JP3016985U - Sprinkler head cover - Google Patents

Abstract

(57) [Abstract] [Purpose] A decorative cover that conceals the gap between the sprinkler head and the ceiling hole, a dust-proof cover that prevents dust and dirt from entering the sprinkler head, a protective cover that protects the sprinkler head from external impact, etc. In the sprinkler head cover, the joint strength of the cover should be maximized, and the cover should fall in a short time and within a fixed time when a fire occurs. A gap of 0.05 to 1 mm is formed in a joint portion of the cover or another joint portion to be joined with the cover, and the gap is used for a decomposition portion of a sprinkler head. They are joined with a low melting point alloy having a lower melting point.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cover attached to a sprinkler head for extinguishing a fire.

[0002]

[Prior art]

 The sprinkler head is mounted on the ceiling of the building, but will remain mounted on the ceiling for many years unless it is activated by a fire or destroys the building itself. Therefore, over many years, sprinkler heads become very aesthetically unpleasant because dirt, dust, spider webs, insect carcasses, and other dirt are attached to the heat-decomposable parts and deflectors. In order to prevent dirt from adhering to the sprinkler head, a dust cover can be attached to the bottom of the sprinkler head.

In addition, in the flash type sprinkler head embedded in the ceiling, an annular gap is formed between the hole formed in the ceiling plate and the sprinkler head. The gap not only causes dust and dust in the ceiling to fall into the room, but also makes the interior of the ceiling visible through the gap, which impairs aesthetics. Therefore, in order to cover up this gap, a decorative cover (also called a sealing plate) is attached to the main body and frame of the sprinkler head.

In a building with a high rise and a low ceiling as in recent years, when a long object is walked inside the building, it hits a sprinkler head mounted on the ceiling and the heat-sensitive decomposition portion is deformed. You can destroy it. Then, the valve element held in the heat-sensitive decomposition part may be displaced or come off, causing water to be sprayed even when there is no fire. In order to protect the sprinkler head from the impact of external enemies that may cause an accident such as this, a protective cover is attached to the sprinkler head in a building with a low ceiling.

Sprinkler head covers such as a dustproof cover, a decorative cover, and a protective cover that are attached to these sprinkler heads must be attached so as not to hinder water sprinkling from the sprinkler heads. In other words, when the dustproof cover is attached to the components of the pyrolysis part, the cover should not fall when the pyrolysis part is disintegrated and drop to prevent water spraying, and the cover of the decorative cover or protective cover should be sprinkler. If it is attached to the outer circumference of the head or the cover body, it must be attached at a position where it does not interfere with water spray from the sprinkler head.

However, the cover of the sprinkler head cover (hereinafter simply referred to as “cover”) may not drop together with the heat-decomposable portion, or if the cover is attached to the frame of the sprinkler head or the cover body, it may impede water sprinkling. In case of such a situation, the cover should be dropped first before the heat-sensitive decomposition part of the sprinkler head is decomposed. For that purpose, the cover is bonded to the components of the sprinkler head and the cover body with a low melting point alloy. As the low melting point alloy for joining the cover, one having a melting point lower than that of the low melting point alloy used for the thermal decomposition part must be used. For example, if the melting point of the low melting point alloy used for the thermal decomposition part is 72 ° C., the low melting point alloy used for joining the cover should have a melting point of 57 ° C., which is lower than that.

As described above, many sprinkler head covers have been proposed in the past, which are joined with a low-melting point alloy having a lower melting point than the low-melting point alloy in the heat-sensitive decomposition portion. (Reference: Syokai 53-65697, Syokai 54-49800, Skaikai 4-83268)

[0008]

[Problems to be solved by the device]

 By the way, with the conventional sprinkler head cover, when cleaning the room, the cover sometimes peeled from the joint part with only a light contact such as tapping or wiping off dirt with a waste cloth. In the case of a conventional sprinkler head cover, it took a long time for the cover to drop when a fire occurred, and the drop time varied and was not constant. In other words, the cover that should be dropped prior to the decomposition of the heat-sensitive decomposition part did not easily fall, and during that time there was a problem that the fire became large. The present invention is to provide a cover for a sprinkler head in which the cover is not easily peeled off with a light contact, and when the fire occurs, all of them fall in a short time.

[0009]

[Means for Solving the Problems]

 The present inventor has conducted an earnest research on the cause of the cover being easily peeled off by simply touching the cover of the sprinkler head, and the cause of the cover falling for a long time in the event of a fire and the cause of variations. It was found that the cover could be easily peeled off or the drop time could be varied depending on the bonding state of the low melting point alloy that was bonded to. Therefore, the present inventor completed the present invention by paying attention to the fact that these problems can be solved by optimizing the joint state of the cover.

The present inventor has conducted an experiment for maximizing the joint strength of the cover joined with the low melting point alloy, and as a result, the gap between the joint of the cover and the other joint is 0.05 to 1 mm, preferably Was found to be around 0.1 mm. It is also clear that the amount of low melting point alloy should be constant in order to make the drop time of the cover constant in the event of a fire, and that the amount of low melting point alloy should be as small as possible in order to further shorten the fall time. It was. In other words, the basic technology of the present invention is to produce the strongest bonding strength with a small amount of low melting point alloy.

The present invention provides a sprinkler head cover in which the cover is joined with a low melting point alloy having a lower melting point than the low melting point alloy used in the heat-sensitive decomposition part of the sprinkler head. The sprinkler head cover is characterized in that there is a gap of 0.05 to 1 mm between the other joining portions to be joined and the gap is joined with a low melting point alloy.

In the present invention, as a means for making the gap between the joint portion of the cover and the other joint portion 0.05 to 1 mm, either the cover itself or the other joint portion for joining the cover, Alternatively, a protrusion having a height of 0.05 to 1 mm may be formed on both of them, a bent portion may be formed, or a spacer having a thickness of 0.05 to 1 mm may be installed between these joints. Can be adopted.

In the present invention, the other joint portion which is joined to the cover is a cover body, a heat-sensitive decomposition portion of the sprinkler head, or a component constituting the sprinkler head such as a frame.

[0014]

[Action]

 Since the gap between the cover joint and the other joint that joins the cover is 0.05 to 1 mm, the gap between the cover joint and the other joint is always the strongest bond strength. Will be obtained. Further, if a certain amount of low melting point alloy such as a washer or pellet is installed in the gap and the low melting point alloy is melted, a fixed amount of low melting point alloy can be used to bond the joints.

As a means for supplying the low melting point alloy, a washer-shaped or pellet-shaped low melting point alloy is set in the gap as described above, or a melted low melting point alloy is quantitatively supplied to the gap by a dispenser or joined. It is also possible to employ a method in which a linear low-melting-point alloy is quantitatively supplied after heating the part.

[0016]

【Example】

 The present invention will be described below with reference to the drawings. The sprinkler head cover of the embodiment shown in the figure is a decorative cover that covers the gap between the flash type sprinkler head and the ceiling hole. In the embodiment, as the means for maintaining the gap, the one having the projection formed at the joint portion of the cover is adopted. 1 is an exploded perspective view of a sprinkler head cover of the present invention, FIG. 2 is a front sectional view of the sprinkler head cover of the present invention attached to a flash type sprinkler head, and FIG. 3 is an enlarged view of a joint between the cover and the cover body. FIG.

The sprinkler head cover 1 is composed of a cover 2 and a cover body 3. The cover 2 is in the shape of a dish with its periphery slightly curved upward, and its outer diameter is sufficiently larger than the hole B of the ceiling C. The cover body 3 has a cylindrical shape, and the inner diameter of the cover body 3 is substantially the same as the outer diameter of the flash type sprinkler head. A large number of fitting grooves 4 are formed in the cover body 3 slightly above the center. The fitting grooves are formed at the same pitch as the grooves engraved on the outside of the flash type sprinkler head S, and the cover can be attached at an appropriate position with respect to the flash type sprinkler head.

At the lower part of the cover body 3, three flange-shaped locking portions 5, 5, 5 are intermittently formed, and the distance between the locking portions extends further downward, and the tip is also Flange-shaped joints 6, 6, 6 are formed.

The joint portion 6 is formed with protrusions 7, 7, 7 protruding downward. The height h of the protrusion 7 is 0.05 to 1 mm so that the gap is strongest. The joint portions 6, 6, 6 of the cover body 3 are placed on the cover 2, and the cover 2 and the cover body 3 are joined by the low melting point alloy 8 so as to surround the protrusion.

Here, joining of the cover 2 and the cover body 3 will be described. First, flux is applied to the joint portion of the cover 2 or the joint portion 6 of the cover body 3, or the flux is applied to the entire surface of the washer-shaped low melting point alloy 8 and then, as shown in FIG. The washer-shaped low melting point alloy 8 is fitted into the protrusion 7 formed on the portion 6. Then, the washer-shaped low melting point alloy 8 is placed on the cover 2 at a predetermined position on the cover body 3 in which the protrusions are fitted. At this time, the cover body 3 may be placed on the lower side and the cover 2 may be placed thereon. When the joints of the cover 2 and the cover body 3 are aligned in this manner, the cover body 3 and the cover 2 are uniformly heated in a heating furnace to melt the washer-shaped low melting point alloy 8 , The gaps maintained at the predetermined intervals by the protrusions are joined with a low melting point alloy. If flux remains on the sprinkler head cover after joining, it may corrode the cover or low-melting-point alloy, so clean it with warm water.

Next, the attachment of the sprinkler head cover of the present invention will be described. A pipe (not shown) is laid in the ceiling, and a hole B having a diameter larger than that of the sprinkler head is bored in the ceiling C of the sprinkler head mounting portion. The sprinkler head S is attached to the pipe through the hole. If this is left as it is, a gap will be formed between the hole B in the ceiling and the sprinkler head S, and the appearance will be greatly deteriorated. Therefore, the sprinkler head cover 1 is attached to the sprinkler head through the hole in the ceiling. The sprinkler head cover is attached to the sprinkler head by fitting the fitting groove 4 of the cover body 3 into the groove of the sprinkler head S. At this time, the sprinkler head cover is pushed into the sprinkler head from below, and is inserted until the locking portion 5 of the cover body 3 contacts the lower surface of the ceiling C as shown in FIG.

Since the sprinkler head cover shown in the embodiment has the joint portion 6 below the locking portion 5, when this is attached to the ceiling sprinkler head, a state in which the space between the ceiling C and the cover 2 is slightly open. Becomes Therefore, when a fire occurs and the heat flow of the fire rises from below and flows along the ceiling surface, it enters the inside of the sprinkler head S from the part of the cover 2 and the ceiling C that is slightly open, and the Warm the decomposition part. Then, the abnormally high temperature hot air of the fire directly heats the cover 2 to melt the low melting point alloy 8 that joins the cover 2 and the cover body 3 and drop the cover 2. Then, the heat-sensitive decomposition part of the sprinkler head, which had been warmed by the hot air stream, is decomposed immediately after the cover falls, and the sprinkler head is activated to spray water to quickly extinguish the fire.

Although the decorative cover in which the cover is joined to the cover body has been described in the embodiment, the present invention can be applied to a dust cover or a protective cover that joins the cover to a thermosensitive decomposition part of a sprinkler head or a component such as a frame. Needless to say.

[0024]

[Effect of device]

 As described above, in the sprinkler head cover of the present invention, the gap between the cover joint and the other joint has a gap that maximizes the joint strength, so that even a small amount of the low melting point alloy causes a strong joint. Is obtained. Therefore, the cover will not be easily peeled off even if a slight external impact is applied to the cover. Further, since the sprinkler head cover of the present invention can supply a fixed amount of a low melting point alloy to the joint portion, the heat capacity for melting the low melting point alloy is small, and the cover can be covered in a short time in the event of a fire. It is also highly reliable because it can be dropped.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cover for a sprinkler head according to the present invention.

FIG. 2 is a front sectional view of the sprinkler head cover of the present invention attached to a flash type sprinkler head.

FIG. 3 is an enlarged cross-sectional view of a joint between the cover and the cover body.

[Explanation of symbols]

 1 Sprinkler head cover 2 Cover 3 Cover body 6 Joint 7 Protrusion 8 Low melting point alloy

Claims (9)

[Scope of utility model registration request] 1. A sprinkler head cover in which a cover is joined with a low melting point alloy having a melting point lower than that of a low melting point alloy used in a heat-decomposable portion of a sprinkler head. There is a gap of 0.05 to 1 mm between one of the joints,
A cover for a sprinkler head, wherein the gap is joined with a low melting point alloy. 2. The cover for a sprinkler head according to claim 1, wherein the cover is joined to the cover body. 3. The cover is joined to a component forming a sprinkler head.
Cover for the sprinkler head described. 4. The cover for a sprinkler head according to claim 1, wherein the gap is maintained by a protrusion formed at a joint portion of the cover or at another joint portion that is joined to the cover. 5. The sprinkler head cover according to claim 1, wherein the gap is maintained by a bent piece formed at a joint portion of the cover or at another joint portion that is joined to the cover. 6. The sprinkler head cover according to claim 1, wherein the gap is maintained by a spacer installed between a joint portion of the cover and another joint portion of the cover. 7. The cover for a sprinkler head comprises:
The cover for a sprinkler head according to claim 1, which is a decorative cover that covers a gap between the sprinkler head and the ceiling hole. 8. The sprinkler head cover comprises:
The sprinkler head cover according to claim 1, wherein the sprinkler head is a dust-proof cover that prevents dust and dirt from entering the interior of the sprinkler head. 9. The sprinkler head cover comprises:
The cover for a sprinkler head according to claim 1, which is a protective cover that protects the sprinkler head from an external impact.