JP2006167601A - Two-fluid nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inject a gas/liquid mixing mist with strong hitting force from a two-fluid nozzle used as a washing nozzle. <P>SOLUTION: A gas is fed along an axis center line of a nozzle body and a mixing chamber for mixing a liquid to the gas from an outer peripheral direction is provided. An injection chamber is communicated with the mixing chamber and an injection side of the injection chamber is made to a closure part making a distal end surface to a flat surface or a circular surface. A dome-like main hole gradually made to a small diameter toward an apex of a center and having an axial cross section becoming a circular shape is provided at the inside and a mixing fluid is made flowing from the mixing chamber to the main hole. A radial cut-in part is provided on the closure part at the injection side distal end of the injection chamber with a predetermined clearance from an outer peripheral edge. The cut-in part is inclined in a depth direction directed from both ends in a longitudinal direction toward the center and a central part of the cut-in part is communicated with a distal end side of the main hole. A slit-like injection hole spread in a taper shape toward the injection side outer surface is provided making a communication position with the main hole as an inner end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a two-fluid nozzle, and is used for cleaning, cooling, etc., and particularly suitable for fine cleaning of precision parts such as electric and electronic parts, and is strong by reducing the thickness of spray from the nozzle. It generates a striking force to increase the cleaning power.

Conventionally, in the liquid crystal manufacturing process, cleaning after glass cutting and cleaning after development of circuits, etc., require fine cleaning, so use a two-fluid nozzle to mix water with water and atomize the water. Cleaning is performed by injecting the intended gas-liquid mixed mist.
In this type of two-fluid nozzle, it is preferable to increase the spray hitting force by widening the spray distance (length) and enabling cleaning in a wide range, while reducing the spray thickness in the direction orthogonal to the spray length. The nozzle holes are oval or elliptical.

For example, the present applicant has conventionally proposed a two-fluid nozzle 1 shown in FIG. 6 in Japanese Patent Laid-Open No. 2-273565 (Japanese Patent No. 2710398).
In the two-fluid nozzle 1, the injection hole 1 is provided by providing a dome-shaped injection portion 1 a with a cut in the diameter direction. The gas-liquid mixing mist ejected from the ejection holes 3 has a spray pattern that is vertically long along the elliptical shape and thin in the lateral direction.

However, in the two-fluid nozzle, since the groove is cut to the peripheral surface side of the dome-shaped portion and the injection hole is provided, the injection angle becomes wide (80 ° to 120 °). Accordingly, the injection range can be expanded by extending the injection distance in the length direction, but the striking force of the gas-liquid mixing mist becomes weak, and in particular, the gas-liquid mixing mist injected from both sides in the length direction (diameter direction) As the injection amount decreases, the striking force becomes weak and the cleaning power varies. In order to narrow the injection angle, it is necessary to increase the width W in the orthogonal direction. If it is increased, there is a disadvantage that the spray thickness becomes thick and the striking force becomes weak. In addition, there is a problem that if the pressure condition of the gas to be supplied is changed, the injection angle is likely to change.
JP-A-2-273565

  The present invention has been made in view of the above problems, and it is possible to increase the striking force by suppressing the injection angle in the length direction of the gas-liquid mixed mist injected from the slit-like injection hole, and cleaning is performed when the cleaning nozzle is used. The task is to increase the power and make the cleaning power uniform.

In order to solve the above problems, the present invention firstly mixes a gas and a liquid supplied from a gas inlet and a liquid inlet formed in the nozzle body in a mixing chamber, and jets the gas-liquid mixed fluid. In a two-fluid nozzle that ejects gas-liquid mixed mist from an injection hole provided in the chamber,
While supplying a gas along the axial center line of the nozzle body, providing a mixing chamber for mixing the gas from the outer peripheral direction to the gas, and communicating the injection chamber to the mixing chamber,
The injection side of the injection chamber is a closed portion having a tip surface that is a flat surface or an arc surface, and a dome-shaped main section in which the axial cross section gradually decreases in diameter toward the apex of the center and has an arc shape. Providing a hole, allowing a mixed fluid to flow into the main hole from the mixing chamber, and providing a notch in a diametrical direction at the closing portion at the tip of the injection side of the injection chamber with a required clearance from the outer peripheral edge; The incision is inclined in the depth direction from both ends in the length direction, and the central portion of the incision is communicated with the distal end side of the main hole, and the injection side outer surface with the communicating position with the main hole as the inner end There is provided a two-fluid nozzle characterized in that the slit-shaped injection hole that extends in a taper shape is provided.

  With this configuration, the jet angle in the length direction of the gas-liquid mixed mist jetted from the slit-like jet hole can be easily controlled by the inclination angle in the depth direction cut into the jet side outer end surface in the diametrical direction. The injection angle can be made smaller than that of the nozzle of Document 1, the striking force of the gas-liquid mixed mist to be ejected can be increased, and variations in striking force can be suppressed over the entire ejection region. And even if the pressure conditions of the gas to supply are changed, the fluctuation | variation of an injection angle can also be decreased.

Secondly, according to the present invention, the gas and liquid supplied from the gas inlet and the liquid inlet formed in the nozzle body are mixed in the mixing chamber, and the gas-liquid mixed fluid is discharged from the injection hole provided in the injection chamber. In the two-fluid nozzle that injects the liquid mist,
While supplying a gas along the axial center line of the nozzle body, providing a mixing chamber for mixing the gas from the outer peripheral direction to the gas, and communicating the injection chamber to the mixing chamber,
The injection side of the injection chamber has a closed portion with a flat tip surface, and a dome-shaped main hole in which the axial cross section gradually decreases in diameter toward the top of the center and has an arc shape, The mixed fluid is allowed to flow into the main hole from the mixing chamber, and a cut is formed in the closing portion at the tip of the jet side of the jet chamber penetrating in a diametrical direction at a certain depth, and the central portion of the cut is formed as described above. A slit-shaped injection hole is provided in communication with the tip side of the main hole,
A ring surrounding the outer periphery of the injection side is provided, the tip of the ring protrudes to a required position between the cut bottom surface and the outer end surface of the injection side, and the spray angle of the injection hole is adjusted by adjusting the position of the ring tip It is possible to provide a two-fluid nozzle characterized by having a configuration capable of adjusting the pressure.

  In the first two-fluid nozzle, a notch in the diametrical direction is provided on the ejection side outer end surface with a gap from the outer peripheral edge. Therefore, the slit-shaped injection holes can be easily formed with good workability. In addition, since the ring is protruded at both ends in the cut length direction and walls are formed to close both ends in the cut length direction, the injection angle can be easily controlled by the protruding amount of the ring. Therefore, similarly to the first two-fluid nozzle, also in the second two-fluid nozzle, it is possible to increase the striking force of the gas-liquid mixed mist that is ejected with an ejection angle smaller than that of Patent Document 1.

In both the first invention and the second invention, the injection angle θ of the injection hole is preferably 50 to 90 degrees.
If this is 50 degrees or less, the injection distance in the longitudinal direction becomes too short and the spray range becomes too narrow. On the other hand, if the range exceeds 90 degrees and the range is expanded too much, the gas-liquid mixture injected as in Patent Document 1 This is because the strike force of the mist is reduced and the strike force is likely to vary. The injection angle is preferably 60 to 80 degrees.

The mixing chamber is
A first mixing chamber having a cross-sectional taper shape that is reduced in diameter toward the tip side while supplying and mixing liquid to the outer periphery of the gas supplied along the axis;
A large-diameter second mixing chamber communicating with the first mixing chamber via a small-diameter channel;
It is preferable that a stepped wall surface on which an outer peripheral portion of the mixed fluid collides is provided between the second mixing chamber and the ejection chamber having a smaller diameter than the second mixing chamber.
That is, two mixing chambers are provided, and a rectifying chamber is formed by lengthening the small-diameter channel that communicates the first mixing chamber and the second mixing chamber. As described above, after mixing the gas and the liquid in the first mixing chamber, the gas and the liquid are again flowed into the second mixing chamber, and the outer peripheral portion of the mixed fluid is made to collide with the step wall surface in the second mixing chamber. Yes. Since the mixed fluid flows into and mixes with the gas at the center from the outer periphery, the particle size of the outer periphery of the mixed fluid tends to increase, but as described above, the outer periphery of the mixed fluid collides with the stepped wall surface. As a result, the diameter of the droplet can be reduced, and the particle diameter in the ejection region can be made uniform. As a result, a gas-liquid mixed mist having a substantially uniform particle size, gas amount, and liquid amount in the injection region is obtained, and variation in cleaning power within the injection range can be suppressed when the cleaning nozzle is used.

  It is preferable that the length L1 of the injection hole in the outer end surface on the injection side and the width W in the direction orthogonal to the length L1 are L1: W = 3: 1 to 10: 1. If the width W of the injection hole is increased too much with respect to the length L1 of the injection hole, the thickness of the injected gas-liquid mixed mist is not reduced and the striking force is reduced. Since the amount of water adhering increases and the coarsening of the particles and the decrease in speed occur, the width W is preferably in the range of the ratio to the length L1.

  Further, the length L1 of the injection hole on the outer end surface of the injection side and the inner diameter L2 of the inner end of the injection hole are preferably set to L1: L2 = 1.5: 1 to 5: 1. The above-described injection angles of 50 ° to 90 ° can be obtained.

Furthermore, it is preferable that the depth D from the inner end to the outer end of the injection hole and the width W in the orthogonal direction be D: W = 1: 1 to 3: 1.
This is because if the depth D of the injection hole is too deep with respect to the length L1, the amount of water adhering to the wall surface increases, resulting in coarsening of the particles and a decrease in speed, whereas if the depth is too shallow, the injection thickness becomes large. This is because the hitting force is reduced.

It is preferable that both the first and second two-fluid nozzles are integrally assembled by providing a nozzle tip provided with the ejection chamber and the ejection hole as a separate body from the nozzle body.
As described above, when the nozzle tip is a separate body, the nozzle angle can be easily changed by providing in advance nozzle tips having different jetting angles. In addition, when the nozzle hole is clogged, only the nozzle chip can be removed for maintenance.
In addition, you may integrally mold with resin, without making a nozzle main body and a nozzle tip separate.

  In addition, although the supply method of the liquid (water) and gas (air) to the gas-liquid mixing flow path of the said nozzle body is not specified, when raising an air pressure, the structure which does not produce the backflow of the water supplied by this air pressure It is preferable that

  Since both the first and second two-fluid nozzles can increase the striking force by reducing the width of the gas-liquid mixed mist to be injected, they are particularly preferably used as cleaning nozzles and cooling nozzles.

As is apparent from the above description, the two-fluid nozzle according to the present invention can be formed by simply adjusting the injection angle in the length direction of the slit-like injection hole to an arbitrary angle of 90 ° or less. The thickness of the gas-liquid mixed mist can be reduced, and as a result, the striking power can be increased. When the cleaning nozzle is used, the cleaning power can be increased and fine portions can be cleaned. In addition, even when used for cooling, the cooling effect can be enhanced because the striking force is strong.
In addition, since the injection-side tip of the gas-liquid mixing channel is a closed surface, a cut in the diameter direction is provided in the closed surface, and the center of the cut is communicated with the main hole to form a slit-like injection hole. While the gas-liquid mixed fluid goes straight to the injection hole at the central portion of the hole, the gas-liquid mixed fluid at the outer peripheral portion flows into the center and is injected from the injection hole while colliding frontally at the inner end of the injection hole. Therefore, the flow direction and flow velocity of the gas-liquid mixed fluid orthogonal to the slit-shaped injection holes are reduced, and the gas-liquid mixed fluid can be atomized by frontal collision, and the particle size, liquid amount, gas amount in the injection region can be achieved. Is uniform, and there is an advantage that the cleaning power does not vary.

  Moreover, when the nozzle chip | tip which attaches | detaches a nozzle main body so that attachment or detachment is provided, by changing this nozzle chip | tip, while being able to change a spray pattern, it can also be excellent in maintainability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a two-fluid nozzle 10 of the first embodiment.
In the figure, 11 is a nozzle body, 12 is a core, 13 is a nozzle tip, and 14 is a cap, which are assembled from these four parts.

The nozzle body 11 has a substantially cylindrical shape, and is provided with a recess 11a at the tip of the injection side. The nozzle tip 13 is assembled in the recess 11a via the core 12, and the cap 14 is assembled integrally with the nozzle body 11. Yes.
The nozzle main body 11 is provided with a gas flow path 15 along the central axis, and the gas flow path 15 is opened at the base end 11b of the nozzle main body 11 so as to be connected to a gas introduction pipe (not shown). . At the center of the bottom surface of the recess 11a, a small-diameter cylindrical portion 11c constituting the ejection side tip of the gas channel 15 is projected.
In addition, a large-diameter liquid introduction hole 16 that opens to the outer peripheral surface of the nozzle body 11 is provided, the liquid introduction hole 16 is refracted at right angles to the ejection side, and a small-diameter liquid flow path 17 is provided in the axial direction. The front end of the liquid flow path 17 is opened to the outer peripheral position from the bottom surface of the concave portion 11a and from the small diameter cylindrical portion 11c.

The core 12 fitted in the recess 11a is provided with a deep recess 12a at the center of the end surface in contact with the recess bottom, and a shallow recess 12b around the recess 12a. The small diameter cylindrical portion is provided in the recess 12a. 11c is projected to form a gas inflow portion, and the liquid flow path 17 is opened in the recess 12b to form a liquid inflow portion.
A tapered hole 12c having a diameter reduced toward the ejection side is provided continuously to the central recess 12a, and a small-diameter mixing channel 12d is provided at the tip of the tapered hole 12c.
In the core 12 having the shape, gas flows into the central portion, liquid flows into the outer periphery thereof, and is mixed by the tapered hole 12c. The tapered hole 12c becomes the first mixing chamber A.

  As shown in the figure, the nozzle tip 13 connected to the tip end side of the core 12 has a second mixing chamber B composed of a large-diameter hole 13a communicating with a small-diameter mixing channel 12d, and a step in the second mixing chamber B. A dome-shaped main hole E communicating with the wall surface 13b is provided. As shown in the figure, the main hole E has a dome shape in which an axial section having a gradually decreasing diameter toward the top end side has an arc shape.

  The injection tip end surface of the nozzle tip 13 is a flat circular closing portion 13b, and the closing portion 13b is provided with a notch 18 in the diameter direction with a required gap L3 from the outer peripheral edge. The notch 18 is inclined at an angle θ1 in the depth direction from both ends in the length direction X, and the central portion of the notch 18 is communicated with the front end side of the main hole E. Is provided with a slit-like injection hole 20 that extends in a tapered shape toward the outer surface of the injection side. Thus, the slit-like injection hole 20 is provided on the tip side of the dome-like main hole E, and the main term E is used as the injection chamber.

  As shown in an enlarged view in FIG. 2, the slit-shaped injection hole 20 has an elliptical inner end and an elongated rectangular outer end. In the injection hole 20, the length L1 of the injection hole 20 on the injection side outer end surface and the width W in the direction orthogonal to the length L1 are set to L1: W = 3: 1 to 10: 1. In addition, the length L1 and the inner diameter L2 on the long axis side of the inner end serving as the inlet of the injection hole 20 are set to L1: L2 = 1.5: 1 to 5: 1.

Furthermore, the depth D from the inner end to the outer end of the injection hole 20 and the width W in the orthogonal direction are set to D: W = 1: 1 to 3: 1.
Further, the injection angle θ in the length direction of the injection hole 20 is set to be in the range of 50 to 90 degrees. In this embodiment, two types of nozzle chips of 60 degrees and 80 degrees are provided.

Next, the operation of the two-fluid nozzle having the above structure will be described.
The gas (air in the present embodiment) flowing in from the gas flow path 15 is ejected into the recess 12a at the center of the core 12 at the central axis of the nozzle body 11, while the liquid flows into the recess 12b at the outer periphery of the air. The liquid is ejected from the passage 17, and water is mixed in the outer peripheral portion of the air in the first mixing chamber A including the tapered hole 12 c.
Although the air and water are almost entirely mixed by mixing in the first mixing chamber A, the water droplets are relatively large in the outer peripheral portion and the water droplets are small in the central portion. Flows into B. Therefore, in the rectifying chamber B, the air / water mixed liquid with large water droplets flows along the inner wall, and the air / water mixed liquid with small water droplets flows through the central portion.

  The mixed fluid mixed in the first mixing chamber A flows into the second mixing chamber B of the nozzle tip 13 through the small-diameter mixing channel 12d. In the second mixing chamber B, the air / water mixture is diffused, and the mixture at the outer periphery mainly collides with the inner surface of the peripheral wall. Therefore, water droplets having a large particle size at the outer peripheral portion become water droplets having a small particle size, and have a particle size substantially equal to that of the water droplet at the central portion. The air / water mixture having the uniform particle diameter flows into the main hole E while colliding with the stepped wall surface 13b of the injection chamber having a small diameter, and is injected from the slit-like injection hole 20. The sprayed air / water mixture mist has a spray pattern with a wide-angle fan shape and a thin spray thickness due to the shape of the spray hole 20, and has a uniform particle diameter over the entire spray pattern, and substantially both the air amount and the liquid amount. It will be equal.

  Moreover, in the spray pattern, since the spray angle from the slit-shaped spray hole 20 is relatively narrow as 50 to 90 degrees, the striking force of the gas-liquid mixed mist sprayed over the entire length in the length direction is not reduced. A strong striking force can be obtained over the entire area of the spray pattern.

  In addition, in the air-water mixing nozzle in which air is supplied to the central portion of the nozzle and water is supplied to the outer peripheral portion and mixed as in the present invention, the particle size of water droplets on the outer peripheral portion of the mixed liquid is large. It is inevitable. Therefore, when the means for forcibly causing the large water droplets on the outer peripheral portion to collide with the wall surface to reduce the diameter as in the present invention is not used, the particle size of the peripheral portion of the spray pattern is increased. On the other hand, in the present invention, since the diameter is reduced by colliding with the stepped wall surface, it is possible to equalize the particle diameters.

3 (A) and 3 (B) show a modification of the first embodiment, and the outer surface shape of the ejection side tip surface of the nozzle tip 13 'is an arc shape.
Also in this modification, a slit 18 ′ is provided in the diameter direction, the slit is inclined toward the center, and the slit 18 ′ is communicated with the dome-shaped main hole E to provide a slit-shaped injection hole 20 ′. ing.

FIG. 4 shows the second embodiment. The configuration of the gas and liquid mixing unit is changed to be the same as that of FIG. 6, but the configuration of the nozzle tip 22 is the same as that of the first embodiment.
The nozzle body 11 ″ has a horizontally long cylindrical shape, and has large-diameter openings 25 and 26 connected to a gas supply pipe and a liquid supply pipe (not shown) at the left and right ends, respectively, and at the center in the axial direction. In the figure, a concave portion 27 having an open upper surface is provided, and a female screw portion 27a for screwing the cap 23 is formed on the inner peripheral surface of the concave portion 27. Further, the opening portion 25 connected to the gas supply pipe is provided in the opening portion 25. The small-diameter gas flow path 28 formed in a position below the axis of the nozzle body 11 ″ and parallel to the axis is connected. The gas flow path 28 is refracted toward the concave portion 27 at the central portion of the nozzle body 11 '' and opens to the center of the bottom surface of the concave portion, and a partition wall portion 29 is provided in the concave portion along the outer periphery of the opening to provide an orifice. On the other hand, the opening 26 connected to the liquid supply pipe has a small diameter that opens along a shaft line L, that is, on the upper side of the gas flow path 28, to a part of the outer peripheral surface of the recess 27. A liquid channel 31 is formed.

  The core 21 is fitted into the recess 27, the nozzle chip 22 is fitted to the tip of the core 21, and the cap 23 is fitted to the nozzle body 11 with the cap 23 fitted to the core 21 and the nozzle chip 22. The nozzle is assembled by screwing it on.

The core 21 fitted in the recess 27 of the nozzle body 11 ″ has a tapered hole 33 that expands downwardly in a conical shape at the lower part of a small-diameter hole 32 drilled along the axis from the upper end. 33 is disposed so as to surround the partition wall portion 29 with a space therebetween, in which the space between the outer wall of the upper end portion of the partition wall portion 29 and the inner wall of the tapered hole 33 is narrowed, and this narrow space is formed. With this configuration, the gas is ejected to the central portion of the tapered hole 33 and the liquid is ejected to the outer peripheral portion of the gas. In the first mixing chamber A, the liquid is supplied to the outer peripheral portion of the gas and mixed.
The small-diameter hole 32 communicating with the taper hole 33 is set to be relatively long to form a long rectifying chamber so that the rectifying action of the mixed fluid mixed in the first mixing chamber A is sufficiently performed. .

  As in the first embodiment, the nozzle tip 22 is provided with a second mixing chamber B composed of a large-diameter chamber 22a communicating with the rectifying chamber of the core 21. The second mixing chamber B is longer than the second mixing chamber of the first embodiment. The second mixing chamber B is communicated with a main hole E similar to that of the first embodiment through a step wall surface 22b. A configuration in which a slit is provided in the tip closing portion of the main hole E to provide a slit-like injection hole 20 'is the same as in the first embodiment.

Explaining the operation of the two-fluid nozzle of the second embodiment, the gas (air in the present embodiment) flowing in from the gas flow path 28 enters the first mixing chamber A from the orifice in the central axis portion of the nozzle body 11 ″. The liquid (water in this embodiment) that has been ejected and flows into the outer peripheral portion of the air is ejected from the orifice, and water is mixed from the outer peripheral portion of the air.
Although the air and water are almost entirely mixed by mixing in the first mixing chamber A, the water droplets are relatively large in the outer peripheral portion and the water droplets are small in the central portion. Flow into. Therefore, in the rectifying chamber, the air / water mixture having a large water droplet flows along the inner wall, and the air / water mixture having a small water droplet flows in the center.

  The gas / water mixture sprayed into the second mixing chamber B having a larger diameter than the tip of the rectifying chamber diffuses, and mainly the liquid mixture in the outer peripheral portion collides with the stepped wall 24 on the front surface. Therefore, water droplets having a large particle size at the outer peripheral portion become water droplets having a small particle size, and have a particle size substantially equal to that of the water droplet at the central portion. The air / water mixture having a uniform particle size flows into the main hole E of the injection chamber having a small diameter and is injected from the slit-like injection hole 42. The sprayed air / water mixture mist has a spray pattern with a wide-angle fan shape and a thin spray thickness due to the shape of the spray hole 20 ′, and has a uniform particle diameter over the entire spray pattern, and has both an air amount and a liquid amount. It becomes almost equal.

FIG. 5 shows a third embodiment.
In the third embodiment, the configuration of the injection hole 20 ″ provided in the nozzle tip 13 ″ is changed from that of the first embodiment.
The circular closing part 13b ″ at the tip of the injection side of the nozzle tip 13 ″ is provided with a notch 18 ″ having a constant depth in the diameter direction. That is, in the first to third embodiments, the notch is outside. Although a required dimension is formed from a peripheral edge, the fourth embodiment can pass through a notch 18 ″. When penetrating in this way, the workability can be improved, but the slit-shaped injection holes to be formed are open at both ends in the length direction, and the injection angle becomes 180 degrees or more.
Therefore, the ring 55 is attached to the outer peripheral surface of the nozzle tip 13 ″, and the length of the ring 55 is opened by projecting the tip position of the ring 55 between the inner end position of the injection hole 42 ″ and the outer end position of the nozzle tip. Closers for controlling the injection angle are provided at both ends in the direction. Specifically, a male screw is provided on the outer peripheral surface of the nozzle tip 22 ″, while the ring 55 is press-fitted and the injection angle is set to 60 to 80 °.

  Needless to say, the configuration of the third embodiment may be applied to the nozzle chip of the second embodiment.

  The two-fluid nozzle of the present invention can increase the striking force of the gas-liquid mixed mist injected from the slit-shaped injection hole over the entire injection region, and can equalize droplets in the gas-liquid mixed mist with a small particle size. The spray range is small even if the supply pressure fluctuates somewhat, so it is not only suitable for use as a cleaning nozzle, but also suitable for cooling, coating, and spraying. Can do.

It is sectional drawing of the two-fluid nozzle of 1st Embodiment of this invention. (A) and (B) are the principal part enlarged views of 1st Embodiment. (A) (B) is drawing which shows the principal part of the modification of 1st Embodiment. It is sectional drawing of the two-fluid nozzle of 2nd Embodiment. It is principal part sectional drawing of the two-fluid nozzle of 3rd Embodiment. It is drawing which shows a prior art example.

Explanation of symbols

10 Two-fluid nozzle 11 Nozzle body,
13 Nozzle tip 20 Injection hole A 1st mixing chamber,
B Second mixing chamber E Main hole (jet chamber)

Claims (7)

Gas and liquid supplied from a gas inlet and a liquid inlet formed in the nozzle body are mixed in a mixing chamber, and the gas-liquid mixed mist is injected from an injection hole provided in the injection chamber. In the fluid nozzle,
While supplying a gas along the axial center line of the nozzle body, providing a mixing chamber for mixing the gas from the outer peripheral direction to the gas, and communicating the injection chamber to the mixing chamber,
The injection side of the injection chamber is a closed portion having a tip surface that is a flat surface or an arc surface, and a dome-shaped main section in which the axial cross section gradually decreases in diameter toward the apex of the center and has an arc shape. Providing a hole, allowing a mixed fluid to flow into the main hole from the mixing chamber, and providing a notch in a diametrical direction at the closing portion at the tip of the injection side of the injection chamber with a required clearance from the outer peripheral edge; The incision is inclined in the depth direction from both ends in the length direction, and the central portion of the incision is communicated with the distal end side of the main hole, and the injection side outer surface with the communicating position with the main hole as the inner end A two-fluid nozzle characterized by having a slit-like injection hole that extends in a tapered shape toward the nozzle. Gas and liquid supplied from a gas inlet and a liquid inlet formed in the nozzle body are mixed in a mixing chamber, and the gas-liquid mixed mist is injected from an injection hole provided in the injection chamber. In the fluid nozzle,
While supplying a gas along the axial center line of the nozzle body, providing a mixing chamber for mixing the gas from the outer peripheral direction to the gas, and communicating the injection chamber to the mixing chamber,
The injection side of the injection chamber has a closed portion with a flat tip surface, and a dome-shaped main hole in which the axial cross section gradually decreases in diameter toward the top of the center and has an arc shape, The mixed fluid is allowed to flow into the main hole from the mixing chamber, and a cut is formed in the closing portion at the tip of the jet side of the jet chamber penetrating in a diametrical direction at a certain depth, and the central portion of the cut is formed as described above. A slit-shaped injection hole is provided in communication with the tip side of the main hole,
A ring surrounding the outer periphery of the injection side is provided, the tip of the ring protrudes to a required position between the cut bottom surface and the outer end surface of the injection side, and the spray angle of the injection hole is adjusted by adjusting the position of the ring tip A two-fluid nozzle characterized by having a configuration capable of adjusting the pressure.   The two-fluid nozzle according to claim 1, wherein an injection angle θ of the injection hole is 50 to 90 degrees. The mixing chamber is
A first mixing chamber having a cross-sectional taper shape that is reduced in diameter toward the tip side while supplying and mixing liquid to the outer periphery of the gas supplied along the axis;
A large-diameter second mixing chamber provided with a small-diameter channel in between the first mixing chamber,
4. The step wall surface on which the outer peripheral portion of the mixed fluid collides is provided between the second mixing chamber and the jet chamber having a smaller diameter than the second mixing chamber. The two-fluid nozzle described in 1. The length L1 of the injection hole in the outer end surface of the injection side and the width W in the direction orthogonal to the length L1 are L1: W = 3: 1 to 10: 1, and
The length L1 and the inner diameter L2 of the inner end of the injection hole are L1: L2 = 1.5: 1 to 5: 1, and
5. The depth D from the inner end to the outer end of the injection hole and the width W in the orthogonal direction are set to D: W = 1: 1 to 3: 1. The two-fluid nozzle described in the above.   The two-fluid nozzle according to any one of claims 1 to 5, wherein the nozzle tip provided with the injection chamber and the injection hole is provided separately from the nozzle body and is assembled integrally.   The two-fluid nozzle according to any one of claims 1 to 6, wherein the two-fluid nozzle is a washing nozzle.

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