JP2003144882A - Submersible jet nozzle and water current generating apparatus having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle put into the water for jetting pressurized water while increasing the amount of the surrounding water to be sucked from the sucking holes arranged on the nozzle to the inside of the nozzle. SOLUTION: The nozzle is constituted so that a spouting flow passage 14 is communicated with an inflow passage 12 to be connected to a pressurized water supplying pipe while an orifice 13 is interposed between them, a pair of sucking holes 18A, 18B each having a round shape in the cross section are arranged oppositely to each other on the peripheral wall of the passage 14 at the positions proximate to the orifice 13. Jetting water of the volume increased by involving the surrounding water in the passage 14 from the holes 18A, 18B by the negative pressure generated by the jetting water current passing through the passage 14 is jetted underwater from a jetting hole arranged at the tip of the passage 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater injection nozzle and a water flow generator equipped with the nozzle, and more specifically, to inject a liquid in water to generate a water flow and generate agitation. Cleaning in water, etc.
It is used for underwater etching, for moving the liquid in the plating liquid layer to make the concentration uniform, and for agitating in the circulating water tank or drainage tie.

[0002]

2. Description of the Related Art Conventionally, in an underwater injection nozzle which is placed in water and used for the above-mentioned purpose, a nozzle 1 is placed in a water tank 2 as shown in FIG. In addition to supplying the pressurized water as described above, the flow of the supplied pressurized water in the nozzle 1 is used to suck the surrounding water into the inside of the nozzle through the suction hole 4 opening in the peripheral wall of the nozzle to increase the amount of jetted water. I am letting you. In this way, by increasing the injection amount rather than the supply amount to the nozzle, the water flow generated by the injection water is increased, the stirring power is increased, or the water flow is made to collide with the object with a large force, and underwater cleaning is performed. And so on.

In the nozzle 1, as shown in FIG. 14, the tip of a small-diameter inflow pipe 5 is projected into the large-diameter injection pipe 6, and a peripheral wall of the injection pipe 6 behind the discharge port 5a of the inflow pipe 5 is formed. A pair of suction holes 4 is provided in the rear side, negative pressure is generated on the rear side by the flow velocity of the jet water discharged from the discharge port 5a into the injection pipe 6, and the surrounding water is generated from the suction hole 4 into the injection pipe 6. Is sucked in to increase the amount of water jet.

A nozzle having a structure shown in FIG. 15 is also used as the underwater injection nozzle. The nozzle has a shape in which a pair of large horizontally long square holes 8 are provided so as to face the outer peripheral surface of the injection pipe 7 having a large diameter and the same cross-sectional area, and a thin partition wall 9 remains between the square holes 8. It is said that. In the nozzle, the surrounding water is made to flow into the nozzle from the large square holes 8A and 8B and is sprayed from the spray hole 7a at the tip of the spray pipe 7.

[0005]

In the nozzle shown in FIG. 14, since the suction hole 4 is arranged rearward of the discharge port of the inflow pipe 5, the total length of the nozzle becomes long and the injection pipe 6 is provided.
The outer diameter of will also increase. Further, in order to increase the amount of suction from the surroundings, it is necessary to make the suction hole 4 large, but in that case, the threaded portion of the inflow pipe 5 protruding from the rear portion of the injection pipe in order to be screwed to the supply pipe. 5b gets in the way. Therefore, it is necessary to position the screwed portion 5b rearward, and for this reason also the nozzle becomes long. If the nozzle becomes long and large, the arrangement space will be taken up, and there is a problem that the nozzle becomes an obstacle and it is necessary to enlarge the water tank 1 itself.

In the nozzle shown in FIG. 15 described later, the injection pipe 7
Since the suction hole provided in the peripheral wall of the is the square hole 8, the edge 8a
However, there is a problem that turbulent flow occurs in the water trying to flow into the nozzle at the edge 8a, which hinders the suction and the suction amount does not increase. Moreover, since the square hole 8 is very large, the negative pressure generated by the flow of the jet water is small, and the negative pressure becomes closer to the inflow rather than the suction, and there is a problem that the pressure of the jet water jetted from the jet hole 7a decreases. Further, instead of sucking the surrounding water from the square hole 8 into the nozzle, the sprayed water is easily jetted into the water from the square hole 8, and in this case, the suction of water is eliminated.

The present invention is intended to solve the above-mentioned problems of the conventional underwater injection nozzle, and aims to reduce the size of the nozzle and increase the amount of suction of surrounding water so that the amount of injection is smaller than the amount of supply. An object is to provide an underwater injection nozzle that can significantly increase the amount.

[0008]

In order to solve the above-mentioned problems, the present invention is an underwater injection nozzle which is placed in water and injects the supplied pressurized water into the water to generate a water flow. A jet flow passage is provided in communication with an inflow passage connected to the nozzle via an orifice, and a pair of suction holes having a circular cross section are provided facing each other on the peripheral wall of the jet flow passage at a position close to the orifice. The surrounding water is drawn into the jet passage from the suction hole by the negative pressure generated by the jet flow of the water, and the increased jet water is jetted into the water from the jet hole at the tip of the jet passage. We provide a characteristic underwater injection nozzle.

According to the above construction, since the orifice is provided between the inflow passage and the ejection passage, and the suction hole is provided in the peripheral wall of the ejection passage near the orifice, the flow velocity after flowing through the portion of the suction hole. The amount of water sucked from the suction hole can be increased by generating a large negative pressure accordingly. Moreover, since the suction hole has a circular cross section and a shape without an edge, turbulent flow is not generated at the peripheral edge of the suction hole, and the suction amount can be increased also from this point. In this way, by increasing the injection amount, the water flow generated in water can be made strong and large, and the stirring efficiency of water can be increased. Moreover, since the suction amount increases, efficient injection is performed even if the supply amount is reduced, and thus the running cost can be reduced.

Further, an inclined surface having a diameter reduced toward the orifice is provided on the inner peripheral surfaces of the inflow passage and the ejection flow passage, and
The jet flow passage is a hollow portion of a cylindrical pipe, and the cross-sectional area of the jet flow passage is larger than the cross-sectional area of the inflow passage, and the suction hole is provided at the end position of the inclined surface continuous with the orifice. There is.

As described above, the cross-sectional area of the inflow passage is made smaller than the cross-sectional area of the ejection flow passage, and the inclination angle on the inflow passage side is set to be more acute than the inclination angle on the ejection flow passage side. The flow velocity of the injection liquid can be increased. As a result, the negative pressure generated inside the suction hole can be increased to further increase the suction amount. Further, it is preferable that the inclined surface on the inflow path side is inclined in two steps so that the inclination angle at the tip becomes more acute. Further, when the suction hole on the ejection flow path side is provided at the end position of the inclined surface continuous with the orifice, the negative pressure can be increased, and the suction amount can be increased also from this point.

The pair of suction holes have a large perfect circle shape,
The diameter of the suction hole is substantially the same as the diameter of the injection hole. The reason why the number of suction holes is two is that the total cross-sectional area of the suction holes can be made larger and the amount of suction of the surrounding water can be increased by providing two holes in opposite positions to a large hole rather than providing a plurality of small holes. It depends on what you can do. Further, each suction hole has a circular shape in which a turbulent flow is generated by the edge when the suction hole is a square hole as in the conventional example, and therefore the suction hole is circular. The circle may be an elliptical shape, but if it is a perfect circle, the surrounding water can be smoothly sucked in with the least resistance.

The total sectional area of the suction holes is set to 12 to 28 times the orifice sectional area, the injection hole sectional area is set to the orifice sectional area 13 to 25 times, and the ejection passage length is set to 2 to 3 times the injection hole diameter. Then, it is preferable that the amount of injection is 2 to 4 times the amount of pressurized water supplied by being rolled in through the suction hole.

As described above, by setting the cross-sectional area of the suction hole, the cross-sectional area of the injection hole, the cross-sectional area of the orifice, and the length of the injection pipe, the injection is performed with respect to the supply water amount (discharge amount from the supply pipe). The amount can be 2 to 4 times, preferably 3 to 4 times. In the conventional nozzle shown in FIGS. 14 and 15, the injection amount is only about 1.5 times the amount of the supplied water, and the injection amount can be increased to more than twice that of the conventional product.

The submerged injection nozzle may have one inflow passage communicating with one ejection passage to form a straight line on the outer shape. However, if it is necessary to inject at a wide angle, a plurality of ejection nozzles may be used. The flow path is branched from the inflow path at a required angular interval to be continuous, and the orifices are provided at the branching positions of the respective ejection flow paths. For example, it is advisable to provide the two ejection passages at intervals of 60 degrees.

As an application of the above-mentioned branched nozzle,
An underwater injection nozzle that is placed in water and injects the supplied pressurized water into the water to generate a water flow, in which an inflow passage connected to the supply pipe of the pressurized water has a chamber extending in the width direction orthogonal to the flow axis direction. Communicates with the orifices of the ejection passages that are arranged side by side in the width direction on the front end face of the chamber and communicates with each ejection passage, and sucks ambient water into the peripheral wall at the downstream position close to the orifices. Provided is an underwater injection nozzle characterized in that a hole is provided, and surrounding water is sucked through the suction hole to increase the injection amount from the injection hole at the tip of each ejection passage to inject into the water. There is.

According to the above construction, since the orifices are provided between the chamber and the ejection passages and the suction holes are provided in the peripheral wall of the ejection passages in the vicinity of the orifices, the flow velocity passing through each orifice is high. Water flows through each suction hole to generate a large negative pressure, and the water around the nozzle is sucked into each jet passage from each suction hole. Therefore, it is possible to improve the injection efficiency by amplifying the total injection amount injected from each of the injection flow paths above the supply amount to the inflow path, and since a plurality of injection flow paths are provided in parallel, the width It is possible to inject in a wide range in any direction.

According to the present invention, one or a plurality of the submerged jet nozzles are arranged in a liquid tank, and convection is generated in the jet direction from the submerged jet nozzles to stir the liquid and at the rear of the submerged jet nozzle. There is provided a water flow generation device including an underwater injection nozzle configured to move the liquid on the side toward the front in the injection direction.

When convection is to be generated over the entire liquid tank, the submerged injection nozzle is horizontally arranged at one end-side corner of the liquid tank on the bottom wall side, and the flow is made along the bottom wall. It is generated and this water flow collides with the other end side and rises,
By conversing around the water surface and flowing, convection can be generated in the entire liquid tank. Further, by arranging the nozzles in the respective corners of the liquid tank so as to face the directions in which water flows are generated, respectively, it is possible to more reliably generate convection in the entire liquid tank. In this way, by generating convection in the entire liquid tank and stirring the liquid, it is possible to make the concentration of the plating liquid uniform in the plating liquid layer, and by stirring the liquid in the circulation tank and drainage tank. It is possible to prevent sedimentation on the bottom surface.

When parts are suspended in a liquid tank for cleaning in water or underwater etching, submersible injection nozzles are arranged on both sides or one side of the parts to inject liquid toward the parts. It is configured. When performing the above-mentioned underwater cleaning or the like, a large amount of water is jetted from the underwater jet nozzle, so that a large amount of water can be made to collide with the parts, so that the washing effect and the like can be improved.

Further, when it is necessary to generate bubbling in water, the tip of the tube is fitted into the suction hole of the underwater injection nozzle arranged in the liquid tank, and the air is naturally sucked by negative pressure by the tube. Then, air is ejected into the water as bubbles together with the jetted water, and bubbling is performed at the same time when the water flow is generated.

[0022]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of an underwater injection nozzle of the present invention.

The underwater injection nozzle (hereinafter, abbreviated as "nozzle") 10 of the first embodiment is an integrally molded product, and an inflow passage 12, an orifice 13 and an ejection passage are provided on the same axis in a substantially cylindrical body 11. 14 are communicated with each other.
One side portion of the body 11 on which the inflow passage 12 is provided is a small diameter portion 1
As 1a, a threaded portion 11b screwed to the supply pipe 20 (shown in FIG. 3) is provided on the outer peripheral surface thereof. The diameter of the small diameter portion 11a is increased stepwise to form a large diameter portion 11c which is a straight pipe up to the tip of the injection hole 15.

Inside the small diameter portion 11a of the body 11,
An inflow path 12 and an orifice 13 are provided, and an inclined surface 16 is provided between the inflow path 12 and the orifice 13. Assuming that the cross-sectional area of the inflow passage 12 is S1 and the cross-sectional area of the orifice 13 is S2, the ratio of these two values is 6 ≦ in this embodiment.
The range is S1 / S2 ≦ 10. Further, the length L1 of the orifice 13 and the diameter D1 of the orifice are L1
/D1=1.5 to 2.5 is set.

The slope 16 between the flow path 12 and the orifice 13 has a shape in which the slope angle is reduced in two steps from the slope 16a to the slope 16b, as shown enlarged in FIG.

The front end of the orifice 13 is located on the same line as the stepped portion 11d of the body 11, and is connected to the ejection passage 14 through an inclined surface 17 whose diameter increases from the front end. The angle of the inclined surface 17 is 110 ° or more in this embodiment.
The angle is set to 0 ° or less, and is wider than the inclined surface 16 on the inflow path 12 side. The cross-sectional area of the ejection passage 14 from the end of the inclined surface 17 to the tip ejection hole 15 is constant S3. The cross-sectional area S3 of the ejection passage 14 (injection hole 15) and the orifice 1
The cross-sectional area S2 of 3 is set to S3 / S2 = 13 to 25. Further, the length L2 of the ejection passage 14 and the diameter D2 of the ejection passage are set to L2 / D2 = 2 to 3.

A pair of suction holes 18A and 18B having the same shape are provided at the end position of the inclined surface 17 on the peripheral wall of the injection passage 14 at the opposite positions. As shown in FIG. 1B, these suction holes 18A and 18B have a perfect circular cross section. The diameter D3 of the suction holes 18A and 18B is about the same as the diameter of the injection hole 15. Also, the suction holes 18A and 18
The sectional area S4 including B is the sectional area S2 of the orifice 13.
It is set to 12 to 28 times.

As shown in FIG. 3, the nozzle 10 is arranged horizontally in a corner near the bottom wall inside the water tank 2, and the tip of the supply pipe 20 is screwed into the threaded portion 11b of the body 11. It is attached and connected, and the supply pipe 20 is connected to the discharge port of the pump 3. The suction port of the pump 3 has a suction pipe 21.
, The other end of the suction pipe 21 is hung in the water tank 2, and the water 30 in the water tank 2 is sucked up by the pump 3 and discharged to the nozzle 10 via the supply pipe 20 as a required pressure for circulation. I am letting you.

In the water flow generator having the nozzle 10 shown in FIG. 3, when the pressurized water supplied from the pump 3 to the nozzle 10 is supplied to the inflow passage 12, the pressurized water passes through the orifos 13 and is further pressurized. After that, it flows into the ejection passage 14.

As shown in FIG. 4, the jet water that has passed through the orifice 13 and flown into the jet passage 14 is vigorously injected.
5, and a large negative pressure is generated in the suction holes 18A and 18B provided in the peripheral wall of the injection flow passage 14. Due to this negative pressure, the water around the nozzle 10 is sucked into the jet flow path 14, and the jetted water increased by the sucked water is jetted into the water 30 in the water tank 2.

Since the suction holes 18A and 18B have a perfect circular shape and are not provided with an edge against which the water flow hits, the surrounding water is sucked into the jet flow passage 14 without generating a turbulent flow. Moreover, the cross-sectional area S4 of the suction holes 18A and 18B, the cross-sectional area S2 of the orifos 13, the cross-sectional area S3 of the injection hole 15, and the length of the ejection passage 14 are set to the above-described dimension settings. 2 injection amount for supply amount
It can be up to 4 times.

According to the experimental results of the applicant, the relationship between the supply amount (discharge amount from the pump) and the injection amount in the nozzle 10 having the following size settings is as shown in the table of FIG. Orifice diameter: φ3, orifice length 4.5m
m, injection hole diameter: φ13, ejection passage length: 32.5 m
m, suction hole diameter: φ11

As described above, since the injection quantity from the nozzle 10 is large, a large water flow can be generated in the water tank 2. As shown in FIG. 3, this water flow flows to the other side along the bottom wall of the water tank 2, flows upward when it hits the side wall on the other side, and further flows near the water surface as indicated by the arrow, By generating convection over the entire tank 2, the water 30 in the water tank 2 can be stirred. As shown in FIG. 6, by arranging the nozzles 10 at the four corners of the bottom wall and the upper portions of the side walls, the convection indicated by the arrow in the figure can be generated more reliably inside the water tank 2.

The nozzle 10 has suction holes 18A, 1
8B is provided at a position close to the orifos 13 and the above-mentioned FIG.
Unlike the conventional nozzle of No. 3, the suction hole is not provided at a position rearward of the inflow path, so that the overall length and outer diameter can be made smaller than that of the conventional nozzle, and the size can be reduced. Therefore, it does not become an obstacle in the water tank 2, and it is not necessary to enlarge the water tank even if a plurality of water tanks are arranged as shown in FIG.

7A and 7B show a modification of the first embodiment. The nozzle 10 ′ of FIG.
The continuous surface 17 ′ from the 3 ′ to the large diameter portion 11c is a vertical surface without inclination, and the nozzle 10 ″ of FIG. 7 (B) has an inner peripheral surface 16 ″ of the inflow passage 12 ″ of the small diameter portion 11a ″. Is a curved surface that smoothly reduces in diameter toward the orifice 13 ″. Further, the nozzle may have a tapered shape in which the inner diameter of the ejection passage is enlarged toward the injection hole. Other configurations are the same as in the first embodiment described above. The description is omitted because it is similar to.

FIGS. 8 and 9 show a water jet nozzle 100 for wide angle jet in two directions according to the second embodiment. The nozzle 10
0 is provided by branching the two ejection passages 14A and 14B with respect to the axis X from the front end of the inflow passage 12.

Between the inflow passage 12 and the ejection passages 14A, 14B is provided a partition wall 11e that is gently inclined in a V shape, and the partition wall 11e is provided with orifices 13A, 13B to provide the ejection passages 14A, 14B, respectively. Is in communication with. The angle between the axes of the jet passages 14A and 14B is set to about 45 degrees, and jetting is performed in two directions from the jet holes 15A and 15B at the tip of each jet passage. An inclined surface 17A continuing from the orifices 13A and 13B on the root side of each of the ejection passages 14A and 14B,
A pair of suction holes 18A-1 and 18B-1, 18A-2 and 18B-2 having a perfect circular cross section similar to those of the first embodiment are provided at the end position of 17B. Other configurations and dimensional relationships are the same as those in the first embodiment, and thus the description thereof will be omitted.

With the nozzle 100, the jet water increased in two directions can be jetted, so that convection can be generated in the water in the water tank and the stirring effect can be enhanced. It should be noted that the ejection passage is not limited to two, and may be branched into three to four or the like to widen the ejection range.

FIG. 10 shows a third embodiment. The nozzle 200 of the third embodiment is integrally molded, and has a small diameter portion 11 having a screw portion on the outer surface from one side portion of the substantially rectangular parallelepiped body 11.
a is projected. Inside the body 11, an inflow passage 12 inside the small-diameter portion 11a is provided in a region corresponding to the front half in the longitudinal direction.
To form a chamber 19 extending in the width direction, and five small-diameter cylindrical orifices 13 are bored at equal intervals on the tip end surface of the chamber 19 and communicated with each orifice 13 in a region corresponding to the rear half of the inside of the body 11. The cylindrical ejection passage 14 is formed coaxially. The length L of the orifice 13
2 and the diameter D2 of the second orifice are L2 / D2 = 1.
It is set to 5 to 2.5.

An inclined surface 16 having an enlarged diameter is provided between the inflow passage 12 and the chamber 19, and the orifice 13 and the ejection passage 14 are provided.
An inclined surface 17 that expands in diameter is provided between and. Slope 17
Is 110 ° or more and 140 ° or less, and the cross-sectional area of the ejection passage 14 from the end of the inclined surface 17 to the injection hole 15 is constant S3. Cross-sectional area S of the jet passage 14
3 and the cross-sectional area S2 of the orifice 13 are S3 / S2 = 1
It is set to 3 to 25. In addition, the length L of the jet passage 14
2 and the diameter D2 are set to L2 / D2 = 2 to 3.

A pair of perfect circular suction holes 18A and 18B are formed in the peripheral wall of the jet passage 14 at the end position of the inclined surface 17 at the opposite positions. Diameter D3 of suction holes 18A, 18B
Is approximately the same as the diameter of the ejection passage 14, and the cross-sectional area S4 of the suction holes 18A and 18B is set to 12 to 28 times the cross-sectional area S2 of the orifice 14.

In the nozzle 200, the tip of a liquid supply pipe (not shown) is attached to the screw portion on the outer surface of the small diameter portion 11a to supply water of a required pressure to the inflow passage 12. When the pressurized water is supplied to the inflow path 12, the water flows into the chamber 19 and diffuses in the width direction, and the water is provided on the tip surface.
After passing through the three orifices 13 and being pressurized, it flows into the ejection passage 14. The water that has passed through the orifices 13 and flowed into the ejection passages 14 flows vigorously, and the ejection passages 14
A large negative pressure is generated at the portions of the suction holes 18A and 18B provided on the peripheral wall of the. By this negative pressure, the water around the nozzle 10 is sucked into the inside of the jet flow path 14 through the suction holes 18A and 18B, and the amount of the suctioned water is jetted outside from the jet holes 15 on the tip surface of the body 11. To be done.

FIG. 11 shows a modified example of the water flow generator in the water tank using the underwater injection nozzles of the above-described first to third embodiments, in which the nozzle causes bubbling together with the water flow in the water tank 2. .

To explain the nozzle 10 of the first embodiment as a representative, the air supply tube 32 is connected to one suction hole 18A of the nozzle 10 and air is naturally introduced into the nozzle 10 through the tube 32 by negative pressure. I am inhaling. The air supplied to the inside of the nozzle collides and mixes with the jet water and is jetted as bubbles into the water to cause bubbling in the water tank. The other suction hole 18B is an opening to suck water into the inside of the nozzle as in the case of the above embodiment.

FIGS. 12A to 12C show a modified example of the water flow generator in which the nozzle 10 is arranged in the water tank 2. Figure 1
2 (A) is a water supply pipe 2 in the water tank 2 with a vertical direction on one side.
No. 0 is arranged, the nozzles 10 are connected to the supply pipe 20 at intervals in the vertical direction, and the nozzles 10 inject toward the center of the water tank 2. With the above configuration,
By the negative pressure of the jet flow jetted from each nozzle, the water in the water tank behind the nozzle can be moved toward the center,
The concentration of water in the water tank can be made uniform.
In FIG. 12B, a processing component 50 such as a printed circuit board is suspended in the central portion of the water tank 2, the nozzles 10 on both the left and right sides thereof are arranged, and the processing component 50 is jetted toward both sides.
This structure is suitable for cleaning the processing member 50 in water or etching it in water. In FIG. 12 (C), the supply pipe 20 is vertically arranged in the center of the water tank 2, and the nozzles 10 are arranged on both sides of the supply pipe 20 with a vertical interval therebetween, while the printed circuit boards and the like are arranged on both sides of the water tank 2. Processing part 50
A and 50B are suspended.

The filling material in the water tank 2 is not limited to water and may be any liquid, and in the case of a plating bath, it is a plating liquid. Also, it may be a liquid in which the precipitate is mixed,
In this case, the precipitate can be stirred.

[0047]

As is apparent from the above description, according to the underwater injection nozzle of the present invention, in the ejection passage communicating with the inflow passage through the orifice, the suction hole is provided in the rear portion close to the orifice. Therefore, the total length and outer diameter of the nozzle can be reduced, and the nozzle can be made compact. Moreover, since the suction hole provided in the nozzle has two large circular cross sections, turbulent flow can be generated better than in the case of using a square hole, and surrounding water can be smoothly sucked into the nozzle. In addition, place the suction hole at the opposite position.
Since individual pieces are provided, the total area of these suction holes can be increased. As a result, the amount of water sucked into the nozzle from the surroundings can be increased, and the injection amount is 3 to 5 times as much as the supply amount (pump discharge amount) of the pressurized water to be supplied to the nozzle, which is a leap compared to the conventional nozzle. Can be increased to In this way, by increasing the injection amount into water, the water flow generated can be increased and the stirring effect can be enhanced.

[Brief description of drawings]

FIG. 1 shows an underwater injection nozzle according to a first embodiment of the present invention, (A) is a sectional view, (B) is a plan view, (C) is a left side view, and (D) is a right side view.

FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is a schematic view of a water tank in which an underwater injection nozzle is arranged.

FIG. 4 is a view showing an operation of the underwater injection nozzle.

FIG. 5 is a diagram showing a relationship between an injection amount and a supply amount (discharge amount).

FIG. 6 is a view showing the action of a water flow from an underwater injection nozzle.

7A and 7B are cross-sectional views showing a modified example of the nozzle.

FIG. 8 shows an underwater injection nozzle according to a second embodiment,
(A) is a sectional view, (B) is a sectional view taken along line BB of (A),
(C) is a right side view and (D) is a left side view.

FIG. 9 is a view showing the operation of the underwater injection nozzle according to the second embodiment.

FIG. 10A is a perspective view of an underwater injection nozzle according to a third embodiment, and FIG. 10B is a sectional view.

FIG. 11 is a schematic view showing another embodiment of a water flow generation device including an underwater injection nozzle.

12 (A), (B) and (C) are schematic views of another water flow generator.

FIG. 13 is a view showing an example of use of the underwater injection device.

FIG. 14 shows a conventionally used underwater injection nozzle, in which (A) is a front view, (B) is a sectional view, and (C) is a right side view.

FIG. 15 shows another conventionally used underwater injection nozzle, in which (A) is a perspective view, (B) is a front view, and (C) is a side view.

[Explanation of symbols]

2 water tank 3 pumps 10 Underwater injection nozzle 11 body 12 Inflow path 13 Orifice 14 Jet flow path 15 injection holes 18A, 18B Suction hole 20 supply pipe

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B201 AA01 BB02 BB22 BB32 BB87                       BB92                 4F033 QA09 QB03X QB03Y QB12X                       QB12Y QC07 QD04 QD14                       QE05 QE09 QF08Y                 4G035 AB37 AC24 AC29 AE13

Claims (7)

[Claims] 1. An underwater injection nozzle, which is disposed in water and injects the supplied pressurized water into the water to generate a water flow, wherein an ejection passage is connected to an inflow passage connected to a pressurized water supply pipe through an orifice. A pair of suction holes having a circular cross section are provided to face the peripheral wall of the jet flow passage in the vicinity of the orifice, and the negative pressure generated by the jet water flowing through the jet flow passage causes An underwater injection nozzle, characterized in that surrounding water is caught in an ejection flow path, and the increased amount of injection water is injected into water through an injection hole at the tip of the ejection flow path. 2. An inner peripheral surface of the inflow path and the ejection flow path is provided with an inclined surface whose diameter decreases toward an orifice, and the ejection flow path is a hollow portion of a cylindrical pipe, and The underwater injection nozzle according to claim 1, wherein the cross-sectional area is larger than the cross-sectional area of the inflow path, and the suction hole is provided at the end position of the inclined surface continuous with the orifice. 3. The pair of suction holes have a large circular shape, the diameter of the suction hole is substantially the same as the diameter of the injection hole, and the total cross-sectional area of the suction holes is 12 orifices. ˜28 times, the injection hole cross-sectional area is set to 13 to 25 times the orifice cross-sectional area, and the ejection flow path length is set to 2 to 3 times the injection hole diameter. Is 2 to 4 times the submerged injection nozzle according to claim 1 or 2. 4. The method according to claim 1, wherein a plurality of the ejection passages are branched into one inflow passage so as to be continuous with each other, and the orifices are provided at respective branching positions of the ejection passages. The underwater injection nozzle according to item 1. 5. An underwater injection nozzle, which is arranged in water and injects the supplied pressurized water into the water to generate a water flow, wherein an inflow path connected to the pressurized water supply pipe has a width orthogonal to the flow axis direction. The chambers that spread in the same direction, communicate with the orifices of the ejection channels that are arranged side by side in the width direction on the tip surface of the chamber, and surround the peripheral wall at the downstream position close to the orifices in each ejection channel. The underwater jetting is characterized in that a suction hole for sucking water is provided, and surrounding water is sucked through the suction hole to increase the jetting amount from the jetting hole at the tip of each jetting passage to jet into water. nozzle. 6. One or more underwater injection nozzles according to claim 1 are arranged in a liquid tank, and convection is generated in the injection direction from the underwater injection nozzles. A water flow generating device equipped with an underwater injection nozzle configured to move the liquid behind the underwater injection nozzle forward in the injection direction while stirring the liquid. 7. A structure in which a part is suspended in the liquid tank, and the underwater injection nozzles are arranged on both sides or one side of the part to inject a liquid toward the part. A water flow generator equipped with the underwater injection nozzle described.