JP2539179Y2 - Injection liquid branch structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a branching structure of a jetting liquid in which a liquid flow in a main conduit is divided and introduced into a jetting nozzle. The present invention also relates to a structure in which the dispersion of the injected liquid is reduced, and the injection between the nozzles does not vary even when the liquid is branched into a large number of nozzles.

[0002]

2. Description of the Related Art A high-pressure liquid is ejected from a nozzle to form a high-speed liquid flow, and the liquid flow is used to clean and deburr mechanical parts, supply fuel and the like, clean electronic parts, and the like.
Various techniques for performing processing such as cutting and polishing have been put to practical use. For example, cutting the metal pipe by injecting cold water with increased pressure to hundreds kg / cm ² by dispersing the abrasive grains from the nozzle, also the jet of ultra-pure water heated to a surface of the semiconductor substrate to be rotated There is known a technology of washing by colliding particles. In many of these applications, apart from for sprinklers and other applications,
With respect to the liquid flow ejected from the nozzle, the flow velocity and density are maintained without spreading even after a long flight distance,
Further, it is desired that the vibration does not have a temporal vibration.

[0003] In applications where non-diffusibility and non-vibration are required for a liquid flow ejected from a nozzle, a plurality of nozzles are connected to a single main conduit, and a large number of branches are connected. May be performed. For example, when batch processing a wide flat surface, a surface with significant unevenness, and a cylindrical surface of the hole,
This is a case where a large number of samples are processed in parallel. At this time, uniformity of the liquid flow between the plurality of nozzles is also desired.

[0004]

When a large number of branch pipes are connected to a main conduit to branch a liquid flow, particularly when a branch pipe is set up at a right angle from the main conduit, no branch is performed. The non-diffusibility and non-vibration of the liquid flow jetted from the nozzles are greatly impaired compared with the case where the liquid is jetted directly from one nozzle, and the uniformity of the liquid flow between the nozzles is also improved. It is known that it deteriorates outside the range of practicality. In particular, in the branch pipe near the base of the main conduit, the non-diffusive property and non-vibration property of the injected liquid flow were significantly inferior to those in the branch pipe near the end of the main conduit.

On the other hand, in such a case, if the shapes of the main conduit and the branch pipe are hydrodynamically modified to some extent, the non-diffusive and non-vibrating properties of the injected liquid flow and the liquid flow between the nozzles can be improved. It is known that uniformity is significantly restored. For example, there is a method in which the base of the branch pipe is bent in an arc shape to branch obliquely from the main pipe in an advancing direction, the branch pipe is formed to be elongated, and the distance between the main pipe and the nozzle pipe is enlarged. Here, は suppresses streamline turbulence (generation of eddies) due to branching, and は recovers streamlines turbulent at branching (attenuates generated vortices) in the branch pipe.

That is, in the case where a number of branch pipes provided with nozzles are connected to one main conduit and the liquid flow branches at right angles to each other, a liquid flow traveling in the main conduit and a liquid flow traveling in the branch pipe are provided. , A strong vortex is generated near each branch point. The vortex flows into the nozzles one after another with the branched liquid flow, and the jet shape deteriorates, that is, the jetted liquid flow does not converge.
If it spreads shortly and a slightly longer flight distance is set, the lack of non-diffusibility makes it impossible to ensure the required liquid flow velocity and density. Near the inlet of the branch pipe on the side near the base of the main conduit, the flow velocity of the liquid flow traveling in the main conduit is larger than that on the side near the terminal, and the speed difference between the fluid flow and the liquid flow traveling in the branch pipe is also large. Because of the large size, it is considered that strong eddies are generated.

[0007] However, the above-mentioned invention of the hydrodynamically preferable shape and dimensions cannot completely solve the problem caused by the turbulence of streamlines (the generation of eddies) due to branching. ,
Even if the above measures were taken, the non-diffusive property and non-oscillating property of the liquid flow ejected from the nozzles and the uniformity of the liquid flow between the nozzles were achieved by directly jetting from one nozzle without branching. It is still inferior to the case.

[0008] In some cases, these measures are not desirable due to cost and space constraints. For example, a branch containing a bend means expensive piping material and difficult processing, and an elongated branch means an increase in the distance from the main conduit to the nozzle tip. At present, the size and number of workpieces to be stored in the apparatus are increasing, and even an automated mechanism for handling the workpiece is newly stored in the apparatus, while the size of the entire apparatus is It is necessary to maintain the status quo and further reduce it. In addition, it goes without saying that the equipment and operating costs are reduced. Under such circumstances, measures that can be adopted are limited, and the above-described expensive piping material, difficult processing, and an increase in the distance between the main conduit and the nozzle may not be acceptable.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the conventional method does not completely solve the problem caused by streamline turbulence (occurrence of eddy) due to branching. It is made in view of the fact that it is not practical from the viewpoint of non-diffusibility to the liquid flow ejected from the nozzle,
Non-vibration is ensured, and excellent uniformity of liquid flow between nozzles when a large number of nozzles are arranged.
It is an object of the present invention to provide a jet liquid branching structure that has a simpler structure, requires a shorter distance from a main conduit to a nozzle tip, has less spatial restrictions on piping, and has a smaller structure.

According to a first aspect of the present invention, there is provided a branch structure of an injection liquid in which a liquid flow in a main conduit is divided and introduced into an injection nozzle, and the downstream side of the plurality of openings is larger than the sum of the openings. A flow straightening pipe arranged in a pipe having a flow passage area is arranged between a main conduit and a nozzle.

[0011]

According to the first aspect of the present invention, the vortex is generated by the interaction between the liquid flowing in the main conduit and the liquid flowing in the branch pipe, and the vortex flows into the branch pipe. However, since the vortex is rapidly attenuated in the straightening tube, the effect of the vortex on the nozzle is reduced. That is, at multiple openings, large vortices are broken down and pass through the openings as multiple small vortices, and are discharged into a conduit having a flow area larger than the sum of the openings arranged downstream of the openings. Also, many small vortices are generated at the outlet of the opening. However, small vortices that are dispersed at high density in the cross-section of the pipeline and continuously occur in large numbers interfere with each other, rapidly attenuate, and disappear before progressing too far in the pipeline. Therefore, rectification is completed before reaching the nozzle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a branch structure of a jet liquid according to an embodiment. This is a branch structure employed in a device for cleaning and deburring the surface of a cast product by spraying high-pressure water from a nozzle, and has seven openings between the main conduit and the nozzle. A flow straightening tube is arranged.

In FIG. 1, the nozzle head H has eight stepped branch ports B each having a tapered screw formed on the outlet side.
They are arranged in parallel. A cylindrical flow straightening tube A is inserted into the branch opening B, and the flow straightening tube A is fixed in position from the outlet side into the branch opening B using a nozzle N having a tapered screw.
Inside the nozzle head H, there are formed main conduits M commonly connecting the branch ports B, and tapes formed at both ends of the main conduit M are formed.
A blind plug E is attached to the screw part. The main conduit M is connected to a water pipe D, one of which is connected to a high-pressure pump (not shown). The rectifier tube A has a center and six openings a1 radially from the center, that is, a total of seven openings a1, and a rectification part a2 having a larger cross-sectional area than the total of the openings a1 is formed downstream of the openings a1. ing. The diameter of the nozzle N is 0.1 to
0.8 mm.

In the branch structure of the jet liquid formed in this way, the nozzle head H is fed through the water guide pipe D at 100 to 3000 kg / cm ² , mainly at 500 to 2500 kg / c.
room temperature was mixed with rust increases the pressure to the m ² (0 to 50
Is supplied at a flow rate of 0.4 to 20 l / min, the water flow traveling in the main conduit M and the branching port B near each branch point are conventionally supplied. The direction of the flowing water changes rapidly and eddies occur. Here, since each branch gradually reduces the flow rate of the water flow in the main conduit M toward the blind plug E, a stronger vortex is generated at a branch point close to the water pipe D.

On the other hand, a strong vortex flows into the branch opening B, but the vortex is disassembled by the seven openings a1 and
While traveling through 1, the phases are shifted from each other, and are discharged to the rectification unit a2 as a large number of small eddies. In addition, many small eddies are newly generated on the exit side of the opening a1. A large number of these small vortices distributed at high density and continuously supplied in the cross-sectional area of the rectification unit a2
As they progress, they interfere with each other and cancel each other out, and rapidly decay. This rate of attenuation is much higher than in the case of the conventional mechanism in which a strong vortex travels toward the nozzle.

Thus, it is possible to supply water to the nozzles stably in a wide range of flow rates and flow velocities, and to maintain a constant flow rate and density of the water flow without diffusion even after a long flight distance. Jet water with little variation in the water content is obtained. This significantly increases the cleaning effect and cleaning reliability. Further, the distance between the main conduit M and the nozzle N can be further reduced.

The pressure loss of the straightening pipe AN of this embodiment is 0.2 kg / c.
In m ² approximately, because compared to the discharge pressure of the nozzle is less than 0.2%, almost no adverse effects (lowering of flow rate) due to piezoelectric loss.

FIG. 2 is a side view of the straightening tube structure. Here, together with the flow straightening tube structure (a) in the embodiment of FIG.
(b), (c) Two other examples are shown.

In FIG. 2A, as described above, the rectifier tube A has a center and six openings a1 radially from the center, that is, a total of seven openings a1. Opening a1
The rectifying portion a2 having a cross-sectional area larger than the sum of

In FIG. 2 (b), the flow straightening tube A2 has a porous and soft sponge a3 fixed on the upstream side of the pipe a4. Here, the pressure loss of the flow straightening tube A2 is slightly increased as compared with the embodiment of FIG. 1, but the vortex is further subdivided, so that the vortex attenuation effect is large. In addition, an effect of damping pressure vibration by a soft material is expected.

In FIG. 2 (c), the flow straightening tube A3 has two layers of wire mesh having different opening densities fixed on the upstream side of the pipe a4. Here, the vortex is subdivided into two stages.

FIG. 3 is a front view of the flow straightening tube structure. Here, together with the flow straightening tube structure (a) in the embodiment of FIG.
(b), (c) Two other examples are shown.

In FIG. 3A, as described above, the flow straightening tube A has a center and six openings a1 radially from the center, that is, a total of seven openings a1.

In FIG. 3B, the flow straightening tube A5 is shown in FIG.
A member a9 in which a number of short small-diameter pipes are bundled is fixed on the upstream side of a pipe a4 similar to (b) and (c). The downstream side of the member a9 is arranged in a similar pipeline to that shown in FIGS. 2 (b) and 2 (c).

In FIG. 3C, the flow straightening tube A6 is shown in FIG.
A member a10 having a honeycomb structure is fixed on the upstream side of a pipe a4 similar to (b) and (c). The downstream side of the member a9 is arranged in a similar pipeline to that shown in FIGS. 2 (b) and 2 (c).

As described above, the shapes and materials of the many openings of the flow straightening tube are not limited to the embodiment shown in FIG. 1. In short, the shapes and materials having a large number of uniform small eddies and a small pressure loss are used. It just needs to be selected. Therefore, an appropriate material can be selected from various materials (porous material, wire mesh, honeycomb material, bundled thin tubes, and the like) in consideration of conditions such as the flow velocity (pressure loss), the flow rate, and the type of the jet liquid. These may be provided in a plurality of stages.

Further, the diameter and the axial cross-sectional shape of the conduit following the many openings of the straightening tube are not limited to the straight tube of the embodiment of FIG. 1 and do not generate vortices and adversely affect the nozzle operation. You can choose freely within the range not given.

Further, in the embodiments of FIGS. 1, 2 and 3,
Although the flow straightening pipes are inserted into the nozzle head H, the flow straightening pipes may be welded between the main conduit and the nozzles to respectively form branch pipes.

[0030]

According to the first aspect of the present invention, the vortex flowing into the branch pipe is subdivided, rapidly attenuated, and does not reach the nozzle. Therefore, the problem caused by the turbulence of the streamline due to branching (the generation of eddies) is more effectively solved than the conventional method, and the non-diffusibility and non-vibration of the liquid flow ejected from each nozzle are secured. The uniformity of liquid flow between nozzles is also excellent.

Further, from the viewpoint of the spatial restriction of the piping structure and the cost reduction, the degree of freedom in design is high, such as the simpler structure and the shorter distance from the main conduit to the tip of the nozzle. Excellent.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a branch structure of a jet liquid according to an embodiment.

FIG. 2 is a cross-sectional view showing another example of a flow straightening tube in the embodiment of FIG.

FIG. 3 is a front view showing another example of the structure of the flow straightening tube.

[Explanation of symbols]

 A Rectifier tube B Branch port D Water pipe E Screw H Nozzle head M Main conduit N Nozzle a1 Opening a2 Rectifier

Claims (1)

(57) [Scope of request for utility model registration] 1. A branch structure for a jet liquid in which a liquid flow in a main conduit is diverted and introduced into an injection nozzle, the downstream sides of a number of openings are combined into a pipe having a flow area larger than the sum of the openings. A diverging structure for jetting liquid, wherein a straightening pipe is arranged between a main conduit and a nozzle.