JP3325696B2 - Flash sprinkler head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprinkler head for extinguishing a fire, and more particularly to a flash sprinkler head in which a deflector drops by a certain distance and stops when a fire occurs, and water is sprayed in all directions by the dropped deflector.

[0002]

2. Description of the Related Art Flash type sprinkler heads are:
There is a cylindrical frame, in which a deflector having a large number of blades is installed. The deflector is movable, and a valve body is fixed on the deflector. In normal times, the valve body closes a valve seat via a packing. The valve body is held in a pyrolysis part engaged with the lower part of the frame. When the flash type sprinkler head is operated, the thermal decomposition part is completely scattered outside, the deflector falls along the frame, and the upper part of the deflector is stopped by being locked by the lower end of the frame. Then, the water spouted from the valve seat hits the deflector that stopped on the way and was sprayed in all directions.

[0003] The flash-type sprinkler head has a pyrolysis portion suspended from the lower end of the frame, and most of the pyrolysis portion is exposed to the outside of the frame.

[0004] Generally, a sprinkler head is installed on a ceiling in a room, and an aesthetic appearance like interior design is required. However, in the flash sprinkler head, since the thermal decomposition portion exposed from the lower end of the frame is composed of a large number of components, this thermal decomposition portion is not aesthetically good. The thermal decomposition part is an important component, but is vulnerable to external impact. If an object hits the thermal decomposition part, it may break down and spray water even if it is not a fire, causing water damage. Therefore, in a conventional flash sprinkler head, a heat collecting plate attached to the lower end of the thermal decomposition portion is formed in a bowl shape, and the exposed heat decomposition portion is concealed and protected by the heat collecting plate. (Reference: JP-B-53-8239, 55-545)
No. 25, No. 56-49636)

By the way, the sprinkler head must be able to operate quickly and spray water when a fire occurs. In other words, if the sprinkler head is activated and water is sprayed while the fire is small, and the initial fire extinguishing is performed, the disappeared area will be small and the human body will not be endangered by the smoke of the fire. Therefore, recently, a so-called “fast-moving type” which operates quickly has been required.

[0006] In order to make the sprinkler head a fast-moving type, it is necessary to quickly propagate the heat of the fire to the heat acting portion of the thermal decomposition portion, that is, a low melting point alloy which is melted by heat and decomposes the thermal decomposition portion. . There is a heat collecting plate as a means for transmitting the heat of fire to the low melting point alloy. The heat collecting plate is attached to the lower end of the thermal decomposition part, and the heat of the fire is collected by the heat collecting plate,
This is propagated to the low melting point alloy.

[0007] The larger the surface area of the heat collecting plate attached to the thermal decomposition part, the larger the amount of heat collected. Therefore, in the conventional flash type sprinkler head, a heat collecting plate formed by drawing one large disk into a bowl shape is attached to the thermosensitive decomposition part. This bowl-shaped heat collecting plate not only has a heat collecting effect, but also has a concealing and protecting effect of the above-mentioned thermosensitive decomposition part.

The flash type sprinkler head provided with such a large bowl-shaped heat collecting plate has the effect of shortening the operation time as compared with the head without the heat collecting plate, but still requires a short-time operation which is recently required. Did not reach the fast-acting sprinkler head. Therefore, to further enhance the heat collecting effect, a sprinkler head has been proposed in which a plurality of disk-shaped heat collecting plates are provided to increase the surface area of the heat collecting plates. (Reference: Japanese Utility Model Laid-Open No. 2-63870, 109)
No. 661).

[0009]

By the way, the supply of heat for melting the low melting point alloy in the heat-decomposition portion not only involves the propagation of the heat collected by the heat collecting plate, but also the fire of the components constituting the heat-decomposition portion. An important factor is the supply of heat by the application of the hot air flow and the propagation of the hot air flow to the low melting point alloy or the direct application of the hot air flow to the installation portion of the low melting point alloy.

In the flash sprinkler head proposed in Japanese Utility Model Application Laid-Open No. 2-109661, the heat-sensitive decomposition portion is exposed, so that the hot airflow can directly hit the heat-sensitive decomposition portion. Since the heat leaked out and heat did not stay around the heat-sensitive decomposition part, it was not possible to sufficiently heat the parts of the heat-sensitive decomposition part and the parts where the low-melting-point alloy was installed. In addition, since the flash-type sprinkler head has a heat-sensitive decomposition portion exposed, the flash-type sprinkler head is not only impaired in appearance but also vulnerable to external impact.

The flash type sprinkler head disclosed in Japanese Utility Model Application Laid-Open No. 2-63871 has an aesthetic effect because the uppermost heat collecting plate among a plurality of heat collecting plates is formed in a bowl shape to reduce the exposure of the heat-sensitive decomposition portion. In addition, the hot air flow that has flowed in is difficult to flow out. However, in this flash type sprinkler head, since the uppermost heat collecting plate has a bowl shape, the hot air flow rises along the bowl-shaped outer wall, and it is difficult for the hot air flow to enter the interior where the thermosensitive decomposition part is incorporated, Therefore, the heating of the thermal decomposition part and the low-melting-point alloy installation part by the hot air flow was not sufficient.

[0012]

SUMMARY OF THE INVENTION In a conventional flash sprinkler head having a plurality of heat collecting plates,
The reason why the operation time is not so fast is that the thermal decomposition part is exposed too much and the heating by the hot air flow cannot be performed sufficiently, and the bowl-shaped heat collecting plate cannot allow the hot air flow to flow inside. From this, the present inventor is easy to let the hot air flow in spite of reducing the exposure of the thermal decomposition part,
In addition, the present inventors have made intensive studies on making it easier to muffle the inflow of the flowing hot air and completed the present invention.

The present invention relates to a flash type sprinkler head having a structure in which a deflector held by a thermal decomposition part drops and stops by a certain distance when a fire occurs.
A plurality of disc-shaped heat collecting plates are installed at the lower end of the thermosensitive decomposition part, and the thermosensitive decomposition part is surrounded by a cover attached to the frame, and a hot air flow can flow into the cover below the cover The flush sprinkler head is characterized in that an inflow portion is formed, and the lower end of the cover is located above the deflector that has stopped falling so as not to hinder the spraying of water by the deflector.

In the present invention, the inflow portion into which the hot air flow on the lower side of the cover can flow into the inside of the cover may be a gap between the cover and the heat collecting plate, or a plurality of holes formed in a lower portion of the cover.

[0015]

[Function] Since the thermal decomposition portion is surrounded by the cover, the thermal decomposition portion can be concealed, and the thermal decomposition portion, which is vulnerable to external impact, is protected, and the hot air flow that flows into the interior does not easily flow out. I will be muffled inside. Further, since the inflow portion is formed on the lower side of the cover, the hot air flow easily flows into the inside of the cover.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a front half sectional view of a first embodiment of the present invention, and FIG.
FIG. 3 is a front cross-sectional view of the second embodiment of the present invention during operation, and FIG. 4 is a front cross-sectional view of the second embodiment during operation.

The flash sprinkler head according to the first embodiment shown in FIGS. 1 and 2 comprises a main body 1, a frame 2, a valve 3, a deflector 4, a thermosensitive decomposition part 5, and a cover 6.

The main body 1 has a water guide hole 7 formed in the center, a lower end portion serving as a valve seat 8, a male screw 9 screwed into the upper outer periphery, and a flange 10 at the lower end.

The frame 2 has a cylindrical shape, the lower end of which is an inner flange 11, and the upper end is screwed to the flange 10 of the main body 1.

The valve body 3 is covered with a packing at the upper part, and seals the valve seat 8 of the main body 1 in a normal state.

The deflector 4 has a disk shape and has a large number of blades formed around it, and is suspended by a ring 12 during operation. The deflector 4 is installed below the valve body 3.

The thermal decomposition part 5 is installed at the lower part of the frame 2 and holds the valve body 3 via the guide post 13. Well-known about the thermosensitive decomposition part (Japanese Patent Publication No. 58-3)
6985), and a detailed description thereof will be omitted here. In the thermal decomposition part, the molten state of the low melting point alloy is important. When a fire occurs, the low-melting point alloy melts at an abnormally high temperature of the fire, causing the balance of the heat-sensitive decomposition part to be lost and the heat-sensitive decomposition part to decompose. The low melting point alloy in the pyrolysis part is placed in a state of being filled in a cylinder or joining two metal plates. In the embodiment, the cylinder is filled with the low melting point alloy 14.

At the lower end of the thermal decomposition part 5, two disk-shaped heat collecting plates 15, 16 are attached. The upper heat collecting plate 16 has an outer diameter larger than that of the lower heat collecting plate 15, but this allows the hot air flow rising from below to impinge on the upper heat collecting plate, and the heat at the upper portion is increased. This is for the purpose of efficiently collecting the information.

The cover 6 has a cylindrical shape and is attached to the frame 2. The attachment of the cover to the frame is performed by fitting an annular protrusion 18 of the cover into an annular groove 17 engraved in the frame. Cover 6
Conceals the thermal decomposition part 5, and an inflow part 19 of a hot air flow is formed on the lower side of the cover. The inflow portion of the first embodiment is a gap 20 formed between the lower end of the cover 6 and the upper heat collecting plate 16. In this embodiment, the lower end of the cover 6 is located at a position that does not hinder the spraying of water when the flush sprinkler head is operated.

Next, the operation of the flash sprinkler head of the present invention when a fire occurs will be described.

When a fire occurs, the hot air flows from below or from the side as shown by arrows. The hot airflow flowing from below hits the plurality of heat collecting plates 15 and 16, heats these heat collecting plates, and transmits the heat to the low melting point alloy 14. Further, the hot airflow that has risen from below and hits the heat collecting plate flows laterally along the heat collecting plate, and flows into the cover 6 from the gap 19 that is an inflow portion. Then, the hot airflow flowing from the side or obliquely downward also flows into the cover from the gap 19.

The hot air flowing from the inflow portion is trapped inside the cover, heats each component of the thermosensitive decomposition portion, and the heat from each component propagates to the low melting point alloy. Further, the hot air flow flowing from the gap 19 directly hits the low melting point alloy installation portion and heats the portion.

When the low melting point alloy melts due to heat propagation from a plurality of heat collecting plates, heat propagation from each part of the heat sensitive decomposition part, and direct heating to the low melting point alloy installation part, balance of the heat sensitive decomposition part is obtained. The thermal decomposition part decomposes, and all the parts constituting the thermal decomposition part fall down. Then, the thermosensitive decomposition part 5 is guided through the guide post 13.
As a result, the deflector 4 held in the step 2 falls, and the ring 12 also slides down along the inner wall of the frame 2 and engages with the inner flange 11 of the frame 2 to stop falling.

At this time, since the valve body 3 integrated with the deflector 4 also falls, the valve seat 8 is opened, and water flows through the water introduction hole 7.
Gushing from As shown in FIG. 2, the jetted water hits the deflector 4 stopped halfway and is sprayed in all directions. At the time of spraying the water, the lower end of the cover 6 is located at a position where it does not hit the water to be sprayed, so that the spray does not hinder the spraying and a desired uniform spraying state can be obtained.

Next, a second embodiment will be described.
The description of the same parts as in the embodiment is omitted.

A large number of holes 21 are formed in the lower part of the cover 6 according to the second embodiment. In the second embodiment, the lower end of the cover 6 is
, But the bottom edge of the cover is in a position that does not hinder the spraying of water by the deflector in case of fire.

In the second embodiment, when a fire occurs, a hot air flow from below strikes a plurality of heat collecting plates 15 and 16 to heat these heat collecting plates. Further, the hot air flowing from the side or obliquely downward flows into the cover 6 from the many holes 21 which are inflow portions, and heats the thermosensitive decomposition portion and the low melting point alloy installation portion in the cover.

FIG. 4 shows the sprinkling state in the second embodiment, but the lower end of the cover does not hinder the sprinkling as in the first embodiment.

[0034]

As described above, the flash type sprinkler head of the present invention is not aesthetically pleasing, and impairs the interior design because the thermal decomposition part, which is an important part, is covered and protected by a cover. It has excellent aesthetics and reliability, protecting it from external impacts, and has a hot air flow inlet at the lower end of the cover, making it easier for fire hot air to flow in In addition, the cover is also excellent in the quick-moving property, in which the hot air flow is trapped inside and the heat-sensitive decomposition portion is heated quickly.

[Brief description of the drawings]

FIG. 1 is a front half sectional view of a first embodiment of the present invention.

FIG. 2 is a front sectional view of the first embodiment during operation.

FIG. 3 is a front half sectional view of a second embodiment of the present invention.

FIG. 4 is a front sectional view of the second embodiment during operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Frame 3 Valve body 4 Deflector 5 Thermosensitive decomposition part 6 Cover 14 Low melting point alloy 15, 16 Heat collecting plate 19 Inflow part 20 Gap 21 hole

Claims (3)

(57) [Claims] 1. A flash sprinkler head having a structure in which a deflector held by a thermosensitive decomposition part drops by a predetermined distance and stops when a fire occurs, a plurality of disc-shaped heat collectors are provided at a lower end of the thermosensitive decomposition part. A plate is installed, the thermal decomposition part is surrounded by a cover attached to the frame, and an inflow part where hot air flow can flow into the inside of the cover is formed at the bottom of the cover, and the lower end of the cover is a deflector A flush-type sprinkler head, which is located above a deflector that has fallen so as not to hinder the spraying of water. 2. The flash sprinkler head according to claim 1, wherein the inflow portion is a gap formed between the cover and the heat collecting plate. 3. The flash sprinkler head according to claim 1, wherein the inflow portion includes a plurality of holes formed in a lower portion of the cover.