KR102193927B1 - Rotational fire fighting nozzle for heli-deck - Google Patents

Abstract

The present invention relates to a rotary fire extinguishing nozzle for a helideck, and more particularly, is installed in a recessed state on the helitech, and is pop-up by the water pressure of the fire extinguishing water supplied at the time of fire suppression and rotates. It relates to a fire extinguishing nozzle for watering.
The present invention is formed in a hollow cylindrical shape with the upper and lower surfaces of the open, the body portion 10 fixed on the helideck to communicate with the water supply pipe supplying fire extinguishing water; A plurality of through-holes 24 are provided inside the body part 10 to pass through the fire extinguishing water introduced into the body part 10, and a plurality of piston tip grooves ( 26) the piston part 20 is formed; And the lower portion is installed in engagement with the upper portion of the piston part 20, and the fire extinguishing water passing through the plurality of through holes 24 generates a predetermined rotational force and is sprayed to the outside at the upper end. It is possible to provide a rotating fire extinguishing nozzle for a helideck including a nozzle part 30 having a plurality of notches 34 formed thereon.

Description

Rotary fire fighting nozzle for heli-deck {ROTATIONAL FIRE FIGHTING NOZZLE FOR HELI-DECK}

The present invention relates to a rotary fire extinguishing nozzle for a helideck, and more particularly, is installed in a recessed state on the helitech, and is pop-up by the water pressure of the fire extinguishing water supplied at the time of fire suppression and rotates. It relates to a fire extinguishing nozzle for watering.

In general, commercial ships such as large container ships and crude oil tankers, or offshore plants such as drill ships and FPSO (Floating, Production, Storage and Offloading), etc. Because it stays or moves in, it is required to operate a helicopter as an efficient and rapid means of transport for moving crew or materials.

Accordingly, for ships and offshore structures, a helideck is installed at the fore or stern for takeoff and landing of the helicopter, and the helicopter takes off and lands using the helideck.

Here, the helideck can be largely composed of a pancake that forms a deck floor on which helicopters take off and land, and a pancake support that supports the pancake, and the pancake is composed of a plurality of planks, which are aluminum extrusions of trapezoidal cross section. It is a take-off and landing surface formed by being connected to each other, while other heli-deck accessories such as lighting facilities are installed, while the pancake support is a support structure under the pancake, which extends long in the direction intersecting the extension direction of the flank and is arranged on the lower side of the flank. It may include a plurality of supporting aluminum H beams, and a plurality of steel H beams that are elongated in a direction crossing the extension direction of the aluminum H beam and are disposed under the aluminum H beam to support the aluminum H beam. .

On the other hand, when a helicopter takes off and lands on the helideck, if an accident occurs, there is a possibility that a fire may be caused to the helideck by the oil leaked from the helicopter or the helicopter.

In this case, the safety of the pilot must first be ensured, and rapid fire suppression is required to prevent an explosion or fire from being transferred to a ship or offshore structure. Therefore, in the event of a fire, the area around the helideck should be extinguished as quickly as possible. Fire disaster prevention devices should be installed so that they can be extinguished.

Helideck's fire prevention system is largely divided into FMS (Fixed Monitor System) and DIFFS (Deck Integrated Fire Fighting System), of which DIFFS is a nozzle such as a sprinkler placed on the ground in the helitech area, that is, a pancake part. Extinguishing agents such as fresh water, sea water or foam are sprayed through the air.

Conventional nozzles were installed in a state exposed to the top of the pancake for smooth spraying of digestive liquid, but when the helicopter lands, it may be damaged or broken due to a collision with the wheels or skids of the helicopter. Korean Patent No. 10-1523915 discloses a technique related to a concave fire-fighting nozzle device of a helideck, and there is a problem in that the fire extinguishing area is narrow compared to the flow rate consumed when water is sprayed, and the fire extinguishing range is low under the same conditions.

In order to solve this problem, Korean Patent No. 10-1533759 discloses a technology related to a fire extinguishing nozzle for a helideck that is closed in the deck during normal operation and then popped up with water pressure during operation, and the spray tip rotates and sprays water. However, when the flow rate control of the water flowing into the piston through the water supply pipe is not smooth, there is a problem that the nozzle part may become fixed to the piston part and cannot be rotated.

Republic of Korea Registration License Publication No. 10-1523915 (2015.05.22.) Republic of Korea Registration License Publication No. 10-1533759 (2015.06.29.)

The present invention was conceived to solve the above problems, and an object of the present invention is to be installed in a state that is recessed on the helitech, and by making it pop-up by the water pressure of the extinguishing water supplied at the time of fire suppression. By reducing the risk of collision with the wheel or skid of a helicopter, damage to the fire extinguishing nozzle can be prevented, and it is possible to sprinkle water while rotating by the water pressure of the fire water to secure a wider spray range of fire water. It is to provide a rotating fire extinguishing nozzle for a helideck.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

In order to achieve the above object, the present invention is formed in a hollow cylindrical shape with open top and bottom surfaces, and is fixed on a helideck to communicate with a water supply pipe through which fire extinguishing water is supplied; A plurality of through-holes 24 are provided inside the body part 10 to pass through the fire extinguishing water introduced into the body part 10, and a plurality of piston tip grooves ( 26) the piston part 20 is formed; And the lower portion is installed in engagement with the upper portion of the piston part 20, and the fire extinguishing water passing through the plurality of through holes 24 generates a predetermined rotational force and is sprayed to the outside at the upper end. It is possible to provide a rotating fire extinguishing nozzle for a helideck including a nozzle part 30 having a plurality of notches 34 formed thereon.

The piston part 20 is formed to be recessed from an upper surface to a predetermined depth so as to form a nozzle receiving part 22 into which the lower part of the nozzle part 30 is inserted, and a protrusion formed in the center of the nozzle receiving part 22 And, it characterized in that it comprises a fastening protrusion 23 inserted into the fastening hole 33 formed through the central portion of the nozzle part 30.

In addition, the piston part 20 is formed by being recessed downward from the upper surface in the central part, and includes a fastening groove 23-1 having a thread formed on the inner circumferential surface, and the nozzle part ( A fastening bolt 40 passing through 30 is coupled to fasten the nozzle part 30 to the piston part 20, and limit the lifting height of the nozzle part 30.

In addition, the plurality of through holes 24 are formed to penetrate from the lower surface of the piston part 20 to the upper surface, and the openings of the plurality of through holes 24 formed in the lower surface of the piston part 20 are arranged in a triangular arrangement. And the openings of the plurality of through holes 24 formed on the upper surface of the piston part 20 are arranged in a circular arrangement.

On the other hand, the nozzle unit 30 is characterized in that the injection guide surface 32 is formed in an arc shape along the outer circumferential surface to guide the injection direction of the fire extinguishing water.

In addition, the plurality of notches 34 are formed in a V-shape, and one surface is formed to be a flat surface, and the other surface is formed to be rounded to form a curved surface.

The present invention is installed in a recessed state on the helitech, and by making it pop-up by the water pressure of the fire extinguishing water supplied at the time of fire suppression, the risk of collision with the wheel or skid of the helicopter is reduced, thereby damaging the fire extinguishing nozzle. There is an advantage in that the spraying range of the fire extinguishing water can be secured wider by enabling sprinkling while rotating by the water pressure of the fire extinguishing water.

1 is a perspective view of a rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention.
Figure 2 is an exploded perspective view of a rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention.
3 is a cross-sectional view of a body portion according to a preferred embodiment of the present invention.
4 is a bottom view of a piston part according to a preferred embodiment of the present invention.
5 is a plan view of a piston part according to a preferred embodiment of the present invention.
6 is a cross-sectional view taken along line A-A' of FIGS. 4 and 5.
7 is a partial cross-sectional view of a nozzle part according to a preferred embodiment of the present invention.
8 is a bottom view of a nozzle part according to a preferred embodiment of the present invention.
9 is a bottom view of a nozzle unit according to another embodiment of the present invention.
Figure 10 is a cross-sectional view showing a closed state of the rotary type fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention.
11 is a cross-sectional view showing a state in which the rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention is popped up (POP-UP).
12 is a cross-sectional view showing a state in which the nozzle unit is rotated according to a preferred embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

With reference to the accompanying drawings below will be described in detail for the implementation of the present invention. Regardless of the drawings, the same reference numerals refer to the same elements, and "and/or" includes each and all combinations of one or more of the mentioned items.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical idea of the present invention.

The terms used in this specification are for describing exemplary embodiments, and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, “comprises” and/or “comprising” do not exclude the presence or addition of one or more other elements other than the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention, Figure 2 is an exploded perspective view of the rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention.

As shown in FIGS. 1 and 2, the rotating fire extinguishing nozzle for a helideck includes a body part 10, a piston part 20, a nozzle part 30, and a fastening bolt 40.

The body part 10 forms the outer periphery of the fire extinguishing nozzle, has a hollow circular shape with open upper and lower surfaces, and is fixed on a helideck to communicate with a water supply pipe (not shown) to supply fire extinguishing water.

Preferably, a seating portion 12 protruding outward along an outer circumferential surface is formed at the upper end of the body portion 10, and the body portion 12 is fixed to the upper surface of the pancake portion of the helideck. 10) is buried on the pancake part of the helideck.

That is, the body portion 10 can be stably installed on the helideck by the lower surface of the seating portion 12 being in close contact with the upper surface of the pancake portion.

In addition, the lower part of the body 10 may be directly connected to the front end of the water supply pipe (not shown) so that the fire extinguishing water used for fire suppression may be supplied to the inside.

On the other hand, a piston part 20 is installed on the inner upper side of the body part 10, and the nozzle part 30 is provided on the upper side of the piston part 20.

The piston part 20 allows the fire extinguishing water introduced into the body part 10 to be sprayed at a high pressure, while the nozzle part 30 is normally an upper opening of the fire extinguishing nozzle, that is, the body part 10 And it is fixed inside the piston part 20 so as to close the upper opening of the piston part 20, and freely rises and descends by the water pressure of the fire extinguishing water injected at high pressure from the piston part 20 when a fire occurs. Fire extinguishing water should be sprayed radially.

Preferably, the piston part 20 has a cylindrical shape, but is recessed downward from the top to a predetermined depth to form a nozzle receiving part 22, which is a space in which the nozzle part 30 is coupled, and the nozzle receiving A cylindrical fastening protrusion 23 is protruded in the central part of the part 22 and is inserted into a fastening hole 33 formed through the central part of the nozzle part 30.

In other words, the upper part of the piston part 20 and the lower part of the nozzle part 20 are installed so as to be engaged with each other while the fastening protrusion part 23 is inserted into the fastening hole 33.

At this time, a fastening groove 23-1 recessed downward from an upper surface is formed in the central part of the piston part 20, that is, a central part of the fastening protrusion 23, and a thread is provided on the inner circumferential surface of the fastening groove 23-1. , The piston part 20 and the nozzle part 30 may be mutually fastened by the fastening bolt 40 passing through the fastening hole 33 and engaging with the thread of the fastening groove 23-1.

In addition, the piston part 20 includes a plurality of through-holes 24 vertically penetrating, and the plurality of through-holes 24 pass through the fire extinguishing water flowing into the body As a passage for spraying with pressure, when the fire extinguishing water passing through the plurality of through holes 24 strikes the nozzle part 30, the nozzle part 30 is free to a predetermined height by the water pressure of the fire extinguishing water. You can get up and down.

In addition, the piston part 20 has a plurality of piston tip grooves 26 formed along the circumference of the upper end, and the fire extinguishing water passing through the plurality of through holes 24 is radially formed through the plurality of piston tip grooves 26. Can be sprayed.

Meanwhile, a plurality of notches 34 having a V-shape are formed at the upper end of the nozzle part 30, respectively, and the plurality of notches 34 hitting the nozzle part 30 through the plurality of through holes 24 Part of the fire extinguishing water is sprayed along the plurality of notches 34 and a predetermined rotational force is generated so that the nozzle unit 30 rotates in one direction, thereby securing a wider spray range of the fire extinguishing water.

3 is a cross-sectional view of a body part according to a preferred embodiment of the present invention.

As shown in FIG. 3, the body portion 10 has a hollow cylindrical shape with open top and bottom surfaces, and a first coupling portion 14, which is a space to which the water supply pipe (not shown) is connected, is provided in the lower inner side. And, a second coupling portion 16, which is a space in which the piston portion 30 is coupled, is provided in the upper inner portion.

The water supply pipe (not shown) is inserted into and connected to the first coupling portion 14, and preferably, a first thread 15 is formed on the sidewall surface of the first coupling portion 14 so that the water supply pipe (not shown) It facilitates detachment by screwing the tip of the cylinder.

In addition, a second screw thread 15 corresponding to the coupling screw 21 formed on the outer circumferential surface of the piston part 30 is formed on the side wall surface of the second coupling part 16, and the coupling screw thread 21 and the first 2 The piston part 30 is prevented from being separated from the second coupling part 16 even with the hydraulic pressure of the fire extinguishing water flowing into the body part 10 due to mutual coupling of the threads 15.

At this time, a stepped portion 18 protruding along the inner wall surface of the body portion 10 is formed between the first coupling portion 14 and the second coupling portion 16, and the upper surface of the stepped portion 18 The piston part 30 is prevented from being separated downward from the body part 10 by making the lower surface of the piston part 30 in contact and seated.

In addition, the stepped portion 18 is formed to prevent a sudden change in cross section between the water supply pipe (not shown) and the body portion 10, that is, the diameter of the passage through which the fire extinguishing water flows sharply expand or contract. It is possible to minimize the occurrence of head loss in the flow of the digestive water flowing into the body portion 10 from the water supply pipe (not shown), and preferably, the stepped portion 18 in the body portion 10 Since the inner diameter of the portion where is formed is the same as the inner diameter of the water supply pipe (not shown) connected to the body part 10, head loss due to a change in cross section can be minimized.

4 is a bottom view of a piston part according to a preferred embodiment of the present invention, FIG. 5 is a plan view of a piston part according to a preferred embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line A-A' of FIGS. 4 and 5.

As shown in FIGS. 4 to 6, the plurality of through holes 24 are formed to penetrate from the lower surface of the piston part 20 to the upper surface.

At this time, the openings of the plurality of through holes 24 formed on the lower surface of the piston part 20 are arranged in a triangular arrangement, while the openings of the plurality of through holes 24 formed on the upper surface of the piston part 20 are circular. It is desirable to be arranged in an array.

In addition, some of the plurality of through holes 24 extend to the piston tip groove 26 so that the fire extinguishing water is sprayed smoothly in a radial direction, and preferably, the piston part 20 is arranged in a triangular arrangement on the lower surface of the piston. Among the openings of the plurality of through holes 24, the plurality of through holes 24 having an opening located at the center of each line segment are formed to extend to the adjacent piston tip groove 26.

Furthermore, as shown in FIG. 6, the piston part 20 is recessed upward by a predetermined depth, and the diameter of the space recessed upward is the stepped part 18 in the body part 10. It is possible to minimize head loss due to a change in cross section in the flow of the fire extinguishing water by forming the same as the inner diameter of the portion where is formed.

7 is a partial cross-sectional view of a nozzle part according to a preferred embodiment of the present invention, and FIG. 8 is a bottom view of a nozzle part according to a preferred embodiment of the present invention.

7 and 8, the nozzle part 30 is formed with a spray guide surface 32 recessed in an arc shape along an upper outer circumferential surface, and the fire extinguishing water from the piston part 20 is the spray guide surface It is sprayed along 32.

In other words, the injection guide surface 32 is provided to guide the injection direction of the fire extinguishing water.

On the other hand, the plurality of notches 34 formed in the nozzle part 30 are each cut into a V-shape, and the plurality of notches 34 are radially based on the central axis of the nozzle part 30. It is formed, and is formed to extend to the upper end of the nozzle part 30 along the injection guide surface 32, and is formed to increase in depth or gradually increase in width toward the upper end of the nozzle part 30.

At this time, one surface (34-1) of the plurality of notches (34) is formed as a flat surface, while the other surface (34-2) opposite to the one surface (34-1) is formed as a curved surface formed to be rounded. When the fire extinguishing water passes through the plurality of notches 34, a vortex is formed along the other surface 34-2 so that the nozzle unit 30 rotates in the direction in which the other surface 34-2 is formed. do.

In addition, it is preferable that the plurality of notches 34 are formed in 12, and when the number of the plurality of notches 34 is less than 12 or more than 12, the rotational force of the nozzle unit 30 may be reduced. have.

In addition, the fastening hole 33, which is a passage through which the fastening bolt 40 is inserted and coupled to the fastening groove 23-1 of the piston part 20, is formed through the central part of the nozzle part 30, , A protrusion 33-1 protruding along the circumference is formed under the fastening hole 33.

The protrusion 33-1 is formed to limit the elevation height when the nozzle unit 30 is freely raised by the fire extinguishing water, and a more detailed description will be provided later.

9 is a bottom view of a nozzle unit according to another embodiment of the present invention.

As shown in FIG. 9, a plurality of rotation guide grooves 36 for guiding the nozzle unit 30 to rotate in one direction may be additionally formed on the injection guide surface 32.

The rotation guide groove 36 is formed by being recessed in a bow shape, and a plurality of rotation guide grooves 36 are radially provided with respect to the central axis of the nozzle unit 30, and form a tornado shape as a whole.

In addition, the rotation guide groove 36 is depressed inclined toward the other side curved from one side in the width direction where both ends are located.

Therefore, by pressing the fire extinguishing water in the curved direction of the rotation guide groove 36 along the inclination of the rotation guide groove 36, the nozzle part 30 is in one direction, that is, the curved direction of the rotation guide groove 36 It generates a predetermined rotational force to enable rotation in the direction.

10 is a cross-sectional view showing a closed state of the rotary fire extinguishing nozzle for a helideck according to a preferred embodiment of the present invention, Figure 11 is a pop-up rotary fire extinguishing nozzle for the helideck according to a preferred embodiment of the present invention (POP- UP) is a cross-sectional view showing a state, and Figure 12 is a cross-sectional view showing a state in which the nozzle unit is rotated according to a preferred embodiment of the present invention.

As shown in FIG. 10, the fire extinguishing nozzle is installed in a state in which the body part 10 forming the outer periphery of the fire extinguishing nozzle is recessed on the helitech in order to prevent collision with the wheel or skid of the helicopter, Normally, the nozzle part 30 is located above the inside of the piston part 20, that is, in the nozzle receiving part 22 to close the upper opening of the body part 10 and the piston part 20 Keep it.

However, when a fire occurs, the fire extinguishing water supplied to the body part 10 through the water supply pipe (not shown) passes through the plurality of through holes 24 provided in the piston part 20, and the nozzle part 30 ) By pressing the injection guide surface 32 formed on the nozzle unit 30, as shown in FIG. 11, is freely raised and lowered.

At this time, the free lifting height of the nozzle part 30 is determined by the distance between the fastening bolt 40 and the protrusion 33-1 formed on the nozzle part 30, and specifically, the nozzle part 30 ), when the lower surface of the bolt head formed on the upper part of the fastening bolt 40 comes into contact with the upper surface of the protruding part 33-1, the nozzle part 30 stops freely lifting.

In summary, the nozzle part 30 is raised and lowered by the water pressure of the fire extinguishing water, and the fire extinguishing nozzle pops up by a height limited by the fastening bolt 40 and the protrusion 33-1. ) By opening the upper opening of the body part 10 and the piston part 20 to provide a passage through which the fire extinguishing water is injected in the radial direction of the fire extinguishing nozzle, and the fire extinguishing water is parabolic along the injection guide surface 32 It is sprayed while drawing.

In this case, a part of the fire extinguishing water that has passed through the plurality of through holes 24 may be sprayed to the outside of the fire extinguishing nozzle through the piston tip groove 26 formed at the upper end of the piston part 20.

Here, a part of the fire extinguishing water injected along the injection guide surface 32 passes through the plurality of notches 34 formed on the upper end of the nozzle unit 30 to generate a predetermined rotational force, as shown in FIG. , Rotate the nozzle unit 30 in one direction.

Therefore, the extinguishing water is rotated by the rotating nozzle unit 30 to enable a wide range of fire extinguishing, and further, the extinguishing water is dispersed by colliding with the rotating nozzle unit 30 so that the extinguishing water is It is possible to secure a wider spread.

In addition, when the piston tip groove 26 or the plurality of notches 34 is clogged due to foreign substances due to long-term non-use, the fire extinguishing nozzle is extinguished by the body part 10 and the piston part 20. When water is supplied, the pressure acting inside increases, and the pressure pushes away the foreign matter so that it is easily removed from the fire extinguishing nozzle.

Although the embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You can understand that there is. Therefore, it is to be understood that the embodiments described above are illustrative and non-limiting in all respects.

10: body
12: seating portion 14: first coupling portion
15: first thread 16: second coupling portion
17: second thread 18: stepped portion
20: piston part
21: coupling thread 22: nozzle receiving part
23: fastening protrusion 23-1: fastening groove
24: through hole 26: piston tip hole
30: nozzle part
32: injection guide surface 33: fastening hole
34: notch 36: rotation guide groove
40: tightening bolt

Claims (6)

A body portion 10 formed in a hollow cylindrical shape with open upper and lower surfaces, fixed on a helideck and in communication with a water supply pipe through which fire extinguishing water is supplied;
A plurality of through-holes 24 are provided inside the body part 10 to pass through the fire extinguishing water introduced into the body part 10, and a plurality of piston tip grooves ( 26) the piston part 20 is formed; And
The lower part is installed in engagement with the upper part of the piston part 20, and the fire extinguishing water that has passed through the plurality of through holes 24 can be freely raised and lowered. The notch 34 of the nozzle portion 30 is formed; including,
The body portion 10 includes a first coupling portion 14 formed to connect the water supply pipe (not shown) at an inner lower portion, and a second coupling portion 16 formed to couple the piston portion 20 at an inner upper portion. And, between the first coupling portion 14 and the second coupling portion 16, protruding along the inner wall surface of the body portion 10 so that the body portion 10 has the same diameter as the inner diameter of the water supply pipe. It has a stepped portion 18 formed,
The piston part 20 is formed to have the same diameter as the inner diameter of the portion in which the stepped part 18 is formed inside the body part 10 and the space recessed upward is recessed from the lower surface to the upper side by a predetermined depth. And
The nozzle part 30 is formed in an arcuate shape along the outer circumferential surface and a spray guide surface 32 guiding the spraying direction of the fire extinguishing water,
The plurality of notches 34 are formed by cutting in a V-shape from the injection guide surface 32 to the top surface of the nozzle part 30, one surface forming a flat surface, and the other surface forming a curved surface formed to be rounded. A rotating fire extinguishing nozzle for a helideck, characterized in that. The method of claim 1,
The piston part 20,
A nozzle receiving portion 22 that is recessed from the upper surface to a predetermined depth and into which the lower portion of the nozzle portion 30 is inserted,
A rotating type for a heli-deck, characterized in that it includes a fastening protrusion 23 protruding from the central part of the nozzle receiving part 22 and inserted into the fastening hole 33 formed through the central part of the nozzle part 30 Digestion nozzle. The method of claim 1,
The piston part 20,
It is formed by being recessed downward from the upper surface in the central part, and includes a fastening groove (23-1) formed with a thread on the inner peripheral surface,
A fastening bolt 40 passing through the nozzle part 30 is coupled to the fastening groove 23-1 to fasten the nozzle part 30 to the piston part 20, and the nozzle part 30 A rotary fire extinguishing nozzle for a helideck, characterized in that limiting the lifting height. The method of claim 1,
The plurality of through holes 24,
The piston part 20 is formed to penetrate from the lower surface to the upper surface,
The openings of the plurality of through holes 24 formed on the lower surface of the piston part 20 are arranged in a triangular arrangement,
A rotary fire extinguishing nozzle for a helideck, characterized in that the openings of the plurality of through holes 24 formed on the upper surface of the piston part 20 are arranged in a circular arrangement. delete delete

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