JPS6056207B2 - Cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device that can minimize the amount of cooling water that does not participate in cooling a material to be cooled and can inject water with uniform discharge pressure.

For example, when continuously hot-rolled hot strip is cooled on a run-out table, a cooling device as shown in FIGS. 1 to 3 has conventionally been used.

In other words, water is constantly supplied to the header pipe 3 at the maximum flow rate (see Figure 7) required under the cooling conditions of the hot strip to be cooled by continuous operation of the pump 1, and the presence or absence of water supply to each header pipe 3 depends on the number of zones used. Accordingly, the solenoid valve 2 is turned on and off,
Furthermore, the selection of water to be discharged from each nozzle 4 for controlling the winding temperature is carried out by operating the shield plate 5 while leaving the cooling water flowing as shown in detail in FIGS. 2 and 3. It is being said. That is, when discharging water, the shield plate 5 is connected to the nozzle 4 as shown in Figure 2.
When discharging water is stopped, the shield plate 5 is positioned below the nozzle 4 as shown in Fig. 3, and the water flow is directed to the left side of the gutter 6.
Flow inside. This type of cooling device was developed in
This is shown in Japanese Patent No. 9891. In the figure, 7 is a table roller, and 8 is a hot strip during cooling. Leaving a large amount of cooling water that does not participate in cooling in this way is
This is because frequent starting and stopping of the pump is difficult due to the characteristics of the pump, and the response of the pump's flow rate control is slow. The above conventional cooling system requires a pump with a large rated capacity, and the pump operates even when not cooling, discharging a large amount of water, and water is also discharged depending on the water discharge selection during cooling. As a result, equipment costs and electricity costs have increased, and a huge amount of water has been wasted.

On the other hand, an elevated tank system is also being considered, but in this system, the water level in the elevated tank changes depending on the amount of outflow, and the nozzle discharge pressure changes, so the coiling temperature is
It is difficult to control tur (winding temperature), and the life of the valve provided in the water supply pipe to the header pipe is short due to water hammer.

The purpose of this invention is to solve the above-mentioned drawbacks and provide a cooling system that minimizes the amount of water used. a water supply pump that supplies water to the water storage tank; a water storage water injection tank that has a large number of laminar nozzles equipped with water stop valves and is disposed on the cooling zone; and a water supply pipe that supplies water from the water storage tank to the water storage water injection tank; The cooling device includes a control valve that controls the flow rate of cooling water in the water supply pipe according to the water level in the water storage tank. The present invention will be described in detail below along with examples.

FIG. 4 is a diagram showing the entire control system, and FIGS. 5 and 6 are diagrams mainly showing the device configuration. In the drawing, reference numeral 9 denotes a pump that continuously operates to supply and store cooling water at a predetermined flow rate into the water storage tank 10. The water storage tank 10 has a large floor area and is arranged so that the difference in water level between the water storage tank 10 and the water injection tank 11 does not become large. 11 is a water storage tank provided on the cooling zone; 12 is a pipe that supplies cooling water from the water storage tank 10 to the water storage tank 11;
13 is a control valve installed in the middle of the pipe 12, and is a control valve installed in the middle of the pipe 12,
The flow rate is controlled to keep the water level within 1 at a controlled value.

The water storage water injection tank 11 has the function of storing water and supplying water to the nozzles, and has a large number of slit nozzles 14 provided on its bottom surface, and each slit nozzle 14 is equipped with a water stop valve 15. ing.

The lifting and lowering operation of this water stop valve 15 is performed by, for example, a pressure cylinder (
(not shown). Reference numeral 16 denotes a partition plate provided in the water storage tank 11, which allows water to be supplied from the pipe 12 to the water storage tank 11.
Installed when there is a risk of turbulence in the cooling water.

5 and 6, 17 is a slit nozzle 14
The slit laminar flow flowing out from 7 and 8 is the first
The table roller and hot strip are shown as in the figure. Returning to Figure 4, 18 is the water level gauge 19 of the water tank 10.
20 is a control device consisting of a water level gauge for the water storage water injection tank 11, and an electronic computer, which issues selective opening/closing commands to each water stop valve 15, and also commands the operation of the control valve 13 based on the signal from the water level gauge 19. put out. In addition, in FIG. 5, 23 indicates a lower cooling device. The configuration of the embodiment of the present invention is as described above, and first, water is supplied to the water tank 10 in the following manner. That is, as shown in FIG. 7, the amount of cooling water 21 required for one cooling is supplied to the water storage tank 10 during the total time of the previous water injection and non-cooling. (Amount of water required for cooling 21 = Amount of water stored 22) This water supply control can be easily performed, for example, by combining the selective use of three pumps 9 and the selection of the rotation speed of one pump, as shown in FIG. can. As a result, only the amount of water necessary for cooling is supplied by the pump, and wasteful discharge of cooling water is avoided. Next, water storage tank 11
It is extremely important to always maintain the water level within the coil at a predetermined value for controlling the winding temperature of the hot strip.

In the present invention, water is stored so that the water level in the water storage tank 11 reaches a predetermined value by measuring the water level in the water storage tank 11 whose water level changes with the water level gauge 19 and operating the control valve 13 according to the water level. The cooling water in the tank 10 is supplied to the water storage tank 11. Furthermore, the selection of water injection from the slit nozzles 14 is performed by the water stop valves 15 provided on each slit nozzle, so when conventional cooling water is continuously discharged and selected using the shield plate method (Figures 2 and 3). There is no wasted use of cooling water compared to the previous model.

Furthermore, since the water storage water injection tank 11 also has the function of a water storage tank that supplies water to the nozzle 14 at a predetermined pressure, the equipment cost is lower and the space is smaller than when this function is provided separately, which reduces space constraints. Less is.

Other embodiments of the present invention are shown in FIGS. 8 to 10.

In this embodiment, instead of the water storage water injection tank 11 of the above embodiment, a plurality of pipe laminar nozzles 24 are connected to the water storage tank 1 through a water stop valve 15'' to constitute a water storage water injection tank. There is no difference from the above embodiment.

The pipe lamina nozzle 24 has a nozzle 25 as shown in FIG.
Rectified water flows down. Therefore, in this example as well, the ON-OFF operation of the water stop valve 15'' is performed in the same way as in the previous embodiment. However, in this example, the laminar pipe nozzle 24 is placed outside the water tank 1''. Since we will install
That requires extra space. As described in detail above, the cooling device of the present invention can effectively avoid wasteful consumption of cooling water that is not involved in cooling the coolant, and is particularly effective when applied to cooling hot strips.

[Brief explanation of the drawing]

1 to 3 show a conventional cooling device, in which FIG. 1 is an overall explanatory diagram, FIG. 2 is an explanatory diagram of a water injection state, and FIG. 3 is an explanatory diagram of a non-water injection state. 4 to 6 show embodiments of the present invention, FIG. 4 is a system diagram, FIG. 5 is an explanatory diagram of the device configuration, and FIG. 6 is a detailed explanatory diagram of a water storage tank. FIG. 7 is an explanatory diagram of a water supply pattern to a water tank in the cooling device of the present invention. Figures 8 to 10
The figures show other embodiments of the present invention; FIG. 8 is a side view of the device configuration, FIG. 9 is a plan view, and FIG. 10 is an enlarged view taken along the line A--A in FIG. 8. 9...Pump, 10...
・Water tank, 11... Water storage tank, 12...
・Water supply pipe, 13... Water supply control valve, 14...
...Laminar nozzle, 15...Water stop valve.

Claims (1)

[Claims] 1. A water storage tank that stores cooling water, a water supply pump that continuously operates to supply the required amount of water for unit cooling to the storage tank, and a large number of laminar nozzles equipped with water stop valves, and is located above the cooling zone. A cooling device comprising: a water injection tank; a water supply pipe that supplies water from the water storage tank to the water injection tank; and a control valve that controls a flow rate of cooling water in the water supply pipe according to a water level in the water storage tank.