Closed-type foam head

Abstract

To provide a sprinkler head usable for foam fire-extinguishing equipment for locally spraying fire-extinguishing liquid in a fire-extinguishing area where a fire has occurred, and fire extinguishing equipment.SOLUTION: A closed-type foam head comprises: a head body 10 including a nozzle part 11 that supplies fire-extinguishing liquid; a closing part 20 that closes an outlet 11b2 of the nozzle part 11 when there is no fire and opens the outlet 11b2 upon sensing heat of a fire; a foam-generating part 30 that includes a deflector 31 having a plurality of slits 31b through which the fire-extinguishing liquid can pass, and a foam-generating member 32 having a mesh, and foams and splashes the fire-extinguishing liquid flowing from the outlet 11b2; and a movable support part 40 that supports the foam-generating part 30 on the head body 10, with the foam-generating part 30 movable in an axial direction of the nozzle part 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a sprinkler head for fire suppression. [Background technology]

[0002] For example, a fixed foam fire extinguishing system is installed in an indoor parking lot, which is a fire prevention object. The fixed foam fire extinguishing system divides the parking lot into multiple fire extinguishing areas of a specified area, and a foam head is installed in each fire extinguishing area. The foam heads are connected to the piping of the fire extinguishing system, and when a fire is extinguished, a foam solution (fire extinguishing liquid) is sprayed simultaneously from the foam heads in all the fire extinguishing areas, thereby extinguishing the fire. Therefore, fixed foam fire extinguishing systems are particularly excellent at extinguishing fires over a wide area. Foam heads used in such foam fire extinguishing systems are, for example, those described in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-291921 Summary of the Invention [Problem to be solved by the invention]

[0004] However, extinguishing fluid sprayed in fire-fighting areas where no fire has occurred does not contribute to extinguishing the fire, and from the perspective of environmental protection, it is preferable to reduce the amount of extinguishing fluid containing chemicals (foam extinguishing agents) used as much as possible.

[0005] Therefore, the present disclosure provides a sprinkler head and fire extinguishing equipment that can be used in a foam fire extinguishing equipment that locally sprays fire extinguishing liquid in a fire extinguishing area where a fire has occurred. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a closed type foam head comprising: a head body having a nozzle portion for supplying extinguishing liquid; a blocking portion that blocks the outlet of the nozzle portion when there is no fire and opens the outlet upon detecting the heat of a fire; a deflector having multiple slits through which the extinguishing liquid can pass; a foam generating portion that includes a meshed foam generating member and foams and splashes the extinguishing liquid flowing from the outlet; and a movable support portion that supports the foam generating portion on the head body while allowing the foam generating portion to move in the axial direction of the nozzle portion.

[0007] According to the first embodiment of the closed-type foam head, the blocking portion blocks the nozzle outlet when there is no fire, and when there is a fire, the blocking portion senses the heat of the fire and opens the outlet to release the extinguishing liquid. By installing such a closed-type foam head in each fire extinguishing area, the extinguishing liquid can be locally sprayed in each fire extinguishing area where a fire has occurred. This reduces the amount of extinguishing liquid, particularly foam extinguishing agents, used. The "extinguishing liquid" used in the closed-type foam head of the present disclosure can be, for example, a foam extinguishing agent. Examples of foam extinguishing agents include, but are not limited to, protein foam extinguishing agents, synthetic surfactant foam extinguishing agents, and aqueous film-forming foam extinguishing agents. Furthermore, foam extinguishing agents may include, but are not limited to, those specified in various firefighting laws and regulations in Japan and other countries. Furthermore, the extinguishing liquid usable in the closed-type foam head can be a liquid that does not generate foam, such as water.

[0008] According to the above aspect, the foam generating unit includes a movable support member that supports the foam generating unit on the head body while allowing the foam generating unit to move axially in the nozzle unit. This allows the closed-type foam head to be made smaller by moving the foam generating unit closer to the head body via the movable support member. Therefore, for example, the space required for installation of the closed-type foam head can be reduced, and the packaging volume of the closed-type foam head can be reduced, contributing to reduced storage and transportation costs. Furthermore, by installing the closed-type foam head on fire extinguishing equipment piping with the foam generating unit farthest from the head body via the movable support member, the foam generating unit can be brought closer to the floor of a building, etc. In other words, the foam generating unit can be installed closer to the object to be extinguished on the floor, allowing foam to be sprayed efficiently and effectively onto the object to be extinguished.

[0009] The foam generating member may be configured to have a bowl-shaped container that can accommodate the deflector and a portion of the closing portion. In this case, the portion of the closing portion may include a thermosensitive decomposition portion. This allows the deflector and a portion of the closing portion (thermosensitive decomposition portion) to be accommodated in the bowl-shaped container, thereby making it possible to reduce the size of the closed foam head.

[0010] The blocking portion may include a heat-sensitive decomposition portion that senses the heat of a fire and activates decomposition, and a detachment gap may be formed between the head body and the foam-generating portion to serve as a path for the decomposed heat-sensitive decomposition portion to fall off. More specifically, the detachment gap may be formed between the head body and the foam-generating portion by the movable support portion moving the foam-generating portion away from the head body.

[0011] According to this, when the thermal decomposition section is decomposed, its components can be dropped out of the closed foam head through the drop-out gap, thereby preventing the occurrence of lodgement, whereby the decomposed components remain in the foam generating section.

[0012] The movable support portion includes a guide pin holding portion and a guide pin, the guide pin holding portion has a guide pin insertion hole and is provided on the head body, and the guide pin can be configured to be fixed to the foam generating portion and held in the guide pin insertion hole in a state where it can move along the axial direction.

[0013] The foam generating unit can be supported in a movable state by a simple movable structure consisting of a guide pin holding portion of the head body and a guide pin fixed to the foam generating unit. Furthermore, because the movable structure is simple, the closed type foam head can be made smaller even if it is configured with a movable structure.

[0014] The guide pin holder may be configured as a protrusion protruding from the outer surface of the head body. Since the guide pin holder is a protrusion, the head body and the closed-type foam head including the same can be made smaller.

[0015] The foam generating section may further include a disk that protrudes from the surface of the deflector toward the nozzle section and has a flat, planar portion at its protruding end that sprays the extinguishing liquid in a radial direction centered on the axial direction.

[0016] The extinguishing liquid discharged from the outlet of the nozzle hits a disk positioned opposite the outlet. For example, if the disk facing the outlet is conical, the extinguishing liquid is deflected along the slope of the conical surface that forms an obtuse angle with the axial direction of the nozzle. In contrast, if the protruding end of the disk is a flat, planar portion, the flow of the extinguishing liquid collides with the flat, planar portion and is redirected to a radial direction centered on the axial direction (nozzle axis of the nozzle). Compared to a conical surface, the flat, planar portion applies a greater impact to the extinguishing liquid when it collides, thereby promoting contact with air and thereby increasing the foam expansion ratio.

[0017] The flat portion may be configured as a plane perpendicular to the axial direction.

[0018] This flat surface allows the extinguishing liquid to make a strong impact against the perpendicular surface, promoting the intake of air into the extinguishing liquid and encouraging the extinguishing liquid to splash outward from the flat surface of the disk. Here, "perpendicular" does not necessarily mean that the angle between the axial direction of the nozzle (nozzle axis) and the flat surface is exactly 90°, but can also include angles around 90° that can produce a similar effect.

[0019] The disk may be configured to have a side surface that forms a step between the planar surface and the deflector.

[0020] With this, the flow of the extinguishing liquid is diverted by the flat portion into a radial direction centered on the axial direction of the nozzle portion, and then flows down from the outer edge of the flat portion through the step on the side portion onto the deflector, which gives momentum to the flow of the extinguishing liquid and encourages it to flow from the disk through the slits in the deflector to the foam-generating portion.

[0021] The slits may include a first slit having a length that extends from the outer edge of the deflector to the disk, and the first slit may be configured to have a hole portion at the end on the disk side where the slit width is expanded.

[0022] This allows the extinguishing liquid to flow to the foam-generating member below the deflector along the entire length of the first slit, i.e., the radial direction of the deflector. Furthermore, the hole having a shape that widens the slit width can increase the amount of extinguishing liquid flowing to the foam-generating member on the disk side of the first slit. This makes it easier to flow the extinguishing liquid to the foam-generating member along the entire length of the first slit.

[0023] The head body may further have a frame portion, and the frame portion may be configured to have a plurality of protruding walls protruding from an outer position of the outlet toward the foam generating portion, and openings provided between adjacent protruding walls for introducing air for foaming into the fire extinguishing liquid released from the outlet.

[0024] The fire-extinguishing liquid flowing out of the outlet of the nozzle portion can fall while taking in air through the opening as it passes through the frame portion. This increases the foaming ratio of the foam generated in the foam generating portion. The protruding wall can be configured as a peripheral wall portion that protrudes in an arc shape from an outer position of the outlet toward the foam generating portion. The protruding wall can also be configured as a rod-shaped leg portion that protrudes from an outer position of the outlet toward the foam generating portion.

[0025] The foam generating member may have a peripheral wall and a bottom, and the bottom may have an annular bulge that bulges in a direction away from the deflector.

[0026] According to this, since the foam generating member has an annular bulge portion, a reservoir of fire extinguishing liquid can be provided between the annular bulge portion and the deflector, which can particularly promote the scattering of foam downward from the closed type foam head.

[0027] The upper surface of the deflector is positioned lower than the upper edge of the foam generating member, and the height difference between the upper surface and the upper edge can be configured to be greater than 1 / 2 and less than 3 / 4 of the depth of the foam generating member.

[0028] This makes it possible to make the components of the thermal decomposition unit more likely to fall when the thermal decomposition unit is in decomposition operation.

[0029] The deflector may have an outer diameter larger than the inner diameter of the head body.

[0030] This allows the extinguishing liquid discharged from the outlet of the head body to fall reliably onto the surface of the deflector, thereby enhancing the deflector's straightening effect on the extinguishing liquid, the foaming effect of the extinguishing liquid that has passed through the deflector, and the foam scattering effect of the deflector and foam generating member.

[0031] A second aspect of the present disclosure is a foam fire extinguishing system including the closed-type foam head.

[0032] According to the foam fire extinguishing system of the second aspect, the amount of fire extinguishing liquid (fire extinguishing foam) used can be reduced because the fire extinguishing liquid (fire extinguishing foam) can be sprayed locally in the area where the fire has occurred, and the amount of fire extinguishing liquid containing chemical substances (foam fire extinguishing agent) used can be reduced. This makes it possible to realize a fire extinguishing system that can contribute to reducing the environmental load. [Brief explanation of the drawings]

[0033] In order to explain one aspect of the present disclosure based on an embodiment, drawings necessary for the explanation will be briefly described. The drawings are merely examples of the embodiment and do not limit the scope of the embodiment according to the present disclosure. A person skilled in the art can obtain drawings of other related embodiments based on the drawings of the present disclosure without using any special inventive ability.

[0034] [Figure 1] FIG. 1 is a front view of a closed-type foam head according to one embodiment. [Figure 2] Figure 2 is a cross-sectional view of the closed type foam head of Figure 1 taken along a plane connecting the center of the right side surface, the central axis of the nozzle portion, and the center of the left side surface. [Figure 3] 3 is a cross-sectional view showing the closed type foam head of FIG. 2 with the movable support part moved. [Figure 4] 2 is an exploded perspective view of the heat-sensitive decomposition section of the closed-type foam head of FIG. 1; [Figure 5] Cross-sectional view of the assembled thermodecomposition unit of Figure 4. [Figure 6] FIG. 2 is a plan view of the deflector and disc of the closed foam head of FIG. 1. [Figure 7] 2 is a right side view including a partial cross section of the foam generating section of the closed type foam head of FIG. 1 after disassembly operation. DETAILED DESCRIPTION OF THE INVENTION

[0035] Hereinafter, embodiments of the present invention will be described in detail. The following description does not limit the content of the present invention described in the claims, but is an example to facilitate understanding of the present invention. The components of the embodiments, such as shapes, structures, members, and combinations of multiple members, are not necessarily all essential to the means for solving the problems of the present invention. An embodiment in which some of the components constituting the embodiments are omitted can also be a means for solving the problems.

[0036] Terms used in this specification and claims, such as "center," "vertical," "horizontal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "plumb," "horizontal," "orthogonal," "right angle," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," and terms including these, are all based on the drawings and are used for the convenience of describing the invention and embodiments. Unless otherwise specified, these terms do not limit the claims and embodiments. In particular, angle-related terms such as "vertical," "vertical," "horizontal," "orthogonal," and "right angle" are used for the convenience of describing the invention and embodiments. For example, "orthogonal" refers to a 90° intersection angle formed between multiple intersecting elements, and intersection angles of approximately 90° are also included in "orthogonal" unless otherwise specified. "Axial direction" refers not only to a direction along the central axis of a member, but also to a direction along a line parallel to that central axis.

[0037] In this specification and claims, terms such as "first" and "nth" (n is a natural number) following "first" are used to distinguish between different elements and do not indicate a particular order or priority.

[0038] In this specification and claims, unless otherwise clearly defined or limited, terms such as "attached," "coupled," "connected," "fixed," and "contacted" may be understood broadly. Regarding the example of "connected," fixed connection, detachable connection, removable connection, and integral connection may all be included in "connected." Furthermore, unless otherwise specified, direct connection without an intermediary, indirect connection with an intermediary, and the like may also be included in "connected." Other terms such as "attached," "coupled," and "fixed" may also be understood in the same way as "connected." Furthermore, regarding the example of "contacted," both direct contact without an intermediary and indirect contact with an intermediary may both be included in "contacted" unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances.

[0039] In this disclosure, the same names are used for components having the same uses and functions. Furthermore, the same reference numerals are used in the drawings for components common to multiple embodiments, and redundant explanations in each embodiment will be omitted.

[0040] The terms used in the following description are for the purpose of describing embodiments only and are not intended to limit the scope of the present disclosure. Elements described in the specification and claims are intended to include the plural unless the context clearly dictates otherwise: singular or plural.

[0041] The terms "and" and "or" can include any and all combinations of one or more of the listed elements before and after it. By way of example, "A or B" can mean "A, B, or both A and B." "A," "B," and "both A and B" all each satisfy "A or B."

[0042] The terms "includes," "including," "having," and / or "comprising" used in this specification and claims mean the presence of features, operations, elements, or steps, but do not exclude the presence or addition of one or more other features, operations, elements, steps, and / or groups thereof not listed in this specification and claims.

[0043] All embodiments and optional embodiments included in this disclosure may be combined with each other to form new embodiments. Such new embodiments may include combinations of embodiments omitting some of the components of the embodiments exemplified in this disclosure. Furthermore, all technical features and optional technical features included in this disclosure may be combined with each other to form new technical features.

[0044] Closed foam head configuration

[0045] The closed foam head 1 is used as a sprinkler head for a foam fire extinguishing system installed in a building or parking lot (including both flat-type and multi-story types; hereinafter simply referred to as "building, etc."). However, the closed foam head 1 can also be used as a sprinkler head for fire extinguishing systems other than foam fire extinguishing systems. The closed foam head 1 is connected to the piping of such fire extinguishing systems when used. A foam fire extinguishing system is equipped with multiple closed foam heads 1 corresponding to the fire extinguishing areas of the building, etc. The piping of the foam fire extinguishing system is filled with fire extinguishing liquid. As an example of the fire extinguishing liquid, a foam fire extinguishing agent (aqueous foam solution) can be used. The closed foam head generates foam from the foam fire extinguishing agent when a fire occurs and sprays the foam over the fire extinguishing area. Note that the term "fire extinguishing liquid" used in this disclosure refers to foam fire extinguishing agent or other fire extinguishing liquid.

[0046] The closed type foam head 1 comprises a head body 10, a closing section 20, a foam generating section 30, and a movable support section 40. Of these, the closing section 20 comprises a valve body 21 and a thermosensitive decomposition section 22, the foam generating section 30 comprises a deflector 31 and a foam generating member 32, and the movable support section 40 comprises a guide pin 41.

[0047] Head body 10 The head body 10 has a nozzle portion 11 and a frame portion 12. The entire head body 10 is formed as a single component that cannot be separated without cutting the material. Therefore, the head body 10 can reduce the number of components and costs compared to when the nozzle portion 11 and the frame portion 12 are separate components. However, the head body 10 may be formed of multiple components, including a portion corresponding to the nozzle portion 11 and a portion corresponding to the frame portion 12. The head body 10 can be formed as a cast, forged, or machined body of a metal material, for example, but can also be formed as other processed bodies.

[0048] <Nozzle part 11> Nozzle portion 11 is cylindrical and has a pipe connection portion 11a on the outer peripheral surface at one end thereof. Pipe connection portion 11a has a male thread and is connected to the piping P of the foam fire extinguishing system (see FIG. 7). Hollow portion 11b formed by the inner peripheral surface of nozzle portion 11 forms a flow path for the extinguishing liquid, with an inlet 11b1 for the extinguishing liquid at one end and an outlet 11b2 for discharging the extinguishing liquid at the other end.

[0049] The hollow portion 11b is provided with a nozzle member 13 (FIGS. 2 and 3). The nozzle member 13 is fixed to the hollow portion 11b. The fixing means may be, for example, press-fitting, fitting, locking, or adhesive, but is not limited to these. In this embodiment, for example, a fixing ring 11b4 is fitted into an annular recess 11b3 provided in the hollow portion 11b, and the upper end of the nozzle member 13 abuts against the fixing ring 11b4. This restricts movement of the nozzle member 13 in the removal direction, and the nozzle member 13 is fixed to the hollow portion 11b.

[0050] The nozzle member 13 has a cylindrical portion 13a and a throttle portion 13b. The cylindrical portion 13a has a cylindrical shape that extends along the direction of the central axis (nozzle axis) of the nozzle portion 11. The throttle portion 13b is formed as an annular wall that protrudes from the lower end of the cylindrical portion 13a in the direction of the nozzle axis, and its inner circumferential surface forms a throttle hole 13c. The throttle hole 13c has a smaller diameter than the inner diameter of the cylindrical portion 13a. Therefore, the fire-extinguishing liquid that flows into the cylindrical portion 13a has its flow diameter throttled by the throttle hole 13c before flowing out of the outlet 11b2. This improves the foaming efficiency of the foam water solution.

[0051] A more detailed explanation follows. The throttle hole 13c forms a negative pressure region, causing a contracted flow of the extinguishing water. In particular, the throttle portion 13b forms a step that intersects with the inner circumferential surface of the hollow portion 11b, thereby rapidly reducing the flux diameter of the extinguishing water. At the same time, the throttle portion 13b generates turbulence in the extinguishing liquid that impinges thereon. When the contracted flow passes through the throttle portion 13b and flows into a positive pressure region (the outlet 11b2, which has a larger diameter than the throttle portion 13b), the flux diameter of the extinguishing liquid expands, causing turbulence in the extinguishing liquid. Thus, by providing multiple different-diameter portions (the inlet 11b1, the throttle hole 13c, and the outlet 11b2) in the flow path of the nozzle portion 11, the flux diameter of the extinguishing liquid is changed in multiple stages, generating turbulence, thereby improving the foaming efficiency of the extinguishing liquid.

[0052] <Frame part 12> The frame portion 12 has a beam-like portion 12a, a peripheral wall portion 12b as a "protruding wall," and an opening portion 12c.

[0053] The beam-shaped portion 12a is located on the lower end side of the head main body 10 and is formed in an arc shape. In other words, the beam-shaped portion 12a is formed as a beam (beam shape) connecting adjacent peripheral wall portions 12b. Locking steps 12a1 for locking the thermal decomposition unit 22 are formed on the inner peripheral surfaces of the beam-shaped portion 12a and the peripheral wall portion 12b described later. The locking steps 12a1 are formed in a pair of semicircular arc shapes in the circumferential direction of the beam-shaped portion 12a. The lower end of the beam-shaped portion 12a has an open end into which the thermal decomposition unit 22 can be inserted. A pair of grooves are formed between the opposing ends of the pair of locking steps 12a1 into which locking arms 22a1 of a pair of levers 22a of the thermal decomposition unit 22 described later can be inserted. The thermal decomposition unit 22 is inserted into the frame 12 by passing the pair of levers 22a through the grooves. Then, by rotating the thermal decomposition unit 22, the tip of the locking arm 22a can be locked with the locking step 12a1. When the thermal decomposition unit 22 is locked, a load is applied to the beam 12a to press the valve body 21 against the outlet 11b2 to close it, causing elastic deformation (deflection) in the direction of the deflector 31. The elastic deformation of the beam 12a creates a spring force, which acts to repel the components of the thermal decomposition unit 22 out of the closed-type foam head 1 when the closed-type foam head 1 is activated. Therefore, the beam 12a functions to prevent lodgement.

[0054] The peripheral wall portion 12b is formed as an arc-shaped wall. For example, the peripheral wall portion 12b is formed in two places so as to connect the adjacent beam-like portions 12a, but is not limited to this and may be formed in one place or three or more places.

[0055] The peripheral wall portion 12b is formed with a guide pin holding portion 12b1 having a guide pin insertion hole 12b2. The guide pin holding portion 12b1 is a protrusion that protrudes outward from the peripheral wall portion 12b, and is cylindrical in shape as shown in FIGS. 1 and 7, for example. The guide pin holding portions 12b1 are formed at opposing positions (i.e., two positions) on the diameter line of the cylindrical frame portion 12, for example, but are not limited to this and may be one or three or more. The guide pin insertion hole 12b2 is formed as a through hole having a hole axis that is larger than the diameter of the guide pin 41 and parallel to the nozzle axis of the nozzle portion 11. The guide pin 41 is guided by the guide pin insertion hole 12b2 and is freely movable along the hole axis direction of the guide pin insertion hole 12b2.

[0056] The opening 12c is formed by the lower edge of the head body 10, the upper edge of the beam-like portion 12a, and the side edge of the adjacent peripheral wall portion 12b. The fire-extinguishing liquid flowing out from the outlet 11b2 of the nozzle portion 11 can take in air through the opening 12c as it passes through the inside of the frame portion 12. Therefore, the head body 10 having the opening 12c can increase the foam expansion ratio.

[0057] Closure part 20 The closing section 20 includes a valve body 21, a thermosensitive decomposition section 22, a saddle 23, and a compression screw 24 (FIGS. 2 and 3).

[0058] <Valve body 21> The valve body 21 is disk-shaped. The valve body 21 is pressed against the valve seat 11b5 by the thermal decomposition unit 22, and closes the outlet 11b2. When the thermal decomposition unit 22 is activated, the valve body 21 separates from the valve seat 11b5 and falls out of the closed-type foam head 1.

[0059] <Thermal decomposition unit 22> The thermal decomposition unit 22 is engaged with a locking step 12a1 formed on the beam portion 12a of the frame portion 12, and in the event of a fire, it is decomposed by the heat of the fire, releasing the closing load applied to the valve body 21. As shown in Figures 4 and 5, the thermal decomposition unit 22 has a lever 22a, a support plate 22b, a balancer 22c, a cylinder 22d, a plunger 22e, a low-melting-point alloy 22f, a set screw 22g, and a heat collector 22h. The thermal decomposition unit 22 is configured as a unit component as shown in Figure 5, and can be stored and transported as a unit component. When assembling the sprinkler head, it is incorporated into the head body 10 in the state of the unit component shown in Figure 5.

[0060] Lever 22a is formed into a bent shape by a pair of metal pieces, for example. Lever 22a has a bent locking arm 22a1 and a locking protrusion 22a2 at its upper portion, and a locking hole 22a3 at its lower portion. The tip of locking arm 22a1 is locked to locking step 12a1 of beam portion 12a.

[0061] The support plate 22b is formed, for example, in a flat plate shape using a metal plate. The support plate 22b has a base 22b1 formed with a female-threaded screw hole 22b2, into which a set screw 22g is screwed. The support plate 22b has locking pieces 22b3 formed thereon, protruding from the base 22b1. The locking pieces 22b3 are formed at the four corners of the base 22b1. Each locking piece 22b3 is configured to be able to be pressed against the locking protrusion 22a2 of the lever 22a from below and locked by fastening a set screw 22g, described later, to the screw hole 22b2. Each locking piece 22b3 is configured to be able to be released from its locking with the locking protrusion 22a2 when the thermal decomposition unit 22 is operated to decompose.

[0062] The balancer 22c is formed in a ring shape from a metal plate, for example. A cylinder insertion hole 22c1 is formed in the center of the balancer 22c. A locking claw 22c2 is provided at a position opposite the balancer 22c. The locking claw 22c2 is configured to be inserted into and lock into a locking hole 22a3 of the lever 22a, and is configured to be able to release the lock from the locking hole 22a3 when the thermal decomposition unit 22 is operating to decompose.

[0063] The cylinder 22d is formed into a cylindrical shape from a metal material, for example. The cylinder 22d has a large diameter portion 22d1 and a small diameter portion 22d2 therein (FIG. 5). The large diameter portion 22d1 accommodates an annular low-melting-point alloy 22f. The large diameter portion 22d1 has a flange portion 22d3 at its upper end. The flange portion 22d3 engages with the hole edge of the cylinder insertion hole 22c1 of the balancer 22c. The inner diameter of the small diameter portion 22d2 is approximately equal to the inner diameter of the annular low-melting-point alloy 22f.

[0064] The small diameter portion 22d2 has a heat collector holding portion 22d4 at its tip (lower end). The heat collector holding portion 22d4 is formed as a bent portion that holds the inner peripheral edge of the heat collector 22h (the first heat collector 22h1 and the second heat collector 22h2) by clamping them from above and below.

[0065] The heat collectors 22h (first heat collector 22h1 and second heat collector 22h2) are held in the cylinder 22d and are formed in a disk shape from a metal with good thermal conductivity, such as copper or a copper alloy. The heat collectors 22h absorb the heat of a fire and transfer it to the low-melting-point alloy 22f inside the cylinder 22d, melting the low-melting-point alloy 22f. The heat collectors 22h have a disk housing portion 22h3 capable of housing the upper end side of a disk 33 (described later) (Figures 2 and 3). The disk housing portion 22h3 is formed in an umbrella shape. The disk housing portion 22h3 is formed by the inner surface of the umbrella-shaped second heat collector 22h2.

[0066] Plunger 22e is formed, for example, from a metal material into a cylindrical shape. Plunger 22e has a large diameter portion 22e1 and a small diameter portion 22e2. Plunger 22e is inserted into cylinder 22d, and a step portion 22e3 (FIG. 5) at the boundary between large diameter portion 22e1 and small diameter portion 22e2 and small diameter portion 22e2 come into contact with low-melting-point alloy 22f. Plunger 22e has a through hole 22e4, and a contact step portion 22e5 is formed in the middle of through hole 22e4, with which the tip of set screw 22g comes into contact (FIGS. 4 and 5).

[0067] The set screw 22g is formed, for example, from a metal material into a cylindrical shape. A male thread 22g1 is formed on the outer periphery of the set screw 22g. When the set screw 22g is screwed into the threaded hole 22b2 of the support plate 22b, the tip (lower end) of the set screw 22g presses the contact step 22e5 of the plunger 22e. Therefore, a compressive force is constantly applied to the low-melting-point alloy 22f by the step 22e3 of the plunger 22e and the small-diameter portion 22d2 of the cylinder 22d. Furthermore, a force is also applied to the support plate 22b and balancer 22c, which engage with the pair of levers 22a, in a direction that strengthens the engagement with the levers 22a, maintaining the engagement state between the levers 22a, the support plate 22b, and the balancer 22c. This forms the thermal decomposition unit 22 as a unit.

[0068] <Saddle 23> The saddle 23 is, for example, made of metal and formed into a curved shape. The saddle 23 is installed between the thermal decomposition unit 22 and the valve body 21. The saddle 23 is in pressing contact with the pair of levers 22a. A pair of abutment portions 23b that abut against the pair of levers 22a is formed on the back surface of the base portion 23a of the saddle 23 (FIG. 4). The abutment portions 23b are formed as recesses with a width slightly larger than the plate width of the curved upper ends of the locking arms 22a1. Therefore, the abutment portions 23b abut against the levers 22a while positioning the locking arms 22a1 inside the abutment portions 23b. The abutment portions 23b contact the curved upper ends of the locking arms 22a1 from above. A female thread 23c that penetrates the base portion 23a is formed in the center of the base portion 23a, and a compression screw 24 is threaded into the female thread 23c. The saddle 23 and the compression screw 24 function as load generating members.

[0069] <Compression screw 24> The compression screw 24 is, for example, a cylindrical screw made of metal. When the compression screw 24 is fastened to the internal thread 23c of the saddle 23 from the thermal decomposition section 22 toward the valve body 21, the tip of the compression screw 24 presses the valve body 21 toward the valve seat 11b5, causing the valve body 21 to close the outlet 11b2. When the compression screw 24 is fastened to the internal thread 23c of the saddle 23, the saddle 23 moves toward the thermal decomposition section 22, and the saddle 23 presses the bent upper end of the locking arm 22a1 downward, causing the bent tip of the locking arm 22a1 to press downward the locking step portion 12a1 of the beam-like portion 12a of the frame portion 12. This causes elastic deformation (deflection) in the beam-like portion 12a, causing it to displace slightly downward. This displacement of the beam-like portion 12a generates a spring force that, during decomposition operation, repels the components of the thermal decomposition portion 22 out of the frame portion 12. In this embodiment, a simple component configuration using the compression screw 24 and saddle 23 and simple assembly work can provide the load required for watertightness of the valve body 21 and bending deformation of the beam-like portion 12a.

[0070] Foam generation section 30 The foam generating unit 30 includes a deflector 31 , a foam generating member 32 , and a disk 33 .

[0071] <Deflector 31> The deflector 31 is formed in a disk shape from a metal plate, for example. The deflector 31 has a plurality of blades 31a and a plurality of slits 31b. The blades 31a include a first blade piece 31a1 and a second blade piece 31a2.

[0072] A plurality of first blades 31a1 are formed, each extending radially from the center of deflector 31. Adjacent first blades 31a1 are spaced apart by slits 31b. Each first blade 31a1 has a base 31a3 and multiple branch pieces 31a4. Base 31a3 is located on the disk 33 side and supports branch piece 31a4. Two branch pieces 31a4 branch off from base 31a3 and extend toward the outer edge of deflector 31. Compared to deflector 31, a deflector with fewer blades, in other words, a deflector with a wider blade, makes it more difficult to supply fire-extinguishing liquid to its rear side. However, by giving the first blade piece 31a1 a branched structure in which multiple branch pieces 31a4 branch off from a single base 31a3, the number of slits 31b (31b1, 31b2) can be increased, making it easier to supply fire-extinguishing liquid uniformly to the rear side of the deflector 31. Furthermore, it is difficult for fire-extinguishing liquid to flow to the disk-side portion of the rear side of the deflector 31. However, by adopting the branched structure described above, holes 31b3 that expand the slit width can be formed between two adjacent bases 31a3. This ensures a sufficient amount of fire-extinguishing liquid to be supplied to the disk-side portion through the holes 31b3, making it easier to supply fire-extinguishing liquid uniformly in the radial direction of the deflector 31.

[0073] The outer edge (outer periphery) of each of the plurality of first blade pieces 31a1 forms an annular imaginary circle. The diameter of the imaginary circle is larger than the inner diameter of the frame portion 12 (the inner peripheral surface 12d indicated by the two-dot chain line in FIG. 6). In other words, the length from the central axis of the head body 10 to the outer end of the first blade piece 31a1 is longer than the length from the central axis to the inner peripheral surface of the frame portion 12. The extinguishing liquid discharged from the outlet 11b2 into the frame portion 12 spreads. The spread flow of the extinguishing liquid can fall while coming into contact with the inner surface of the peripheral wall portion 12b of the frame portion 12. Since the length of the first blade piece 31a1 is longer than the inner diameter of the frame portion 12, the blade piece 31a can reliably receive the spread flow of the extinguishing liquid and direct it toward the foam generating member 32.

[0074] A plurality of second blades 31a2 are formed. The plurality of second blades 31a2 are formed as a pair of pieces extending along the diameter direction of the deflector 31. The second blades 31a2 are formed longer than the plurality of first blades 31a1 and have guide pin fixing portions 31a5 at their tip ends. The guide pin fixing portions 31a5 are, for example, through holes, through which the lower ends of the guide pins 41 are inserted and fixed. Fixing methods include, but are not limited to, crimping and welding. The guide pin fixing portions 31a5 are positioned to protrude from an imaginary circle formed by the outer edges of the plurality of first blades 31a1. This allows the blade area to function as the deflector 31 to be secured even while the movable support portion 40 is provided. In other words, a portion of the second blades 31a2 that performs the function of rectifying the flow of the fire-extinguishing liquid can be secured.

[0075] The multiple slits 31b are formed as through-grooves provided in a metal plate. The multiple slits 31b include first slits 31b1 and second slits 31b2. The first slits 31b1 and the second slits 31b2 have different lengths and are arranged alternately. This allows the number of slits 31b to be increased, making it easier to uniformly supply the extinguishing liquid to the back side of the deflector 31. This improves the uniform distribution of foam generated from the extinguishing liquid and sprayed by the foam generating member 32.

[0076] The first slit 31b1 is formed as a through-groove extending from the outer edge of the deflector 31 to the center of the deflector 31. That is, the first slit 31b1 has a length that extends from the outer edge of the first vane 31a1 (the outer edge of the deflector 31) to the disk 33. The extinguishing liquid flowing along the upper surface 33c1 of the disk 33 can reach the foam generating member 32 through various points of the first slit 31b1, which has a length that extends from the disk 33 side to the outer edge of the deflector 31. Therefore, the first slit 31b1 can promote the dispersion of foam downward from the closed-type foam head 1. The end of the first slit 31b1 on the disk 33 side has a hole 31b3 with an expanded slit width. The disk-side portion of the back side of the deflector 31 is less likely to allow the extinguishing liquid to flow, making it less likely for foam to disperse directly below the closed-type foam head 1. However, the hole 31b3 can increase the supply of extinguishing liquid to the disk-side portion, promoting the dispersion of foam directly below the closed-type foam head 1. The hole 31b3 is illustratively oval in shape, elongated along the longitudinal direction of the first slit 31b1. However, this is not limited thereto and the hole 31b3 can be formed as a round hole, a rectangular hole, or a combination thereof. The oval shape of the hole 31b3, which is longer than the width of the hole 31b3, allows for the formation of a flow path in the disk-side portion of the first slit 31b1 that is larger and longer than the slit width, thereby increasing the flow rate of extinguishing liquid to the disk-side portion. Furthermore, the oval shape of the hole 31b3 allows for the width of the base 31a3 of the first blade 31a1 formed between two adjacent holes 31b3 to be increased, thereby preventing the first blade 31a1 from bending at the base 31a3 due to the action of external force.

[0077] The second slits 31b2 are formed as through-grooves extending from the outer edge of the deflector 31 to the bases 31a3 of the first vanes 31a1. By providing the second slits 31b4 for each first vane 31a1, the flow path of the extinguishing liquid to the back side of the deflector 31 can be increased. In other words, the extinguishing liquid flowing along the upper surface 33c1 of the disk 33 can reach the foam generating member 32 through various points along the entire length of the second slits 31b2. Therefore, the second slits 31b2 can promote the scattering of foam downward from the closed-type foam head 1.

[0078] <Foam generating member 32> The foam generating member 32 is, for example, entirely made of a metal mesh. However, the foam generating member 32 is not limited to this, and may be, for example, a combination of a metal mesh and a metal piece without a mesh. The foam generating member 32 is, for example, entirely in the shape of a circular bowl. The bowl shape has a peripheral wall portion 32a and a bottom portion 32b, and the bottom portion 32b has an annular bulge portion 32c and a disk mounting portion 32d.

[0079] The peripheral wall portion 32a forms the annular side wall of the foam generating member 32. The peripheral wall portion 32a is a portion of the foam generating member 32 that is higher than the disk mounting portion 32d or the deflector 31, and a protruding edge 32e is formed at its upper end. The protruding edge 32e is a flange-shaped portion that protrudes horizontally and is formed in an annular shape around the entire periphery of the upper end of the foam generating member 32. Without the protruding edge 32e, there is a risk that components of the decomposed thermal decomposition unit 22 may get caught on the upper end of the peripheral wall portion 32a, which faces upward. However, by providing the protruding edge 32e in the shape of a horizontal flange at the upper end, it is possible to reduce the likelihood of components getting caught.

[0080] Annular bulge 32c of bottom 32b is a portion of foam generating member 32 that is lower than disk mounting portion 32d or deflector 31. Annular bulge 32c bulges in a direction away from deflector 31. In other words, annular bulge 32c is formed in a dome shape that bulges downward. The downward bulging shape of annular bulge 32c allows a reservoir of fire-extinguishing liquid to be formed between annular bulge 32c and deflector 31, thereby promoting the scattering of foam downward from closed-type foam head 1.

[0081] The disk attachment portion 32d of the bottom portion 32b is provided in the center of the foam generating member 32. The disk attachment portion 32d has a protrusion 32d1 and a disk insertion hole 32d2 (FIGS. 2 and 3).

[0082] The protrusion 32d1 protrudes from the annular bulge 32c toward the deflector 31. A recess 32d3 is formed on the back surface of the protrusion 32d1. The recess 32d3 functions as a storage section for the disk fixing section 33e, which will be described later. In other words, the disk fixing section 33e is surrounded by the inside of the recess 32d3. The recess 32d3 limits the amount of protrusion of the disk fixing section 33e from the bottom surface of the foam generating member 32, thereby reducing the risk of an object hitting the disk fixing section 33e and causing unnecessary external force, which could result in poor installation of the foam generating unit 30.

[0083] The disk insertion hole 32d2 is a through hole through which the connecting shaft 33d of the disk 33 is inserted.

[0084] <Disc 33> The disc 33 secures the deflector 31 and the foam generating member 32 to each other. The foam generating member 32 is fixed to the deflector 31 via the disc 33. The disc 33 has a main body 33a and a connecting receiving portion 33b. The main body 33a has a head 33c and a connecting shaft 33d. The connecting receiving portion 33b is a separate member (separate body) from the main body 33a and may be formed by a nut, for example. The connecting structure between the connecting shaft 33d and the connecting receiving portion 33b is, for example, a screw connection, but is not limited to this and may be other forms such as press fitting or crimping. The connecting structure between the connecting shaft 33d and the connecting receiving portion 33b constitutes the disc fixing portion 33e.

[0085] Head 33c of main body 33a is disk-shaped and has top surface 33c1 and side surface 33c2. Top surface 33c1 is formed as a "flat, planar portion." In other words, disk 33 protrudes from the surface of deflector 31 toward nozzle 11, and its protruding end (top surface 33c1) is formed as a flat, planar portion that sprays the extinguishing liquid in radial directions centered on the axial direction of nozzle 11.

[0086] Here, for comparison, consider a case where the protruding end (upper surface portion 33c1) of the disk 33 is conical. When the upper surface portion is conical, the extinguishing liquid is deflected along the inclination of the conical surface, which forms an obtuse angle with respect to the axial direction of the nozzle portion 11, and flows onto the surface of the deflector 31. In contrast, when the protruding end of the disk 33 is shaped as a flat surface, the flow of the extinguishing liquid is deflected radially from the nozzle axis by colliding with the flat surface. Compared to a conical surface, a flat surface provides a greater impact to the extinguishing liquid upon collision, promoting contact with air and thereby increasing the foam expansion ratio. In particular, the flat surface exemplified in this embodiment is a plane perpendicular to the nozzle axis. Such a flat surface provides a greater impact to the extinguishing liquid hitting the flat surface, promoting the intake of air into the extinguishing liquid and further promoting the extinguishing liquid to splash outward from the flat surface of the disk. It should be noted that the term "orthogonal" here is not limited to the angle between the nozzle axis and the flat plane portion being exactly 90 degrees, but can include angles around 90 degrees.

[0087] The connecting shaft 33d of the main body 33a is a male thread, and the connecting receiving part 33b is a nut with a female thread. The connecting shaft 33d is inserted through the hole 31b3 of the deflector 31 and the disk insertion hole 32d2 of the foam generating member 32, and is fastened to the nut of the connecting receiving part 33b arranged in the recess 32d3 of the foam generating member 32. As a result, the deflector 31 and the foam generating member 32 are sandwiched between the main body 33a and the connecting receiving part 33b.

[0088] The side surface portion 33c2 of the head portion 33c forms a step between the upper surface portion 33c1 and the deflector 31 along which the extinguishing liquid falls and flows. In other words, the height of the side surface portion 33c2 has the function of strengthening the flow of the extinguishing liquid from the upper surface portion 33c1 of the disk 33 to the deflector 31. After the flow of the extinguishing liquid is diverted by the upper surface portion 33c1 to a radial direction centered on the axial direction of the nozzle portion 11, the extinguishing liquid flows down from the outer edge of the upper surface portion 33c1 to the deflector 31 via the step of the side surface portion 33c2. This promotes the flow of the extinguishing liquid from the disk 33 through the slits 31b of the deflector 31 to the foam generating member 32.

[0089] The deflector 31 is disposed inside the foam generating member 32. The upper surface of the deflector 31 is disposed lower than the upper edge (protruding edge 32e) of the foam generating member 32, and the height difference between the upper surface of the deflector 31 and the protruding edge 32e can be configured to be between 1 / 2 and 3 / 4 of the depth of the foam generating member 32. This positional relationship between the deflector 31 and the foam generating member 32 makes it easier for components of the thermal decomposition unit to fall out of the foam generating member 32 when the thermal decomposition unit is in decomposition operation. In addition, because the deflector 31 is located inside the foam generating member 32, the fire-extinguishing liquid received by the deflector 31 can be reliably flowed to the foam generating member 32.

[0090] Movable support part 40 The movable support portion 40 has a plurality of guide pins 41. The movable support portion 40 includes the guide pin holding portion 12b1 of the head main body 10 described above.

[0091] <Guide pin 41> The guide pin 41 is formed, for example, in a rod shape from a metal material. There is a pair of guide pins 41, and they have the same length. The guide pins 41 hold the deflector 31 and the foam generating member 32 movably in the axial direction of the nozzle portion 11. A retaining portion 41a that abuts against the guide pin holding portion 12a2 is formed at the upper end of the guide pin 41. The guide pin 41 is held in the guide pin insertion hole 12b2 by the retaining portion 41a. The outer peripheral surface of the retaining portion 41a and the hole surface of the guide pin insertion hole 12b2 are formed in relative shapes such that their surfaces overlap. Specifically, the retaining portion 41a has an outer peripheral surface formed by an inclined surface in an inverted cone shape. The guide pin insertion hole 12b2 has a funnel surface that is shaped relative to the inclined surface. Therefore, when the retaining portion 41a is inserted into the guide pin insertion hole 12b2, the guide pin 41 is positioned with the pin axis of the guide pin 41 aligned with the hole axis of the guide pin insertion hole 12b2. Positioning each guide pin 41 in this manner facilitates maintaining the horizontal orientation of the deflector 31, so that the center of the outlet 11b2 and the center of the deflector 31 are aligned on the nozzle axis, allowing the fire-extinguishing liquid to be more reliably sprayed radially toward the center of the deflector 31. Furthermore, the movable support portion 40 described above allows the foam generating portion 30 to be movably supported with a simple structure consisting of the guide pin holding portion 12b1 of the head body 10 and the guide pin 41 fixed to the foam generating portion 30. Furthermore, the simple movable structure allows the closed-type foam head 1 to be made smaller.

[0092] The guide pin 41 has a deflector fixing portion 41b at its lower end. The deflector fixing portion 41b is a portion where the lower end of the guide pin 41 is inserted into a hole 31b3 of the deflector 31 to fix the guide pin 41 to the deflector 31. Examples of fixing methods include, but are not limited to, press-fitting, crimping, welding, bonding, and screwing.

[0093] Usage of closed type foam head 1

[0094] <Before installing the closed foam head 1> Before connecting the closed-type foam head 1 to the piping P of the foam fire extinguishing system, the closed-type foam head 1 is stored and transported to the construction site for installation. At this time, the closed-type foam head 1 includes a movable support member 40 that supports the foam generating unit 30 on the head body 10, allowing the foam generating unit 30 to move in the axial direction of the nozzle 11. Therefore, the foam generating unit 30 can be moved closer to the head body 10 by moving the movable support member 40. The state shown in Figure 3 is the state in which the foam generating unit 30 is closest to the head body 10 (close-mounted state, contracted state). In this way, the closed-type foam head 1 can be made smaller in size in the direction of the nozzle axis. In this state, the upper portion of the head 33c of the disk 33 can be recessed inside the umbrella-shaped disk housing portion 22h3 of the heat collector 22h. This also contributes to the miniaturization of the closed-type foam head 1. This reduces the storage space required for the closed-type foam head 1, reducing the packaging volume of the closed-type foam head 1 and contributing to reduced storage and transportation costs.

[0095] <When installing closed type foam head 1> The closed foam head 1 is connected to the piping P of the foam fire extinguishing equipment for each fire extinguishing area (see Figure 7). At this time, the closed foam head 1 can move the foam generation unit 30 away from the head body 10 by moving the movable support part 40. Figures 1 and 2 show the foam generation unit 30 in the farthest state (separate installation state, extended state). By connecting the closed foam head 1 to the fire extinguishing equipment piping P in this state, the foam generation unit 30 can be brought closer to the floor of the building. In other words, the foam generation unit 30 can be installed closer to the object to be extinguished, allowing the foam required for fire extinguishing to be efficiently sprayed.

[0096] <When the closed type foam head 1 is activated> A closed-type foam head 1 is installed for each fire extinguishing area, and each closed-type foam head 1 can sense the heat of a fire and activate. Specifically, the heat of the fire is transferred to the low-melting-point alloy 22f via the heat collector 22h and the cylinder 22d, softening and melting the low-melting-point alloy 22f. This decomposes the thermal decomposition unit 22, releasing the valve body 21 from the outlet 11b2 of the nozzle unit 11, and releasing the fire extinguishing liquid filled in the pipe P from the outlet 11b2. At this time, the components of the thermal decomposition unit 22 are repelled to the outside, but the head body 10 and the foam generating unit 30 are separated, forming a detachment gap 42 between them that serves as a path for the decomposed thermal decomposition unit 22 to fall off (Figure 7). The detachment gap 42 is the space between the head body 10 and the foam generating unit 30, excluding the guide pin 41. Therefore, the components of the thermal decomposition section 22 can fall out of the closed-type foam head 1 through the falling gap 42. This prevents the components from remaining in the foam generating section 30 from lodgement, and ensures that the extinguishing liquid is supplied to the foam generating section 30 to spray foam onto the object to be extinguished.

[0097] As mentioned above, closed foam heads 1 are installed in each fire extinguishing area, and when they detect the heat of a fire, they are activated, allowing fire extinguishing liquid to be sprayed locally in each fire extinguishing area where a fire has occurred. Therefore, closed foam heads 1 can reduce the amount of fire extinguishing liquid, especially foam extinguishing agents, used, resulting in fire extinguishing equipment that can contribute to reducing the environmental load.

[0098] Variations

[0099] In the above embodiment, the foam generating unit 30 is lowered to its lowest position when the closed-type foam head 1 is connected to the pipe P, but this is not limiting. For example, the installed state (upper position of the foam generating unit 30) may be a state in which the foam generating unit 30 houses the lower portion of the thermosensitive decomposition unit 22. In this case, a stopper is provided to prevent the guide pin 41 from descending, maintaining the upper position of the foam generating unit 30. For example, the stopper may be a locking protrusion on the guide pin 41 and a locking recess in the guide pin insertion hole 12b2. The locking protrusion and the locking recess are disengaged by the decomposition operation of the thermosensitive decomposition unit 22, allowing the foam generating unit 30 to descend. By maintaining the upper position of the foam generating unit 30, the overall length of the closed-type foam head 1 from the pipe P can be shortened, improving its appearance.

[0100] In the above embodiment, the heat collector 22h includes the first heat collector 22h1 and the second heat collector 22h2, but it may include only one of them, or may include a third heat collector. In that case, for example, it may include only the second heat collector 22h2 having the disk storage portion 22h3. [Explanation of symbols]

[0101] 1 Closed Foam Head 10 Head body 11 Nozzle section 12 Frame section 20 Closing part 21 Valve body 22 Thermal decomposition unit 30 Foam generation section 31 Deflector 32 Foam generating member 33 discs 40 Movable support part 41 Guide pin

Claims

1. a head body having a nozzle portion for supplying fire extinguishing liquid; a blocking section that blocks the outlet of the nozzle section when there is no fire and opens the outlet when it detects the heat of a fire; A foam generating unit including a deflector having a plurality of slits through which the extinguishing liquid can pass and a foam generating member having a mesh, and foaming and scattering the extinguishing liquid flowing from the outlet; a movable support part that supports the foam generating part on the head body in a state in which the foam generating part is movable in the axial direction of the nozzle part, Closed foam head.

2. The blocking section includes a heat-sensitive decomposition section that senses the heat of a fire and decomposes the fire. the movable support part separates the foam generating part from the head body, thereby forming a detachment gap between the head body and the foam generating part, which serves as a detachment path for the thermal decomposition part that has been activated to decompose.

10. The closed foam head of claim 1.

3. the movable support portion includes a guide pin holding portion and a guide pin, the guide pin holding portion has a guide pin insertion hole and is provided on the head body, the guide pin is fixed to the foam generating unit and held in the guide pin insertion hole in a state where it can move along the axial direction; 10. The closed foam head of claim 1.

4. The foam generating unit further includes a disk; The disk protrudes from the surface of the deflector toward the nozzle portion, and has a flat surface portion at its protruding end that scatters the fire-extinguishing liquid in a radial direction centered on the axial direction.

10. The closed foam head of claim 1.

5. The planar portion is a plane perpendicular to the axial direction.

5. The closed foam head of claim 4.

6. The disk has a side surface portion that forms a step between the flat surface portion and the deflector.

5. The closed foam head of claim 4.

7. the slits include a first slit having a length extending from an outer edge of the deflector to reach the disk; the first slit has a hole portion whose slit width is expanded at an end portion on the disk side; 5. The closed foam head of claim 4.

8. The head body further includes a frame portion, The frame portion has a plurality of protruding walls protruding from an outer position of the outlet toward the foam generating portion, and an opening provided between adjacent protruding walls for introducing foaming air into the fire extinguishing liquid discharged from the outlet.

10. The closed foam head of claim 1.

9. The foam generating member has a peripheral wall and a bottom, The bottom portion has an annular bulge portion bulging in a direction away from the deflector.

10. The closed foam head of claim 1.

10. The upper surface of the deflector is positioned lower than the upper edge of the foam generating member, The difference in height between the upper surface and the upper edge is between ½ and ¾ of the depth of the foam generating member.

10. The closed foam head of claim 1.

11. The outer diameter of the deflector is larger than the inner diameter of the head body.

10. The closed foam head of claim 1.

12. A foam fire extinguishing system comprising a closed foam head according to any one of claims 1 to 11.

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