray head for an electrostatic atomizer

Info

Publication number: WO2018193066A1
Application number: PCT/EP2018/060118
Authority: WO
Inventors: Jan Barthelmes; Holger Stohl; Urban Bischofberger; Cyril KUNZ
Original assignee: J. Wagner Gmbh
Priority date: 2017-04-21
Filing date: 2018-04-19
Publication date: 2018-10-25
Also published as: DE102018109453A1

Abstract

Disclosed is a spray head (1) for electrostatic atomizers for liquids, comprising a nozzle field (3) that includes a multitude of atomizer nozzles (4). According to the invention, the nozzle field (3) is in the form of a grid with intersecting grid lines, and atomizer nozzles (4) are arranged in the grid.

Description

"Spray head for an electrostatic atomizer"

The invention relates to a spray head for a

electrostatic atomizer for liquids after

The preamble of claim 1 and an atomizer according to

Claim 15.

Spray heads for electrostatic atomizers for liquids are known in the art. One knows

For example, from US 2010/0116897 AI a

electrostatic atomizer having a spray head comprising linearly arranged atomizing nozzles. Such an arrangement of the atomizer nozzles makes application difficult

for example, a liquid, e.g. the atomizer due to the linear arrangement of the atomizer nozzles

must be moved accordingly, especially when large

Surfaces should be sprayed with a liquid. This is u.a. associated with that of the known atomizer with

reduced efficiency is operable. The object of the invention is to provide a spray head for

To provide electrostatic atomizers for liquids, a particularly simple and efficient, and in particular uniform application or spraying of liquid

allows. To achieve the object, a spray head for electrostatic atomizers for liquids is proposed, which spray head comprises a nozzle array, wherein the nozzle array comprises a plurality of atomizing nozzles made of conductive or non-conductive material.

According to the invention it is provided that the nozzle array is formed as a grid with intersecting grid lines and

Atomizer nozzles are arranged in the grid. In this way, efficient application of the liquid, e.g. be enabled on an object. This application can also

especially evenly. Furthermore, it can be made possible that a surface of an object to be sprayed is freely selectable by flexible arrangements of the atomizer nozzles in a grid. Thus, a spray head can be provided, which can increase the range of applications of a nebulizer.

In a particularly preferred embodiment, the

Invention provide that the spray head comprises a base plate on which the atomizer nozzles are arranged. The use of a base plate can damage the

Atomizer nozzles are avoided. Furthermore you can

different arrangements of the atomizer nozzles on or on the base plate are made possible. Thereby, a spray head can be provided, which is a particularly flexible and

allows efficient atomization of liquids.

In a further advantageous embodiment it can be provided that atomizer nozzles are arranged as grid points in the grid. By targeted arrangement of the atomizer nozzles, a application of a liquid can be simplified, since several, in particular non-linearly arranged atomizer nozzles can enable surface spraying. From this, among other things, a time savings in spraying can be achieved. Cheap electrostatic interactions through different

Arrangements of the atomizer nozzles can also improve or accelerate the spray result. Furthermore, for this purpose, e.g. also an increased spray volume can be provided.

An advantageous embodiment of the invention can provide that atomizer nozzles are arranged on parallel grid lines. This represents another

Possibility to achieve favorable electrostatic interactions by different arrangements of the atomizer nozzles. This can also be a spray result

be improved or a spraying process can be accelerated.

In order to further increase the range of application of the spray nozzle, a further advantageous embodiment of the invention can provide that atomizing nozzles are arranged on grid points and / or grid lines.

A further advantageous embodiment of the invention can provide that grid lines are oriented parallel to one another either in the x direction of the grid or in the y direction

are oriented parallel to each other or oriented in the x-direction and in the y-direction parallel to each other and

Nebulizer nozzles are arranged on grid lines and / or grid points which are oriented in the x direction of the grid and / or in the y direction of the grid. This allows the

Efficiency of spraying a liquid e.g. be increased to an object by particularly flexible or large-scale arrangement of the atomizer nozzles. This can e.g. mean that less time is needed for spraying; the spraying process is thus accelerated. It can also be a cheap one

be achieved electrostatic interaction, whereby less liquid is needed for spraying. Consequently, material savings can be achieved. An advantageous development of the invention can be provided that atomizer nozzles in the grid annular,

are arranged in particular oval-shaped. This allows large-area spraying e.g. an object with a

Liquid. This allows a spraying process to be carried out efficiently, i. be carried out with reduced expenditure of time. Such an arrangement can also be a particularly uniform application of a liquid or a uniform spraying e.g. allow an object with a liquid.

To continue spraying operations efficiently, i. For example, to be able to perform with reduced expenditure of time or to provide a flexible spray head, the invention can also provide that nebulizer in the

Grid are arranged zigzag and / or at least partially parallel to each other.

It is also possible that atomizer nozzles are arranged in the grid at least partially at a right angle to each other. This is another way to increase the efficiency of applying a liquid by means of the spray head. It may be provided in an advantageous embodiment of the invention that the base plate comprises a grid.

Thus, spray nozzles can be arranged on the base plate advantageously so that spraying operations targeted, efficient and high repeatability can be performed.

An embodiment of the invention can provide that the base plate comprises recesses, which are designed in particular as a trench or blind hole, wherein atomizer nozzles

at least partially disposed in the recesses. This allows the atomizer nozzles to be protected from damage. In addition, electrostatic

Interactions of the nebulizer nozzles are positively influenced.

The invention may also provide in a development that the base plate is made of a plastic and the atomizer nozzles protrude from the base plate, preferably reach through this. That way you can

Nebulizer nozzles are secured with sufficient safety and e.g. be protected from damage. Furthermore, insulating properties of plastic can be undesirable

electrostatic interactions of the atomizing nozzles

prevention. As a result, an improved spray result can be achieved.

A further advantageous embodiment of the invention can provide that the nozzle array is formed by at least ten, preferably at least 20 atomizer nozzles. This makes it possible to increase the spray volume.

However, there are also applications, e.g. when spraying sunscreen fluids, conceivable in which just a small number of atomizer nozzles, in particular between 2 and 5 nozzles is to be regarded as advantageous. This is e.g. the case when the liquid to be sprayed too close

Nozzle arrangement occurs in significant interaction of the votes of the nozzles spraying. To avoid unwanted electrostatic interactions

To minimize nebulizer, can be provided in an advantageous development within the scope of the invention that nebulizer nozzles at a distance from each other from 5 mm to 15 mm, preferably from 8 to 13 mm, particularly preferably 10 mm are arranged.

In the alternative application case described above, e.g. the spraying of sunscreen fluids, is an elevated

Nozzle distance required. In particular, distances between 40mm and 45mm are advantageous in order to adjust the interaction functional and functional. The invention may also provide that atomizing nozzles are formed as a one-piece assembly. Such

Assembly is e.g. easy to replace or retrofit.

The invention further relates to an electrostatic atomizer for liquids, in particular cosmetics, wherein the atomizer at least one housing, an electrical

Energy source, an activating agent, a

Control electronics, a high voltage source, a

Liquid tank, a conveyor and a

Spray head according to the invention comprises.

For the purposes of the invention, an electro-hydrodynamic atomization can also be understood to mean electrostatic atomization. For the purposes of the invention, a grid may also be used as an arrangement of a plurality of columns arranged next to each other

be understood among themselves arranged lines.

For the purposes of the invention, any liquid is to be understood as meaning a liquid. For the purposes of the invention, it is provided in particular that the liquid is a cosmetic. The

Liquid may also be a liquid paint or varnish or the like. Further developments according to the invention will become apparent from the following description taken in conjunction with the claims and the drawings. The invention will be described in more detail below with reference to a preferred embodiment. It shows :

Figure 1: a schematic representation of a

spray head according to the invention; Figure 2: another highly simplified schematic

Representation of a spray head according to the invention

FIG. 3 shows a schematic representation of an atomizer with a spray head according to the invention;

Figure 4: a greatly simplified representation of a

Section of a further embodiment of a spray head according to the invention; FIG. 5a: a greatly simplified schematic sectional view

Representation of a further embodiment of a spray head according to the invention;

FIG. 5b: another simplified schematic

Sectional view of a further embodiment of a spray head according to the invention.

FIG. 1 shows a schematic illustration of a spray head 1 according to the invention. The spray head 1 comprises a nozzle field 3, wherein the nozzle field 3 a plurality of

Nebulizer nozzles 4 comprises. To use the spray head 1 for an electrostatic atomizer (see Figure 3), the atomizing nozzles 4 are made of conductive material. Of the Spray head 1 further comprises a base plate 8, which in the present case is made of a plastic.

In the exemplary embodiment according to FIG. 1 atomizing nozzles 4 are arranged in an oval shape on or on the base plate 8. It is further shown that atomizing nozzles 4 from the

Stand out base plate 8 and reach through the base plate 8. From Figure 2 it can be seen that the nozzle array 3 as

Grating 5 is formed with intersecting grid lines 6 and that atomizer nozzles 4 are arranged in the grid 5. The nozzle array 3 comprises lattice points 7, which in themselves

intersecting grid lines 6 are arranged.

For simplified illustration or explanation is a

Coordinate system drawn, which shows an x-direction 10 of the grating 5 and a y-direction 11 of the grating 5. FIG. 4 shows an arrangement of atomizing nozzles 4

shown, wherein the atomizer nozzles 4 along the

indicated arrow direction 13 are displaceable. Shown here is that the atomizer nozzles through a housing 12, e.g. an atomizer (see, for example, FIG.

are displaceable. This can also be understood that the nozzle array along the direction of arrow 13 is displaced.

The atomizer nozzles shown in FIG. 4 are conically tapered. This allows a particularly clean spraying of a liquid or a clean application of a liquid.

In the embodiment shown in FIG 4 form

Atomizing nozzles 4 and base plate 8 a one-piece Assembly. In this way, a simple exchange of the nozzle array 3 can be made possible.

FIGS. 5a and 5b show that atomizer nozzles 4 can be in recesses 9 of the base plate 8. It can be provided that the recess 9 as a trench (see Figure 5a) is formed, wherein the recess in the

Base plate 8 is disposed continuously circumferentially. It may also be possible according to FIG. 5 b that recesses 9 are formed in the base plate 8 as blind holes in which atomizer nozzles 4 are arranged. In this case, electrostatic interactions of adjacent atomizer nozzles can be influenced by insulating arrangements of the atomizer nozzles 4.

For the sake of simplicity, only one recess 9 is shown in FIG. 5b. It is intended that the

Base plate 8 comprises a plurality of spray nozzles 4 and also includes a plurality of recesses 9.

It is envisaged that an atomizer (see Figure 3) with a spray head according to the invention for spraying a

Liquid can achieve flow rates that can be about 10 mL / min.

Since the electrohydrodynamic spray volume of a single spray nozzle is limited, especially if the

Atomiser nozzle tapered, i. is conically tapered, it is necessary to achieve flow rates of about 10 mL / min, the number of atomizing nozzles to multiply. It is particularly advantageous in this case if a nozzle field is provided which comprises about 20 atomizer nozzles. By a correspondingly favorable arrangement of

Atomizing nozzles can spray the atomizer nozzles due to the repulsion of the same charges in their effect mutually support.

train sign list:

spray nozzle

atomizer

nozzle array

atomizer

grid

gridlines

grid points

baseplate

Recesses x-direction y-direction

casing

arrow

Claims

Claims :

A spray head (1) for electrostatic atomizers (2) for liquids, comprising a nozzle array (3), wherein the

Nozzle array (3) comprises a plurality of atomizing nozzles (4) made of conductive material, characterized in that the nozzle array (3) as a grid (5) with each other crossing

Grid lines (6) is formed and atomizer nozzles (4) in the grid (5) are arranged.

2. spray head (1) for electrostatic atomizers (2) for liquids, comprising a nozzle array (3), wherein the

Nozzle array (3) comprises a plurality of atomizer nozzles (4) made of non-conductive material, characterized in that the nozzle array (3) as a grid (5) with each other

Grid lines (6) is formed and atomizer nozzles (4) in the grid (5) are arranged.

3. Spray head according to claim 1 or 2, characterized in that the spray head (1) comprises a base plate (8) are arranged on the atomizer nozzles (4).

4. Spray head according to one of the preceding claims, characterized in that atomizer nozzles (4) on grid points (7) and / or grid lines (6) are arranged.

5. Spray head according to one of the preceding claims, characterized in that atomizer nozzles (4) are arranged on mutually parallel grid lines (6).

6. Spray head according to one of the preceding claims, characterized in that grid lines (6) either

- Are oriented parallel to each other in the x-direction (10) of the grid (5) or

- Are oriented in the y-direction (11) parallel to each other or - in the x-direction (10) and in the y-direction (11) in parallel

oriented to each other

and

- Atomizer nozzles (4) on grid lines (6) and / or

Grid points (7) are arranged, which are oriented in the x-direction (10) of the grid (5) and / or in the y-direction (11) of the grid (5).

7. Spray head according to one of the preceding claims, characterized in that atomizing nozzles (4) in the grid (5) are arranged annularly, in particular oval or that atomizer nozzles (4) in the grid (5) arranged zigzag and / or at least partially parallel to each other are.

8. Spray head according to one of the preceding claims, characterized in that atomizer nozzles (4) in the grid (5) are at least partially arranged at a right angle to each other.

9. Spray head according to one of the preceding claims, characterized in that the base plate (8) comprises a grid (5).

10. Spray head according to one of the preceding claims, characterized in that the base plate (8) recesses (9), which are designed in particular as a trench or blind hole, wherein atomizer nozzles are at least partially disposed in the recesses (9).

11. Spray head according to one of the preceding claims, characterized in that the base plate (8) is made of a plastic and the atomizer nozzles (4) protrude from the base plate (8), preferably through this

reach through.

12. Spray head according to one of the preceding claims, characterized in that the nozzle array (3) of at least ten, preferably of at least 20 atomizer nozzles (4) is formed.

13. Spray head according to one of the preceding claims 1 to 11, characterized in that the nozzle field (3) of

at least 2, preferably of at most 10 atomizer nozzles (4) is formed.

14. Spray head according to one of the preceding claims, characterized in that atomizer nozzles (4) are arranged at a distance from each other of 5 mm to 15 mm, preferably from 8 to 13 mm, particularly preferably of 10 mm.

15. Spray head according to one of the preceding claims 1 to 13, characterized in that atomizing nozzles (4) are arranged at a distance from each other of 30 mm to 50 mm, preferably from 40mm to 45 mm, more preferably of about 42mm.

16. Spray head according to one of the preceding claims, characterized in that atomizer nozzles (4) are formed as a one-piece assembly.

17. Electrostatic sprayer (2) for liquids, in particular cosmetics,

wherein the atomizer (2) at least

a housing (12),

an electrical energy source,

an activating agent,

- a control electronics,

a high voltage source,

a liquid tank,

a conveyor and

comprises a spray head (1),

characterized in that

the spray head (1) according to one of claims 1 to 16 is formed.