Dusting device

Abstract

Dusting device (1) for applying dust to surfaces via an air path, comprising a disperser (3, 5, 6) for dispensing a stream of air-dispersed powder (2), wherein a dispensing opening (8) of the disperser (3, 5, 6) is arranged in an intake area of ​​a water-fed mist generator (13, 14, 15, 16, 17), characterized in that the mist generator is surrounded by a casing tube (11), the axis of which is arranged concentrically to the jet axis of the mist jet generated by the mist generator, wherein the mist generator has several pressurized water-fed ejectors (15) which are arranged to rotate about the jet axis and are driven in rotation, and which each generate a water jet (18) parallel or slightly inclined to and rotating around the jet axis, wherein the slight inclination of the ejectors (15) causes the rotating drive is reachable.

Description

[0001] The invention relates to a dusting device of the type mentioned in the preamble of claim 1.

[0002] Dusting devices of this type are shown, for example, on the website http: / / www.bega.de / staub.htm. They are designed to disperse powder from a reservoir into an airflow and then discharge the resulting dust stream. Such devices are available in portable form, such as backpacks, and are used for various purposes, including dusting interior building surfaces with disinfectants, dusting plants with pesticides or fertilizers, and similar applications.

[0003] With known dusting devices, dry operation is necessary to avoid the risk of clumping. However, this also produces very dry dust that can easily fall from surfaces or be blown away by the wind, for example. Therefore, applying dust to a surface is unsafe according to the current state of the art.

[0004] The farmer knows, however, that powders, such as pesticides, are best applied with a duster when the plants have damp surfaces, for example, from morning dew. The dust then settles on the damp surfaces and is dissolved there, resulting in strong adhesion and rapid chemical action. However, this method is only applicable under certain meteorological conditions.

[0005] Another disadvantage of the known dusting devices is the difficulty in steering the dry dust jet, which is carried along by even a light wind and is also very limited in its range.

[0006] Attempts to first dissolve the powder in water and then spray it in suspended or dissolved form proved unsatisfactory. Clumping and abrasion problems, particularly at the nozzles, ultimately proved too difficult to control.

[0007] The object of the present invention is therefore to improve a dusting device of the type mentioned above with regard to the problems mentioned.

[0008] This problem is solved by the features of the marking part of claim 1.

[0009] The invention provides for a mist generator behind the dust-generating disperser, which atomizes water in a controlled manner. Air is drawn in from an intake area where the disperser's outlet is located. The mist generator thus draws in dust and emits a mist mixed with dust, which is directed onto the surfaces to be dusted. This ensures good dust adhesion regardless of weather conditions and utilizes the mist generator's long range. Furthermore, applying dust that is already partially dissolved in water offers the advantage of faster and more effective action of the chemical agents.

[0010] According to the invention, the fog jet generator has several ejectors supplied with pressurized water, which generate a water jet parallel or slightly inclined to and rotating around the jet axis, forming a structure as described in DE 103 37 963 B3. The rotating water jet creates a good turbulence of fog and dust, so that each dust particle encounters a fog droplet and arrives at the surface already bound to water. Losses due to dust carried away by wind currents are thus avoided, and all the dust arrives where the precisely directional fog jet strikes.

[0011] According to the invention, the effect of the fog jet generator is improved by surrounding the fog jet generator with a casing tube concentric to the jet axis. The casing tube improves the directional effect and, in particular, the range of the fog jet.

[0012] The outer casing can be closed on the intake side, but is advantageous to increase the jet effect on the intake side.

[0013] The air and water flow rate of the litter humidification system can advantageously be designed to be separately controllable according to claim 3, thereby making the ratio of dust to water adjustable.

[0014] The drawing shows in a single Fig. 1 a partially cutaway view of a dusting device according to the invention.

[0015] Fig.Figure 1 shows a dusting device 1 with a container 3 containing a powder 2 to be dusted, e.g., a pesticide. The container has a bottom outlet 4 in which a discharge roller 5 is arranged. This roller pulverizes and meteres the powder 2 into an air tube 6. The air tube 6 draws in air from an inlet 7 in the direction of the arrow and generates a dust stream, which is blown out at a discharge opening 8 in the direction of the arrow. If necessary, a blower 9, shown with dashed lines, can be provided to assist the air stream.

[0016] The device described so far forms a disperser 3, 5, 6 which disperses powder 2 from a supply into an air stream in the tube 6 and discharges it at the dispensing opening 8.

[0017] The discharge opening 8 is arranged with struts 10 in the axis of a casing tube 11, which generates a mist jet in the direction of the axis of the casing tube.

[0018] A further strut 12 rotatably holds a rotor 13, which carries ejectors 15 on arms 14 oriented parallel to the axis of the casing tube 11. These are connected via the arms 14 and the struts 12 to a line 17 supplying water under the pressure of a pump 16.

[0019] If the pump 16 delivers water under pressure to the ejectors 15 and the rotor 13 is driven to rotate, which can be achieved, for example, by slightly tilting the ejectors 15, the jets shown in dashed lines result in the form of a highly turbulent, very well-directed jet in the axis of the casing tube 11.

[0020] This mist jet 18 has a considerable suction effect which can be sufficient to generate a flow in the air tube 6 sufficient for the function of the disperser 3, 5, 6, if an additional blower 9 is to be dispensed with.

[0021] The illustrated dusting device 1 generates the mist jet 18 shown in dashed lines. During its generation, a dispersed powder, i.e., a dust stream, is supplied to the mist jet within the casing tube 11 along with the intake air. This results in intensive contact between dust particles and mist droplets. The dust particles are thus dispensed in a liquid-bound form and arrive in this form at the surfaces to be dusted.

[0022] This results in good adhesion of the applied dust.

[0023] The air flow rate through the air tube 6 and the water flow rate through the line 17 can be regulated separately (not shown), for example by means of appropriate control valves or pressure controls. This allows the powder-to-water ratio in the mist jet 18 to be regulated to the desired level.

Claims

[1] Dusting device (1) for applying dusts to surfaces via an air path, comprising a disperser (3, 5, 6) for outputting a stream of powder (2) dispersed in air, wherein a discharge opening (8) of the disperser (3, 5, 6) is arranged in an intake area of ​​a water-fed mist generator (13, 14, 15, 16, 17), characterized by , that the fog jet generator is surrounded by a jacket tube (11) whose jacket tube axis is arranged concentrically to the jet axis of the fog jet generated by the fog jet generator, wherein the fog jet generator has several ejectors (15) supplied with water under pressure, which are arranged to be rotatable and driven in rotation about the jet axis, and which each generate a water jet (18) parallel or slightly inclined to the jet axis and rotating around it, wherein the slight inclination of the ejectors (15) makes the rotating drive possible. [2] Dusting device according to claim 1, characterized by , that the outer casing (11) is open on the intake side. [3] Dusting device according to one of the preceding claims, characterized by , that its air flow rate and its water flow rate are designed to be separately adjustable.

Images