JP2012223688A - Method and device for spraying dry mist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve instability of spray operation accompanying downsizing/simplifying a dry mist spray device using a two-fluid nozzle, and to facilitate handling/operating of the device.SOLUTION: The dry mist spray device 1 includes a compressor 2, a liquid container 3, the two-fluid nozzle 4, a nozzle gas tube 6 diverging from the compressor and communicating to the two-fluid nozzle, a gas tube 7 for a container, and a liquid tube 9. Duct resistance of the gas tube is set corresponding to height during use from a liquid surface of the liquid container to the two-fluid nozzle. High-pressure air from an air compressor is used in common for supplying liquid and gas to the nozzle so as to simplify the device, which makes easy the operation of the liquid tube and a detaching part of the liquid container with the liquid tube inserted as well as prevents instability of spraying operation of the nozzle caused by increase of distance between the nozzle and the liquid surface.

Description

  The present invention relates to a dry mist spraying method and apparatus using a two-fluid nozzle.

  2. Description of the Related Art A two-fluid nozzle that mixes liquid and gas and discharges them as mist droplets can generate fine mist droplets at a low pressure and has been conventionally used in various fields such as humidity control and cleaning (Japanese Patent Laid-Open No. 2005-46338). : Patent Document 1), it has become increasingly popular in recent years to efficiently control the temperature / humidity by generating so-called dry mist that does not wet the surroundings by spraying the fine droplets obtained thereby. Application in showrooms is also being attempted.

  Various types of two-fluid nozzles are known, but the water supplied under pressure is formed as a liquid film inside the nozzle, and the air introduced under pressure acts as a swirling flow on the liquid film. The two-fluid nozzle configured to generate fine dry mist by applying a shearing force operates at an extremely low pressure, and can effectively generate nano-order dry mist. The present inventor has proposed and developed a spraying device used for inactivation of influenza virus in a hospital room or the like using such a two-fluid nozzle (Japanese Patent Laid-Open No. 2011-52900).

According to the above type of nozzle, dry mist can be generated effectively by supplying low-pressure pressurized air and a small flow rate of water. For example, the humidity of a normal living space of about 300 m ³ can be controlled to a predetermined humidity in a short time. The air compressor used for this purpose is a small and low-pressure compressor with an output of about 50 KPa or less. The weight and volume of the entire spray system are remarkably small, there is almost no noise generation, and the power consumption is about 30 W, which is remarkable. Energy saving effect is expected.

  Such a small dry mist spraying device can also be applied to personal use such as beauty care and health care such as skin care and inhalers. For these purposes, the entire system is further miniaturized and handled. Is required. For example, in order to make the device movable, a single compressor is commonly used as a power source for water and pressurized air supplied to the nozzle, and the liquid in the water tank is partly due to the pressure via a pressurized air line. It is known in part to pressurize the surface and supply liquid to the nozzle. Also, in such a system, if the water tank is a detachable can or bottle with a small capacity, various types of liquid containers can be exchanged at any time according to the application, and can be used as a multipurpose device. it can.

JP 2005-46338 A JP2011-52900A

  However, in such a case, since air and liquid are supplied simultaneously using a common compressor, the balance of pressure distribution between them tends to be lost, and the spraying operation tends to become unstable. In addition, since a gas tube for pressurization and a liquid tube for supplying water to the nozzle by pressurization are connected to the liquid container, respectively, it is difficult to detach the container by ordinary screwing. In order to solve these problems, some kind of mechanism is required, but no specific means has been known so far.

In the present invention,
A compressor for supplying high-pressure gas;
A liquid container for storing liquid;
A spiral dry mist is generated by applying a shearing force by a pressurized gas as a swirling flow shape to the liquid film formed by the liquid supplied to the nozzle and positioned above the liquid surface of the liquid container. A two-fluid nozzle;
One side is connected to the compressor, the other side is branched by a branch portion, and one branch pipe forms a nozzle gas pipe that leads to the two-fluid nozzle, and the other branch pipe leads to the liquid level in the liquid container. A gas pipe constituting the gas pipe;
A liquid pipe with one end facing the liquid in the liquid container and the other end leading to a two-fluid nozzle;
Using a spraying device having
The liquid in the liquid container is pressure-fed to the two-fluid nozzle through the liquid pipe by pressurization with gas supplied from the container gas pipe.

  In the above-described configuration, the compressed air from the compressor is branched by the branch portion, and is supplied to the two-fluid nozzle through the nozzle gas pipe which is one of the branch pipes to form a swirling flow therein. The other branch pipe communicates with the liquid container from the branch section, and pressurizes the water surface of the liquid stored in the liquid container. As a result, the liquid is raised under pressure through a liquid tube having one end facing the liquid in the container and supplied to the nozzle.

  As a result, it is possible to omit a motor or the like conventionally used for pumping liquid from a tank as a liquid container, and the overall apparatus configuration becomes compact. In addition, when water is supplied using the tap water pressure, a long pipe from the tap to the spray system is required, so the installation location is restricted, but the present invention has a built-in liquid container. The dry mist spraying device can be provided at any place.

  Furthermore, in the present invention, the container gas pipe and the liquid pipe are connected and fixed to the liquid container via a connection lid that is detachably attached to the neck of the liquid container.

  Thus, the gas pipe to the liquid container and the liquid pipe from the liquid container are arranged together inside the liquid container via the connection lid. Since the connection lid is detachable from the liquid container, the container gas pipe and the liquid pipe can be quickly removed from the liquid container when the liquid is supplied from the neck.

  Also, in a preferred aspect of the present invention, the connection lid includes an inner lid that is attached to the container gas tube and the liquid tube and is attached to and detached from the neck portion in the axial direction, and a threaded engagement with the outer periphery of the neck portion. It consists of an outer lid that airtightly presses the inner lid to the tip of the neck.

  When replacing the liquid container, the connection lid with the gas pipe / liquid pipe inserted is usually rotated by screwing into the liquid container. However, in this structure, the two pipes are moved along with the rotation of the connection lid. Since a twisting reaction force is generated, the operation cannot be performed smoothly. In the present invention, for example, when the connection lid is removed, the screw on the outer lid is loosened and the inner lid is moved in the axial direction in this state, so that the connection lid can be connected to the neck of the liquid container without twisting the gas pipe and the liquid pipe. It can be easily removed from the part.

  Moreover, in another aspect of the present invention, the connection lid is formed with a female screw on the inner periphery, and is non-rotatably fitted to the casing of the spraying device on the outer periphery, and the liquid container has a neck portion of the connection cover. It is made detachable by screw engagement with the female screw.

  Accordingly, when the liquid container is rotated when the connection lid is removed, the screw engagement with the connection lid is released, and the liquid container can be easily removed. Since the container gas pipe and the liquid pipe are attached to a connection lid that is non-rotatably fitted to the casing of the spraying device, the container gas pipe and the liquid pipe are not twisted by the operation at the time of attachment / detachment.

  Furthermore, in the present invention, the pipe line resistance of the gas pipe is adjusted / set in accordance with the height in use from the liquid level of the liquid container to the two-fluid nozzle. In the present invention, the pressurized gas from the compressor is branched into the pressurized gas for spraying the nozzle and the pressurized gas for pumping the liquid in the container to the nozzle, and a desired dry mist spray can be obtained. The compressor output, the pipe length and pipe diameter of each piping system, the shape and volume of the liquid container, the height from the liquid level in the container to the nozzle, etc. are set in advance, thereby the liquid and pressurized gas to the nozzle Supply amount is determined.

  Here, the height from the liquid level to the nozzle changes due to, for example, a decrease in the liquid level accompanying spraying, movement of the nozzle operation position, change of the container installation position, and the like. When this height is higher than the set position, the pressure on the container liquid tube for raising the liquid in the container against the atmospheric pressure is insufficient, and the balance between the liquid amount and the gas amount is lost and the spraying operation is not performed. When the position becomes gradually unstable and beyond a certain position, the supply of the liquid is interrupted and the desired dry mist spraying is substantially stopped.

In the present invention, the pipe line resistance of the nozzle gas pipe is adjusted and set according to the height in use from the liquid level to the nozzle. When an increase in height is predicted, for example, depending on the use conditions of each device, the pressure of the pressurized air on the nozzle gas pipe side from the compressor is increased by correspondingly increasing the pipe line resistance of the gas pipe. The decrease in the pressure due to the liquid supply due to the increase in the height is relatively compensated and the spray of the dry mist is stabilized.
According to experiments in which various means can be considered for adjusting (increasing) the pipe resistance, the increase in pipe length and the increase in air resistance (thereby reducing the pressure) are roughly proportional to each other's operating conditions. If the maximum fluctuation value of the height is predicted based on this, the tube length that should correspond to it can be set easily. Further, since the pipe resistance increases as the pipe diameter decreases, a means for increasing the pipe resistance by reducing the pipe diameter is also effective in a specific case. Further, the height is increased by adjusting the distance from the compressor outlet of the branch portion of the gas pipe and increasing the pressure of the gas pipe for the container to relatively increase the difference between the water pressure and the gas pressure at the nozzle section. Can also be supported.

It is a block diagram of the configuration of the dry mist spraying apparatus according to the present invention. It is sectional drawing of one Example of a connection lid | cover. It is sectional drawing of the other Example of a connection lid | cover. It is an external view of a liquid container, (a), (b), (c) is a top view, a front view, and a side view, respectively. It is a block diagram of an air cleaning apparatus. It is explanatory drawing of an example of a two-fluid nozzle. It is a graph which shows the relationship of the pipe length corresponding to the height from a liquid level to a nozzle. It is a graph which shows the branch position of the gas pipe for containers, and the relationship of a pressure.

  The dry mist spraying apparatus of the present invention can be applied to various purposes such as skin care for skin in beauty salons and homes, beauty / health use such as massage and inhalation, and use for air purification.

  In FIG. 1, a dry mist spraying apparatus 1 according to the present invention includes a compressor 2 that supplies pressurized gas, a liquid container 3 that stores liquid, a liquid container 3 that is located above the liquid level, and is applied to the inside of the nozzle. A two-fluid nozzle 4 for generating a spiral dry mist by applying a shearing force to a liquid film formed by a liquid supplied under pressure by a gas as a swirling flow shape; The end side is branched by the branching portion 5, one of the branch pipes forms a nozzle gas pipe 6 that communicates with the two-fluid nozzle 4, and the other branch pipe forms a container gas pipe 7 that communicates with the liquid container 3. A gas pipe 8 and a liquid pipe 9 with one end facing the bottom of the liquid container 3 and the other end communicating with the two-fluid nozzle 4 are provided. The gas is generally air, and as the liquid, for example, water, various chemical solutions for moisturizing, deodorizing, cosmetics, and sterilization are used.

  In the dry mist spraying device 1 for beauty / health use in a beauty salon or home, a compressor 2 having an output rating of about 50 kPa or less is sufficient, and the outer shape is, for example, a small size of about 15 cm square and 20 cm long. Things are commercially available.

  The two-fluid nozzle 4 may be any one that generates a spiral dry mist by applying a shearing force by a gas as a swirling flow shape to a liquid film formed by a liquid supplied under pressure inside the nozzle. Although not particularly limited, the two-fluid nozzle 4 shown in FIG. 6 can be preferably used. 6A is a cross-sectional view showing an outline of the two-fluid nozzle, FIG. 6B is an explanatory diagram of the first air current swirling unit, and FIG. 6C is an explanatory diagram of the second air current swirling unit.

The two-fluid nozzle 4 includes a liquid supply device 42, a gas supply device 43, a liquid film forming wall 44, a first airflow swirling portion 45 that swirls part of the supplied gas, and a second airflow swirling portion that swirls the remaining gas. 46 and a cylindrical outer cylinder 47. As shown in FIG. 6 (a), the liquid film forming wall 44 is erected in an annular shape so as to gradually decrease in diameter toward the injection port 48, and the circular opening edge 44b is formed at the tip, and the inner peripheral wall surface 44a serves as a liquid film formation site. A plurality of liquid injection holes 42 b are formed through the liquid supply device 42 along the circumferential direction so as to face the first airflow swirl unit 45. The end wall 42 a of the liquid supply device 42 becomes a conical projecting central body 42 c and extends in the axial direction to the vicinity of the circular opening edge 44 b of the liquid film forming wall 44.
The first airflow swirl 45 has a wall 45b that is formed in an annular shape from the end wall 42a of the liquid supply device 42 and abuts against the base 44c of the liquid film forming wall 44. As shown in FIG. 6 (b), a plurality of groove-shaped channels 45 a that communicate with the channel 43 a of the gas supply unit 43 and turn the first airflow are formed by a radial flow method. The second airflow swirl 46 has a wall 46b that is formed in an annular shape from the outer peripheral edge of the base 44c of the liquid film forming wall 44 and abuts against the end wall 47a of the outer cylinder 47. As shown in FIG. 6C, a plurality of groove-shaped flow paths 46a for turning the second air flow are formed by communicating with the flow path 43a of the gas supply device 43, as shown in FIG. 6C.
A circular opening is formed in the end wall 47 a of the outer cylinder 47, and an annular injection port 49 is formed so as to be concentric with the injection port 48 formed by the circular opening edge 44 b of the liquid film forming wall 44. Is done.

  The configuration of the two-fluid nozzle 4 is as described above, and the liquid is ejected from the liquid ejection hole 42b of the liquid supply device 42, adheres to the inner peripheral wall surface 44a of the liquid film forming wall 44, and is formed as a liquid film. On the other hand, a part of the gas flows from the flow path 43a of the gas supply device 43 into each flow path 45a of the first air flow swirl unit 45, thereby generating a first swirl air flow inside the liquid film forming wall 44, By this first swirling airflow, a shearing force acts on the liquid film to atomize the liquid, and droplets are discharged from the circular opening edge 44 b of the liquid film forming wall 44. Further, the remaining gas flows into each flow path 46 a of the second airflow swirl unit 46, so that a second swirl airflow is generated outside the liquid film forming wall 44. Further shearing force is applied by the second swirling air current, and the liquid particles are further atomized.

  A gas pipe 8 and a liquid pipe 9 and a connection lid 10 for connecting and fixing the gas pipe 8 and the liquid pipe 9 to the liquid container 3 will be described with reference to FIGS. A compressor connection gas pipe 11 constituting one end side of the gas pipe 7 is attached to the air supply port of the compressor 2, and a trifurcated connector 12 as a branch portion 5 is attached to the downstream end of the compressor connection gas pipe 11. One end of the nozzle gas pipe 6 is attached to one of the remaining two connection ports of the three-way connector 12, and one end of the container gas pipe 7 is attached to the other connection port. As the gas pipe 8 and the liquid pipe 9, a synthetic resin pipe, a rubber pipe or the like is preferable.

  Referring to FIG. 2, the container gas pipe 7 and the liquid pipe 9 are connected and fixed to the liquid container 3 via a connection lid 10 that is detachably attached to the neck 13 of the liquid container 3. The connection lid 10 includes an inner lid 14 to which the container gas tube 7 and the liquid tube 9 are attached and attached to and detached from the neck portion 13 in the axial direction, and a threaded engagement with the outer periphery of the neck portion 13 to attach the inner lid 14 to the neck portion 13. And an outer lid 15 that is in airtight contact with the tip of the outer lid.

  The inner lid 14 has a shape having an insertion portion 14A to be inserted into the opening of the neck portion 13 and a flange portion 14B which is formed on the upper portion of the insertion portion 14A so as to have the same diameter as the tip diameter of the neck portion 13. , A screw hole 14C penetrating vertically is formed at the center. The inner lid 14 is made of, for example, an aluminum alloy. A ring-shaped sealing material 16 made of Teflon (registered trademark) or the like is attached to the lower surface side of the flange portion 14B.

  A connection port of the three-way connector 17 is attached to the upper surface side of the inner lid 14 so as to be screw-engaged with the screw hole 14C, and one of the remaining two connection ports of the three-way connector 17 facing the upper side is connected. The other end of the container gas pipe 7 is attached. A stopper portion 18 is provided in an annular shape on the inner wall of the connection port of the three-way connector 17, and the other end of the container gas pipe 7 is inserted into and fixed to the connection port of the three-way connector 17 until it abuts against the stopper portion 18. The A sealing member 19 is appropriately interposed between the periphery of the other end of the container gas pipe 7 and the inner wall of the connection port of the trifurcated connector 17.

  On the other hand, the liquid pipe 9 includes a first liquid pipe 9A and a second liquid pipe 9B. The first liquid pipe 9 </ b> A is piped between the trifurcated connector 17 and the two-fluid nozzle 4, and one end of the first liquid pipe 9 </ b> A is inserted and fixed until it hits the stopper 18 at the remaining connection port of the trifurcated connector 17. A sealing member 19 is appropriately interposed between one end of the first liquid pipe 9 </ b> A and the inner wall of the connection port of the trifurcated connector 17. One end of the second liquid pipe 9B is a thin tube inserted and fixed inside one end of the first liquid pipe 9A, and the other end faces the bottom of the liquid container 3 through the inside of the three-way connector 17. Even if a slight gap is formed at the connection between the first liquid pipe 9A and the second liquid pipe 9B, the surface tension of the water when it is being pumped is large, so water does not leak from the gap. .

  The outer lid 15 is extended downward from the periphery of the canopy 15A with a relief hole 15C through which the trifurcated connector 17 is passed, and is engaged with a male screw on the outer periphery of the neck 13. It has a shape having a cylindrical knob portion 15B in which a female screw 15D is formed. When the outer lid 15 is put on the neck portion 13 and screwed and tightened, the canopy portion 15A of the outer lid 15 presses the flange portion 14B of the inner lid 14, and the space between the sealing material 16 and the tip of the neck portion 13 is airtight. become. The outer lid 15 is also made of, for example, an aluminum alloy. Note that the outer periphery of the knob portion 15B is knurled to prevent slipping.

As described above, the gas pipe 8 that supplies gas to the liquid container 3, specifically, the gas pipe 7 for container and the liquid pipe 9 that supplies liquid from the liquid container 3 are collected together in the liquid container 3 through the connection lid 10. Connection is fixed. When injecting and replenishing liquid from the neck 13 to the liquid container 3 that has used up the liquid by the nozzle spraying operation by the compressor 2, the knob 15B of the outer lid 15 is turned to loosen the screw and remove it from the neck 13. Thus, the inner lid 14 is moved in the axial direction of the neck 13, that is, simply lifted upward without rotation. Thereby, the connection lid 10 can be easily removed from the liquid container 3.
When trying to remove the screw-type connection lid with the gas / liquid pipe attached from the liquid container 3, in the normal case, twisting reaction forces are generated in the two pipes along with the rotation of the connection lid, thereby smoothing the operation. Although there is a possibility that it cannot be performed, by using the structure in which the inner lid 14 is moved in the axial direction of the neck portion 13, the neck is formed without causing twisting of the rotation of the gas tube 7 for the container and the liquid tube 9. The liquid can be smoothly replenished by removing it from the portion 13.

  FIG. 3 shows another embodiment of the connection lid. The connection lid 30 shown in FIG. 3 has a female screw 30 </ b> D formed on the inner periphery, and is non-rotatably fitted to the casing 31 of the spraying device on the outer periphery. The connection lid 30 includes a canopy 30A formed in the center with a screw hole 30C that engages with the connection port of the trifurcated connector 17, and extends downward from the periphery of the canopy 30A. It has a shape having a cylindrical body portion 30B in which the female screw 30D engaged with the screw is formed. The manner in which the container gas pipe 7 and the liquid pipe 9 are attached to the trifurcated connector 17 is the same as in FIG.

  The casing 31 is a housing that houses the liquid container 3, the compressor 2, and the like, for example, and FIG. 3 locally shows a horizontal plate portion that constitutes a part of the casing 31. For example, a hexagonal counterbore 32 is formed on the lower surface side of the plate portion of the casing 31. The outer periphery of the connection lid 30 is formed in a hexagonal shape corresponding to the counterbore hole 32, and the connection lid 30 is fitted into the counterbore hole 32 by press-fitting or the like, and is fitted and fixed to the casing 31 so as not to rotate. . A ring-shaped sealing material 33 made of Teflon or the like is attached to the lower surface side of the canopy 30A. When the liquid container 3 is attached, the sealing material 33 brings the bottom surface of the canopy 30A and the tip of the neck 13 into an airtight state. Above the counterbore 32, a relief hole 34 for passing the trifurcated connector 17 is formed.

  The liquid container 3 is configured such that the neck portion 13 is detachable by screw engagement with the female screw 30 </ b> D of the connection lid 30. Since the present embodiment has a structure in which the liquid container 3 is rotated and detached with respect to the fixed connection lid 30, a small container is suitable as the liquid container 3, and a general-purpose aluminum can, a plastic bottle, or the like is used. Is done. When the volume of the container is as small as 0.1 to 2 L, when used at a liquid volume of about 10 cc per minute, the contents will be used up in 10 minutes to 3 hours. It can be used in a state of little change over time.

  As described above, when the liquid is injected and supplied from the neck 13 to the liquid container 3 that has used up the liquid by the nozzle spraying operation by the compressor 2, the liquid container 3 is simply removed by simply rotating the liquid container 3. Can do. When the liquid container 3 is attached or detached, the container gas tube 7 and the liquid tube 9 remain attached to the connection lid 30 fixed to the casing 31, and the container gas tube 7 and the liquid tube 9 are twisted in rotation. Does not occur.

  As the liquid container 3, a three-axis elliptic container having an elliptical shape when viewed from the three-axis direction as shown in FIG. 4 can be suitably used in consideration of pressure resistance. In this case, the liquid container 3 is preferably made of, for example, a synthetic resin. A transport handle 20 is provided on the upper portion of the liquid container 3. Further, the neck portion 13 is formed on the upper portion of the liquid container 3.

  As shown in FIG. 1, an air cleaning device 21 is appropriately interposed in the middle of the nozzle supply gas pipe 6. As shown in FIG. 5, the air cleaning device 21 immerses an air stone 22 made of a porous ceramic material or the like connected to the nozzle gas pipe 6 in the tank 23, and passes the gas foamed from the air stone 22 to the liquid. It consists of a structure to be washed. As the liquid, in addition to water, a bactericidal agent such as chlorine dioxide or electrolyzed water may be used, so that the cleaned air can be supplied to the two-fluid nozzle 4.

  The dry mist spraying apparatus according to the present invention includes the output of the compressor 2, the height from the liquid level of the liquid container 3 to the two-fluid nozzle 4, the length of each pipe such as the nozzle gas pipe 6, the container gas pipe 7, and the liquid pipe 9. In addition, it is designed and manufactured by setting the pipe diameter and the like to predetermined values so as to obtain an optimum supply amount of gas (air) and liquid (water) to the two-fluid nozzle. As an example, for example, the output of the compressor outlet is 40 KPa, the length of the nozzle gas supply pipe 6 is 3.0 m, the diameters of the nozzle gas pipe and the container gas pipe are 6 mm, respectively, at a predetermined distance from the compressor outlet. When the container gas pipe 7 is branched and connected to the liquid container, the standard height from the liquid level to the nozzle at the time of full water is set to 50 cm, and it is stabilized by supplying water of 10 cc / min and air of 10 L / min. Mist spraying can be performed.

  Here, the standard height 50 cm from the liquid level to the nozzle when full of water is an average value set in consideration of actual use conditions when manufacturing the apparatus of the present invention, and this value is an actual value. Individual devices vary depending on the specific use conditions. For example, the height between the liquid level and the nozzle when the liquid level when the liquid container is full decreases due to the spraying operation of the nozzle, or when the position of the nozzle relative to the liquid level increases due to a change in the nozzle operation position. Will increase. In these cases, the height of the liquid column that rises against the atmospheric pressure in the liquid pipe increases, so the pressure to push up the water is insufficient, and the balance of the water and air supply amount is lost and the spray is unstable. become. When the height distance between the liquid level and the nozzle increases, for example, from 50 cm to 40 cm to 90 cm, the supply of the liquid to the nozzle is interrupted, and spraying as a dry mist state from the nozzle is substantially not performed.

  As a countermeasure in such a case, as the height from the liquid level to the nozzle increases, the output of the compressor itself is controlled to increase or the pressure to the water piping system is increased on the premise that the flow rate control device is used. However, the specific means for doing so is not known, and it is not possible for the device user to deal with each case and to perform such control, and the individual device is used. This is an extremely complicated and difficult measure for the worker who installs the machine in the place.

  In the experimental stage of the specific spraying apparatus of the present invention, if the tube length of the nozzle gas pipe is set to be longer than a predetermined value, the nozzle from the nozzle is increased even if the height from the water surface to the nozzle increases to 90 cm. There was a tendency that the spray of mist was continuously obtained stably. For example, as shown in FIG. 7, when the pipe length of the nozzle gas pipe was further increased by 1.5 m from the initial set value of 3.0 m, the spraying was always continued stably. This is because the pipe resistance increases as the length of the gas pipe for the nozzle increases, and the pressure of the compressed air from the compressor decreases due to the pipe resistance, and the pressure difference at the nozzle (water pressure – gas pressure) It is thought that the pressure difference is small and the relative water pressure is small, so that the conventional problem that water was pushed back from the nozzle has been solved and water has reached the nozzle. .

  According to experiments conducted on the spraying device to confirm the relationship between an increase in pipe resistance (air resistance) and an increase in air resistance (decrease in air pressure on the nozzle side) when increasing the pipe length, It has been found that the increase in pipe resistance is in a substantially linear proportional relationship. Therefore, the tube length value required to adjust the relative pressure difference between water pressure and air pressure at the nozzle section based on the maximum expected height between the liquid level and the nozzle for a particular spray device is easy Can be set to

  The maximum height is about 1 m in view of the actual nozzle operation and the liquid level drop state in view of the general use state of the dry mist spraying device for the purpose of the present invention. Considering the increase, it is sufficient for practical use.

  As a means for increasing the pipe resistance, it is generally considered that the pipe cross-sectional area (tube diameter) is reduced. However, according to the experimental results actually measured for the specific spray device, when the outer diameter of the nozzle supply gas pipe is 8 mm, 6 mm, and 4 mm, the air resistance is 1 → 2.1 times → 24.8. Since the change in air resistance with respect to a slight diameter difference is extremely abrupt and is not in a simple proportional relationship, adjusting the pipe resistance, that is, the decrease in air pressure on the nozzle side by changing the pipe diameter depends on the pipe length. Difficult to adjust. However, if there is a possibility that the pipe length will be remarkably increased during the adjustment by the pipe length, adjustment by reducing the pipe diameter or by combining this with the increase in the pipe length is also effective.

  Next, a method for controlling the relative water pressure of the nozzle portion as another means for adjusting the pipe resistance will be described with reference to FIG. FIG. 8 shows the air pressure of the container gas pipe at the nozzle branch when the length of the gas pipe is fixed at 2.6 m. The horizontal axis indicates the branch position of the container gas pipe 7 provided in the middle of 2.6 m of the total length of the gas pipe as a ratio (ratio to 2.6 m), and the vertical axis indicates the container side gas measured at each branch position. Indicates the pressure on the tube.

  As shown by the lower straight line in FIG. 8, the air pressure on the nozzle side of the nozzle gas is constant at 24 kPa. On the other hand, as shown by the upper curve, the air pressure of the container side gas pipe has a branch point at the above-mentioned ratio. It increases almost linearly from the position set as 1 (branch position = nozzle part) to the position where the ratio is 0 (branch position = compressor outlet). In the container gas pipe 7 after the branch portion, the air flow flowing therethrough is as small as the amount of water injected into the nozzle (for example, 10 cc / min), that is, the amount of air in the nozzle air pipe (for example, 10 L / min). The air pressure loss there is extremely small. Accordingly, the water pressure in the tank portion is almost the same as the air pressure in this branch portion. Therefore, by adjusting the branch position, the water pressure can be adjusted, an appropriate water pressure corresponding to the height of the nozzle and the water surface can be given, and stable spraying is possible.

  As described above, when the water pressure is reduced, it is no longer possible to spray from the nozzle. Actually, as the water pressure decreases, the amount of spray sprayed from the nozzle, in other words, the amount of water gradually decreases and eventually becomes zero, and spraying stops.However, by appropriately selecting the position of the branch point, additional It is possible to adjust the water pressure without using parts, thereby adjusting the spray amount appropriately.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to those described in the drawings, and various design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Dry mist spraying apparatus 2 Compressor 3 Liquid container 4 Two-fluid nozzle 5 Branch part 6 Nozzle gas pipe 7 Container gas supply pipe 8 Gas pipe 9 Liquid pipe 10, 30 Connection lid 13 Neck part 14 Inner lid 15 Outer lid

Claims (12)

A compressor for supplying high-pressure gas;
A liquid container for storing liquid;
A spiral dry mist is generated by applying a shearing force by a pressurized gas as a swirling flow shape to the liquid film formed by the liquid supplied to the nozzle and positioned above the liquid surface of the liquid container. A two-fluid nozzle;
One side is connected to the compressor, the other side is branched by a branch portion, and one branch pipe forms a nozzle gas pipe that leads to the two-fluid nozzle, and the other branch pipe leads to the liquid level in the liquid container. A gas pipe constituting the gas pipe;
One end side faces the liquid in the liquid container, and the other end side has a liquid pipe leading to the two-fluid nozzle,
The container gas pipe and the liquid pipe are connected and fixed to the liquid container via a connection lid that is detachably attached to the neck of the liquid container,
In the dry mist spraying apparatus for pressure-feeding the liquid in the liquid container to the two-fluid nozzle through the liquid pipe by pressurization with gas supplied from the container gas pipe,
A dry mist spraying device adapted to adjust / set the pipe line resistance of the gas pipe in response to an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle. . The connection lid is
An inner lid to which the gas pipe for a container and the liquid pipe are attached and attached and detached in the axial direction of the neck;
The dry mist spraying device according to claim 1, wherein the dry mist spraying device is configured by an outer lid that is screw-engaged with an outer periphery of the neck portion and hermetically presses the inner lid to the tip of the neck portion. The connection lid is formed with a female screw on the inner periphery, and is non-rotatably fitted to the casing of the spraying device on the outer periphery.
The dry mist spraying device according to claim 1, wherein the liquid container is configured such that a neck portion is detachable by screw engagement with a female screw of the connection lid.   2. The dry mist spray according to claim 1, wherein the nozzle gas pipe has an increased pipe length corresponding to an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle. apparatus.   2. The dry mist according to claim 1, wherein the nozzle gas pipe has a reduced pipe diameter corresponding to an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle. Spraying equipment.   The distance from the compressor outlet of the branch part of the gas pipe is adjusted and set corresponding to an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle. 7. The dry mist spraying device according to 7. A compressor for supplying high-pressure gas;
A liquid container for storing liquid;
A spiral dry mist is generated by applying a shearing force by a pressurized gas as a swirling flow shape to the liquid film formed by the liquid supplied to the nozzle and positioned above the liquid surface of the liquid container. A two-fluid nozzle;
One side is connected to the compressor, the other side is branched by a branch portion, and one branch pipe forms a nozzle gas pipe that leads to the two-fluid nozzle, and the other branch pipe leads to the liquid level in the liquid container. A gas pipe constituting the gas pipe;
One end side faces the liquid in the liquid container, and the other end side has a liquid pipe leading to the two-fluid nozzle,
The container gas pipe and the liquid pipe are connected and fixed to the liquid container via a connection lid that is detachably attached to the neck of the liquid container,
In the method of spraying dry mist using a dry mist spraying device that pressurizes the liquid in the liquid container to the two-fluid nozzle through the liquid pipe by pressurization with gas supplied from the container gas pipe,
A dry mist spraying method comprising adjusting and setting a pipe line resistance of the gas pipe corresponding to an increase in height during use from a liquid level of the liquid container to the two-fluid nozzle. The connection lid,
An inner lid to which the gas pipe for a container and the liquid pipe are attached and attached and detached in the axial direction of the neck;
An outer lid that is screw-engaged with the outer periphery of the neck and presses the inner lid hermetically against the tip of the neck;
The dry mist spraying method according to claim 7, comprising: The connection lid is formed with a female screw on the inner periphery, and is non-rotatably fitted to the casing of the spraying method on the outer periphery,
The dry mist spraying method according to claim 7, wherein the neck portion of the liquid container is detachable by screw engagement with the female screw of the connection lid.   The dry mist spraying method according to claim 7, wherein the length of the nozzle gas pipe is increased corresponding to an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle.   8. The dry mist spraying method according to claim 7, wherein the diameter of the nozzle gas pipe is decreased in correspondence with an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle.   The distance from the branch part of the gas pipe to the compressor is adjusted and set in accordance with an increase in height during use from the liquid level of the liquid container to the two-fluid nozzle. Dry mist spraying method.

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