JP4551117B2 - Fine particle spray device - Google Patents

Description

  The present invention relates to a fine particle spraying device for spraying liquid fine particles such as water, chemicals, oils, resins and solvents.

  Conventionally, in order to produce liquid fine particles, a method of crushing and refining an extremely small amount of liquid with a large amount of gas, a method of obtaining fine particles using heat evaporation, a method of obtaining fine particles by ultrasonic vibration, etc. Yes. In order to crush and refine a very small amount of liquid with a large amount of gas, a two-fluid nozzle that crushes and refines the liquid with gas is used. The two-fluid nozzle ejects a liquid such as water or a chemical solution from a liquid ejecting portion at the tip of the nozzle, and ejects a gas such as air from a gas ejecting portion provided around the liquid ejecting portion. Are mixed and jetted, and the liquid is crushed and refined with gas to obtain liquid fine particles.

  However, in the method of crushing and refining a liquid with a gas, it is difficult to obtain fine particles with a uniform particle size of 5 μm or less in average particle size, and there is a problem that the particle size varies greatly. In view of this, the present applicant has previously proposed a fine particle generation apparatus with a small variation in particle diameter of fine particles in Patent Document 1 described later.

  FIG. 5 shows a microparticle device described in Patent Document 1 described later. The particulate generator 2 includes a cylindrical particulate sorting container 10. A two-fluid nozzle 12 that fixes and pulverizes water (liquid) with air (gas) to generate fine particles is fixed to the lid portion 10 a of the fine particle sorting container 10.

  The two-fluid nozzle 12 causes water to be ejected from a gas ejection port provided at the outer peripheral portion of the liquid ejection port against water ejected from a liquid ejection port provided at the tip of the nozzle, thereby causing the water to air By crushing and refining, water fine particles are generated. For this reason, air is supplied to the two-fluid nozzle 12 from the nozzle supply compressor 34 via the gas supply pipe 36 and water is supplied from the liquid storage container 26 via the liquid supply pipe 30. . The liquid supply pipe 30 is provided with a needle valve 32 for adjusting the amount of liquid supplied to the two-fluid nozzle 12, and water is supplied to the two-fluid nozzle 12 from other than the liquid storage container 26 via the branch supply pipe 30a. Can be supplied.

  In the fine particle sorting container 10, there is provided a rectifying cone 14 that guides the fine particles generated by the two-fluid nozzle 12 to the lower part of the fine particle sorting container 10. Further, secondary air (secondary gas) is also supplied to the lower portion of the rectifying cone 14 from the secondary gas compressor 16 through the secondary gas supply pipe 18. Further, in the fine particle sorting container 10, three fine particle sorting plates 20, 22, and 24 that suppress the floating of the fine particles guided to the lower part of the fine particle sorting container 10 and sort the fine particles according to the particle diameter are provided. It has been. The fine particle sorting plates 20, 22, and 24 are provided with a large number of fine particle passage holes. The fine particle passage hole is smaller as the upper fine particle sorting plate is.

  A discharge part 28 for spraying the fine particles that have passed through the fine particle sorting plates 20, 22, 24 is attached to the lid part 10 a of the fine particle sorting container 10.

  A liquid discharge tank 10b communicating with the liquid storage container 26 is provided at the bottom of the fine particle sorting container 10, and water accumulated at the bottom of the fine particle sorting container 10 is returned to the liquid storage container 26 from the liquid haul outlet 10b. It is.

  In this particulate generator 2, when air is supplied to the two-fluid nozzle 12 from the nozzle supply compressor 34 via the gas supply pipe 36, the air is ejected from the gas outlet at the tip of the two-fluid nozzle 12. By the ejection of this air, the water in the liquid storage container 26 is sucked up, supplied to the two-fluid nozzle 12 via the liquid supply pipe 30, and ejected from the liquid ejection port. The water ejected from the liquid ejection port is crushed and refined by the air ejected from the gas ejection port to form water fine particles. The fine water particles are guided to the lower part of the fine particle sorting container 10 by the rectifying cone 14. On the other hand, air is also supplied from the secondary gas compressor 16 to the vicinity of the opening at the bottom of the rectifying cone 14 via the secondary gas supply pipe 18.

  The fine particles guided to the lower part of the fine particle sorting container 10 rise on an ascending air current generated by the air ejected from the two-fluid nozzle 12 and the air ejected from the secondary gas supply pipe 18.

  Here, the fine particles having a large particle diameter cannot pass through the fine particle sorting plates 20, 22, 24 and fall to the bottom of the fine particle sorting container 10 due to gravity, and only fine particles having a predetermined particle diameter or less are collected. 24 can be passed. However, fine particles smaller than the predetermined particle size evaporate and disappear, so that only fine particles with a predetermined particle size are selected and sprayed to the outside from the discharge unit 28.

  In this fine particle generator 2, when changing the particle diameter of the generated fine particles, the pressure of the air supplied to the two-fluid nozzle 12 and the pressure of the secondary air supplied into the fine particle sorting container 10 are adjusted. . That is, when the pressure of the air supplied to the two-fluid nozzle 12 is increased by controlling the nozzle supply compressor 34, the water particles ejected from the two-fluid nozzle 12 are further finely pulverized to reduce the particle size. The air flow rising in the fine particle sorting container 10 becomes faster, and the fine particles disappeared by evaporation while passing through the fine particle sorting container 10 are reduced. Further, when the rising airflow becomes faster, fine particles having a large particle diameter are quickly blocked by the fine particle sorting plates 20, 22 and 24 before evaporating, and cannot pass through the fine particle sorting plates 20, 22 and 24. Thus, when the pressure of the air supplied to the two-fluid nozzle 12 is increased, the particle size of the fine particles discharged from the discharge unit 28 is decreased. Conversely, when the pressure of the air supplied to the two-fluid nozzle 12 is lowered, the particle size of the fine particles discharged from the discharge unit 28 is increased.

  Further, even if the pressure of the air supplied from the secondary gas compressor 16 into the fine particle separation container 10 is increased, the air flow rising in the fine particle separation container 10 becomes faster, and the fine particles discharged from the discharge unit 28 are discharged. The particle size becomes smaller. Conversely, when the pressure of the air supplied from the secondary gas compressor 16 into the fine particle sorting container 10 is lowered, the particle size of the fine particles discharged from the discharge unit 28 increases.

  Further, in order to increase the amount of fine particles discharged from the discharge unit 28 of the fine particle sorting container 10, the water supplied to the two-fluid nozzle 12 by adjusting the needle valve 32 provided in the liquid supply pipe 30 is adjusted. By increasing the amount, the amount of fine particles discharged from the discharge unit 28 can be increased appropriately.

  According to this fine particle generator 2, fine particles can be sorted by particle size, and water fine particles having a uniform particle size of 5 μm or less can be sprayed.

  And since this fine particle generator 2 can generate fine particles having a uniform particle size, sterilization, insecticidal, deodorization, ultra-thin film coating, painting, granulation, which have required advanced techniques to date. It can be used at low cost in fields that require fine particles such as combustion.

Of course, in this fine particle generator, an appropriate liquid such as a chemical solution, oils, solvent, resin or the like may be supplied to the two-fluid nozzle 12 in place of water to generate these fine particles. When air cannot be used depending on the type of liquid, a gas other than air can be supplied to the two-fluid nozzle 12 and the secondary gas supply pipe 18.
Japanese Patent Laid-Open No. 2003-10741

  According to the fine particle generator 2, fine particles having a uniform particle diameter of 5 μm or less can be sprayed for ultra-thin film coating or painting.

  However, when the fine particle generator 2 tries to spray fine particles over a large area for ultra-thin film coating or painting, the spray port 28c of the discharge unit 28 is small, so that the fine particles are sprayed uniformly and efficiently over a wide area. There was a problem that it was not easy.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the fine particle spraying apparatus which can spray the fine particle which has a uniform particle diameter uniformly and efficiently over a wide range.

In order to solve the above-mentioned problem, the invention according to claim 1 is a particulate spraying device connected to a conduit for delivering liquid particulates generated by the particulate generator, wherein the particulate spraying device extends from the conduit. The narrowing nozzle along the longitudinal direction of the staying chamber, and an expansion duct connecting the conduit and the retention chamber, the expansion duct being separated from the narrowing nozzle and the narrowing nozzle. It is characterized by having a flat shape that becomes wider toward the exit side in a plane perpendicular to.

The invention according to claim 2 is a fine particle spraying device connected to a conduit for delivering liquid fine particles generated by the fine particle generating device, wherein the fine particle spraying device includes a retention chamber extending from the conduit, and the retention An opening disposed along the longitudinal direction of the chamber, and an expansion duct connecting the conduit and the staying chamber, the expansion duct being separated from the opening and orthogonal to the direction of the opening It is characterized by a flat shape that becomes wider toward the exit side .

According to the first aspect of the present invention, when the liquid fine particles generated by the fine particle generator enter the staying chamber that has expanded from the conduit through the conduit and the expansion duct together with the air, the air flow is temporarily blocked. While in the air, it is uniformly dispersed in the air throughout the residence chamber. For this reason, the liquid fine particles are sprayed uniformly from the flat narrow nozzle provided in the staying chamber. Thus, when the fine particle spraying device is narrowed and moved in the direction perpendicular to the nozzle while spraying the fine particles from the narrow nozzle , the fine particles having a uniform particle diameter can be sprayed uniformly and efficiently over a wide range. Thereby, ultra-thin film coating, painting, etc. can be performed rapidly with uniform thickness.

Further , the gap between the tip of the conduit and the staying chamber is narrowed and separated from the nozzle, and is connected by a flattened expansion duct that becomes wider toward the outlet side in a plane perpendicular to the narrowing nozzle, so that the staying chamber is further connected. Fine particles can be injected uniformly . This allows more uniformly sprayed from flat narrow nozzle fine particles.

According to the invention according to claim 5, the invention is obtained by changing the flat narrow nozzle provided in the staying chamber in the invention according to claim 1 into an opening arranged along the longitudinal direction of the staying chamber. The same effect as that of the invention according to claim 1 is obtained.

  Hereinafter, the fine particle spraying device of the present invention will be described with reference to FIGS. FIG. 1 is a vertical view of a fine particle spray device according to an embodiment of the present invention. FIG. 2 is a front view of the fine particle spray device. FIG. 3 is a longitudinal sectional view of a fine particle generator that supplies fine particles to the fine particle spraying device. The fine particle spray device 30 shown in FIGS. 1 and 2 is connected to the discharge unit 28 of the fine particle generator 2A shown in FIG. 3 via a flexible conduit 28b.

  3A is substantially the same as the conventional fine particle generator 2 shown in FIG. Therefore, in FIG. 4, the same parts as those in FIG. 5 are given the same reference numerals, and detailed description of the fine particle generator 2A is omitted. However, the secondary gas supply pipe 18 extends from the side surface of the fine particle sorting container 10 to a position immediately below the rectifying cone 14 so as to eject secondary air (secondary gas) horizontally. Further, a liquid storage container (not shown) that stores the liquid supplied to the two-fluid nozzle 12 is arranged away from the fine particle sorting container 10. For this reason, the waste liquid collected at the bottom of the fine particle sorting container 10 passes from the liquid haul outlet 10b to the waste liquid pipe 10c, the socket 10d fixed to the leg 10e of the fine particle sorting container 10, and a conduit (not shown) connected to the socket 10d. The liquid storage container is returned. Note that the number of sorting plates 20, 22, and 24 is not limited to three, and can be appropriately increased or decreased according to requirements such as cost and uniformity of particle size.

  As shown in FIGS. 1 and 2, this fine particle spraying device 30 has a cylindrical shape that is long in the direction of the shaft 32c where the air flow in which the fine particles A delivered from the conduit 28b of the fine particle generating device 2A are dispersed is temporarily stopped and retained. The retention chamber 32 is provided. Here, the conduit 28b is made flexible so that the fine particle spray device 30 is freely movable.

  The side surface 34 of the retention chamber 32 and the conduit 28b of the particulate generator 2 are connected by a flat expanding duct 36. The inlet of the expansion duct 36 is a cylindrical base 38 for connecting to the conduit 28b, and the outlet of the expansion duct 36 has a flat shape. The outlet of the expansion duct 36 is connected to the side surface 34 of the retention chamber 32 at the center in the longitudinal direction of the retention chamber 32 with its longitudinal direction parallel to the direction of the axis 32c of the retention chamber 32. In the cross section of the expanding duct 36, the width in the longitudinal direction is made wider toward the outlet side (see FIG. 2), and the width in the direction orthogonal to the longitudinal direction is made narrower toward the outlet side (see FIG. 1). By the expansion duct 36, the fine particles can be injected into the staying chamber 32 substantially uniformly along the axial direction. The expanding duct 36 is formed integrally with the staying chamber 32, but may be formed separately from the staying chamber 32.

A narrowing nozzle 40 having a flat cross section along the longitudinal direction of the staying chamber 32 is provided on the side surface 34 of the staying chamber 32. A slit 42 is opened at the tip of the narrowing nozzle 40 as a nozzle outlet. The slit 42 is narrowed so as to coincide with the shaft 32 c of the staying chamber 32 in a front view, and is provided to the full length in the longitudinal direction of the nozzle 40. As for the cross section of this narrowing nozzle 40, the width | variety of the direction orthogonal to a longitudinal direction is narrowed by the exit side (refer FIG. 1). This narrowing nozzle reduces the energy loss of the airflow ejected from the slit 42 and rectifies the airflow. The narrowing nozzle 40 is also formed integrally with the staying chamber 32, but may be formed separately from the staying chamber 32.

  By the way, the narrowing nozzle 40 is directed in a direction orthogonal to the expansion duct 36 and provided at a position as far as possible from the expansion duct 36. Therefore, the expansion duct 36 is narrowed with respect to the shaft 32 c of the stay chamber 32 and is connected to the side surface 34 of the stay chamber 32 at a position close to the symmetrical position of the nozzle 40. As a result, the air flow including the fine particles A discharged from the expansion duct 36 into the staying chamber 32 is immediately narrowed and does not flow into the nozzle 40, but temporarily stays in the staying chamber 32, so that the fine particles A are uniformly in the staying chamber 32. Will be distributed.

  The width and length of the slit 42, the size of the staying chamber 32, and the like are determined by the generation capability of the fine particles A of the fine particle generator 2.

  According to this fine particle spray device 30, the fine particles A of water having a uniform particle size of 5 μm or less generated by the fine particle generator 2 enter the expansion duct 36 from the discharge pipe 28b together with air, and this expansion duct 36. It spreads to the full width inside and enters the staying chamber 32. Since the narrowing nozzle 40 and the expansion duct 36 are orthogonal to each other and the distance between them is also large, the fine particles A are narrowed from the expansion duct 36 and do not enter the nozzle 40 immediately. Since the flow path widens in the staying chamber 32, the air stays at a slower flow rate. While the air is temporarily retained, the fine particles A are uniformly dispersed in the air in the retention chamber 32. Thus, the fine particles A are narrowed and sprayed uniformly from the slit 42 at the tip of the nozzle 40.

  When the fine particle A is sprayed from the slit 42 while the fine particle spraying device 30 is moved in the direction orthogonal to the slit 42, the fine particle A having a uniform particle size can be uniformly and efficiently sprayed over a wide range. Coating and painting can be performed quickly with a uniform thickness.

  By the way, the present invention is not limited to the above embodiment, and various modifications are possible as follows, for example.

  In the above embodiment, the retention chamber 32 is cylindrical. However, as long as the chamber is expanded from the conduit 28b so that the air and the particulates A sent from the particulate generator 2 can be temporarily retained, ( Appropriate shapes are possible, such as a triangular prism shape as shown in A) and a quadrangular prism shape as shown in FIG.

In the above embodiment, the nozzle 40 is narrowed in the staying chamber 32 and the slit 42 is opened at the tip of the narrowing nozzle 40. However, in order to cut costs, the staying chamber 32 may be provided with an opening directly. As the openings, in addition to the slits 42, as shown in FIG. 4D, a large number of small openings 44 may be arranged in the stay chamber 32 while being elongated and distributed in a straight line or a belt shape. Also in this case, since the fine particles A are uniformly sprayed from the large number of openings 44, the same effect as the above-described embodiment can be obtained.

  An electrode may be provided in the narrowing nozzle 40 or the staying chamber 32 to supply power, and the fine particles A may be charged and sprayed. When the fine particles A are charged, the adhesion is improved and ultra-thin coating or painting can be performed more efficiently. Furthermore, the fine particles A may be heated and sprayed by providing a heater in the narrowing nozzle 40 or the staying chamber 32. When the fine particles A are heated, adhesion is improved, and ultra-thin film coating and painting can be performed more efficiently.

It is a longitudinal cross-sectional view of the fine particle spraying apparatus which concerns on one Example of this invention. It is a front view of the fine particle spray device. It is a longitudinal cross-sectional view of the fine particle generator which supplies fine particles to the fine particle spray device. It is a figure explaining another Example of this invention. It is a figure explaining the conventional fine particle spraying apparatus.

Explanation of symbols

2A Particulate generator 28b Conduit 30 Particulate sprayer 32 Residence chamber 36 Expanding duct 40 Narrowing nozzle 42 Slit 44 Opening A Particulate

Claims (2)

A fine particle spray device connected to a conduit for delivering liquid fine particles generated by a fine particle generator,
The fine particle spray device includes a residence chamber that extends from the conduit, a flat narrow nozzle along the longitudinal direction of the residence chamber, and an expansion duct that connects the conduit and the residence chamber.
The fine-particle spraying apparatus is characterized in that the expansion duct has a flat shape that is separated from the narrowing nozzle and becomes wider toward the outlet side in a plane orthogonal to the narrowing nozzle . A fine particle spray device connected to a conduit for delivering liquid fine particles generated by a fine particle generator,
The fine particle spray device includes a residence chamber that extends from the conduit , an opening that is disposed along a longitudinal direction of the residence chamber, and a spreading duct that connects the conduit and the residence chamber.
The fine-particle spraying apparatus is characterized in that the expanding duct is separated from the opening and has a flat shape that becomes wider toward the outlet side in a plane perpendicular to the direction in which the opening is directed .

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