JPH06178953A - Super high pressure water jet nozzle - Google Patents

Abstract

PURPOSE:To increase the convergence of a jet stream to improve the cutting performance in a super high pressure water jet nozzle. CONSTITUTION:An orifice 5 having a narrow pore 5a is provided on a nozzle 2 equipped with a super high pressure water passage 3 into which super high pressure water is introduced at the end of the super high pressure water passage 3. And in the super high pressure water nozzle where super high pressure water is contracted by a through hole 5a of the orifice 5 to jet it, a space part 31 surrounding a jet stream J coaxially with the through hole 5a on the downstream side of the orifice 5 and having a specified volume, a contracted diameter part 32 provided following the downstream end of the space part 31 and given diameter contraction gradually toward the downstream side and a convergent nozzle 33 provided following the downstream end of the contracted diameter part 32 to extend and having a diameter whose size is set 1.5-5 times that of the through-hole 5a of the orifice 5 are provided. Consequently the jet stream J maintains good convergence without the interface turbulence and air mixing after it is jetted from the orifice 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super high pressure water jet nozzle.

[0002]

2. Description of the Related Art Conventionally, there is known a cutting system for cutting a relatively soft material such as leather by using a jet flow (so-called water jet) obtained by an ultra-high pressure water jet nozzle (for example, Japanese Patent Laid-Open No. 2-311300). (See the official gazette),
The cutting performance of the cutting system using such an ultra-high pressure water jet nozzle is largely governed by the quality of the convergence of the jet jetted from the orifice. That is, if the jet converging property is made good and its cross-sectional area is made as small as possible and the cross-sectional shape is made as close to a perfect circle as possible,
The jet energy can be concentratedly applied to the cut portion of the material to be cut to make the cutting width smaller and the cutting depth deeper.

On the other hand, in the ultra-high pressure water injection nozzle, the ultra-high pressure water obtained by the pressure intensifier arranged on the upstream side is introduced, and the ultra high pressure water is contracted in the orifice to inject it as a jet flow. For example, the turbulence of the swirling velocity component or the turbulence of the flow velocity component (Fig.
7 and the flow velocity curve L _{0 in} FIG. 18) is difficult to avoid, but such turbulence of the swirling velocity component or the flow velocity component directly affects the convergence of the jet flow. From the viewpoint of improving the cutting performance, it is important to suppress / remove it as much as possible, that is, to rectify it.

As one method in this case, for example, it is conceivable to lengthen the flow path from the pressure intensifier to the ultra-high pressure water injection nozzle to expect a natural rectifying action in the meantime. The length of the flow path becomes extremely long, which makes it practically useless.

Under these circumstances, for example, Japanese Utility Model Laid-Open No. 3-34848 proposes a rectifying body arranged mainly at the position immediately before the orifice of the ultra-high pressure water injection nozzle to remove the swirling velocity component. Has been done.

[0006]

However, although the conventional high pressure water injection nozzle provided with the flow straightener is intended to suppress the swirling velocity component of the ultra high pressure water by the flow straightener, Since the rectifying body is arranged immediately in front of the orifice so as to rectify it immediately before flowing into the orifice, it cannot be said that the effect of suppressing the turning speed component is sufficient. That is, generally, even if a rectifying body is arranged in the flow, it is not rectified immediately after passing through the rectifying body,
This is because the rectifying effect occurs only after passing some free flow after passing the rectifying body.

Further, the flow resistance is increased by arranging the rectifying body in the flow passage, and the flow velocity distribution is improved to some extent (that is, the non-target state with respect to the flow axis of the flow velocity distribution is improved to be targeted). Although this can be expected, this effect is somewhat diminished by the fact that the rectifying body is arranged immediately in front of the orifice as described above.

Further, the above-mentioned known example is intended to improve the focusing property of the jet by rectifying the ultra-high pressure water before flowing into the orifice, but the focusing property of the jet is deteriorated. The cause is that it exists even after being ejected from the orifice (that is, the jet flow ejected from the orifice undergoes contact turbulence due to contact resistance with air and causes interface turbulence, and air is mixed into the jet flow. Since it tends to be diffused), it is necessary to take measures to suppress the interface turbulence and diffusion of the jet after this injection, but no effective measures have been taken so far for this.

Therefore, the present invention has been made as a provision of an ultrahigh pressure water jet nozzle for improving the focusing performance of a jet flow to improve the cutting performance.

[0010]

As a concrete means for solving such a problem in the present invention, in the invention described in claim 1, ultrahigh pressure water is introduced as illustrated in FIGS. 1 and 2. An orifice 5 having a through hole 5a is provided at the tip of the ultra high pressure water flow path 3 of the nozzle tube 2 provided with the ultra high pressure water flow path 3, and the ultra high pressure water is passed through the through hole 5 of the orifice 5.
In the ultra-high pressure water injection nozzle that is made to contract and inject at a, a space 31 having a predetermined volume surrounding the jet J coaxially with the through hole 5a on the downstream side of the orifice 5.
And a reduced diameter portion 32 which is continuous with the downstream end of the space portion 31 and gradually reduces in diameter toward the downstream side, and a diameter reduced portion 32 which extends continuously with the downstream end of the reduced diameter portion 32 and has a diameter dimension. The focusing nozzle 33 is set to be 1.5 to 5 times as large as the through hole 5a.

In the second aspect of the invention, as shown in FIGS. 3 and 4, the ultrahigh pressure water flow path 3 into which the ultrahigh pressure water is introduced.
An orifice 5 having a through hole 5a is provided at the tip of the ultra high pressure water flow path 3 of the nozzle tube 2 including
An abrasive grain mixing chamber 11 is formed on the downstream side of the orifice 5,
In an ultra-high-pressure water jet nozzle in which abrasive grains are mixed and jetted into the jet stream J jetted from the through hole 5a of the orifice 5, the orifice 5 is passed to an intermediate position between the orifice 5 and the mixing chamber 11. A space 31 having a predetermined volume surrounding the jet J coaxially with the hole 5a, a reduced diameter portion 32 continuous with the downstream end of the space 31 and gradually reduced in diameter toward the downstream side, and the reduced diameter A converging nozzle 33 is provided which extends continuously to the downstream end of the diameter portion 32 and has a diameter dimension set to 1.5 to 5 times that of the through hole 5a of the orifice 5.

According to the third aspect of the present invention, as shown in FIG. 6, a through hole is provided at the tip of the ultra high pressure water flow path 3 of the nozzle tube 2 having the ultra high pressure water flow path 3 into which the ultra high pressure water is introduced. In an ultra-high-pressure water injection nozzle in which an orifice 5 having an orifice 5a is provided, and the ultra-high-pressure water is condensed by the through hole 5a of the orifice 5 and injected, the ultra-high-pressure water flow located upstream of the orifice 5 A rectifying body 21 having a predetermined flow resistance, which is separated from the orifice 5 in the passage 3 by at least a dimension corresponding to the inner diameter D of the ultrahigh pressure water passage 3.
The feature is that 27 is provided.

According to the fourth aspect of the invention, as shown in FIG. 20, a through hole is provided in the tip of the ultra-high pressure water channel 3 of the nozzle tube 2 provided with the ultra-high pressure water channel 3 into which the ultra-high pressure water is introduced. In an ultra-high-pressure water injection nozzle in which an orifice 5 having an orifice 5a is provided, and the ultra-high-pressure water is condensed by the through hole 5a of the orifice 5 and injected, the ultra-high-pressure water flow located upstream of the orifice 5 A rectifying body 21 having a predetermined flow resistance, which is separated from the orifice 5 in the passage 3 by at least a dimension corresponding to the inner diameter D of the ultrahigh pressure water passage 3.
27 to 27, a space 31 having a predetermined volume that surrounds the jet J is provided coaxially with the through hole 5a on the downstream side of the orifice 5, and the downstream side of the space 31 is continuous with the downstream end of the space 31. The diameter-reduced portion 32 that gradually changes its diameter toward the end, and the converging nozzle 33 that extends continuously to the downstream end of the diameter-reduced portion 32 and has a diameter dimension set to 1.5 to 5 times that of the through hole 5a of the orifice 5. It is characterized by having and.

In the invention according to claim 5, as illustrated in FIG. 21, a through hole is provided at the tip of the ultra high pressure water flow path 3 of the nozzle tube 2 having the ultra high pressure water flow path 3 into which the ultra high pressure water is introduced. An orifice 5 having an orifice 5a is provided, and an abrasive grain mixing chamber 11 is formed on the downstream side of the orifice 5 so that the jet stream J jetted from the through hole 5a of the orifice 5 is mixed with the abrasive grain and jetted. In the ultra-high-pressure water injection nozzle, a predetermined distance is set in the ultra-high-pressure water passage 3 located upstream of the orifice 5 from the orifice 5 at least by a dimension corresponding to the inner diameter D of the ultra-high-pressure water passage 3. While rectifying bodies 21 to 27 having flow resistance are provided, a space 31 having a predetermined volume surrounding the jet J coaxially with the through hole 5a of the orifice 5 is provided at an intermediate position between the orifice 5 and the mixing chamber 11. And the A reduced diameter portion 32 that is continuous with the downstream end of the intermediate portion 31 and that gradually decreases in diameter toward the downstream side, and a through hole of the orifice 5 that extends continuously with the downstream end of the reduced diameter portion 32. It is characterized in that a focusing nozzle 33 set to 1.5 to 5 times as large as 5a is provided.

In the invention described in claim 6, FIG. 7 and FIG.
~ As illustrated in FIG. 14, in the ultra high pressure water jet nozzle according to claim 3, 4 or 5, the rectifying body 21, 25 ,.
26 is constituted by a block body having a plurality of through holes 40 to 43 penetrating in the axial direction of the ultra high pressure water flow path 3.

In the invention according to claim 7, as shown in FIGS. 8, 15 and 16, in the ultra high pressure water injection nozzle according to claim 3, 4 or 5, the rectifying bodies 22, 27 are used.
Is configured by bundling a plurality of pipes 44, 44 ,.

In the invention described in claim 8, as illustrated in FIG. 9, in the ultra high pressure water injection nozzle according to claim 3, 4 or 5, the rectifying body 23 is fitted into the ultra high pressure water flow path 3. It is characterized in that nets 46, 46 are attached to the inserted cylindrical body 45 so as to cross the internal passage thereof.

According to a ninth aspect of the invention, FIGS.
As illustrated in claim 3, in the ultra-high pressure water injection nozzle according to claim 3, 4, 5, 6, 7 or 8, the rectifying bodies 25 to 27 are provided.
The flow resistance is set so that the radially outward portion of the ultrahigh pressure water flow path 3 is smaller than the inward portion.

[0019]

With each of the inventions of the present application, the following effects can be obtained by adopting such a configuration.

In the invention according to claim 1, the jet flow J from the through hole 5a of the orifice 5 is jetted forward from the focusing nozzle 33 from the space portion 31 provided coaxially therewith, through the reduced diameter portion 32. However, at this time, since the diameter of the focusing nozzle 33 is set to 1,5 to 5 times the diameter of the through hole 5a,
The jet J passes through the focusing nozzle 33 without coming into contact with it and maintaining a relatively small gap.
At the time of the passage, the ejector effect is generated and the air in the space 31 is sucked to the outside from the focusing nozzle 33, so that the space 31 is negatively pressured. Therefore, first, in the space 31, since the internal pressure is low, the air resistance given to the jet J is reduced, the interface turbulence of the jet J due to the air resistance is reduced, and the air is mixed into the jet J. Suppressed. Further, in the focusing nozzle 33 portion, since the gap between the jet J and the inner peripheral surface of the focusing nozzle 33 is small, air turbulence is small in this gap portion, and the interface turbulence of the jet J is as small as possible. It is tightened. Further, since the reduced diameter portion 32 is provided between the space portion 31 and the focusing nozzle 33, the flow of air flowing across the space portion 31 and the focusing nozzle 33 is adjusted, and Disturbance of the jet interface due to turbulence is suppressed. As a synergistic effect of these, after the jet stream J is jetted from the orifice 5, the jet stream J is jetted toward the member to be cut while maintaining good focusing property without causing much interface turbulence and air mixing, and performs the required cutting work.

According to the second aspect of the invention, since the space portion 31, the reduced diameter portion 32, and the converging nozzle 33 are formed on the upstream side of the abrasive grain mixing chamber 11, the jet flow J ejected from the orifice 5 is formed. The swelling property is maintained good by the action similar to that described above. And in this jet J,
Abrasive grains are mixed in the mixing chamber 11 while being jetted toward the member to be cut after passing through the mixing chamber 11, but in that case, since the jet J itself has a good focusing property, the jet J The mixing of the abrasive grains into the entire surface is uniformly and smoothly carried out.

According to the third aspect of the present invention, the rectifying bodies 21 to 27 having a predetermined flow resistance are provided at positions separated by at least a dimension corresponding to the inner diameter D of the ultrahigh pressure water channel 3 in the ultrahigh pressure water channel 3. Since it is provided, the ultra high pressure water flow path 3
The ultra-high pressure water introduced with a disturbed flow velocity distribution is subjected to a predetermined flow resistance when passing through the rectifying bodies 21 to 27, so that the flow velocity distribution is as much as possible.
(That is, the axis of the orifice 5) is rectified as desired. Accordingly, when the rectified ultra-high pressure water having the axially symmetrical flow velocity distribution is further contracted in the orifice 5, the diameter of the ultra-high pressure water flowing into the orifice 5 from the periphery thereof is increased. Since the directional velocity component is substantially uniform over the entire circumference, the contraction action is good, and therefore the jet J injected from the through hole 5a of the orifice 5 has a high focusing property.

In the inventions described in claims 4 and 5, on the upstream side of the orifice 5, the rectifying bodies 21 to 27 perform the rectifying action as described above to provide the jet J with high focusing property, while the orifice 5 of the orifice 5 is provided. On the downstream side, the space portion 31, the reduced diameter portion 32, and the focusing nozzle 33 perform the action of maintaining the focusing property for the jet J as described above, so that the jet J secures a higher focusing property and It will be jetted toward the member to be cut while maintaining it.

According to the sixth aspect of the present invention, in addition to the above-mentioned or the actions described above, the rectifying body 21, 2 is provided.
Since a plurality of through holes 40 to 43 penetrating in the axial direction of the ultra high pressure water flow path 3 are formed in 5, 26, when the ultra high pressure water passes through each of the through holes 40 to 43, its flow resistance As a result, the targeting of the flow velocity distribution on the axis is promoted, and at the same time, the turning velocity component is reduced as much as possible. Therefore, the contraction action in the orifice 5 can be improved by the amount of the reduced swirl velocity component.

In the invention according to claim 7, the rectifying body 22,
Since 27 is constituted by bundling pipes 44, 44, ..., In the same manner as described above, in the rectifying bodies 22, 27, the targeting of the flow velocity distribution of the ultrahigh pressure water and the action of reducing the swirling velocity component are achieved. And is done.

In the invention according to claim 8, the rectifying body 23
Is composed of a tubular body 45 and a net 46 attached so as to traverse the internal passage thereof, the rectifying body 23 is mainly the axis of the flow velocity distribution of the ultra-high pressure water in the same manner as described above. It acts to promote targeting.

In the invention according to claim 9, the rectifying body 25
Since the flow resistances of ~ 27 are changed in the radial direction so as to become smaller toward the outer side in the radial direction of the ultra high pressure water flow path 3, the rectified ultra high pressure water after passing the rectifying bodies 25 to 27 is The flow velocity distribution is such that the flow velocity increases toward the outer circumference. Therefore, at the time of contraction in the orifice 5, the radial velocity component of the flow that wraps around from the outer periphery of the ultrahigh pressure water flow path 3 to the orifice 5 side becomes larger,
The contraction action is promoted and the converging property of the jet J is further enhanced.

[0028]

Therefore, according to the ultra-high pressure water jet nozzles of the inventions of the present application, the following effects can be obtained respectively.

(A) According to the ultrahigh-pressure water jet nozzles of the first and second aspects, with respect to the jet stream J after being jetted from the orifice 5, the jet stream J causes interface disturbance due to air resistance or air is mixed. In order to prevent the focusing property from being hindered as much as possible, the jet flow J can be used for cutting the member to be cut while maintaining its high focusing property. The cutting performance can be improved to that extent.

(B) According to the ultra-high pressure water injection nozzle of the third aspect, the rectifying action is applied to the ultra-high pressure water before the contraction action in the orifice 5 so that the flow velocity distribution is axially symmetrical. By promoting the contraction action, the orifice 5
Since the jet J having a good focusing property is jetted from the above, the jet J having a high focusing property can be used for cutting, and the cutting performance can be enhanced.

(C) According to the ultra-high pressure water injection nozzles of claims 4 and 5, the flow straighteners 21 to 27 are provided in the ultra-high pressure water passage 3.
By providing the above, the high converging property of the jet flow J ejected from the orifice 5 is ensured, and the factor that impedes the converging property of the jet flow J after the ejection is eliminated as much as possible. Therefore, the jet stream J is jetted to the member to be cut while maintaining a higher focusing property, and an effect that further improvement in cutting performance can be expected can be obtained.

(D) According to the ultra-high pressure water injection nozzles of claims 6, 7 and 8, the flow straighteners 21 to 21 each having a simple structure are provided.
By means of 27, the effect described in (b) above can be obtained, and the effect that it can contribute to the simplification of the structure of the device can be obtained. Further, in particular, according to the ultra-high pressure water injection nozzle according to claims 6 and 7, the flow straighteners 21, 22, 25 to 27 are provided.
Exerts the effect of reducing the swirl velocity component in addition to the effect of making the flow velocity distribution axially symmetrical, so that the contraction effect is further improved, and the effect of further improving the focusing property of the jet J can be expected. There is something.

(E) According to the ultra-high pressure water injection nozzle of the ninth aspect, the flow resistance of the rectifying bodies 21 to 27 is reduced toward the outer circumference of the ultra-high pressure water flow path 3 so that the radial component at the time of contraction is reduced. By increasing the number of the jets to further promote the contraction action, the converging property of the jet J ejected from the orifice 5 can be further enhanced, and the cutting performance by the jet J can be further improved. Is. Also,
By appropriately changing and setting such a change state of the flow resistance, it is possible to always ensure a high jet converging property even in various ultra-high pressure water jet nozzles in which the diameter of the orifice 5 (that is, the diameter of the through hole 5a) is different. It is also possible to contribute to the improvement of versatility.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The ultrahigh pressure water jet nozzle of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

First Embodiment FIG. 1 shows an ultra-high pressure water injection nozzle 1 according to an embodiment of the present invention as set forth in claim 1 of the present application. In FIG. The nozzle tubes 4 forming the water flow path 3 are clamp members screwed to the tip end of the nozzle tube 2, and the clamp member 4 allows the orifice holder 6 having the orifice 5 to flow in the super high pressure water flow. It is fixed to the tip of the passage 3. Therefore, when the ultra-high pressure water is introduced into the ultra-high pressure water flow path 3, the ultra-high pressure water is contracted in the orifice 5 and jetted forward as a jet J.

In this case, if the jet J is injected from the orifice 5 through the atmosphere as it is, even if a high focusing property is secured when the jet J is injected from the orifice 5, the jet J is contacted with the air by the resistance. As described above, the interface is disturbed on the surface or the air is mixed and gradually diffused to lower the focusing property, resulting in the reduction of the cutting performance by the jet J.

Therefore, in the embodiment,
By applying the invention according to claim 1 of the present application, a space portion 31 of a predetermined volume communicating with the orifice 5 is provided at a position just in front of the orifice holder 6 of the clamp member 4, and a leading end of the space portion 31 is continuous. Then, a tapered surface-shaped reduced-diameter portion 32 that gradually changes in diameter and a small-diameter focusing nozzle 33 that continuously extends to the small-diameter end of the reduced-diameter portion 32 are provided coaxially with the through hole 5a of the orifice 5. While forming the focusing nozzle 33, the diameter of the focusing nozzle 33 is set to be 1,5 to 5 of the diameter of the through hole 5a of the orifice 5.
It is set to double the range.

When the space portion 31, the reduced diameter portion 32 and the focusing nozzle 33 are formed on the downstream side of the orifice 5 in this manner, the jet J jetted from the through hole 5a of the orifice 5 passes through these portions 31 to 33. When jetted forward, the diameter of the focusing nozzle 33 is set to 1,5 to 5 times the diameter of the through hole 5a. Therefore, the jet J does not come into contact with the inside of the focusing nozzle 33 and is compared. When passing through the jet J, an ejector effect is generated and the air in the space 31 is sucked to the outside from the focusing nozzle 33, so that the inside of the space 31 becomes negative pressure. To be done.

Therefore, first, in the space 31,
Since the internal pressure is low, the air resistance applied to the jet J is reduced, the interface turbulence of the jet J resulting from this is reduced, and the mixing of air into the jet J is suppressed. In the focusing nozzle 33 portion, the jet J and the focusing nozzle 33
Since the gap between the inner peripheral surface of the jet nozzle and the inner peripheral surface of the jet nozzle is small, the turbulence of the air is small in this gap portion, and the turbulence of the interface of the jet J is minimized. Further, since the reduced diameter portion 32 is provided between the space portion 31 and the focusing nozzle 33, the flow of air flowing across the space portion 31 and the focusing nozzle 33 is adjusted, and The disturbance of the jet interface due to the turbulence is suppressed.

As a synergistic effect of these, the jet flow J does not cause much interface turbulence or air mixing after being jetted from the orifice 5 and maintains a good focusing property which is almost the same as when jetted from the orifice 5. It will be jetted toward the member to be cut. Therefore, by performing the required cutting work by using the jet stream J having a high focusing property, it becomes possible to perform cutting with a small cutting width and a large cutting depth, and the cutting performance is improved.

According to the experiments conducted by the present inventors, the diameter of the focusing nozzle 33 is 1,5 with respect to the diameter of the through hole 5a of the orifice 5.
When it is less than twice, the jet J adheres to the inner wall of the focusing nozzle 33 and the cutting performance deteriorates on the contrary, and when it is more than 5 times, the effect of providing the focusing nozzle 33 and the like cannot be obtained. Based on this, the diameter of the focusing nozzle 33 was set to 1.5 to 5 times the diameter of the through hole 5a, but the most remarkable effect was obtained in the vicinity of 3 times. Therefore, as data showing that the effect of improving the cutting performance is obtained, the orifice diameter is 0.25 mm and the focusing nozzle diameter is 0.
Limit cutting depth in two cases: 75 mm (diameter magnification is 3 times), orifice diameter is 0.3 mm and focusing nozzle diameter is 0.75 mm (diameter magnification is 2.5 times). This is shown in FIG. 5 in comparison with the conventional one in which the focusing nozzle 33 and the like are not provided. It can be seen from FIG. 5 that the cutting depth is improved by about 5% as compared with the conventional one in each case.

Second Embodiment FIG. 2 shows an ultra-high pressure water jet nozzle 1 according to an embodiment of the invention described in claim 1 of the present application. This embodiment should be called a modification of the first embodiment, and the first embodiment has the space portion 31, the diameter reducing portion 32, and the focusing nozzle 33 clamped together. In contrast to being formed on the member 4 side, each of these parts 31 to 33 is integrally formed in the orifice holder 6. Therefore, it is needless to say that the same effects as those of the first embodiment can be expected in this embodiment, but in addition to this, in the case of this embodiment, the orifice 5 and the space portion are also provided. 31 is the orifice holder 6
Since it is integrated in the inside, the diameter of the focusing nozzle 33 can be set in accordance with the diameter of the through hole 5a of the pre-orifice 5, so that as in the first embodiment. There is no need to consider the combination when working, as in the case where both are formed separately, workability is that much,
There is an advantage that the handleability is good.

Third Embodiment FIG. 3 shows an ultrahigh pressure water jet nozzle 1 according to an embodiment of the present invention as set forth in claim 2 of the present application. The ultra-high pressure water nozzle 1 of this embodiment is provided with a mixing chamber 11 and an abrasive nozzle 13 on the downstream side of the orifice holder 6 and supplies the jet J from the orifice 5 from the abrasive grain supply chamber 14 in the mixing chamber 11. The abrasive particles to be cut are mixed with each other, and the abrasive particles are jetted together with the jet stream J to the member to be cut for cutting. And in this embodiment,
By applying the invention described in claim 2, the space portion 31, the reduced diameter portion 32, and the focusing nozzle 33 are formed between the orifice holder 6 and the mixing chamber forming member 12. That is, the clamp member 4 forms a space 31 on the downstream side of the orifice 5, and a reduced diameter portion 32 and a focusing nozzle 33 are formed on the end wall of the mixing chamber forming member 12.

With this structure, the jet J maintains a high focusing property by the same action as in the case of the first embodiment described above, but the mixing chamber 1 is provided for the jet J having a good focusing property.
When the abrasive grains are mixed in No. 1, the abrasive grains are mixed into the jet J uniformly and smoothly from the entire area of the peripheral surface thereof. Therefore, by jetting the jet stream J in which the abrasive grains are mixed as uniformly as possible to the member to be cut, higher cutting performance is ensured.

Fourth Embodiment FIG. 4 shows an ultrahigh pressure water nozzle 1 according to an embodiment of the invention as defined in claim 2 of the present application. The ultra-high pressure water nozzle 1 of this embodiment is a modification of the third embodiment,
The one provided with the mixing chamber 11 and the abrasive nozzle 13,
The space portion 31 and the reduced diameter portion 32 are the same as those in the second embodiment.
The focusing nozzle 33 and the focusing nozzle 33 are integrally formed in the orifice holder 6. Therefore, in this embodiment, the same operational effects as those of the second and third embodiments can be obtained.

Fifth Embodiment FIG. 6 shows an ultrahigh pressure water nozzle 1 according to an embodiment of the present invention as defined in claims 3 and 6 to 9 of the present application. The ultra-high pressure water nozzle 1 of this embodiment has a basic structure in which an orifice holder 6 having an orifice 5 is fixedly held by a clamp member 4 at the tip of a nozzle tube 2 having an ultra-high pressure water flow path 3. The ultra high pressure water nozzle 1 of this embodiment is the same as that of the above example, but differs from the above examples in that the nozzles of each of the above examples show the convergence of the jet J after being ejected from the orifice 5. In contrast to the maintenance, this embodiment has a point that it acts on the ultra-high pressure water before being ejected from the orifice 5 to enhance the focusing property of the jet J itself.

Specifically, the rectifying body 21 having the structure as shown in FIGS. 7 to 16 is provided in the ultra high pressure water flow path 3 and at a position separated from the orifice 5 by at least the inner diameter dimension of the ultra high pressure water flow path 3. To 27 are inserted and configured. In the rectifiers 21 to 27, the ultrahigh pressure water introduced into the ultrahigh pressure water flow path 3 has a swirl velocity component, and the flow velocity curve L ₀ thereof is on the axis of the ultrahigh pressure water flow path 3 as shown in FIGS. 17 and 18. On the other hand, in view of the non-symmetry, these are provided so as to suppress or remove them to promote the contraction action in the orifice 5 of the ultra-high pressure water, thereby enhancing the converging property of the jet J.

Here, in this embodiment, the rectifying body 21
The distance Dm from the orifice 5 to 27 is set to be larger than the inner diameter D of the ultra high pressure water flow path 3 (that is, (D / Dm) = D
m ′> 1), which is based on the experimental results of the inventors of the present application. That is, the inventors of the present application presuppose a well-known matter that the rectifying effect by the rectifying body is not immediately downstream of the rectifying body but the downstream side with a certain distance from the rectifying body, as described above. On the orifice diameter
By using two types of orifices A and B having different diameters (that is, the diameter of the through hole 5a of the orifice 5), the above dimensional ratio Dm is variously changed, and the cutting depth in that case is measured, and this is provided with a rectifying body. Compared to the case without. The results of this experiment are shown in FIG.
Is shown in.

From this experimental result, the cutting depth changes depending on the orifice diameter, but in any case, the cutting depth increases in the range of the dimension ratio Dm> 1 as compared with the case without the flow straightener. I know what to do. Therefore, in this embodiment, the dimensional ratio Dm is set to 1 or more.

The operation and effects of the rectifying body having the structure shown in FIGS. 7 to 16 will be described below.

I) When the rectifying body 21 shown in FIG. 7 is applied The rectifying body 21 shown in FIG. 7 penetrates in the axial direction into a columnar body having an outer dimension that can be inserted into the ultrahigh pressure water flow path 3. A plurality of through holes 40, 40, ... Having the same diameter are arranged as uniformly as possible over the entire area of the end surface. Therefore,
When the rectifying body 21 is arranged in the ultra-high pressure water flow path 3 and the ultra-high pressure water flows from one end side to the other end side, the ultra-high pressure water passes through the through holes 40, 40 ,. As a result, the rectifying body 21 imparts a predetermined flow resistance and linearity (in other words, the swirling velocity component of the ultrahigh pressure water is reduced).

Looking at the flow resistance of these two actions, as shown in FIG. 17, the upstream side of the rectifying body 21 is non-uniform as shown by the flow velocity curve L ₀ , and the axis of the ultrahigh pressure water flow path 3 is not uniform. On the other hand, the flow velocity distribution in the asymmetrical state is subjected to a predetermined flow resistance by the rectifying body 21, so that on the downstream side of the rectifying body 21, as shown by the flow velocity curve L ₁ , the flow path of the ultrahigh pressure water channel 3 is The velocity distribution is symmetrical with respect to the axis and is almost uniform in the entire cross-sectional direction. As a result, when this ultra-high pressure water is subjected to a contraction action in the orifice 5, the radial velocity component V ₁ of the flow flowing into the orifice 5 from the periphery thereof is different between the flows from the same radial position. Almost uniform over the entire circumference. Therefore, in the orifice 5, a contracted flow is generated from the periphery thereof in a uniform state, so that the jet J from the orifice 5 has a cross section as close to a perfect circle as possible without being biased to one side of the through hole 5a. It will have a high level of focusing.

The other effect of the rectifying body 21, that is, the effect of suppressing the turning speed component, is reduced by the rectifying body 21 before reaching the orifice 5. Directional velocity component V ₁
Is increased, and the converging property of the jet J can be further improved.

The diameter dimension of the through hole 40 of the rectifying body 21,
The number to be formed or the axial length thereof is appropriately set according to the size of the orifice through hole 5a, the inner diameter of the ultrahigh pressure water flow path 3, and the like.

Ii) When the rectifying body 22 shown in FIG. 8 is applied The rectifying body 22 shown in FIG. 8 is formed by bundling a plurality of pipes 44 each having a predetermined diameter. Similar to the rectifying body 21 of FIG. 7, the super-high-pressure water is given a predetermined flow resistance to make the flow velocity distribution uniform and axially symmetrical, and to reduce the swirling velocity component of the super-high-pressure water. The same operational effect as described in i) above can be obtained.

Iii) When the rectifying body 23 shown in FIG. 9 is applied The rectifying body 23 shown in FIG. 9 is constructed by attaching nets 46, 46 to the upper and lower ends of a cylindrical body 45 having a predetermined length. . In the case of the rectifying body 23, unlike the rectifying body 21 and the rectifying body 22, there is almost no action of reducing the turning speed component, and the main purpose is to improve the flow velocity distribution by imparting flow resistance. Therefore, although the performance is inferior because there is no action of reducing the turning speed component, there is an advantage that the structure is simpler than that of the rectifying body 21 or the rectifying body 22.

Iv) When the rectifying body 24 shown in FIG. 10 is applied The rectifying body 24 of FIG. 10 is formed by molding a porous material into a short column shape. This rectifying body 24, like the rectifying body 23 shown in FIG. 9, is mainly intended to improve the flow velocity distribution by imparting flow resistance.

V) When the rectifying body 25 shown in FIGS. 11 and 12 is applied The rectifying body 25 shown in FIGS. 11 and 12 corresponds to a modification of the rectifying body 21 shown in FIG. Of the plurality of through holes 41 to 43 formed through in the axial direction, the diameter of the through hole 41 formed near the outer circumference is maximized, and that of the through hole 43 formed in the axial center portion is minimized, The through hole 42 located in the middle of these is set to have an intermediate size. By doing so, the rectifying body 25
The distribution resistance differs in the radial direction, and the distribution resistance is reduced toward the outer periphery.

When the rectifying bodies 25 having different flow resistances in the radial direction are arranged in the ultrahigh pressure water flow path 3 as described above, the flow velocity distribution on the downstream side of the rectifying body 25 is a flow velocity curve L ₂ as shown in FIG. As shown, although the flow velocity distribution is symmetrical with respect to the axis of the ultra high pressure water flow path 3, the flow velocity increases toward the outer periphery of the ultra high pressure water flow path 3. Therefore, when the super high pressure water having such a flow velocity distribution biased toward the outer peripheral side is subjected to the contraction action in the orifice 5, the radial velocity component V _{1 of the} flow flowing into the orifice 5 side through the outer peripheral side is shown in FIG. This is even larger than the case, and as a result, the contracting action is further promoted, and the converging property of the jet J is further enhanced.

Vi) When the rectifying body 26 shown in FIG. 14 is applied The rectifying body 26 shown in FIG. 14 is a further development of the rectifying body 25 shown in FIGS. 11 and 12, and has through-holes of different diameters. 41, 42, and 43 are formed by being sequentially shifted in the radial direction, and the axial lengths thereof are further changed so as to secure a larger flow velocity difference than in the case of the rectifying body 25.

Vii) Rectifier 27 shown in FIGS. 15 and 16
.. is applied, this rectifying body 27 is configured by bundling a plurality of pipes 44, 44, ... And is basically similar to the rectifying body 22 shown in FIG. 8. By making the length of the pipe 44 located at the loyalty of the bundle longer than other pipes, the flow resistance becomes smaller toward the outer periphery.

Viii) Others As a method of making the distribution resistance different in the radial direction, it is also possible to make the number of meshes of the net 46 different in the radial direction in the one shown in FIG.

Sixth Embodiment FIG. 20 shows an ultra-high pressure water nozzle 1 according to an embodiment of the invention described in claim 4 of the present application. The ultra-high pressure water nozzle 1 maintains the converging property of the jet J at a higher level by both the measures before the contraction and the measures after the injection. Specifically, the rectifiers 21 to 27 are arranged inside the ultrahigh pressure water flow path 3 to inject a jet J having a high focusing property by reducing the swirling velocity component of the ultrahigh pressure water or improving the flow velocity distribution. A space 31 is provided downstream of the orifice 5.
The reduced diameter portion 32 and the converging nozzle 33 are formed to prevent deterioration of the converging property due to diffusion of the jet flow J ejected from the orifice 5, so that the jet flow J can be a member to be cut while maintaining a high level of converging property. It is injected to improve the cutting performance.

Seventh Embodiment FIG. 21 shows an ultrahigh pressure water nozzle 1 according to an embodiment of the present invention as set forth in claim 5 of the present application. This ultra-high pressure water nozzle 1 is based on the same concept as that of the sixth embodiment, and has rectifiers 21 to 27 on the upstream side of the orifice 5 with respect to the abrasive grain mixing type ultra-high pressure water nozzle 1. The space portion 31, the reduced diameter portion 32, and the focusing nozzle 33 are formed on the downstream side, respectively, and the operation and effect thereof are substantially the same as those of the sixth embodiment.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of an ultrahigh pressure water jet nozzle according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of an ultrahigh pressure water jet nozzle according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of an ultrahigh pressure water jet nozzle according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a main part of an ultrahigh pressure water jet nozzle according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory view of cutting performance of the ultra-high pressure water jet nozzle shown in FIGS. 1 to 4.

FIG. 6 is a longitudinal sectional view of a main part of an ultra-high pressure water jet nozzle according to a fifth embodiment of the present invention.

7 is a perspective view showing a first structural example of the rectifying body of FIG.

8 is a perspective view showing a second structural example of the rectifying body in FIG.

9 is a perspective view showing a third structural example of the rectifying body in FIG.

10 is a perspective view showing a fourth structural example of the rectifying body of FIG.

11 is a side view showing a fifth structural example of the rectifying body of FIG.

12 is a view on arrow XII-XII in FIG.

13 is a side view showing a sixth structural example of the rectifying body of FIG.

FIG. 14 is a view on arrow XIV-XIV in FIG.

FIG. 15 is a side view showing a seventh structural example of the rectifying body of FIG.

16 is a view taken along the line XVI-XVI in FIG.

FIG. 17 is an explanatory diagram 15 of a flow state of ultra-high pressure water when the rectifying body shown in FIGS. 7 to 10 is applied.

FIG. 18 is an explanatory diagram 15 of a flow state of ultra-high pressure water when the rectifying body shown in FIGS. 11 to 16 is applied.

FIG. 19 is a comparative explanatory diagram of cutting performance with and without a rectifying body.

FIG. 20 is a longitudinal sectional view of an essential part of an ultrahigh pressure water jet nozzle according to a sixth embodiment of the present invention.

FIG. 21 is a longitudinal sectional view of an essential part of an ultrahigh pressure water jet nozzle according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 is an ultra high pressure water nozzle, 2 is a nozzle tube, 3 is an ultra high pressure water flow path, 4 is a clamp member, 5 is an orifice, 6 is an orifice holder, 11 is a mixing chamber, 12 is a mixing chamber forming member,
13 is an abrasive nozzle, 14 is an abrasive grain supply chamber, 21 to 2
7 is a rectifying body, 29 is a spacer, 31 is a space part, 32 is a diameter reducing part, 33 is a focusing nozzle, 40 to 43 are through holes, 44 is a pipe, 45 is a cylinder, and 46 is a net.

Claims (9)

[Claims] 1. An ultra-high pressure water flow path (3) into which ultra-high pressure water is introduced.
An orifice (5) having a through hole (5a) is provided at the tip of the ultra high pressure water flow path (3) of the nozzle tube (2) provided with the above, and the ultra high pressure water is passed through the orifice (5a) of the orifice (5). ) Is a super high-pressure water jet nozzle that is made to contract and jet at a predetermined volume that surrounds the jet stream (J) coaxially with the through hole (5a) on the downstream side of the orifice (5). Holding space (31)
And a reduced diameter portion (32) continuous with the downstream end of the space portion (31) and gradually reduced in diameter toward the downstream side, and the reduced diameter portion (32)
Nozzle extending continuously to the downstream end of the nozzle and having a diameter dimension set to 1.5 to 5 times that of the through hole (5a) of the orifice (5).
(33) An ultra high pressure water jet nozzle characterized by being provided. 2. An ultra high pressure water flow path (3) into which ultra high pressure water is introduced.
An orifice (5) having a through hole (5a) is provided at the tip of the ultra high pressure water flow path (3) of the nozzle tube (2) provided with the above, and an abrasive grain mixing chamber is provided on the downstream side of the orifice (5). (1
(1) is formed and the jet (J) jetted from the through hole (5a) of the orifice (5) is mixed with abrasive grains and jetted. ) And the mixing chamber (11) at an intermediate position coaxial with the through hole (5a) of the orifice (5) and having a predetermined volume surrounding the jet (J) (31), and the space (31). (3
1) a reduced diameter portion 32 which is continuous with the downstream end and gradually decreases in diameter toward the downstream side, and a diameter dimension of the orifice which extends continuously to the downstream end of the reduced diameter portion 32. 5) through hole
An ultra-high pressure water jet nozzle, comprising: a focusing nozzle (33) set to 1.5 to 5 times as large as (5a). 3. An ultra high pressure water flow path (3) into which ultra high pressure water is introduced.
An orifice (5) having a through hole (5a) is provided at the tip of the ultra high pressure water flow path (3) of the nozzle tube (2) provided with the above, and the ultra high pressure water is passed through the orifice (5a) of the orifice (5). ), The ultra high pressure water injection nozzle is adapted to inject water by constricting the flow in the ultra high pressure water flow path (3) located upstream of the orifice (5) from at least the orifice (5). An ultra-high pressure water injection nozzle, characterized in that rectifying bodies (21-27) having a predetermined flow resistance are provided at a distance equal to or larger than the inner diameter (D) of the ultra-high pressure water flow path (3). 4. An ultra high pressure water flow path (3) into which ultra high pressure water is introduced.
An orifice (5) having a through hole (5a) is provided at the tip of the ultra high pressure water flow path (3) of the nozzle tube (2) provided with the above, and the ultra high pressure water is passed through the orifice (5a) of the orifice (5). ), The ultra high pressure water injection nozzle is adapted to inject water by constricting the flow in the ultra high pressure water flow path (3) located upstream of the orifice (5) from at least the orifice (5). The rectifying bodies (21 to 27) having a predetermined flow resistance are provided at a distance equal to or larger than the inner diameter (D) of the ultra high pressure water flow path (3), while the through holes (downstream) of the orifice (5) are provided. 5a) coaxially with the jet (J) and having a predetermined volume surrounding the space (31)
And a reduced diameter portion (32) continuous with the downstream end of the space portion (31) and gradually reduced in diameter toward the downstream side, and the reduced diameter portion (32)
Nozzle extending continuously to the downstream end of the nozzle and having a diameter dimension set to 1.5 to 5 times that of the through hole (5a) of the orifice (5).
(33) An ultra high pressure water jet nozzle characterized by being provided. 5. An ultra high pressure water flow path (3) into which ultra high pressure water is introduced.
An orifice (5) having a through hole (5a) is provided at the tip of the ultra high pressure water flow path (3) of the nozzle tube (2) provided with the above, and an abrasive grain mixing chamber is provided on the downstream side of the orifice (5). (1
(1) is formed and the jet (J) jetted from the through hole (5a) of the orifice (5) is mixed with abrasive grains and jetted. ) In the ultra high pressure water flow path (3) located on the upstream side, a predetermined flow resistance is set at a distance from the orifice (5) at least by a dimension corresponding to the inner diameter (D) of the ultra high pressure water flow path (3). While the rectifying body (21-27) having the above is provided, the jet flow (J) is provided at the intermediate position between the orifice (5) and the mixing chamber (11) coaxially with the through hole (5a) of the orifice (5). And a space portion (31) having a predetermined volume and surrounding the space portion (3)
1) a reduced diameter portion 32 which is continuous with the downstream end and gradually decreases in diameter toward the downstream side, and a diameter dimension of the orifice which extends continuously to the downstream end of the reduced diameter portion 32. 5) through hole
An ultra-high pressure water jet nozzle, comprising: a focusing nozzle (33) set to 1.5 to 5 times as large as (5a). 6. The rectifying body (21, 25, 26) according to claim 3, 4 or 5, forming a plurality of through holes (40 to 43) penetrating in the axial direction of the ultra high pressure water flow path (3). An ultra-high pressure water injection nozzle, which is characterized in that it is composed of a block body. 7. The ultra-high pressure water according to claim 3, 4 or 5, wherein the rectifying body (22, 27) is formed by bundling a plurality of pipes (44, 44, ...). Injection nozzle. 8. The mesh according to claim 3, 4 or 5, wherein the rectifying body (23) crosses an internal passage of a tubular body (45) fitted in the ultra high pressure water flow passage (3). (46,4
6) An ultra-high pressure water jet nozzle characterized by being attached. 9. The flow resistance of the rectifying body (25 to 27) according to claim 3, 4, 5, 6, 7 or 8, wherein the radially outward portion of the ultra high pressure water flow passage (3) is inside. An ultra-high pressure water jet nozzle characterized in that it is set to be smaller than the sideward portion.