JP2013034853A - Sprinkler head cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sprinkler head cover for shortening the time from fire occurrence to the operation of a sprinkler head without deteriorating the superiority of design in the sprinkler head.SOLUTION: In the sprinkler head cover, the sprinkler head 1 is stored inside a cylindrical member, a cover plate 4 for covering the sprinkler head 1 is arranged on the lower side of the cylindrical member, and the cylindrical member and the cover plate 4 are joined to each other with a low-melting-point alloy. The cylindrical member includes: a support cup 2 to be connected to the sprinkler head 1; and a retainer 3 having the cover plate 4 at the lower end. The support cup 2 includes an air flow-out port 12B, and the retainer 3 includes an air flow-in port 17. The support cup 2 and the retainer 3 are configured to be removable.

Description

The present invention relates to a sprinkler head cover in which a sprinkler head is usually covered with a cover and the cover falls in a fire.

The sprinkler head cover is installed on the ceiling or on the sprinkler head, and always covers the sprinkler head with the cover plate. In the event of a fire, the cover plate falls and the internal sprinkler head is exposed, making the sprinkler head ready for operation. .

An example of a conventional sprinkler head cover is shown in FIG. 9 (see, for example, Patent Document 1). The sprinkler head cover of FIG. 9 has a flange 51 at the lower end of a cylindrical main body 50 connected to the sprinkler head. A cover 52 that covers the sprinkler head is connected to the flange 51 via a low melting point alloy 53 and a locking member 54.

A plurality of openings 55 are formed on the side surface of the main body 50, so that a hot air current drifting on the lower surface of the ceiling after the cover 52 is dropped by the heat of the fire can be taken into the main body 50 and discharged from the opening 55. Thereby, the action | operation of the sprinkler head arrange | positioned inside the main body 50 is promoted.

JP 2003-245371 A No. 7-37638

In the above sprinkler head cover, it was possible to guide the hot air flow into the main body 50 after the cover 53 dropped, but in order to further accelerate the operation of the sprinkler head, heat was applied to the sprinkler head before the cover 53 dropped. I have to tell you.

However, since the amount of airflow that can flow into the main body 50 from between the cover 52 and the flange 51 is small, the airflow discharged from the opening 55 is also small, and the hot airflow under the ceiling can be smoothly introduced and discharged into the main body 50. Without this, the air flow stayed in the main body 50, and the heat could not be sufficiently transferred to the sprinkler head.

In order to solve this problem, if the distance between the cover 52 and the flange 51 is increased, the amount of hot air flowing into the main body 50 can be increased. However, if the distance between the cover 53 and the flange 51 is increased, the sprinkler is obliquely applied. When the head cover is viewed, there is a problem that the sprinkler head inside the main body 50 can be seen and the design advantage due to the installation of the sprinkler head cover is significantly reduced.

In view of the above problems, an object of the present invention is to provide a sprinkler head cover that can shorten the time from the occurrence of a fire to the operation of the sprinkler head without impairing the design advantage of the sprinkler head cover.

In order to achieve the above object, the present invention provides the following sprinkler head cover.
A sprinkler head is housed inside the tubular member, a cover plate that covers the sprinkler head is disposed below the tubular member, and the tubular member and the cover plate are joined by a low melting point alloy. The cylindrical member consists of a support cup connected to the sprinkler head and a retainer with a cover plate at the lower end, forming an airflow outlet in the support cup, forming an airflow inlet in the retainer, and attaching and detaching the support cup and retainer It is a sprinkler head cover characterized by being configured.
According to this, by forming the airflow outlet in the support cup and forming the airflow inlet in the retainer, the flow amount of the airflow inside the cylindrical member was increased. More specifically, by forming an air flow outlet in the support cup, the gas in the retainer and the support cup can be easily discharged to the outside. The hot air current drifting on the lower surface of the ceiling during a fire flows into the retainer from between the cover plate and the retainer. This hot airflow passes through the retainer and the support cup and is discharged from the airflow outlet to the outside. Since the external gas is drawn into the retainer from the airflow inlet of the retainer by being attracted by the airflow flowing in the retainer, the amount of the airflow that passes through the retainer and the support cup and is discharged to the outside increases. This increases the amount of airflow passing through the retainer and support cup, prevents the airflow from staying in the retainer and support cup, and prevents the hot air current from being generated by the fire from the stage before the cover plate drops. Heat can be transmitted to encourage operation.

Also, since the airflow heated by the fire rises, the hot airflow flowing in from the retainer placed near the ceiling plate without going against the flow is discharged from the support cup placed behind the ceiling. By forming the airflow passage path toward the airflow, it is possible to suppress the flow resistance of the hot airflow and promote the flow of the airflow in the cylindrical member.

About the said invention, it can comprise by the hole or notch which perforated | pierced the airflow exit to the upper end surface of the support cup.
According to this, by providing the hole or notch in the upper end surface of the support cup, the hot airflow that has flowed into the retainer can be flowed upward, and heat can be transmitted to the heat sensitive part of the sprinkler head.

In the present invention, the air flow inlet can be constituted by a hole or a notch formed in the side surface of the retainer.
According to this, in addition to the airflow that flows into the retainer from the gap between the cover plate and the ceiling by providing a hole or notch on the side of the retainer, the airflow also enters the retainer from the hole or notch on the side of the retainer. Can be introduced, and the amount of airflow in the retainer can be increased.

The present invention can be configured by a hole or a notch formed in a flange formed by extending the airflow inlet outward at the lower part of the retainer.
According to this, by providing a hole or notch in the flange, the hot air flow staying on the lower surface of the ceiling in the event of a fire passes through the hole or notch in the flange and is introduced into the retainer from the hole or notch on the side of the retainer It becomes possible to do.

About the said invention, the deflection | deviation part which changes the flow of an airflow can be installed in the vicinity of an airflow inlet.
According to this, the direction of the airflow that has collided with the deflecting portion can be changed in the direction of the hole or notch on the side surface of the retainer by the inclination of the deflecting portion, and the airflow can be introduced into the retainer.

In the present invention, it is possible to install a stopper that prevents the support cup from blocking the air flow inlet of the retainer.
According to this, the air flow inlet can be always opened by installing the stopper. As a specific configuration example of the stopper, a protrusion is formed near the airflow inlet so that the lower end of the support cup can be locked, or a protrusion is formed on the support cup side so that the upper end of the retainer can be locked can do. Or it is also possible to use the above-mentioned deflection | deviation part as a stopper.

About this invention, it can comprise by installing the ceiling surface contact part in the cover plate.
According to this, a flange is unnecessary because the ceiling surface contact portion is installed on the cover plate, and more airflow can be allowed to flow into the retainer by eliminating the flange.

About this invention, it can comprise by installing the ceiling surface contact part in the cover plate junction part of a retainer.
According to this, by providing the ceiling surface contact portion in the cover plate joint portion, the heat absorbed by the ceiling surface contact portion can be transmitted to the low melting point alloy of the cover plate joint portion. Promote and accelerate the fall of the cover plate.

As described above, according to the present invention, a hot air stream can be introduced into the retainer before the cover plate drops in the event of a fire, and thus heat can be transferred to the heat sensitive part of the sprinkler head. When the cover plate falls, the sprinkler head can be operated without delay.

Sectional drawing of the sprinkler head in which the sprinkler head cover of 1st Embodiment was installed XX sectional view of FIG. Plan view of FIG. Exploded sectional view of sprinkler head cover 1 is a cross-sectional view of the cover plate of FIG. Sectional view of the sprinkler head of FIG. Sprinkler head cover plan view and YY sectional view of the second embodiment Sectional drawing of the sprinkler head cover of 3rd Embodiment Exploded sectional view of a conventional sprinkler head cover XX sectional view when the sprinkler head is arranged on the back side of the ceiling

1st Embodiment (FIGS. 1-6)
The sprinkler head cover C of the first embodiment is installed on the sprinkler head 1 and includes a support cup 2, a retainer 3, and a cover plate 4.

The sprinkler head 1 is installed on a ceiling surface or a wall surface and is connected to piping on the back of the ceiling (indicated by a two-dot chain line in FIG. 1). The sprinkler head 1 has a thermal decomposition portion 5 inside, and the thermal decomposition portion 5 holds a valve body 7 installed at the end of the nozzle 6 on the nozzle 6 side. The thermal decomposition part 5 is provided with a cylinder 9 filled with a low melting point alloy 8, and the thermal decomposition part 5 is decomposed by melting the low melting point alloy 8 in the cylinder 9 by the heat of a fire. Then, water is released from the nozzle 6 by releasing the valve body 7 held in the thermal decomposition unit 5. Since the detailed structure of the sprinkler head 1 and the thermal decomposition unit 5 is described in Japanese Patent Laid-Open No. 7-284545, detailed description thereof is omitted.

A male screw 10 is connected to the outside of the nozzle 6 for connection to the above-described piping. A support cup 2 is fixedly installed on the root portion 11 of the male screw 10.

The support cup 2 is cylindrical and has an end face 12 on the upper end side. A hole 12 </ b> A is formed in the end surface 12, and the male screw 10 of the sprinkler head 1 is inserted into the hole and protrudes to the outside of the end surface 12. A plurality of air flow outlets 12B are formed around the hole 12A. The larger the opening area of the air flow outlet 12B is, the more effective the exhaust of the gas in the support cup 2 and the retainer 3 is.

A spiral groove 13 that can be detachably connected to the retainer 3 is formed on the side surface of the support cup 2.

The retainer 3 has a cylindrical shape, and an engaging portion 14 that can be screwed into the spiral groove 13 of the support cup 2 is formed on the outer surface. The engaging portion 14 has a shape that protrudes obliquely downward on the spiral groove 13 side and is cut and raised. When the retainer 3 is attached to the support cup 2, it is engaged when the retainer 3 is inserted inside the support cup 2. Since the bent portion side of the portion 14 first hits the spiral groove 13, the distal end side of the engaging portion 14 is elastically deformed and can pass over the spiral groove 13. On the other hand, when the retainer 3 is removed from the support cup 2, even if the retainer 3 is pulled downward, the tip of the engaging portion 14 is engaged with the spiral groove 13 and cannot be pulled out. The engaging part 14 is rotated along 13 and removed.

Below the retainer 3, a flange 15 formed to extend outward is installed. The flange 15 is a ceiling surface contact portion, whereby a gap 20 can be secured between the edge of the cover plate 4 and the ceiling T. A cover plate joint 16 is formed to hang from the flange 15. An airflow inlet 17 is formed between the flange 15 and the engaging portion 14, and a plurality of airflow inlets 17 are provided on the side surface of the retainer 3. As the opening area of the airflow inlet 17 is larger, the effect of introducing the gas into the support cup 2 and the retainer 3 is improved. Further, the air flow inlet 17 is installed at a position close to the flange 15 so that the height difference between the air flow inlet 17 and the air flow outlet 12B becomes large, and the air flow directed upward (on the end face 12 side) is generated inside the support cup 2 and the retainer 3. Easy to form.

A stopper 18 is formed in the vicinity of the airflow inlet 17 so that the end of the support cup 2 can be locked, and the airflow inlet 17 is prevented from being blocked by the support cup 2. In the present embodiment, the stopper 18 is provided on the retainer 3, but is not limited thereto, and can be installed on the support cup 2 side, for example. Specifically, the support cup 2 can be configured by forming a protrusion that locks the upper end of the retainer 3 and restricts movement toward the end face 12.

The cover plate 4 is a thin plate formed in a disk shape, and the outer peripheral edge is bent toward the retainer 3 side. Inside the cover plate 4, the above-described cover plate joint 16 is disposed and joined by a low melting point alloy 19. As the low melting point alloy 19, an alloy having a lower melting point than the low melting point alloy 8 used in the sprinkler head 1 is used.

Subsequently, the operation of the first embodiment will be described.

As shown in FIG. 1, the sprinkler head cover C is installed on the sprinkler head 1 connected to the piping on the back of the ceiling, and is installed with the upper surface of the flange 15 of the retainer 3 in contact with the lower surface of the ceiling T. A gap 20 is provided between the lower surface of the flange 15 and the edge of the cover plate 4, so that airflow can flow into the retainer 3 from the gap 20.

When a fire occurs, the thermal airflow from the fire rises and stays on the lower surface of the ceiling T. In FIG. 2, the hot air flow indicated by the dotted line flows into the retainer 3 from the gap 20 and is discharged from the air flow outlet 12 </ b> B of the support cup 2, and an air flow is generated from the lower end side of the retainer 3 toward the upper end side of the support cup 2. The airflow is induced by the airflow and flows into the retainer 3 from the airflow inlet 17 provided on the side surface of the retainer 3, and the amount of airflow in the retainer 3 increases. The airflow does not stagnate in the retainer 3 due to the increase in the flow rate of the airflow, and the hot airflow on the lower surface of the ceiling flows into the retainer 3 through the gap 20 and is discharged from the airflow outlet 12B without stagnation. Then, heat is propagated from the hot air flow to the low melting point alloy 8 in the cylinder 9.
In the above, the distance between the gap 20 and the cylinder 9 is close, and the hot airflow passing through the gap 20 is easy to transfer heat to the cylinder 9, but the sprinkler head 1 is located on the ceiling T as shown in FIG. When installed on the far side, that is, when the distance from the gap 20 to the cylinder 9 is long, the hot air flowing in from the gap 20 is not easily transmitted to the cylinder 9. In this case, by taking the airflow into the retainer 3 from the airflow inlet 17, the flow amount of the airflow in the retainer 3 can be increased and the heat of the hot airflow can be transmitted to the cylinder 9.

Since the low melting point alloy 19 joining the retainer 3 and the cover plate 4 has a lower melting point than the low melting point alloy 8, it melts at an earlier stage than the low melting point alloy 8 and the cover plate 4 falls (FIG. 5). When the cover plate 4 is dropped, the sprinkler head 1 is exposed, and heat is easily absorbed from the hot air current on the lower surface of the ceiling T, and the low melting point alloy 8 in the cylinder 9 is melted to cause heat sensitivity in the sprinkler head 1. The disassembly unit 5 is disassembled.

The nozzle 6 is opened by the operation of the thermal decomposition unit 5 to release water, and the released water collides with the deflector D and scatters in all directions. This reduces the fire (Figure 6).

Second Embodiment (FIG. 7)
The sprinkler head cover of the second embodiment is provided with the air flow inlet 17 of the sprinkler head cover of the first embodiment also on the flange 15 and is shown in FIG. FIG. 7 will be described with reference to a plan view of the retainer 3 to which the cover plate 4 is joined and a YY cross-sectional enlarged view of the plan view. In the following, parts having the same configurations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

FIG. 7A-1 is a plan view of the retainer 3 to which the cover plate 4 is joined, and FIG. 7A-2 is a YY sectional view of FIG. In this case, a plurality of holes 17A are formed in the flange 15, and the airflow passing through the gap 20 can be introduced into the retainer 3 from the holes 17 on the side surface of the retainer 3 through the holes 17A. Further, a deflection plate 21 is provided in the vicinity of the hole 17, and it is possible to guide the hot airflow that has passed through the hole 17 </ b> A formed in the flange 15 to the inside of the retainer 3 by the deflection plate 21.

As a modification of the above, FIGS. (B-1) and (b-2) are those in which a plurality of notches 17B are formed in the flange 15. FIG. Further, as a similar modification, FIGS. (C-1) and (c-2) show a plurality of holes 17C drilled from the flange 15 to the side surface of the retainer 3 as air flow inlets, or FIG. ), (D-2), a plurality of notches 17D formed from the flange 15 to the side surface of the retainer 3 can be configured as air flow inlets. What formed the hole 17C and the notch 17D from these flanges 15 to the side surface of the retainer 3 has holes and notches that allow airflow to pass as compared with the configurations of (a-1) and (b-1) described above. The resistance of the flow of the hot air current can be reduced by increasing the area. Thereby, the loss of the flow of the airflow into the retainer 3 is reduced, and the flow amount of the airflow can be increased.

Third embodiment (FIG. 8)
The sprinkler head cover of the third embodiment has a form without the flange 15 of the sprinkler head cover of the first embodiment. Since there is no flange 15, more thermal airflow drifting on the lower surface of the ceiling during a fire can be introduced into the retainer 3. However, if the outer peripheral edge of the cover plate 4 is in contact with the lower surface of the ceiling T due to the absence of the flange 15, the gap 20 for taking the air current into the retainer 3 is eliminated. In FIG. 8A, a plurality of protrusions 4 </ b> A in contact with the lower surface of the ceiling T are installed on the outer edge of the cover plate 4.

FIG. 6B shows a protrusion 16A in which the cover plate joint 16 of the retainer 3 is extended to the lower surface of the ceiling so that the gap 20 can be secured by bringing the tip of the protrusion 16A into contact with the lower surface of the ceiling T. It is. In addition to this, the heat absorbed by the protrusion 16A is propagated to the low melting point alloy 19, so that the melting of the low melting point alloy 19 is promoted and the cover plate 4 can be quickly dropped.

In FIG. 2C, a gap 20 can be secured by forming a protrusion 3A (ceiling surface contact portion) formed to protrude outward on the side surface of the retainer 3 and bringing it into contact with the lower surface of the ceiling T. Further, if the ring member 30 is installed on the protrusion 3A, the rigidity of the protrusion 3A can be increased. Further, by installing the inner peripheral edge of the ring member 30 apart from the side surface of the retainer 3, a space 31 through which airflow can pass can be formed between the inner peripheral side of the ring member 30 and the side surface of the retainer 3. Thereby, the protrusion 3 </ b> A can have rigidity, and more airflow on the lower surface of the ceiling can be introduced into the retainer 3.

In the above embodiments (a) to (c), when the lower end 3B of the cylindrical portion of the retainer 3 shown in FIG. 8A is configured to be positioned above the upper surface of the ceiling T, the gas on the upper surface of the ceiling is The resistance of the airflow when passing under the lower end 3B and flowing into the retainer 3 can be reduced. As a result, more gas can be introduced into the retainer 3.

1 Sprinkler head
2 Support cup
3 Retainer
4 Cover plate
12 End face
12A hole
12B Airflow outlet
13 Spiral groove
14 Engagement part
15 Flange (ceiling surface contact part)
16 Cover plate joint
17 Airflow inlet
18 Stopper
19 Low melting point alloy
20 Clearance
21 Deflection plate (deflection part)

Claims (10)

A sprinkler head is housed inside the tubular member, a cover plate that covers the sprinkler head is disposed below the tubular member, and the tubular member and the cover plate are joined by a low melting point alloy. The cylindrical member consists of a support cup connected to the sprinkler head and a retainer with a cover plate at the lower end, forming an airflow outlet in the support cup, forming an airflow inlet in the retainer, and attaching and detaching the support cup and retainer A sprinkler head cover that is configured to be possible.
The sprinkler head cover according to claim 1, wherein the airflow outlet is a hole or a notch formed in the upper end surface of the support cup.
The sprinkler head cover according to claim 1 or 2, wherein the airflow inlet is a hole or a notch formed in a side surface of the retainer.
The sprinkler head cover according to any one of claims 1 to 3, wherein the airflow inlet is a hole or notch formed in a flange formed by extending outwardly at a lower portion of the retainer.
The sprinkler head cover according to any one of claims 1 to 4, wherein the airflow inlet is a hole or a notch drilled from the flange to the side surface of the retainer.
The sprinkler head cover according to any one of claims 1 to 5, wherein a deflecting portion that changes the flow of the airflow is installed in the vicinity of the airflow inlet.
The sprinkler head cover according to any one of claims 1 to 6, further comprising a stopper that prevents the support cup from blocking the air flow inlet of the retainer.
The sprinkler head cover according to any one of claims 1 to 7, wherein the ceiling surface contact portion is installed on the cover plate.
The sprinkler head cover according to any one of claims 1 to 8, wherein the ceiling surface contact portion is installed at a cover plate joint portion of the retainer.
Any one of claims 1 to 9, wherein a ring member is installed at a ceiling surface contact portion formed to project outward from below the air flow inlet on the side surface of the retainer, and an inner peripheral edge of the ring member is spaced apart from the side surface of the retainer. A sprinkler head cover according to claim 1.

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