JP4386960B1 - Sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main body having a nozzle inside connected to a fire extinguishing equipment pipe, a valve body for closing an outlet of the nozzle, and a thermal sensor that keeps the valve body in a closed state during a normal time and performs a decomposition operation in a fire. In a sprinkler head composed of a heat sensitive body that is incorporated in a heat-sensitive decomposition part and is filled with a soluble alloy in a cylinder and pressing the soluble alloy by a piston, it is used as a soluble piece in the heat-sensitive body A sprinkler head capable of preventing the occurrence of creep while preventing oxidation and corrosion of a fusible alloy.
A soluble alloy has a recess into which a piston can be inserted, and oil is applied to the surface of the soluble alloy.
[Selection] Figure 1

Description

The present invention relates to a heat sensitive body of a sprinkler head for fire extinguishing.

The sprinkler head is connected to a fire extinguisher pipe that is filled with a main body that has a nozzle inside. When a fire breaks out, it automatically detects the heat of the fire and sprays water to extinguish the fire. Is what you do.

In the above sprinkler head, the part that normally holds the valve body that closes the nozzle and that is decomposed by the heat of fire in the event of a fire and opens the valve body of the sprinkler head is called a thermal decomposition part. Among the components of the thermal decomposition part, a heat-sensitive body that senses heat uses a fusible alloy with a low melting point, and the fusible alloy is placed in a cylindrical cylinder with a bottom, and can be contained in the cylinder. A piston is disposed on the surface of the molten alloy.

The thermal decomposition part supports the valve body at the position where the nozzle is closed, and further presses the aforementioned piston against the cylinder bottom side. When the piston melts into the cylinder and the piston is immersed in the cylinder, the thermal decomposition section is disassembled and the support of the valve body is released and the valve body is opened. By opening the valve body, water filled in the fire extinguishing equipment pipe is discharged from the nozzle of the main body to the outside.

There exist some which were described in patent document 1, 2 as a structural example of said heat sensitive body.

The heat-sensitive body of the sprinkler head described in Patent Document 1 has a low-melting point alloy (hereinafter referred to as a fusible alloy) placed in a bottomed cylindrical cylinder, and a plunger is placed on the fusible alloy. Yes. When the heat sensitive body is incorporated in the sprinkler head, the heat sensitive body is structured to be pressed from the upper side of the plunger toward the cylinder bottom surface, and a compressive force always acts on the fusible alloy.

The heat-sensitive body of the sprinkler head described in Patent Document 2 is arranged so that the piston penetrates the fusible piece through a donut-shaped fusible piece made of a fusible alloy inside the cylinder. There is a gap through which the soluble pieces can be eluted.

Further, the gap is filled with grease to prevent dust from entering the gap and generation of corrosion products.

JP-A-7-284545 Japanese Patent Laid-Open No. 2004-243032

The above-mentioned thermosensitive materials described in Patent Documents 1 and 2 press the soluble alloy with a cylinder and a piston (indicated by “plunger” in Patent Document 1; hereinafter unified with “piston”) during normal times. Therefore, a load is always applied to the fusible alloy. The metal material used as the fusible alloy is a material having a lower strength than a copper alloy or the like used as a sprinkler head component.

When the piston inserted into the cylinder is tilted and inserted into the cylinder, a load is applied to the fusible alloy in an uneven manner. Since the fusible alloy is constantly pressed by the piston, creep occurs in the part where the unbalanced load is applied, the piston sinks, the load that closes the nozzle is reduced, and it is not a fire, but water leaks from the nozzle. May occur.

A fusible alloy is an alloy composed of a plurality of metals, and its melting point changes depending on the blending ratio of metal components, oxidation / corrosion, and the like. The melting point of the fusible alloy may change due to oxidation / corrosion of the surface part (the part that comes into contact with the outside air), that is, the operating temperature of the sprinkler head may change. May operate at different temperatures.

Therefore, in the present invention, in view of the above problems, the first object is to suppress the generation of creep of a fusible alloy of a heat sensitive body used in a sprinkler head. A second object is to prevent oxidation and corrosion of the soluble alloy.

The gap between the cylinder and the piston needs to have an interval that can be eluted to the outside when the soluble alloy is melted. However, if the gap is too large, the piston may tilt and be inserted into the cylinder. Therefore, the gap between the cylinder and the piston can be made as small as possible by filling the gap with a soluble alloy. By forming a recessed portion into which the piston can be inserted in the fusible alloy in the cylinder, and inserting the piston into the recessed portion, the piston can be inserted into the cylinder without tilting. The fusible alloy between the cylinder inner peripheral surface and the piston outer peripheral surface is melted by the heat of the fire in the same manner as the fusible alloy near the bottom of the cylinder, so it does not hinder the discharge of the molten fusible alloy in the cylinder in the event of a fire. .

The present invention is connected to a fire extinguishing equipment piping, and has a main body having a nozzle inside, a valve body that closes the outlet of the nozzle, and a heat-sensitive element that keeps the valve body closed in a normal state and operates in a decomposed manner in the event of a fire. A sprinkler head having a decomposition part, incorporated in the thermal decomposition part, in which a soluble alloy is put in a cylinder, and having a heat sensitive body pressing the soluble alloy by a piston, A sprinkler head characterized in that a recess into which a piston can be inserted is formed.

By forming a recess into which the piston can be inserted into the fusible alloy in the cylinder, and inserting the piston into the recess, the space between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston is filled with the fusible alloy. There is very little clearance between the inner peripheral surface of the piston and the outer peripheral surface of the piston. If the inner diameter of the dent is slightly larger than the outer diameter of the piston, it cannot be inserted into the dent when the piston is tilted. The

Also, the piston is better in a fully inserted state than in a partially inserted state in the recess. Furthermore, the piston may be press-fitted into the recess, or the side of the piston may be tapered so that the diameter on the side contacting the fusible alloy is reduced, and the shape of the insertion side of the recess can be the same. It is.

Since the gap between the inner peripheral surface of the recess and the outer peripheral surface of the piston is reduced, it is possible to prevent dust from entering the gap and adhesion of corrosion products. However, since even a very small gap exists, it cannot be said that no corrosion product is generated in the gap. Therefore, by applying oil to the inner surface of the recess of the soluble alloy or to the place exposed to the outside air, the soluble alloy Oxidation and corrosion can be prevented.

If oil is applied to the entire surface of the fusible alloy in the cylinder before the piston is inserted, the surface of the fusible alloy is covered with oil even if the cylinder before the piston is stored for a long period of time. Corrosion can be prevented. The oil may be applied after inserting the piston into the cylinder, that is, in the state of a heat sensitive body. The oil is applied to the entire heat sensitive body by spraying the oil on the heat sensitive body or by dipping in the oil, thereby improving the work efficiency.

Also, even if oil is not applied to the entire inner surface of the recess of the soluble alloy, the oil is applied to the piston surface or the boundary between the piston and the recess in the heat sensitive body in which the piston is inserted into the recess. As a result, the oil penetrates into a very small gap between the piston and the recess by capillary action. In addition, by applying oil to a portion of the heat sensitive body in which the piston is inserted into the recess, the soluble alloy is exposed to the outside air, oxidation and corrosion of the soluble alloy in the portion can be prevented. Since the oil shields the application surface from the outside air, it may be applied by protruding slightly outside the application region.

In the case where a part of the soluble alloy on the inner peripheral surface of the recess is exposed to the outside air with the piston completely inserted into the recess, the soluble alloy, the bottom of the recess and the cylinder exposed to the outside air Comparing the portion of the fusible alloy between the bottom surfaces, the fusible alloy in the part exposed to the outside air has a larger area in contact with the outside air than the volume, so it melts due to oxidation or corrosion of the surface of the fusible alloy The temperature tends to change. If there is a difference in melting temperature depending on the part of the fusible alloy, the part where the fusible alloy has melted and the solid part will coexist in the event of a fire, which may hinder the smooth operation of the sprinkler head. However, by applying oil to the part where the soluble alloy is exposed to the outside air, oxidation and corrosion can be prevented, and changes in the melting temperature can be prevented.

According to the present invention, a concave portion in which a piston can be fitted is formed in a fusible alloy in a cylinder, and the piston is inserted into the concave portion to constitute a heat sensitive body, so that the piston is applied to the fusible alloy. Since the force acts uniformly on the bottom surface of the dent, the structure is such that creep does not easily occur.

In addition, in the event of a fire, when the fusible alloy on the side surface of the dent is melted by the heat of the fire, a gap is formed between the bottom of the dent and the bottom of the cylinder so that the molten soluble alloy can be discharged out of the cylinder. It is possible to discharge the soluble alloy without delay.

Further, by applying oil to the surface of the fusible alloy, oxidation and corrosion can be prevented, and the melting temperature can be prevented from changing. Furthermore, if oil is also applied to the surface of the piston, it is possible to prevent the generation of corrosion products near the boundary between the histone and the soluble alloy, and to prevent the piston from sticking due to the corrosion products.

The front view of the frame type sprinkler head by 1st embodiment. XX sectional drawing of the sprinkler head of FIG. Sectional drawing which shows the decomposition | disassembly state of the heat sensitive body of FIG. Sectional drawing which shows the state which apply | coated oil to the concave inner surface of a soluble alloy. (A) Form in which the piston protrudes from the recess (b) Form in which the outer peripheral surface of the fusible alloy protrudes from the cylinder (c) Form in which the piston is housed in the recess From FIGS. 5 to 7 below (a) (C) Cylinder / Piston form is the same as Fig. 4 Sectional drawing which shows the state which apply | coated oil to the location exposed to the open air of a soluble alloy. Sectional drawing which shows the state which apply | coated the oil to the surface of the piston inserted in the recess of a soluble alloy. Sectional drawing which shows the state which apply | coated oil to the boundary part of the piston inserted in the recess of the soluble alloy, and the recess. Sectional drawing equivalent to FIG. 3 which shows embodiment of another heat sensitive body. Fire extinguishing equipment piping system diagram in which the sprinkler head of FIG. 1 is installed. Sectional drawing of the flash type sprinkler head which is embodiment of this invention. Sectional drawing of the multi-type sprinkler head which is other embodiment of this invention.

Embodiments of the present invention will be described below with reference to FIGS. 1 is a front view of a frame-type sprinkler head, FIG. 2 is a sectional view taken along line XX of the sprinkler head of FIG. 1, FIG. 3 is a sectional view of an exploded state of the heat sensitive body of FIG. FIG. 5 is a cross-sectional view showing a state in which oil is applied to a portion exposed to the outside air of the soluble alloy, and FIG. 6 is a surface of the piston inserted into the recess of the soluble alloy. FIG. 7 is a cross-sectional view showing a state where oil is applied to the boundary portion between the piston inserted into the recess of the soluble alloy and FIG. 8 is an embodiment of another heat-sensitive body. It is sectional drawing equivalent to FIG.

The sprinkler head shown in FIG. 2 is a frame-type sprinkler head having a horseshoe-shaped frame in the main body.

The sprinkler head in FIG. 2 includes a main body 1, a deflector 2, a valve body 3, a thermal decomposition unit 4, and a thermal body 5.

The main body 1 has a male screw connected to a fire extinguishing equipment pipe on the outer peripheral surface, and a nozzle 6 capable of discharging water in the pipe is bored inside. The end face of the nozzle 6 on the outlet side is provided with two frames 7 extending from the end face in the direction of water discharge of the nozzle (upward direction in FIGS. 1 and 2). Boss portions 8 that intersect on the line are formed.

A deflector 2 that causes water discharged from the nozzle 6 to collide and scatter in four directions is fixedly installed at the tip of the boss 8. The deflector 2 has a disk shape, and a plurality of notches are formed on the periphery (illustration of the notches is omitted). A female screw 8 </ b> A is formed inside the boss portion 8.

The valve body 3 closes the nozzle 6, is disposed at the outlet end of the nozzle 6, and is pressed toward the nozzle 6 by a thermal decomposition unit 4 described later.

The thermal decomposition unit 4 includes a lever 10, a support 11, and a balance 12. The thermal decomposition unit 4 is configured by combining each part and a thermal body 5 described later, and each part is assembled in a state where a load is applied.

The lever 10 has an L-shaped cross section, and a hemispherical groove 10A is engraved on the surface on the boss portion 8 side, and a V-shaped groove 10B is engraved on the back surface inside the hemispherical groove 10A.

The support 11 has a substantially elliptical shape, and a hole 11A is formed in the center. An engagement branch 11B is bent outward from the hole 11A from the end of the hole, and a support branch 11C is formed from the other end of the hole 11A. It is bent in the same direction as the engaging branch 11B. Both ends of the column 41 are knife edges.

The balance 12 has a sickle neck shape with one wide end, a hemispherical protrusion 12A is formed on the wide width portion, and an engagement portion 12B that is bent in an oblique direction is formed on the other end.

The heat sensitive body 5 includes a cylinder 14, a fusible alloy 15, and a piston 16. The cylinder 14 has a bottomed cylindrical shape, and the fusible alloy 15 is placed inside. The fusible alloy 15 is integrated by injecting and hardening a molten alloy material into the cylinder 14. Further, the soluble alloy 15 shown in the drawing may be inserted into the cylinder 14 in advance and integrated. A mortar-shaped engagement hole 14 </ b> A is formed on the outer side of the bottom surface of the cylinder 14.

As shown in FIG. 3, a recess 17 into which the piston 16 can be inserted is formed in the surface of the fusible alloy 15. Oil 18 is applied to the surface of the recess 17. The oil 18 is applied to the surface of the recess 17 before the piston 16 is inserted into the recess 17. When the piston 16 is inserted into the recess 17, the oil 18 is interposed between the piston 16 and the recess 17. The

The amount of the oil 18 is an amount that covers the surface of the recess 17 uniformly. Since the oil 18 prevents oxidation and corrosion of the soluble alloy 15, the oil 18 is applied to the inner surface of the recess 17 of the soluble alloy 15 shown in FIGS. It is applied not only to the inside of 17 but also to the end face of the fusible alloy 15 as shown in FIGS. Further, in the present embodiment, not only the soluble alloy 15 as shown in FIG. 6 but also the oil 18 is applied to the surface of the piston 16, or the boundary portion between the soluble alloy 15 and the cylinder 14 as shown in FIG. It is also applied to prevent the oxidation and corrosion of the fusible alloy 15.

When oil with low viscosity is used as the oil 18, the oil 18 can be applied after assembly of the heat sensitive body 5 by utilizing the property of low viscosity. The application method is preferably spraying, brushing, or dipping. Oil with low viscosity is likely to penetrate into the slight gap between the piston 16 and the recess 17 by capillary action.

When oil having a high viscosity is used, the piston 16 can be inserted after the oil is injected into the dent 17 to crush the oil 18 and can be spread over the surface of the dent 17. Alternatively, the oil 18 may be applied after the piston 16 is inserted into the recess 17. Specifically, as shown in FIG. 8 (a), the structure in which the piston 16 is completely inserted in the vicinity of the entrance of a slight gap between the piston 16 and the recess 17 or in the recess 17 as shown in FIG. 8 (b). In this case, the coating is applied to the portion of the recess 17 exposed to the outside air and the surface of the piston 16. The oil 18 hardly penetrates into the gap, but the gap can be blocked from outside air for a long time.

Further, the oil 18 has an effect of making it difficult for the piston 16 to come out of the recess 17. When the viscosity of the oil 18 is low, there is an effect due to surface tension. Conversely, when the viscosity is high, the piston 16 is less likely to be detached from the recess 17 due to the viscosity of the oil itself. Since the piston 16 is difficult to come off, even when the heat sensitive body 5 is turned upside down when assembling the sprinkler head, the handling becomes easy and the assembling workability is improved.

The oil used in the present invention is excellent in heat resistance and chemical resistance, and fluorine or silicone oil / grease having a maximum use temperature of 100 to 300 ° C. is used.

The heat sensitive body 5 having the above-described configuration is incorporated in the lever 10, the movable piece 11, and the balance 12 to constitute a unit of the heat-sensitive decomposition unit 4. The structure of the unit is shown below.

The hemispherical groove 10 </ b> A of the lever 10 is engaged with the hemispherical tip of the impress screw 21, and the end of the lever 10 is engaged with the engaging portion 12 </ b> B of the balance 12. Further, the V-shaped groove 10 </ b> B of the lever 10 is engaged with one end of the column 11, and the other end of the column 11 is engaged with the V-shaped groove of the valve body 3. The balance 12 engaged with the end of the lever 10 is inserted through the hole 11A of the support 11 and the lower surface in FIG. 2 is on the support branch 11C of the support 11.

An engagement hole 14 </ b> A of the cylinder 14 is engaged with the engagement branch 11 </ b> B of the column 11. The hemispherical protrusion 12A of the balance 12 is engaged with the hole 16A of the piston 16 inserted into the cylinder 44.

When the impress screw 21 is screwed into the female screw 8A of the boss 8 of the main body 1, a load is applied from the tip of the impress screw 21 to the thermal decomposition portion 4, and the valve body 3 is pressed toward the nozzle 6 side. Then, the nozzle 6 is closed.

The thermal decomposition part 4 is in a state in which a load is always applied by the valve body 3 and the impress screw 21, and a force acts from the engagement branch 11 </ b> B of the column 11 to the cylinder 14, and from the hemispherical protrusion 12 </ b> A of the balance 12. A force acts on the piston 16 and a compressive force acts on the fusible alloy 15.

Next, the operation of the sprinkler head of the present invention will be described.

In the sprinkler head of the present invention, as shown in FIG. 9, the male screw 5 of the sprinkler head SH is connected to the standing portion 31 of the fire-extinguishing equipment pipe P disposed under the roof 30, that is, indoors, and the deflector 2 is attached to the roof. It is installed to face the 30 side.

When a fire occurs, the ambient temperature rises due to the heat of the fire, and the cylinder 14 absorbs the heat. The soluble alloy 15 in the cylinder 14 is melted by the heat transmitted from the cylinder 14. Further, the oil 18 is also softened by the surrounding heat, the viscosity is lowered, the adhesive strength with the piston 16 is lowered, and the piston 16 can move smoothly.

When the fusible alloy 15 is melted, the piston 16 is immersed in the cylinder 14 and the balance of the force of the thermal decomposition unit 4 is lost. The balance 12 has a hemispherical protrusion 12A on the piston 16 side with the tip of the support branch 11C as a fulcrum. Rotate. The rotation of the balance 12 disengages the lower end portion of the lever 10 from the engagement portion 12B of the balance 12, and the lower end portion rotates around the hemispherical groove 10A as a fulcrum. As the lever 10 rotates, the support 11 is also released from the lever 10 and the thermal decomposition unit 4 is disassembled.

Since the force that was pressing the valve body 3 toward the nozzle 6 is released by disassembling the thermal decomposition unit 4 that supported the valve body 3, the valve body 3 is separated from the nozzle 6, and the nozzle 6 and the piping Water is released.

The water discharged from the nozzle 6 collides with the deflector 2 and is scattered in all directions, thereby suppressing and extinguishing the fire.

  The form of the sprinkler head of the present invention is not limited to the above, and for example, it can be used in both the vertical direction as described in Japanese Utility Model Publication No. 42-16553. Further, the flash type sprinkler head described in FIG. 10 and JP-A-7-284545 and the multi-type sprinkler head shown in FIG. 11 can be used.

Alternatively, it can also be used for a sprinkler head having a structure described in Japanese Patent Publication No. 7-16531 or a utility model registration No. 2544162 in which a piston passes through a cylinder.

1 body
2 Deflector
3 Disc
4 Thermal decomposition part
5 Heat-sensitive body
6 nozzles
7 frames
8 Boss
10 Lever
11 Movable piece
12 Balance
14 cylinders
15 Soluble alloy
16 piston
17 dent (dent)
18 oil

Claims (5)

A body with a nozzle connected to the fire-extinguishing equipment piping, a valve body that stops the nozzle, and a heat-sensitive body that presses and holds the fusible alloy contained in the cylinder with a piston. The valve body has a thermal decomposition part that opens the nozzle when the piston moves into the cylinder by softening or melting, and a recess part for inserting the piston is formed in the soluble alloy. Sprinkler head , wherein oil is applied to the inner surface of the part . The sprinkler head according to claim 1 , wherein oil is applied to a portion of the soluble alloy exposed to the outside air. The sprinkler head according to claim 1 or 2 , wherein oil is applied to a surface of the piston inserted into the recess of the soluble alloy. The sprinkler head according to any one of claims 1 to 3 , wherein oil is applied to a boundary portion between the piston and the recessed portion inserted into the recessed portion of the fusible alloy. The sprinkler head according to any one of claims 1 to 4 , wherein oil is applied to the entire heat sensitive body.

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