JP2008264597A - Cooling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow the distribution of the flow rate of cooling water discharged from a slit nozzle to be made uniform in the longitudinal direction of the slit nozzle. <P>SOLUTION: The cooling apparatus 1 has a cooling water supply pipe 2 having a plurality of supply holes 5 formed in the longitudinal direction. A header 6 surrounding the cooling water supply pope 2 is provided outside the cooling water supply pipe 2, and a flow-out opening 8 for the cooling water is formed on the upper surface of the header 6. On the flow-out opening 8 side of the header 6, the side surface 9a of the slit nozzle 9 is formed in contact with the side surface 6a of the header 6, and the flow-in opening 13 of the cooling water is formed on the upper end of the slit nozzle 9. The flow-out opening 8 and the flow-in opening 13 communicate with each other with a cooling water flow passage 15. Even while the supply of the cooling water from the cooling water supply pipe 2 is stopped, the slit nozzle 9 is cooled by the cooling water retained inside the header 6. The slit nozzle 9 can be provided inside the header 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling device for cooling high-temperature steel after heat treatment.

  For example, when cooling a steel material carried out at a high temperature after hot rolling, a so-called pipe laminar nozzle that discharges cooling water onto a steel material from a plurality of pipes arranged in a horizontal direction has been conventionally used. When this pipe laminar nozzle is used, since the cooling water is sprayed in a point-like manner on the steel material, and the amount of water itself from each pipe is likely to change, the steel material could not be cooled uniformly. .

  Therefore, a slit nozzle that has a slit-like discharge port in the width direction of the steel material and uniformly cools the steel material has been proposed. As shown in FIG. 11, the slit nozzle 100 includes a main body having a double structure of an inner tube 101 and an outer tube 102, a liquid reservoir 103 provided at a lower portion of the main body, and a lower portion of the liquid reservoir 103. And a nozzle tip 104 having a slit-like discharge port. The liquid reservoir 103 is attached to the outer tube 102 so that the upper surface is open in an elongated box shape and the upper surface of the liquid outlet portion 102a formed at the lower portion of the outer tube 102 surrounds. The bottom surface of the liquid reservoir 103 facing the upper surface of the opening forms a rectifying plate 103 a having rectifying holes 103 b arranged in two rows along the longitudinal direction of the liquid reservoir 103. And the cooling water which flowed out from the liquid outflow part 102a of the outer tube | pipe 102 once retains in the liquid storage part 103, after compressing substantially uniformly in the meantime, it rectifies | straightens from the rectifying hole 103b, and is discharged | emitted. The discharged cooling water is discharged from the discharge port of the nozzle tip 104 to the steel material (Patent Document 1).

JP 2002-28537 A

  However, in the manufacturing process of the steel material, depending on the thickness and type of the steel material, even when the steel material is moving under the conventional slit nozzle 100, the cooling water may not be discharged to the steel material. That is, the cooling water may not be allowed to flow through the slit nozzle 100. In this case, there is a possibility that the nozzle tip 104 of the slit nozzle 100 is distorted by the radiant heat from the high-temperature steel material, and the amount of cooling water discharged from the nozzle tip 104 is not uniform in the longitudinal direction of the slit nozzle 100. It was. In this case, the steel material could not be cooled uniformly.

  Moreover, if the slit width | variety of the slit nozzle 100 is narrow, the water quantity of the cooling water discharged in the case of cooling of steel materials can be decreased, and it becomes easy to control the discharge flow rate of cooling water according to steel materials. However, when the slit width is narrow, the distortion of the nozzle tip 104 due to the radiant heat from the steel material is further increased as compared with the case where the slit width is wide, so the slit nozzle 100 with a narrow slit width has not been realized.

  The present invention has been made in view of such a point, and even if the slit width of the slit nozzle is narrowed, the water amount distribution of the cooling water discharged from the slit nozzle is made uniform in the longitudinal direction of the slit nozzle. Objective.

  In order to achieve the above object, the cooling device of the present invention is a cooling device that discharges cooling water to a steel material to cool the steel material, and includes a cooling water supply pipe having a cooling water supply hole, and the cooling device. A header that surrounds the water supply pipe and has a cooling water outlet formed at the top, and a cooling water inlet that flows out of the outlet is formed at the top, and a slit-like discharge that discharges the flowing cooling water to the steel. A slit nozzle having an outlet formed in a lower portion, and a cooling water flow path connecting the outlet of the header and the inlet of the slit nozzle, and at least a part of a side surface of the slit nozzle is formed on the header. It is characterized by touching the side.

  According to the cooling device of the present invention, since the cooling water outlet is formed in the upper part of the header, the cooling water is provided inside the header even while the supply of the cooling water to the cooling water supply pipe is stopped. Stays. Since at least a part of the side surface of the slit nozzle is in contact with the side surface of the header, the side surface of the slit nozzle in contact with the header is cooled by the cooling water staying inside the header. This cooling effect propagates to the entire slit nozzle, and the tip of the slit nozzle is also cooled. Therefore, the tip portion of the slit nozzle is not distorted by radiant heat from a high-temperature steel material as in the prior art, so that the slit width can be made uniform in the longitudinal direction of the slit nozzle. Therefore, the water amount distribution of the cooling water discharged from the slit nozzle can be made uniform in the longitudinal direction of the slit nozzle.

  Even when the slit width is narrowed, the tip of the slit nozzle is cooled as described above. Therefore, since the steel material can be cooled using a slit nozzle having a narrow slit width, the amount of cooling water discharged when cooling the steel material can be reduced, and the cooling water discharge flow rate can be reduced depending on the steel material. It becomes easier to control.

  Further, when cooling the steel material, if it is necessary to control the temperature of the steel material, it is necessary to discharge the cooling water as soon as possible, or stop the cooling water discharge as soon as possible. According to the cooling device of the present invention, even if the supply of the cooling water from the cooling water supply pipe is stopped, the cooling water inside the header is not discharged from the slit nozzle. Accordingly, when the supply of the cooling water from the cooling water supply pipe is stopped, the discharge of the cooling water from the slit nozzle can be stopped immediately. Even when the cooling water supply from the cooling water supply pipe is stopped, the cooling water stays inside the header. Therefore, when the cooling water supply is started again, it stays inside the header. The cooling water which is flowing is pushed away and discharged from the slit nozzle. Therefore, when the cooling water is supplied from the cooling water supply pipe, the cooling water can be immediately discharged from the slit nozzle.

  The horizontal distance between the contact surface of the header that is in contact with the slit nozzle and the center of the cooling water supply pipe is the horizontal distance between the side surface of the header that faces the contact surface and the center of the cooling water supply pipe. It may be longer than the directional distance. As a result, a large amount of cooling water flows to the slit nozzle side in the header while the cooling water is supplied, and a large amount of cooling water stays on the slit nozzle side when the cooling water supply is stopped. The cooling effect can be improved.

  The side surfaces where the slit nozzle and the header are in contact may each be made of copper or a copper alloy. As described above, by using copper or copper alloy having good thermal conductivity, the side surface of the slit nozzle can be cooled more efficiently.

  The header may have a rectangular cross-sectional shape. Thus, if the cross-sectional shape is a quadrangle, the area where the header and the slit nozzle are in contact with each other is increased, so that the cooling effect of the slit nozzle can be improved.

  The cooling device of the present invention according to another aspect is a cooling device that discharges cooling water to a steel material to cool the steel material, and includes a cooling water supply pipe having a cooling water supply hole, and the cooling water supply pipe. Surrounding, a header formed with a cooling water outlet at the top, a cooling water inlet flowing out from the outlet at the top, and a slit-like outlet for discharging the cooling water into the steel at the bottom A slit nozzle formed, and a cooling water passage connecting the outlet of the header and the inlet of the slit nozzle, and the slit nozzle is installed inside the header, and the tip of the slit nozzle Is characterized by protruding from the bottom of the header. According to the cooling device of the present invention, since the slit nozzle is immersed in the cooling water inside the header, both side surfaces of the slit nozzle can be cooled, and the cooling effect of the slit nozzle can be further improved.

  The inlet of the slit nozzle may be formed at the same position as or higher than the outlet of the header. Thus, when the cooling water is supplied from the cooling water supply pipe, the cooling water can be immediately discharged from the slit nozzle. Further, when the supply of the cooling water from the cooling water supply pipe is stopped, the discharge of the cooling water from the slit nozzle can be stopped immediately.

  The side surface of the slit nozzle inside the header may be made of copper or a copper alloy. As described above, by using copper or copper alloy having good thermal conductivity, the side surface of the slit nozzle can be cooled more efficiently.

  The supply hole may be formed on the outer peripheral surface on the lower end side with a central angle within 45 degrees from the vertical central axis of the cooling water supply pipe as seen from the vertical cross section of the cooling water supply pipe. As a result of investigations by the inventors, if a supply hole is formed on the outer peripheral surface in this range, the cooling water supplied from the supply hole can flow to the outlet of the header without staying inside the header. .

  According to the present invention, since the slit nozzle can be cooled by the cooling water in the header, even if the slit width of the slit nozzle is narrowed, the tip portion of the slit nozzle is not distorted, and the amount of cooling water discharged from the slit nozzle is distributed. Can be made uniform in the longitudinal direction of the slit nozzle.

  Hereinafter, preferred embodiments of the present invention will be described. 1 and 2 are side views of the cooling device 1 according to the present embodiment, and FIG. 3 is a longitudinal sectional view of the cooling device 1.

  The cooling device 1 has a circular cooling water supply pipe 2 as shown in FIGS. An opening 3 for supplying cooling water is formed at one end in the longitudinal direction of the cooling water supply pipe 2, and a cooling water supply source (not shown) is connected to the opening 3. The other end of the cooling water supply pipe 2 is closed by a side plate 4. As shown in FIG. 4, a plurality of supply holes 5 having the same diameter are formed in a row in the longitudinal direction on the outer peripheral surface of the cooling water supply pipe 2. FIG. 4 is a side view of the cooling water supply pipe 2 as viewed obliquely from below. As shown in FIG. 3, the supply hole 5 is an outer peripheral surface on the lower end side whose central angle α is 45 degrees from the vertical center axis X of the cooling water supply pipe 2, for example. 6 are formed at positions opposite to each other in the diagonal direction.

  As shown in FIGS. 1 to 3, a header 6 surrounding the cooling water supply pipe 2 is provided outside the cooling water supply pipe 2. The cooling water supply pipe 2 inside the header 6 is arranged at the center of the header 6 as shown in FIG. The header 6 is a hollow cylinder, and its vertical cross-sectional shape is a square. Both ends in the longitudinal direction of the header 6 are closed by side plates 4 and 7, and the cooling water supply pipe 2 is inserted through the side plate 7. As shown in FIGS. 3 and 5, a plurality of outlets 8 through which the cooling water in the header 6 flows out are formed on the upper surface of the header 6 in the longitudinal direction of the header 6. FIG. 5 is a side view of the header 6 as viewed from above. Moreover, the outflow port 8 is formed in the position which opposes the supply hole 5 of the cooling water supply pipe 2 and the header 6 diagonally as shown in FIG.

  As shown in FIG. 3, a slit nozzle 9 that discharges cooling water to the steel material is provided on the outlet 8 side of the header 6. A side surface 9 a on the header 6 side of the slit nozzle 9 is in contact with a side surface 6 a on the outlet 8 side of the header 6. The slit nozzle 9 is narrowed toward the header 6 at the tip portion 10. That is, the side surface 9a of the slit nozzle 9 has a flat plate shape, while the side surface 9b facing the side surface 9a is bent downward from the center toward the header 6 side. The lower end of the front end portion 10 of the slit nozzle 9 is opened to form a slit-like discharge port 11 for discharging cooling water, and the length of the discharge port 11 in the longitudinal direction is larger than the width of the steel material. The discharge port 11 is formed in the vicinity of the side surface 6 a of the header 6 in contact with the slit nozzle 9 and in the vicinity of the lower surface of the header 6. A rectifier 12 that rectifies the flow of the cooling water is provided inside the slit nozzle 9. For example, a plurality of lattice-shaped or honeycomb-shaped through holes extending in the vertical direction are used for the rectifier 12, and the flow of the cooling water is rectified by passing through the through holes. The upper end of the slit nozzle 9 is opened to form an inlet 13 into which cooling water flowing out from the outlet 8 of the header 6 flows. The inflow port 13 is formed at the same height as the outflow port 8.

  As shown in FIG. 3, a rectangular parallelepiped block body 14 is provided above the header 6 and the slit nozzle 9. A groove having a substantially rectangular cross section is formed in the lower part of the block body 14, and this groove covers the outlet 8 of the header 6 and the inlet 13 of the slot nozzle 9, and connects the outlet 8 and the inlet 13. The cooling water flow path 15 is formed.

  For example, stainless steel or plain steel is used as the material of the cooling water supply pipe 2, the header 6, the slit nozzle 9, and the block body 14 described above.

  The cooling device 1 according to the present embodiment is configured as described above. Next, the cooling of the steel material performed by the cooling device 1 will be described. In addition, the arrow in FIG. 3 has shown the direction of the flow of cooling water.

  First, cooling water is supplied from the opening 3 into the cooling water supply pipe 2. The cooling water inside the cooling water supply pipe 2 flows into the header 6 from the supply hole 5. The cooling water flowing in from the supply hole 5 is divided into two directions, and flows between the outer peripheral surface of the cooling water supply pipe 2 and the side surface of the header 6 to the outlet 8. The cooling water flowing out from the outlet 8 flows into the slit nozzle 9 from the inlet 13 through the cooling water passage 15. The flow of the cooling water in the slit nozzle 9 is rectified by the rectifier 12 and discharged from the discharge port 11 toward the steel material.

  Next, when stopping the discharge of the cooling water to the steel material, the supply of the cooling water from the opening 3 to the inside of the cooling water supply pipe 2 is stopped. Then, the flow of the cooling water in the header 6 is stopped, and only the cooling water in the cooling water flow path 15 and the slit nozzle 9 is discharged from the discharge port 11. Therefore, while the discharge of the cooling water from the slit nozzle 9 is stopped, the cooling water stays in the cooling water supply pipe 2 and the header 6. Even when the supply of the cooling water to the cooling water supply pipe 2 is stopped in this way, the steel material may be conveyed below the slit nozzle 9, and in such a case, the slit nozzle 9 is radiant heat from the steel material. Receive. Then, the side surface 9 a of the slit nozzle 9 in contact with the side surface 6 a of the header 6 is cooled by the cooling water staying inside the header 6.

  When the discharge of the cooling water to the steel material is started again, the cooling water is supplied from the opening 3 into the cooling water supply pipe 2. Then, the supplied cooling water pushes the cooling water staying in the header 6, and the cooling water passes through the inside of the cooling water flow path 15 and the slit nozzle 9 and is discharged from the discharge port 11 to the steel material.

  As described above, the cooling water is discharged or stopped from the discharge port 11 of the slit nozzle 9 to cool a series of steel materials.

  According to the above embodiment, since the outflow port 8 is formed on the upper surface of the header 6, the cooling inside the header 6 is cooled even while the supply of the cooling water to the cooling water supply pipe 2 is stopped. Water stagnates. Since the side surface 9 a of the slit nozzle 9 is in contact with the side surface 6 a of the header 6, the side surface 9 a of the slit nozzle 9 is cooled by the cooling water staying inside the header 6. At this time, since the vertical cross section of the header 6 is square, the area where the side surface 6a of the header 6 contacts the side surface 9a of the slit nozzle 9 is large, and the cooling effect of the side surface 9a is large. The cooling effect is propagated to the entire slit nozzle 9, and the discharge port 11 of the slit nozzle 9 is close to the side surface 6 a of the header 6 so that the cooling water in the header 6 cools the front end portion 10. Therefore, the tip portion 10 of the slit nozzle 9 is also cooled. Therefore, the tip portion 10 of the slit nozzle 9 is not distorted by radiant heat from a high-temperature steel material as in the prior art, and the slit width of the discharge port 11 can be made uniform in the longitudinal direction of the slit nozzle 9. Therefore, the water amount distribution of the cooling water discharged from the slit nozzle 9 can be made uniform in the longitudinal direction of the slit nozzle 9.

  Even when the slit width of the discharge port 11 is narrowed, the tip portion 10 of the slit nozzle 9 is cooled as described above. Therefore, since the steel material can be cooled using the slit nozzle 9 having a narrow slit width, the amount of cooling water discharged when cooling the steel material can be reduced, and the cooling water discharge flow rate according to the steel material It becomes easy to control.

  Further, when stopping the discharge of the cooling water from the discharge port 11 to the steel material, if the cooling water supply from the cooling water supply pipe 2 is stopped, only the cooling water in the cooling water flow path 15 and the slit nozzle 9 is provided. Is discharged from the discharge port 11 and the cooling water inside the header 6 is not discharged. Therefore, when the supply of the cooling water from the cooling water supply pipe 2 is stopped, the discharge of the cooling water from the discharge port 11 can be stopped immediately. In addition, since the cooling water stays inside the header 6 while the cooling water supply from the cooling water supply pipe 2 is stopped, the cooling water stays inside the header 6 when the cooling water supply is started again. The cooling water that is being swept away is discharged from the discharge port 11. Therefore, when the cooling water is supplied from the cooling water supply pipe 2, the cooling water can be immediately discharged from the discharge port 11. Thus, since the responsiveness of the cooling device 1 is high with respect to discharge of the cooling water to a steel material, or a stop of discharge, exact temperature control of steel materials is attained.

  Further, since the rectifier 12 is provided inside the slit nozzle 9, turbulent flow or contraction does not occur in the flow of the cooling water discharged from the discharge port 11. Therefore, the cooling water can be discharged uniformly to the steel material.

  In the above embodiment, stainless steel is used for the header 6 and the slit nozzle 9, but copper or a copper alloy may be used for the material of the side surfaces 6a and 9a where the header 6 and the slit nozzle 9 are in contact. Thus, the side surface 9a of the slit nozzle 9 can be cooled more efficiently by using copper or a copper alloy having good thermal conductivity on the side surface.

  In the above embodiment, the supply hole 5 of the cooling water supply pipe 2 is the outer peripheral surface on the lower end side whose central angle α is 45 degrees from the vertical center axis X of the cooling water supply pipe 2, and the outlet of the header 6 8 and the header 6 are formed at diagonally opposite positions. As shown in FIG. 6, the supply hole 5 has a lower end whose central angle α is 45 degrees or less from the vertical central axis X of the cooling water supply pipe 2. It may be formed at any position as long as it is the outer peripheral surface. As a result of investigations by the inventors, if the supply hole 5 is formed on the outer peripheral surface in the above range, the cooling water supplied from the supply hole 5 is allowed to flow to the outlet 8 without staying in the header 6. be able to. Further, when the supply hole 5 is formed on the side surface 6a side of the header 6, a large amount of cooling water can be flowed to the side surface 6a side, so that the cooling effect of the slit nozzle 9 can be improved.

  In the above embodiment, the cooling water supply pipe 2 is arranged at the center of the header 6. However, as shown in FIG. 7, the space between the side surface 6 a of the header 6 and the vertical central axis X of the cooling water supply pipe 2 is used. The horizontal distance S may be longer than the horizontal distance T between the side surface 6b of the header 6 facing the side surface 6a and the vertical center axis X of the cooling water supply pipe 2. As a result, a large amount of cooling water flows on the side surface 6a while the cooling water is supplied, and a large amount of cooling water stays on the side surface 6a while the cooling water supply is stopped. Can be improved.

  In the above embodiment, the plurality of supply holes 5 have the same diameter. However, as shown in FIG. 8, the diameter of the supply holes 5 is reduced from the opening 3 toward the side plate 4. May be. The cooling water that is supplied from the opening 3 and flows inside the cooling water supply pipe 2 increases in the amount of water discharged from the supply holes 5 on the side plate 4 side due to the water flow side distribution in the cooling water supply pipe 2. In order to correct such a water amount distribution, the diameter of the supply hole 5 on the opening 3 side is increased to make the water amount distribution of the cooling water flowing out from the supply hole 5 more uniform in the longitudinal direction of the cooling water supply pipe 2. be able to.

  In the above embodiment, the slit nozzle 9 is provided outside the header 6, but the slit nozzle 20 may be provided inside the header 6 as shown in FIG. 9. The opposing side surfaces 20a and 20b of the slit nozzle 20 are bent downward from the vicinity of the center toward the center of the slit nozzle 20, and the tip 21 of the slit nozzle 20 is thin. The front end portion 21 protrudes from the lower portion of the header 6, and cooling water can be discharged from a slit-like discharge port 22 formed by opening the lower end of the front end portion 21. Inside the slit nozzle 20, a rectifier 23 having a lattice-like or honeycomb-like structure for rectifying the flow of the cooling water is provided. The upper part of the slit nozzle 9 protrudes from the upper part of the header 6, and the upper end of the slit nozzle 9 is opened to form an inlet 24 through which cooling water flows.

  The outlet 8 of the header 6 is formed on the upper surface on the cooling water supply pipe 2 side from the slit nozzle 20. A substantially rectangular parallelepiped cover 25 that covers the outlet 8 of the header 6 and the inlet 24 of the slit nozzle 20 is provided above the header 6. The cover 25 forms a cooling water flow path 26 that connects the outlet 8 and the inlet 24. On the top surface of the header 6, an outlet 27 having the same shape as the outlet 8 is formed at a position facing the outlet 8 across the slit nozzle 20. A cooling water flow path 28 that connects the outlet 27 and the inlet 24 is formed by the cover 25 described above. Further, the length of the header 6 in the longitudinal direction is longer than the length of the slit nozzle 20 in the longitudinal direction, as shown in FIG. Then, the space in the header 6 on both ends of the slit nozzle 20 forms a cooling water flow path 30 from the cooling water supply pipe 2 to the space 29 in the header 6 facing the cooling water supply pipe 2 with the slit nozzle 20 interposed therebetween. Has been. That is, a part of the cooling water supplied from the cooling water supply pipe 2 flows into the space 29 in the header 6 through the cooling water flow path 30 and flows into the slit nozzle 20 through the cooling water flow path 28. Note that the length of the header 6 in the longitudinal direction may be slightly longer than the length of the slit nozzle 20 in the longitudinal direction, and may be substantially the same length.

  The supply hole 5 of the cooling water supply pipe 2 is provided, for example, on the outer peripheral surface on the lower end side on the vertical center axis X of the cooling water supply pipe 2. The supply hole 5 may be formed at any position as long as it is an outer peripheral surface on the lower end side whose central angle α is within 45 degrees from the vertical central axis X of the cooling water supply pipe 2. In this case, the cooling water supplied from the supply hole 5 can flow to the outlet 8 without being retained in the header 6.

  According to this example, when the supply of the cooling water from the cooling water supply pipe 2 is stopped, the slit nozzle 20 is cooled from the both side surfaces 20a and 20b by the cooling water staying inside the header 6. Therefore, the cooling effect of the slit nozzle 20 can be improved. Further, while the cooling water is being supplied from the cooling water supply pipe 2, the cooling water passes through the space 29 facing the cooling water supply pipe 2 with the slit nozzle 20 interposed therebetween by the outlet 27, so that the slit nozzle The 20 side surfaces 20a and the side surfaces 20b can be cooled to the same temperature.

  Moreover, since the upper part of the slit nozzle 20 protrudes from the upper part of the header 6 and the inlet 24 of the slit nozzle 20 is located higher than the outlet 8 of the header 6, the cooling water supply of the cooling water supply pipe 2 is supplied. When the operation is stopped, the cooling water inside the header 6 is not discharged. Therefore, when the supply of the cooling water from the cooling water supply pipe 2 is stopped, the discharge of the cooling water from the discharge port 22 can be stopped immediately. In addition, since the cooling water stays inside the header 6 while the cooling water supply from the cooling water supply pipe 2 is stopped, the cooling water stays inside the header 6 when the cooling water supply is started again. The cooling water that is being swept away is discharged from the discharge port 22. Therefore, it is possible to supply the cooling water from the cooling water supply pipe 2 and immediately discharge the cooling water from the discharge port 22.

  For example, copper or a copper alloy may be used as the material of both side surfaces 20a and 20b of the slit nozzle 20 inside the header 6. By using copper or copper alloy having good thermal conductivity for both side surfaces 20a and 20b immersed in the cooling water, both side surfaces 20a and 20b of the slit nozzle 20 can be cooled more efficiently.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be made within the scope of the ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  The present invention is useful for a cooling device that cools a high-temperature steel material after heat treatment, for example.

It is a side view of the cooling device concerning this embodiment. It is the side view which looked at the cooling device of FIG. 1 from the AA direction. It is a longitudinal cross-sectional view of the BB direction of the cooling device of FIG. It is a side view of a cooling water supply pipe. It is a side view of a header. It is explanatory drawing which shows the position of the supply hole of a cooling water supply pipe. It is a longitudinal cross-sectional view of the cooling device explaining the position of the cooling water supply pipe with respect to the header. It is a side view of the cooling water supply pipe which changed the size of the supply hole of a cooling water supply pipe. It is a longitudinal cross-sectional view of the cooling device which has arrange | positioned the slit nozzle inside a header. It is the cross-sectional view which looked at the cooling device of FIG. 9 from CC direction. It is a longitudinal cross-sectional view of the conventional slit nozzle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Cooling water supply pipe 3 Opening part 5 Supply hole 6 Header 6a Side surface of the header in contact with the slit nozzle 8 Outflow port 9a Side surface of the slit nozzle in contact with the header 9 Slit nozzle 10 Tip portion 11 Discharge port 12 Rectifier 13 Inlet port 14 Block body 15 Cooling water flow path 20 Slit nozzle 20a Slit nozzle side surface (cooling water supply pipe side)
20b Side surface of slit nozzle (opposite side of cooling water supply pipe)
21 End portion 22 Discharge port 23 Rectifier 24 Inlet 25 Cover 26 Cooling water flow path 27 Outlet 28 Cooling water flow path 29 Space in header facing cooling water supply pipe across slit nozzle 30 Cooling water flow path α Center angle S Header Horizontal distance between the side surface 6a of the cooling water and the vertical central axis of the cooling water supply pipe T Horizontal distance between the side surface 6b of the header and the vertical central axis of the cooling water supply pipe X Vertical vertical axis of the cooling water supply pipe

Claims (8)

A cooling device that discharges cooling water to a steel material to cool the steel material,
A cooling water supply pipe having a cooling water supply hole;
A header that surrounds the cooling water supply pipe and has a cooling water outlet formed at the top;
A slit nozzle in which an inlet for cooling water flowing out from the outlet is formed in the upper part, and a slit-like outlet for discharging the flowing cooling water into the steel material is formed in the lower part,
A cooling water flow path connecting the outlet of the header and the inlet of the slit nozzle;
Have
At least a part of the side surface of the slit nozzle is in contact with the side surface of the header. The horizontal distance between the contact surface of the header that is in contact with the slit nozzle and the center of the cooling water supply pipe is the horizontal distance between the side surface of the header that faces the contact surface and the center of the cooling water supply pipe. The cooling device according to claim 1, wherein the cooling device is longer than the directional distance. 3. The cooling device according to claim 1, wherein side surfaces of the slit nozzle and the header that are in contact with each other are made of copper or a copper alloy. The cooling device according to any one of claims 1 to 3, wherein a vertical cross-sectional shape of the header is a quadrangle. A cooling device that discharges cooling water to a steel material to cool the steel material,
A cooling water supply pipe having a cooling water supply hole;
A header that surrounds the cooling water supply pipe and has a cooling water outlet formed at the top;
A slit nozzle in which an inlet for cooling water flowing out from the outlet is formed in the upper part, and a slit-like outlet for discharging the flowing cooling water into the steel material is formed in the lower part,
A cooling water flow path connecting the outlet of the header and the inlet of the slit nozzle;
Have
The slit nozzle is installed inside the header,
The cooling device according to claim 1, wherein a tip portion of the slit nozzle protrudes from a lower portion of the header. The cooling device according to claim 5, wherein the inlet of the slit nozzle is formed at a position equal to or higher than the outlet of the header. The cooling device according to claim 5 or 6, wherein a side surface of the slit nozzle in the header is made of copper or a copper alloy. The supply hole is formed on the outer peripheral surface on the lower end side with a central angle within 45 degrees from the vertical central axis of the cooling water supply pipe as seen from the vertical cross section of the cooling water supply pipe. The cooling device according to claim 1.

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