Sprinkler head

Abstract

To provide a sprinkler head that can obtain sprinkling which is uniform regardless of watering pressure and water quantity.SOLUTION: A sprinkler head 1 in the present invention is equipped with a deflector for sprinkling extinguishing water, including an upper deflector 15 installed in an upper side; a lower deflector 17 which is installed under the upper deflector 15 by opposing the lower face of the upper deflector 15; and a disc 19 which is provided between the lower deflector 17 and the upper deflector 15 and which induce, to the lower deflector 17, the extinguishing water that passed the upper deflector 15. Both the upper deflector 15 and the lower deflector 17 have a plurality of lugs which are radially provided with a prescribed space apart in the circumferential direction. The disc 19 is characterized by having an overhang part overhanging outward and a negative pressure generation space S which is under the overhanging part to generate a negative pressure at the time of sprinkling.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sprinkler head for fire fighting. [Background technology]

[0002] Sprinkler heads sense the heat of a fire and spray fire extinguishing fluid (fire water). To ensure the desired distribution of water, they are equipped with deflectors that collide the water sprayed from the nozzle and disperse it in a desired direction.

[0003] Deflectors disperse fire extinguishing water in a specified direction, but it is known that the spray range is affected by the spray pressure and spray volume. Therefore, for example, Patent Document 1 discloses a "fire extinguishing spray head" that can obtain a predetermined water spray distribution even when the amount of fire extinguishing water is small.

[0004] The fire extinguishing spray head of Patent Document 1 is equipped with two deflectors consisting of a first deflector and a second deflector provided below it, and the first deflector is provided with a water passage hole. The first deflector has the function of guiding the fire extinguishing water to the second deflector and the function of preventing the water from splashing back from the second deflector and reaching the ceiling, and the second deflector has the function of dispersing the guided fire extinguishing water in a specified direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6422251 Summary of the Invention [Problem to be solved by the invention]

[0006] Although the first deflector in Patent Document 1 also has the function of dispersing the extinguishing water, its main function is to guide the extinguishing water to the second deflector. Therefore, as described in Patent Document 1, it is possible to spray water sufficiently even when the flow rate of the extinguishing water is low. However, it is not possible to achieve uniform water spraying regardless of the water spray pressure or the flow rate of fire extinguishing water.

[0007] The present invention has been made to solve such problems, and has as its object to provide a sprinkler head that can achieve uniform water spray regardless of the water spray pressure or water volume. [Means for solving the problem]

[0008] (1) The sprinkler head according to the present invention is provided with a deflector for spraying fire extinguishing water, an upper deflector provided on the upper side; a lower deflector provided below the upper deflector so as to face the lower surface of the upper deflector; and a disk provided between the lower deflector and the upper deflector for guiding the fire extinguishing water that has passed through the upper deflector to the lower deflector; Each of the upper deflector and the lower deflector has a plurality of claws arranged radially at predetermined intervals in the circumferential direction, The disk is characterized by having a protruding portion that protrudes outward and a negative pressure generating space below the protruding portion that generates negative pressure when water is sprayed.

[0009] (2) Furthermore, in the device described in (1) above, the protruding portion is configured by an abacus bead-shaped portion having the shape of an abacus bead, and is provided below the abacus bead-shaped portion with a cylindrical portion having a diameter smaller than the outer diameter of the abacus bead-shaped portion, and the space below the abacus bead-shaped portion is the negative pressure generating space.

[0010] (3) Furthermore, in the above (1), the protruding portion is configured by a truncated cone-shaped portion, and a cylindrical portion having a diameter smaller than the outer diameter of the truncated cone-shaped portion is provided below the truncated cone-shaped portion, and the space below the truncated cone-shaped portion is the negative pressure generating space.

[0011] (4) Furthermore, in the above (1), the protruding portion is formed by an inverted truncated cone-shaped portion, and the area around the reduced diameter portion at the bottom of the inverted truncated cone-shaped portion is the negative pressure generating space. [Effects of the Invention]

[0012] In the present invention, a disc is provided between the upper deflector and the lower deflector, and the disc has an outward protruding portion and a negative pressure generating space below the protruding portion that generates negative pressure when water is sprayed.As a result, the fire extinguishing water that passes through the upper deflector is guided radially inward and outward of the lower deflector, resulting in uniform water spraying regardless of the water spray pressure or water volume. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an external view of a sprinkler head according to an embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view of the sprinkler head shown in FIG. [Figure 3] FIG. 2 is an exploded perspective view of the main components that make up the sprinkler head shown in FIG. 1. [Figure 4] 1 is an explanatory diagram of the operation of the sprinkler head according to the present embodiment. [Figure 5] FIG. 2 is an explanatory diagram of another embodiment 1 of the sprinkler head according to the present embodiment. [Figure 6] FIG. 2 is an explanatory diagram of another embodiment 2 of the sprinkler head according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] As shown in Figures 1 and 2, a sprinkler head 1 according to one embodiment of the present invention comprises a head body 5 having a discharge port 3 formed therein, the upper side of which is connected to a pipe and which discharges extinguishing fluid sent from the pipe downward when the valve is open, a valve body 7 which closes the discharge port 3, a heat-sensitive member 9 which supports the valve body 7, a frame 11 which extends downward from the head body 5, a straightening cylinder 13 which straightens the extinguishing fluid discharged from the discharge port 3, a cylindrical deflector support 14 which is inserted into the straightening cylinder 13 and supports each deflector, an upper deflector 15 which is provided below the straightening cylinder 13 and sprays extinguishing water, a lower deflector 17, and a disk 19 provided between the lower deflector 17 and the upper deflector 15.

[0015] 1 and 2 is a so-called closed type in which the valve body 7 opens and discharges water when the heat-sensitive member 9 is destroyed by the heat of a fire. However, the present invention is not limited to the wet type, and also includes a so-called open type that does not have the valve body 7 or heat-sensitive member 9. The upper deflector 15, the lower deflector 17 and the disk 19, which are features of the present invention, will now be described.

[0016] <Upper deflector> As shown in Fig. 3, the upper deflector 15 has an upper hole 15a at its center into which the deflector support body 14 is inserted, an upper surface 15b around the upper hole 15a, and a plurality of upper claws 15c radially arranged at predetermined intervals from the outer periphery of the surface. As shown in Fig. 3, each upper claw 15c has a generally trapezoidal shape with a tip wider than a base. Each upper claw 15c has a base bent downward and a central portion bent slightly upward from the horizontal, in other words, a shape resembling a C-letter lying on its side (hereinafter referred to as a "dead C-letter shape").

[0017] The upper deflector 15 has such a fallen C-shape for the upper claws 15c, which enhances the function of spraying water farther. The gap between the upper claws 15c serves as a passage for the fire extinguishing water to flow downward. The upper deflector 15 of the present invention is not limited to the above-mentioned shape, and may have a flat shape similar to the lower claw 17c of the lower deflector 17 described later.

[0018] <Lower deflector> The lower deflector 17 is provided below the upper deflector 15 so as to face the lower surface of the upper deflector 15 . The lower deflector 17, like the upper deflector 15, has a lower hole portion 17a, a lower surface portion 17b, and a plurality of lower claws 17c radially provided at predetermined intervals from the outer periphery of the surface portion in the circumferential direction. As shown in Fig. 3, the lower claws 17c have a generally trapezoidal shape with the width of the tip portion being wider than the width of the base portion.

[0019] The lower deflector 17 differs from the upper deflector 15 in that the upper claws 15c of the upper deflector 15 are bent, whereas the lower claws 17c of the lower deflector 17 are not bent but have flat surfaces. In other words, the upper claw 15c is formed by bending the lower claw 17c. Further, the lower claws 17c of the lower deflector 17 are disposed at positions overlapping with the upper claws 15c of the upper deflector 15 in a plan view.

[0020] <Disc> As shown in FIG. 3, the disk 19 has an abacus bead-shaped portion 19a as a protruding portion that protrudes outward, and a cylindrical portion 19b below the abacus bead-shaped portion 19a, the cylindrical portion 19b having a diameter smaller than the outer diameter of the abacus bead-shaped portion 19a. The abacus bead shaped portion 19a is a portion in which an upper truncated cone shape and a lower inverted truncated cone shape are integrated with their bottoms facing each other, and is shaped like an abacus bead. The amount of protrusion of the abacus bead shaped portion 19a is preferably approximately the same diameter as the upper surface portion 15b in a plan view. The reasons are as follows. If the abacus bead-shaped portion 19a protrudes too much from the upper surface portion 15b, the amount of water that reaches the lower deflector 17 straight from the upper deflector 15 without colliding with the disc 19 decreases, and the amount of water sprayed over a medium distance decreases. On the other hand, if the diameter of the disk 19 is too small compared to the top surface portion 15b, the amount of water that strikes the disk 19 will decrease, resulting in a decrease in the amount of water sprayed to the surrounding area. As described above, in order to perform well-balanced water spraying, it is desirable that the amount of projection of abacus bead-shaped portion 19a be approximately the same diameter as upper surface portion 15b in plan view. The space below the abacus bead-shaped portion 19a serves as a negative pressure generating space S that generates a negative pressure such that the pressure inside the flowing water is lower than the pressure outside the flowing water when the water is sprayed.

[0021] The operation of the sprinkler head 1 of this embodiment configured as described above will be described with reference to Fig. 4. The dashed arrows shown in Fig. 4 indicate the flow of fire-extinguishing water. When the heat-sensitive member 9 is destroyed by the heat of the fire, the valve body 7 opens and fire-extinguishing water is discharged from the discharge port 3 downwards to the frame 11. The discharged fire extinguishing water enters the flow straightening cylinder 13, is straightened in the flow straightening cylinder 13, and is discharged toward each deflector.

[0022] As shown by the dashed arrows in FIG. 4, part of the extinguishing water discharged from the straightening cylinder 13 collides with the upper deflector 15, and the rest passes through the gaps between the upper claws 15c of the upper deflector 15. Regardless of whether the pressure of the fire extinguishing water is low or high, or whether the amount of water is large or small, the upper deflector 15 has the function of mainly spraying the fire extinguishing water over a long distance. However, the upper deflector 15 also sprays water over a medium distance. The amount of fire extinguishing water passing through the upper deflector 15 is large when the pressure is high (large amount of water) and is small when the pressure is low (small amount of water). In other words, when the pressure is low (small amount of water), a large amount of water collides with the upper claws 15c of the upper deflector 15 and is sprayed far away. In particular, in this embodiment, the shape of the upper claws 15c of the upper deflector 15 is an inverted C-shape, so that even when the fire extinguishing water is at low pressure (small amount of water), it is more preferable because the water is sprayed relatively far along this shape as if sliding down a slide. In this way, the upper deflector 15 has the function of spraying the fire extinguishing water far away regardless of whether the pressure of the fire extinguishing water is high or low.

[0023] The fire extinguishing water that passes through the upper deflector 15 is divided into two parts: one that reaches the lower deflector 17 directly and one that hits the disk 19 . The fire extinguishing water that reaches the lower deflector 17 directly hits the lower claws 17c of the lower deflector 17 and is divided into two parts: one that is sprayed over a medium distance and the other that is sprayed directly below or nearby through the gaps in the lower claws 17c.

[0024] In addition, since the disc 19 has an abacus bead-shaped portion 19a, the fire extinguishing water that hits the disc 19 spreads outward and is guided radially outward of the lower deflector 17, and the water that hits the lower deflector 17 is sprayed at a medium distance or slightly further away, while the water that does not hit the lower deflector 17 is sprayed closer than the medium distance.

[0025] Furthermore, when the extinguishing water collides with the abacus bead-shaped portion 19a of the disk 19, a pressure difference occurs between the outside and inside of the water flow, with the outside being higher pressure and the inside being lower pressure. As a result, the space below the abacus bead-shaped portion 19a, which is on the inside of the water flow, becomes a low-pressure negative pressure generating space S, and in this negative pressure generating space S, the extinguishing water flows along the disk 19 (see the dashed arrow in Figure 4) and is guided radially inward of the lower deflector 17. The guided extinguishing water is discharged from the gap in the lower deflector 17 and sprayed in the vicinity. In this way, the fire extinguishing water that reaches the lower deflector 17 directly is sprayed evenly over a medium distance to the vicinity by the function of the lower deflector 17 and the disk 19.

[0026] As described above, the sprinkler head 1 of this embodiment is equipped with the upper deflector 15, the lower deflector 17, and the disk 19, so that water is sprayed evenly over all areas, including the area directly below the sprinkler head 1, the middle area, and the far area. Furthermore, in this embodiment, two deflectors are provided, and as described above, the action of the upper deflector 15 makes it possible to spray water far away regardless of the pressure or amount of fire extinguishing water.

[0027] In the above description, the shape of the protruding portion of the disk 19 is an abacus bead-shaped portion 19a, but the present invention is not limited to this, and as shown in Figure 5, the protruding portion may be configured as a truncated cone-shaped portion 19c.

[0028] 6, the protruding portion may be configured as an inverted truncated cone portion 19d, which is an inverted truncated cone. In this case, the area around the reduced diameter portion at the bottom of the inverted truncated cone portion 19d becomes the negative pressure generating space S. In FIG. 6, the upper deflector 15 is not shown.

[0029] Furthermore, by connecting the upper truncated cone shape and the lower inverted truncated cone shape of the abacus bead-shaped portion 19a with a chamfered, smooth curved surface, the extinguishing water can be guided radially inward more smoothly, which is preferable.

[0030] In this invention, a disk is installed between the upper and lower deflectors, but even if an upper deflector is not installed, the action of the disk can make the water flow evenly to the lower deflector. In other words, even if there is only one deflector, installing a disk can improve the effect of even water spraying. When one deflector is used, the shape thereof may be the shape of the upper deflector 15 or the shape of the lower deflector 17 specified in this specification. [Explanation of symbols]

[0031] 1 sprinkler head 3 outlet 5 Head body 7 Valve body 9 Heat-sensitive material 11 frames 13 Rectifier tube 14 Deflector support 15 Upper deflector 15a Upper hole 15b Top part 15c upper nail 17 Lower deflector 17a Lower hole part 17b Bottom part 17c lower nail 19 discs 19a Abacus bead shaped part 19b Cylindrical part 19c Conical truncated section 19d Inverted truncated cone section S Negative pressure generating space

Claims

1. A sprinkler head equipped with a deflector for spraying fire extinguishing water, an upper deflector provided on the upper side; a lower deflector provided below the upper deflector so as to face the lower surface of the upper deflector; and a disk provided between the lower deflector and the upper deflector for guiding the fire extinguishing water that has passed through the upper deflector to the lower deflector; Each of the upper deflector and the lower deflector has a plurality of claws arranged radially at predetermined intervals in the circumferential direction, The sprinkler head is characterized in that the disk has a protruding portion that protrudes outward and a negative pressure generating space below the protruding portion that generates negative pressure when water is sprayed.

2. 2. The sprinkler head according to claim 1, wherein the protruding portion is constituted by an abacus bead-shaped portion having the shape of an abacus bead, and a cylindrical portion having a diameter smaller than the outer diameter of the abacus bead-shaped portion is provided below the abacus bead-shaped portion, and the space below the abacus bead-shaped portion serves as the negative pressure generating space.

3. A sprinkler head as described in claim 1, characterized in that the protruding portion is composed of a truncated cone-shaped portion having a shape of a truncated cone, and has a cylindrical portion below the truncated cone-shaped portion having a diameter smaller than the outer diameter of the truncated cone-shaped portion, and the space below the truncated cone-shaped portion becomes the negative pressure generating space.

4. A sprinkler head as described in claim 1, characterized in that the protruding portion is composed of an inverted truncated cone-shaped portion formed by turning a truncated cone upside down, and the negative pressure generating space is around the reduced diameter portion at the bottom of the inverted truncated cone-shaped portion.

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