JP2000140149A - Flash-type sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of a thermally-sensitive decomposing part and the other constituting parts due to an external shock by insert-holding an annular elastic member between a part constituting the thermally sensitive decomposing part and the lower end of a frame in a structure where a deflector is held at the thermally-sensitive decomposing part engaged with the frame. SOLUTION: This flash-type sprinkler head does not affect a valve 2 and the valve seat of a nozzle 11 by making the valve 2 move upward when external shock is imposed and the thermally-sensitive decomposing part 5 is moved upward. The part 5 is formed of a cylinder 51, a low melting point alloy 52, a plunger 53, an upper holder 54, a lower holder 55, a plate spring 56, a coned disc spring 57, etc. The upper holder 54 can slide inside of an inner flange 32 and the lower holder 55 can slide on the inner wall of the flange 32. Then, an annular groove 63 is cut-formed at the upper part of the external edge of the lower holder 55 to insert-hold an annular elastic member 6 between the lower end of the frame 3 and the groove 63 of the lower holder 55.

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, particularly a deflector housed in a frame in normal times, and when a fire occurs, the deflector slides down to the lower portion of the frame and water spouts from a nozzle. The present invention relates to a flash type sprinkler head which is dispersed and dispersed by a deflector which has stopped falling.

[0002]

2. Description of the Related Art Types of sprinkler heads include:
There are a frame / yoke type sprinkler head, a multi type sprinkler head, a flash type sprinkler head and the like. In these sprinkler heads, the heat of a fire causes the low-melting-point alloy placed in the heat-sensitive decomposition portion to melt, thereby breaking the balance of the heat-sensitive decomposition portion and decomposing the heat-sensitive decomposition portion. Then, the valve body held in the thermal decomposition part is detached from the nozzle and the nozzle is opened to blow out water to extinguish the fire. Therefore, in the sprinkler head, the thermosensitive decomposition part is installed below, that is, at the lowermost end near the floor at the place where the fire occurs, so as to easily touch the heat of the fire.

By the way, in a building with a low ceiling on a high floor as recently, when a long object is walked in a room to which a sprinkler head is attached, or when a child throws a toy and plays, a long object is lost. In some cases, the toy was hit by a thermal decomposition part of the sprinkler head, and the thermal decomposition part was destroyed or deformed in some cases.
If the thermosensitive decomposition part is destroyed, the valve body closing the nozzle will come off completely and spray water, causing an explosive accident,
Further, if the components are deformed or displaced even if the thermally decomposed portion is not destroyed, the sealing of the valve body is deteriorated and water leakage occurs.

The most likely to encounter this external impact is a frame-yoke type sprinkler head which projects greatly from the ceiling surface, and then a multi-type sprinkler head entirely mounted on the ceiling surface.

The flash type sprinkler head is also referred to as an embedded type sprinkler head, and most of the sprinkler head is mounted by being embedded in the ceiling, but only the thermal decomposition portion must be projected from the ceiling surface. This is because the heat of the fire flows along the ceiling surface, and the thermal decomposition part of the sprinkler head senses and decomposes the hot air of the flowing fire. In other words, even in the flash sprinkler head, in order to expose the heat-decomposed portion to the hot air flowing along the ceiling surface, the heat-decomposition portion must be slightly protruded from the ceiling surface.

In a high ceiling building a long time ago, a flash type sprinkler head with very little projection from the ceiling surface had almost no problem with external impact. External shocks have been encountered even with protruding flush sprinkler heads. Therefore, as a countermeasure, the balancer that constitutes the thermal decomposition part is made to have an outer diameter larger than the inner diameter of the inner protruding edge of the frame to protect the thermal decomposition part by preventing the balancer from sinking inward even when subjected to an external impact. A flash sprinkler head has been proposed in Japanese Patent Application Laid-Open No. Hei 10-179789.

[0007]

A conventional flash sprinkler head having a structure for protecting a pyrolyzed portion,
Since a metal frame is also provided with a metal balancer, that is, a rigid body is in contact with a rigid body, when an external impact is applied to the balancer part, the impact directly contacts the balancer. There is a risk that these may be transmitted to the frame or other parts of the thermosensitive decomposition part and deformed. If the parts or the frame of the heat-sensitive decomposition part are deformed, there arises a problem that the heat-sensitive decomposition part does not decompose when a fire occurs or that the heat-sensitive decomposition part is slowed down.

[0008] In the flash type sprinkler head, stainless steel having excellent corrosion resistance and mechanical strength is used as a material of a component constituting the thermal decomposition portion. However, stainless steel certainly has corrosion resistance in a general corrosive atmosphere, but causes intergranular corrosion in a chlorine atmosphere, resulting in so-called “stress corrosion cracking”. In other words, when the flash type sprinkler head is installed in an indoor pool with strong chlorine or a kitchen of a cafeteria using chlorine-disinfected tap water, the stainless steel part of the thermal decomposition part will cause stress corrosion cracking over the years, Decomposed and caused explosion.

According to the present invention, even if an external impact is applied to the heat-sensitive decomposition part, the heat-sensitive decomposition part and other components are not deformed. It is an object of the present invention to provide a flash-type sprinkler head in which stainless steel parts do not cause stress corrosion cracking.

[0010]

SUMMARY OF THE INVENTION The present inventor has determined that, even if an external impact is applied to a portion constituting the outside of the thermal decomposition part, if the impact of the part is not directly transmitted to the frame or other parts, the frame or the other parts may be damaged. The present invention focuses on the fact that the thermosensitive decomposition part does not deform or break, and that the elastic material has airtightness, so that if the stainless steel part is isolated, it will not be exposed to the chlorine atmosphere, etc. Completed.

According to the present invention, there is provided a flash sprinkler head having a structure in which a deflector is housed in a frame and the deflector is held by a pyrolysis portion engaged with the frame. A flash-type sprinkler head having an annular elastic member sandwiched therebetween, and a structure in which a deflector is housed inside a frame and the deflector is held by a thermosensitive decomposition portion engaged with the frame. In the flush-type sprinkler head of (1), an annular elastic member is sandwiched between a component constituting a thermosensitive decomposition portion and a lower end of the frame, and a valve body is installed so as to be movable in the nozzle. Flash type sprinkler head.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The elastic member used in the present invention is as follows.
Rubber, synthetic resin, metal, etc.
O-ring, U-ring in FIG. 4, and dish spring in FIG. 5 can be exemplified.

According to the present invention, an annular groove is formed in one of the parts and the frame outside the thermal decomposition part, and an elastic member is fitted into the groove and the other member is inserted into the groove. By doing so, destruction and deformation of the thermosensitive decomposition portion can be further prevented. For example, when a groove is engraved on the outer part of the thermal decomposition part, an elastic body is fitted in the groove, and a frame is inserted into the groove, the side wall of the frame and the inner wall of the groove come into contact with each other, When an external impact is applied to the thermal decomposition part from the side, the inner wall of the groove formed in the thermal decomposition part hits the side wall of the frame, and the thermal decomposition part does not move any more.

When the valve element of the flash type sprinkler head can move upward, when an external impact is applied and the thermosensitive decomposition part moves slightly upward,
The valve body also moves upward and does not affect the valve body or the valve seat of the nozzle.

The elastic member used in the present invention is, as shown in FIG. 4, an O-ring (a) having a round cross section, a U-ring (b) having a U-shaped cross section, and a washer spring (c) having a cross section inclined to one side. And so on.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flash sprinkler head according to the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a flash sprinkler head of the present invention, FIG. 2 is a front sectional view of the flash sprinkler head of the present invention when a shock is applied from below, and FIG. 3 is a view of the flash sprinkler head of the present invention. It is front sectional drawing of the state which operated.

The flash-type sprinkler head shown in the embodiment has a structure in which a leaf spring, which is a component of the thermal decomposition part, engages with the frame.

The flush type sprinkler head of the present invention comprises a main body 1, a valve body 2, a frame 3, a deflector 4,
It is composed of a thermosensitive decomposition part 5, an elastic member 6, and the like.

The main body 1 has a nozzle 11 at the center. An external thread 12 for attaching to a pipe (not shown) is screwed outside the main body 1, and an engagement projection 13 for engaging a tool when attaching the sprinkler head to the pipe is provided below the external thread 12. Are formed, and a male screw 14 screwed with the frame 3 is provided below the engagement protrusion.
Is screwed.

The valve body 2 has a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the nozzle 11, and has an annular groove 21
Is engraved. An O-ring 22 is fitted in the groove so as to be in close contact with the inside of the nozzle 11 so as to maintain a watertight state. A flange 23 is formed on the lower surface of the valve body 2.
The valve body 2 is separated and does not prevent the valve body 2 from slightly moving upward. On the lower surface of the valve body 2, a projection 2 having a spherical tip is provided.
4 are formed.

The frame 3 has a cylindrical shape, and a female screw 31 screwed with the male screw 14 of the main body 1 is screwed in an upper portion on the inner side. Further, an inner flange 32 is formed at an inner lower portion.

The deflector 4 has a disk shape having a large number of blades, and has a plurality of hanging legs 41 extending upward. The upper portion of the suspension leg is fixed to a washer-shaped ring 42, and a helical spring 43 is installed on the ring in a compressed state. Ring 42 is frame 3
Is slightly smaller than the inner diameter of the frame 3 and is larger than the inner flange 32 of the frame 3. A hole is formed in the center of the deflector 4, and the projection 24 of the valve body is fitted into the hole, so that the deflector 4 and the valve body 2 are integrated.

The thermal decomposition part 5 is composed of a cylinder 51, a low melting point alloy 52, a plunger 53, an upper holder 54, a lower holder 55, a leaf spring 56, a disc spring 57 and the like. The cylinder 51 has a bottomed cylindrical shape, and is filled with a low melting point alloy 52 for about seven to eight minutes, and a hole is formed in the center of the low melting point alloy 52 and the cylinder 51. The plunger 53 includes a disk portion 58 having a smaller diameter than the inner diameter of the cylinder 51 and a shaft portion 59.
Reference numeral 9 protrudes from the center of the disk portion 58, and a male screw 60 is screwed on the upper portion. Shaft portion 59 of plunger 53
Is inserted through the hole of the cylinder 51 and the low melting point alloy 52,
A male screw 60 is screwed with a female screw 61 of the upper holder 54.

The outside of the upper holder 54 is the frame 3
The inner flange 32 can slide inside the inner flange 32 with a diameter slightly smaller than the inner diameter of the inner flange 32. The lower holder 55 has a substantially inverted trapezoidal cross section, a recess 62 formed in the upper part, and the outer wall thereof is slidable on the inner wall of the inner flange 32.

The outer diameter of the upper portion of the lower holder 55 is larger than the outer diameter of the frame 3, and an annular groove 63 into which the lower end of the frame 3 can be easily inserted is formed in the upper portion of the outer edge. . An annular elastic member 7 is sandwiched between the lower end of the frame 3 and the groove 63 of the lower holder 55.

The leaf spring 56 has a hole 64 formed in the center as shown in FIG. 5, and a plurality of engaging pieces 66... Is an engagement edge 67 slightly bent outward. At the time of no load indicated by a solid line, the engagement piece 68 of the leaf spring 56 is, as shown in FIG. And the diameter of a circle formed by connecting the tips of the engagement edges when no load is applied (hereinafter referred to as the diameter of the engagement piece) is equal to or less than the inner diameter of the inner flange 32 of the frame 3. . The leaf spring 56 is sandwiched between the lower peripheral edge of the upper holder 54 and the upper peripheral edge of the lower holder 55, and when a load is applied against the bias of the spring, the diameter of the engagement piece is changed to the inner flange 32 of the frame 3. The inner diameter is larger than the inner diameter. That is, when a load is applied, the engaging edge 67 of the leaf spring projects from the periphery of the lower holder 55 as shown in FIG. 1, and the projected engaging edge engages with the upper portion of the inner flange 32 of the frame 3. The shaft 59 of the plunger 53 is located at the center of the leaf spring 56.
A hole 64 through which the hole can be easily inserted is formed.

In the flash sprinkler head of the present invention having the above-described structure, the leaf spring is made of stainless steel, and the inside of the thermal decomposition part where the leaf spring is installed is provided between the lower holder 55 and the frame 3 by the elastic member 7. Is installed to make it airtight, so that external gas does not enter the interior of the thermosensitive decomposition part. Therefore, even when the flash type sprinkler head of the present invention is installed in an indoor pool or a restaurant kitchen having a strong chlorine atmosphere, chlorine ions do not enter the inside of the thermosensitive decomposition portion, and the stainless steel leaf spring installed inside is not affected. No intergranular corrosion.

Next, the state of the flash sprinkler head of the present invention having the above-described structure when an external impact is applied from below the thermosensitive decomposition portion will be described.

When an external impact (arrow G) is applied to the flash type sprinkler head attached to a pipe (not shown) in the ceiling from below, the lower holder at the outermost of the components of the thermal decomposition part as shown in FIG. 55 is lifted upward. Then, since the elastic member 7 is provided between the lower holder 55 and the frame 3, the elastic member is compressed and deformed by the impact from the lower holder, so that the impact is absorbed and the impact is not directly transmitted to the frame 3. become. At this time, the entire thermal decomposition part slightly moves upward. With this slight movement, the valve body 2 enters the nozzle 11 and the engaging edge 67 of the leaf spring 56 moves on the inner flange 32 of the frame 3. Is slightly moved upward. Further, the valve body held by the thermosensitive decomposition part also moves slightly upward. After the impact disappears, the elastic member 7 returns to its original shape due to its own elasticity, and the valve body 2 and the leaf spring 56 also return to their original positions.

The operation of the flash sprinkler head having the above-described structure will now be described.

When a fire occurs, a hot air flow rises from the source of the fire, reaches the ceiling surface, and flows along the ceiling surface. When this hot air stream reaches the flash type sprinkler head in which only the thermosensitive portion protrudes from the ceiling surface, the hot air stream heats the low melting point alloy to melt the low melting point alloy as shown in FIG. In normal times, the spring force of the leaf spring 56 is
3 is lifted upward, and the force is applied to the low melting point alloy via the disk portion 58 of the plunger 53. Therefore, the molten low melting point alloy 52 is brought into contact with the disk portion 58 of the plunger. It flows out of the gap of the cylinder 51 to the outside. Then, the leaf spring 56 has its original shape, that is, the diameter of the engagement piece is smaller than that under load, and the engagement edge 67 is
From the inner flange 32. Always, upper holder 54
Is applied with a downward spring force of the helical spring 43 via the deflector 4, so that the thermosensitive decomposition portion falls downward as the deflector 4 falls. Then, the deflector 4 falls along the inner wall of the frame 3, but the ring 42 suspending the deflector 4 is hooked on the inner flange 32 of the frame, and stops falling halfway. When the deflector 4 falls, the valve body 2 integrated with the deflector 4 also falls, opening the nozzle 11 and discharging a large amount of water from the nozzle. The water discharged from the nozzle is dispersed in all directions by a deflector that stops falling on the way, so that efficient fire extinguishing can be performed.

[0032]

As described above, the flash sprinkler head of the present invention has the elastic member sandwiched between the frame and the outermost part constituting the thermal decomposition part.
Even if an external impact is applied to the thermosensitive decomposition part, the impact resistance is not absorbed and the frame and other components are not deformed or destroyed by the elastic member. Since the inside of the decomposition part can be made airtight with an elastic member, even if the flash type sprinkler head is installed in a room with a strong chlorine atmosphere, chlorine ions do not enter the inside of the thermosensitive decomposition part and it is used for the thermosensitive decomposition part It is also highly reliable in that it does not cause intergranular corrosion of stainless steel parts for a long period of time.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a flash sprinkler head according to the present invention.

FIG. 2 is a front sectional view of the same when an external impact is applied from below.

FIG. 3 is a front sectional view illustrating an operation state;

FIG. 4 is a perspective sectional view of an elastic member.

FIG. 5 is a perspective view of a leaf spring.

FIG. 6 is a front sectional view of a leaf spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Valve body 3 Frame 4 Deflector 5 Thermosensitive decomposition part 6 Elastic member

Claims (4)

[Claims] 1. A flash sprinkler head having a structure in which a deflector is housed inside a frame and the deflector is held by a pyrolysis portion engaged with the frame, wherein a deflector is disposed between a component constituting the pyrolysis portion and a lower end of the frame. A flash type sprinkler head characterized in that an annular elastic member is sandwiched between the sprinkler heads. 2. A flash sprinkler head having a structure in which a deflector is housed in a frame and the deflector is held by a pyrolysis portion engaged with the frame, wherein a portion between the pyrolysis portion and a lower end of the frame is disposed. A flash type sprinkler head characterized in that an annular elastic member is sandwiched therebetween and a valve body is installed movably in the nozzle. 3. The flash sprinkler head according to claim 1, wherein the annular elastic member is one of an O-ring, a U-ring, and a disc spring. 4. The flash according to claim 1, wherein an annular groove is formed in a part or a frame of the thermal decomposition part which sandwiches the annular elastic member so that the elastic member can be fitted therein. Type sprinkler head.