JP2004114041A - Ultrasonic standing wave atomizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a spray mist of coating material which is suitable for the coating of a workpiece. <P>SOLUTION: An ultrasonic standing wave atomizer is provided with a sonotrode 14 and a component arranged to face the sonotorode 14. In the operation, an ultrasonic field of the standing wave is formed in a space between the sonotrode 14 and the component 16. The atomizer is provided with at least one of a coating material supply device 66 and the coating material is fed to the vicinity of a region where the particle speed of the sound in the ultrasonic field exhibits the maximum value. Blocking elements 12, 74, 98 and 114 are provided on the side surface of a pipe piece and in the vicinity of a coating material outlet point 107 in a state of being separated from free end. The blocking elements 12, 74, 98 and 114 have an effect that the flow of the coating material along the longitudinal direction of the pipe pieces 10, 20, 70 and 90 in the outside of the pipe pieces is prevented. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an ultrasonic standing wave atomizer device for generating a spray mist of paint for painting a workpiece. The apparatus comprises a sonotrode and a component disposed opposite the sonotrode, such that during operation, a standing wave ultrasonic field is formed in a space intermediate the sonotrode and the component. Furthermore, the apparatus comprises at least one paint supply device, by means of which the paint can be fed in the vicinity of the region where the particle velocity of the sound of the ultrasonic field is at a maximum.

The commonly known high rotational speed atomizers are now preferred for painting workpieces, especially in the case of mass production coatings, as is often done in the automotive industry. In the case of high rotational speed atomization, the paint passes through the interior of the metal bell and reaches its front side. Here, the front side of the metal bell-shaped member faces the workpiece. The metal bell is typically driven by a turbine of compressed air and rotates at a maximum speed of 80,000 revolutions per minute. The centrifugal force acting in this case then causes the paint to reach the front edge of the bell, where it breaks up into fine droplets. This has the effect that the droplet size of the spray mist of the paint falls in the range of 10 μm to 60 μm (required for proper quality of the coating of the paint).

According to a consideration of the principles which have become generally known, in principle, paints can also be atomized by means of ultrasonic standing-wave atomization. However, according to these considerations of this principle, although the average droplet size during atomization is measured from 100 μm to 200 μm, larger droplets are also generated at the same time. However, large droplets of this kind adversely affect the quality of the coating of the paint. This makes the use of ultrasonic standing waves in coating technology less attractive.

In view of such prior art, an object of the present invention is to provide an ultrasonic standing wave atomizer for generating a spray mist of paint. By using this device, the paint particles are made sufficiently small, thereby producing a coating result of suitable quality on the workpiece to be coated.

The above object is achieved by an ultrasonic standing wave atomizer device according to the present invention. The present invention is an ultrasonic standing wave atomizer for generating a spray mist of paint for painting a workpiece, and has the features defined in claim 1.

That is, the ultrasonic standing wave atomizer device of the present invention includes a sonotrode and a component arranged opposite to the sonotrode, and when operating, a standing wave is placed in a space between the sonotrode and the component. Is formed.

Further, the ultrasonic standing wave atomizer apparatus includes at least one paint supply device, and the paint supply device feeds paint near a region where the particle velocity of the sound of the ultrasonic field is maximum. The at least one paint supply device is substantially configured as a piece of pipe in the region of the ultrasonic wave field of the standing wave, and the paint is sprayed from its free end and atomized.

Further, in the ultrasonic standing wave atomizer device, at least one blocking element is attached to a side surface of the pipe piece near the paint outlet point and away from the free end, or the pipe piece is A blocking element is formed at least near the paint outlet point. This blocking element has the effect of preventing the flow of paint along the length of the pipe piece on the outer periphery of the pipe piece and outside the region where the speed of the paint is at a maximum value.

特有 A particular advantage of this configuration according to the invention is that the blocking element reliably prevents paint flow along the outside of the pipe piece. The paint outlet point is located near the region where the particle velocity of the sound of the ultrasonic field is at a maximum. However, this type of device does not guarantee that the sprayed paint is completely atomized. The reason is that the sound particle velocity decreases relatively rapidly in all spatial directions, starting from the maximum. As the sound particle velocity decreases, so does the ability to atomize the ultrasonic paint.

With the blocking element according to the invention, it is possible to prevent the paint from flowing along the outer circumference of the pipe piece, ie outside the region where the sound particle velocity is at a maximum. In this case, the shape of the blocking element according to the idea of the invention is in principle not subject to any restrictions, as long as it prevents paint from flowing out of the region where the sound particle velocity is at a maximum.

In an advantageous embodiment of the idea of the invention, said component is a further sonotrode. In this way, a more stable and particularly stable ultrasonic field is formed.

A further improvement with respect to the formation of the ultrasonic field is, according to the invention, if a stabilizer element affecting the acoustic field is mounted on the free end of the pipe piece, and If the pulsation of the acoustic field in the vicinity of the element is thereby prevented.

In a particularly preferred design, the stabilizer element is formed in a single piece with a blocking element. However, it may also be a separate component or other form connected to the blocking element. In any case, by adopting an appropriate shape, ultrasonic field pulsation is reduced in the vicinity of the stabilizer element. As a result, the process of atomizing the sprayed paint into small droplets is effectively improved.

A further effective form of the ultrasonic standing wave atomizer device according to the present invention is characterized by an excitation device. In support of the atomizing process, the excitation device can be used to excite and vibrate the pipe pieces. The reason is that vibrating the pipe pieces was found to effectively support the atomization of the paint.

A particularly advantageous form of this excitation device is one in which the pipe pieces are connected to the sonotrode in an oscillatory manner. The sonotrode, which is already a vibration-exciting element, has the additional function of further vibrating the pipe piece as a result of connecting it to the pipe piece by vibration manners. The excitation of this oscillation is consequently realized in a particularly simple manner.

A further effective possibility for vibrating the pipe pieces and consequently providing effective support for the process of atomizing paint is that the excitation device excites ultrasonic vibrations Is to have a component that can This component is located at a suitable point in the ultrasonic field and can thereby generate ultrasonic vibrations there and transmit to the pipe pieces.

In this way, the pipe pieces are excited to generate vibrations, which in turn, effectively support the process of atomizing the paint. A further possibility of the configuration of the excitation device according to the invention is that: It has at least one excitation element, the excitation element being connected to the blocking element, and the at least one excitation element having a region of an ultrasonic field suitable for exciting vibrations Is to be placed inside. That is, as one difference from the possibility described above, the at least one excitation element is excited and vibrated by the ultrasonic field, and the vibration is transmitted to a shutoff element. It can be excited and vibrated.

This atomization process is further improved by the configuration of the ultrasonic standing wave atomizer device described below. For this purpose, the blocking element is connected to the pipe piece via a spring. As a result, a vibration system consisting of a spring and a mass that can be excited and vibrated by the ultrasonic field is constituted by the blocking element and the spring.

In a preferred case, the blocking element likewise comprises at least one excitation element and is thus excited and oscillated. The vibration is transmitted to the pipe piece via the spring. In this way, again, the atomization process is supported and improved by the vibration of the pipe pieces. The formation of unacceptably large droplets in the atomized paint is thus prevented.

更 A further embodiment of the ultrasonic standing wave atomizer device according to the present invention is effective if there is a flow of air for cleaning. This prevents or reduces wetting of the sonotrode or the component. In this way, a particularly high percentage of atomized paint can be used for the actual painting process.

A further possibility offered to improve the coating process according to the invention is that the directing air flow is used for the purpose of affecting the trajectory of the spray mist of the created paint. It is possible to say. As a result, a preferred direction, ie, in particular the direction in which the coating is to be performed, is provided to the paint spray mist by the directing air flow.

Further support for this process, and therefore an improvement in the painting process, especially if the paint is electrostatically charged with another device already in said paint supply device or after atomization Realized if possible. At present, the workpiece to be painted is usually connected to ground, but in this case the further device and / or the paint supply device is connected to a correspondingly higher voltage.

Further advantageous forms of the subject of the invention can be learned from the dependent claims.

The present invention, its advantageous effects, and further refinements thereof are described and described in more detail based on the illustrative embodiments shown in the accompanying drawings.

FIG. 1 shows a first ultrasonic standing wave atomizer 8 based on the present invention. This figure is represented by the isometric projection method. The Cartesian coordinates are indicated in the coordinate system by arrows in the X, Y and Z directions. It should be noted that this figure is only intended to show the outline of the apparatus, and therefore, the exact relative size cannot be known from this figure.

The first sonotrode 14 is disposed so as to face the first reflecting body 16 with each other. In this figure, the sonotrode 14 is symbolically represented by a cylindrical base body 22 and a sound body 21. The sound body 21 protrudes from the end face of the cylindrical base body 22 and faces the reflecting body 16.

In this case, the shape of the sound body 21 is substantially cylindrical, like the sonotrode 14. Regarding the end faces of the sound body 21 and the reflection body 16 that face each other, the end face of the sound body 21 is called a first sound face 24, and the end face of the reflection body 16 is called a second sound face 26. I do. The first sound face 24 and the second sound face 26 are constituted by concave surfaces, that is, their shapes have a shape substantially corresponding to a part of the surface formed by the virtual hollow sphere. ing.

A first dashed line 17 and a second dashed line 19 have been drawn above the first sound face 24 to represent this shape. The intersection of the first dashed line 17 and the second dashed line 19 is located exactly at the center of the first sound face 24.

(2) Two lines corresponding to the first broken line 17 and the second broken line 19 are also drawn on the second sound face 26 without special reference numerals. The central axis 28 passes through the intersection of the first dashed line 17 and the second dashed line 19 and through the intersection of the corresponding two lines of the second sound face 26. This center line extends exactly in the direction of the X coordinate.

In the space between the first sound face 24 and the second sound face 26, the first pipe piece 10 is shown. The first end face of the free end of the first pipe piece 10 is located exactly between the sound faces 24 and 26. Further, it ends directly on the central axis 28. The first pipe piece 10 is formed so as to be arranged straight in the longitudinal direction and parallel to the Y direction.

Furthermore, the first pipe piece 10 is part of a paint supply device (other parts not shown), which are to be atomized by the first ultrasonic standing wave atomizer device 8. Supply the required amount of paint. Thus, the other end of the first piece of pipe 10 is depicted as if it ends in "free space", but in fact there is a connection with the paint supply device in question. There is.

代表 Typical value of the paint supply speed is from 200 mL / min to 400 mL / min. Furthermore, the use of this paint supply device to supply paint to a plurality of pipe pieces 10 can be readily envisioned and is within the scope of the present invention. The free ends of the plurality of pipe pieces are then respectively located in the ultrasonic field at the locations where the particle velocities of different sounds have a maximum value. This is described in more detail below.

At the first end of the first pipe piece 10, an annular first blocking element 12 is arranged. Details of the first pipe piece 10 and the first blocking element 12 can be seen from FIG. However, in FIG. 1, from the first end of the first pipe piece 10, to be precise, the partial region where the maximum value of the particle velocity of the sound of the ultrasonic field of the standing wave appears in the intermediate space. It is also intended to show that the paint can be jetted. This means that in FIG. 1, the first graphic 32 (the X axis of which coincides with the central axis 28) has the maximum value of the sound particle velocity in the ultrasonic field in that region. Is indicated. The second graphic 34 is offset to some extent in the Y direction and shows that the sound particle velocity decreases relatively quickly in the Y direction.

As a result, an ultrasonic field of a standing wave that produces the maximum value of the sound particle velocity only at the nodes is formed in the space between the sound body 21 and the reflection body 16. As a result, if the paint attempts to flow out of the region where the sound particle velocity is at a maximum value and enters the region where the sound particle velocity is low, the atomization of the paint can occur to a correspondingly small extent. Only.

However, the first blocking element 12 is arranged in the first piece of pipe 10 near the paint outlet. As a result, sprayed paint that has not been immediately atomized by the standing wave ultrasonic field is prevented from flowing out of the region where the sound particle velocity is at a maximum in an effective manner. In the case of the example shown in FIG. 1, the outer diameter of the first blocking element 12 is chosen such that there is no longer a particle velocity of the sound radially outward. As a result, in any case, the paint is prevented from flowing out along the longitudinal direction of the first pipe piece 10 outside the first pipe piece 10.

FIG. 2 shows a sectional view of the first pipe piece 10, particularly in the region of the free end, and a plan view of a portion indicated by “A-A” in the sectional view.

断面 In this sectional view, it is shown that the first blocking element 12 is formed as an annular disk and terminates directly at the free end of the pipe piece 10 and is connected to the pipe piece. The opening of the first pipe piece 10 on the free end side is used as a first paint outlet 11.

エ ッ ジ To better understand the relationship between the cross-sectional view and the plan view, the edges visible in the two figures are each connected by diagonal lines. Consequently, it can be seen from this plan view that the first blocking element 12 is represented by an ellipse in its radially outer shape. On the other hand, the clearance arranged at the center of the first blocking element 12 for receiving the first pipe piece 10 is circular.

O The elliptical shape outside the first blocking element 12 is particularly advantageous. The reason is that this shape substantially corresponds to the shape of the sheet-like paint formed in the ultrasonic field of the standing wave in the sectional view in the Y direction. If the first blocking element 12 is used, for example, in a first ultrasonic standing wave atomizer device 8 according to FIG. 1, the elliptical principal axis of the first blocking element 12 is relative to the Z direction. Will be arranged in parallel.

FIG. 3 shows the second pipe piece 20 formed at its free end as a sheet-shaped stabilizer 36. The view in FIG. 3 has been chosen so that the first outlet opening 38 can be seen on the sheet-like stabilizer 36. Through this first outlet opening, the paint is delivered and atomized.

A substantially disk-shaped stabilizer element 42 is formed at the free end of the second pipe piece 20 as an extension of the longitudinal axis of the second pipe piece 20. If the second pipe piece 20 with the stabilizer element 42 is used in the first ultrasonic standing wave atomizer device 8 according to FIG. 1, the end face of the stabilizer element 42 will be in the X direction and It will be located in a plane determined by the Z direction.

This stabilizer element 42 has the great advantage of preventing or minimizing the pulsation of the standing wave ultrasonic field that occurs in this region, thereby improving the atomization of the paint delivered through the outlet opening. ing. The paint particles 44 are drawn in exaggerated size and are intended to merely indicate the area where atomization occurs in this example in relation to the location of the stabilizer element 42. In fact, a spray mist of paint with a particle size (or droplet size) smaller than 60 μm is realized. Such small particle sizes are very suitable for achieving good painting results.

FIG. 4 shows, in particular, a cross-sectional view of the second pipe piece 20 in the region of the free end, and a plan view from the viewpoint indicated by “A-A” in this cross-sectional view. In this cross section, the hollow cylindrical region 46 of the second pipe piece 20 can be seen. The second pipe piece 20 has a second outlet opening 48 in addition to the first outlet opening 38 in the area of the free end of the second pipe piece 20. From the two figures, it can be seen that the stabilizer element 42 is formed integrally with the second pipe piece 20.

FIG. 5 shows the first atomizer device 30. This device is assembled in the same manner as the first ultrasonic standing wave atomizer device 8. Therefore, the same reference numerals as those in FIG. 1 are used for the same components.

The first pipe piece 10 is represented here with a first blocking element 12 at the free end. Furthermore, in this figure, the paint supply device 52 is represented in an implicit manner, exactly in the area where the first pipe piece 10 is connected to the paint supply device 52,
In this figure, it is specifically intended to show one example of an excitation device according to the invention. Here, the excitation device is represented by a coupling element 54. This connecting element 54 is rigidly connected to the sound body 21 by an annular clip 56 and to the first pipe piece 10 by a second clip 58. These two clips 56, 58 are firmly connected to each other by a connecting rod 62.

ソ When the first atomizer device 30 is operated, the sonotrode 14 generates an ultrasonic standing wave. This, in particular, excites the sound body and produces a corresponding vibration in the direction of the central axis 28 in the front-rear direction. This is indicated by a double arrow 64 in the figure.

前後 The front-back vibration of the sound body 21 is transmitted to the clip 56 and from there to the second clip 58 via the connecting rod 62. As a result, the second clip 58 vibrates the first pipe piece 10 in the front-back direction in synchronization with the sound body 21. Eventually, the sonotrode 14 is connected to the first pipe piece 10 by vibratory manner. The longitudinal vibration of the first pipe piece 10 has the effect of effectively supporting the process of atomizing the paint.

FIG. 6 shows a further possibility of the configuration of the second atomizer device 40 according to the present invention. In this case, the sound bodies 21 of the sonotrode 14 and the reflective body 16 are likewise arranged facing each other in the same way as already shown in FIG. In this example, the paint supply device 66 sends the paint through the second pipe piece 20 to be atomized. In this selected example, the excitation of the vibration of the second pipe piece 20 is caused by the excitation disk 68 attached to it.

The connection point between the excitation disk 68 and the second pipe piece 20 is located near the free end of the second pipe piece 20; This ensures that the force emanating from the excitation disk 68 to excite the vibration is introduced into the second pipe piece 20 in an effective manner. The excitation disk 68 has a shape similar to a circular disk. This circular disc is simply adapted to the shape of the second pipe piece in the connection area for the second pipe piece.

The end faces on both sides are arranged in this example such that they are inclined about 45 degrees with respect to the longitudinal axis of the second pipe piece 20 and 45 degrees with respect to the central axis 28. I have.

(4) The excitation disk 68 is arranged in an area where the maximum achievable sound pressure is generated in the ultrasonic standing wave field. In this example, a position inclined about 45 degrees produces an effect that an adequately large collision area is applied to the sound pressure to create an appropriate force that is effective to excite vibration.

To illustrate this effect, the exaggerated sound pressure and vibration curves of the standing wave ultrasonic field are shown in this region. The excitation disk 68 is consequently deliberately positioned in the region of the maximum sound pressure achievable, whereas the free end of the second pipe piece 20 is adapted for the sound particle velocity of the standing wave ultrasonic field Is located at the position of the maximum value of.

力 The force effect of the sound pressure on the excitation disk 68 is represented by a first arrow 69, which points in a direction parallel to the central axis 28. The force effect pointed out earlier bends the second piece of pipe by an amount in the direction of the force. The resulting stress in the second pipe piece 20 creates a restoring force. The restoring force is represented by the second arrow 71.

僅 か A slightly different position of the excitation disk 68 in the standing wave ultrasonic field exerts a correspondingly different force effect on the excitation disk 68. As a result, this generates a longitudinal movement or vibration of the second pipe piece 20. This likewise occurs substantially in the direction of the central axis 28. Appropriate selection of the size of the end face of the excitation disk, the point of connection of the excitation disk 68 to the second pipe piece 20, the angle between the longitudinal axis of the pipe piece and the excitation disk 68, and the weight of the excitation disk 68 This can affect the frequency and intensity of the vibrations created in the second pipe piece 20.

In FIG. 7, the pipe piece 50 is shown as a side view to show the configuration of the pipe piece 50 with the second pipe piece 20 and the excitation disk 68. This diagram is a diagram viewed from a viewpoint rotated by 90 degrees from the viewpoint in FIG. In this figure, the disk shape of the excitation disk 68 can be seen and the connection point with the second pipe piece 20 can be recognized.

FIG. 8 shows a third atomizer device 60. The sound body 21 of the sonotrode 14 is likewise arranged on the opposite side of the reflecting body 16. The third pipe piece 70 is connected at one end to a second paint supply device 72. This second paint supply device 72 is shown only conceptually. In contrast, its free end is connected to a second blocking element 74 and terminates at the central axis 28. Disposed above the second blocking element 74 is a first excitation element 76 and a second excitation element 78, which are arranged side by side with each other. In each case, the excitation elements 76, 78 have an angle of about 30 ° C. with respect to the central axis 28 and an angle of about 60 ° C. with respect to the longitudinal axis of the third pipe piece 70. I have.

To illustrate the effects of the excitation elements 76, 78 in more detail, a first force vector 82 and a second force vector 84 are shown in this figure. The first force vector 82 is parallel to the central axis 28 and its tip points in the direction of the first excitation element 76. The second force vector 84 is likewise parallel to the central axis 28, but its tip points in the direction of the second excitation element 78. The free end of the third pipe piece 70 is likewise intended to be located in the region where the sound particle velocity is a maximum in the standing wave ultrasonic field. At this point, the sound pressure is equal to zero, which is indicated by the second sound pressure curve 86. This curve and the associated second vibration curve 88 are likewise represented on an exaggerated scale in this figure, merely for clarity of explanation.

As a result, this figure shows for the first time that the excitation elements 76, 78 are arranged at a distance from the third pipe piece 70 by the second blocking element 74. The spacing is set such that the excitation elements 76, 78 are located outside the region where the sound particle velocity is at a maximum, thereby receiving a force from the sound pressure generated there. This force causes a torsional vibration indicated by directional arrow 92. The vibration of the excitation elements 76, 78 is indicated by a double arrow 94.

To illustrate what has been described above, FIG. 9 shows a longitudinal plan view of the third pipe piece 70 when the free end is viewed from the front. In this figure, it can be seen that the second blocking element 74 has an oval or an oval-based shape. In this figure it can also be seen that the first excitation element 76 and the second excitation element 78 are arranged on different sides of the central axis 28. The force vectors 82, 84 therefore act on the excitation elements 76, 78 parallel to the central axis 28, but at a distance therefrom. In this way, the direction of the first force vector 82 is exactly opposite to the direction of the second force vector 84, and the force effects of the force vectors 82, 84 are not offset by those effects. .

Due to the point at which the forces shown in this figure act, the third pipe piece 70, together with the second blocking element 74 and the excitation elements 76, 78, is subjected to rotational vibrations. It is likewise indicated by a directional arrow 92. In this case, the axis of rotation of these rotational vibrations is exactly perpendicular to the plane of the paper in this figure.

FIG. 10 shows a fourth atomizer device 80. In this device, the sound body 71 of the sonotrode 14 is likewise arranged on the opposite side of the reflecting body 16. The free end of the fourth pipe piece 90 likewise reaches just the central axis 28. On the other hand, the other end of the fourth pipe piece 90 is connected to the third paint supply device 96. At the free end of the fourth pipe piece 90, a third blocking element 98 is arranged. This third shut-off element 98 is formed in a manner similar to the second shut-off element 74 shown above, that is, has a third excitation element 100 and a fourth excitation element 102.

However, unlike the second blocking element 74 shown above, the third blocking element 98 has no fixed connection to the fourth pipe piece 90. The clearance provided at the center thereof allows the third blocking element 98 to move on the outer side surface of the fourth pipe piece 90 in the longitudinal direction of the central axis of the fourth pipe piece 90 in the front-rear direction. It is set to be able to. The stop element 104 is located in the area of the paint outlet 106 and is therefore located near the free end of the fourth pipe piece 90. The stop element 104 prevents the third blocking element 98 from leaving the area guided axially by the fourth pipe piece 90.

A helical spring 106 is disposed on a side surface of the third blocking element 98 so as to face the third paint supply device 96. This helical spring 106 is guided by a fourth pipe piece 90 and at one end of the third blocking element 98 and at the other end of the mounting element 108, in an axial direction with respect to the fourth pipe piece 90. Supported.

However, in this selected example, the helical spring 106 is free to rotate about the longitudinal axis. This is not absolutely necessary for the idea of the present invention, but it is shown that in this chosen example the fourth pipe piece 90 can vibrate in the direction of its longitudinal axis. Intended. This is indicated by the vibrating direction arrow 110.

長 手 Longitudinal vibration of the fourth pipe piece 90 is likewise caused by the third excitation element 100 and the fourth excitation element 102. They initially capture the sound pressure created by the standing wave ultrasonic field in the form of the resulting force effect.

構造 Due to the construction of this third blocking element 98 as described above, only the longitudinal force of the fourth pipe piece 90 can be transmitted. The third blocking element 98 is connected to the fourth pipe piece 90 by a helical spring 106 that is movable in the rotation direction.

The helical spring 106, together with the third blocking element 98, can also be considered as a mass-spring device (ie, a vibration excitation system). Due to the natural vibration frequency predetermined by this system, the fourth pipe piece 90 starts to vibrate in the axial direction. A second sound pressure curve 86 and a second vibration curve 88 are also depicted in the fourth atomizer device 80 to illustrate the standing wave ultrasonic field.

As a further possibility of a configuration of the fourth blocking element 114 according to the invention, FIG. 11 shows that such an element is in a first axial position A together with a fourth pipe piece 90 in the device. , And a state at the second axial position B.

The fourth blocking element 114 is formed such that the fourth blocking element 114 covers the paint outlet 107 of the fourth pipe piece 90 in the position A described above in the axial direction of the fourth pipe piece 90. This fourth blocking element 114 creates an additional barrier, which prevents paint from flowing out from the region where the sound particle velocity is at a maximum, ie from the region of the paint outlet 107.

位置 The position B of the fourth blocking element 114 indicates its axial position. In this position, the disc-shaped part of the fourth blocking element 114 is exactly located in the same axial plane as the paint outlet 107. Thus, in this position B, the helical spring 106 is compressed due to the force effect applied to the excitation elements 100,102. The spring force of the helical spring 106 can be adjusted in a simple manner, thereby ensuring that undesired excessive compression of the helical spring 106 is prevented. The so-called overshooting, ie the complete release of the undesired paint outlet 107, is thus prevented.

The figure which shows the ultrasonic standing wave atomizer apparatus provided with the 1st pipe piece. The figure which looked at the 1st pipe piece from two directions. The side view of a 2nd pipe piece. The figure which looked at the 2nd pipe piece from two directions. The figure which shows a 1st atomizer apparatus. The figure which shows a 2nd atomizer apparatus. The figure which shows a 3rd pipe piece. The figure which shows a 3rd atomizer apparatus. The figure which shows a 4th pipe piece. The figure which shows a 4th atomizer apparatus. The figure which looked at the 5th pipe piece from two directions.

Explanation of reference numerals

9 first ultrasonic standing wave atomizer device, 10 first pipe piece, 11 first paint outlet, 12 first shutoff element, 14 sonotrode, 16 ... reflective body, 17 ... first broken line, 19 ... second broken line, 20 ... second pipe piece, 31 ... sound body, 22 ... bass body, 24 first sound face, 26 second sound face, 28 central axis, 30 first atomizer device, 32 first graphic, 34 ..Second figures, 36: sheet-shaped stabilizer, 38: first outlet opening, 40: second atomizer device, 42: stabilizer element, 44: paint Particles, 46 ... hollow cylindrical area, 48 ... second outlet opening 50 ... pipe piece device, 52 ... paint supply device, 54 ... connecting element, 56 ... clip, 58 ... second clip, 60 ... third atomizer device, 62 ..Connecting rod, 64 ... bidirectional arrows, 66 ... paint supply device, 68 ... excitation disk, 69 ... arrows, 70 ... third pipe piece, 71 ... second Arrow, 72 ... second paint supply device, 74 ... second shut-off element, 76 ... first excitation element, 78 ... second excitation element, 80 ... fourth Atomizer device, 82 ... first force vector, 84 ... second force vector, 86 ... second sound pressure curve, 88 ... second vibration curve, 90 ... Four pipe pieces, 92 ... direction arrow, 94 ... double direction arrow, 96 ... Third paint supply device, 98 ... third shut-off element, 100 ... third excitation element, 102 ... fourth excitation element, 104 ... stopper element, 106 ... spiral Spring, 107: paint outlet, 108: mounting element, 110: arrow in vibration direction, 112: arrow in force direction, 114: fourth blocking element.

Claims (17)

An ultrasonic standing wave atomizer apparatus (8, 40, 60) for generating a spray mist of paint for painting a workpiece, the apparatus comprising:
It comprises a sonotrode (14) and a component (16) arranged opposite to the sonotrode, and, during operation, a standing ultrasonic wave in a space between the sonotrode (14) and the component (16). A field is formed;
At least one paint supply device (66), which is capable of delivering paint in the vicinity of the region where the sound particle velocity of the ultrasonic field is at a maximum;
With the following features:
The at least one paint supply device (66) is substantially configured as a pipe piece (10, 20, 70, 90) in the region of the standing wave ultrasonic field, and paints from the free end of the pipe piece. Can be spouted to atomize;
Further, a blocking element (12, 74, 98, 114) is provided on the side of the pipe piece near the paint outlet point, away from the free end, or alternatively, the pipe piece (10, 20, 70, 90) are formed as blocking elements (12, 74, 98, 114) at least near said paint outlet point (107);
The blocking elements (12, 74, 98, 114) have the effect of preventing the flow of paint along the longitudinal direction of the pipe pieces (10, 20, 70, 90) on the outer surface of the pipe pieces. The ultrasonic standing wave atomizer device (8, 40, 60) according to claim 1, having the following features:
The shape of the inner diameter of the pipe pieces (10, 20, 70, 90) is in particular circular, oval or rectangular. The ultrasonic standing wave atomizer device (8, 40, 60) according to claim 1 or 2, having the following features:
The component is a second sonotrode. The ultrasonic standing wave atomizer device (8, 40, 60) according to any one of claims 1 to 3, having the following features:
Said blocking elements (12, 74, 98, 114) are large compared to the area around the outlet, which has a sound particle velocity which is large enough to atomize the ejected paint. The ultrasonic standing wave atomizer device (8, 40, 60) according to claim 4, comprising the following features:
The shape of the blocking element (12, 74, 98, 114) is adapted to the region of sufficiently loud sound particle velocity. The ultrasonic standing wave atomizer device (8, 40, 60) according to any one of claims 1 to 5, having the following features:
A stabilizer element (42) interacting with the acoustic field is attached to a free end of the pipe piece (10, 20, 70, 90), whereby the acoustic field in the vicinity of the stabilizer element (42). Pulsation is reduced by this stabilizer element. The ultrasonic standing wave atomizer device (8, 40, 60) according to any one of claims 1 to 6, having the following features:
The pipe pieces (10, 20, 70, 90) can be excited and vibrated using an excitation device in order to support the atomization of the paint and make the droplets as small as possible. The ultrasonic standing wave atomizer (8, 40, 60) according to claim 7, comprising the following features:
The excitation device is a sonotrode (14), and the pipe pieces (10, 20, 70, 90) are coupled to the sonotrode (14) with vibration manners for the purpose of exciting vibration. The ultrasonic standing wave atomizer (8, 40, 60) according to claim 7, comprising the following features:
The excitation device comprises a component capable of exciting ultrasonic vibrations;
Said component is located at a suitable point to excite ultrasonic field vibrations;
The excited vibration can be transmitted to the pipe pieces (10, 20, 70, 90). s The ultrasonic standing wave atomizer (8, 40, 60) according to claim 7, comprising the following features:
The excitation device has at least one excitation element (76, 78) connected to the blocking element (12, 74; 98, 114);
The at least one excitation element (76, 78) is arranged in a region of an ultrasonic field suitable for exciting vibration. The ultrasonic standing wave atomizer device (8, 40, 60) according to claim 10, comprising the following features:
Said blocking element (12, 74, 98, 114) is connected to said pipe piece (10, 20, 70, 90) by a spring (106);
The blocking element (114) and the spring (106) form a spring-mass-vibration system (114, 106), which can be excited and vibrated by the ultrasonic field. An ultrasonic standing wave atomizer device (8, 40, 60) according to claim 11, comprising the following features:
The blocking element (114) at least temporarily protrudes axially beyond the free end of the pipe piece (90). The ultrasonic standing wave atomizer (8, 40, 60) according to claim 7, comprising the following features:
The excitation device is a flat component and is connected to the pipe piece at an angle other than perpendicular to the longitudinal axis of the pipe piece (10, 20, 70, 90). An ultrasonic standing wave atomizer device (8, 40, 60) according to any of the preceding claims, having the following features:
The pipe pieces (10, 20, 70, 90), the shut-off elements (12, 74, 98, 114), the excitation elements (76, 78), and / or the mass-spring system (106, 114) Has a hydrophobic surface, especially a surface made of a tetrafluoroethylene coating. An ultrasonic standing wave atomizer device (8, 40, 60) according to any of the preceding claims, having the following characteristics:
It has a flow of cleaning air that can prevent or reduce wetting of the sonotrode (14) and / or the component (16). An ultrasonic standing wave atomizer device (8, 40, 60) according to any of the preceding claims, having the following features:
It has a flow of directing air, which can affect the flight trajectory of the spray mist of the paint. An ultrasonic standing wave atomizer device (8, 40, 60) according to any of the preceding claims, having the following features:
A charging device for charging the paint with static electricity.

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