JP3544350B2 - Spray nozzle device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spray nozzle device in which two-fluid nozzles for mixing and injecting two fluids composed of a liquid such as a chemical solution, water, fuel oil, paint, and the like and a gas such as air are arranged so that their nozzles face each other. is there.
[0002]
[Prior art]
Conventionally, as this kind of spray nozzle, there is a two-fluid nozzle disclosed in JP-A-4-45218. The two-fluid nozzle includes a liquid ejection port for ejecting a liquid together with a compressed gas, and a gas ejection port formed around the liquid ejection port and forming a high-speed vortex in front of the liquid ejection port. The liquid ejected from the liquid ejection port is crushed by the high-speed vortex flow from the gas ejection port to become ultrafine particles and form an ultrafine mist.
[0003]
[Problems to be solved by the invention]
The ultra-fine particle mist generated by the two-fluid nozzle as described above stays in the air for a relatively long time, but in various applications such as sterilization, insecticide, and humidification, the time during which the liquid particles stay in the air is further increased. It is required to increase the spraying effect by performing the above.
An object of the present invention is to provide a high-performance spray nozzle device having a high spray effect.
[0004]
[Means for Solving the Problems]
The spray nozzle device according to claim 1, wherein the first liquid ejection port ejects the liquid, and the first gas ejection port is formed around the first liquid ejection port to form a high-speed vortex in front of the first liquid ejection port. A second nozzle for ejecting liquid, and a second gas outlet formed around the second liquid outlet to form a high-speed vortex in front of the second liquid outlet. And a first liquid ejecting port that supports the first nozzle section and the second nozzle section so that the first liquid ejecting port and the second liquid ejecting port face each other. And a support means for setting an angle between the ejection axis of the second liquid ejection port and the ejection axis of the second liquid ejection port in an angle range of 80 degrees to 90 degrees.
[0005]
In the spray nozzle device according to the first aspect, the first liquid ejection port and the second liquid ejection port are arranged to be opposed to each other by the support means, and the ejection axes of both are set in an angle range of 80 to 90 degrees. Therefore, the two fluids ejected from the first nozzle unit and the two fluids ejected from the second nozzle unit collide. That is, the fine particles ejected from the first liquid ejection port and broken by the high-speed vortex from the first gas ejection port are ejected from the second liquid ejection port and crushed by the high-speed vortex flow from the second gas ejection port. Since the liquid particles collide with the liquid fine particles formed by the above and the high-speed vortex from the second gas injection port and are further miniaturized, a mist containing extremely small liquid fine particles can be easily formed.
The liquid ejected from the first liquid ejection port and the liquid ejected from the second liquid ejection port need not always be the same.
[0006]
Further, the spray nozzle device according to claim 2 is characterized by further comprising a voltage supply means for applying a voltage to the liquid ejected from the first liquid ejection port and the second liquid ejection port.
In the spray nozzle device according to the second aspect, the liquid ejected from the first and second liquid ejection ports, that is, the liquid fine particles emitted from the first and second nozzle portions can be set to a desired potential, Adhesion to a charged object can be improved.
[0007]
According to the spray nozzle device of the third aspect, the voltage supply unit charges the liquid discharged from the first liquid ejection port and the second liquid ejection port to either positive or negative. Is controlled.
According to the spray nozzle device of the third aspect, the voltage supply means controls the voltage so that the liquid ejected from the first liquid ejection port and the second liquid ejection port is positively or negatively charged. The liquid can be easily attached even when the object to which the liquid is attached is positively or negatively charged.
[0008]
Further , another spray nozzle device includes a nozzle portion having a liquid ejection port for ejecting a liquid, and a gas ejection port formed around the liquid ejection port and forming a high-speed vortex in front of the liquid ejection port; A voltage supply unit configured to control a voltage supplied to the liquid discharged from the liquid ejection port so as to positively or negatively charge the liquid discharged from the ejection port.
According to mists nozzle device this, for controlling the voltage which the voltage supply means is supplied to the liquid as well to charge in any of the liquid ejected from the liquid ejection nozzle positive or negative, the liquid adheres object The liquid can be easily attached even when is positively or negatively charged.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a spray nozzle device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram conceptually illustrating the structure of the spray nozzle device of the embodiment. The spray nozzle device includes a sprayer body 20 including first and second nozzle portions 21 and 22 each forming an ultrafine mist, and a predetermined portion such as a disinfectant or the like to be atomized in both nozzle portions 21 and 22. A liquid supply source 30 for supplying liquid, a compressed air source 40 for supplying compressed air for crushing liquid to both nozzle portions 21 and 22, and a voltage for charging ultrafine particles ejected from each nozzle portion 21 and 22. And a control device 60 for controlling the operation of the liquid supply source 30, the compressed air source 40, and the power supply device 50.
[0010]
The first nozzle portion 21 and the second nozzle portion 22 that constitute the sprayer body 20 are two-fluid nozzles having the same structure. The two nozzle portions 21 and 22 are attached to a fixing member 23 made of an insulating material having an L-shaped cross section, and are arranged to face each other at an appropriate angle and at an appropriate interval. A fixing member 23 that supports the nozzle portions 21 and 22 is fixed to a distal end portion of a support member 24. By turning the support member 24 in an appropriate direction, the ultrafine mist M sprayed from the sprayer main body 20 is removed. The emission direction can be adjusted. Note that the fixing member 23 and the supporting member 24 constitute supporting means.
[0011]
The injection port 21a of the first nozzle section 21 and the injection port 22a of the second nozzle section 22 are disposed to face each other in a close proximity of about 10 mm. Thereby, the ultrafine particle mist M emitted from both nozzle portions 21 and 22 collides, and the liquid fine particles in both ultrafine particle mist M can be further reduced to fine particles. At this time, the angle θ between the ejection axis A1 of the first nozzle unit 21 and the ejection axis A2 of the second nozzle unit 22 is set in an angle range of 80 to 90 degrees. As will be described in detail below, this is for the purpose of efficiently miniaturizing the size of the liquid fine particles ejected from both the ejection ports 21a and 22a.
[0012]
FIG. 2A is a plan view of the first nozzle unit 21, and FIG. 2B is a longitudinal sectional view of the nozzle unit 21.
The nozzle portion 21 has a structure in which a cylindrical core 27 made of brass is screwed into a nozzle housing 26 made of a cylindrical stainless material. The nozzle casing 26 has a compressed air introduction port 26a for connecting to a compressed air introduction pipe 28 on a side surface, and a tapered opening 26b having a circular cross section at a tip end. The core 27 has a liquid inlet 27a at the root side for connection with the liquid introduction pipe 29, and a liquid outlet 27b having a circular cross section at the tip end. A cone-shaped spiral forming body 27c is formed around the liquid ejection port 27b.
[0013]
As shown in the drawing, the core 27 is fixed in place in the nozzle casing 26, so that a cylindrical compressed air supply chamber S1 extending in the direction of the injection axis A1 and a vortex chamber S2 on the tip end side of the spiral forming body 27c. Is formed, and an annular gas injection port 21b is formed on the side of the vortex chamber S2 facing the liquid injection port 27b.
Note that the root sides of the nozzle casing 26 and the core 27 are sealed by an O-ring 21c to prevent the compressed air from leaking backward. The external thread 26d formed on the outer periphery of the distal end side of the nozzle casing 26 is screwed with the fastening nut 21d, and the first nozzle portion 21 can be attached to the fixing member 23 of FIG.
[0014]
FIG. 3 is a front view of the first nozzle unit 21 shown in FIG. A circular liquid ejection port 27b is disposed at the center, and an annular gas ejection port 21b is disposed therearound. A plurality of spiral guide holes 27ca formed in a conical surface of a spiral forming body 27c disposed inside the nozzle casing 26 and extending in a spiral shape are connected to the gas injection port 21b.
[0015]
Returning to FIG. 2, the compressed air supplied from the compressed air inlet 26a becomes a high-speed airflow when passing through the compressed air supply chamber S1 and passing through the swirl guide hole 27ca formed in the spiral forming body 27c. In the vortex chamber S2, a swirling airflow is formed by the high-speed airflow pumped by the swirling guide hole 27ca, and the high-speed swirling airflow is ejected from the narrowed annular gas ejection port 21b toward the front of the liquid ejection port 27b. A high-speed eddy current having a tapered cone shape is formed at a position close to the front of the ejection port 27b.
[0016]
On the other hand, an appropriate flow rate of a liquid such as a sterilizing agent is supplied to the liquid inlet 27a. The liquid discharged from the liquid outlet 27b via the liquid inlet 27a comes into contact with the conical high-speed vortex jet formed from the gas outlet 21b, is crushed, and is forcibly mixed and diffused into an ultrafine liquid. Distributed. Since the diameter of the liquid inlet 27a is hardly smaller than that of the liquid inlet 27a, clogging of the liquid does not occur.
[0017]
Returning to FIG. 1, although not shown, the liquid supply source 30 includes a tank for storing the liquid to be sprayed, a pump for supplying the liquid in the tank to the sprayer main body 20 through the liquid introduction pipe 29, and the like. Is provided. Since a negative pressure is formed at the liquid ejection ports 27b of the nozzle portions 21 and 22, a pressurizing supply device for supplying the liquid is not necessarily required.
[0018]
The compressed air source 40 is a compressor that forms compressed air having a desired pressure, and supplies necessary compressed air to the sprayer main body 20 via a compressed air introduction pipe 28.
The power supply device 50 is a voltage generating device that generates a desired DC high voltage, supplies an appropriate voltage to the core 27 of each of the nozzle portions 21 and 22 constituting the sprayer main body 20, passes through the core 27, The emitted liquid is charged. The power supply device 50 and the core 27 of each of the nozzle portions 21 and 22 constitute a voltage supply unit.
[0019]
The control device 60 is a computer including a CPU, a memory, and a display. The control device 60 controls the air pressure generated by the compressed air source 40, adjusts the supply amount of the liquid from the liquid supply source 30, and controls the power supply device 50. Thus, the voltage applied to the core 27 of each of the nozzle portions 21 and 22 can be set to an appropriate positive or negative value, and the operating state of the spray nozzle device is notified to the person operating the spray nozzle device.
[0020]
Hereinafter, the operation of the spray nozzle device shown in FIG. 1 will be described. First, predetermined compressed air is supplied from the compressed air source 40 to each of the nozzle portions 21 and 22. At the same time, an appropriate amount of liquid is supplied from the liquid supply source 30 to each of the nozzle portions 21 and 22. As a result, the liquid is discharged from the liquid ejection ports 27b of the nozzle portions 21 and 22, and the liquid is crushed by the high-speed vortex from the surrounding gas ejection ports 21b to form mist of liquid fine particles. At this time, since the first and second nozzle portions 21 and 22 are disposed close to and opposed to each other, and the respective injection axes A1 and A2 are set in an angle range of 80 to 90 degrees, the first and second nozzle portions 21 and 22 The sprayed mist and the mist sprayed from the second nozzle portion 22 collide effectively. As a result, the liquid fine particles in the mist are further miniaturized, and the ultrafine mist M containing extremely small liquid fine particles can be easily formed. Therefore, when spraying a germicide or the like, sterilization can be efficiently performed with a small amount of germicide. When the paint is sprayed, the paint can be sprayed thinly and uniformly.
[0021]
When forming the mist, a positive or negative high voltage is supplied to the core 27 of the nozzle portions 21 and 22 to charge the liquid emitted from the injection ports 21a of the nozzle portions 21 and 22. . When the voltage supplied to the core 27 is a positive high voltage, the ultrafine mist M is positively charged, so that the liquid fine particles in the sprayed ultrafine mist M easily adhere to the negatively charged object. Conversely, if the voltage supplied to the core 27 is a negative high voltage, the ultrafine mist M is negatively charged, and the liquid fine particles in the sprayed ultrafine mist M adhere to the positively charged object. It will be easier. Utilizing such a phenomenon, the ultrafine particle mist M can be appropriately charged in accordance with the charging tendency of the fine particles to be treated and the charging tendency of harmful microorganisms such as floating bacteria, and the adhesion effect to the fine particles and In addition, the effect of eliminating harmful microorganisms can be enhanced. Further, even when an insecticide or the like is sprayed on a plant, the insecticide or the like can be easily attached to a leaf, a stem or the like of the plant.
[0022]
The value and the sign of the high voltage supplied to the core 27 of the nozzle sections 21 and 22 can be changed with time according to the required purpose. For example, by repeating a cycle in which the negatively charged ultrafine particle mist M is generated for about 1 minute and then the positively charged ultrafine particle mist M is generated for about 1 minute, the harmful microorganisms that are easily charged positively and the negatively charged one are removed. The harmful microorganisms that are easy to perform can be efficiently and simultaneously sterilized. The negatively charged ultrafine particle mist M is generated for about 1 minute, then the negatively and positively charged ultrafine particle mist M is generated for about 1 minute, and the positively charged ultrafine particle mist M is generated for 1 minute. The method of charging the ultrafine particle mist M can be appropriately selected, for example, by repeating a cycle of generating the minute mist.
[0023]
Note that the ultrafine particle mist M can be formed without applying a voltage to the core 27 of the nozzle portions 21 and 22. When the nozzle portions 21 and 22 having the structures shown in FIGS. 2 and 3 are used, friction is hardly generated when the liquid is ejected from the liquid ejection port 27b, so that a voltage must be applied to the core 27. In this case, the ultrafine particle mist M is not charged. Here, the mist ejected from the nozzle portions 21 and 22 collide with each other. However, since the fine particles in the mist are small, not only the surroundings where the charges are biased are destroyed, but the entire fine particles are destroyed. It is thought that it is done. Therefore, the probability of the charged fine particles being broken is extremely low. This has been experimentally confirmed. Since the uncharged ultrafine particle mist M is not electrostatically attracted to a floor or the like, it tends to stay in the air for a long time. Therefore, if the liquid to be sprayed is water and the ultrafine particle mist M is formed by a spray nozzle device as shown in FIG. 1, a desired humidifying effect can be obtained in a short time.
[0024]
Hereinafter, specific examples will be described. In this case, the diameter of the liquid ejection port 27b was set to 2 mm, and compressed air of 3 kg / cm ² was supplied to both nozzle portions 21 and 22. The liquid for spraying was tap water, which was supplied to both nozzle portions 21 and 22 in a total of 50 cc / min. When the angle θ formed by the two nozzle portions 21 and 22 is 80 degrees, the average particle size of the liquid fine particles is about 8.8 microns when the distance between the opposed liquid ejection ports 27b is 9 mm. Similarly, when the angle θ between the two nozzle portions 21 and 22 was 85 degrees, the average particle size of the liquid fine particles was about 8.4 microns when the distance between the opposing liquid ejection ports 27b was 8 mm. Further, when the angle θ between the two nozzle portions 21 and 22 was 90 degrees, the average particle size of the liquid fine particles was about 10.0 μm when the distance between the opposing liquid ejection ports 27b was 8 mm. When the angle θ formed by the two nozzle portions 21 and 22 was 70 degrees, the average particle size of the liquid fine particles was about 13.7 microns when the distance between the opposed liquid ejection ports 27b was 10 mm. From the above examples, it can be understood that the particle diameter of the liquid fine particles can be minimized when the angle θ formed by both nozzle portions 21 and 22 is in the range of 80 to 90 degrees.
[0025]
【The invention's effect】
According to the present invention, the two fluids ejected from the first nozzle and the two fluids ejected from the second nozzle collide with each other, and the liquid fine particles ejected from each nozzle are further miniaturized. Two fluids containing small liquid fine particles can be easily formed. Thereby, the residence time of the sprayed liquid fine particles can be lengthened, and the spray effect can be enhanced.
Further, since the liquid fine particles emitted from the first and second nozzle portions can be set to a desired potential, the spraying effect can be improved by improving the adhesion to the charged object.
In addition, since the voltage supply means controls the voltage so that the liquid ejected from the liquid ejection port is positively or negatively charged, the object to which the liquid adheres is positively or negatively charged. Can easily adhere the liquid.
[Brief description of the drawings]
FIG. 1 is a diagram conceptually illustrating the structure of a spray nozzle device according to an embodiment.
2A is a plan view of a nozzle unit, and FIG. 2B is a side cross-sectional view of the nozzle unit.
FIG. 3 is a front view of a nozzle unit shown in FIG. 2;
[Explanation of symbols]
Reference numeral 20: sprayer body, 21, 22: nozzle portion, 21a, 21b: injection port, 21b: gas injection port, 23: fixing member, 26: nozzle casing, 26a: compressed air introduction port, 27: core, 27a: liquid Inflow port, 27b: liquid ejection port, 27c: spiral formed body, 30: liquid supply source, 40: compressed air source, 50: power supply device, 60: control device, A1, A2: injection axis, M: ultrafine mist.

Claims (3)

The has a first liquid injection port for injecting liquid, and a first gas injection port to form a high-speed vortex tapered conical front of the first liquid injection port is formed around the first liquid injection port One nozzle part,
The has a second liquid injection port for injecting liquid, and a second gas injection openings to form a high-speed vortex tapered conical front of the second liquid injection port is formed around the second liquid injection port 2 nozzles,
Supporting the first nozzle portion and the second nozzle portion such that the first liquid ejection port and the second liquid ejection port face each other, and the ejection axis of the first liquid ejection port and the second liquid ejection port Supporting means for setting an angle between the injection axis and the injection axis to an angle range of 80 degrees to 90 degrees ,
A spray nozzle device in which two fluids ejected from the first nozzle portion collide with two fluids ejected from the second nozzle portion . The first liquid injection port and spray nozzle apparatus to that claim 1, further comprising a voltage supplying means for supplying a voltage to the liquid discharged from the second liquid injection port. 3. The voltage supply device according to claim 2, wherein the voltage supply unit controls a voltage so that the liquid ejected from the first liquid ejection port and the second liquid ejection port is positively or negatively charged. Spray nozzle device.

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