Water discharge head cap

Abstract

To provide a water discharge head cap which is easy to replace.SOLUTION: A water discharge head cap 1 has a water outlet port at an end, a flange part 35 whose peripheral surface is formed into a polygon on a base end side, and a screw part following the same, and is removably fitted to the water outlet port of water discharge heads 31, 32 fitted to a joint part 33 connected to a water supply pipe by screwing a screw part, and includes: a cap body 3 covering the water outlet port; and a resin holding ring 7 which is connected to the cap body 3 via a string part 5, inserted into the screw part with the water discharge heads 31, 32 fitted to the joint part 33, and holds the cap body 3. By deforming the holding ring 7, the water discharge head cap can be inserted into the screw part through the flange part 35.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cap for a water discharge head that is detachably attached to a water discharge port of the water discharge head.

Background Art

[0002] In a road tunnel, a water spray facility may be provided as a disaster prevention facility. The water spray facility has water discharge heads installed at several-meter intervals in the longitudinal direction of the tunnel at high positions such as the ceiling or above the side wall of the tunnel. When a fire occurs, atomized water is discharged from the water discharge heads to suppress the fire and prevent the spread of the fire.

[0003] As the water discharge head, it is often installed only on one side above the side wall of the tunnel. In that case, in order to be able to discharge water uniformly to the protection section from one side wall side where the head is installed to the other side wall side including the ceiling side, a type having a plurality of types of nozzles (short-range nozzles, long-range nozzles, etc.) with different water discharge distances and water discharge patterns is used.

[0004] A cap for the water discharge head is attached to the water discharge port at the tip of the nozzle of the water discharge head in order to prevent the adhesion of dirt such as soot derived from the exhaust gas of automobiles. As functions of the cap for the water discharge head, it can cover the water discharge port at all times, open the water discharge port with water pressure during water discharge, and can be restored after water discharge by regular inspection or the like.

[0005] As a conventional cap for a water discharge head that exhibits such functions, for example, there is a nozzle cap in which a lid portion covering the water discharge port is radially cut from the center to the outside to form a flap shape, as disclosed in Patent Document 1.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the case of Patent Document 1, since water discharge is performed through the flap, there is a problem that water discharge is inhibited by the flap as compared with the case where there is no flap. Therefore, as in the water discharge head cap 21 shown with hatching in FIG. 8, there is a cap body 23 that covers the water discharge ports of the water discharge heads 31 and 32 (not visible because they are covered by the cap body 23), and a holding ring 27 that is connected to the cap body 23 via a string-like portion 25 and holds the cap body 23.

[0008] The example shown in FIG. 8 is an example in which one short-range water discharge head 31 and two long-range water discharge heads 32 are provided in one joint portion 33. The water discharge head cap 21 is provided for the short-range water discharge head 31 and the long-range water discharge head 32, and although the shape of the cap body 23 is different, there is no significant difference in other points. Therefore, in this specification, it will be described without changing the reference numerals etc. (the same applies to the embodiments described later).

[0009] The water discharge heads 31 and 32 have a water discharge port at the tip, and a flange portion 35 whose peripheral surface is formed in a polygon (hexagon in this example) on the base end side and a screw portion (not shown) continuous therewith. Then, it is attached by screwing the screw portion into a joint portion 33 connected to a water supply pipe (not shown). The flange portion 35 is a portion where a wrench is held when screwing in or removing the water discharge heads 31 and 32, and is the portion having the maximum diameter in the water discharge heads 31 and 32.

[0010] The holding ring 27 of the water discharge head cap 21 has an annular shape with a circular hole 27a, and the circular hole 27a is set smaller than a circle (circle (d) shown by a dotted line in the figure) connecting the vertices of the hexagon (hexagon (b) shown by a thick broken line in the figure) of the flange portion 35. The water discharge head cap 21 is attached by inserting the holding ring 27 into the threaded portions of the water discharge heads 31 and 32, threading the threaded portions of the water discharge heads 31 and 32 into the threaded holes of the joint portion 33, and tightening the flange portion 35 with a wrench. In this state, since the holding ring 27 cannot pass through the flange portion 35, the water discharge head cap 21 can be held on the water discharge heads 31 and 32.

[0011] In the water discharge head cap 21 configured as described above, the string-like portion 25 may break when a test water discharge is performed or the like. In this case, to attach a new water discharge head cap 21, it is necessary to once remove the water discharge heads 31 and 32 from the joint portion 33, insert the holding ring 27 into the threaded portions of the water discharge heads 31 and 32, and thread the water discharge heads 31 and 32 back into the joint portion 33 again, which is troublesome.

[0012] The present invention has been made to solve such problems, and an object thereof is to provide a water discharge head cap that is easy to replace.

Means for Solving the Problems

[0013] (1) The water discharge head cap according to the present invention has a water discharge port at the tip, and a flange portion having a polygonal peripheral surface formed on the base end side and a threaded portion continuous thereto, and is detachably attached to the water discharge port of the water discharge head that is attached by threading the threaded portion into a joint portion connected to a water supply pipe, and a cap body that covers the water discharge port, and a holding ring made of resin that is connected to the cap body via a string-like portion and is inserted into the threaded portion in a state where the water discharge head is attached to the joint portion to hold the cap body. It is characterized in that it can be inserted into the threaded portion through the flange portion by deforming the holding ring.

[0014] (2) Further, in the one described in (1) above, the inner peripheral shape of the ring in the holding ring is It has the same number of vertices corresponding to each vertex of the polygon in the flange portion and has a projecting piece portion protruding toward the inner diameter side between adjacent vertices. The polygon formed by connecting these adjacent vertices with a virtual line is larger than the polygon of the flange portion and has a size through which the water discharge port can pass. The polygon in which the sides are inscribed in the projecting piece portion is smaller than the polygon of the flange portion. When mounting the holding ring, after passing the water discharge port, by aligning the positions of the vertices of the inner peripheral shape of the ring and the vertices of the polygon and pushing them in, the projecting piece portion is deformed and can be inserted into the threaded portion through the flange portion. It is characterized by this.

[0015] (3) Further, in the one described in (2) above, the inner peripheral shape of the projecting piece portion is characterized by being arc-shaped.

Effect of the Invention

[0016] In the present invention, since the holding ring can be deformed to pass through the flange portion and be inserted into the threaded portion, when it becomes necessary to replace the cap for the water discharge head, the replacement work can be performed without removing the water discharge head from the joint portion, so the workability is extremely excellent.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying out the Invention

[0018] The cap for a water discharge head according to the present embodiment will be described with reference to FIGS. 1 to 7. In FIGS. 1 to 3, the same parts as those in FIG. 8 showing the conventional example are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 1 to 3, the cap 1 for a water discharge head according to an embodiment of the present invention is detachably attached to the water discharge ports of water discharge heads 31 and 32 that are screwed into a joint portion 33 connected to a water supply pipe (not shown). As described above, the water discharge heads 31 and 32 have a water discharge port at the tip and, on the base end side, a flange portion 35 having a polygonal peripheral surface and a screw portion continuous therewith. In FIGS. 1 to 3, as in FIG. 8, the screw portion is screwed into the joint portion 33.

[0019] The cap 1 for a water discharge head includes a cap body 3 that covers the water discharge port and a holding ring 7 made of resin connected to the cap body 3 via a string-like portion 5, as in the conventional example shown in FIG. 8. The cap 1 for a water discharge head is attached to the short-range water discharge head 31 and the long-range water discharge head 32, and has a cap body 3 that can be attached to each water discharge port. FIGS. 4 and 5 are for attachment to the long-range water discharge head 32, and FIGS. 6 and 7 are for attachment to the short-range water discharge head 31.

[0020] The retaining ring 7 is inserted into the threaded portion in a state where the water discharge heads 31 and 32 are attached to the joint portion 33, so that the retaining ring 7 is held by the water discharge heads 31 and 32. As a result, the retaining ring 7 has a function of holding the cap body 3 connected via the string-like portion 5.

[0021] The retaining ring 7 can be inserted into the threaded portion by passing through the flange portion 35 by being deformed. That is, in a state where the water discharge heads 31 and 32 are attached to the joint portion 33, by deforming the retaining ring 7, the retaining ring 7 can pass through the flange portion 35 of the water discharge heads 31 and 32 and can be attached.

[0022] A specific example of the shape of the retaining ring 7 will be described with reference to FIG. 1(B). As shown in FIG. 1(B), the inner peripheral shape of the ring in the retaining ring 7 has a number (six) of vertices corresponding to each vertex of the polygon (hexagon) in the flange portion 35, and has a protruding piece portion 9 protruding in an arc shape toward the inner diameter side between adjacent vertices.

[0023] And the polygon (the fine broken line hexagon (a) in the figure) formed by connecting adjacent vertices with a virtual line (the dotted line in the figure) is larger than the polygon (the thick broken line hexagon (b) in the figure) of the flange portion 35 and has a size through which the water discharge port can pass. Such a setting is for enabling the retaining ring 7 to pass through the flange portion 35 in a state where the water discharge heads 31 and 32 are attached to the joint portion 33.

[0024] Also, the polygon (the thin line hexagon (c) in the figure) whose sides are inscribed in the protruding piece portion 9 is smaller than the polygon (the broken line hexagon (b) in the figure) of the flange portion 35. Such a setting is for preventing the retaining ring 7 that has passed through the flange portion 35 from coming out of the flange portion 35.

[0025] When attaching the cap 1 for the water discharge head configured as described above to the water discharge heads 31 and 32, the following steps are taken. First, after passing the holding ring 7 through the drain opening, it is pushed in with the positions of the vertices of the inner peripheral shape of the ring and the vertices of the polygon (hexagon) of the flange portion 35 roughly aligned. As a result, all the protruding piece portions 9 are deformed toward the front side, and the opening of the holding ring 7 becomes larger, so that the holding ring 7 passes through the flange portion 35 and is inserted up to the threaded portions of the drain heads 31 and 32. When the holding ring 7 passes through the flange portion 35, the deformation returns to its original state, preventing it from coming off.

[0026] When the holding ring 7 is inserted up to the threaded portion, the drain head cap 1 is held by the drain heads 31 and 32. In this state, by attaching the cap body 3 so as to cover the drain openings of the drain heads 31 and 32, the attachment is completed as shown in FIGS. 1 to 3.

[0027] During the water discharge for regular inspection, when discharging water with the cap body 3 attached to the drain opening, due to the force of the water, the cap body 3 comes off from the drain opening, and the water discharge test can be carried out. Even if the cap body 3 comes off from the drain opening, the drain head cap 1 remains held by the drain heads 31 and 32 by the holding ring 7.

[0028] When the water discharge test is completed, the cap body 3 is attached to the drain opening. If it becomes necessary to replace the drain head cap 1, for example, because the string-like portion 5 is cut, it is necessary to remove the holding ring 7 held by the drain heads 31 and 32. The operation of removing the holding ring 7 is the reverse of the operation when attaching the drain head cap 1. That is, with the positions of the vertices of the inner peripheral shape of the ring of the holding ring 7 and the vertices of the polygon (hexagon) of the flange portion 35 roughly aligned, the holding ring 7 is pulled out in the axial direction of the drain heads 31 and 32. As a result, all the protruding piece portions 9 are deformed toward the back side, and the opening of the holding ring 7 becomes larger, so that the holding ring 7 passes through the flange portion 35 and is pulled out from the drain heads 31 and 32. The method of attaching a new drain head cap 1 is as described above.

[0029] As described above, according to the cap 1 for the water discharge head of the present embodiment, the holding ring 7 can be attached and detached with the water discharge heads 31 and 32 attached to the joint portion 33, and moreover, the holding ring 7 does not come off naturally. Thus, the replacement work can be extremely easily performed.

[0030] In the above description, the inner peripheral shape of the protruding piece portion 9 is exemplified as being arcuate, but the shape of the protruding piece portion 9 of the present invention is not limited to this, and it may be rectangular, triangular, trapezoidal, etc., as long as it can be deformed so as to pass through the polygon of the flange portion 35 when the holding ring 7 is attached.

[0031] Also, in the above embodiment, the inner peripheral shape of the holding ring 7 is shown as having six vertices and a protruding piece portion 9, but the inner peripheral shape of the holding ring 7 of the present invention is not limited to this, and it can be appropriately changed according to the shape of the flange portion 35. For example, when the flange portion 35 is formed in a substantially square shape, the inner peripheral shape of the holding ring 7 can also be made to have four vertices and protruding side portions in accordance with the four vertices of the square. Also, it is only necessary that it can be inserted into the screw portion by passing through the flange portion 35 by being deformed. Here, passing through the flange portion 35 by being deformed means that it cannot pass through the flange portion 35 without being deformed, and it cannot come out without being deformed in the attached state.

Explanation of Reference Numerals

[0032] 1 Cap for water discharge head 3 Cap body 5 String-like portion 7 Holding ring 9 Protruding piece portion 21 Cap for water discharge head (conventional example) 23 Cap body (conventional example) 25 String-like portion (conventional example) 27 Holding ring (conventional example) 27a Circular hole 31 Water discharge head for short throw 32 Water discharge head for long throw 33 Joint portion 35 Flange part

Claims

1. A cap for a water-discharging head has a water-discharging outlet at a tip thereof, and a flange portion having a polygonal peripheral surface at a base end thereof and a threaded portion continuous therewith, the water-discharging head being attached by screwing the threaded portion into a joint portion connected to a water supply pipe, the cap being detachably attached to the water-discharging outlet of the water-discharging head, a cap body for covering the water-discharge outlet; and a retaining ring made of resin, connected to the cap body via a string-like portion and into which the threaded portion is inserted when the water-discharge head is attached to the joint portion to retain the cap body; The water-discharging head cap is characterized in that the retaining ring can be deformed to pass through the flange portion and be inserted into the threaded portion.

2. The inner circumferential shape of the retaining ring is a flange portion has a number of vertices corresponding to each vertex of the polygon, and has protruding pieces protruding inward between adjacent vertices, a polygon formed by connecting these adjacent vertices with imaginary lines is larger than the polygon of the flange portion and is large enough for the water outlet to pass through, and a polygon whose sides are inscribed on the protruding pieces is smaller than the polygon of the flange portion, 2. The cap for a water-discharging head according to claim 1, wherein, when the retaining ring is attached, after passing the retaining ring through the water-discharging port, the apex of the inner peripheral shape of the ring is aligned with the apex of the polygon, and the retaining ring is pushed in, so that the protruding piece is deformed and can pass through the flange portion and be inserted into the threaded portion.

3. 3. The water-discharging head cap according to claim 2, wherein the inner periphery of the protruding piece has an arc shape.

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