JPH0543864Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a device for removing scale generated on the surface of hot-rolled steel plates, etc., and a pressurized water injection system used for cooling rolling rollers in steel plate rolling equipment. Concerning nozzle improvement technology.

(Prior Art) Conventionally, as a scale removal device for removing scale (oxide film) generated on the surface of a steel plate or the like manufactured by hot rolling, a device as shown in FIG. 12 is known.

This scale removal device B has a large number of injection nozzles n disposed above and below a line in which rolled steel plates, etc. This system uses the force of high-pressure water (100 to 200 kg/cm) to remove scale generated on the surface of steel plates, etc. In this case, the pressure water passes through the main valve 100 and the main pipe 101 to the injection nozzle n.
However, if the main valve 100 (spool valve) is closed and the water supply is stopped at the end of the work, the injection nozzle n
Air enters the main pipe 101 from the injection port,
After that, when the main valve 100 is opened and water supply starts,
A water hammer phenomenon occurs in which the air in the main pipe 101 is rapidly compressed and then rapidly expanded, resulting in an accident in which various parts burst or break.

Therefore, as a method to prevent this accident, conventionally, as shown in FIG. 12, an auxiliary pipe 102 is provided that bypasses the main valve 100, and a pressure reducing device 103 interposed in the flow path of this auxiliary pipe is used to lower the pressure. A method has been adopted in which water (30 kg/cm) is constantly supplied to the main pipe 101 and this low-pressure water is dripped from each injection nozzle n to prevent air from entering.

However, this conventional method not only wastes water when it is allowed to flow, but also has the disadvantage that the water continues to flow even during work that does not require the injection of pressurized water, adversely affecting the product and causing a decrease in product quality.

To solve this problem, there is a pressure water injection nozzle valve (Utility Application No. 58-23615) filed by the present applicant.

This pressure water injection nozzle valve has inside the injection nozzle,
A piston valve that opens and closes the flow path is provided, and a spring member that always biases the piston valve in a direction to close it is provided, and the piston valve receives the pressure of pressurized water to cause the piston valve to be pushed by the spring member. It has a pressure-receiving surface that operates in the direction of opening against pressure. Therefore, by using this pressure water injection nozzle valve, when pressurized water is supplied, the piston valve is automatically opened by the supply water pressure. In addition, when the supply of pressurized water is stopped, the piston valve can be automatically closed by a spring member, so that the inflow of air can be prevented without constantly dripping water.

(Problems to be Solved by the Invention) However, the conventional pressure water injection nozzle valve also has the following problems.

That is, in the conventional pressure water injection nozzle valve,
If the flow path from the valve port to the injection port is short, the pressure water that is injected from the injection port is affected by the turbulence that occurs when the pressure water is throttled at the valve port and flows into the flow path. There was a problem with the pattern breaking down. However, the length of the flow path is equal to the inner diameter of the flow path.
If you make it 10 times longer, the effect of turbulence will disappear, but
On the other hand, the compactness of the product is greatly sacrificed, and as the front length becomes longer, it becomes necessary to correct the positional relationship of the main piping.

(Means for solving the problem) The present invention was made with the aim of solving the above-mentioned problems, and in order to achieve this purpose, the present invention has a flow path from the inlet to the injection port. A nozzle body has a cylinder hole formed therein, the inner bottom side of which communicates with the atmosphere, and a valve seat formed on the downstream side where the cylinder hole opens with a valve port communicating with the injection port, and a poppet on the downstream side. a piston valve having a piston portion formed thereon and a piston portion slidably fitted into the cylinder hole on the upstream side; a spring member that closes the flow path with a spring member, and a spring member is provided between the piston portion and the poppet portion that receives the water pressure of pressurized water supplied into the flow path to cause the piston valve to resist the pressing force of the spring member. A pressurized water injection nozzle is provided with a pressure-receiving surface that operates in the direction of opening the flow path, and the flow path on the injection port side is provided with a required length in the flow path between the valve port and the injection port. The configuration was such that a current plate was provided while the current was left in place.

(Function) Therefore, in the pressure water injection nozzle of the present invention, the rectifying plate is provided in the flow path between the valve port and the injection port, leaving the required length of the flow path on the injection port side. ,
By lengthening the flow passage by the length of the rectifier plate, it is possible to prevent the jet pattern from collapsing due to the influence of turbulence.

Moreover, in the pressure water injection nozzle of the present invention, the piston valve is automatically opened by the supply water pressure when pressure water is supplied, and the piston valve is automatically closed by the spring material when the supply of pressure water is stopped. This makes it possible to prevent air from flowing in without constantly dripping water.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment will be explained.

The pressure water injection nozzle A of this embodiment is shown in Figs.
As shown in FIG. 10, a holder 1, a nozzle body 2, a piston valve 3, a spring member 4, a body nut 5,
The main components include a nozzle head 6 and attachment means 7.

The holder 1 is for detachably attaching the nozzle body 2 to the main pipe P, and is formed into a substantially cylindrical shape, as shown in FIGS. 1, 3, and 7. The small diameter portion 10 formed on the upstream side is welded while being fitted into the communication hole p opened in the main pipe P, and a male thread 11 for screwing the body nut 5 is formed on the outer peripheral surface on the downstream side. An engagement hole 12 for connecting and positioning the nozzle body 2 is formed on the downstream inner peripheral surface, and an annular step 13 for mounting the gasket G is formed on the downstream opening end surface.

As shown in FIGS. 1 and 8, the nozzle body 2 is formed into a substantially cylindrical shape by a water supply pipe portion 20 and a valve body portion 21.

The water supply pipe portion 20 is formed into a cylindrical shape with a rectangular outer shape, and is inserted in a non-rotatable state into the connection positioning engagement hole 12 formed on the downstream inner peripheral surface of the holder 1 shown in FIG. (See Figure 3).

Further, the upstream opening of the water supply pipe section 20 serves as an inlet 8 for supplying pressurized water, and the inner peripheral surface of the inlet 8 is formed with a female thread 80 for screwing the strainer S. A substantially conical opening 20a is formed on the side, and an inflow path 20b from the inlet 8 to the opening 20a is formed.

The valve main body part 21 is formed in a cylindrical shape, and a bottomed hole 22 that opens toward the downstream side is formed in the center part of a partition wall 21a formed on the upstream side. A spring receiver 50 which also serves as a stopper on the opening side of the piston valve 3 shown in FIG.
A cylinder portion 23 shown in FIG. 9 is fitted into the large-diameter hole 22b on the opening side of the cylinder in a watertight manner with an O-ring O, and a cylinder hole 24 is provided in a penetrating state inside this cylinder portion 23. ing.

This cylinder part 23 is formed integrally with a piston guide part 25 as shown in FIG. As shown in FIG. 1, the flange portion 25b protruding from the valve body 21 is attached to the downstream opening end surface of the valve body 21 via the gasket G. Also,
A valve head portion 27 having a valve seat 27b on the upstream side of a valve port 27a is integrally provided on the downstream end face of this piston guide portion 25 by welding, and a nozzle head 6 is provided at the lower part of this valve head portion 27. ing.

As shown in FIGS. 5, 8, and 9, a rectangular protrusion 28 for positioning is formed on the outer peripheral surface of the piston guide portion 25, and a rectangular protrusion 28 is formed on the outer peripheral surface of the piston guide portion 25. A rectangular groove 29 for positioning is formed on the inner peripheral surface of the downstream opening of the portion 21 .

Further, as shown in FIGS. 6 and 9, a guide hole 25c is formed in the center of the piston guide portion 25, and a plurality of guide holes ( In the embodiment, six communication holes 25d are provided, and the hollow portion 26 and the valve port 27a communicate with each other through the communication holes 25d.

Further, as shown in FIGS. 4 and 8, a plurality of (eight in the embodiment) communicating holes 21b are provided at regular intervals on the outer circumference of the partition wall 21a of the valve body 21.
As shown in FIG. 1, the communication hole 21b allows the downstream conical opening 20a of the water supply pipe section 20 and the hollow section 26 of the valve body section 21 to communicate with each other. A conical protrusion 21c for distributing pressure water is provided at the center of 21a to protrude toward the conical opening 20a of the water supply pipe section 20.

Further, as shown in FIGS. 4 and 8, an air hole 22c is provided in the partition wall 21a for communicating the inner part side of the cylinder hole 24 with the atmosphere, and a filter is provided in the air hole 22c. device 22d
are removably screwed together.

As shown in FIGS. 1 and 9, the piston valve 3 includes a piston portion 31 on the upstream side of a poppet portion 30 having a conical valve portion 30a formed on the downstream end surface. A spring receiving hole 31a is formed in the side end surface. In this piston valve 3, the piston portion 31 is slidably inserted into the cylinder hole 24, and the space between the piston portion 31 and the cylinder hole 24 is maintained in a watertight state by an O-ring O, and the poppet The portion 30 is slidably inserted into the guide hole 25c of the piston guide portion 25.

Further, a pressure receiving surface 32 facing the downstream side is provided between the poppet portion 30 and the piston portion 31, which is formed by a difference in diameter between the poppet portion 30 and the piston portion 31.

As shown in FIGS. 1 and 9, the spring material 4 is a member that constantly presses the valve portion 30a of the piston valve 3 in a direction in which it comes into pressure contact with the valve seat 27b. A coil spring is used, and the spring member 4 made of the coil spring is inserted into the spring receiver 5 in the cylinder hole 24.
0 and the spring receiving hole 31a of the piston portion 31 in a slightly compressed state.

The body nut 5, as shown in FIG.
This is an attachment means for attaching the above-mentioned nozzle body 2 to the holder 1 in a removable state, and an annular engagement part 40 protruding from the inner circumference of the downstream opening is attached to the outer circumference of the valve body 21. While engaged with the protruding annular engagement portion 21d, the female thread 41 formed on the inner peripheral surface of the upstream opening is screwed into the male thread 11 formed on the downstream outer peripheral surface of the holder 1 and tightened. As a result, the downstream opening end surface of the holder 1 and the upstream end surface of the annular engaging portion 21d of the valve body 21 are connected in a watertight manner by the gasket G.

The nozzle head 6 is integrally provided on the downstream side of the valve head portion 27, and is a second nozzle head.
As shown in FIG. 9 and FIG. 9, it is formed into a substantially cylindrical shape, and a flange 60 is provided on the outer peripheral surface on the upstream side, and an elliptical injection nozzle is formed by an injection nozzle 61 provided at the downstream opening. 62 is formed, and an elliptical injection port 6 is formed on the opening end surface of the injection port 62.
By providing grooves 63 for forming an injection pattern along the longitudinal direction of the grooves 2, the pressure water injected from the injection port 62 is spread in a fan-like manner in the direction in which the grooves 63 are provided.

Further, a step portion 66 for locking the rectifier plate 65 is formed at approximately the middle portion of the flow path 64 that communicates between the lower end injection port 62 and the valve port 27a.
The length of the upper flow passage is approximately 2.5 times the inner diameter of the flow passage, and the length of the flow passage lower than the stepped portion 66 is approximately three times the inner diameter of the flow passage. A rectifying plate 67 is installed in the flow path above the step portion 66.

This rectifier plate 65 is for calming the turbulent flow that occurs when the pressure water is throttled by the valve port 27a and flows into the flow passage 64 in a short distance, and in this embodiment, as shown in FIG. A structure having three radially arranged vanes 65a is used.

The attachment means 7, as shown in FIG.
Means for detachably attaching the nozzle head 6, valve head portion 27 and piston guide portion 25 to the valve body portion 21,
In this embodiment, a union nut 70 is used.

As shown in FIG. 1, this union nut 70 has an annular engaging portion 70a protruding from the inner circumferential surface of the downstream opening engaged with the flange 60 of the nozzle head 6, and the union nut 70 is attached to the circumferential surface of the upstream opening. By screwing and tightening the female thread 70b formed on the outer circumferential surface of the downstream opening of the valve body 21 to the male thread 21e formed on the outer circumferential surface of the downstream opening of the valve body 21, the downstream opening end surface of the valve body 21 and the piston guide are connected. 25 is connected to the flange portion 25b by a gasket G in a watertight manner.

As shown in FIG. 2, the groove direction of the jet pattern forming groove 63 provided on the opening end surface of the nozzle head 6 is about 15 mm from the long side direction of the connection positioning engagement hole 12. It is formed in an offset position. This is to shift the spray directions so that the pressure water sprayed in a fan shape from each pressure water spray nozzle A, A does not interfere with each other.

Next, the operation of this embodiment will be explained separately for when pressure water is supplied and when pressure water supply is stopped.

(a) When supplying pressure water First, when pressure water is supplied to the main pipe P, this pressure water passes through the strainer S and is supplied into the inlet 8 of the water supply pipe section 20, and also from the inlet passage 20b. through the conical opening 20a and then through the valve body 2
The water pressure of the pressurized water flowing into the hollow part 26 through each of the communication holes 21b of 1 acts on the pressure receiving surface 32 formed in the piston valve 3 and facing the downstream side. The piston valve 3 is attached to the spring material 4
, the valve portion 30a separates from the valve seat 27b and the valve opening 2
7a automatically opens, and therefore the pressure water in the hollow part 26 flows through the communication hole 25d, the valve port 27a, and the flow path 6.
4 and is diffused and sprayed outward from the injection port 62 of the nozzle head 6 in a fan shape, and by this injection force, as shown in FIG. 11, scale generated on the surface of the steel plate H etc. is removed. .

In this case, the pressure water throttled by the valve port 27a flows through the rectifying plate 65 provided in the flow path 64.
The flow is immediately rectified by the flow path 64, and in the process of passing through the flow path 64 below the stepped portion 66, the flow is further stabilized and is injected from the injection port 62, so that a desired injection pattern can be obtained. Become.

(b) When pressurized water supply is stopped Next, when the supply of pressurized water to the main pipe P is stopped, the pressure of the pressurized water in the hollow part 26 decreases rapidly, and the pressure of the pressurized water that had been acting on the pressure receiving surface 32 until then flows to the upstream side. Since the pressing force of the piston valve 3 is removed, the piston valve 3 is pushed down to the downstream side by the repulsive force of the spring member 4, and the valve portion 3
0a is pressed against the valve seat 27b to open the valve port 27a.
will be automatically closed.

As explained above, in the pressure water injection nozzle A of the embodiment, the flow path 64 on the injection port 62 side is provided in the flow path 64 between the valve port 27a and the injection port 62.
By providing the rectifying plate 65 with the required length of the rectifying plate 65 remaining, it is possible to prevent the jet pattern from collapsing due to the influence of turbulence by lengthening the flow path 64 by the length of the rectifying plate 65. .

Also, in the pressure water injection nozzle A of the present invention, the piston valve 3 is automatically opened by the supply water pressure when pressure water is supplied, and the piston valve 3 is automatically opened when the supply of pressure water is stopped.
Since it can be automatically closed by the spring material 4, it is possible to prevent air from flowing in without constantly dripping water.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, in the embodiment, three
Although a structure having two vanes is shown, the number and specific shape of the vanes are arbitrary.

(Effects of the invention) As explained above, in the pressure water injection nozzle of the invention, a required length of the flow path on the injection port side is left in the flow path between the valve port and the injection port. By providing a rectifying plate in this state, it becomes possible to prevent the injection pattern from collapsing due to the influence of turbulence by lengthening the flow path by the length of the rectifying plate.

Moreover, in the pressure water injection nozzle of the present invention, the piston valve is automatically opened by the supply water pressure when pressure water is supplied, and the piston valve is automatically closed by the spring material when the supply of pressure water is stopped. As a result, it is possible to prevent the inflow of air without constantly dripping water.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing the pressure water injection nozzle according to the embodiment of the present invention, Fig. 2 is a bottom view of the same, and Fig. 3 is the first
Figure - Cross-sectional view by line, Figure 4 is Figure 1 -
5 is a cross-sectional view taken along the line in FIG. 1, FIG. 6 is a cross-sectional view taken along the line in FIG. 1,
Fig. 7 is an enlarged sectional view of the holder, Fig. 8 is an enlarged sectional view of the nozzle body, Fig. 9 is an enlarged sectional view of the piston valve portion, Fig. 10 is an enlarged perspective view of the rectifying plate, and Fig. 1
FIG. 1 is an explanatory diagram of the state of use, and FIG. 12 is an explanatory diagram showing a conventional scale removing device. 2... Nozzle body, 3... Piston valve, 4...
Spring material, 7... Attachment means, 8... Inflow port, 2
4...Cylinder hole, 27...Nozzle head part,
27a...Valve port, 27b...Valve seat, 30
...Poppet part, 30a...Valve part, 31...Piston part, 32...Pressure receiving surface, 62...Injection port, 64
... Flow path, 65 ... Current plate.

Claims (1)

[Claims for Utility Model Registration] A cylinder hole is formed in the flow path from the inlet to the injection port, the inner bottom side of which communicates with the atmosphere, and a valve that communicates with the injection port is provided on the downstream side where the cylinder hole opens. a nozzle body forming a valve seat with a mouth; a piston valve having a poppet portion formed on the downstream side and a piston portion slidably fitted into the cylinder hole on the upstream side; and the piston valve. a spring member that closes the flow path by constantly pressing the valve portion of the valve in the direction of pressure contact with the valve seat, and a pressure that is supplied to the flow path between the piston portion and the poppet portion; A pressure water injection nozzle formed with a pressure receiving surface that operates a piston valve in a direction to open a flow path against the pressing force of the spring material in response to the water pressure of water, wherein A pressure water injection nozzle characterized in that a rectifying plate is provided in a flow passage between the two, leaving a required length of the flow passage on the injection port side.