JP2006167599A - 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 main flow passage fed with a gas and a liquid feed passage opened to a peripheral surface of a gas/liquid mixing part provided on the main flow passage are provided on a nozzle body. The liquid fed from the liquid feed passage is mixed to the gas circulated in the main flow passage by side surface collision. An injection side distal end of the main flow passage for circulating the gas/liquid mixing fluid mixed at the gas/liquid mixing part to the injection side is made to a closure part made 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 the main hole is communicated with the main flow passage to make the mixing fluid flowing. A radial cut-in part is provided on the closure part at the injection side distal end 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. 8 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 fluctuate.

Further, in this type of two-fluid nozzle, there is a demand for a nozzle having a low air-water ratio for the purpose of energy saving.
However, when the amount of liquid with respect to the amount of gas is increased, there is a drawback in that the atomization characteristic is deteriorated because the flow path is not provided on the side surface of the gas passage. On the other hand, when the flow path is provided on the side surface, there is a problem that when the amount of liquid with respect to the gas amount is reduced, the air supplied to the main flow path flows backward through the orifice of the liquid flow path and normal spraying cannot be performed.
JP-A-2-273565

  The present invention has been made in view of the above problems, and firstly, by increasing 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, In this case, it is an object to increase the cleaning power and make the cleaning power uniform. Secondly, the problem is to make the atomization characteristics not deteriorate even if the air-to-water ratio is lowered, and to prevent air from flowing back to the liquid supply path even if the air-to-water ratio is increased.

In order to solve the above problems, the present invention firstly includes a main flow path through which gas is supplied to the nozzle body, and a liquid supply path that opens to the peripheral surface of the gas-liquid mixing section provided in the main flow path. The liquid supplied from the liquid supply path is mixed with the gas flowing through the main flow path by side collision, and the liquid supply path includes a base end flow path that is continuous with the liquid supply pipe and the gas-liquid Between the peripheral surface opening of the mixing portion, at least a first orifice that opens to the peripheral surface of the gas-liquid mixing portion, a diameter-enlarging channel that is continuous upstream of the first orifice, and a first orifice that is continuous upstream of the diameter-enlarging channel Two orifices are provided continuously, and a multi-stage orifice is provided.
The front end of the main flow path through which the gas-liquid mixed fluid mixed in the gas-liquid mixing section flows to the injection side is a closed portion having a flat surface or a circular arc surface, and at the center, at the top of the center A dome-shaped main hole having an arc-shaped cross-section with a gradually decreasing diameter toward the arc, the main hole communicating with the main flow path to allow the mixed fluid to flow; and
A diametrical cut is provided in the closing portion at the injection side tip with a required gap from the outer peripheral edge, and the cut is inclined in the depth direction from both ends in the length direction, and the central portion of the cut And a slit-like injection hole that extends in a tapered manner toward the outer surface of the injection side with the position of communication with the main hole as an inner end. Provides nozzles.

  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 made small.

In addition, a liquid supply path for supplying a liquid to the gas-liquid mixing section of the main flow path through which the gas flows is provided, and a second orifice is further provided to the first orifice opening on the peripheral surface of the gas-liquid mixing section via the enlarged diameter flow path. Since the multi-stage orifice is provided in the liquid supply path, even if the gas flows backward to the first orifice, the gas pressure is reduced in the enlarged diameter flow path, and it is difficult for the gas to flow backward to the second orifice. When the liquid flowing into the second orifice increases the liquid pressure, the gas can be pushed back to prevent the gas from flowing back to the liquid supply path.
Although it is essential to provide at least two-stage orifices of a first orifice and a second orifice across the diameter-enlarged flow path, a third orifice is further provided on the first orifice via a second diameter-enlarged flow path. The number of orifices is not limited.

Secondly, the present invention comprises a main flow path through which the gas is supplied to the nozzle body and a liquid supply path that opens to the peripheral surface of the gas-liquid mixing section provided in the main flow path. The liquid to be supplied is mixed with the gas flowing through the main flow path by a side collision, and the liquid supply path includes a base flow path that is continuous with the liquid supply pipe, and a peripheral surface opening of the gas-liquid mixing section. In between, there are continuously provided at least a first orifice that opens to the peripheral surface of the gas-liquid mixing section, a diameter-enlarging passage that is continuous upstream of the first orifice, and a second orifice that is continuous upstream of the diameter-enlarging passage. And having a multi-stage orifice,
The front end of the main flow path through which the gas-liquid mixed fluid mixed in the gas-liquid mixing section flows to the injection side is a closed portion having a flat surface, and gradually inside the center toward the top of the center. Providing a dome-shaped main hole having a small-diameter axial cross-section in an arc shape, allowing the mixed fluid to flow through the main hole in communication with the main flow path; and
In the closing portion at the tip of the injection side, a notch penetrated in a diametrical direction at a certain depth is provided, and a slit-like injection hole is provided by communicating a central portion of the notch 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 is projected to a required position between the cut bottom surface and the outer end surface of the injection side, and the position of the tip of the ring is adjusted to spray the injection hole. Provided is a two-fluid nozzle characterized in that the angle can be adjusted.

  In the two-fluid nozzle of the first invention described above, a cut in the diametrical direction is provided on the outer end surface of the ejection side with a gap from the outer peripheral edge. However, in the two-fluid nozzle of the second invention, a constant depth penetrating in the diametrical direction Since the slits are formed, 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 two-fluid nozzle of the first invention, also in the two-fluid nozzle of the second invention, the striking force of the gas-liquid mixed mist to be ejected is made smaller than that of the above-mentioned Patent Document 1. be able to.

It is preferable that the liquid supply path communicates in a direction orthogonal to the main flow path.
With this configuration, since the liquid is discharged from the first orifice of the liquid supply path from the direction orthogonal to the gas, gas-liquid mixing due to side collision with the gas can be promoted.
However, even if the liquid supply path is inclined with respect to the main flow path, a back flow of gas to the liquid supply path may occur if the amount of liquid is reduced. The present invention can also be suitably applied to the case where the main channel is inclined and communicated.

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.

  It is preferable that the length L1 of the injection hole on 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. 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 angle of 50 to 90 degrees can be obtained.

Further, the depth D from the inner end to the outer end of the injection hole and the width W in the orthogonal direction are preferably 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 width W, the amount of water adhering to the wall surface increases, resulting in coarsening of the particles and a decrease in speed, whereas if it 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 injection chamber and the injection 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.

  Further, a recess is provided on the peripheral surface of the main flow path where the liquid supply path is opened, the bottom area of the recess is larger than the inner diameter L1 of the first orifice, and the first orifice is opened at the center of the bottom of the recess. May be. As described above, when the recess is provided at the opening position of the liquid supply path, the gas does not directly flow back to the opening of the first orifice of the liquid supply path, and the gas temporarily accumulates in the recess, so that the backflow of the gas is suppressed. be able to.

Furthermore, it is preferable that the inner diameter L2 of the enlarged flow path of the liquid supply path is 1.5 to 3 times the inner diameter L1 of the first orifice.
Further, the length H3 of the expanded diameter channel may be 1.0 times or more of the inner diameter L2 of the expanded diameter channel, and preferably 1.0 times or more and 10 times or less.
If the inner diameter and the length of the enlarged flow channel are set between the first orifice and the second orifice, the liquid flow rate is set to 1:20 even when the liquid pressure is 1:20 with the gas pressure kept constant. It is possible to prevent the backflow of gas.
Furthermore, a diameter-reduced portion having a tapered peripheral surface may be provided at the distal end of the diameter-enlarging flow path communicating with the first orifice and the distal end of the proximal-end flow path communicating with the second orifice.

Furthermore, it is preferable to provide an orifice in the gas-liquid mixing flow path that reaches from the gas-liquid mixing portion to the slit-shaped injection hole provided on the tip side of the dome-shaped main hole.
When the amount of liquid is reduced in the two-fluid nozzle, gas-liquid mixing in the gas-liquid mixing unit is not sufficiently performed, and a hunting phenomenon in which liquid and gas are alternately ejected from the ejection holes tends to occur. When the hunting phenomenon occurs, a pressure fluctuation is caused in the gas-liquid mixed fluid, which affects the pressure of the mixed portion of the liquid and gas. For this reason, an orifice is provided on the jet side of the liquid and gas mixing section, and the pressure fluctuation due to the hunting phenomenon is reduced by the orifice before reaching the gas-liquid mixing section, so that the liquid-gas mixing section is not affected. Even if the supply amount decreases, gas-liquid mixing can be sufficiently performed, and based on this, the hunting phenomenon can be quickly terminated to increase the injection accuracy.

  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.

In addition, a liquid is supplied from the side to the main channel to which the gas is supplied along the axial direction, and mixed with the gas by side collision, and the liquid channel has an upstream of the first orifice that opens to the main channel. Since the second orifice is provided through the enlarged diameter flow path and the orifice is formed in a plurality of stages, even if the gas flows backward to the first orifice, the gas pressure is reduced in the enlarged diameter flow path and the liquid pressure is high in the second orifice. Therefore, the gas cannot flow back to the second orifice, and the backflow of gas to the liquid channel can be prevented.
Thus, since the gas backflow prevention function is provided, the control range of the turndown ratio of the liquid flow rate can be increased, and therefore the liquid flow rate can be easily adjusted according to the object to be injected with the gas-liquid mixture, In addition, it has the advantage that energy can be saved and water can be saved easily.

  In addition, when a nozzle tip that is detachably assembled with the nozzle body is provided, the spray pattern can be changed and the maintainability can be improved by exchanging the nozzle tip.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a two-fluid nozzle 10 of the first embodiment.
The two-fluid nozzle 10 includes a nozzle body 11, a nozzle tip 12, and a liquid supply adapter 15 as main components, and these are assembled and integrated.

The nozzle body 11 passes through the main flow path 13 along the axis, and the base end of the main flow path 13 is a large-diameter gas supply pipe connecting portion 13a. A screw is engraved on the inner peripheral surface and connected to the gas supply pipe 14 by screw tightening.
The main channel 13 is provided with an orifice 13b composed of a small-diameter channel following the gas supply pipe connecting portion 13a, and a gas-liquid mixing unit 13c having a larger diameter is provided downstream of the orifice 13b. A gas-liquid mixing channel 13d having the same diameter is provided on the ejection side, and a mixing chamber 13e having a large diameter on the tip side is provided.

  The nozzle body 11 is formed with a hole 11a penetrating through the outer peripheral surface in a direction orthogonal to the main flow path 13 in the peripheral wall of the gas-liquid mixing portion 13c, and a small diameter hole and a large diameter opening the hole 11a into the main flow path 13. The liquid supply adapter 15 is screwed into the large-diameter hole, and the small-diameter hole is used as a first orifice of the liquid supply path described later.

  The liquid supply adapter 15 is provided so as to penetrate the liquid flow path along the axial center, and has a large-diameter liquid supply pipe connecting portion 15a at the downstream end on the base end side, and a screw is engraved on the inner peripheral surface thereof. Then, it is connected to the liquid supply pipe 18 by screw tightening. The inner end side of the liquid supply pipe connecting portion 15a is tapered so as to communicate with the second orifice 15b having a small diameter, and the diameter-enlarged flow path 15c communicates with the second orifice 15b. The diameter-enlarged flow path 15c communicates with the small-diameter hole of the adapter hole 11a, and the small-diameter hole serves as a first orifice 15d.

As described above, the liquid supply pipe connecting portion 15a, the second orifice 15b, the diameter-enlarging channel 15c, and the first orifice 15d are formed in a direction orthogonal to the axial direction with respect to the gas-liquid mixing portion 13c into which gas flows in from the axial direction. A liquid channel 16 is provided, and the liquid is discharged to the gas-liquid mixing unit 13c through the liquid channel 16 to be mixed with the gas by side collision.

The inner diameter L1 of the first orifice 15d is larger than the inner diameter L3 of the second orifice 15b (L1> L3), and L1 is 1.5 times L3. On the other hand, the length H1 of the first orifice 15d is smaller than the length H2 of the second orifice 15b (H1 <H2), and H2 is approximately three times H1.
Further, the inner diameter L2 of the diameter-enlarged flow path 15c is approximately twice the inner diameter L1 of the first orifice 15d, and the length H3 is not less than five times the first orifice 15d.

  A screw 11b is provided on the outer peripheral surface on the front end side of the nozzle body 11, and a flange 12a protruding from the outer peripheral surface is provided on the nozzle tip 12 joined to the front end surface of the nozzle main body 11, and a stopper 16 is provided on the flange 12a. The nozzle tip 12 is fixed to the tip of the nozzle body 11 by being screwed onto the screw 11b.

  The nozzle tip 12 is provided with a dome-shaped main hole 12 b communicating with the main flow path 13 of the nozzle body 11. As shown in the figure, the main hole 12b has a dome shape in which the axial cross section gradually decreases in diameter toward the top end side and has an arc shape. In addition, the inner diameter of the main hole 12b is made smaller than the inner diameter of the mixing chamber 13e of the nozzle body 11, and a stepped wall surface 12f is formed at the joint.

  The injection tip end surface of the nozzle tip 12 is a flat circular closing portion 12c, and the closing portion 12c is provided with a notch 12d in the diametrical direction with a required gap L3 from the outer peripheral edge. The notch 12d 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 12d is communicated with the distal end side of the main hole 12b, and the communication position with the main hole 12b. 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 12b, and the main hole 12b is used as the injection chamber.

  As shown in FIG. 2 in an enlarged manner, the slit-shaped injection hole 20 has an inner end 20a having an elliptical shape and an outer end 20b having an elongated rectangular shape. 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.
First, in the two-fluid nozzle 10 of the present embodiment, the flow rate or pressure of air (gas) that flows in from the gas flow path 13b along the axial direction of the main flow path 13 of the nozzle body 11 is maintained substantially constant. (Liquid) supply amount (turndown ratio) is adjusted.
When the supply amount of water is reduced, the liquid pressure in the gas-liquid mixing unit 13 c becomes smaller than the pressure of the gas-liquid mixed fluid, and air may flow back to the liquid channel 16. In that case, even if the gas flows into the first orifice 15d, since the diameter-enlarged flow path 15c exists on the upstream side thereof, the gas pressure decreases, and it is difficult for the gas to flow back to the second orifice 15b. Since the liquid pressure is high at the orifice 15b, the backflow of air can be reliably prevented at the second orifice 15b.

  Thus, the gas-liquid mixed fluid mixed in the gas-liquid mixing part 13c of the nozzle body 11 flows into the dome-shaped main hole 12b of the nozzle tip 12 through the gas-liquid mixing channel 13d and the mixing chamber 13e. At that time, the particles collide with the step wall surface 12f, and the particles are atomized. The gas-liquid mixed fluid that has flowed into the main hole 12 b is ejected from the slit-shaped ejection hole 20. The sprayed air / water mixed mist has a spray pattern with a wide-angle fan shape and a thin spray thickness according to the shape of the spray hole 20, and has a uniform particle diameter over the entire spray pattern, and an air amount and a liquid amount. Both are substantially 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 12f, it is possible to equalize the particle diameters.

FIG. 4 shows a modification of the first embodiment in which the tip closing portion 12c ′ of the nozzle tip 12 ′ has an arc shape. A notch 12d ′ is provided on the arc-shaped closed surface as in the first embodiment, and a slit-like injection hole 20 ′ communicating with the main hole 12b is provided.
Even if it is set as this structure, it has an effect | action similar to 1st Embodiment.

5A and 5B show a second embodiment.
In 2nd Embodiment, the structure of the injection hole provided in a nozzle chip is changing 1st Embodiment.
As shown in FIG. 8, a circular closing portion 12c ″ at the tip of the injection side of the nozzle tip 12 ″ is provided through a notch 12d ″ having a constant depth in the diameter direction. That is, in the first embodiment. The notch is formed with a required dimension from the outer peripheral edge, but in the second embodiment, the notch 12d ″ is penetrated. 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 30 is attached to the outer peripheral surface of the nozzle tip 12 ″, and the tip 30 is protruded H between the inner end position of the injection hole 20 ″ and the outer end position of the nozzle tip, so that the opening length is long. Closers for controlling the injection angle are provided at both ends in the direction. Specifically, the ring 30 is press-fitted into the nozzle tip 12 ″, and the injection angle is set to 60 ° to 80 °.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 6 shows a third embodiment, in which the configuration of the gas and liquid mixing portion in the nozzle body is changed.
In the adapter 15 ′, a liquid supply pipe connecting portion 15a ′, a second orifice 15b ′, an enlarged flow passage 15c ′, and a first orifice 15d ′ are provided at the downstream end of the enlarged flow passage 15c ′. The tip portion provided with the first orifice 15d ′ is protruded from the inner peripheral surface into the gas-liquid mixing portion 13c ′ of the nozzle body 11 ′.

Furthermore, the configuration shown in FIGS. 7A to 7D may be adopted. In FIG. 7A, the inner diameter L1 of the first orifice 15d is set smaller than the inner diameter L3 of the second orifice 15b. As described above, when the inner diameter L1 of the first orifice 15d is reduced, the liquid pressure discharged to the gas-liquid mixing unit 13c can be increased.
In (B), a recess 13e is provided on the inner peripheral surface of the gas-liquid mixing portion 13c, and a first orifice 15d is opened on the bottom surface of the recess 13c. If it is set as this composition, since gas will once accumulate in crevice 13e, backflow of gas can be controlled.
In (C), the third orifice 15e ′ is provided in the second orifice 15b via the second enlarged flow passage 15f ′, and the orifice has three stages. Thus, when the number of orifices is increased, the function of preventing gas backflow can be enhanced.
In (D), a liquid supply adapter 15 ″ is attached to the nozzle body 11 ″ at an inclination. This corresponds to the case where it is necessary to install the adapter 15 ″ at an inclination depending on the piping space or the like. In this case as well, it is possible to prevent the gas from flowing back into the liquid flow path.

  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 which shows 1st Embodiment of this invention. It is an enlarged view of an injection part, (A) is a side view and (B) is an AA line sectional view of (A). It is an enlarged view of the gas-liquid mixing part of FIG. (A) (B) is drawing which shows the modification of 1st Embodiment. (A) is sectional drawing which shows 2nd Embodiment, (B) is an enlarged view which shows an injection part. It is principal part sectional drawing of 3rd Embodiment. (A)-(D) are drawings which show a modification. It is sectional drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Two-fluid nozzle 11 Nozzle body 12 Nozzle tip 12b Main hole 12d Notch 13 Main flow path 13c Gas-liquid mixing part 15 Adapter 15a Liquid supply pipe | tube connection part 15b 2nd orifice 15c Diameter expansion flow path 15d 1st orifice 16 Liquid flow path 18 Liquid supply Tube 20 injection hole

Claims (7)

The nozzle body includes a main flow path for supplying a gas and a liquid supply path that opens to a peripheral surface of a gas-liquid mixing section provided in the main flow path, and the liquid supplied from the liquid supply path is supplied to the main flow path The liquid supply path is mixed at least between the base end flow path connected to the liquid supply pipe and the peripheral surface opening of the gas-liquid mixing section. A first orifice that opens on the peripheral surface of the mixing portion, a diameter-enlarging channel that is continuous upstream of the first orifice, a second orifice that is continuous upstream of the diameter-enlarging channel, and a multistage orifice are provided. further,
The front end of the main flow path through which the gas-liquid mixed fluid mixed in the gas-liquid mixing section flows to the injection side is a closed portion having a flat surface or a circular arc surface, and at the center, at the top of the center A dome-shaped main hole having an arc-shaped cross-section with a gradually decreasing diameter toward the arc, the main hole communicating with the main flow path to allow the mixed fluid to flow; and
A diametrical cut is provided in the closing portion at the injection side tip with a required gap from the outer peripheral edge, and the cut is inclined in the depth direction from both ends in the length direction, and the central portion of the cut And a slit-like injection hole that extends in a tapered manner toward the outer surface of the injection side with the position of communication with the main hole as an inner end. nozzle. The nozzle body includes a main flow path for supplying a gas and a liquid supply path that opens to a peripheral surface of a gas-liquid mixing section provided in the main flow path, and the liquid supplied from the liquid supply path is supplied to the main flow path The liquid supply path is mixed at least between the base end flow path that is continuous with the liquid supply pipe and the peripheral surface opening of the gas-liquid mixing section. A first orifice that opens on the peripheral surface of the mixing portion, a diameter-enlarging channel that is continuous upstream of the first orifice, a second orifice that is continuous upstream of the diameter-enlarging channel, and a multistage orifice are provided. further,
The front end of the main flow path through which the gas-liquid mixed fluid mixed in the gas-liquid mixing section flows to the injection side is a closed portion having a flat surface, and gradually inside the center toward the top of the center. Providing a dome-shaped main hole having a small-diameter axial cross-section in an arc shape, allowing the mixed fluid to flow through the main hole in communication with the main flow path; and
In the closing portion at the tip of the injection side, a notch penetrated in a diametrical direction at a certain depth is provided, and a slit-like injection hole is provided by communicating a central portion of the notch 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 is projected to a required position between the cut bottom surface and the outer end surface of the injection side, and the position of the tip of the ring is adjusted to spray the injection hole. A two-fluid nozzle characterized in that the angle can be adjusted.   The two-fluid nozzle according to claim 1, wherein the liquid supply path communicates with the main flow path in an orthogonal direction.   The two-fluid nozzle according to any one of claims 1 to 3, wherein an injection angle θ of the slit-like injection hole is 50 to 90 degrees. 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 main hole 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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