JP4307357B2 - Header and cooling device - Google Patents

Description

  The present invention relates to a header and a cooling device including the header, and more particularly, to a header capable of ejecting a fluid having a uniform flow rate distribution from a slit-shaped nozzle tip, and a cooling device including the header.

  When water-cooling wide high-temperature steel materials, there are other methods of cooling using water in a jet flow or laminar flow state discharged from a slit-like nozzle (hereinafter sometimes referred to as “slit nozzle”). It has a higher cooling capacity than this method. Therefore, a cooling method using a slit jet method or a slit laminar method has been frequently used in controlled cooling of a thick steel plate, a hot-rolled hot run table, and the like. However, recently, for the reason that finer control is required for the cooling of high-temperature steel materials, even in the water-cooling method using a slit nozzle, various methods related to ensuring the cooling rate and cooling uniformity, etc. Problems have been pointed out.

  When the steel plate is controlled and cooled online, it is desired to uniformly cool the steel plate using a cooling device having a high cooling capacity. Therefore, a cooling device having a slit nozzle is used. However, the conventional cooling device has high cooling capacity, but in the width direction of the thick steel plate, the flow rate distribution of the water discharged from the header tends to be non-uniform, and streaky cooling unevenness in the longitudinal direction of the thick steel plate. Is likely to occur. This uneven cooling contributes to variations in mechanical test values within the same steel sheet and causes a reduction in steel sheet quality.Therefore, it is possible to reduce the cooling unevenness by making the flow rate distribution of water discharged from the header uniform. It is desired.

  On the other hand, generally, water is supplied from a plurality of water supply pipes to a header used for water cooling of a high-temperature steel material. Therefore, in the header, it is considered that a pressure gradient of water is generated between a portion located directly below the water supply pipe and a portion other than directly below, and this pressure gradient contributes to the non-uniform flow rate distribution.

Until now, several techniques aimed at reducing the cooling unevenness by a method such as equalizing the cooling water in the header have been disclosed. For example, Patent Literature 1 and Patent Literature 2 disclose a technique that can equalize the cooling water in the header by providing a current plate in the header. According to these techniques, the flow rate distribution in the plate width direction of the steel plate can be made uniform, and therefore the cooling capacity in the plate width direction can be made uniform. On the other hand, Patent Document 3 discloses a technique that can make the flow rate distribution uniform by using a cooling facility including a small-capacity sub-slit laminar flow cooling device.
JP-A-6-182425 Japanese Utility Model Publication No. 5-70711 JP-A-8-39126

  However, in the techniques disclosed in Patent Document 1 and Patent Document 2, it is possible to suppress the pressure gradient of water generated in the header that discharges laminar water, but in the header that injects jet water. There is a problem that it is difficult to suppress the pressure gradient of water generated in the process. In addition, for example, when the flow regulating valve is opened or closed, the pressure fluctuation of the water in the header or nozzle is large at the time of non-steady state. There is a problem that it takes time until the water flow in the header is made to be a stable and uniform flow, leading to a decrease in production efficiency during operation. Furthermore, when the water pressure fluctuation is sufficiently uniformed only by the current plate, there is a problem that the pressure loss tends to increase and it may be difficult to generate the jet flow itself. On the other hand, even with the technique disclosed in Patent Document 3, there is a problem that it is difficult to achieve a uniform flow rate distribution.

  Here, as means for solving the above problems, means such as making the header shape complicated or enlarging the nozzle may be considered, but such means are inferior in machinability and need to produce the header by casting. From the viewpoints of, for example, deterioration in maintainability and an increase in cost.

  Therefore, the present invention provides a header that can be manufactured at a relatively low cost without using a casting operation, has a high fluid ejecting ability and a uniform fluid ejecting ability, and a cooling device including the header. Is an issue.

As a result of diligent research on a header that can be manufactured at a relatively low cost without using a casting operation and has a high cooling ability and a uniform cooling ability, the inventors have obtained the following knowledge. .
1) By providing a conducting fluid in the header, it is possible to suppress pressure fluctuations of the fluid supplied from a plurality of pipes in the header. Therefore, a cooling device provided with such a header can cool a material to be cooled uniformly.
2) By forming a notch in at least one end face of a pair of flanges that form a slit-shaped nozzle tip that ejects fluid, or by forming a tapered end in at least one of the flanges, The flow of fluid ejected from the nozzle tip can be made uniform.
3) By providing the rectifier with a rectifier that suppresses the flow of the fluid toward the longitudinal direction of the guide fluid, it is possible to further suppress the fluid pressure fluctuation in the header.

  The present invention has been made based on such knowledge. The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiments.

The first aspect of the present invention is a header (10) having a slit-like nozzle tip (2) connected to a pipe (20) for supplying a fluid, and is supplied from the pipe (20) to the inside thereof. A fluid (3) for guiding the fluid to the nozzle tip (2) is provided. The nozzle tip (2) is formed by a pair of flanges (4a, 4b) and at least one flange (4a). The above problem is solved by the header (10), characterized in that the flow stabilizing means is provided in 4b).
Here, the fluid is not limited to a liquid such as water, but may be a gas such as air. The fluid guiding fluid (3) is provided to smoothly guide the fluid supplied from the pipe (20) to the nozzle tip (2). If the fluid can be smoothly guided, The form is not particularly limited. Examples of the form of the guiding fluid (3) according to the present invention and the invention described below include a tubular shape, a rod shape, a plate shape, and the like. When the fluid guide (3) is tubular or rod-shaped, specific examples of the cross-sectional shape include a smooth streamline shape such as a circle or an ellipse. On the other hand, when the conducting fluid (3) is plate-shaped, specific examples of the form include an L-shape.
In the present invention and the invention shown below, the fluid (3) can maintain a pressure at which the fluid whose flow is corrected by the fluid (3) can be jetted from the nozzle tip (2). Has been placed. Further, the flow stabilizing means refers to means provided for the purpose of eliminating the negative pressure generated between the fluid ejected from the nozzle tip (2) and the end face (5a, 5b) of the flange. Yes.

In the first aspect of the present invention, the flow stabilizing means includes a notch (6, 6) formed on the flange end surface (5a, 5b) or a tapered end formed on the flange (4a, 4b) ( 5a and 5b) are preferred.
Here, the tapered end portions (5a, 5b) mean tapered end portions (5a, 5b) formed so that the tips of the flange portions (4a, 4b) are narrowed.

Moreover, in the said 1st this invention, it is preferable that the rectification body (7) which suppresses the flow of the fluid which goes to the longitudinal direction of the guide fluid (3) is provided.
Here, the shape of the rectifying body (7) is not particularly limited as long as the flow of the fluid toward the longitudinal direction of the guiding fluid (3) can be suppressed inside the header (10). Absent. Examples of the mode of the rectifying body (7) include a tubular rectifying body having a large number of small holes, a rectifying body partitioned in a lattice shape, and parallel to the fluid flow at regular intervals in the longitudinal direction of the header (10). A plate-like (partition-wall) rectifier provided may be used.

  Furthermore, in the first aspect of the present invention, one of the flanges (4b) is stretched in the ejection direction of the fluid (8) ejected from the nozzle tip, rather than the other (4a) of the flange. Is preferred.

  In addition, in the first aspect of the present invention, it is preferable that a stagnation prevention means (9) for suppressing the flow of fluid toward other than the nozzle tip (2) is provided.

  In the first aspect of the present invention, the stagnation prevention means (9) is preferably a fin that is attached to the fluid guiding fluid (3) and restricts the flow in the direction opposite to the nozzle tip (2).

  2nd this invention solves the said subject with a cooling device provided with the header (10) concerning the said 1st this invention.

  According to 1st this invention, the fluid (3) is provided in the header (10), The fluid by which the flow direction was corrected by the said fluid (3) is the fluid (3) and header ( Since the fluid is guided to the nozzle tip (2) through the space formed by the inner wall of 10), it is possible to suppress the fluid pressure fluctuation that occurs in the longitudinal direction in the header (10). In the first aspect of the present invention, the fluid (3) is disposed so that the fluid whose flow is corrected by the fluid (3) can maintain a pressure at which the fluid can be jetted from the nozzle tip (2). Therefore, the header (10) according to the first aspect of the present invention can have a high fluid ejecting ability. Therefore, according to the first aspect of the present invention, it is possible to provide the header (10) having high fluid ejecting ability and uniform fluid ejecting ability. In addition, since the guiding fluid (3) in the first aspect of the present invention has a relatively simple shape, the header (10) including the guiding fluid (3) is relatively inexpensive without being cast. It is possible to produce.

  In the first aspect of the present invention, the notch (6) is formed in at least one flange end face (5a, 5b), or the at least one flange (4a, 4b) becomes thinner toward the tip. If the tapered end face (5a, 5b) having such a shape is provided, a negative generated between the fluid (8) ejected from the nozzle tip (2) and the flange end face (5a, 5b). The pressure can be easily suppressed. Therefore, it becomes easy to provide the header (10) which can inject a more uniform fluid by setting it as this structure.

In the first aspect of the present invention, if the rectifying body (7) is provided, it is possible to suppress the flow of fluid toward the longitudinal direction of the fluid guide (3). ) Makes it easy to adjust the flow of the fluid whose flow has been corrected. Therefore, it becomes easy to provide the header (10) which can inject a more uniform fluid by setting it as such a structure.
Here, the rectifier (7) according to the present configuration mainly suppresses the flow of the fluid after the flow has been corrected by the guiding fluid (3) from flowing in the longitudinal direction of the guiding fluid (3). Therefore, unlike the embodiment in which the flow of the fluid supplied from the pipe is directly adjusted, it is possible to suppress the pressure loss of the fluid in the header (10). Therefore, with this configuration, the pressure of the fluid in the header (10) can be maintained at a pressure that can be jetted from the nozzle tip (2).

  Furthermore, in the first aspect of the present invention, when one of the flanges (4b) is extended more than the other of the flanges (4a), the header (10) that can eject a uniform fluid is easily provided. It becomes possible.

  In addition, in the first aspect of the present invention, if the stagnation prevention means (9) for suppressing the flow of the fluid to the direction other than the nozzle tip (2) is provided, the turbulence is generated in the header (10). Therefore, it is easy to provide a header (10) that can eject a uniform fluid.

  In the first aspect of the present invention, if the stagnation prevention means (9) is a fin attached to the fluid introduction (3) that restricts the flow in the direction opposite to the nozzle tip (2), it is uniform. It becomes possible to provide the header (10) capable of ejecting a simple fluid more easily.

  According to the second aspect of the present invention, since the cooling device includes the header (10) having a high fluid ejecting ability and a uniform fluid ejecting ability, the material to be cooled is cooled uniformly and rapidly. It becomes possible to provide a cooling device that can be used.

Embodiments of the present invention will be described below.
First, in order to explain the features of the present invention, FIG. 7 shows a conventional header. FIG. 7A is a vertical sectional view schematically showing a conventional header, and FIG. 7B is a front view schematically showing a part of a cooling device provided with the conventional header. Here, in FIG. 7A, the direction perpendicular to the paper surface is the longitudinal direction of the header, while in FIG. 7B, the left-right direction of the drawing is the longitudinal direction of the header. In the following description, a case where water is supplied from a pipe will be described. In FIG. 7, the arrow (thick line) indicates the direction of water sprayed from the nozzle tip. Hereinafter, a conventional header will be described with reference to FIGS. 7A and 7B as appropriate.

  As shown in FIG. 7A, the conventional header 50 having a cochlear cross-sectional shape includes a curved portion 51a and a flat plate portion 51b, and is attached to the end portion 54b of the curved portion 51a and the flat plate portion 51b. A nozzle tip 52 is formed by the end 54a of the member 51d. Here, the flat plate portion 51b and the member 51d are fixed by a bolt 12, and a hole is formed in the flat plate portion 51b, and a long hole is formed in the member 51d. Therefore, the member 51d can move in the direction of the arrow (broken line) in the figure, and the slit width T of the nozzle tip 52 can be adjusted by such movement.

  On the other hand, the main pipe 30 shown in FIG. 7B is supplied with water from a water supply source (not shown) by a pump. The header 50 and a plurality of pipes 20, 20,... Arranged at regular intervals in the longitudinal direction of the header 50 are connected via a plurality of openings 51 c, 51 c,. The water flowing through the main pipe 30 and the pipes 20, 20,... Is supplied into the header 50 through the openings 51c, 51c,. Here, since the pipes 20, 20,... Connected to the header 50 have a certain interval, depending on whether the pipes 20, 20,. Fluctuations in water pressure are likely to occur in the longitudinal direction. Further, since the inside of the conventional header 50 is hollow, turbulent flow is generated in the inside and the water reaches the nozzle tip 52 as it is. As a result, the water discharged from the conventional header 50 tends to be uneven. There was a problem. Therefore, in the present invention, a fluid is provided in the header, and a flow stabilizing means is provided in the flange portion that forms the nozzle tip, thereby forming a header capable of ejecting a uniform fluid.

  FIG. 1 shows a header of the present invention according to the first embodiment. FIG. 1A is a vertical sectional view showing a header according to the present embodiment, and FIG. 1B is a front view schematically showing a part of a cooling device including the header according to the present invention. . Here, in FIG. 1A, the direction perpendicular to the paper surface is the longitudinal direction of the header, while in FIG. 1B, the left-right direction of the drawing is the longitudinal direction of the header. In the following description, a case where water is supplied from a pipe will be described. In FIG. 1, an arrow (thick line) indicates the direction of water sprayed from the nozzle tip. In FIG. 1A, T is the slit interval at the nozzle tip, θ ′ is the angle between the tapered end surface of the flange and the water sprayed from the nozzle tip, L ′. Represents the lengths of the flange end faces in the water injection direction, respectively.

As shown in FIG. 1 (a), the header 10 of the present invention according to the first embodiment includes a guiding fluid 3, a rectifying body 7, a rib 9, and a fixing member 13 in addition to the conventional header structure. I have. And the notch 6 is formed in the one end surface 5a of the nozzle front-end | tip part 2, and the other end surface 5b is formed in the taper shape.
The header 10 of the present invention according to the first embodiment has a cochlear cross-sectional shape, and includes a curved portion 11a and a flat plate portion 11b. The water flowing in the pipe 20 is supplied into the header 10 through the opening 11c formed in the curved portion 11a, and the water is described as an end portion of the curved portion (hereinafter, referred to as “saddle”). From the nozzle tip portion 2 formed by 4b and the end portion of the member 11d attached to the flat plate portion 11b (hereinafter may be referred to as a “ridge portion”) 4a, the header 10 It is injected to the outside. In the header 10 according to the present invention, the water supplied to the inside of the header 10 is corrected in flow by a circular tubular guiding fluid 3 provided in the header 10, and the water whose flow is corrected is the above-described guiding fluid 3. And is guided to the nozzle tip 2 through a space formed by the inclined surface 4x of the flange portion 4a formed in a tapered shape and the inner wall of the curved portion 11a. Furthermore, the notch 6 is formed in the end surface 5a of the collar part 4a which forms the nozzle front-end | tip part 2, and the other collar part 4b is a taper shape where the front-end | tip of the said collar part 4b becomes thin. It has an end face 5b.

  The guiding fluid 3 provided in the header 10 according to the present embodiment is provided with a rib 9 as a stagnation prevention means and a rectifying body 7. In the header 10 shown in FIG. 1A, the rib 9 serves to prevent water supplied from the pipe 20 from flowing in a direction other than the nozzle tip 2, while the rectifying body 7 3 plays the role of suppressing the flow of water toward the longitudinal direction. Here, the longitudinal lengths of the guiding fluid 3 and the rib 9 provided in the header 10 are approximately the same as the longitudinal length of the inner wall of the header 10, and the guiding fluid 3 ejects water from the nozzle tip 2. Arranged as possible. In the header 10, a hole is formed in the flat plate portion 11b, and a hole larger than the hole provided in the member 11d is formed in the member 11d. The flat plate portion 11b and the member 11d are fixed by bolts 12. ing. Therefore, the nozzle tip 2 applied to the header 10 is fixed by using the bolt 12 after moving the flange 4a in the direction of the arrow (broken line) in FIG. It is configured to be adjustable. Further, since the fluid 3 is fixed inside the header 10 via flanges and bolts (both not shown) provided at both ends of the fixing member 13 or the header 10, the header configured in this way. 10 can be produced at a relatively low cost without using a casting operation.

  As described above, the header 10 according to the present invention includes the guiding fluid 3 having a length in the longitudinal direction equivalent to the length in the longitudinal direction of the inner wall of the header 10. By adopting such a form, the flow of the water supplied to the inside of the header 10 through the main pipe 30 and the pipes 20, 20,. That is, the water colliding with the portion of the guiding fluid 3 located immediately below the pipes 20, 20,... In the inside of the header 10 wraps around the portion of the guiding fluid 3 that is not directly below the pipes 20, 20,. In addition, the water can be guided to the nozzle tip 2 through the space formed by the fluid guide 3, the inclined surface 4x, and the inner wall of the curved portion 11a. Therefore, before the water supplied from the pipes 20, 20,... To the header 10 is jetted from the nozzle tip 2, the pressure fluctuation is suppressed inside the header 10. Therefore, according to the header 10 having such a configuration, it is possible to eject the film-like water 8 having a uniform flow (see FIG. 1B). Moreover, since the header 10 concerning this embodiment is comprised so that water can be injected as mentioned above, the header 10 also has high water-injection ability. Therefore, if the cooling device includes the header 10 according to the present embodiment, the material to be cooled can be uniformly and rapidly cooled.

  In addition, the header 10 according to the present invention is configured such that the notch 6 is formed in at least one of the end surfaces 5a and 5b, or the end surfaces 5a and 5b become narrower toward the tips of the flange portions 4a and 4b. It is formed in a taper shape. Here, if these processes are not performed on the end face, a negative pressure is generated between the water sprayed from the tip of the nozzle and the end faces 5a and 5b of the flanges 4a and 4b, and the sprayed water becomes the end faces 5a and 5b. As a result, the flow of the injected water becomes uneven. Therefore, in the header 10 according to the present invention, by adopting the above-described configuration, the flow of the jetted water is prevented from becoming uneven. In the following, the term “flow stabilizing means” may be used as a concept including forming a notch in the end face and forming a tapered end face.

  When the notch is formed in the end face 5a and / or 5b, the notch depth L1 is preferably 0.5 mm or more from the viewpoint of obtaining the negative pressure suppressing effect. Furthermore, from the viewpoint of obtaining a sufficient negative pressure effect, the more preferable notch depth L1 is equal to or greater than the slit interval T of the nozzle tip 2. Here, the upper limit of the notch depth L1 is not particularly limited, and the depth can be appropriately determined by comprehensively considering the negative pressure suppressing effect and the notch machinability. Further, from the viewpoint of obtaining a sufficient negative pressure suppressing effect, it is preferable that the notch angle θ formed in the end faces 5a and / or 5b is 60 to 90 degrees. In addition, from the viewpoint of obtaining a negative pressure suppressing effect, the notch width L2 is preferably 3 mm or more.

  On the other hand, when the end surfaces 5a and / or 5b are tapered end surfaces, as will be described later, from the viewpoint of obtaining a sufficient negative pressure effect, the tapered end surfaces 5a and 5b and the nozzle tip portion are used. The angle θ ′ formed with the water to be jetted is 45 degrees or less, and the length L ′ in the jetting direction of the tapered end faces 5a and 5b is set to be equal to or greater than the slit interval T of the nozzle tip portion 2. Is preferred.

FIG. 2 shows an example of a form of an end face provided with the flow stabilizing means. FIG. 2 is a vertical cross-sectional view schematically showing an enlarged part of the header according to the present invention centering on a pair of flanges forming the nozzle tip, and water is jetted downward in the figure. Shall be. In FIG. 2, parts having the same configuration as in FIG. 1A are denoted by the same reference numerals as those used in FIG.
2A shows a form in which notches are formed only on one end face, and FIG. 2B shows a form in which notches are formed on a pair of end faces. On the other hand, FIG. 2 (c) shows a form in which one end face is formed in a taper shape, and FIG. 2 (d) shows a form in which a pair of end faces are formed in a taper shape. Yes. FIG. 2E shows a form in which a notch is formed on one end surface and the other end surface is tapered. In order to facilitate understanding, in FIG. 2 (b), the slit interval T at the nozzle tip, the angle θ ′ formed between the tapered end surface of the flange and the water sprayed from the nozzle tip, and The length L ′ of the flange end face in the water injection direction is shown in FIG. 2D, the notch depth L1 is shown in FIG. 2E, and the notch angle θ is shown in FIG. From the viewpoint of making the figure easy to see, the notation of T, θ ′, L ′, L1, and θ is omitted as appropriate in the figures other than the above.

  As shown in FIGS. 2 (a) and 2 (c), in the header 10 according to the present invention, if one end surface is provided with a flow stabilizing means, the header 10 having a negative pressure suppressing effect can be obtained. However, from the viewpoint of obtaining a sufficient negative pressure suppressing effect, it is preferable that the pair of end faces include a flow stabilizing means. When the pair of end faces are provided with flow stabilization, the form is not particularly limited, and specific examples of the form include FIGS. 2B, 2D, and 2E.

  For convenience, in the above description, the end face 5a, 5b has been described as being arranged at a position aligned with the water injection direction. However, in the header according to the present invention, one of the flanges is further provided with the water injection direction. It is preferable to stretch to. By setting it as this structure, it becomes easy to make water sprayed from the nozzle front-end | tip part 2 more uniform. FIG. 3 schematically shows a header 10 </ b> A in a form in which one hook part is extended in the water injection direction more than the other hook part. In the header 10A according to the second embodiment, one end surface 5b is extended in the water injection direction more than the other end surface 5a, while other parts are the same as the header 10 according to the first embodiment. It has. Therefore, each component of the header 10A according to FIG. 3 is given the same reference numeral as each component of the header 10 according to the first embodiment, and the description thereof is omitted.

  Moreover, in the said description, although the header 10 provided with the cylindrical conducting fluid 3, the rectifier 7, and the rib 9 was demonstrated, the conducting fluid which the header concerning this invention can be equipped is not limited to this form. For example, a header including a plate-like fluid or the like may be used. Furthermore, the header according to the present invention may be in a form that does not include a rectifier or a rib as long as the header includes a flange portion that includes a fluid guide and a flow stabilizing means. Therefore, FIG. 4 shows a header that is provided with a flange including a plate-like fluid and flow stabilizing means, but does not include a rectifier and a rib.

  FIG. 4 is a vertical sectional view schematically showing a header 10B of the present invention according to the third embodiment. The header 10B according to the third embodiment is provided with a plate-like fluid 3 'having an L-shaped cross section, but is not provided with a rectifier and a rib. The end surface 5a is formed with a notch 6, and the end surface 5b is formed in a tapered shape. In addition, in FIG. 3, the same reference numerals as those used in FIG. 1 (a) are given to portions having the same configuration as in FIG. 1 (a), and description thereof is omitted.

  The guiding fluid 3 ′ provided in the header 10 </ b> B according to the third embodiment has a length in the longitudinal direction equivalent to the length in the longitudinal direction of the inner wall of the header 10 </ b> B, similarly to the guiding fluid 3 according to the first embodiment. Yes. Therefore, the pressure fluctuation of the water in the header 10B can be suppressed also by the fluid guide 3 'according to the present embodiment. Therefore, even if the cooling device includes the header 10B according to the present embodiment, the material to be cooled can be uniformly and rapidly cooled.

  For example, like the header 10 according to the first embodiment, the water supplied from the pipes 20, 20,... Is supplied to the nozzle tip 2 through the inclined surface 4x of the flange 4a formed in a tapered shape. In the case of guiding to the angle, the angle formed between the spray direction of the water sprayed from the nozzle tip 2 and the inclined surface 4x is not particularly limited. The angle is preferably set to 20 degrees or more and 40 degrees or less from the viewpoint of keeping the size of the header 10 compact and smoothly guiding water to the nozzle tip 2.

  Further, in the case of including the tubular guiding fluid 3 as in the header 10 according to the first embodiment, from the viewpoint of enabling water supplied from the pipe 20 to be effectively guided to the nozzle tip 2. It is preferable that the flow path cross-sectional area of the portion through which the fluid flows between the guiding fluid 3 and the header is 55 to 95% of the total cross-sectional area of the fluid supply pipes 20, 20,.

  Further, for convenience, in the above description, the form in which water is supplied into the header has been described. However, the fluid that can be supplied to the header according to the present invention is not limited to a liquid such as water, but may be air or the like. It may be a gas. When compressed air is supplied to the header according to the present invention, an apparatus including the header is, for example, a draining apparatus used to drain water staying on a steel plate, or a gas wiping apparatus in a hot dip galvanizing line. Etc. can also be used.

<Example 1>
The relationship between the shape of the notch formed on the flange end surface of the header according to the present invention and the stability of the water flow sprayed from the header, and the case where the flange end surface of the header according to the present invention is tapered The relationship between the taper shape and the stability of the water flow was examined. The former result is shown in Table 1, and the latter result is shown in Table 2. In addition, the result concerning Table 1 is a result at the time of forming a notch in a pair of collar part end surface, and the result concerning Table 2 is a result when a pair of collar part end surface is formed in a taper shape.

ここに、表１及び表２において、スリット出口幅Ｔとは、ノズル先端部のスリット間隔Ｔを、スリット流量とは、ノズル先端部から噴射される単位時間当たりの水量をスリットの長手方向長さが１ｍである場合に換算したものを、それぞれ表している。また、表１及び表２において、水流の安定性は、水流が振動していたか否かによって評価し、振動が生じた場合を×、振動が生じなかった場合を○と表記した。ヘッダーの嘴部と水流との間に負圧が生じると、水流が振動するため、当該振動の有無は、負圧の有無を認識する際の指標にもなり得る。

Here, in Table 1 and Table 2, the slit outlet width T is the slit interval T at the nozzle tip, and the slit flow rate is the amount of water per unit time injected from the nozzle tip, the length in the longitudinal direction of the slit. The values converted in the case where is 1 m are respectively shown. In Tables 1 and 2, the stability of the water flow was evaluated based on whether or not the water flow was vibrated. The case where vibration occurred was indicated as x, and the case where no vibration occurred was indicated as ◯. When a negative pressure is generated between the flange portion of the header and the water flow, the water flow vibrates. Therefore, the presence or absence of the vibration can be an index for recognizing the presence or absence of the negative pressure.

  From Table 1, when notch angle (theta) was less than 60 degree | times (Example 1A-3, Example 1A-4), the water flow vibrated. Even when the notch angle θ was 60 degrees, the water flow vibrated when the notch depth L1 was less than the slit exit width T (Example 1A-5). Therefore, it was confirmed from this example that a header capable of injecting a uniform water flow is provided by setting the notch angle θ to 60 to 90 degrees and setting the notch depth L1 to L1 ≧ T.

  Further, from Table 2, when the angle θ ′ (taper angle; see FIG. 1A) formed by the tapered end surface of the flange and the water sprayed from the nozzle tip exceeds 45 degrees (Example) 1B-3), the water flow vibrated. Further, even when the angle θ ′ is 45 degrees or less, the length L ′ (see FIG. 1A) of the tapered end surface of the flange portion in the injection direction is less than the slit outlet width T. (Example 1B-4), the water flow vibrated. Therefore, from this embodiment, the angle θ ′ is set to 45 degrees or less and the tapered end surface of the taper is formed so that the length L ′ satisfies L ′ ≧ T, thereby ejecting a uniform water flow. It was confirmed that a header to obtain was provided.

<Example 2>
A flow rate distribution of water injected from the header according to the present invention shown in FIG. 1 (a) (Example) and a flow rate distribution of water injected from the conventional header shown in FIG. 7 (a) (comparative example). We examined and compared these results. In the headers according to the example and the comparative example, the slit interval at the nozzle tip is 2 mm, the longitudinal direction (hereinafter sometimes referred to as “width direction”) is 600 mm, and the unit time supplied to the header The amount of water per hit was 1 m ³ / min, the pressure of water sprayed from the nozzle tip was 147 kPa, and the flow rate of water was measured every 20 mm in the width direction. The result of an Example and the result of a comparative example are shown according to FIG. In FIG. 5, the water volume distribution ratio is the ratio of the water volume (water volume per unit width) of each water volume sampling tube in the width direction to the average reference flow rate.
Moreover, in FIG. 6, the external appearance of the water sprayed from the header concerning an Example and a comparative example is shown. 6A shows the appearance of water sprayed from the header according to the example, and FIG. 6B shows the appearance of water sprayed from the header according to the comparative example.

  As shown in FIG. 5, the water sprayed from the header according to the example was less changed in the water amount distribution ratio than the water sprayed from the header according to the comparative example. Therefore, it was confirmed that the water sprayed from the header concerning this invention is more uniform than before. Moreover, it was confirmed from FIG. 6 that the header according to the example can inject uniform film-like water, unlike the header according to the comparative example.

As described above, according to the header of the present invention, uniform film-like water can be ejected. Therefore, when the header according to the present invention is applied to a steel sheet cooling device, the uneven cooling at the front and rear end portions of the steel sheet is greatly reduced, and the shape defect occurrence rate in the steel sheet after cooling is reduced to 50% or less of the prior art. Was possible.
In addition, when the header according to the present invention is applied to a cooling device having a slit-like nozzle that discharges laminar water, the pressure fluctuation of water at the start of use of the slit laminar flow is suppressed, It was possible to prevent film breakage and fluctuation of contraction flow at the end of the header in the width direction. Therefore, the header according to the present invention is also applicable to a cooling device in a form in which laminar water is discharged. When the steel sheet was cooled using such a cooling device, it was possible to cool the steel sheet uniformly and to significantly reduce the flatness failure rate in the steel sheet after cooling.

  Furthermore, unlike the conventional header, the header according to the present invention was able to spray uniform water even when the header had a compact size like the header according to the embodiment. Therefore, according to the present invention, it is possible to provide a cooling device capable of spraying uniform water in a more compact size than the conventional one. If the cooling device according to the present invention that is more compact than before is used, it is possible to adjust the slit interval (about 1 to 5 mm) with an accuracy of ± 0.1 mm in a short time (a time of half a day or less). Here, the conventional cooling device having the same cooling ability as the compact cooling device according to the present invention has a size of about 5 m wide × 1 m deep, and the time required for adjusting the slit interval is one day or more. Met. Therefore, according to the present invention, it has been confirmed that a cooling device with improved maintainability can be provided.

It is a figure showing roughly the header of the present invention concerning a 1st embodiment. It is sectional drawing which shows schematically the example of a form of a collar part end surface. It is sectional drawing which shows roughly the header of this invention concerning 2nd Embodiment. It is sectional drawing which shows roughly the header of this invention concerning 3rd Embodiment. It is a figure which shows the fluctuation | variation of the water quantity distribution ratio in the width direction. It is a figure which shows the external appearance of the water sprayed from a header. It is a figure which shows the conventional header schematically.

Explanation of symbols

2 Nozzle tip 3, 3 ′ Fluid 4a, 4b Gutter 5a, 5b End face 6 Notch 7 Rectifier 8 Fluid (water)
9 Itching prevention means (rib)
10, 10A, 10B Header 20 Piping

Claims (10)

A header having a slit-like nozzle tip connected to a pipe for supplying fluid,
Inside thereof, a fluid for guiding the fluid supplied from the pipe to the nozzle tip is provided,
The nozzle tip is formed by a pair of flanges, and at least one of the flanges is provided with flow stabilization means ,
The header according to claim 1, wherein the flow stabilizing means is a notch formed on the end face of the flange portion or a tapered end portion formed on the flange portion . The header according to claim 1, wherein a rectifier that suppresses the flow of the fluid toward the longitudinal direction of the fluid is provided . 3. The header according to claim 1 , wherein one of the flanges extends in a direction of ejecting fluid ejected from the nozzle tip, rather than the other of the flanges. The header according to any one of claims 1 to 3, wherein stagnation prevention means for suppressing the flow of the fluid toward the portion other than the nozzle tip is provided . 5. The header according to claim 4 , wherein the stagnation preventing means is a fin that is attached to the fluid guide and restricts a flow in a direction opposite to the nozzle tip . A header having a slit-like nozzle tip connected to a pipe for supplying fluid,
Inside thereof, a fluid for guiding the fluid supplied from the pipe to the nozzle tip is provided,
The nozzle tip is formed by a pair of flanges, and at least one of the flanges is provided with flow stabilization means,
The stagnation prevention means which suppresses the flow of the said fluid which goes to other than the said nozzle front-end | tip part is provided, The header characterized by the above-mentioned . The header according to claim 6, wherein a rectifying body that suppresses the flow of the fluid toward the longitudinal direction of the guiding fluid is provided. 8. The header according to claim 6, wherein one of the flanges extends in a direction of ejecting fluid ejected from the nozzle tip, rather than the other of the flanges. 9. The header according to any one of claims 6 to 8, wherein the stagnation preventing means is a fin that is attached to the fluid guide and regulates a flow in a direction opposite to the nozzle tip. . A cooling device comprising the header according to claim 1.

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