JP5977615B2 - Sprinkler head cover and conshielded sprinkler head - Google Patents

Description

  The present invention relates to a sprinkler head cover installed on a fire extinguishing sprinkler head and a conshielded sprinkler head that covers the sprinkler head with a sprinkler head cover.

  The sprinkler head is installed on a ceiling surface or a wall surface in a building, has a nozzle that can be connected to a pipe connected to a water supply source at one end, and a heat-sensitive operation unit at the other end. During normal times, the heat-sensitive operating part supports a valve body that closes the nozzle. As an example, there is a conshielded sprinkler head that is installed in a state of being embedded in a ceiling surface or a wall surface, and the sprinkler head is covered with a sprinkler head cover.

  The conshielded sprinkler head includes a sprinkler head and a sprinkler head cover that is detachably attached to the sprinkler head. The sprinkler head is installed behind the ceiling, and the sprinkler head is covered with a sprinkler head cover in a normal state so that only the cover plate can be seen from the room.

  The conshielded sprinkler head is used as a sprinkler head having excellent design properties, for example, those described in Patent Documents 1 and 2. The conshielded sprinkler head 50 of Patent Document 1 shown in FIG. 6 has a cylindrical shape, a support cup 52 that houses the sprinkler main body 51 inside, and a disk shape that covers the sprinkler main body 51 so as not to be seen from the indoor side. Cover plate 53, and a cylindrical retainer 54 interposed between the cover plate 53 and the support cup 52.

The protrusion formed on the side surface of the retainer 54 and the spiral groove formed on the side surface of the support cup 52 are configured to be screwed together. At the lower end of the retainer 54, a leg 55 with the cover plate 53 is formed to hang down. The front ends of the leg portions 55 are bent to form joint portions 57 that are connected to the cover plate 53 and the low melting point alloy 56.

Since the low melting point alloy 56 has a lower melting point than the low melting point alloy used for the sprinkler body 51, the low melting point alloy 56 to which the cover plate 53 is bonded first melts in the event of a fire. Then, after the cover plate 53 is removed from the retainer 54, the low melting point alloy in the sprinkler body 51 is melted and the sprinkler body 51 is activated.

JP 2011-218062 A JP 2011-172653 A

When constructing the conshielded sprinkler head 50 described above, the sprinkler head main body 51 and the support cup 52 are first installed behind the ceiling. Next, the ceiling board is stretched, and finally the cover plate 53 connected to the retainer 54 is attached to the support cup 52. If the retainer 54 is inserted into the support cup 52 at an angle, the cylindrical portion of the retainer 54 may be temporarily deformed.

Due to this deformation, the leg portion 55 formed by hanging from the cylindrical portion is also deformed. However, since the joint portion 57 at the tip of the leg portion 55 is joined to the cover plate 53 by the low melting point alloy 56, the leg portion 55 is not deformed. However, the low melting point alloy 56 may be peeled off due to an overload due to the deformation of the leg portion 55 or may be cracked, so that the bonding strength between the cover plate 53 and the bonding portion 57 by the low melting point alloy 56 may be reduced. was there.

In view of the above problems, an object of the present invention is to provide a sprinkler head cover in which the strength of the joint between the retainer and the cover plate is improved, and a conshielded sprinkler head including the sprinkler head cover.

In order to achieve the above object, the present invention provides the following sprinkler head cover.
That is, for a sprinkler head cover including a cover plate that covers a sprinkler head installed on a ceiling or a wall surface, and a retainer having a leg portion attached to the sprinkler head and joined by a cover plate and a low melting point alloy, the tip of the leg portion A hole or notch was formed in the joint portion with the cover plate provided in the hole, and the hole diameter or the width of the notch was set to be twice or more the height from the upper surface of the joint portion to the cover plate.
By setting the hole diameter or notch width formed in the joint as described above, in addition to the fillet formed on the outer periphery of the joint, a sufficiently large fillet is also provided inside the hole or notch. Since it is formed, the joint area of the fillet is increased and the joint strength can be improved.
In addition, when joining the joints of the legs and the cover plate with a low melting point alloy, the flux is used to chemically remove the oxide film on the metal surface of the base material and improve the wettability of the low melting point alloy. The component is vaporized from the surface of the low melting point alloy by the heat of the molten low melting point alloy. At this time, if the gas stays in the joint portion of the low melting point alloy and the portion in contact with the cover plate, a void is formed and the joint strength is lowered. In the present invention, by forming a hole or notch in the leg portion and increasing the area of the side surface portion of the low melting point alloy between the joint and the cover plate, the gas in which the flux component has evaporated becomes the side portion of the low melting point alloy. Made it easier to get out of it.

In the present invention, a hole or a notch is formed in the leg, and the width of the joint with the cover plate provided at the tip of the leg is 0.2 to 0.5 times the width of the leg. Is possible.

The width of the joint portion can be reduced by making the width of the joint portion 0.2 to 0.5 times the width of the leg portion by the hole or notch formed in the joint portion of the leg portion. Furthermore, when a hole or a notch is formed from the leg part to the joint part, stress on the leg part due to the deformation of the cylindrical part of the retainer is dispersed, and it is possible to suppress an overload from being applied to the low melting point alloy.

In the present invention, a joint portion with the cover plate is provided at the tip of the leg portion, and the joint portion is bent in the first direction with respect to the leg portion, and is opposite to the first direction. And a second joint portion bent in the direction of.
According to this, the shape of the joint part that combines the first joint part and the second joint part is complicated by the second joint part formed by bending in the opposite direction with respect to the first joint part, and A strong bonding force can be obtained by increasing the length of the fillet and the bonding area by increasing the length of the edge of the bonding portion including the first bonding portion and the second bonding portion.

About the said this invention, the 3rd junction part formed by bending in the same direction as a 1st junction part or a 2nd junction part can be installed and comprised in a leg part.
According to this, when the third joint portion is formed in the same direction as the first joint portion, a space is formed between the first joint portion and the third joint portion, and the gas when the flux component is evaporated by this space is generated. It can be easily removed.

About the said invention, the leg part in which the junction part was formed can be comprised by connecting to a retainer lower end.
According to this, the shape of the joint part of a leg part can be made into a complicated shape by connecting the leg part formed separately from the retainer with a retainer.

According to the conshielded sprinkler head provided with the sprinkler head cover mounted on the sprinkler head as described above, a conshielded sprinkler head that exhibits the above-described effects of the sprinkler head cover can be realized.

As described above, according to the present invention, it is possible to provide a sprinkler head cover in which the strength of the joint between the retainer and the cover plate is improved and a conshielded sprinkler head including the sprinkler head cover.

Sectional view of the sprinkler head with the sprinkler head cover of the present invention attached (A) The expanded sectional view of the leg part of FIG. 1, (b) The enlarged plan view of the leg part of FIG. Exploded sectional view of FIG. (A) Plan view of retainer, (b) Cross section of retainer The perspective view of the leg of other embodiments Sectional view of a conventional conshielded sprinkler head

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.
The sprinkler head of this embodiment is a conshielded sprinkler head A, and includes a sprinkler head 1 and a sprinkler head cover C. Among these, the sprinkler head cover C 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.

The detailed structure and operation of the sprinkler head 1 and the thermal decomposition unit 5 are the same as those described in Japanese Patent Application Laid-Open No. 7-284545 and International Publication WO 2011/125169, and thus detailed description thereof is omitted.

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 a side 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, the engaging portion 14 is inserted into the support cup 2 side. Since the bent portion side of 14 first hits the spiral groove 13, the distal end side of the engaging portion 14 is deformed by elasticity 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.

At the lower part of the retainer 3, there are a flange F formed to extend outward and a leg portion 15 formed to extend downward. The front end of the leg portion 15 is bent in parallel with the flange F or the plane of the cover plate 4, and serves as a joint 16 with the cover plate 4. The cover plate 4 and the joint 16 are joined by a low melting point alloy 17.

A cutout 18 is formed in the joint portion 16, and the width W1 of the cutout 18 is a height H from the upper surface 161 of the joint portion 16 to the cover plate 4 (the thickness of the joint portion 16 and the protrusion 20 described later). It is more than twice the dimension including the height. More specifically, when the height H is 1 mm, the width of the notch 18 is 2 mm or more.

The width W2 of the joint portion 16 is 0.2 to 0.5 times the width of the leg portion 15 (W1 + 2 × W2). More specifically, when the width of the leg portion 15 is 10 mm, for example, the width W2 of the joint portion 16 is 2 to 5 mm. More preferably, it is 3 to 4 mm. At this time, the width W1 of the notch 18 is 4 to 2 mm.

When the edge length of the joint portion 16 increases due to the notch 18, the area of the fillet 19 also increases, and the surface of the fillet 19 in which the gas evaporated from the flux component on the surface of the low melting point alloy 17 is the side surface portion of the low melting point alloy 17. It becomes easy to come off. Further, since the fillet 19 made of the low melting point alloy 17 is also formed at the edge of the notch 18, the length of the fillet 19 formed at the edge of the joint 16 increases, so that the cover plate 4 and the joint 16 by the fillet 19 are increased. The bonding area can be increased and the bonding strength can be increased.

A plurality of protrusions 20 are formed on the cover plate 4 so as to protrude from the joint 16 toward the cover plate 4 in order to fill a sufficient amount of the low melting point alloy 17 between the joint 16 and the cover plate 4. The fillet 19 formed on the side surface of the cover plate 4 and the joint portion 16 by the protrusion 20 can be formed high.

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. As described above, the joint 16 described above is disposed inside the cover plate 4 and joined by the low melting point alloy 17. As the low melting point alloy 17, an alloy having a melting point lower than that of the low melting point alloy 8 used in the sprinkler head 1 is used.

Example of other embodiment (FIG. 5)
Another embodiment of the joint portion 16 will be described with reference to FIG. In FIG. 5A, the notch 18 </ b> A extends to the leg portion 15. FIG. 5B shows a hole 18B formed in place of the notch. Thereby, the deformation of the leg portion 15 is absorbed by the notches 18A and the holes 18B, and the load on the low melting point alloy 17 is suppressed.

In FIG. 5C, two joint portions 16 are formed by the notches 18C, and the other joint portion 16B is bent to the opposite side to the joint portion 16A with respect to one joint portion 16A. Thereby, a 1st junction part and a 2nd junction part can be formed by junction part 16A, 16B. Moreover, the gas by a flux component can be made easy to escape from the edge of a junction part (16A, 16B) by forming the 2nd junction part (16B) on the opposite side with respect to the 1st junction part (16A).

In FIG. 5 (d), a U-shaped hole 18 </ b> D is formed in the joint portion 16, and a joint portion 16 </ b> D is formed by bending the inside of the notch 18 </ b> D in the direction opposite to the joint portion 16.

FIG. 5E shows a case where two notches 18E are formed in the joint 16 and the intermediate joint is bent to the opposite side to the joints at both ends. Thereby, the junction part 16 can comprise a junction part of both ends as a 1st junction part and a 3rd junction part, and an intermediate | middle junction part as a 2nd junction part.

Since the joint described above is difficult to form integrally with the retainer 3 because of its complicated shape, the leg 15 is formed separately from the retainer 3 so that the leg 15 and the retainer 3 are connected. It can also be configured.
Further, in the modified examples of the above-described figures (c) to (e), the leg portion 15 itself can be made to stand on its own, so that, for example, the cover plate 4 and the leg portion 15 joined with the low melting point alloy 17 are connected to the retainer 3. It can also be configured.

1 Sprinkler head
2 Support cup
3 Retainer
4 Cover plate
5 Thermal decomposition section
15 legs
16 joints
17 Low melting point alloy
18 Notch
19 Fillet
20 protrusions
A Conshielded sprinkler head
C Sprinkler head cover

Claims (6)

A cover plate that covers the sprinkler head installed on the ceiling or wall;
A retainer having legs attached to the sprinkler head and joined by a cover plate and a low melting point alloy;
For sprinkler head covers with
Has a hole or notch in the joint with the cover plate provided at the tip of the leg ,
The hole or notch is formed from the leg to the joint ;
A sprinkler head cover characterized in that the hole diameter or the width of the notch is at least twice the height from the upper surface of the joint to the cover plate.
The sprinkler according to claim 1, wherein a hole or a notch is formed in the leg, and the width of the joint with the cover plate provided at the tip of the leg is 0.2 to 0.5 times the width of the leg. Head cover.
The joint portion is formed with a first joint portion bent in a first direction with respect to the leg portion and a second joint portion bent in a direction opposite to the first direction. Item 3. The sprinkler head cover according to Item 2.
The sprinkler head cover according to any one of claims 1 to 3, wherein a third joint portion formed by bending in the same direction as the first joint portion or the second joint portion is installed on the leg portion.
The sprinkler head cover according to any one of claims 1 to 4, wherein the leg portion on which the joint portion is formed is connected to the lower end of the retainer.
A conshielded sprinkler head comprising the sprinkler head cover according to any one of claims 1 to 5 attached to the sprinkler head.

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