JP2009148722A - In-gas cavitation jet nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-gas cavitation jet nozzle easy to be adjusted for stably generating cavitation and made compact in the nozzle surrounding. <P>SOLUTION: The in-gas cavitation jet nozzle for generating cavitation in gas comprises a high pressure water supply pipe having a high pressure water jetting port for jetting high pressure water at the tip end part and a low pressure water supply pipe having a low pressure water jetting port installed around the high pressure water jetting port for jetting low pressure water concentrically around the high pressure water as a center and the low pressure water supply pipe is installed along the axial line of the high pressure water supply pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in an air cavitation jet nozzle.

  A method and apparatus for generating cavitation in the air by concentrically injecting low-pressure water around high-pressure water has already been reported. For example, the liquid flow is ejected from the first and second ejection ports of the nozzle located in the atmosphere, and the first liquid flow ejected from the first ejection port is locally ejected from the second ejection port. Surrounded by a second liquid stream that forms a liquid environment, the first liquid stream is faster than the second liquid stream and contains cavitation bubbles, and these first and second liquid streams are brought into the atmosphere. An impact force generated by the collapse of cavitation bubbles is generated on the surface of a workpiece by being applied to the surface of a certain metal material (see, for example, Patent Document 1). In addition, air cavitation has a processing capacity 10 times or more larger than underwater jet cavitation (see, for example, Patent Document 2).

  The impact force due to the collapse of cavitation bubbles is used for various purposes. For example, in addition to improving the residual stress of metal materials in Patent Document 1, the surface of mechanical parts such as gears, springs, molds, etc. are modified and washed (for example, see Patent Document 2), concrete, stone It can be used for excavation of metal etc.

  FIG. 4 is an explanatory view showing a nozzle configuration of a conventional air cavitation jet nozzle. As shown in the figure, as a conventional air cavitation jet nozzle 50, the low-pressure water 51 normally flows in a direction perpendicular to the nozzle 53 of the high-pressure water 52, and thereafter, is bent 90 degrees and injected.

Japanese Patent No. 2957976 JP 2003-62492 A

  By the way, in such an air cavitation jet nozzle, it is difficult for cavitation to occur uniformly, and it is difficult to adjust the low-pressure water supply amount and the nozzle tip itself in order to generate stable cavitation. In such a case, there was a situation that could not be dealt with without changing the structure itself in the nozzle tip in accordance with the change in the amount of low-pressure water supply.

  In practical terms, the nozzle unit is large because of the hose for introducing low-pressure water, and a space for handling the low-pressure hose is necessary when moving the nozzle. Room, processing room, etc.) must be secured. Further, it is difficult to arrange a plurality of nozzles. In addition, the new use of the air cavitation jet device has been limited.

  In view of these, the present invention provides an air cavitation jet nozzle that is easy to adjust for generating stable cavitation and that is compact around the nozzle.

The air cavitation jet nozzle according to the first aspect of the present invention includes a high-pressure water supply conduit having a high-pressure water injection port for injecting high-pressure water at a tip portion, and a high-pressure water nozzle arranged around the high-pressure water injection port. In the air cavitation jet nozzle that has a low-pressure water supply pipe provided at the tip with a low-pressure water injection port that injects low-pressure water concentrically around water, and generates cavitation in the air,
The low-pressure water supply conduit is provided along the axis of the high-pressure water supply conduit.

  An air cavitation jet nozzle according to a second aspect of the present invention is the low-pressure water supply conduit according to the first aspect, wherein the low-pressure water supplied is a flow with less bias along the axis of the high-pressure water supply conduit. One or more rectifying means are provided.

  An air cavitation jet nozzle according to a third aspect of the present invention is the air cavitation jet nozzle according to the first or second aspect, wherein the low-pressure water supply conduit of the high-pressure water supply conduit from the rear end side of the rear end of the high-pressure water supply conduit. It is characterized by being supplied along the axis.

  The air cavitation jet nozzle according to the invention described in claim 4 is capable of entering and exiting the edge of the low-pressure water injection port with respect to the edge of the high-pressure water injection port according to any one of claims 1 to 3. Further, high-low pressure water injection port holding means for holding is provided.

The in-air cavitation jet nozzle according to the invention described in claim 5 is the high-low pressure water jet holding means according to claim 4,
A nozzle portion provided with a counterbore-shaped guide hole capable of nesting the end portion of the low-pressure water supply conduit and the low-pressure water injection port;
A ring portion having an outer shape that can be attached to the inner shape of the guide hole, an inner shape that is flush with the low-pressure water supply conduit, and a predetermined width length;
Fixed holding means for holding the nozzle portion fixed to the low-pressure water supply conduit;
The ring portion is butted against an end surface of the low-pressure water supply conduit and a seat portion of the guide hole.

  ADVANTAGE OF THE INVENTION This invention has the effect that the adjustment for generating the stable cavitation is easy, and also the air cavitation jet nozzle which makes the nozzle periphery compact can be obtained.

  In the present invention, a high-pressure water supply conduit having a high-pressure water injection port for injecting high-pressure water is provided at the tip, and low-pressure water is injected around the high-pressure water injection port in a concentric manner around the high-pressure water. An air cavitation jet nozzle for generating cavitation in the air, wherein the low pressure water supply conduit is provided along the high pressure water supply conduit. It is what. As a result, stable cavitation can be generated, and an air cavitation jet nozzle can be obtained in which the periphery of the nozzle is compact.

  That is, in the conventional cavitation jet nozzle, the low-pressure water flows in a direction perpendicular to the nozzle of the high-pressure water at the tip of the nozzle and is bent 90 degrees and is jetted. The injection amount of the low-pressure water surrounding the surrounding area is uneven, and the balance of the injection amount is lost, so that the occurrence of cavitation is not uniform. For this reason, it is difficult to adjust the low-pressure water supply amount and the nozzle tip itself in order to generate stable cavitation.

  In the air cavitation jet nozzle of the present invention, the low-pressure water supply conduit is provided along the axis of the high-pressure water supply conduit, so that the low-pressure water is supplied along the injection direction of the high-pressure water. Thereby, even if the supply amount of the low-pressure water is changed, the injection amount of the low-pressure water uniformly surrounding the high-pressure water is not easily biased, and stable cavitation can be generated.

  In addition, since the low-pressure water supply conduit is provided along the axis of the high-pressure water supply conduit, the space for handling the low-pressure hose at the nozzle tip, which was essential for conventional nozzles, is no longer required. Therefore, it is not necessary to secure a large injection space (reforming chamber, cleaning chamber, processing chamber, etc.). In addition, a plurality of nozzles can be easily arranged, and there is an advantage that a new application of the air cavitation jet apparatus can be developed.

  Since the low-pressure water supply conduit of the present invention is provided along the axis of the high-pressure water supply conduit, it is difficult for the injection amount of the low-pressure water to be biased and stable cavitation can be generated. More preferably, the low pressure water supply conduit is provided with one or more rectifying means that make the supplied low pressure water a less biased flow along the axis of the high pressure water supply conduit, thereby providing a flow bias in the low pressure water supply conduit. And stable cavitation can be generated.

  As the rectifying means, for example, a plate member arranged so as to block the flow path of the low-pressure water supply conduit, a rectifying plate provided with a plurality of communication holes, a long member arranged along the flow of low-pressure water, or a number of pipes A rectifying material that is bundled is used. When arranging a plurality of rectifying plates in the low-pressure water supply conduit, it is preferable to shift the flow lines of the low-pressure water passing through the communicating holes by shifting the arrangement of the opposing communicating holes of the adjacent rectifying plates. Measures will be taken such as not causing bias in the flow of low-pressure water in the constant-pressure water supply conduit.

  In the high-pressure water supply conduit of the present invention, several hundred to several tens of MP of high-pressure water flows, and the diameter of the injection nozzle is several mm to 0.00 mm. Since it is several millimeters, even if the high-pressure water supply conduit is short, the instability of cavitation due to the uneven injection amount is small. Therefore, it is not necessary to take a long high-pressure water supply conduit as in the prior art, and about several tens of centimeters is sufficient. Therefore, more preferably, the low-pressure water supply conduit is supplied along the axis of the high-pressure water supply conduit from the rear end side of the rear end of the high-pressure water supply conduit.

  A conventional low-pressure water supply pipe is not connected to the nozzle tip of the present invention. For this reason, the degree of freedom of the nozzle tip is also increased, and it is possible to hold the edge of the low-pressure water injection port so that it can enter and exit the edge of the high-pressure water injection port, which could not be changed in the past. It becomes. Preferably, a high-low pressure water injection port holding means for holding the edge of the low-pressure water injection port so as to be able to enter and exit from the edge of the high-pressure water injection port is further provided. The amount of erosion due to cavitation, that is, the power of cavitation changes depending on the position where high-pressure water and low-pressure water merge, so the position of the merging point needs to be adjusted. Adjustment is possible.

  As the high / low pressure water injection port holding means, either one of the part provided with the high pressure water injection port or the part provided with the low pressure water injection port is fixed, and the other is fixed to the driving means to change the relative distance. More preferably, the high-low pressure water injection port holding means includes a counterbore-shaped guide hole in which an end edge portion of the low-pressure water supply conduit can be installed in a nested manner and the low-pressure water injection port. A nozzle portion, a ring portion having an outer shape that can be mounted on the inner shape of the guide hole, an inner shape that is flush with the low-pressure water supply conduit, and a predetermined width, and a nozzle portion that is connected to the low-pressure water supply conduit A high-pressure water injection port by attaching a ring portion having an arbitrary width and abutting against the end surface of the low-pressure water supply conduit and the seat portion of the guide hole. Keep the edge of the low-pressure water jet port in and out of the edge of the It is possible.

  FIG. 1 is an explanatory view showing a configuration of an embodiment of an air cavitation jet nozzle according to the present invention, where a is a longitudinal sectional view and b is a side view. 2 is a cross-sectional view of each of the nozzles of FIG. 1. FIG. 2 is a cross-sectional view taken along the line AA, FIG. 2B is a cross-sectional view taken along the line BB, FIG. , E is an EE cross-sectional view.

  As shown in the figure, the aerial cavitation jet nozzle device of the present embodiment is roughly divided into a main body 10, a high / low pressure water supply unit 20 arranged at the upper end of the main body 10, and a lower end of the main body 10. It consists of three with the nozzle part 30 distribute | arranged to. The main body 10 has a double structure of a low-pressure water supply conduit 12 in which low-pressure water flows in the direction of the nozzle portion 30 around the high-pressure water supply conduit 11 in which high-pressure water flows in the direction of the nozzle portion 30.

  The high and low pressure water supply unit 20 includes a low pressure water supply port 21 connected to a low pressure water supply hose (not shown) at the rear end surface, and a high pressure water supply port 22 connected to a high pressure water supply pipe (not shown) on the side surface. As shown in FIG. 2 a, the high-pressure water supply port 22 is supplied from the side surface of the drilling hole 24 that is the rear end portion of the high-pressure water supply conduit 11 of the Z-axis manifold 23. In the Z-axis manifold 23, five communication holes 25 are formed in order to flow low-pressure water from the low-pressure water supply port 21 to the low-pressure water supply conduit 12 of the main body 10. The five communication holes 25 serve as first rectifying means for eliminating the uneven flow of the low-pressure water. The length of the communication hole 25 is 5 times or more of the hole diameter, and the total cross-sectional area of the hole diameter is 60% or more of the low-pressure water supply port area.

  The high / low pressure water supply unit 20 is joined by a butting portion 14 formed at the upper end of the circular tube 13 that is an outer shell of the main body 10. The low-pressure water that has passed through the communication hole 25 of the Z-axis manifold 23 passes through the four communication holes 15 formed in the butting portion 14 as shown in FIG. To be supplied. The four communication holes 15 serve as second rectifying means for eliminating the uneven flow of the low-pressure water. The length of the communication hole is twice or more the hole diameter, and the total cross-sectional area of the hole diameter is 75% or more of the low-pressure water supply port area.

  In the main body 10, the low-pressure water flows in the low-pressure water supply conduit 12 disposed around the high-pressure water supply conduit 11 disposed in the center of the main body 10, and thus is supplied along the injection direction of the high-pressure water. As a result, the flow of low-pressure water is less likely to be biased.

The high-pressure water is jetted from the jet port at a high pressure by gradually reducing the cross section as it flows through the inside of the main body 10 to the downstream side. First, the flow cross section is narrowed by the flange portion 16 disposed at the lower end portion of the circular tube 13 of the main body portion 10. As shown in FIG. 2 c, large and small communication holes 17 and 18 are formed, and the low-pressure water flows slightly by the flange portion 16 to narrow the cross section. The communication holes 17 and 18 serve as a third rectifying means for eliminating the uneven flow of the low-pressure water. The length of the communication hole is at least twice the hole diameter, the total cross-sectional area of the hole diameter is more than 75 percent of the low-pressure water supply port area.

  A holder portion 19 that holds the nozzle portion 30 is attached to the lower end portion of the flange portion 16. Also in this holder part 19, the flow cross section of high pressure water is narrowed. The shaft center portion of the holder portion 19 extends along the high-pressure water supply conduit 11 in the lower end direction, and a high-pressure water nozzle holder portion 31 is mounted so as to cover the extended portion.

  As shown in FIG. 2d, the high-pressure water nozzle holder portion 31 is provided with eight communication holes 35 arranged concentrically around the extending portion of the holder portion 19, so that the low-pressure water flows slightly in cross section. It is narrowed. The eight communication holes 35 serve as a fourth rectifying means for eliminating the uneven flow of the low-pressure water. The length of the communication hole is twice or more the hole diameter, and the total cross-sectional area of the hole diameter is 75% or more of the low-pressure water supply port area.

  Also in the high-pressure water nozzle holder portion 31, the shaft center portion extends along the high-pressure water supply conduit 11 in the lower end direction, and the high-pressure water nozzle 32 is mounted so as to cover the extended portion. An orifice 34 for further narrowing the flow cross section of the high pressure water is attached to the high pressure water injection port 33 at the tip of the high pressure water nozzle 32. As shown in FIG. 2E, the final flow straightening means is just a space around the outer periphery of the high pressure water nozzle, and the length of the space is at least five times the outer diameter of the high pressure water nozzle. Lead to. Moreover, the cross-sectional area of the space is 60% or more of the low-pressure water supply port area.

  A low pressure water nozzle portion 36 is attached to the outer shell portion of the high pressure water nozzle holder portion 31. The tip of the low-pressure water nozzle portion 36 is tapered, and the low-pressure water is jetted concentrically from the low-pressure water jet port 38 at the tip centering on the high-pressure water. The low-pressure water nozzle part 36 is provided with a counterbore-shaped guide hole 37 into which the outer shell part of the high-pressure water nozzle holder part 31 can be installed in a telescopic manner, and a tightening bolt as a fixing and holding means after the telescopic attachment. 39 is tightened to reduce the inner diameter of the guide hole 37 and fixed. The Z-axis manifold 23 and the flange portion 16 hold the high-pressure water supply conduit 11 in the low-pressure water supply conduit simultaneously with the rectifying function.

  Between the lower end edge of the high-pressure water nozzle holder 31 and the seat 41 of the guide hole 37, a ring portion 40 that allows the end of the low-pressure water injection port to enter and exit from the end of the high-pressure water injection port is disposed. The The ring portion 40 includes an outer shape that can be attached to the inner shape of the guide hole 37, an inner shape that is flush with the low-pressure water supply conduit of the high-pressure water nozzle holder portion 31, and a predetermined width.

  A ring part 40 having an arbitrary width is selected and mounted, and the ring part 40 is abutted against the edge surface of the low-pressure water supply conduit of the high-pressure water nozzle holder part 31 and the seat part 41 of the guide hole 37 to tighten the bolts 39. By tightening and fixing, the end edge of the low-pressure water injection port 38 can be held in and out of the end edge of the high-pressure water injection port 33 as shown by the one-dot chain line of the nozzle tip portion of FIG. it can.

  As described above, since the high-pressure water and the low-pressure water are respectively supplied from the high-low pressure water supply unit 20, the pipes and pipes for supplying the high-pressure water and the low-pressure water are two-dimensional and three-dimensional for the air cavitation jet nozzle of the present invention. It can be attached to the moving device to be moved. For this reason, there is no low-pressure water introduction pipe in the injection space (reforming chamber, cleaning chamber, processing chamber, etc.) where the nozzle and the workpiece are opposed, the nozzle periphery becomes compact, and the low pressure when the nozzle moves There is no need for water piping, and there is no need to secure a large injection space.

  FIG. 3 is a diagram showing the amount of erosion of the aluminum plate when the difference between the two exit faces is changed. When the difference is 0, both outlet surfaces are the same surface, and the difference between the nozzle surfaces indicates the difference in the distance at which the outlet surface of the low-pressure nozzle protrudes from the outlet surface of the orifice that is the outlet of high-pressure water. Means that the outlet surface of the low pressure nozzle is located forward (in the direction of the aluminum plate). As shown in FIG. 4, it can be seen that the amount of erosion caused by cavitation, that is, the power changes when the confluence of high-pressure water and low-pressure water changes.

It is explanatory drawing which shows the structure of one Example of the air cavitation jet nozzle of this invention, a figure is a longitudinal cross-sectional view, b figure is a side view. FIG. 2 is a cross-sectional view of each of the nozzles of FIG. 1, wherein a is a cross-sectional view taken along line AA, b is a cross-sectional view taken along BB, c is a cross-sectional view taken along CC, d is a cross-sectional view taken along DD, e FIG. It is a diagram which shows the erosion amount of the aluminum plate at the time of changing the difference of both exit surfaces. It is explanatory drawing which shows the nozzle structure of the conventional air cavitation jet nozzle.

Explanation of symbols

10 ... body part,
11 ... High-pressure water supply conduit,
12 ... Low pressure water supply conduit,
13 ...
14 ... butting part,
15 ... Communication hole,
16 ... flange part,
17 ... Communication hole 18 ... Communication hole,
19 ... Holder part,
20 ... High and low pressure water supply section,
21 ... Low pressure water supply port,
22 ... High pressure water supply port,
23 ... Z axis manifold,
24 ... drilling hole,
25. Communication hole,
30 ... Nozzle part,
31 ... High pressure water nozzle holder,
32 ... High pressure water nozzle,
33 ... High-pressure water jet,
34: Orifice,
35 ... Communication hole,
36 ... Low pressure water nozzle part,
37 ... Guide hole,
38 ... Low pressure water injection port,
39 ... Tightening bolt,
40 ... Ring part,
41 ... the seat,

Claims (5)

A high-pressure water supply conduit having a high-pressure water injection port for injecting high-pressure water at the tip, and a low-pressure water injection port that is arranged around the high-pressure water injection port and injects low-pressure water concentrically around the high-pressure water In the air cavitation jet nozzle that has a low-pressure water supply conduit provided at the tip, and generates cavitation in the air,
An air cavitation jet nozzle, wherein the low-pressure water supply conduit is provided along an axis of the high-pressure water supply conduit.   The said low-pressure water supply conduit is provided with one or more rectifying means for making the low-pressure water to be supplied a flow with little deviation along the axis of the high-pressure water supply conduit. Air cavitation jet nozzle as described.   3. The air cavitation jet according to claim 1, wherein the low-pressure water supply conduit is supplied along the axis of the high-pressure water supply conduit from a rear end side with respect to a rear end of the high-pressure water supply conduit. nozzle.   The high-low pressure water injection port holding means for holding the end edge of the low-pressure water injection port so as to be able to enter and exit from the end edge of the high-pressure water injection port is further provided. Air cavitation jet nozzle described in 1. The high / low pressure water injection port holding means includes:
A nozzle portion provided with a counterbore-shaped guide hole capable of nesting the end portion of the low-pressure water supply conduit and the low-pressure water injection port;
A ring portion having an outer shape that can be attached to the inner shape of the guide hole, an inner shape that is flush with the low-pressure water supply conduit, and a predetermined width length;
Fixed holding means for holding the nozzle portion fixed to the low-pressure water supply conduit;
The air cavitation jet nozzle according to claim 4, wherein the ring portion is abutted against an end surface of the low-pressure water supply conduit and a seat portion of the guide hole.

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