JPH0810822A - Spraying nozzle - Google Patents

Abstract

PURPOSE:To obtain a spraying nozzle having high controllability of a cooling range and cooling timing of spraying water and excellent responsiveness of cooling water injection by integrally mounting an automatic water flow stop valve to the cooling water supply side of a spraying nozzle body. CONSTITUTION:Since the automatic water flow stop valve is integrally mounted at the cooling water supply side of the spraying nozzle body 3, the distance between an on-off valve and the spraying nozzle 3 is shortened and not much time is spent any more for operation of the on-off valve at the time of starting or stopping the cooling water injection and before the actual injection. Abolishment of a makeup water system is made possible and, therefore, spraying of the water to steel products at the time of non-cooling does not arise any more and consequently, the controllability of the range where the spraying water is applied on the surfaces to be cooled and the spraying timing is enhanced and uniform cooling is made possible. Since the spraying nozzle body 3 is provided with a flow regulator for the cooling water, the stability of the water flow is assured and the cooling effect is additionally enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle, and more particularly to a structure of a spray nozzle effective for cooling a steel material placed such that a surface to be cooled is vertical to the ground.

[0002]

2. Description of the Related Art Generally, when a steel material having a complicated cross-sectional shape such as H-section steel is manufactured by hot rolling, the temperature difference in the cross-section due to the difference in wall thickness of each cross-section causes bending or buckling after cooling. It is known that the defective shape is caused. Therefore, in order to prevent this defective shape, for example, after the hot rolling, the thick H-section steel flange portion is forcibly cooled from the outside to make the temperature distribution in the section of the section steel uniform. The nozzle used to perform the cooling is called a spray nozzle because it sprays a cooling medium such as water, and due to the difficulty of cooling, those having various structures have been researched and developed and put into practical use. ing. For example, FIG. 3 is an example of spray nozzle cooling presented at the Iron and Steel Institute lecture meeting,
Cooling water 4 is sprayed onto an H-shaped steel 2 placed so that the flange outer surface 1 is vertical to the ground by spraying a cooling water 4 from a spray nozzle 3 provided at a position facing the H-shaped steel 2.

By the way, the spray nozzle 3 shown in FIG.
Two cooling water supply passages called a cooling water system 5 and a makeup water system 6 are provided, and the cooling water is sent to the spray nozzle 3 via a water supply header 7 in the middle. Also,
The makeup water system 6 is connected to the cooling water system 5 via a cooling water check valve 16, while the cooling water system 5 is provided with a so-called ON-OFF valve 8 for shutting off or passing the cooling water. There is. In consideration of the convenience of the following description, the injection pressure of the cooling water system 5 is Ps and the pressure of the makeup water system is Pa.

Since the spray nozzle 3 has the injection pressure Ps> the makeup water system pressure Pa when the cooling water is flowing, that is, while the cooling water is being sprayed, the check valve 2 causes the spray nozzle 3 to discharge the makeup water from the makeup water system 6. The water supply is cut off. On the other hand, when the cooling water is stopped, that is, while the cooling water spray is stopped, the injection pressure Ps = 0, so the injection pressure Ps <the makeup water system pressure Pa, and the water is supplied from the makeup water system 6 to the cooling water system 5. Will be supplied. Therefore, this spray nozzle 3
Even when the cooling water is stopped, the space between the ON-OFF valve 8 and the spray nozzle 3 can be always filled with water because the makeup water system 6 is provided. It is expected to shorten the time required to discharge, that is, improve the responsiveness.

However, since the makeup water is constantly supplied, there is another problem caused by the fact that a small amount of makeup water is constantly sprayed from the spray nozzle 3. The injection pressure to obtain a normal spray pattern is 100 to 500 kpa
Although necessary, the supply pressure of make-up water is not sufficient, and only linear water is sprayed. Therefore, when the above-mentioned spray nozzle of FIG. 3 is adopted in the flange water cooling equipment of the H-section steel 2, even if the steel material that does not require water cooling passes or the water passes through the water cooling device when water cooling is not performed, As a result, partial cooling is performed by the makeup water, which rather forms a non-uniform temperature distribution in the steel material, causing warpage in the product longitudinal direction and warpage of the flange portion. Also,
Even if the makeup water is always supplied from the ON-OFF valve 8 to the spray nozzle 3, the spray nozzle 3 does not normally eject only the makeup water, so the spray nozzle 3
Due to a slight installation error, the air reversely invades from a part of the spray nozzle 3 provided in the water supply header 7, and a response time at the start of injection is required to be about 2 to 5 (sec). Then, it cannot be said that the responsiveness is always good.

[0006]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a spray nozzle which has a high controllability of a cooling range and a cooling timing of spray water and an excellent responsiveness of cooling water injection. .

[0007]

In order to achieve the above-mentioned object, the inventor has reviewed the entire cooling system using a conventional spray nozzle, and made it clear that water is sprayed on a steel material when the makeup water system is abolished and cooling is not performed. Avoid, and ON-OFF
It was investigated that the cooling water stopped or the responsiveness of injection improved when the valve was operated. At that time, it is also noticed that the upstream pipe of the spray nozzle secures a straight pipe portion of about 10 to 20 times the pipe diameter to stabilize the water flow supplied to the spray nozzle to ensure the accurate spray pattern formation. It was However, the flange water cooling device for H-section steel, etc. is used in the extremely narrow and limited space in the side guide of the rolling line.
Since a spray nozzle must be placed, there is no room to secure the above straight pipe section, and especially when installing an elbow etc. immediately before the spray nozzle, install a separate rectifier inside the nozzle to stabilize the water flow. In addition, in order to increase the thickness of the spray pattern, since a means for rectifying a constant flow before the orifice inside the nozzle to generate a constant flow is used, a straight pipe portion of about 10 to 20 times the pipe diameter is used. The present invention has been completed, focusing on the need to provide a rectifier inside the spray nozzle when there is no such a case.

That is, the present invention is a spray nozzle characterized in that an automatic water flow shutoff valve is integrally attached to the cooling water supply side of the spray nozzle body. Also, the present invention
A spray nozzle according to claim 1, wherein the spray nozzle body is provided with a rectifier of cooling water. In this case, it is advantageous that the internal volume of the automatic water flow shutoff valve is as small as possible in order to improve the responsiveness.

[0009]

In the present invention, since the automatic water flow shutoff valve is integrally attached to the cooling water supply side of the spray nozzle body,
The distance between the ON-OFF valve and the spray nozzle is shortened, and it takes no time to operate the ON-OFF valve and the actual injection when the cooling water injection is started or stopped. Also, since the makeup water system can be abolished,
No water is sprayed onto the steel material during non-cooling, and as a result, the controllability of the spray water range and spray timing on the surface to be cooled is enhanced, and uniform cooling is possible. Further, in the present invention, since the spray nozzle main body is provided with the cooling water rectifier, the spray nozzle according to claim 1, so that the stability of the water flow is assured and the above effects are further promoted. become.

The contents of the present invention will be described below with reference to FIGS.

[0011]

EXAMPLE FIG. 1 shows an example of a spray nozzle 3 according to the present invention when the cooling water 4 is not sprayed. As shown in FIG. 1, it includes a spray nozzle body 3 and
The automatic water flow shutoff valve 9 is formed, and the automatic water flow shutoff valve 9 is integrally attached to the cooling water supply side of the spray nozzle body 3. The automatic water flow shutoff valve 9 integrally provided on the upstream side in the immediate vicinity of the nozzle body 3 includes a valve body 10, a case 11, a spring 12, and a cooling water inlet 13.

FIG. 2 is a view showing the action of each component when the cooling water 4 is jetted using the spray nozzle 3 according to the present invention shown in FIG. As is clear from FIG. 2, the valve body 10
The sealing surface b is formed in a tapered shape and is pressed against the sealing surface c of the case 11 by the force of the spring. Further, the valve body 10 is configured so as to be slidable on the two surfaces f and g with respect to the case 11, and when the pressure of the supply water increases, the valve body 10 is pressed by the pressure from the direction a as shown in FIG. 10 moves to the tip side of the nozzle 3, and the stopper portion d of the valve body 10 and the portion indicated by e of the case come into contact with each other so that the opening degree of the valve body 10 can be maintained constant.

In actual use, with respect to the injection pressure Ps of the cooling water, the opening operation starting pressure Po, the valve element full opening pressure P1,
The pressure loss Pr was set as follows. Injection pressure: Ps (= 150 kpa) () is the value of the actual machine Opening operation starting pressure: Po = 0.2 x Ps (= 30 kpa) Full valve opening pressure: P1 = 0.5 x Ps (= 75 kpa) Pressure loss: Pr = 0.2 × Ps (= 30 kpa) By setting the pressure as described above, the automatic water flow shutoff valve 9
When the ON-OFF valve 8 is opened, the cooling water automatically flows, and when the valve body is closed, the pressure inside the pipe becomes higher than the atmospheric pressure by about 30 kpa, and the invasion of air into the pipe can be prevented.

In FIGS. 1 and 2, the spray nozzle main body 3 is provided with a rectifier 14 and a flow regulator 15 from the cooling water supply side.
It has. However, in the present invention, since the valve body 10 is hollowed and used as a water passage inside the valve body 10, the valve body 10 itself can have a rectifying function, and the rectifier 14 is omitted. Was also successful. The results when the spray nozzle according to the present invention is applied to the cooling of the H-shaped steel flange portion are shown in Table 1 in comparison with the case of the conventional spray nozzle. From Table 1, it is clear that the responsiveness of the spray nozzle according to the present invention is excellent.

In this embodiment, the spray nozzle used for cooling the H-section steel flange has been described, but the present invention is not limited to this, and the spray nozzle used for various cooling objects (including other than steel materials). May be applied to.

[0016]

[Table 1]

[0017]

As described above, according to the present invention, ON
Since the response time from the opening command of the -OFF valve to the actual injection of cooling water can be shortened and the makeup water system can be abolished, uniform cooling of the steel material is further improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a spray nozzle according to the present invention, showing a state when cooling water is stopped.

FIG. 2 is a vertical cross-sectional view of a spray nozzle according to the present invention, showing a state in which cooling water is passed.

FIG. 3 is a diagram showing an entire cooling device for cooling a spray nozzle used for cooling a conventional section steel.

[Explanation of symbols]

 1 Flange Outer Surface 2 H-Shaped Steel 3 Spray Nozzle or Spray Nozzle Body 4 Cooling Water 5 Cooling Water System 6 Makeup Water System 7 Water Supply Header 8 ON-OFF Valve 9 Automatic Water Flow Stop Valve 10 Valve Body 11 Case 12 Spring 13 Cooling Water Inlet Port 14 Rectifier 15 Constant current device 16 Check valve 17 Open / close valve

Claims (2)

[Claims] 1. A spray nozzle characterized in that an automatic water flow shutoff valve is integrally attached to the cooling water supply side of the spray nozzle body. 2. The spray nozzle according to claim 1, wherein the spray nozzle body is provided with a rectifier of cooling water.