JP6586125B2 - Mist generator - Google Patents

Description

  The present invention relates to a mist generator.

  When water is pressurized and discharged from a nozzle having a small diameter, the liquid column coming out of the nozzle is formed into droplets based on the theory such as Rayleigh instability. The stronger the pressure, the smaller the droplet diameter and the more it becomes mist. The mist is a water droplet having a diameter of several μm to several hundred μm (average particle diameter), and includes the concept of so-called dry mist and splash mist (the same applies hereinafter). The average particle diameter of the mist is obtained, for example, as a Sauter average value (total volume / total surface area) by obtaining a particle size distribution by a Fraunhofer analysis method using a He—Ne laser.

  When a single-hole nozzle having a simple configuration is used, a high pressure of, for example, 5 MPa or more is required to obtain a mist state. Such a high-pressure system requires a high-pressure pump such as a plunger type, a pressure-resistant hose, and the like, which inevitably leads to an increase in equipment size and an increase in energy consumption (an increase in running cost).

  There is also known a mist generating device that generates mist by joining and colliding fluids having different phases, for example, water and air in the nozzle or in the vicinity of the nozzle outlet. For example, water is pumped and supplied to the center hole of a nozzle having a double-pipe structure, air is pumped and fed from the outer periphery, merged at the nozzle tip, and atomized. In the two-fluid system, since the intermolecular bonds of the liquid can be broken by the collision energy of the gas, there is an advantage that a low pressure can be realized as compared with the one-fluid / high-pressure system.

  In Patent Document 1, a liquid flow path is provided along the central axis, and an annular gas flow path is provided on the outer periphery, and each is joined a plurality of times to achieve primary atomization, secondary atomization, and tertiary atomization. A fluid nozzle is disclosed. The supply pressure of the liquid and gas is in the range of 0.2 to 0.6 MPa.

JP 2002-159889 A

Yoshinori Naramoto, “Flow Mode and Nonlinear Characteristics of Gas-Liquid Two-Phase Flow” [online], The University of Tokyo Graduation Thesis, filed February 7, 2003, [March 31, 2017 search]

  The conventional two-fluid type, which generates mist by joining and colliding different-phase fluids in the nozzle or near the nozzle outlet, can achieve low pressure, but the nozzle configuration is complicated, resulting in increased manufacturing costs and foreign matter. It is inevitable that maintenance work will become troublesome when clogged due to contamination.

  Further, when the supply liquid is tap water or well water, there is a concern that the nozzle may be clogged with inorganic salts such as calcium and magnesium contained therein. This is because the injected mist reattaches near the injection port and evaporates, inorganic salts such as calcium are deposited and deposited, and the injection port becomes narrower with time. In order to eliminate this type of clogging concern, a treatment configuration such as ion exchange, distillation, and reverse osmosis is permanently required, and operation energy and maintenance are also required. As a result, the running cost increases.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a two-fluid mist generator capable of generating mist at a low pressure, having a simple nozzle structure and easy maintenance.

  It is another object of the present invention to provide a two-fluid mist generating device that is less likely to cause clogging even without the inorganic salt removal treatment of the liquid used and contributes to a reduction in running cost.

  In order to achieve the above object, a mist generator of the present invention includes a nozzle having a single nozzle hole, a fluid that becomes a gas phase in an environment ejected from the nozzle, and a fluid that becomes a liquid phase in the environment. A fluid supply means for pressure-feeding at least two kinds of fluids; and a mixing section provided between the fluid supply means and the nozzle hole, where the fluid supplied by the fluid supply means joins, The supply pressure of the fluid that becomes the gas phase is set larger than the supply pressure of the fluid that becomes the liquid phase in the environment, and the nozzle hole has a shape extending linearly.

  The flow velocity of the fluid that is in the gas phase in the environment (atmospheric pressure) ejected from the nozzle is faster than the fluid that is in the liquid phase in the same environment, so a shearing force is generated in the nozzle hole and fine droplets containing bubbles are generated. Then, the internal bubbles expand due to a rapid pressure drop after injection, and the fine droplets are divided and further refined (misted). A specific micronization mechanism in the nozzle hole will be described later.

  The nozzle may be configured such that at least the injection port side has a narrow tubular shape.

  PL / PG is 0.3 to 0.6, where PL is the supply pressure of the fluid that is in the liquid phase in the environment ejected from the nozzle, and PG is the supply pressure of the fluid that is the gas phase in the same environment. Also good.

  It is good also as a structure by which the mixing part is provided in the vicinity of the nozzle hole.

  A plurality of nozzles may be provided, and the mixing unit may be provided individually for each nozzle.

  The nozzle may have a material and a shape that cause self-excited vibration by the injection pressure.

  It is good also as a structure which has the container which stores the mist injected from the nozzle.

  It is good also as a structure which has the mist sending means which forcibly sends out the mist stored in the container out of the container.

  It is good also as a structure which can adjust supply_amount | feed_rate of at least one fluid among the fluid which becomes a gaseous phase in the environment injected from a nozzle, and the fluid which becomes a liquid phase in the same environment.

  According to the present invention, there is provided a two-fluid mist generating device that has a simple nozzle structure, is less likely to cause clogging even without liquid filtering or inorganic salt removal, and contributes to lower running costs. Can do.

It is a schematic sectional drawing which shows the experimental structure for demonstrating the principle of this invention. It is an image figure for demonstrating the mechanism in which the fine droplet refined | miniaturized inside the nozzle is further refined | miniaturized. It is a figure which shows the experimental result of the presence or absence of mist generation | occurrence | production by the difference in the pressure ratio of water and air. It is a figure which shows the experimental result about the relationship between a pressure ratio and an air flow rate. It is a schematic diagram which shows the structure of the mist generator which concerns on the 1st Embodiment of this invention. It is a perspective view of a part omitted showing a connection configuration of a mixing part and a nozzle. It is a figure for demonstrating the self-excited vibration of a nozzle. It is a figure for demonstrating the clogging prevention function by the inorganic salt of a thin tube nozzle. It is a perspective view which shows the modification of a nozzle. It is a perspective view which shows the other modification of a nozzle. It is a figure which shows the mist generating apparatus which concerns on 2nd Embodiment, (a) is a figure which shows the mist injection state at the time of being set to mist injection mode, (b) is the water droplet at the time of being set to water droplet injection mode It is a figure which shows an injection state.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the background to the idea of the present invention will be described based on FIGS. 1 to 4 and Table 1. FIG. According to the study by the present inventors, when a mixed fluid of water and air is passed through a single-hole nozzle in a pressurized state, due to the density of water and air, the difference in viscosity, and the friction between the fluid and the nozzle inner wall, A shear force is generated. Due to this shearing force, the mixed fluid is refined to form fine droplets containing bubbles, and when these droplets are ejected from the ejection port to atmospheric pressure, the bubbles expand due to a sudden pressure drop. As a result, fine droplets are divided and further refined. As a result, a good mist state can be obtained even with a low-pressure single-hole nozzle configuration.

  In order to verify the above consideration, an experiment was conducted to examine the relationship between the pressure of water and air, the pressure ratio, and the state of mist generation in a single-hole nozzle configuration. The experimental configuration is schematically shown in FIG. Water W and air A are mixed in the mixing unit 8, and the mixed fluid flows into the nozzle 10 through the flow path joint 50 and is jetted from the jet port 62 d through the small-diameter nozzle hole 62 c that extends straight.

  The above consideration will be described in detail based on the configuration of FIG. 1. In the mixing zone, gas-liquid mixing is performed while water and air collide with the inner wall of the mixing unit 8 at a speed when inflow, and small water containing bubbles is generated. Air bubbles including lumps and small water lumps are mixed at random. In the squeezing / acceleration zone, bubbles mixed in the small water mass, small water mass mixed in the air bubble, etc. are accelerated by the squeezing portion 60b, and are stretched by reducing the cross-sectional area, thereby miniaturizing each. In the refinement zone by shearing, since the inner diameter of the nozzle hole 62c is small, the shearing force due to friction with the inner wall of the nozzle is expressed over almost the entire length of the nozzle hole 62c. In the case of a mixed flow of water and air, the bubbles are refined by shearing force. This occurs because the propagation of frictional force acting from the inner wall differs depending on the density and viscosity of water and air.

  In the sudden pressure reduction / mist injection region, when a fine droplet containing bubbles is ejected in an atmospheric pressure environment, as shown in the image in FIG. It is considered that the droplet Mf that has rapidly expanded and is refined in the nozzle hole 62c is divided into a state that should be called cluster collapse and further refined to become a mist M having a good particle size.

  3 and 4 are plots of the experimental results, and Table 1 shows the numerical values of the experiments regarding the pressure of water and air, the pressure ratio (PW / PA), and the presence or absence of mist generation. 3 and FIG. 4 and the numerical value 1 in Table 1 indicate a good mist generation state in visual sensory evaluation. The non-colored diamonds in FIGS. 3 and 4 and the numerical value 0 in Table 1 do not mean that no mist is generated, and the mist generation state in the sensory evaluation is not desired, that is, the mist has a desired particle size. Means not a level.

  From these results, if the air supply pressure is made larger than the water supply pressure on the upstream side of the nozzle hole 62c and the mixed flow is allowed to flow into the nozzle hole satisfying the predetermined dimensional condition, the simple configuration can be achieved. It can be seen that a good mist state can be obtained even with a hole nozzle. In other words, the above experimental results show that the complexity of the parameters for obtaining a good mist state associated with the complexity of the configuration inside the conventional nozzle can be avoided, and the “hole diameter, This means that an easy approach to mist formation is possible with the simple parameter “length”. Therefore, the specific numerical value of the nozzle hole 62c shown below is only an example.

  A gas-liquid two-phase flow is known to take various flow forms depending on the types of gas and liquid phases, flow channel shape, flow rate, physical properties of both the gas and liquid phases, etc. (Non-Patent Documents) 1). Typical flow forms include a bubble flow, a slug flow, a churn flow, and an annular flow. The bubble flow is a flow in which small bubbles are dispersed in a continuous liquid phase, and is generated mainly when the flow rate of the gas phase is smaller than that of the liquid phase. The slag flow is a flow in which large bubbles (gas slag) that fill the flow path cross section and liquid portions (liquid slag) containing small bubbles exist alternately. The Churn flow is a flow in which the gas slag is long and its interface is pulsating. The annular flow is a flow in which a liquid film is present on the inner wall of the flow channel, and a large number of droplets are accompanied at the center of the cross section of the gas phase flow channel.

  In the apparatus of the present invention, since the air flow rate is large and the diameter of the nozzle hole is small, it is considered that the flow in the nozzle hole 62c is a slag flow or a churn flow. If the liquid containing bubbles flows while adhering to the inner wall, the liquid is hardly crushed. In the apparatus of the present invention, since the air flow rate is large, the flow velocity increases and the relative velocity with the liquid increases. For this reason, the frictional force that air acts on the liquid is large, so that the liquid also receives the frictional force that occurs between the inner wall and the shearing force, and the liquid is peeled off from the inner wall and crushed. .

  Based on FIG. 5 to FIG. 10, the first embodiment of the present invention supported by the above experimental results will be described. The same parts as those shown in FIG. First, based on FIG. 5, the outline | summary of a structure of the mist generator 2 which concerns on this embodiment is demonstrated. The mist generator 2 includes a gas supply unit 4 for supplying air, a liquid supply unit 6 for supplying water, a mixing unit 8 where air and water merge and collide, and a nozzle unit 10 communicating with the mixing unit 8. The mist storage container 12 that accommodates the nozzle unit 10 and the mist delivery means 13 that sends the mist in the mist storage container 12 out of the container are provided. The mixing unit 8 is located upstream of the upstream end of the nozzle hole 62c in the injection direction. Here, air is an example of a fluid that becomes a gas phase in an environment ejected from a nozzle, and water is an example of a fluid that becomes a liquid phase in the environment.

  The gas supply unit 4 includes an air compressor 14 that pumps air, a gas supply path 16 that connects the air compressor 14 and the mixing unit 8, and a pressure gauge 18 that is disposed downstream of the air compressor 14 in the gas supply path 16. And a check valve 20 disposed on the downstream side of the pressure gauge 18, a valve 22 disposed on the downstream side of the check valve 20 and opening and closing the gas supply path 16.

  The liquid supply unit 6 includes a water tank 24 that stores tap water, a liquid supply path 26 that connects the water tank 24 and the mixing unit 8, and a water pump 28 that pumps water in the water tank 24 to the mixing unit 8. The liquid supply path 26 includes a pressure regulating valve 30 disposed on the downstream side of the water pump 28, a pressure gauge 32, and the like. In the liquid supply unit 6, reference numerals 34, 36, and 38 denote valves that open and close the flow path, 40 denotes a water level sensor of the water tank 24, and 42 denotes a drain.

  The mist delivery means 13 is disposed below the nozzle portion 10 in the mist storage container 12 and the gas branch path 44 branched from the gas supply path 16 downstream of the check valve 20. An air nozzle 46 connected to the path 44 and a valve 48 for opening and closing the flow path disposed in the middle of the gas branch path 44 are provided.

  The nozzle unit 10 includes flow path joints 50a, 50b, 50c fixed to the side wall 12a of the mist storage container 12 at intervals in the vertical direction, and nozzles 10a, 10b, 10c attached in communication with these joints. Have. The mixing unit 8 includes mixing units 8a, 8b, and 8c that individually correspond to the nozzles 10a, 10b, and 10c of the nozzle unit 10, respectively. The mixing portions 8a, 8b, and 8c are disposed in the vicinity of the upstream side in the injection direction of the nozzles 10a, 10b, and 10c (strictly, in the vicinity of the upstream side of the upstream end of the nozzle hole in each nozzle). The mixing portions 8a, 8b, and 8c in the present embodiment employ commercially available Y-type union joints and can be connected to the flow path joints 50a, 50b, and 50c with one touch. The gas supply path 16 and the liquid supply path 26 are branched in front of the mixing section 8 corresponding to the number of mixing sections 8a, 8b, and 8c.

  Based on FIG. 6, the connection structure of the mixing part 8 and the nozzle part 10 is demonstrated about the uppermost nozzle 10a. The mixing part 8a has a liquid introduction path 52, a gas introduction path 54, and a joining part (mixing chamber) 56, and a socket (not shown) for connecting to the flow path joint 50a with one touch is attached to the joining part 56. It is done. The flow path joint 50 a has a small-diameter cylindrical nozzle connection portion 58. The nozzle 10a has a cylindrical connecting part 60 that fits into the nozzle connecting part 58 and a fin-shaped vibrating part 62 that self-excites and vibrates with the injection pressure. The connecting part 60 and the vibrating part 62 are capable of self-excited vibration. It is integrally molded with silicon rubber as a unique material. The vibration part 62 has a thick and flat base end part 62a and a taper part 62b which becomes thinner and narrower toward the injection side. Inside the vibration part 62, a small-diameter nozzle hole 62c communicating with the inner hole 60a of the connecting part 60 via the throttle part 60b is formed. The diameter of the nozzle hole 62c is about 1 to 2 mm, and the length HW of the nozzle hole 62c is about 50 mm. The material of the nozzle is not limited to silicon rubber, and may be polyvinyl chloride, polyethylene, polypropylene, polyurethane, or the like. In short, any material capable of self-excited vibration may be used.

  In the merging section 56 of the mixing section 8a, the water W in the liquid introduction path 52 and the air A in the gas introduction path 54 merge, and a mixed fluid in which the water W is pulverized to some extent by the air A is generated. The generated mixed fluid enters the connecting portion 60 of the nozzle 10a, is accelerated by the throttle portion 60b, flows into the nozzle hole 62c, and is jetted from the jet port 62d at the tip thereof. As described above, the mixed fluid becomes a finely pulverized gas-liquid mixed liquid due to a large shearing force caused by friction with the inner wall while passing through the nozzle hole 62c, and the air expands due to rapid decompression when being injected. As a result, the mist M is further refined.

  As described above, after the mixing portion 8 is provided in the vicinity of the upstream side of the nozzle hole in the injection direction to generate the gas-liquid mixed fluid, the mixed fluid is refined by the shearing force through the small-diameter nozzle hole 62c and then injected from the injection port. The configuration. Thereby, favorable mist formation can be obtained with a simple single-hole nozzle configuration. In addition, by adjusting the pressure of water and air, etc., to obtain optimum conditions for mist generation, it is possible to realize good mist formation without complicating the internal configuration of the nozzle.

  As shown in FIG. 3 and FIG. 4, when the water supply pressure is PW (PL) and the air supply pressure is PA (PG), PW / PA (PL / PG) is It was confirmed that mist was generated around 0.5. From FIG. 3, it is desirable that the pressure ratio condition for generating mist is in the range of 0.3 to 0.6. Thus, in the present invention, the optimization condition for mist generation is not determined in the structure inside the nozzle, but is set on the upstream side of the nozzle hole 62c. Thereby, simplification of the structure inside the nozzle is realized.

  As described above, each of the nozzles 10a, 10b, and 10c according to the present embodiment has a material and a shape that can cause self-excited vibration. Based on FIG. 7, the principle of self-excited vibration will be described. As shown in FIG. 7A, when the mist M is injected from the tip of the nozzle 10a, a reaction force Fr based on the kinetic energy of the injection acts on the nozzle 10a as an axial compressive force. The nozzle 10a tries to counter the reaction force Fr with its rigidity, but buckling occurs because of its low material rigidity. As shown in FIG. 6, since the nozzle 10a has a flat shape as a whole, the tip side buckles in a thin direction, that is, a direction perpendicular to the flat surface, and bends (see FIG. 7B). ). When the direction of injection changes due to buckling deformation, the centrifugal force acts in the direction opposite to the buckling deformation direction due to the fluid flowing inside the nozzle 10a, and the elastic restoring force on the material is also added, as shown in FIG. 7 (c). Turn to. This repetition is made in a short cycle and vibrates.

  Self-excited vibration is a vibration phenomenon in which non-vibration input is converted into vibration in the system due to the characteristics of the system even when only non-vibration input is applied to the system. Here, the non-vibration input is the reaction force Fr, and the characteristics of the system itself are the material and shape of the nozzle 10a. The same applies to the other nozzles 10b and 10c.

  The self-excited vibration promotes atomization of the mist M ejected from the nozzles 10a, 10b, and 10c. As described above, since the liquid also receives a frictional force generated between the inner wall of the nozzle holes, a shearing force acts and the liquid is peeled off from the inner wall and pulverized. Here, when the nozzle hole 62c vibrates, there will be a time when acceleration is applied to the liquid in a direction away from the inner wall, and a part of the liquid is easily peeled off from the inner wall. Therefore, it is easier to miniaturize when the nozzle is vibrating than when the nozzle is stationary. For this reason, it has been confirmed that a good mist state can be obtained even when the supply pressure of water and air is as low as about 0.4 MPa.

  Further, in the portion where the width in the radial direction of the nozzle hole is narrow, as shown in FIG. 8, the jet flow of the jetted mist M entrains the surrounding air or the like due to the viscous effect and causes the pull-in flow SF. As the liquid flows toward the tip of the nozzle, the misted liquid re-adheres to the vicinity of the injection port and evaporates, so that inorganic salts such as calcium are not deposited and deposited. Further, since the nozzle vibrates by itself, it is difficult for mist to reattach to the tip of the nozzle. Therefore, there is no possibility that the inorganic salts contained in the mist are deposited and clogged near the nozzle outlet.

  As shown in FIG. 5, the mist M injected from the nozzles 10a, 10b, and 10c is stored in the mist storage container 12, and then sent from the upper part toward the use area as necessary. In this type of mist generating device, there is a time lag until the set pressure of each fluid reaches the mist generating condition and stabilizes at the beginning of mist blowing, and it is inevitable that large droplets or dripping occur during this time. Even at the end of blowing, until the flow of the fluid stops, it becomes a condition out of the mist condition, and there is a possibility that a large droplet or dripping may occur. This occurrence is prevented and only the mist M is supplied to the necessary place. Therefore, the mist storage container 12 of this embodiment has the structure by which the bottom face was obstruct | occluded. Large droplets, dripping, or water droplets generated by the growth of mist attached to the side of the container are accumulated at the bottom of the mist storage container 12. That is, it is possible to supply only a high-quality mist that is not mixed with water droplets having a large particle diameter to a necessary area. The accumulated water is returned to the water tank 24 through a flow path (not shown) and is reused.

  The mist stored in the mist storage container 12 naturally flows out of the container when the pressure in the container increases, but in the present embodiment, the mist can be forcibly and appropriately sent out of the container by the mist sending means 13. It has become. That is, when air is ejected from the air nozzle 46 below the nozzle portion 10, the mist M accumulated in the mist storage container 12 is pushed up and forcibly sent out of the container. By controlling the mist sending means 13 by a controller (not shown), the mist M can be sent intermittently or periodically. The mist delivery direction can be changed, for example, by changing the direction of the lid 12b of the mist storage container 12. In this embodiment, the number of nozzles is three, but the present invention is not limited to this.

  As shown in FIG. 9, instead of the nozzles 10a, 10b, and 10c shown in FIG. 6 and the like, a vibrating portion 64 having a nozzle hole 64a may be a nozzle 10d having a conical taper shape with a fin portion cut. In this case, since the rigidity is lower than that with fins, self-excited vibration occurs even at a lower pressure, and a further lower pressure can be realized. As shown in FIG. 10, it is good also as the nozzle 10e which has the tube 66 with a fixed diameter at the front-end | tip part of the nozzles 10a, 10b, 10c. In this way, the vibration due to the deformation of the tube 66 has a long cycle, and it can be used as an artificial rainfall nozzle that ejects water droplets. The inner hole 66a of the tube 66 is an extension hole of the nozzle hole 62c. In these thin tubular nozzles, the above-described drawing flow acts on the entire peripheral surface, so that the function of preventing clogging due to precipitation and deposition of the inorganic salts is improved.

  FIG. 11 shows a second embodiment. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description on the structure and function already described will be omitted as appropriate.

  The mist generating device 70 according to the present embodiment has a mist injection mode in which water and air are supplied to generate mist, and a liquid droplet injection mode in which only water is supplied to generate water droplets. It is possible. The mist generating device 70 includes two support columns 72 a and 72 b, a horizontal member 74 that connects them, a nozzle support member 75 fixed to the horizontal member 74, and the like. The nozzle support member 75 supports the mixing unit 8 and the flow path joint 50 and nozzles 10e1, 10e2, 10e3, and 10e4 that are communicated with these joints and attached downward. The air supply configuration and the water supply configuration are the same as those in the first embodiment. In the present embodiment, the mist sending means 13 is not provided because of the open configuration outdoors.

  Fig.11 (a) has shown the state set to the mist injection mode. The mixed flow generated by the mixing unit 8 passes through the nozzle holes 62c of the nozzles 10e1, 10e2, 10e3, and 10e4, and further facilitates atomization by self-excited vibration, and is sprayed downward from the tip of each nozzle. When the droplet ejection mode is set, as shown in FIG. 11B, the valve 22 arranged in the gas supply path 16 is closed, and no air is supplied. Since there is no merging with air, atomization (misting) is not performed, and water droplets (raindrops) are ejected from each nozzle 10e1, 10e2, 10e3, 10e4. The nozzle for the droplet ejection mode is not limited to the nozzle 10e, and may be nozzles 10a to 10c and 10d.

  The opening / closing amount of the valve 22 arranged in the gas supply path 16 and / or the valve 38 arranged in the liquid supply path 26 or the supply pressure of the air compressor 14 and / or the water pump 28 is adjusted, and the droplets to be ejected are controlled. You may make it change a particle size in steps between mist and a raindrop. This droplet variable ejection mode can serve both as the mist ejection mode and the droplet ejection mode. When implementing at least one of these modes, the valves 22 and 38 may be electromagnetic valves, and may be automatically performed by a control means (not shown) based on input information to an operation panel (not shown). .

  In each of the above embodiments, the fluid that becomes a gas phase in the environment ejected from the nozzle is exemplified as air, and the fluid that becomes the liquid phase in the environment is exemplified as water. However, the present invention is not limited to this. The fluid that becomes a gas phase in the environment ejected from the nozzle may be in the liquid phase inside the nozzle. Moreover, the structure which refines | miniaturizes the mixed flow of 3 or more types of fluids may be sufficient.

  In each of the above embodiments, the nozzle has been described as an example having a material and shape capable of self-excited vibration. However, the present invention can also be implemented with a rigid nozzle that does not self-excited.

  In each of the above embodiments, the nozzle and the mixing unit are illustrated as separate members, but the nozzle and the mixing unit may be integrally formed.

  All the embodiments described above are illustrative of the present invention and are not intended to be limiting, and the present invention can be implemented in other various modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

DESCRIPTION OF SYMBOLS 2,70 Mist generator 4 Gas supply part as fluid supply means 6 Liquid supply part as fluid supply means 8 Mixing part 10a, 10b, 10c, 10d, 10e Nozzle 12 Mist storage container as container 13 Mist delivery means A nozzle Air as a fluid that becomes a gas phase in an environment ejected from the water M Mist W Water as a fluid that becomes a liquid phase in an environment ejected from the nozzle

Claims (9)

A nozzle having a single nozzle hole;
Fluid supply means for pressure-feeding at least two kinds of fluids, ie, a fluid in a gas phase in an environment ejected from the nozzle and a fluid in a liquid phase in the environment;
A mixing unit provided between the fluid supply unit and the nozzle hole, and the fluid supplied by the fluid supply unit merges;
With
The supply pressure of the fluid that becomes a gas phase in the environment is set larger than the supply pressure of the fluid that becomes a liquid phase in the environment, and the nozzle hole has a shape extending linearly ,
The mixing unit includes a gas introduction path for supplying a fluid that is in a gas phase in the environment;
A liquid introduction path for supplying a fluid in a liquid phase in the environment;
It is connected only to the flow path joint through which the mixed fluid merged in the mixing section flows,
The mist generating apparatus according to claim 1, wherein all of a fluid in a gas phase in the environment and a fluid in a liquid phase in the environment are supplied to the nozzle hole as the mixed fluid via the flow path joint .   The gas introduction path and the liquid introduction path are oriented in substantially the same direction as the nozzle hole,
  The mist generating apparatus according to claim 1, wherein the mist generating apparatus is a mixed fluid that substantially maintains a flow rate of a fluid that becomes a gas phase in the environment and a fluid that becomes a liquid phase in the environment. The nozzle is to at least the injection port side the name of the canalicular,
A mist generating device according to claim 1 or 2, characterized in that it has a material and shape which causes a self-excited oscillation at injection pressure. PL / PG is 0.3 to 0.6, where PL is a supply pressure of a fluid that is a liquid phase in the environment, and PG is a supply pressure of a fluid that is a gas phase in the environment. Item 4. The mist generator according to any one of Items 1 to 3 . The mist generator according to any one of claims 1 to 4 , wherein the mixing portion is provided in the vicinity of the nozzle hole. The nozzle provided with a plurality of mist generating device according to any one of claims 1 to 5, wherein the mixing unit is characterized in that are provided individually with respect to each nozzle. The mist generator according to any one of claims 1 to 6 , further comprising a container for storing mist ejected from the nozzle. The mist generating apparatus according to claim 7 , further comprising mist sending means for forcibly sending the mist stored in the container to the outside of the container. The mist generating apparatus according to claim 7 , wherein a supply amount of at least one of a fluid that is in a gas phase in the environment and a fluid that is in a liquid phase in the environment can be adjusted.

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