JP2011161309A - Atomizing nozzle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle device capable of efficiently generating fine droplets substantially free of large droplets and of cooling or humidifying the atmosphere. <P>SOLUTION: The nozzle device includes a nozzle 1 (such as a single-fluid nozzle) that sprays droplets (mist) in a conical form by ejecting a pressurized liquid, and a separation unit 4. The separation unit 4 includes a cylindrical body 5, a separation plate 7 disposed in the vicinity of a spray hole 2 to separate droplets present in the periphery of the spray wherein large droplets are intermingled, an opening 8 formed in the separation plate 7 to allow fine droplets present in the inner area of the spray to pass therethrough, a porous body or an absorber body 9 attached to the inner face of the separation plate 7, and a hood 5a extending from the separation plate 7 in the forward direction. The atmosphere is humidified or cooled utilizing the vaporization and the latent heat of evaporation of the fine droplets having passed through the opening 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a nozzle device equipped with a fine atomizing nozzle suitable for generating fine water droplets (for example, low flow velocity fine droplets) useful for humidification, cooling, and the like.

  As a nozzle that atomizes and sprays water for humidification and cooling, a one-fluid nozzle that sprays from a small-diameter orifice at a high pressure of 2 MPa or more is known. This nozzle has an advantage that energy consumption is remarkably reduced as compared with humidification using ultrasonic waves and humidification using two fluids (water and air, etc.).

  However, since water is pressurized and sprayed, the sprayed water droplets have a wide particle size distribution, and the entire sprayed water droplets cannot be atomized. For this reason, the height of the nozzle is adjusted. For example, JP 2006-177578 A (Patent Document 1) describes the installation height of a spray nozzle that sprays water as mist in a temperature-falling spray system that sprays water as mist to lower the temperature of a target space. It is disclosed that the spray amount of mist is set based on the Sauter average particle diameter of mist sprayed from the spray nozzle. In this spray system, the installation height of the spray nozzle and the spray amount of the mist are set appropriately based on the Sauter average particle diameter of the mist, thereby properly cooling the person without getting wet.

  However, when it is used for cooling the atmosphere by using latent heat due to mist evaporation in a high temperature period such as summer, it is necessary to increase the spray distance. On the other hand, when it is used for humidification, it is necessary to design a long absorption distance for humidification and to remove water droplets that do not evaporate with a predetermined device, which makes the entire device larger and difficult to make a compact spray nozzle device. It is.

JP 2006-177578 A (paragraphs [0006] [0007])

  Accordingly, an object of the present invention is to provide a nozzle device that can substantially generate minute water droplets without substantially containing coarse water droplets.

  Another object of the present invention is to provide a nozzle device capable of efficiently removing coarse water droplets and generating fine water droplets having a narrow particle size distribution width of sprayed water droplets.

  Still another object of the present invention is to provide a nozzle device capable of effectively cooling or humidifying the atmosphere without adjusting the spray distance.

  Another object of the present invention is to provide a compact nozzle device with low energy consumption.

  The inventors of the present invention have focused on the fact that large water droplets are mixed in the peripheral area of the spray-shaped spray, and that very small liquid droplets occupy the inner area without any large liquid droplets. As a result of diligent investigations, it was possible to efficiently remove coarse droplets with a large droplet size in the vicinity of the spray port, and to atomize atomized water droplets with a very small droplet size into a mist. The inventors found that it can be sprayed and completed the present invention.

  That is, the nozzle device of the present invention sprays liquid droplets (mist) in the form of weights by discharging pressurized liquid from the spray holes. In particular, the pressurized liquid is discharged from the spray holes using a single fluid nozzle, and droplets (mist) are sprayed in a weight shape. This nozzle device is provided with a separation unit that allows the passage of droplets in the inner spray area in the vicinity of the spray holes and separates the droplets in the outer peripheral area of the spray. Therefore, it is possible to remove droplets that contain coarse droplets in the outer peripheral area, humidify or adjust the atmosphere using volatilization of the inner area's minute droplets, and use the latent heat of the minute droplets to Or the space can be cooled. Therefore, it can be said that the nozzle device of the present invention is a humidifying (humidity adjusting) or cooling nozzle device.

  The separation unit includes an opening (a region allowing the passage of liquid droplets in the spray inner region) having a central portion located on the spray center (axis) line and having an inner diameter smaller than the outer diameter of the spray region. It may be. When such an opening is formed, droplets in the inner spray area can be smoothly passed and sprayed. In addition, the separation unit may be disposed, for example, by positioning an area that allows the passage of droplets in the inner area of the spray on the spray center line (or the axis) that is 0.5 to 25 cm away from the spray hole. Good. In such a form, coalescence / growth of spray droplets can be suppressed, and fine droplets can be sprayed. Further, the separation unit has a region where Dv99 (particle size corresponding to 99% of the cumulative particle size curve (volume conversion)) allows passage of a droplet having a size of 50 μm. In other words, the separation unit regulates the passage of droplets having a droplet diameter exceeding 50 μm in the spray outer peripheral region and allows the droplets to pass in the spray inner region (such as the opening).

  Furthermore, you may attach the porous body or absorber which can absorb a droplet to the inner surface of a separation unit. By using such a porous body or absorber, coarse droplets can be efficiently separated and removed from the spray droplets. Further, in a sealed space such as a box-shaped sealed space, the nozzle and the separation unit are arranged in a state where the spray hole faces the region of the separation unit that allows the passage of droplets in the spray inner region. Also good. A hood (for example, a windproof cover) may be extended from the separation unit in the spraying direction. In such a form, the spray area can be made independent, and merging with adjacent spray areas and coalescence / growth of droplets can be suppressed. A passage for collecting the separated droplets may be formed in the nozzle device or the separation unit. Using this passage, the separated droplets may be discharged or guided to a discharge pump (a pump that supplies liquid to the nozzle). Moreover, you may form the area | region which accept | permits the passage of the droplet of a spraying inner area among separation units in mesh shape. For example, a mesh member may be attached to the opening. When a mesh-like region is used, even if coarse droplets are mixed in the spray droplets, the droplets in which the coarse droplets are mixed can be efficiently separated and removed, and fine droplets can be sprayed.

  The present invention is a method for spraying pressurized liquid from a spray hole of a nozzle in the form of a spindle, humidifying or cooling, allowing the passage of droplets in the spray inner area in the vicinity of the spray hole, and It also includes a method of providing a separation unit for separating the droplets in the outer peripheral area of the spray and humidifying or cooling with the fine droplets.

  In the present invention, coarse droplets existing in the outer peripheral area of the spray can be separated by the separation unit, so that coarse droplets (water droplets and the like) are substantially not included, and minute droplets (water droplets and the like) can be efficiently generated. In particular, coarse water droplets can be efficiently removed without using a complicated separation device such as an eliminator, and fine water droplets having a narrow particle size distribution width can be generated. Therefore, the atmosphere or the object can be effectively humidified or cooled without adjusting the spray distance. In addition, by using a single fluid nozzle, the energy consumption of the nozzle device can be reduced and the device can be made compact.

FIG. 1 is a schematic cross-sectional perspective view showing a nozzle device of the present invention. FIG. 2 is a schematic perspective view showing another nozzle device of the present invention. FIG. 3 is a schematic perspective view showing still another nozzle device of the present invention. FIG. 4 is a schematic sectional view showing an example of the nozzle of the nozzle device of the present invention. 5 is a schematic cross-sectional view taken along line VV in FIG. FIG. 6 is an enlarged schematic cross-sectional view showing the flow path at the nozzle tip of FIG. FIG. 7 is a graph showing the results of Example 1.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings as necessary.

  FIG. 1 is a schematic cross-sectional perspective view showing a nozzle device of the present invention. The nozzle device of this example includes a one-fluid nozzle 1 having a spray hole 2 for discharging a pressurized liquid (for example, pressurized water) and spraying a droplet (for example, a mist of water droplets) in a conical shape, and the nozzle A wall 3 for mounting the liquid, and allows passage of droplets (for example, water droplets) in the spray inner area of the spray flow in the vicinity of the spray hole 2 mounted on the wall, and the spray outer peripheral area And a separation unit 4 for separating liquid droplets (for example, mist of water droplets).

  The separation unit 4 has a configuration in which the spray hole 2 faces in the spraying direction in a cylindrical sealed space (a state in which it is directed to a region (passing region) that allows the passage of droplets in the spray inner region). It is attached to the wall 3. That is, the separation unit 4 includes a cylindrical hollow cylinder 5 extending in the forward direction (or the spraying direction) from the wall 3 with the spray hole 2 as a central axis, and a predetermined interval H from the spray hole 2 (this) In the example, a separation plate (separation plate) 7 that is separated from 1 to 3 cm) and is opposed to the spray hole 2 and an opening (or a ventilation portion) 8 formed in the separation plate are provided. Yes. The separation plate 7 has an outer diameter d1 larger than the spray area (or spray diameter) of the spray flow F extending conically from the spray hole 2, and the opening 8 is on the spray center (axis) line. And has an inner diameter d2 smaller than the outer diameter of the spray area. In addition, a porous body or absorbent body 9 formed of a nonwoven fabric or the like and capable of absorbing droplets is attached to the inner surface (side surface on the spray hole side) of the separation plate 7.

  The cylindrical cylinder 5 in front of the separation plate 7 forms a cylindrical hood 5a extending in the spraying direction, can function as a windproof cover, and maintains a stable sprayed state. In addition, a passage (discharge port) 10 leading to the discharge pump is provided below the separation plate 7 of the cylindrical tube body 5 in order to collect water drops that are separated by the separation plate and dropped from the porous body or the absorber 9. Is formed.

  In such a separation unit 4, the opening (or ventilation portion) 8 of the separation plate 7 forms a region (passage region) that allows the passage of droplets (for example, water droplet mist) in the spray inner region, and separates them. The portion of the plate 7 excluding the opening 8 separates (or removes) the droplets by restricting the passage of droplets (for example, water droplet mist) in the outer peripheral area of the spray. That is, coarse droplets exist in the outer peripheral region of the conical spray region (or spray flow F) from the spray hole, and there are almost no coarse droplets in the inner region, and fine droplets occupy. Therefore, the coarse droplets in the outer peripheral region collide with the separation plate 7 and are separated (or removed) from the fine droplets in the inner region (or the central region). In addition, fine droplets in the inner region (or the central region, the region surrounded by d2) containing substantially or almost no coarse droplets can be sprayed through the opening 8, and the latent heat of the minute droplets is utilized. Can humidify or cool the atmosphere. In addition, since the hood 5a extends from the separation unit 4, the spray airflow is not disturbed by external factors such as wind, and the spraying (or evaporation) of the droplets and the latent heat of evaporation are used for spraying. The atmosphere or space of the area can be humidified or cooled.

  The nozzle device is not limited to a single nozzle, and may include a plurality of nozzles. FIG. 2 is a schematic perspective view showing another nozzle device of the present invention. In this example, a plurality of nozzles 1 are arranged at predetermined intervals, and each nozzle 1 is partitioned or isolated in a compartment shape, and is independently arranged in a sealed space.

  More specifically, in this nozzle device, a plurality of nozzles 1 are mounted on the plate-like wall portion 13 at a predetermined interval, and the plate-like wall portion 13 is composed of a plurality of rectangular frame-like boxes. 14 is mounted. In the separation unit 14, a long and narrow space is formed by a bottom plate 15 a, a top plate (not shown), and both side plates 15 b, and this space is partitioned by a plurality of partition plates 16 into square frame-shaped boxes. Further, a separation plate (separation plate) 17 is attached to the front portion of the square frame-shaped box at a predetermined interval from the spray hole 2 to form a closed space of a small room (or compartment). In each sealed space, the spray hole 2 of each nozzle 1 faces the separation plate (separation plate) 17 and faces forward, and the separation plate (separation plate) 17 has a spray center of the spray hole 2. A circular opening 18 is formed around the line (or axis). In addition, a passage (discharge port) 20 leading to the discharge pump is formed in the lower part of the partition plate in order to collect the dropped water droplets.

  Even in such a nozzle device, the spray flow F can be sprayed in a conical shape from the spray hole 2 of each nozzle 1, and droplets in which coarse droplets are mixed in the outer peripheral area of the spray flow F are separated by the separation plates 17. The atomized flow of fine droplets can be sprayed through the opening 18. Moreover, since the spray flow F from the spray holes 2 of each nozzle 1 is partitioned by the side plates 15b and the partition plate 16, the spray flows F do not interfere with each other. Therefore, even if a plurality of nozzles are arranged in parallel, adjacent spray flows F do not merge with each other to form coarse droplets, and a wide range can be uniformly humidified or cooled.

  The separation unit only needs to allow the passage of droplets in the inner spray area in the vicinity of the spray hole and separate the droplets in the outer peripheral area of the spray. It is not always necessary that the region (or the passing region) that allows the opening is open throughout. FIG. 3 is a schematic perspective view showing still another nozzle device of the present invention.

  In this example, the nozzle device has the same structure as that shown in FIG. 1 or 2 except that the passage region of the separation plate 27 is formed by a mesh member (or mesh-like ventilation member) 28. . The conical spray flow F is separated from the spray hole 2 of the nozzle 1 mounted on the wall 23 in a state surrounded by a bottom plate 25a, a top plate (not shown), and both side plates 25b and 25b. 27 is sprayed. Reference numeral 30 denotes a passage (discharge port).

  When the passage region is formed by such a mesh member 28, even if coarse droplets are mixed, coarse droplets (or droplets containing coarse droplets) can be removed by contact with the mesh member 28. Furthermore, even if coarse droplets are not mixed, relatively large droplets can be removed from the inner droplets of the spray flow F, and smaller droplets can be sprayed.

  In addition, the opening diameter (mesh diameter) of the mesh member should just be able to pass the droplet of the spray inner area, for example, can be selected from the range of about 0.1-10 mm, Usually, 0.3-2 mm, Preferably, it may be about 0.5 to 1.5 mm.

  The nozzle is not particularly limited as long as the pressurized liquid can be ejected from the spray holes to spray droplets in the form of a spindle, and the structure of the nozzle is not particularly limited, and may be either a one-fluid nozzle or a two-fluid nozzle. However, the present invention is preferably applied to a one-fluid nozzle in which relatively coarse droplets tend to be distributed in the outer peripheral area of the spray. The structure of the one fluid nozzle is not particularly limited. The nozzle usually sprays fine droplets at a small flow rate. 4 is a schematic cross-sectional view showing an example of the nozzle of the nozzle device of the present invention, FIG. 5 is a schematic cross-sectional view taken along line VV of FIG. 4, and FIG. 6 shows a flow path at the nozzle tip of FIG. It is an expansion schematic sectional drawing.

  The nozzle includes a nozzle body 31 having a mounting portion (a thread portion on the upstream outer peripheral portion in the illustrated example) 31a, a flow path formed along the central axis of the nozzle body, and the flow path. A check valve disposed therein, a swirling flow generating means (swirl flow generating element) for generating a swirling flow formed downstream of the check valve, and a downstream of the swirling flow generating means. And a spray hole for spraying the swirl flow.

  The flow path of the nozzle body 31 is formed at an inflow path (in this example, a cylindrical flow path) 32 (32a, 32b) formed upstream of the nozzle body 31, and at the downstream end of the inflow path. A conical inclined wall (in this example, an inclined wall whose diameter is narrowed toward the upstream direction, or a conical channel wall) 33 and a conical contact member (in this example, in the upstream direction) that can contact the inclined wall. A contact member 34 having an inclined wall whose diameter narrows toward the surface), a storage passage 35 formed downstream of the contact member, and a contact member 34 disposed in the storage passage and attached in the upstream direction. A spring member 36 for biasing, a locking member 37 for locking the spring member at the downstream end of the accommodating flow path 35, and a downstream diameter of the locking member formed downstream of the locking member. Inclined channel (or conical channel) 38 and the wall surface of the inclined channel A swirling groove 39 formed to swirl fluid from the upstream, a ring-shaped groove 40 connected to the downstream end of the swirling groove, and a spray hole formed in the downstream end of the nozzle body 31 connected to the ring-shaped groove. (Orifice) 41. In addition, the inflow channel may be narrowed stepwise or continuously from the upstream side toward the downstream side. In this example, the inflow channel 32 is formed at the upstream large first inflow channel 32a and the downstream end of the first inflow channel, and the channel diameter is larger than that of the first inflow channel 32a. Is constituted by a small second inflow channel 32b. In this example, the spring member (biasing member) 36 is integrated with the contact member 34 and is housed in a cap-shaped casing 34 a that can reciprocate in the axial direction in the housing flow path 35. Further, in this example, two swivel grooves 39 are formed along the axial direction away from the axis of the nozzle body 31.

  In addition, as a one fluid nozzle, the various nozzles utilized for humidification or cooling, for example, the spray nozzle of the said patent document 1, etc. may be sufficient. For example, the spray nozzle has a substantially cylindrical nozzle body, an inflow channel along the central axis of the nozzle body, a smaller diameter than the inflow channel, and a ball receiving portion at the downstream end. A passage, formed on the downstream side of the small-diameter passage and larger in diameter than the small-diameter passage, is attached to the ball receiving portion by an accommodation passage for accommodating the check valve, and a spring member of the check valve. An energized ball, a projection (or rib) formed at the downstream end of the accommodation channel and having a small diameter channel capable of locking the check valve, and a tube formed downstream of the projection And a reciprocating member (or piece) capable of reciprocating in the axial direction within the cylindrical flow passage, and a spiral or curved surface formed on the outer peripheral surface of the reciprocating member to generate a swirling flow , A conical channel formed with a narrowed channel diameter downstream of the cylindrical channel, and a spray connected to the tip of the conical channel It may comprise (orifice) and.

  In the nozzle, the urging member is not necessarily required, but it is preferable to include a check valve provided with the urging member for spraying according to the pressure of the liquid. Further, a flow path (swirl groove or the like) for giving a swirling flow is not necessarily required, and the form of the groove for giving the swirling flow is not particularly limited, and is parallel or intersects with the axial direction of the nozzle body. It may be formed in a curved shape or a spiral shape.

  The nozzle orifice diameter (minimum nozzle diameter) is, for example, 0.05 to 1 mm (for example, 0.06 to 0.8 mm), preferably 0.07 to 0.5 mm (for example, 0.08 to 0.4 mm). ), More preferably 0.08 to 0.35 mm (for example, 0.1 to 0.3 mm), particularly 0.12 to 0.25 mm).

  The pressure may be, for example, about 2 to 25 MPa (for example, 3 to 20 MPa), preferably 3 to 15 MPa, and more preferably about 4 to 10 MPa (for example, 5 to 10 MPa).

  Furthermore, the flow rate of the liquid is 10 to 300 ml / min (for example, 20 to 250 ml / min), preferably 30 to 200 ml / min (for example, 40 to 150 ml / min), more preferably about 40 to 100 ml / min. Also good.

  The shape of the spray flow from the spray holes (conical spray flow) is not particularly limited, and may be conical, elliptical, or polygonal (such as a quadrangular pyramid or hexagonal pyramid). The shape of the spray flow from the spray hole is usually conical, quadrangular pyramid, and the like in many cases.

  In general, when spraying in a spindle shape with a single fluid nozzle or a two fluid nozzle, relatively large droplets tend to be distributed on the outer periphery of the spray. In particular, the tendency of the one-fluid nozzle is strong. Focusing on this point, the present invention separates and removes the droplets at the outer periphery of the spray or at the outer periphery. The separation unit locates a region (passing region) that allows the passage of droplets in the inner area of the spray at a position separated from the spray hole by a predetermined distance, and drops the liquid in the outer peripheral region of the spray (a liquid containing coarse droplets). In general, the distance H between the spray hole and the separation portion (the portion separating the droplets in the outer peripheral area of the spray (droplets including coarse droplets)) is, for example, 0.5 to It may be about 25 cm (for example, 0.8 to 20 cm), preferably 1 to 15 cm (for example, 1.2 to 12 cm), and more preferably about 1.5 to 10 cm (for example, 1.5 to 5 cm). As will be apparent from the examples described later, coarse droplets are mixed in the outer peripheral area of the spray flow, and there are no coarse droplets in the inner area (or the central area), and the liquid has a very small diameter. There are only drops. In addition, the droplet diameter of the spray flow is such that the droplets coalesce / grow as they move away from the spray hole (eg, coalescence / growth associated with mixing of droplets in the outer peripheral area and fine liquid droplets in the inner area). Probably because of this, coarse droplets are generated, and these coarse droplets cannot be removed without using a complicated device such as an eliminator. On the other hand, if the coarse droplets in the outer peripheral area of the spray flow are separated in the vicinity of the spray holes, the spray flow of fine droplets can be maintained even if the droplets are moved away from the spray holes.

  The Dv99 of the droplet passing through the passage region (opening or the like) of the separation unit may be about 50 μm or less, preferably about 40 μm or less, more preferably about 30 μm or less, especially about 20 μm or less. Moreover, it is preferable that the spray flow that has passed through the passage region (opening or the like) does not substantially contain coarse droplets exceeding Dv99 = 50 μm.

  The particle diameter (or droplet diameter) of the spray liquid can be measured by a conventional method, for example, a method using a laser beam, a method using a strobe, a method using a micrograph. In addition, since the particle diameter of a liquid is polydispersity, it is usually expressed by an average particle diameter in many cases. As the average particle size, an arithmetic average particle size, a Sauter average particle size, and the like are known. In the present invention, the Sauter average particle diameter (D32) of the spray liquid is 1 to 35 μm (for example, 2 to 30 μm), preferably 2 to 25 μm (for example, 3 to 20 μm), more preferably 4 to 15 μm at the spray center. (For example, 5 to 12 μm), particularly about 4 to 10 μm (for example, 5 to 8 μm). The Sauter average particle diameter (D32) is a ratio of the sum of the volume of the droplets in the sample to the sum of the surface areas, and is calculated by the following formula.

Sauter average particle diameter (D32) = Σdi ³ ni / Σdi ² ni
(Wherein di represents the particle size of component i, and ni represents the number of particles of component i of particle size di).

  The average flow velocity of the spray flow can be selected, for example, from a range of about 0.1 to 20 m / s, and is usually 0.5 to 15 m / s (for example, 1 to 12 m / s), preferably 1.2 to 10 m / s. It may be about s (for example, 1.5 to 8 m / s).

  In the separation unit, the portion for separating / removing the droplets in the outer peripheral area of the spray (the separation plate) allows the passage of the droplets in the inner area of the spray (the separation plate) to have an inner diameter smaller than the outer diameter of the spray area. A region (passage region), an opening portion that may be mesh-shaped), and the passage region (for example, the opening portion) may be displaced from the center of the spray center (axis) line. However, in order to efficiently remove coarse droplets in the outer peripheral area of the spray, the central portion is usually located on the spray center (axis) line. The shape of the passage region (for example, the opening) may be different from the cross-sectional shape of the spray flow from the discharge port, but the passage region (for example, the opening) of the passage region (for example, the opening) corresponds to the cross-sectional shape of the spray flow. It is preferable to form a shape (for example, a circular opening for a conical spray, a square opening for a quadrilateral cone spray, etc.). In particular, when the central portion of the passage region (for example, the opening) is positioned on the spray center (axial) line, the droplets in the spray outer peripheral region can be evenly separated throughout.

  The diameter d2 of a region allowing passage of droplets in the spray inner region or a pass region (for example, an opening that may be mesh-shaped) is a spray diameter of the spray flow (outer diameter in the pass region) d1. It may be selected from the range of about 10 to 95%, and may be usually 20 to 90% (for example, 25 to 85%), preferably 30 to 80%, and more preferably about 35 to 70%. When the cross-sectional shape of the spray flow is an anisotropic shape such as an ellipse or a polygon, the diameter d2 of the passage region and the spray diameter d1 of the spray flow are the average of the major axis and the minor axis from the center. It means the average value of the value and the distance from the center to each side.

  In the separation unit, a cylinder such as a hollow cylindrical cylinder is not necessarily required, and the separation plate is arranged at a predetermined interval with respect to the spray hole of the nozzle without surrounding the spray flow with the cylinder or the like. Also good. As described above, the spray flow may be directly sprayed from the spray hole to the open system. However, in order to improve the removal efficiency of the coarse droplet, the inside of the space covering the spray flow from the spray hole (for example, the cylindrical shape) It is preferable to remove coarse droplets in space). That is, it is preferable to arrange the nozzle and the separation unit in the sealed space in a state where the spray hole faces (or faces) the passage region (for example, the opening) of the separation unit, and the passage region (for example, (Except for the opening), the spray flow is covered or surrounded by a cylinder or a frame to form a sealed or closed space (box-shaped space). In other words, in order to effectively remove and separate coarse droplets from the spray-like spray flow from the nozzle spray hole, the space from the nozzle spray hole to the separation site (placement site of the separation plate) is hollow. It is preferable to form a sealed space (sealed form space) except for a flow area (opening or the like) that allows the passage of liquid droplets in the spray inner area by covering with a cylinder. The cross-sectional shape of the hollow cylinder is not limited to the circular shape, and may be an elliptical shape or a polygonal shape (triangle, square, pentagon, hexagon, etc.). In many cases, the cross-sectional shape of the hollow cylinder is usually a circular shape, an elliptical shape, a quadrangular shape, or the like.

  As described above, the separation unit may be configured by a separation plate facing the spray hole at a predetermined interval, but usually, the spray hole is exposed and covers (or surrounds) the spray hole. A hollow cylinder extending in the spray direction and a separation plate disposed in the cylinder and facing the spray hole with a predetermined interval are provided.

  In a nozzle device having a plurality of nozzles, the nozzles may be arranged at predetermined intervals in the vertical and horizontal directions, or may be arranged at predetermined intervals in the vertical and horizontal directions. Furthermore, you may make it produce | generate the spray flow from the spray hole of each nozzle independently in a hollow cylinder (or box), respectively.

  A hood (windproof cover) extending from the separation unit in the spraying direction (forward direction) is not necessarily required, but by forming the hood, the spray flow can be sprayed without disturbing the flow.

  Furthermore, in the nozzle device used for humidification and cooling, since the flow rate of liquid is small and the separation unit is not excessively wetted, the inner surface of the separation unit (separation plate, etc.) (the inner surface facing the spray hole) The attached porous body or absorbent body is not always necessary, but if necessary, a porous body or absorbent body capable of absorbing droplets may be attached to the inner surface of the separation unit. The porous body and the absorbent body are not limited to non-woven fabric but may be woven fabric, sponge, or the like. Further, the separation unit may be formed of a sheet or board-like porous body or absorbent body in which an opening is formed instead of the separation plate.

  Furthermore, a passage (guide channel) for collecting droplets separated by the separation unit is not necessarily required, but by forming the passage (guide channel), even if the separation unit is excessively wetted, Dropping of droplets can be suppressed. This passage (guide channel) may lead to the discharge drain or may lead to the discharge pump of the nozzle device.

  A spray stream can be sprayed in various directions from the spray hole, and the spray stream may be sprayed in an upward direction, an obliquely upward direction, a lateral direction, an obliquely downward direction, a downward direction, etc., and these spray streams are combined (for example, , In both downward and lateral directions).

  In addition, although the kind of liquid can be selected according to a use and may be an organic solvent, the humidification (or humidity control) using volatilization of mist, the cooling of the atmosphere or space using the latent heat of vaporization of liquid, Usually water is used.

  As described above, in the present invention, the pressurized liquid is sprayed in the form of a weight from the spray hole of the nozzle, the liquid droplets in the inner spray area are allowed to pass near the spray holes, and the liquid droplets in the outer peripheral area of the spray are used. A separation unit is provided for separating the atmosphere, and the atmosphere or space can be effectively humidified or cooled by utilizing the fine droplets that have passed through the droplet passage region of the separation unit. Therefore, the present invention is useful as a method for humidifying or cooling an atmosphere or space by utilizing volatilization (or evaporation) of fine or fine droplets and latent heat of evaporation.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. The droplet diameter (particle diameter) and flow velocity were measured as follows.

  The particle size and flow velocity of the droplet (or spray liquid) are 2 in the spray liquid using a phase Doppler laser particle analyzer or particle size measuring device (TSI, PDPA device “FSA4000 / 4W water-cooled Ar laser”). Measurement was performed by irradiating a laser beam. The intersection of the two lasers was used as a measurement point.

  The particle diameter and flow rate of the droplets were measured at a position 120 mm from the discharge hole in the center of the spray (measured particle number: 10,000). Further, the Sauter average particle size was calculated from the obtained particle size data (particle size distribution) by the Sauter average method.

Example 1
Using a nozzle with an orifice diameter of 0.2 mm, water is pressurized at a water flow rate of 50 ml / min, a water pressure (spray pressure) of 6 MPa and a spray angle of 80 °, and sprayed in a conical shape downward from the spray hole. The relationship between the distance (spray distance or spray height) H and the distance L from the spray center and the particle diameter was examined using a phase Doppler laser particle analyzer (PDPA). The outer diameter of the conical spray flow at a spray distance H of 100 mm was about 120 mmφ. Sauter average droplet diameter (D32) and Dv99 were measured. The results are shown in Table 1 and FIG. In FIG. 7, together with the data of conditions E, F, G, and H in Table 1, the relationship between the particle diameter (μm) and the number of counts in condition I (spray distance H = 1200 mm, distance L = 0 cm from the spray center) is shown. Show.

  As is clear from Table 1, when the spray distance H is 300 mm or more, water droplets having a large droplet diameter are mixed, and when the distance L from the spray center is 20 mm or more, water droplets having a large droplet diameter are mixed and cooled. Gives a wet feeling, not a feeling.

Example 2
Using a nozzle with an orifice diameter of 0.2 mm, water is pressurized at a water flow rate of 50 ml / min, a water pressure (spray pressure) of 6 MPa and a spray angle of 80 °, and sprayed in a conical shape downward from the spray hole. The droplet size distribution, Dv99, and average flow velocity were measured using a phase Doppler laser particle analyzer (PDPA) at different distances (spray distance or spray height) H and distance L from the spray center. . In addition, the said characteristic was measured by the presence or absence of the separation unit provided with the separation plate. The separation unit is formed of a square frame box with sides of 50 mm, and includes a separation plate in which an opening with an inner diameter of 10 mmφ is formed on the spray center line of the nozzle in front of 20 mm from the spray hole of the nozzle. Further, the outer diameter of the conical spray flow at the position of the separation plate was about 30 mmφ.

  As is clear from Table 2, by disposing the separation unit (separation plate), it is possible to suppress an increase in the droplet diameter even when the spray distance H is increased. Therefore, it is useful for humidifying and cooling the atmosphere. In particular, refreshing cold air can be efficiently generated in hot summer.

  Although the present invention has a simple and compact structure, it is possible to remove coarse droplets and spray a spray flow of fine droplets. For this reason, the atmosphere or space can be efficiently cooled by utilizing the volatilization or evaporation of the fine droplets, and the atmosphere or space can be efficiently cooled (or cooled) by utilizing the latent heat of vaporization of the fine droplets. Therefore, it is useful as a humidifying or cooling nozzle device (or a humidifying or cooling method) for cooling (decreasing the temperature) or humidifying the space in the spray area during drying (such as in winter) and high temperatures (such as in summer).

DESCRIPTION OF SYMBOLS 1 ... Nozzle 2 ... Spray hole 4,14 ... Separation unit 5 ... Cylindrical body 7,17 ... Separation plate 8,18 ... Opening part 9 ... Porous body or absorber 10,20 ... Passage 28 ... Mesh member

Claims (11)

  A device equipped with a nozzle for ejecting pressurized liquid from a spray hole to spray droplets in a spindle shape, allowing the passage of droplets in the inner area of the spray in the vicinity of the spray hole, and spraying A nozzle device comprising a separation unit for separating droplets in the outer peripheral area.   The nozzle device according to claim 1, wherein the nozzle is a one-fluid nozzle.   The nozzle device according to claim 1 or 2, wherein the separation unit includes an opening having a central portion located on a spray center (axis) line and having an inner diameter smaller than an outer diameter of the spray zone.   The separation unit is disposed on a spray center line 0.5 to 25 cm away from the spray hole, with a region allowing the passage of droplets in the spray inner region being located. The nozzle device described.   The nozzle device according to any one of claims 1 to 4, wherein the separation unit allows passage of droplets having a particle size Dv99 corresponding to 99% of the cumulative particle size curve of 50 µm or less.   The nozzle device according to any one of claims 1 to 5, wherein a porous body or an absorber capable of absorbing droplets is attached to the inner surface of the separation unit.   7. The nozzle and the separation unit are arranged in a state where the spray hole faces the region of the separation unit that allows the passage of droplets in the spray inner region in the sealed space. Nozzle device according to.   The nozzle device according to claim 1, wherein a passage for collecting the separated droplets is formed.   The nozzle device according to any one of claims 1 to 8, wherein a hood extends from the separation unit in a spraying direction.   The nozzle device according to any one of claims 1 to 9, wherein a region of the separation unit that allows passage of droplets in a spray inner region is formed in a mesh shape.   A method for spraying pressurized liquid from a spray hole of a nozzle in a spindle shape to humidify or cool the liquid, allowing the passage of droplets in the inner area of the spray in the vicinity of the spray hole, and in the outer peripheral area of the spray. A method in which a separation unit for separating droplets is provided and humidified or cooled by microdroplets.

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