JP2003159550A - Two-fluid nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-fluid nozzle capable of miniaturizing droplets with a small-quantity of low-pressure driving gas and equalizing spraying. <P>SOLUTION: A clearance (20) around the almost entire periphery of a spray port (11) through which a fluid can pass is disposed in the spray port (11), and a baffle (12) is provided. In addition, the clearance section (20) around the almost entire periphery through which the fluid can pass is disposed in the inside including a direct upper stream portion of the spray port (11) having the predetermined length of a channel to accommodate the baffle (12). Further, the baffle (12) is positioned so as to allow an end of the same on the downstream side to be located ahead of a tip of the spray port (11) on the upstream side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mixes and ejects a plurality of fluids (a powdery substance and the like are also regarded as a kind of fluid) which ejects water and air to spray or atomize water droplets. The present invention relates to a fluid (three or more fluids may be used as long as there are a plurality of fluids) nozzle, and more specifically, to a two-fluid nozzle suitable for a premixing method, in which a plurality of fluids are premixed and then ejected from the nozzle. is there.

[0002]

2. Description of the Related Art A conventional two-fluid nozzle has a premixing system in which a driving gas and a spray liquid are premixed and ejected from the nozzle, and a driving gas whose pressure is released at the nozzle tip is a spray liquid. There is known an injection port direct mixing method such as an example of entraining and spraying. Many of the two-fluid nozzles adopt the latter injection port direct mixing method, and its configuration is shown in FIG.
It looks like. That is, this two-fluid nozzle
The spray liquid pipe 2 is housed inside the driving gas pipe 1 in the form of a concentric double cylinder, the diameter of the tip of the driving gas pipe 1 is gradually reduced, and the pressure is released immediately after the driving gas is compressed. While being sprayed, the liquid discharged from the spray liquid pipe 2 is caught in the spray gas (driving gas), finely pulverized, and atomized / sprayed.

However, the above-mentioned direct mixing method for the injection port is not a problem as long as the spray port diameter of the spray liquid pipe 2 is small and has a small capacity, but the spray port diameter of the spray liquid pipe 2 is large or large. When attempting to spray a large amount of gas, there is a problem in that a large amount of very high pressure driving gas is required and running costs increase. Further, in this injection port direct mixing method, from the relationship of the required pressure of the driving gas with respect to the size of the ejection port diameter of the spray liquid pipe 2,
It is considered unreasonable to increase the spray amount of the spray liquid indefinitely because it is not possible to guarantee that the liquid droplets are atomized reliably, and it is economical to increase the number of nozzles when increasing the spray volume. However, this method also has a problem that the required amount of high-pressure driving gas is doubled.

Therefore, the former premixing method is said to be suitable for large-volume spraying. This premixing scheme is shown in Figure 1.
Explaining in four examples, 10 is a nozzle body, and a drive gas pipe 1 and a spray liquid pipe 2 are connected to the nozzle body 10. The pressure gas is supplied to the driving gas pipe 1 in the direction of arrow A3. Further, the spray liquid is supplied from the spray liquid pipe 2 into the drive gas pipe 1. Then, a collision plate type static mixer 3 is arranged on the downstream side of the spray liquid pipe 2, the driving gas and the spray liquid collide with the collision plate type static mixer 3, and a part of the collision plate type static mixer is provided. When passing over the peripheral standing wall 3a protruding from the peripheral edge of the tech mixer 3 toward the upstream side, the flow direction is changed, and gas and liquid are mixed and atomized by a complicated turbulent atmosphere and collision of fluids. It is designed to work. Further, an injection port 11 is provided on the downstream side of the collision plate type static mixer 3 so that the atomized gas-liquid mixed fluid is discharged from the injection port 11. The example in FIG. 1 is also classified into this preliminary mixing method in principle, and gas-liquid mixing is performed upstream of the tip of the injection port 11.

The conventional example shown in FIG. 14 has a very low pressure loss and a high gas-liquid mixing efficiency. As a result, it has been confirmed that a large amount of spray can be achieved with a small amount of power. In this method, as shown by a high-density region D1 and a low-density region D2 in the figure, the tip of the injection port is in the injection axis direction (a horizontal line (not shown) passing through the center of the injection port 11 in FIG. 14).
The water droplet density was high in the vicinity, and the water droplet density tended to become coarser as the distance from the jet axis increased. That is, it can be observed that this premixing method has a tendency that the spray droplet densities are locally different and there is no uniformity.

When the above-mentioned premixing method was investigated for the cause of the phenomenon that the spray droplet density was locally different, the fluid flowing in the pipe (the flow path of the injection port 11) had a frictional resistance with the inner wall of the pipe. Substances with a high concentration or substances with a high viscosity tend to gather in the center of the pipe. Therefore, when the gas-liquid mixed fluid is jetted from the jet port 11, the driving gas gathers on the inner peripheral surface side of the nozzle, the droplet gathers on the center side, and the high-density region D1 shown in FIG. The low density region D2 is to be generated. In addition, this high-density area D
The occurrence of 1 and the low density region D2 is of course not desirable for uniform spraying, and by preventing the generation of the high density region D1 and the low density region D2, further improvement in efficiency can be achieved / expected. is there.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention has been made in view of the above-mentioned problems, and the droplets can be made finer even if the amount used for the low pressure driving gas is reduced.
It is an object of the present invention to provide a two-fluid nozzle that makes spraying uniform.

[0008]

According to the present invention, in order to achieve the above-mentioned object, a baffle plate 1 is provided at an injection port 11 of a nozzle body 10.
2 is a gap portion 2 that allows fluid to pass through substantially the entire circumference of the peripheral portion.
It is a technical measure that is provided by arranging 0s.

According to the two-fluid nozzle of the above-mentioned claim 1, even if the ejection amount of the driving gas is reduced, the liquid droplets are miniaturized,
It has the effect of being uniformly sprayed. This action will be specifically described with reference to FIG. 1. When the fluid injected in the direction of arrow A1 passes through the gap portion 20, the flow passage area is enlarged, and the downstream side of the baffle plate 12 is in a low pressure state. At the same time, a part of the fluid is entangled in the center side, and a turbulent flow as shown by an arrow A2 is generated. When a low-pressure state portion is generated, substances having a small frictional resistance value and a relatively small specific gravity gather at the low-pressure state portion. Therefore, in the central low-pressure state portion, contrary to the conventional case of FIG. 14, the liquid droplets are in a state in which the mixing ratio of the driving gas is high. And
At the injection destination of the injection port 11, the injection fluid expands or bursts at a stretch, and as a result, the expansion of the driving gas from the center side further reduces the particle size of the droplets and makes them uniform. It exhibits the action described above.

Next, the invention of claim 2 is directed to the nozzle body 10.
A technical means in which an injection port 11 having a non-circular opening inner periphery 11b is provided, and a baffle plate 12 is provided at the injection port 11 with a gap 20 through which fluid can pass around the entire periphery of the injection port 11. Was taken.

Therefore, according to the two-fluid nozzle of the present invention, in addition to the function of the first aspect, the inner peripheral opening 11b of the ejection port 11 is made non-circular so that the ejected fluid is generated at each portion of the inner peripheral opening 11b. There is a difference between the jetting speed and the jetting direction, and as a result, turbulent flow occurs at the jetting tip, collision of jetting fluids occurs, and more reliable gas-liquid mixing and subdivision of droplets are performed. To present.

Next, the invention of claim 3 relates to the nozzle body 10.
The injection port 11 is provided at the tip eccentric position of the
In addition, the baffle plate 12 is provided with a technical means provided by disposing a gap portion 20 through which fluid can pass around substantially the entire periphery of the baffle plate 12.

Therefore, in the two-fluid nozzle of the present invention, in addition to the function of the first aspect, the injection port 11 is provided at the tip eccentric position of the nozzle body 10, so that the gas-liquid mixed fluid is generated by this injection port 11.
There is a time lag in reaching the temperature, and a local pressure difference occurs in the nozzle body 10. As a result, agitation occurs between air streams having different flow velocities, and an effect of improving gas-liquid mixing and droplet segmentation efficiency is exhibited.

Next, the invention of claim 4 is the nozzle body 10.
At the eccentric position of the tip of
1 is provided, and the baffle plate 12 is provided at the injection port 11 and a gap portion 20 through which a fluid can pass is provided at substantially the entire periphery of the baffle plate 12.

Therefore, according to the two-fluid nozzle of the present invention, in addition to the function of the third aspect, the injection port 1 having the non-circular opening inner periphery 11b.
Since No. 1 is used, the operation of claim 2 is also exhibited.

Next, the invention of claim 5 relates to the nozzle body 10.
An injection port 11a having a predetermined flow path length is provided in the interior of the injection port 11a, and a baffle plate 12 is provided by disposing a gap 20 through which fluid can pass around the entire periphery of the injection port 11a. The baffle plate 12 is housed, and the technical means is provided so that the downstream end face of the baffle plate 12 is located upstream of the tip of the injection port 11.

Therefore, in the two-fluid nozzle of the present invention, in addition to the function of the first aspect, the peripheral portion of the downstream side of the baffle plate 12 is still defined (enclosed) by the cylindrical injection port 11. Therefore, even though the gas-liquid mixed fluid passes through the baffle plate 12 and the cross-sectional area of the flow channel is expanded and expanded, there is still no complete pressure solution, and a function of maintaining a pressurized state is exhibited. Then, in the injection port 11 on the downstream side of the baffle plate 12, the atmosphere in which the liquid droplets are mixed with the coarse driving gas is gathered toward the center side, and thereafter, the liquid is injected from the injection port 11 and the pressure is completely released. As a result, the driving gas gathers in the center on the downstream side of the baffle plate 12,
It exerts a function of causing abrupt expansion and contraction due to complete release of pressure, clearly before and after.

In the two-fluid nozzle according to the sixth aspect, the nozzle body 11 has an injection port 11a having substantially the same diameter and a predetermined flow path length.
The baffle plate 12 is accommodated in the ejection port 11a with a gap 20 through which fluid can pass around the perimeter of the ejection port 11a. The baffle plate 12 moves in the ejection axis direction.
It is a technical measure that is equipped with 0.

Therefore, according to the invention of claim 6, the operation of claim 2 is exhibited, and by adjusting the position of the baffle plate 12, the driving gas is centered on the downstream side of the baffle plate 12. This has the effect of making it possible to arbitrarily adjust the time for promoting assembly.

[0020]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the figure, 10 is a nozzle body, and a drive gas pipe 1 and a spray liquid pipe 2 are attached to the nozzle body 10. The left end side of the driving gas pipe 1 in FIG. 1 is connected to a discharge port of a pressure gas supply source (not shown) such as a compressor, and the pressure gas supplied from the pressure air supply source is 1 from the left side to the right side, and is injected in the direction of arrow A2 from the injection port 11 at the right end.

The spray liquid pipe 2 is for feeding the spray liquid into the driving gas pipe 1, and the downstream end of the spray liquid pipe 2 is opened in the driving gas pipe 1. Of course, the left end of the upstream end of FIG. 1 is connected to a supply source (not shown) of the spray liquid. The supply source of the spray liquid may be a simple tank of the spray liquid, but if the spray energy of the driving gas is insufficient to suck the spray liquid, the spray liquid pipe 2
As in the conventional case, a pump or the like (also not shown) for pressure-feeding the sprayed liquid may be provided in the middle of the delivery flow path to.

The driving gas pipe 1 and the spray liquid pipe 2 in FIG. 1 or FIG. 12 have a funnel-shaped portion in which the diameter of the driving gas pipe 1 is gradually reduced toward the tip end side toward the downstream side. 1a is provided, and the tip of the funnel portion 1a on the small diameter side is provided with an injection port 1
1 is set. Further, the spray liquid pipe 2 is formed so that its tip is substantially aligned with the tip portion of the funnel portion 1a on the small diameter side and is concentrically opened. Therefore, in this embodiment, the driving gas flowing through the driving gas pipe 1 is filled with the funnel portion 1a.
Is expanded and expanded by being ejected from the injection port 11, and at the time of this expansion, the spray liquid fed or sucked from the spray liquid pipe 2 is gas-liquid mixed.

The gas-liquid mixing method is not limited to the above-mentioned embodiment, and as described above, a collision plate type static mixer 3 as shown in FIG. 14 may be used. Various other known gas-liquid mixing devices (gas-liquid mixing system) may be used.

In the present invention, the baffle plate 12 is provided at the injection port 11 and the gap portion 20 through which the fluid can pass is arranged substantially all around the peripheral edge portion. The baffle plate 12 having a diameter smaller than that of the ejection port 11 may be provided concentrically with the ejection port 11, but it is not necessarily required to be strictly concentric, and the peripheral portion of the baffle plate 11 is not necessarily required. Any material may be used as long as it forms the gap portion 20 through which the fluid can pass substantially all around. That is,
After the gas-liquid is premixed, the baffle plate 11 is configured so that the baffle plate 11 causes the fluid to flow in a substantially cylindrical shape to reduce its cross-sectional area. Then, the fluid that has passed through the baffle plate 11 portion is depressurized on the downstream side by expanding the flow passage cross-sectional area, and returns from the tubular flow to the columnar or substantially conical columnar flow again. At that time, the baffle 11
A complicated turbulent flow is generated in the downstream part of the and the gas-liquid is stirred. Further, the expansion of the flow passage cross-sectional area causes a depressurized portion, and in the tubular flow, the depressurized portion gathers on the center side of the flow, and the pressure on the center side of the flow becomes low, and this portion is released on the injection tip side. By doing so, it further expands, and the droplets are crushed and atomized.

The gap 20 is generally a ring-shaped opening 20a having the same width as shown most clearly in FIG.
Since it is configured to have a non-circular ring shape, the injection region has a substantially conical shape in which the diameter of the tip is gradually increased. However, other embodiments of the gap portion 20 are possible. First, the gap portion 20 is formed with a substantially kerf-shaped opening 20b whose width is locally changed. That is, as shown most clearly in FIG. 3, the width L2 and the width L3 are not the same. The kerf-shaped opening 20b of which the width locally changes can greatly change the injection conditions such as the injection speed and the injection direction at each part, and the effect that the injection fluids further collide and mix at the injection destination is expected. it can. Also,
As shown in FIG. 3, if the both sides of the kerf-shaped opening 20b are wide and have a horizontally long shape (cat's eye shape), the injection area is substantially elliptical, which is suitable for a wide range of spraying. In the example of FIG. 3, the outer peripheral side contour shape of the kerf-shaped opening 20b (opening inner circumference 11b) is non-circular, but the opening inner circumference 11b may be circular and the baffle plate 12 side may be non-circular. Further, it goes without saying that both the baffle plate 12 and the inner circumference 11b of the opening may have different non-circular shapes.

Further, as shown in FIG. 5, the gap portion 20 may be formed by a substantially crescent-shaped C-shaped kerf-shaped opening 20c. By arranging the C-shaped kerf-shaped opening 20c to face downward, the injection amount can be set lower and the injection amount can be set higher. In addition, the C-shaped kerf-shaped opening 20
Since part c has a discontinuous portion, the baffle plate 12 can be connected and fixed at this discontinuous portion.

Further, as shown in FIG. 6, the gap portion 20 may be constituted by discontinuous openings 20d, 20d, 20d ... Discontinuously arranged on a circumferential line concentric with the nozzle injection axis. Good. These discontinuous openings 20d, 20d, 20d ...
The baffle plate 12 can be fixed at the discontinuous portion, and the ejection direction can be adjusted by changing the shape and arrangement position of the discontinuous openings 20d, 20d, 20d.
In FIG. 6, the discontinuous openings 20d, 20d,
Each of 20d ... Has a circular opening, but as shown by a broken line in the figure, arcuate openings 20e, 20e, 20e.
There is no problem even if the shape is changed to another shape.

The injection port 11 does not necessarily have to be concentric with the drive gas pipe 1, and an injection port 11 eccentric from the drive gas pipe 1 or the nozzle body 10 may be used. . Specifically, as shown in FIG. 8, the tip of the driving gas pipe 1 (nozzle body 10) is closed by an end plate 4, a through hole is provided at an eccentric position of this end plate 4, and this through hole is used as an injection port. It may be used as 11.

The baffle plate 12 is housed in the injection port 11, but according to the result of the trial manufacture, it may be provided substantially directly upstream or downstream of the injection port 11. Then, the position of the baffle plate 12 in the injection axis direction with respect to the injection port 11 was changed and tested. As a result, the baffle plate 12 was positioned substantially immediately upstream of the injection port 11 as shown by a broken line in FIG. In this case, the spray droplets could be made finer and sprayed more uniformly. In addition, in the present application, the baffle plate 12 does not necessarily have to be a plate shape, and may be a columnar shape as shown in FIGS. 4 and 12.

It is also possible to provide a plurality of baffle plates 12, and in ten examples, by installing a required number of end plates 4 each having an injection port 11 and a baffle plate 12, a gas-liquid mixed fluid can be provided in multiple stages. However, the gaps 20, 20, 20 ...
It is designed to pass through.

Needless to say, the baffle plate 12 is fixed by appropriate means. In the examples of FIGS. 3, 4, and 8, the holding column 21 is fixed in the nozzle body 10, and the holding column 21 is fixed.
The baffle plate 12 is connected and fixed to the. Also, FIG. 9 and FIG.
0, the baffle plate 12 has radial fixing claw pieces 12a, 1
2a, 12a ... are projected, and the fixing claw pieces 12a,
12a, 12a ... In the example of FIG.
It is clamped and fixed between a and 4b. In addition, in the example of FIGS. 5 and 6, the baffle plate 12 is integrally fixed to the end plate 4 so that the baffle plate 12 is fixed so as not to be displaced.
In the example, a closing plate 4c, which replaces the end plate 4 at a position recessed from the tip of the injection port 11 by a predetermined distance, is continuously provided.
The gap 20 is opened in c. In addition, this baffle plate 12
It is needless to say that the fixing method of is not limited to these illustrated examples.

Next, the invention of claim 2 relates to the nozzle body 10.
The inner circumference 11b of the opening is provided with a non-circular injection port 11, and the baffle plate 12 is provided at the injection port 11 with a gap 20 through which fluid can pass around substantially the entire periphery of the injection port 11. .
That is, as described above, it has been known from the past that the injection port 11 does not necessarily have to be circular, and that the spray range can be changed by making the opening inner circumference 11b non-circular. However, in the present invention, the combination with the baffle plate 12 causes a large difference in the ejection speed of the fluid ejected from each portion of the inner circumference 11b of the non-circular opening, and the ejected fluids collide with each other even at the ejection destination and the droplets It causes the subdivision of.

In the example of FIG. 3, the non-circular opening inner circumference 11b has a horizontally long elliptical shape (not limited to an elliptical shape, but in consideration of occurrence of clogging or the like, a square or the like has a corner portion). The baffle plate 12 is formed in a circular shape. However, the baffle plate 12 may be formed in an elliptical shape which is slightly smaller than the baffle plate 12, but the width of the gap portion 20 is smaller than that in FIGS. When the droplets are locally changed as described above, the droplets can be subdivided more efficiently.

Next, the invention of claim 3 relates to the nozzle body 10.
The injection port 11 is provided at the tip eccentric position of the
In addition, the baffle plate 12 is provided with a gap portion 20 through which fluid can pass around substantially the entire periphery of the baffle plate 12. this,
As an example of providing the injection port 11 at the tip eccentric position of the nozzle body 10, as shown in FIGS.
The tip of 0 is closed by the end plate 4 and the injection port 11 may be provided at the eccentric position of the end plate 4, but unlike the example shown in the drawing, the tip side of the nozzle body 10 is inclined in a certain direction to be eccentric. Of course it does not matter.

By making the injection port 11 eccentric from the injection center axis in the present invention, as described above, there is a difference in the flow-through time of the fluid before reaching the injection port 11, and the pipe pressure is locally changed. Make a difference. Then, this difference locally affects the ejection direction and causes the fluids to collide with each other, and a turbulent flow is generated to fragment the droplets.

Next, the invention of claim 4 relates to the nozzle body 10.
At the eccentric position of the tip of
1 is provided, and the baffle plate 12 is provided at the injection port 11 with a gap 20 through which fluid can pass around the entire periphery of the baffle plate 12. That is, the present invention is a combination of the configuration in which the injection port 11 of claim 3 is provided at an eccentric position and the configuration in which the opening inner circumference 11b of the injection port 11 in claim 2 is non-circular.

Therefore, the two-fluid nozzle of the present invention exhibits the action and effect of claim 1 by using the baffle plate 12, and further the action and effect of claim 2 by making the inner circumference 11b of the opening non-circular. By presenting the jet port 11 at the eccentric position, the action and effect of claim 3 are exhibited, and by combining these actions and effects (partially synergistic effect can be expected), droplets can be formed with a small amount of power. It is possible to provide a two-fluid nozzle that can be miniaturized.

Next, in the invention of claim 5, the nozzle body 1
No. 0 is provided with an injection port 11a having a predetermined flow path length, and a baffle plate 12 is provided inside the injection port 11a including substantially immediately upstream thereof with a gap 20 through which fluid can pass around the entire periphery of the injection port 11a.
The baffle plate 12 is arranged such that the downstream end face of the baffle plate 12 is located upstream of the tip of the injection port 11.

As the injection port 11 having the predetermined flow path length, the injection port 11 may be formed in a tubular shape as shown in FIGS. 1 and 12, or as shown in FIGS. It suffices to ensure a predetermined flow path length by opening a through hole forming the injection port 11 in a portion having a predetermined thickness (the end plate 4 having a predetermined thickness).
Then, a small-diameter baffle plate 12 is housed in the injection port 11, and a gap portion 20 through which the fluid can pass through substantially the entire circumference of the peripheral portion.
In the present invention, the downstream end face of the baffle plate 12 is located upstream of the tip of the injection port 11, but the baffle plate is provided. 1
If the downstream end surface of 2 is closer to the upstream side than the front end surface of the injection port 11, the baffle plate 12 is not necessarily housed in the injection port 11 and the injection port is opened as shown by a broken line in FIG. It was also useful to locate it at a position just upstream of 11.

When the practical range of the portion just upstream of the injection port 11 was found by experiment, the total area S of the injection port 11 was calculated.
Was obtained, and the effect was recognized as long as it was half or less of the diameter of the circle corresponding to this total area. That is, it is desirable that the distance L4 in FIG.

[0041]

[Equation 1]

Therefore, according to the present invention, the downstream side of the baffle plate 12 is still located in the injection port 11. Then, although it is on the downstream side of the baffle plate 12, the injection port 11
At a portion inside (the portion indicated by reference numeral L1 in FIG. 1), the flow passage cross-sectional area is enlarged, and the jetted gas-liquid mixed fluid expands, but the pressure is not completely released. Will keep. Therefore, at this portion, due to the limited expansion, the turbulent flow generation and the phenomenon in which the atmosphere in which the droplets are coarse and the mixing ratio of the driving gas is high occur on the center side, and thereafter, from the injection port 11. By the injection, the pressure is completely released, and the atmosphere portion having a high mixing ratio of the driving gas on the center side expands suddenly and explosively to effectively divide the droplets.

Next, the invention of claim 6 relates to the nozzle body 10.
Is provided with an injection port 11a having substantially the same diameter and a predetermined flow path length,
A baffle plate 12 is housed in the ejection port 11a with a gap 20 through which fluid can pass around the entire periphery of the ejection port 11a, and the baffle plate 12 is provided with a moving mechanism 30 that moves in the ejection axis direction. Is.

A specific example of the moving mechanism 30 will be described with reference to FIG. 12. A spiral rod portion 12b is continuously provided on the rear end side of the baffle plate 12 whose tip is inserted into the injection port 11, The spiral rod portion 12b is screwed into the rear end surface 1c of the nozzle body 10 and protrudes outward, and the spiral rod portion 12b is screwed forward and backward,
The amount of insertion of the baffle plate 12 into the injection port 11 can be adjusted. In the figure, reference numeral 5 is a spiral rod portion 1.
2b shows a fixing nut 2b.

[0045]

As described above, the present invention can provide a two-fluid nozzle capable of uniformly spraying a large amount of liquid with a small amount of power by changing the jet air flow with the baffle plate 12. . In particular, since the present invention has a very simple structure and can be easily attached to the tip of an existing nozzle, it can be expected that it can greatly contribute to resource saving due to improved efficiency.

In the embodiment of FIG. 7, water and 3 kg / c were used at the upstream side by using the collision plate type static mixer 3 of FIG.
m ² Compressor air is premixed and impingement plate 12
7 was subjected to a spraying experiment at a broken line portion (position of ± 0.5 mm from the start portion of the injection port 11), the following difference was measured in a comparison test with the case where the baffle plate 12 was removed. The utility of the present invention was confirmed. First, in order to obtain an average spray droplet diameter of 15 microns at a water flow rate of 600 cc / min, 120 nl /
Although it was min, 360 Nl when the baffle plate 12 was removed
/ Min of air was required. In addition, 1.2m ³ / H
When the amount of water was 180 Nl / min and the particle size was 20 microns in the two-fluid nozzle of the present invention, when the baffle plate 12 was removed and the amount of air was 220 nl / min, about 10% of the liquid was fog. No spout 1
From 1 the liquid dripped directly and the particle shape was very non-uniform.

[Brief description of drawings]

FIG. 1 is a sectional front view of an essential part showing an embodiment of a two-fluid nozzle of the present invention.

FIG. 2 is a right side view.

FIG. 3 is a right side view of another embodiment.

4 is a vertical cross-sectional view of the example of FIG.

FIG. 5 is a right side view of still another embodiment.

FIG. 6 is a right side view of still another embodiment.

FIG. 7 is a vertical sectional view in still another embodiment.

FIG. 8 is a right side view of still another embodiment.

FIG. 9 is a vertical sectional view of still another embodiment.

FIG. 10 is a vertical sectional view in still another embodiment.

FIG. 11 is a vertical cross-sectional view of still another embodiment.

FIG. 12 is a vertical sectional view in still another embodiment.

FIG. 13 is a vertical sectional view in still another embodiment.

FIG. 14 is a vertical sectional view of a conventional example.

FIG. 15 is a vertical sectional view of another conventional example.

[Explanation of symbols]

11 jets 11a injection port 12 baffle 20 Gap 30 moving mechanism

Claims (6)

[Claims] 1. An injection port (11) of a nozzle body (10)
A two-fluid nozzle in which a baffle plate (12) is provided with a gap portion (20) through which fluid can pass around substantially the entire periphery of the baffle plate (12). 2. An inner circumference of an opening (11) in a nozzle body (10).
b) is provided with a non-circular injection port (11), and the injection port (1)
A two-fluid nozzle having a baffle plate (12) provided in (1) with a gap portion (20) through which a fluid can pass around substantially the entire periphery of the baffle plate (12). 3. A nozzle body (10) is provided with an injection port (11) at an eccentric position at a tip thereof, and a baffle plate (12) is provided at the injection port (11) so that a fluid can pass through substantially the entire circumference of the peripheral portion thereof. A two-fluid nozzle provided by arranging a part (20). 4. The eccentric position of the tip of the nozzle body (10),
The opening inner periphery (11b) is provided with a non-circular injection port (11), and the baffle plate (12) is provided in the injection port (11) with a gap (20) through which fluid can pass almost all around the periphery. A two-fluid nozzle arranged and provided. 5. A nozzle main body (10) is provided with an injection port (11a) having a predetermined flow path length, and a fluid is provided substantially inside the peripheral part of the injection port (11a) including substantially immediately upstream thereof. The baffle plate (12) is accommodated by arranging a gap (20) through which the baffle can pass, and the baffle plate (12) is positioned so that its downstream end face is located upstream of the tip of the injection port (11). Made two-fluid nozzle. 6. A nozzle body (10) is provided with an injection port (11a) having substantially the same diameter and a predetermined flow path length, and the injection port (1) is provided.
1a) accommodates a baffle plate (12) with a gap (20) through which fluid can pass around the perimeter of the peripheral part, and the baffle plate (12) moves in the ejection axis direction. ) Is attached to the two-fluid nozzle.