JP2004058268A - Air blast device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air blast device of greatly improved performance with compared to a conventional device and capable of performing high speed processing. <P>SOLUTION: This device is composed of an ultrasonic nozzle 11 generating ultrasonic air flow, a jet object supply port 12, an induction mixing chamber 13 having ultrasonic flow and jet object flow therein and inducibly mixing jet object and ultrasonic flow to generate mixed air flow, and an injection port 14 making mixed air flow collide with an object 6. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pneumatic injection machine, a so-called air blast device.
[0002]
An air blast device is a device for treating or processing the surface of an object by mixing a jet with an air stream and causing the mixed air stream to collide with the surface of the object at a high speed.
[0003]
The range of use of this air blasting device is, for example, (a) white line peeling, road surface treatment such as asphalt cleaning, (b) peeling of external paint on buildings, bridges, ships, aircrafts, etc., that is, outdoor structural paint peeling processing, (C) Blast treatment for automobile maintenance, (d) Blast treatment for plating base treatment, (e) Deburring treatment of machine parts and resin parts, (f) Polishing or processing of metal, wood and resin parts, (g) Polishing or processing precision parts (mechanical, electronic), (h) return processing, (i) resource recycling processing, and so on.
[0004]
[Prior art]
FIG. 13 is a diagram showing a typical principle configuration of a general air blast device.
[0005]
In this drawing, reference numeral 1 denotes an entire air blast apparatus, and an inflow pipe 2 for high-pressure air, an inflow pipe 3 for an ejected material made of fine particles such as glass beads, alumina, etc., and these inflow pipes And a nozzle 4 for mixing and jetting the respective flows from 2 and 3. Then, the mixed air flow 5 from the nozzle 4 collides with the object 6, and the surface thereof is subjected to a surface treatment such as polishing and peeling or a processing such as micro engraving. In addition, as an example of a general air blast device, there are the following Patent Documents 1 and 2.
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-38864 [Patent Document 2]
Japanese Patent Application Laid-Open No. 9-109029
[Problems to be solved by the invention]
The general air blasting apparatus 1 shown in FIG. 13 has been used for a long time and has been widely used in the blasting / processing field.
[0007]
By the way, due to the growing interest in resource recovery in recent years, among the above-mentioned processes, (i) the use for the resource recycling process is rapidly expanding. For example, there is a process of removing various colored paints attached to the surface when recovering high-purity aluminum or iron materials from a large amount of aluminum or steel cans collected as garbage. This is an important step as a pretreatment.
[0008]
However, when the above-described conventional air blasting apparatus 1 is used, a considerable time is required for the pretreatment process, which becomes a bottleneck, and a high-performance and high-speed resource recycling process cannot be realized. there were. However, this problem is not limited to the resource recycling process as an example described above, but is a problem common to the various processes (a) to (h) described above.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an air blast apparatus which can achieve much higher performance and higher processing speed as compared with the related art.
[0010]
[Means for Solving the Problems]
FIG. 1 is a sectional view showing the principle configuration of the present invention.
[0011]
As shown in the drawing, an air blast device 10 according to the present invention includes a supersonic nozzle 11 for generating a supersonic airflow 17, an injection supply port 12 for supplying an injection, and a supersonic speed from the supersonic nozzle 11. An induction mixing chamber 13 for flowing the airflow 17 and the jet from the jet supply port 12 and mixing the jet with the supersonic airflow 17 by induction to generate a mixed airflow 15; A jet 14 for causing the mixed air flow 15 generated in the induction mixing chamber 13 to collide with an object 16 to be blasted.
[0012]
Of particular note in the present invention are firstly the use of a supersonic nozzle and secondly, the provision of an induction mixing chamber 13.
[0013]
First, the point at which a supersonic nozzle is employed will be considered. This supersonic nozzle itself is already known in principle as a Laval nozzle. The supersonic nozzle is generally widely used in large-scale facilities or machines such as an experimental wind tunnel and a jet engine.
[0014]
Therefore, it seems that there has been no idea of applying the supersonic nozzle to a relatively small-sized pneumatic injection machine. Incidentally, while the speed of the air flow ejected from the typical nozzle 4 as shown in FIG. 12 is about 100 m / sec at the maximum, the speed of the air flow ejected from the supersonic nozzle is 1000 m / sec. It reaches the order above and exceeds Mach. Therefore, a supersonic (Mach 1 to 5) and even a hypersonic (Mach 5 to 11) airflow can be obtained from the supersonic nozzle 11.
[0015]
As described above, there has never been an idea to convert such a supersonic nozzle to a pneumatic injection mechanical device. However, even if the idea is conceived, it is not possible to realize the air blast device 10 of the present invention simply by diversion from the above-mentioned large experimental cavity or jet engine to a small pneumatic injection mechanical device. I knew I couldn't.
[0016]
Therefore, the present inventors prototyped air blast devices of various structures that can use supersonic nozzles, and verified the performance of each device.
[0017]
As a result, it has been found that the air blast device 10 based on the configuration of FIG. 1 can sufficiently exhibit the original capability of the supersonic nozzle.
[0018]
The points of particular interest in the present invention are, first, the use of a supersonic nozzle and, secondly, the provision of an induction mixing chamber 13 as described above. The consideration regarding the first point is as described above. Here, the air blast device 10 based on the configuration of FIG. 1 described above enables the supersonic nozzle 11 to fully exhibit its original capability because of the two notable points described above. This is due to the latter idea of the second point. That is, the present invention is completed for the first time based on the idea of employing the induction mixing chamber 13 configured as shown in FIG.
[0019]
The induction mixing chamber 13 is arranged on the outlet side of the supersonic nozzle 11 as a means for mixing with the jet. Usually, it is common sense that such a mixing means is disposed on the inlet side of the nozzle (see FIG. 13), so the configuration of the present invention is completely opposite to the conventional one in this point.
[0020]
And the mixing chamber 13 of the present invention is an "induction" mixing chamber. In other words, it is completely different from the known “fog” mixing. If the principle of "mist spraying" is used, in FIG. 1, (i) the jet supply port 12 is placed immediately near the outlet of the supersonic nozzle 11 and (ii) the jet direction of the jet ( The arrow 19 in the figure) should be approximately perpendicular to the direction of flow of the supersonic airflow 17 immediately near its outlet.
[0021]
However, according to FIG. 1, (i) the jet supply port 12 is not located immediately adjacent to the outlet of the supersonic nozzle 11, and (ii) the jet direction (19) of the jet is supersonic air flow. Nor is it at right angles to the direction of flow of the seventeen.
[0022]
Thus, the mixing chamber 13 according to the invention is not a “mist” mixing chamber. The inventor has concluded from the results of various analyses that the device 10 of the present invention is based on "induction", not "mist", and will call this the induction mixing chamber 13. This “guidance” is schematically illustrated in FIG. 1 as a flow of an arrow 18.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 2 is a perspective view showing the first embodiment of the present invention. Throughout the drawings, the same components are denoted by the same reference numerals or symbols.
[0024]
3 (a) is a front view taken along the arrow A in FIG. 2, and FIG. 3 (b) is a front view taken along the arrow B in FIG.
[0025]
Although two jet supply ports 12 are provided in FIG. 1, one jet may be provided in principle. Alternatively, three or more jet supply ports 12 may be provided, and four jet supply ports 12 are provided in the first embodiment. Preferably, these four jet supply ports 12 are evenly arranged (see FIG. 3A).
[0026]
As shown in the figure, in the first embodiment, the jet supply port 12 is provided on the bottom surface 21 of the induction mixing chamber 13 which is substantially cylindrical. On the other hand, the injection port 14 is provided on the upper surface 22 thereof.
[0027]
FIG. 4 is a perspective view showing Embodiment 2 of the present invention,
5A is a front view of FIG. 4 as viewed from an arrow A, and FIG. 5B is a front view of FIG. 4 as viewed from an arrow B.
[0028]
The difference between the second embodiment and the first embodiment is that the four jet supply ports 12 are provided on the side surface 23 of the induction mixing chamber 13 which is substantially cylindrical. Also in this case, it is preferable that these four jet supply ports 12 are arranged evenly. Note that the jet supply port 12 may be provided on both the bottom surface 21 (Example 1) and the side surface 23 (Example 2) of the cylinder.
[0029]
FIG. 6 is a perspective view showing Embodiment 3 of the present invention.
7A is a front view of FIG. 6A, and FIG. 7B is a front view of FIG. 6B.
[0030]
The third embodiment corresponds to the first embodiment described above, except that the induction mixing chamber 13 in the first embodiment has a substantially cylindrical shape and is modified into a substantially truncated cone. The four jet supply ports 12 are equally arranged on the bottom surface 31 of the substantially truncated cone, and the jet ports 14 are provided on the upper surface 32 thereof.
[0031]
In the third embodiment (also a fourth embodiment to be described later), in the first and second embodiments described above, the flow caused by the induction 18 shown in FIG. 1 is “rough” in the upper left portion of the induction mixing chamber 13 shown in FIG. And remove the upper left portion. Thereby, further space saving of the air blast device 10 can be achieved. When the air blast device 10 is a portable type device, the side surface 33 of the truncated cone has a tapered shape, so that the field of view in front of the injection port 14 is widened, and the object (see FIG. 16) Workability is improved. Further, since the weight can be reduced, it is convenient to carry the portable portable device.
[0032]
FIG. 8 is a perspective view showing Embodiment 4 of the present invention,
FIG. 9A is a front view taken along the arrow A in FIG. 8, and FIG. 9B is a front view taken along the arrow B in FIG.
[0033]
The difference between the fourth embodiment and the third embodiment is that four jet supply ports 12 are provided on the side surface 33 of the induction mixing chamber 13 having a substantially truncated cone shape. Also in this case, it is preferable that these four jet supply ports 12 are arranged evenly. Note that the jet supply port 12 may be provided on both the bottom surface 31 (Example 3) and the side surface 33 (Example 4) of the truncated cone.
[0034]
Also, as shown, in Examples 3 and 4, the injection port 14 is provided on the upper surface 32 of the truncated cone.
[0035]
Next, the injection port 14 will be considered more specifically. The shape of the injection port 14 is not particularly limited, but for general use, it is preferable that the cross section be any one of a substantially circular shape, a substantially triangular shape, a substantially rectangular shape, and a slit shape. For special applications, for example, a star shape can be used. The following is shown in the figure.
[0036]
(A), (b), (c), (d), and (e) of FIG. 10 are diagrams showing various cross-sectional shapes of the injection port 14.
[0037]
10A, a substantially circular (including elliptical and donut-shaped) jet is obtained, FIG. 10B shows a substantially triangular jet, and FIG. 10C shows a substantially rectangular jet. According to (d), a slit-shaped jet is obtained. According to (e), a star-shaped jet can be obtained.
[0038]
Finally, peripheral devices of the air blast device will be described.
[0039]
FIG. 11 is a diagram schematically showing peripheral devices of the air blast device. This drawing is based on the configuration of FIG.
[0040]
In the figure, reference numeral 41 denotes a high-pressure air tank, which is connected to the supersonic nozzle 11. Reference numeral 42 denotes a storage tank for the spray, which is connected to each spray supply port 12. The inside of the storage tank 41 may be at atmospheric pressure. In this figure, the tank 41 and the tank 42 are drawn as being directly connected to the corresponding nozzle 11 and supply port 12, respectively. However, in reality, these are connected via a pipe. As described above, the air blast device of the present invention can be small and portable, and in that case, it is desirable to make the air blast main body handy by connecting via the pipe. . In the prototype example, the outer diameter of the induction mixing chamber 13 could be 5 to 30 cm. Actually, the volume of the chamber 13, the pressure of high-pressure air, and the like are appropriately selected in addition to the outer diameter of the air blast according to the use of the air blast. The feature of the nozzle 11 is that a uniform flow of supersonic air is obtained and the blast effect is remarkably enhanced.
[0041]
In this case, as the pressure of the high-pressure air increases, the temperature of the supersonic airflow at the outlet of the supersonic nozzle 11 rapidly cools due to adiabatic expansion. Then, if used as it is, the surface treatment of the object can be performed by the quenching effect. Further, if the high-pressure air press-fitted from the nozzle 11 is previously heated to a high temperature equal to or higher than the dried normal temperature, condensation can be prevented. As the surface treatment of the object by the quenching effect, for example, when the coating of the cable is surface-treated by the quenching effect, the coating can be easily broken. For this reason, the waste cable can be separated into a copper wire portion and a covering portion, and the copper wire portion can be easily reused.
[0042]
Also, it is desired that the supersonic air flow is a uniform flow. An apparatus example for this is shown in the figure.
[0043]
FIG. 12 is a diagram showing a modification of FIG. A notable part in this figure is a rectifying cylinder 45 introduced instead of the high-pressure air tank 41 in FIG.
[0044]
That is, in this modified example, the pressurized air supplied from the outside, for example, the compressor 46 is maintained at a constant pressure at the inlet 48 of the supersonic nozzle, for example, by the action of the pressure regulating valve 47, and the above-mentioned uniform flow of the supersonic air The flow rectifying cylinder 45 for obtaining the flow 17 is further provided.
[0045]
【The invention's effect】
As described above, according to the present invention, an entirely new air blast device is realized, which has a much higher performance than the conventional air blast device, and therefore can speed up the processing. Further, by appropriately adjusting the injection port 14, the injection material, and the mixed air flow 15, it is possible to realize fine processing as in the case of using a so-called laser knife.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the principle configuration of the present invention.
FIG. 2 is a perspective view showing Embodiment 1 of the present invention.
3A is a front view of FIG. 2 as viewed from an arrow A, and FIG. 3B is a front view of FIG. 2 as viewed from an arrow B.
FIG. 4 is a perspective view showing a second embodiment of the present invention.
5A is a front view of FIG. 4 as viewed from an arrow A, and FIG. 5B is a front view of FIG. 4 as viewed from an arrow B.
FIG. 6 is a perspective view showing a third embodiment of the present invention.
7A is a front view of FIG. 6 as viewed from an arrow A, and FIG. 7B is a front view of FIG. 6 as viewed from an arrow B.
FIG. 8 is a perspective view showing a fourth embodiment of the present invention.
9A is a front view of FIG. 8 as viewed from an arrow A, and FIG. 9B is a front view of FIG. 8 as viewed from an arrow B.
10 (a), (b), (c), (d) and (e) are views showing various cross-sectional shapes of the injection port 14. FIG.
FIG. 11 is a diagram schematically showing peripheral devices of the air blast device.
FIG. 12 is a diagram showing a modification of FIG. 11;
FIG. 13 is a view showing a typical principle configuration of a general air blast device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Air blast apparatus 11 ... Supersonic nozzle 12 ... Jet supply port 13 ... Induction mixing chamber 14 ... Injection port 15 ... Mixed air flow 16 ... Object 17 ... Supersonic air flow 18 ... Induction 21, 31 ... Bottom 22, 32 top surface 23, 33 side surface 45 rectifying cylinder

Claims (9)

A supersonic nozzle for generating a supersonic airflow;
An ejector supply port for supplying an ejector,
The supersonic air flow from the supersonic nozzle and the jet from the jet supply port are allowed to flow, and the jet is mixed with the supersonic air by induction to form a mixed air flow. An induction mixing chamber to generate;
An injection port for causing the mixed air flow generated in the induction mixing chamber to collide with an object to be blasted;
An air blast device comprising: The air blast device according to claim 1, wherein a plurality of the jet supply ports are provided for the induction mixing chamber. The air blast apparatus according to claim 1, wherein the induction mixing chamber has a substantially cylindrical shape, and the jet supply port is provided on at least one of a bottom surface and a side surface of the substantially cylindrical shape. The air blast apparatus according to claim 1, wherein the induction mixing chamber has a substantially truncated cone, and the jet supply port is provided on at least one of a bottom surface and a side surface of the substantially truncated cone. The air blast device according to claim 3, wherein the injection port is provided on an upper surface of the substantially cylinder. The air blast device according to claim 4, wherein the injection port is provided on an upper surface of the substantially truncated cone. The air blast device according to claim 1, wherein the injection port has any one of a cross section of a substantially circular shape, a substantially triangular shape, a substantially rectangular shape, and a slit shape. The air blast apparatus according to claim 1, wherein the high-pressure air press-fitted from an inlet of the supersonic nozzle to generate the supersonic air flow is a dried high-temperature air at a normal temperature or higher. . The rectification cylinder for maintaining pressurized air supplied from the outside at a constant pressure at the inlet of the supersonic nozzle and obtaining a uniform supersonic airflow is further provided. Air blasting equipment.

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