JP2011240117A - Sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sprinkler head whose sensitivity performance is improved while securing the necessary operation-stroke amount for operating a heat-sensitive decomposition part incorporated in the sprinkler head.SOLUTION: An alloy having a low melting point is contained in a bottomed cylinder arranged within the heat-sensitive decomposition part that decomposes by the heat of a fire. The low melting-point alloy and a plunger are disposed within the cylinder, while a part of heat collector of a thin-plate shape being inserted into the cylinder through a hole opened in the cylinder bottom.

Description

The present invention relates to a fire extinguishing sprinkler head.

As a conventional sprinkler head, for example, there is a flash-type sprinkler head described in Patent Document 1. The flash-type sprinkler head is installed in a state where most of the sprinkler head is embedded in the ceiling by installing the water supply pipe and the nozzle portion of the sprinkler head connected to the water supply pipe on the back of the ceiling. As a result, the amount of the sprinkler head protruding from the ceiling is small, so it does not impair the aesthetics of the room and is excellent in design, and is installed in buildings for various uses such as office buildings, shopping centers, and apartment houses. .

JP-A-7-284545

In recent years, there is an increasing demand for sprinkler heads that have improved fire detection capability in the above-described sprinkler heads. By improving the fire detection capability of the sprinkler head, it is possible to operate the sprinkler head at an early stage from the occurrence of a fire and spray water to perform initial fire fighting.

As a means for improving the fire detection capability of the sprinkler head, it is conceivable to reduce the amount of low melting point alloy installed in the sprinkler head.

The low melting point alloy is incorporated in the thermal decomposition part, and when the low melting point alloy melts, the components of the thermal decomposition part are displaced to constitute the operating stroke. In order to secure a stroke amount (displacement amount), there is a limit in reducing the height dimension of the low melting point alloy.

Therefore, in view of the above problems, an object of the present invention is to provide a sprinkler head that secures an operation stroke amount necessary for operation of a thermal decomposition section and improves sensitivity performance.

(1) The sprinkler head of the present invention normally supports a valve body that closes the nozzle, and a low melting point alloy is contained in a bottomed cylindrical cylinder disposed in a thermal decomposition part that is decomposed by the heat of fire. A plunger that presses the low melting point alloy toward the bottom of the cylinder is in contact with the surface of the low melting point alloy, and a part of the thin plate heat collector is inserted into the cylinder through a hole drilled in the bottom of the cylinder. In this state, a low melting point alloy and a plunger are provided in the cylinder.

As a result, the low melting point alloy and the heat collector can be in direct contact with each other, and heat can be directly transferred from the heat collector to the low melting point alloy. Conventionally, heat is transferred from the heat collector to the low melting point alloy through the cylinder, so that the heat transfer loss can be further reduced by the present invention.

In the present invention, the time from the occurrence of a fire to the operation of the sprinkler head can be shortened by reducing the heat transfer loss from the heat collector to the low melting point alloy without reducing the amount of the low melting point alloy.

(2) The sprinkler head of the present invention includes a cylindrical cylinder disposed in a heat-sensitive decomposition section that normally supports a valve body that closes the nozzle and is decomposed by the heat of a fire, and a piston that can be inserted into the cylinder. Joined by a low melting point alloy, the piston is pressed in the direction from the cylinder opening to the bottom, and a space is provided between the piston and the bottom of the cylinder so that the piston can move in the direction from the cylinder opening to the bottom. It is what.

By joining the cylinder and the piston with a low melting point alloy, a fillet is formed at the edge of the low melting point alloy. Since the fillet extends to the end face of the cylinder or piston, the cylinder and the piston are three-dimensionally joined to increase the joining strength. As a result, it is possible to configure the thermal decomposition part with a small amount of low melting point alloy compared to the conventional product, and the low melting point alloy can be melted and the sprinkler head can be operated at an early stage from the occurrence of a fire.

In the above invention, when the low melting point alloy is melted, the heat-sensitive decomposition part can be decomposed by providing a space in the moving direction of the piston so that the piston can move in the direction from the opening of the cylinder toward the bottom surface. . That is, it can be realized by setting the movement amount of the piston as a stroke amount necessary for the operation of the thermal decomposition unit and providing a space capable of securing the stroke amount.

(3) About the sprinkler head of this invention, the heat collector inserted in the cylinder can be arrange | positioned along the bottom face of a cylinder.
By arranging the heat collector inserted into the cylinder along the bottom of the cylinder, when the low melting point alloy melts in the event of a fire, the heat collector in the cylinder is located away from the plunger or piston. Or, the movement of the piston toward the bottom side of the cylinder is not hindered. Further, since the molten low melting point alloy flows through the side surface of the plunger or piston to the opening side of the cylinder, the heat collector disposed along the bottom surface of the cylinder does not hinder the flow of the molten low melting point alloy.

(4) About the sprinkler head of this invention, the heat collector inserted in the cylinder can be arrange | positioned along the surrounding surface of a cylinder.
By arranging the heat collector inserted into the cylinder along the peripheral surface of the cylinder, the heat collector is disposed between the outer peripheral surface of the plunger or the piston and the inner peripheral surface of the cylinder. By installing several heat collectors between the outer peripheral surface of the plunger or piston and the inner peripheral surface of the cylinder, a gap is generated between each heat collector inserted into the cylinder. When a low melting point alloy melts in the event of a fire, the heat collector in the cylinder is located at a position along the outer peripheral surface of the plunger or piston, which hinders the movement of the plunger or piston to the bottom side of the cylinder. There is nothing. Further, the molten low melting point alloy flows through the gaps between the heat collectors arranged on the outer surface of the plunger or piston and flows to the opening side of the cylinder, so that the heat collector arranged along the circumferential surface of the cylinder Does not interfere with the flow of the molten low melting point alloy.

(5) About the sprinkler head of this invention, the recessed part which can accommodate the heat collector arrange | positioned in a cylinder can be formed in a cylinder.
Since the heat collector placed in the cylinder is housed in the recess, the low melting point alloy can contact the bottom surface and inner peripheral surface of the cylinder without any gaps, and heat transfer loss transmitted from the outer surface of the cylinder or the heat collector to the low melting point alloy is reduced. Can be reduced. Further, when the low melting point alloy is melted, the movement of the plunger or piston in the cylinder and the flow of the molten low melting point alloy are not hindered.

(6) In the sprinkler head of the present invention, the inner peripheral surface of the hole drilled in the bottom surface of the cylinder and the outer peripheral surface of the piston can be joined by a low melting point alloy.
According to this, since the low melting point alloy can be arranged at a position closer to the fire source, the low melting point alloy can be melted and the sprinkler head can be operated at an early stage from the occurrence of a fire.

(7) In the sprinkler head of the present invention, the inner peripheral surface of the cylinder and the outer peripheral surface of the piston can be joined by a low melting point alloy via a heat collector.
According to this, the heat collected by the heat collector is directly transmitted to the low-melting point alloy, and the low-melting point alloy is melted at an early stage from the occurrence of the fire, so that the sprinkler head can be operated.

According to the present invention, the sprinkler head that secures the operation stroke amount necessary for the operation of the thermal decomposition section and has improved sensitivity performance enables the sprinkler to operate and extinguish fire earlier than the conventional product. .

Sectional drawing of the sprinkler head of 1st Embodiment FIG. 1 is a cross-sectional view of the main part and a modification thereof. Main part sectional drawing of 2nd Embodiment Modified example of the second embodiment Sectional drawing of the principal part of 3rd Embodiment Exploded sectional view of essential parts of the third embodiment Sectional drawing of the principal part of 4th Embodiment

1st Embodiment (FIGS. 1-2)

Since the structure of the sprinkler head according to the first embodiment is already known in Japanese Patent Laid-Open No. 7-284545, Japanese Utility Model Laid-Open No. 5-11963, etc., a detailed description of portions that do not have much relation to the present invention is omitted. .

The sprinkler head SH shown in FIG. 1 is a flash type, and is composed of a main body 1, a frame 2, a valve body 3, a deflector 4, a thermal decomposition portion 5, a heat collector 6, and the like.

The main body 1 has a water guide hole 7 formed in the center, a lower end thereof serves as a valve seat 8, a male screw 9 is screwed on an outer peripheral upper portion, and a flange 10 is formed on the lower end.

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

The valve body 3 closes the valve seat 8 of the main body 1 during normal times.

The deflector 4 is dish-shaped and has a large number of blades around it. A ring 12 is placed on the blades, and is suspended by the ring 12 during operation. The deflector 4 is installed below the valve body 3.

The thermal decomposition portion 5 is installed at the lower part of the frame 2 and holds the valve element 3 via the guide post 13.

Here, the thermal decomposition portion will be described in detail. The pair of levers 14, 14 whose upper portions are bent outward are engaged with the inner flange 11 of the frame 2 at the lower ends of the bent portions. A support plate 15 is engaged with the lever on the upper side, and a balance 16 is engaged with the lower side.

A set screw 17 having a hemispherical lower end is screwed to the support plate 15, a cylinder 23 is inserted into the balance 16, and a flange 22 of the cylinder 23 is engaged with a hole 21 of the balance 16. .

The cylinder 23 has a bottomed cylindrical shape, and a plurality of holes 24 are formed at the bottom. A thin plate-like heat collector 6 is installed on the bottom side of the cylinder. A protrusion 25 that can be fitted into a plurality of holes 24 is formed at the center of the heat collector 6. When the protrusion 25 is inserted into the hole 24, the flat surface of the heat collector 6 contacts the bottom surface of the cylinder 23. Further, the outer surface of the protrusion 25 is in contact with the inner peripheral surface of the cylinder 23. The protrusions 25 inserted through the holes 24 are installed in the cylinder 23 with an interval. A gap 25A is formed between the protrusions 25 through which the low melting point alloy 28 melted in the event of a fire can flow.

A low melting point alloy 28 is inserted into the cylinder 23. The low melting point alloy 28 is in contact with the inside of the protrusion 25. Furthermore, a plunger 29 is placed on the low melting point alloy 28. An inverted conical groove 30 is formed on the upper portion of the plunger 29, and the lower end portion of the set screw 17 is placed in the groove.

At this time, the tip of the protrusion 25 is configured to protrude from the upper surface of the plunger 29. As a result, it is possible to prevent the low melting point alloy 28 from being melted by the heat of the fire and causing the tip of the protrusion 25 and the plunger 29 to be caught by being caught when the plunger 29 moves to the bottom surface side of the cylinder 23.

As a modification of the first embodiment, as shown in FIG. 2A, the protrusion 25 can be bent to the bottom surface side of the cylinder 23. Further, as shown in FIG. 2B, a bowl-shaped cover 26 can be sandwiched between the heat collector 6 and the bottom surface of the cylinder 23.

If the cylinder 23, the heat collector 6, the cover 26, etc. are made of a copper alloy such as brass or bronze having good heat conduction, the heat of the fire collected by the heat collector 6 or the cover 26 causes a transmission loss to the low melting point alloy 28. It can be propagated in a small state.

Next, the operation of the sprinkler head of the first embodiment will be described.

When a fire breaks out, the heat from the fire reaches the ceiling and heats the sprinkler head attached to the ceiling. In the sprinkler head SH, the heat collector 6 and the cover 26 are installed in the lower part near the fire source, and the surface area is large, so that the heat of the airflow is received. Further, since the heat collector 6 and the cover 26 are directly attached to the cylinder 23, and the projection 25 of the heat collector 6 is in direct contact with the low melting point alloy 28, the heat received by the heat collector 6 and the cover 26 is immediately 23 and the low melting point alloy 28, and the heat quickly melts the low melting point alloy 28 in the cylinder 23.

In the sprinkler head SH, the force that presses the valve body 3 is applied to the plunger 29 via the pair of levers 14 and 14, the support plate 15, and the set screw 17 constituting the thermal decomposition portion 5. When the melted low melting point alloy 28 is melted, the melted low melting point alloy 28 flows to the opening side of the cylinder 23 through the gap between the outer peripheral portion of the plunger 29 and the inner peripheral portion of the cylinder 23, and the plunger 29 is moved. Immerse in the cylinder 23. Then, the pair of levers 14, 14 that were locked by the balance 16 was unlocked, and the lower part of each lever 14 was rotated outward to engage the inner flange 11 of the frame 2. The bent end of the lever is released, the thermal decomposition portion 5 is disassembled, and all the components fall downward.

As the thermal decomposition portion 5 is disassembled and dropped, the guide post 13 held at the bent top portion of the lever 14 falls, and the valve body 3 integrated with the deflector 4 and the ring 12 held by the deflector 4 also fall. However, since the deflector 4 is suspended from the ring 12 and the ring 12 is locked by the inner flange 11 of the frame 2, the deflector 4 is locked when the ring 12 is locked by the inner flange 11. The fall stops on the way.

Since the valve body 3 falls and opens the valve seat 8, water sent through a pipe (not shown) is ejected from the water introduction hole 7. The jetted water hits the deflector 4 stopped on the way and is sprayed in all directions, and is put on a flame to extinguish the fire.

Second Embodiment (FIGS. 3 to 4)

The structure of the sprinkler head according to the second embodiment is substantially the same as that of the sprinkler head according to the first embodiment.

In the thermal decomposition section shown in FIG. 3A, the cylinder 31 has a cylindrical shape, and the upper end side engages with the hole 21 of the balance 16 as in the first embodiment. A piston 32 having an outer diameter smaller than the inner diameter of the cylinder 31 is inserted through the lower end side. The lower part of the piston 32 is inserted into a hole 31A drilled in the bottom surface of the cylinder 31, and the inner peripheral part of the hole 31A of the cylinder 31 and the lower part of the piston 32 are joined by a low melting point alloy 28.

A fillet F is formed at the edge of the low melting point alloy 28. The fillet F extends to the end face of the hole 31 </ b> A of the cylinder 31, and the cylinder 31 and the piston 32 are joined in three dimensions. The fillet F can increase the joining strength.

A flange 32A is formed on the lower end side of the piston 32, and a plate-shaped heat collector 33 can be sandwiched between the flange 32A and the lower end of the cylinder 31.

The piston 32 is pressed downward in the figure by a plunger 34 inserted into the cylinder 31 from the upper end side of the cylinder 31.

A space 35 is provided between the bottom surface of the cylinder 31 and the lower end surface of the piston 32. The space 35 secures an operation stroke necessary for the thermal decomposition unit 5 to perform the decomposition operation. Specifically, the plunger 34 moves to the bottom surface side of the cylinder 31 when the thermal decomposition unit 5 is decomposed. Then, by disengaging the balance 16 and the lever 14, the thermal decomposition unit 5 is disassembled and disassembles.

As a modification of the second embodiment according to the above, FIG. 3B shows a case where a space 35 is provided near the bottom surface of the cylinder 31 and a joining portion between the cylinder 31 and the piston 32 is provided above the space 35. Thereby, since the area where the cylinder 31 and the piston 32 are joined by the low melting point alloy 28 is larger than that in the embodiment of FIG. 3A, the joining strength can be improved. FIG. 2C shows a configuration in which a step portion is formed at a joint portion between the cylinder 31 and the piston 32. As a result, the inner peripheral surface of the hole 31A of the cylinder 31 and the outer peripheral surface of the piston 32 are joined by the low melting point alloy 28, and the bottom outer surface of the cylinder 31 and the plane of the flange 32A of the piston 32 on the cylinder 31 side are low melting point alloy 28. Since the area joined by the low melting point alloy 28 is larger than that of the embodiment of FIG. 3A, the joining strength can be improved.

Further, as shown in FIG. 4, it is also possible to join with the low melting point alloy 28 with the heat collector 36 inserted between the joining portions of the cylinder 31 and the piston 32. At that time, it is also possible to form a plurality of notches 36B in the cylindrical portion 36A of the heat collector 36 inserted between the joining portions of the cylinder 31 and the piston 32. As a result, the heat collected by the heat collector 36 is directly transmitted to the low melting point alloy 28, so that the low melting point alloy 28 is melted and the sprinkler head can be operated at an early stage from the occurrence of a fire.

Next, the operation of the sprinkler head of the second embodiment will be described.

Since the operation from the occurrence of a fire to the melting of the low melting point alloy 28 is the same as that of the first embodiment, the description thereof is omitted. When the low melting point alloy 28 melts, the joined state of the cylinder 31 and the piston 32 joined by the low melting point alloy 28 is released, and the piston 32 is pressed to the bottom side of the cylinder 31 from the set screw 17 to the bottom side of the cylinder 31. Move to. Then, the pair of levers 14, 14 that were locked by the balance 16 was unlocked, and the lower part of each lever 14 was rotated outward to engage the inner flange 11 of the frame 2. The bent end of the lever is released, the thermal decomposition portion 5 is disassembled, and all the components fall downward. Since the operation of the thermal decomposition portion 5 after the decomposition and dropping is the same as that of the first embodiment, the description thereof is omitted.

Third Embodiment (FIGS. 5 and 6)

The structure of the sprinkler head according to the third embodiment is substantially the same as that of the sprinkler head according to the first embodiment.

In the thermal decomposition part shown in FIG. 5 (a), the cylinder 41 has a bottomed cylindrical shape, and a flange 41A is formed at the opening on the upper end side. The flange 41A is formed with the hole 21 of the balance 16 as in the first embodiment. Engage. A hole 41B is formed in the bottom surface, and a cylindrical portion 42A of a heat collector 42 described later is inserted therethrough.

The heat collector 42 has a cylindrical portion 42A formed at the center, and has a slope that inclines downward in the figure toward the periphery. The cylindrical portion 42 </ b> A of the heat collector 42 is inserted through the hole 41 </ b> B of the cylinder 41 through the flat plate heat collector 43. The cylindrical portion 42A inserted through the hole 41B is bent so that the outer peripheral portion of the cylindrical portion 42A is along the bottom surface of the cylinder 41. Accordingly, the heat collectors 42 and 43 are fixedly installed on the cylinder 41.

By fixing the heat collectors 42 and 43 to the cylinder 41, the outside of the bottom surface of the cylinder 41 and the heat collector 43 are in direct contact, and the hole 41B and the inside of the bottom surface of the cylinder 41 are in direct contact with the heat collector 42. The heat collected by the heat collectors 42 and 43 can be efficiently transmitted to the cylinder 41 and the low melting point alloy 44, and the melting of the low melting point alloy 44 can be accelerated in the initial stage of a fire.

Further, as shown in FIG. 5B, a concave portion 41 </ b> C capable of accommodating the bent cylindrical portion 42 </ b> A can be provided on the bottom surface of the cylinder 41. The recess 41C allows the low melting point alloy 44 to contact the bottom surface of the cylinder 41 without any gap, and heat transmitted from the bottom surface of the cylinder 41 can be efficiently transmitted to the low melting point alloy 44. From this, the low melting point alloy 44 is melted at an early stage from the occurrence of a fire, and the sprinkler head can be operated.

An annular low-melting point alloy 44 is accommodated in the cylinder 41 in which the heat collectors 42 and 43 are installed. The low-melting-point alloy 44 may be inserted into the cylinder 41 in advance, or the molten low-melting-point alloy is poured into the cylinder 41 with the hole 41B closed, cooled, and solidified. It is also possible to form a ring by drilling.

A plunger 45 is placed on the low melting point alloy 44. The plunger 45 has a cylindrical shape and is provided with a step 45A in the middle. The outer diameter above the step 45A is slightly smaller than the inner diameter of the cylinder 41 and is accommodated in the cylinder 41. The outer diameter below the stepped portion 45A is slightly smaller than the inner peripheral diameter of the cylindrical portion 42A, and is inserted into the cylindrical portion 42A. The step portion 45 </ b> A is placed on the low melting point alloy 44 and is in contact with the low melting point alloy 44. In this state, the end on the side inserted into the cylindrical portion 42A is in a state of protruding to the outside of the cylindrical portion 42A. An inverted conical groove 30 similar to that of the first embodiment is formed on the surface of the plunger 45 opposite to the surface in contact with the low melting point alloy 44, and the lower end portion of the set screw 17 is mounted. Is placed.

Since the operation of the sprinkler head of the third embodiment is substantially the same as that of the first embodiment, the description thereof is omitted.

Fourth embodiment (FIG. 7)

In the sprinkler head of the fourth embodiment shown in FIG. 7, the configurations of the cylinder 41, the heat collectors 42 and 43, and the plunger 45 are substantially the same as those of the third embodiment. In the fourth embodiment, the lower outer peripheral portion of the step portion 45 </ b> A of the plunger 45 and the inner peripheral portion of the cylindrical portion 42 </ b> A of the heat collector 42 are joined by the low melting point alloy 46.

A space 35 similar to that of the second embodiment is provided between the step portion 45A of the plunger 45 and the bottom surface of the cylinder 41. When the low melting point alloy 46 is melted, the plunger 45 is opened to the cylinder 41. It is configured to be movable in the direction from the side toward the bottom side.

In the fourth embodiment, the cylinder 41 and the plunger 45 are joined via the cylindrical portion 42A of the heat collector 42, and in the event of a fire, the heat collected by the heat collectors 42 and 43 is efficiently converted into a low melting point alloy. 44, the melting of the low melting point alloy 44 can be accelerated in the initial stage of the fire.

Since the operation of the sprinkler head of the fourth embodiment is substantially the same as that of the second embodiment, description thereof is omitted.

The present invention described above is used for the frame yoke type sprinkler head described in (for example, JP-A-11-123250) and the multi-type sprinkler head (for example, JP-A-10-71215). Is possible. Further, the present invention can be applied to a structure using a ball (for example, JP-A-6-178825) or a structure using a ring (for example, JP-A-7-250912) as the structure of the thermal decomposition portion.

In the above-described embodiment, the sprinkler head with the cylinder opening facing upward has been described. However, the present invention is not limited to this, and the present invention can be applied to a sprinkler head with the cylinder opening facing downward or sideways.

1 body
2 frames
3 Disc
4 Deflector
5 Thermal decomposition section
6, 33, 36, 42, 43 Heat collector
14 Lever
15 Support plate
16 Balance
17 Set screw
23, 31, 41 cylinders
24 holes
25 Protrusions
26 Cover
28, 44, 46 Low melting point alloy
29, 34, 45 Plunger
32 piston
35 space

Claims (7)

A low-melting-point alloy is contained in a bottomed cylindrical cylinder placed in a thermal-sensitive decomposition part that normally supports the valve body that closes the nozzle and is decomposed by the heat of the fire. The plunger that presses the low melting point alloy toward the bottom of the cylinder is in contact, and the low melting point alloy and the plunger are in a state where a part of the thin plate heat collector is inserted into the cylinder from the hole drilled in the bottom of the cylinder. Sprinkler head characterized by being deployed in the cylinder.
The valve body that normally closes the nozzle is supported, and a cylindrical cylinder placed in the thermal decomposition section that is decomposed by the heat of the fire and a piston that can be inserted into the cylinder are joined by a low-melting-point alloy. Is pressed in the direction from the opening of the cylinder toward the bottom, and a space is provided between the piston and the bottom of the cylinder so that the piston can move in the direction from the opening to the bottom of the cylinder.
The sprinkler head according to claim 1 or 2, wherein the heat collector inserted into the cylinder is disposed along the bottom surface of the cylinder.
The sprinkler head according to claim 1 or 2, wherein the heat collector inserted into the cylinder is disposed along a peripheral surface of the cylinder.
The sprinkler head according to claim 1 or 2, wherein a recess capable of accommodating a heat collector disposed in the cylinder is formed in the cylinder.
The sprinkler head according to claim 2, wherein an inner peripheral surface of a hole drilled in a bottom surface of the cylinder and an outer peripheral surface of the piston are joined by a low melting point alloy.
The sprinkler head according to claim 2, wherein the inner peripheral surface of the cylinder and the outer peripheral surface of the piston are joined together by a low melting point alloy via a heat collector.

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