JP3898464B2 - Slit nozzle for liquid film generation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slit nozzle, and more particularly to a slit nozzle that generates a substantially plate-like liquid film used for cooling a rolled steel sheet or cleaning a printed circuit board.
[0002]
[Prior art]
As this type of nozzle, when cooling a rolled steel sheet derived at a high temperature, it is usual to use a laminar nozzle that generates a cylindrical water flow, but the cylindrical water flow itself is a partial amount of water. A uniform and averaged cooling effect was not obtained. Therefore, as shown in FIG. 6, a substantially cylindrical nozzle main body 11 having a double structure of an inner pipe and an outer pipe is used for cooling and cleaning from the water supply port 11 a at one axial end of the inner pipe to the inside of the main body. Water or liquid (hereinafter simply referred to as liquid) was supplied, and it protruded outward from the outer pipe through the gap around the inner pipe from the outlet arranged in the longitudinal direction of the inner pipe, and extended in the longitudinal direction of the outer pipe. A slit nozzle has also been proposed in which a liquid guided to a slit-like discharge port provided at the tip of a flat-plate-like discharge part 11b generates a plate-like liquid film.
[0003]
[Problems to be solved by the invention]
However, even in the case of the conventional slit nozzle described above, a contracted flow caused by the surface tension is generated particularly in the liquid passing through the flat discharge portion, and the liquid film is formed in the middle of the longitudinal direction of the liquid film discharged from the slit. There is a problem that the phenomenon of interruption occurs, and the produced liquid film still cannot obtain an average cooling effect and cleaning effect at an average flow rate.
[0004]
Therefore, the object of the present invention is to overcome the above-mentioned problems, and in the longitudinal direction of the generated liquid film, the flow rate distribution is uniform over the entire longitudinal direction of the slit-like discharge port without causing any interruption in the liquid film due to the contraction flow. The object is to provide a slit nozzle capable of generating a liquid film.
[0005]
[Means for Solving the Problems]
According to the present invention, the above object is to provide a liquid supply port and an inner tube having a plurality of outflow holes arranged in the longitudinal direction, and a liquid outflow disposed in the longitudinal direction while surrounding the inner tube by providing a gap in the inner pipe circumferential surface. a main body portion made of an outer tube having an opening, protrude from outer tube along the liquid outflow opening of the outer tube substantially connecting the inlet end of the plate-shaped internal channel to the outer tube longitudinal direction of the main body portion flow path In a liquid film generating slit nozzle having a nozzle portion having a slit-like discharge port at the tip, the slit nozzle is further interposed between the outer tube and the nozzle portion of the main body portion to surround the liquid outflow opening of the outer tube. The liquid reservoir has a bottom surface of the liquid reservoir that is connected to the inflow end of the nozzle portion with a width in a direction crossing the substantially plate-shaped flow path in the nozzle portion larger than the width of the inflow end of the nozzle portion. Is substantially parallel to the longitudinal direction of the nozzle inflow end along the longitudinal direction of the main body. It is achieved by the slit nozzle and forming a rectifying plate having a plurality of rows of flow straightening apertures arrayed.
[0006]
[Action]
By adopting the above-described configuration, in the slit nozzle according to the present invention, the liquid guided from the inside of the inner tube of the main body to the gap between the inner tube and the outer tube is temporarily supplied from the liquid outflow opening of the outer tube to the liquid reservoir. The liquid is stored and supplied to the nozzle part in a state of being rectified by the rectifying hole of the rectifying plate of the liquid reservoir while preventing turbulent flow and contraction that may occur in the longitudinal direction of the nozzle in the liquid reservoir. Therefore, the liquid film discharged from the slit-like discharge port of the nozzle portion generates a liquid film having a substantially uniform flow rate in the longitudinal direction.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
【Example】
Referring to FIGS. 1 to 8, the slit nozzle according to the present invention has a liquid supply port 1a at one end in the axial direction in this case, and a plurality of liquid outflow holes 1b arranged along the axial direction at a part of the peripheral surface. The inner tube 1 having the inner tube 1 and the inner tube 1 are surrounded and separated from the outer peripheral surface of the inner tube to form a gap, and preferably disposed along the axial direction on the opposite side of the inner tube from the liquid outflow hole 1b. A substantially cylindrical main body is formed by the outer tube 2 having the liquid outflow opening 2a. A liquid reservoir that has a substantially elongated plate shape, has a substantially plate-like flow channel inside, and has a slit-like discharge port 4a at the tip of the flow channel, which is a remarkable feature of the present invention. 3 is attached to the liquid outflow opening 2a portion of the main body outer tube.
[0008]
2 is a cut end view taken along the line AA in FIG. 1, FIG. 4 is an enlarged bottom view, and FIG. 5 is an enlarged partial cut end view taken along the line BB in FIG. As is apparent, it has an elongated box shape with an upper surface as an opening, and is attached to the outer tube 2 on the upper surface of the opening so as to surround the liquid outflow opening 2a of the main body outer tube 2. The bottom surface of the liquid reservoir 3 facing the top surface of the opening forms a rectifying plate 3a having rectifying holes 3b arranged in two rows along the longitudinal direction in this case, and the liquid flowing out from the liquid outflow opening 2a of the main body outer tube 2 Once stays in the liquid reservoir 3 and is compressed substantially uniformly during that time, then rectified and discharged from the rectifying hole 3b.
[0009]
The nozzle part 4 is attached to the current plate 3a of the liquid reservoir part 3 on the inflow end side of the substantially plate-like flow path partitioned inside thereof and enlarged in the width direction across the longitudinal direction. The tip having the slit-like discharge port 4a with a reduced width is directed in a direction away from the main body. If a flow straight plate or grid-like flow straightening plate 4b as seen from the inflow end as shown in FIG. 7 is arranged in the flow path of the nozzle portion 4 along the flow path longitudinal direction, a further desirable flow straightening effect can be obtained.
[0010]
The liquid supplied into the inner pipe 1 of the main body flows in the longitudinal direction of the inner pipe 1 and is led out from the liquid outflow hole 1b along the longitudinal direction to the gap between the inner and outer pipes. Since the flow rate of the supplied liquid varies depending on the diameter of the liquid outflow hole 1b, the diameter of the liquid outflow hole 1b is set according to a desired liquid film flow rate. At the same time, since the pressure distribution in the longitudinal direction of the inner pipe of the liquid supplied into the inner pipe changes according to the distance from the liquid supply port 1a, it is desirable to gradually decrease the diameter or area of the liquid outflow hole 1b as the distance increases. Thus, if the pressure distribution in the longitudinal direction of the nozzle of the liquid supplied to the liquid reservoir 3 is substantially uniformized, the longitudinal flow rate of the liquid film to be generated is further uniformized.
[0011]
In order to make the liquid film flow rate uniform, the liquid outflow opening 2a of the outer tube 2 is further divided into two rows parallel to a number of round holes along the longitudinal direction of the outer tube as illustrated in FIG. Are arranged at equal intervals and are shifted by a half pitch with respect to adjacent other rows. The axis of the holes in each row is inclined outward by about 10 degrees with respect to the plane passing through the center line between both rows and the outer tube axis. On the other hand, the rectifying holes 3b of the liquid reservoir 3 are formed as elongated holes extending in the longitudinal direction of each row as illustrated in FIG. 4, and a certain amount of liquid flows out from the liquid outlet 2a of the main body outer tube. It is diffused and sent to the rectifying hole 3a, and the rectifying effect is enhanced.
[0012]
Further, in the present invention, as shown in FIG. 9, at least a part of the outflow hole 1b to be formed in the central portion of the inner tube 1 of the main body portion is omitted. In this case, generally, in the slit nozzle, the discharge amount at the central portion of the inner tube 1 tends to increase, but the increase in the discharge amount at the central portion is minute relative to the ratio of the total supply amount increase. Usually there is no problem. On the other hand, when a high water amount distribution performance is required in the entire width direction of the slit, the ratio of the discharge amount at the center portion tends to increase. Therefore, since the outflow hole 1b in the center is reduced, an increase in the discharge amount in the center can be suppressed. Accordingly, as shown in FIG. 10, the discharge amount was measured from the nozzle portion 4 of the slit nozzle by the water amount distribution measuring device 10, and as a result, a substantially uniform discharge amount was obtained throughout. In addition, the other structure in embodiment of FIG. 9 is the same as that of embodiment mentioned above, and can obtain the same effect | action.
[0013]
Furthermore, in the present invention, as shown in FIGS. 11 and 12, an adjustment block 4 c having a rounded surface is disposed at each outflow end in the longitudinal direction at the slit-like discharge port 4 a of the nozzle portion 4. In detail, the width of the liquid film discharged from the slit-like discharge port 4a can be adjusted by arranging a block at each outflow end in the longitudinal direction of the slit-like discharge port 4a. Simply by inserting the block, the discharge of the liquid film from the slit-like discharge port 4a is not uniform in the longitudinal direction. At this time, by disposing the adjustment block 4c having a rounded surface, the discharge of the liquid film from the slit-like discharge port 4a can be made substantially uniform in the longitudinal direction.
[0014]
The rounded surface of the adjustment block 4c has a roundness of R = 0.2 to 0.9T, preferably 0.4 to 0.7T. Here, T is the thickness in the width direction of the slit-like discharge port 4a of the adjustment block 4c (see FIG. 11).
[0015]
【The invention's effect】
According to the slit nozzle for generating a liquid film of the present invention configured as described above, the flow rate of the liquid in the generated liquid film, in particular in the longitudinal direction, is uniformed, and cooling of a high-temperature rolled steel sheet or printed circuit board When used for cleaning or the like, a uniform cooling effect and cleaning effect in the width direction of the steel plate or substrate can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing a cross section of a part of a slit nozzle for producing a liquid film according to the present invention.
FIG. 2 is a cross-sectional view of the slit nozzle at the cut end surface along the line AA in FIG. 1;
FIG. 3 is a bottom view of the slit nozzle of FIG. 1;
4 is a bottom view of a liquid reservoir of the slit nozzle of FIG. 1. FIG.
5 is a partially enlarged cross-sectional view of a liquid reservoir portion along line BB in FIG. 4 and a main body portion adjacent thereto.
FIG. 6 is a simplified perspective view showing a conventional example of a slit nozzle.
7 is an enlarged perspective view of a part of a rectifying plate disposed in a nozzle portion flow path of the slit nozzle of FIGS. 1 to 5. FIG.
FIG. 8 is a partially enlarged bottom view of the outer tube of the main body.
FIG. 9 is a simplified illustration of another embodiment of a slit nozzle for producing a liquid film according to the present invention.
FIG. 10 is an operation explanatory view of the slit nozzle of FIG. 9;
FIG. 11 is a side view showing a part of another embodiment of the present invention in cross section.
12 is a partially enlarged view of the embodiment of FIG. 11. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body inner pipe 1a Liquid supply port 1b Liquid outflow hole 2 Main body outer tube 2a Liquid outflow opening 3 Liquid reservoir 3a Current plate 3b Current flow hole 4 Nozzle part 4a Slit-like discharge port 4b Current flow plate 4c Adjustment block 10 Water quantity distribution measuring device

Claims (4)

An inner tube having a liquid supply port and a plurality of outflow holes arranged in the longitudinal direction, and a main body portion comprising an outer tube having a liquid outflow opening disposed in the longitudinal direction and surrounding the inner tube by providing a gap in the circumferential surface of the inner tube A nozzle part having an inflow end of a substantially plate-like internal flow path connected to a liquid outflow opening of the outer pipe of the main body part, protruding from the outer pipe along the longitudinal direction of the outer pipe, and having the flow path tip as a slit-like discharge port In a slit nozzle for generating a liquid film comprising:
The slit nozzle further includes a liquid reservoir that is interposed between the outer tube of the main body and the nozzle portion and surrounds the liquid outlet opening of the outer tube, and the liquid reservoir crosses a substantially plate-like flow path in the nozzle portion. The width of the direction is larger than the width of the inflow end of the nozzle portion, and the bottom surface of the liquid reservoir connected to the inflow end of the nozzle portion is substantially parallel to the longitudinal direction of the nozzle portion inflow end along the longitudinal direction of the main body portion. A slit nozzle characterized by forming a flow straightening plate having a plurality of rows of flow straightening holes. The liquid outflow opening of the outer tube of the main body portion is composed of a plurality of holes arranged in at least two rows along the longitudinal direction of the outer tube, and each hole is equidistant in each row and pitches with holes in other adjacent rows. The rectifying holes of the liquid reservoir are long holes extending in the longitudinal direction of each row, and the long holes are arranged at equal intervals in each row, and are arranged at a different pitch from the holes in the other adjacent rows. The slit nozzle according to claim 1 . The slit nozzle according to claim 1 or 2, wherein at least a part of an outflow hole provided in a central portion of the inner tube is omitted in the inner tube of the main body. The slit nozzle according to any one of claims 1 to 3, wherein an adjustment block having a rounded surface is disposed at each outflow end in the longitudinal direction of the slit-like discharge port of the nozzle portion.

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