sprinkler head

Abstract

The present invention provides a sprinkler head which makes it possible to increase the sprinkled water amount in the direction of installation of a pin that supports a deflector of the sprinkler head. The sprinkler head comprises: a body 1 which has a nozzle 11 that ejects a fire extinguishing liquid; a valve cap 3 which closes the nozzle 11; a thermosensitive operation part 4 which maintains the closed state of the valve cap 3 with respect to the nozzle 11, and which releases the closed state upon a decomposition operation; a disc-like deflector 21 which disperses the fire extinguishing ejected from the nozzle 11 outwardly in directions intersecting the axis of the nozzle 11; and a support column 22 which supports the deflector 21. On a surface 21a of the deflector 21 on the nozzle 11 side is a recessed part 26 which is formed from the periphery of the support column 22 and toward the outer edge 21b of the deflector 21, and which is more recessed than the surface 21a of the deflector 21 on the nozzle 11 side. Adjacent to the recessed part 26 on both sides in the width direction are first slits 27, the open ends 27c of which are provided adjacently to the outer edge 26b of the recessed part 26.

Description

[Technical Field]

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

[0002] Sprinkler heads automatically activate to spray water in the event of a fire. The nozzle is normally closed by a valve. The valve is supported at the bottom end of the body by a heat-sensitive actuator. The heat-sensitive actuator decomposes when the heat of the fire activates the heat-sensitive element built into the heat-sensitive actuator. The valve is pressed toward the nozzle by the heat-sensitive actuator, but the nozzle opens when the valve moves away from the nozzle. The water released from the nozzle collides with a plate-shaped deflector installed in the extension direction of the nozzle axis and is scattered in all directions, extinguishing the fire.

[0003] One example of the above sprinkler head is a flush-type sprinkler head. In a flush-type sprinkler head, the body that connects to the water supply pipe is embedded in the ceiling, and only the lower part of the heat-sensitive activation unit protrudes into the room from the ceiling surface. The deflector is housed inside the sprinkler head. In the event of a fire, the heat-sensitive activation unit disassembles and activates, and the deflector moves a certain distance toward the room. The deflector is connected to the body by multiple pins.

[0004] The water released from the nozzle collides with the center of the deflector, then flows radially and splashes off the edge of the deflector. At this time, the water flowing from the center of the deflector to the edge is blocked by the pins around the pins, which tends to reduce the amount of water sprayed in the direction of the pins.

[0005] Therefore, fewer pins will result in a more uniform watering pattern. However, fewer pins will require the pins to be thicker to ensure they are strong enough to withstand the force of the water flow. Therefore, as the pins get thicker, they have a greater effect on the water flow, making it more difficult to achieve a uniform watering pattern.

[0006] As one means for solving the above problem, Patent Document 1 describes a method of forming a recess around the pin of the deflector, with the bottom of the recess extending to the outer periphery of the deflector. In the sprinkler head of Patent Document 1, the amount of water flowing in the direction of the pin installation is ensured by guiding the water flow inside the recess. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Utility Model Application Publication No. 6-39030 Summary of the Invention [Problem to be solved by the invention]

[0008] The present disclosure aims to provide a sprinkler head that can increase the amount of water sprayed in the direction in which a pin that supports a deflector in the sprinkler head is installed. [Means for solving the problem]

[0009] In order to achieve the above object, the present disclosure provides the following sprinkler head. That is, one aspect of the present disclosure is a sprinkler head including: a body having a nozzle that discharges a fire-extinguishing liquid, a valve cap that closes the nozzle, a heat-sensitive operating unit that maintains the closed state of the valve cap relative to the nozzle and opens the closed state when disassembled, a disk-shaped deflector that scatters the fire-extinguishing liquid discharged from the nozzle outward in a direction intersecting the axis of the nozzle, and a support that supports the deflector, wherein the nozzle-side surface of the deflector has a recess that is formed from the periphery of the support toward the outer edge of the deflector so as to be recessed further than the nozzle-side surface of the deflector, and first slits whose open ends are provided adjacent to the outer edges of the recesses on both sides in the width direction of the recess.

[0010] According to one aspect of the present disclosure, the water flows into the recess and is rectified, causing a large amount of water to be scattered in a direction perpendicular to the outer edge of the recess, and the water scattered from the first slit is scattered along an extension of the imaginary line, thereby increasing the amount of water sprayed in the direction of the pin. [Effects of the Invention]

[0011] According to the present disclosure, the amount of water sprayed in the direction in which the pin supporting the deflector in the sprinkler head is arranged can be increased. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view of a sprinkler head of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 2 is a perspective view of a deflector unit. [Figure 4] FIG. [Figure 5] FIG. 4 is an enlarged view of the vicinity of the pin (support) in FIG. [Figure 6] FIG. [Figure 7] FIG. 3 is a diagram showing a state in FIG. 2 during water spraying. [Figure 8] FIG. 10 is an enlarged plan view of a modified deflector in the vicinity of a pin (support). [Figure 9] FIG. 10 is an enlarged plan view of the vicinity of a pin (support) of another modified example of the deflector. [Figure 10] FIG. 10 is an enlarged plan view of the vicinity of a pin (support) of yet another modified example of the deflector. DETAILED DESCRIPTION OF THE INVENTION

[0013] One aspect of the present disclosure will be described in detail below. However, the description is not intended to limit the scope of the present disclosure, and should be understood as a description explaining an exemplary embodiment. The following description does not unduly limit the scope of the claims, and not all of the configurations described in this embodiment are necessarily required as solutions.

[0014] In the following description, terms indicating directions such as "upper," "lower," "left," and "right" are used for convenience of explanation and do not limit the method or manner of use. Terms such as "first" and "nth" (n is an integer) following "first" in this specification and claims are used as identifying terms to distinguish different elements and do not indicate a particular order or superiority or inferiority.

[0015] The terms used in the following description are for the purpose of describing particular embodiments only and are not intended to limit the scope of the present disclosure. Elements according to an aspect described in the present specification and claims are intended to include the plural unless the context clearly dictates otherwise. The term "and / or" refers to and includes any and all possible combinations of one or more of the associated listed elements. The terms "includes," "including," "comprises," and / or "comprising" used in the present specification and claims specify the presence of features, operations, elements, or steps. However, they are not used as terms that exclude the presence or addition of one or more other features, operations, elements, steps, and / or groups thereof.

[0016] One embodiment of a "sprinkler head" of the present disclosure will be described with reference to Figures 1 to 7. The sprinkler head S has a body 1, a deflector unit 2, a valve cap 3, a heat-sensitive operating part 4, and a heat collector 5. The sprinkler head S of this embodiment is a flush-type sprinkler head in which the body 1, which connects to a water supply pipe, is embedded in a ceiling and installed.

[0017] The body 1 is hollow and cylindrical, and the interior thereof is a nozzle 11. The nozzle 11 is cylindrical and extends between one end and the other end of the body 1 in the cylindrical axis direction (height direction, up-down direction). In this specification and claims, the "axial direction" of the nozzle 11 is also referred to as the "cylindrical axis direction." A male thread 12 that connects to a water supply pipe P is provided at one end of the body 1. At the other end of the body 1, there is an outwardly extending flange 13, and a cylindrical frame 14 is threadably connected to the flange 13.

[0018] The frame 14 is installed on the outer periphery of the outlet end of the nozzle 11, and a step 15 extending inward is installed at the lower end inside the frame 14 (the end opposite the end of the frame 14 connected to the flange 13). A lever 41 of the heat-sensitive operating unit 4, which will be described later, is engaged with this step 15.

[0019] The deflector unit 2 of FIG. 3 includes a deflector 21, a pin 22 serving as a support, and a guide ring 23. The deflector unit 2 is housed inside a frame 14. The deflector 21 is disk-shaped and has a plurality of slits 24 on its periphery (outer edge). The slits 24 are arranged symmetrically with respect to an imaginary line Lx passing through the central axis of the pin 22 and the center of the deflector 21. The slits 24 have a tapered shape that widens from the center of the deflector 21 toward an open end 24a on the outer periphery (outer edge) side. The angle of the tapered shape is preferably 2 to 10 degrees. In this embodiment, the angle of the tapered shape is 5 degrees.

[0020] The deflector 21 has a hole (center hole) at its center that penetrates in the thickness direction (the cylindrical axial direction of the body 1), and the valve cap 3 is rotatably installed in this hole. The closed end 24b of the slit 24 on the center side of the deflector 21 is configured to overlap the outer edge of the valve cap 3.

[0021] A plurality of pins 22 are installed between the deflector 21 and the guide ring 23. The sprinkler head S of this embodiment has two pins 22. The pins 22 are inserted into holes 21c (pin insertion holes) formed near the periphery of the deflector 21 and penetrating the deflector 21 in its thickness direction (the cylindrical axis direction of the body 1). The pins 22 are also arranged adjacent to the outer edge 3a of the valve cap 3 installed on the deflector 21. One end (the guide ring side end) of the pins 22 is fixedly connected to the annular guide ring 23, and the other end (the deflector side end) of the pins 22 forms a flange 25. As a result, the deflector 21 is slidably held between the guide ring 23 and the flange 25.

[0022] The nozzle 11-side flat surface 21a of the deflector 21 has a recess 26 formed from around the hole 21c through which the pin 22 is inserted toward the outer edge 21b of the deflector 21, recessed toward the heat-sensitive actuation unit 4 relative to the nozzle 11-side flat surface 21a of the deflector 21. The step between the bottom surface 26f of the recess 26 and the flat surface 21a, which is the general surface of the deflector 21, forms a side wall 26a. Water (fire-extinguishing liquid) that flows into the recess 26 is rectified by the side wall 26a and scattered from the outer edge 26b of the recess 26. The step of the recess 26 functions to guide the fire-extinguishing liquid discharged from the nozzle 11 into the recess 26. Note that in the present embodiment, an example has been shown in which the bottom surface 26f of the recess 26 is recessed into the flat surface 21a of the deflector 21 and protrudes downward. However, the recess may also be formed, for example, by crushing the metal material forming the deflector 21. In this case, the thickness of the recess (bottom surface portion of the recess) in the thickness direction of the deflector 21 is formed to be thinner than the thickness of the peripheral portion of the recess.

[0023] The outer edge 26b of the recess 26 is linear and located inside the imaginary outer circumferential circle of the deflector 21, which is shown by the dashed line in FIG. 5 . Therefore, a large amount of water is scattered in a direction perpendicular to the linear outer edge 26b. Furthermore, because the linear outer edge 26b of the recess 26 is located inside the imaginary outer circumferential circle of the deflector 21, the distance that water scattered from the recess 26 travels is shorter than the distance that water scattered from the outer edge of the deflector 21. Therefore, water can be scattered over a short distance from the location where the sprinkler head S is installed. Meanwhile, the inner edge 26d of the recess 26 is located so as to overlap the outer edge 3a of the valve cap 3. In this embodiment, the outer edge 26b of the recess 26 is linear; however, the shape of the outer edge 26b is not limited to a linear shape as long as the outer edge 26b is located inside the imaginary outer circumferential circle of the deflector 21.

[0024] 5, the width W of the recess 26 is preferably set to 1.2 to 1.5 times the diameter D of the pin 22. In this embodiment, it is set to about 1.3 times. This forms a narrowed portion 26e between the pin 22 and the side wall 26a of the recess 26, thereby improving the flow rate of water passing through the narrowed portion 26e.

[0025] First slits 27 are provided on both sides of the recess 26 in the width direction. As shown in FIG. 5, the first slits 27 have open ends 27c adjacent to the outer edge 26b of the recess 26. Each first slit 27 has a first side 27a located on the pin 22 side and a second side 27b facing the first side 27a. The first side 27a is formed along the side wall 26a of the adjacent recess 26 and is formed parallel to the imaginary line Lx. On the other hand, the second side 27b is formed so as to approach the first side 27a from the closed end side toward the open end side of the first slit 27. That is, the second side 27b is inclined with respect to the imaginary line Lx, and is formed so that the second side 27b intersects with the imaginary line Lx when extended in the direction of the open end 27c of the first slit 27.

[0026] That is, the second sides 27b of each first slit 27 are inclined with respect to the imaginary line Lx so that extending the second sides 27b toward the open ends 27c of the first slits 27 intersects with the imaginary line Lx. Therefore, the width of the first slits 27 narrows toward the outer edge of the deflector 21, thereby improving the flow rate of the water that flows in and causing the water that splashes from the first slits 27 to splash in the direction of the pins 22 along the extension of the imaginary line Lx. Furthermore, in this embodiment, the first slits 27 are provided on both sides of the recess 26 in the width direction, so that the amount of water sprayed in the direction of the pins 22 can be increased.

[0027] Water that flows into first slit 27 flows along second side 27b and then flows in a direction perpendicular to the line connecting open ends 27c, so that it flows toward an extension of imaginary line Lx on the back of pin 22. Furthermore, if the corner between outer edge 26b of recess 26 and first slit 27 is cut diagonally to provide inclined surface 26c, the water flowing through first slit 27 will be urged by inclined surface 26c toward imaginary line Lx.

[0028] As shown in Fig. 5, the closed end 27d of the first slit 27 is disposed away from the outer edge 3a of the valve cap 3. To explain in more detail, the length L1 from the orthogonal virtual line Ly, which is obtained by rotating the virtual line Lx by 90 degrees with the center of the deflector 21 as the origin, to the outer periphery of the pin 22, and the length L2 from the orthogonal virtual line Ly to the closed end of the first slit 27 are configured to be approximately equal. If the first slit 27 is shallow and the relationship of length L1 < length L2 holds, water will be sprayed at a position far from the head in the back direction of the pin 22. On the other hand, if the first slit 27 is deep and the relationship of length L1 > The relationship between length L2 and become In this case, water will be sprayed at a position too close to the head on the back side of the pin 22. For this reason, in this embodiment, in order to make it easier to spray water at a desired and suitable position that is reasonably close to the head on the back side of the pin 22, the length L1 is configured to be approximately equal to the length L2.

[0029] As described above, one end of the pin 22 is fixedly connected to the guide ring 23. The outer diameter of the guide ring 23 is smaller than the inner diameter of the frame 14 and larger than the inner diameter of the step 15. Therefore, the guide ring 23 is configured to be locked onto the step 15 after it falls off due to the operation of the heat-sensitive operation unit 4.

[0030] An arm 23a is provided on the outer edge of the guide ring 23. The arm 23a is provided parallel to the pin 22 and is disposed adjacent to the pin 22. More specifically, the arm 23a is disposed on an imaginary plane (not shown) where the imaginary line Lx and the axis of the nozzle 11 intersect. The length of the arm 23a is shorter than the length of the pin 22. The arm 23a is housed in a groove 15a formed in a step 15 of the frame 14. The groove 15a is parallel to the axis of the nozzle 11 and acts as a guide when the guide ring 23 slides within the frame 14.

[0031] Furthermore, when the nozzle 11 is open and discharging water, the side of the arm 23a is held by the groove 15a. As a result, even if the water flow is unstable, the flat surface 21a of the deflector 21 is perpendicular to the central axis of the nozzle 11, preventing the deflector 21 from vibrating. Furthermore, because the arm 23a is housed in the groove 15a, the guide ring 23 and the deflector 21 are prevented from moving in the circumferential direction. As shown in FIG. 2, the groove 15a is located at a position rotated 90° around the axis of the nozzle 11 from the position where the lever 41 engages with the step 15.

[0032] The valve cap 3 is formed in a disk shape with a protrusion on the nozzle 11 side. A plate-shaped saddle 31 is provided between the valve cap 3 and the lever 41. The valve cap 3 closes the outlet end of the nozzle 11 by the lever 41 engaging with the step 15 and being pressed via the saddle 31, thereby being held at the outlet position of the nozzle 11.

[0033] A seal member 32 is installed between the valve cap 3 and the outlet end of the nozzle 11. The seal member 32 is made of, for example, a fluororesin. In this embodiment, the seal member 32 is installed at the outlet end of the nozzle 11, but the seal member 32 may also be installed on the valve cap 3. In this state, the deflector 21, with the valve cap 3 mounted thereon, is disposed within the frame 14 in close proximity to the guide ring 23. A spring 33 is installed between the guide ring 23 and the flange 13 and biased thereto. When the heat-sensitive actuation unit 4 is activated, the spring 33 urges the guide ring 23, the deflector 21, and the valve cap 3 to move outward from the frame 14. The load of the spring 33 is lower than the load pressing the valve cap 3 against the outlet end of the nozzle 11.

[0034] 2 and 3, the valve cap 3 has an annular flat portion 34a that contacts the outlet end of the nozzle 11, an inner convex portion 34b that is provided inside the flat portion 34a and protrudes toward the interior of the nozzle 11, and an outer convex portion 34c that protrudes in the opposite direction from the inner convex portion 34b. A slope 34d is formed on the outer edge of the flat portion 34a from the surface on the inner convex portion 34b side toward the outer edge. The shapes of the flat portion 34a, the inner convex portion 34b, and the slope 34d affect the water spray pattern because water discharged from the nozzle 11 collides with and flows over these surfaces when the sprinkler head is activated.

[0035] The outer edge 3a of the valve cap 3 is positioned so as to overlap the inner edge 26d of the recess 26. This causes water to flow down the inclined surface 34d of the valve cap 3 and into the recess 26 without reducing its momentum. The outer edge 3a of the valve cap 3 is also positioned so as to overlap the closed end 24b of the slit 24, so that the water flowing down the inclined surface 34d of the valve cap 3 is splashed downward from the slit 24 while maintaining its momentum.

[0036] In this embodiment, the pin 22 is disposed adjacent to the outer edge 3a of the valve cap 3. Specifically, when the heat-sensitive actuation unit 4 is actuated, the deflector 21 slides along the pin 22, and the outer edge 3a of the valve cap 3 and the pin 22 are disposed adjacent to each other with a slight gap between the valve cap 3 and the pin 22. By disposing the pin 22 adjacent to the outer edge 3a of the valve cap 3 in this manner, the water released from the nozzle 11 flows directly from the valve cap 3 into the recess 26 in which the pin 22 is disposed, and is scattered from the outer edge 26b of the recess 26 while maintaining its momentum.

[0037] 1, 2, and 6 includes a pair of levers 41, a support plate 42, a balancer 43, a set screw 44, a cylinder 45, a plunger 46, and a fusible alloy 47. Publicly known components of the heat-sensitive actuation unit 4 are described in, for example, JP 2005-27929 A.

[0038] Cylinder 45 is formed in a cylindrical shape with a bottom, and a male screw protrudes from the bottom. Cylinder 45 is filled with a fusible alloy 47, and a plunger 46 is placed on top of fusible alloy 47, i.e., on the side opposite the bottom of cylinder 45. These components form the heat-sensitive element of heat-sensitive operating unit 4. As shown in Figures 1 and 2, a heat collector 5 is connected to the male screw. As a result, heat collector 5 is held in body 1 so as to protrude from the lower end of body 1.

[0039] The heat collector 5 is bowl-shaped with a nut 51 attached to its center. The nut 51 is threaded onto the male thread 45a of the cylinder 45. The nut 51 is formed with a larger diameter at the end on the heat collector 5 side and a smaller diameter at the end on the cylinder 45 side. This forms a step 54 in the middle of the nut 51. After the nut 51 is connected to the cylinder 45, adhesive poured into the threaded joint between the nut 51 and the male thread 45a hardens.

[0040] The end of the nut 51 on the heat collector 5 side is in direct contact with the bottom surface of the cylinder 45. The end of the nut 51 on the heat collector 5 side has a larger diameter than the end on the cylinder 45 side. This increases the contact area between the heat collector 5 and the nut 51, resulting in stable joint strength between the heat collector 5 and the nut 51. Furthermore, because the contact area between the heat collector 5 and the nut 51 is larger than the end on the cylinder side, the heat absorbed by the heat collector 5 can be efficiently transferred to the nut 51.

[0041] The outer diameter of the end of the nut 51 is configured to be equal to or smaller than the diameter of the bottom surface of the cylinder 45. More preferably, the outer diameter of the end of the nut 51 is configured to be equal to or smaller than the inner diameter of the cylinder 45. By doing so, the heat absorbed by the heat collector 5 is transferred to the fusible alloy 47 via the nut 51 and the bottom surface of the cylinder 45 without passing through, for example, the side surface of the cylinder 45, thereby reducing loss during heat transfer.

[0042] The heat collector 5 has multiple openings 55 formed on its side surface. The openings 55 are arranged around the entire side surface of the heat collector 5 at equal lengths and intervals. In the embodiment shown in FIG. 1, six openings 55 are provided. The number of openings 55 is greater than the number of levers 41. By making the openings 55 large enough, the efficiency of airflow passing through the heat collector 5 can be improved. Specifically, the height of the openings 55 is 2 to 5 mm, and the width of the openings 55 is 8 to 12 mm. With this configuration, air heated by a fire flows into the heat collector 5 through the openings 55, allowing the heat collector 5 to absorb heat from the inside as well.

[0043] The escutcheon E is configured to have a dish portion E1 that covers the hole H between the ceiling C and the sprinkler head S, and a tubular portion E2 that extends from the inner edge of the dish portion E1 and engages with the frame 14. The dish portion E1 is configured so that the outer peripheral edge that extends outward from the lower end of the tubular portion E2 can come into contact with the ceiling surface C1.

[0044] Next, the operation process of the sprinkler head S according to one embodiment of the present disclosure in the event of a fire will be described.

[0045] As shown in Figure 1, the sprinkler head S is installed with its body 1 screw-connected to the water supply pipe P and its heat collector 5 exposed to the room's interior from the ceiling C. A hole H is formed in the ceiling C so that the sprinkler head S can be inserted into the room, and an escutcheon E is installed to cover the hole H.

[0046] When a fire breaks out, the heat of the fire warms the air in the room, creating an updraft, and the heated air accumulates under the ceiling C. The air, driven by this updraft, flows along the dish portion E1 of the escutcheon E and into the gap E3 located between the cylindrical portion E2 and the heat collector 5. The air then passes through the opening 55 and reaches the inside of the heat collector 5. The heat of this airflow is absorbed by the surfaces of the heat collector 5, the nut 51, and the cylinder 45, and is transferred to the fusible alloy 47, promoting its melting.

[0047] When the fusible alloy 47 melts, the plunger 46 moves toward the bottom of the cylinder 45, loosening the engagement between the balancer 43 and the lever 41, causing the lower end of the lever 41 to rotate and disengage from the balancer 43. The lever 41 rotates further and falls off the step 15 of the frame 14. Furthermore, the saddle 31 and the valve cap 3 that were placed on the lever 41 also fall off the outside of the frame 14.

[0048] The deflector unit 2, into which the valve cap 3 is assembled, slides within the frame 14 toward the step 15 due to the action of the spring 33 so that the outer edge of the guide ring 23 engages with the step 15. The deflector 21 and valve cap 3 move downward in the drawing along the pin 22 and are locked onto the flange 25. As a result, the deflector 21 and valve cap 3 are suspended below the frame 14 by the pin 22. When the valve cap 3 moves away from the outlet end of the nozzle 11, water in the water supply pipe P is released from the nozzle 11 and hits the valve cap 3 and the deflector 21.

[0049] Water that strikes the valve cap 3 flows along its surface, passes through the surface of the deflector 21, and is then scattered onto the floor. Water flowing around the pin 22 flows from the slope 34d on the outer edge 3a side of the valve cap 3 into the recess 26 without passing through the surface of the deflector 21. As the water that flows into the recess 26 passes through the narrowed portion 26e between the pin 22 and the side wall 26a of the recess 26, its flow velocity increases and it is straightened by the side wall 26a, and it is scattered from the outer edge 26b of the recess 26. At this time, the water is scattered in a direction perpendicular to the linear outer edge 26b of the recess 26, and its flying distance is closer to the sprinkler head S than water scattered from the outer edge 21b of the deflector 21. Furthermore, the water that passes through the first slit 27 adjacent to the recess 26 increases its flow velocity and flows along the extension of the imaginary line Lx, increasing the amount of water sprayed behind the pin 22.

[0050] As described above, in this embodiment, recesses 26 are provided from the periphery of pins 22 toward outer edge 21b of deflector 21, and first slits 27 are provided on both sides of recesses 26 in the width direction. By configuring deflector 21 in this manner, it is possible to increase the amount of water sprayed in the direction in which pins 22 are arranged. In particular, the narrower the spacing between first slits 27, the smaller the angle at which sprayed water is divided to the left and right of pins 22, and the more water sprayed in the direction of pins 22. For this reason, in this embodiment, the width of recesses 26 is narrowed as much as possible, and first slits 27 are placed close to each other.

[0051] Meanwhile, water flowing from valve cap 3 into slit 24 is sprayed onto the floor surface in a range close to the position where sprinkler head S is installed. As described above, slit 24 has a tapered shape that widens toward open end 24a, so that water flowing into slit 24 is sprayed while spreading along the taper. This increases the amount of water sprayed in a range close to sprinkler head S, and also provides a spray pattern with reduced bias in the amount of water sprayed. Meanwhile, water sprayed onto the floor surface from outer edge 21b of deflector 21 is sprayed onto the floor surface in a range far from the position where sprinkler head S is installed.

[0052] As a result, the water that hits the deflector 21 is scattered evenly in all directions onto the floor surface, thereby suppressing and extinguishing the fire.

[0053] The following describes the advantages of the present disclosure that have not been described above.

[0054] The slit 24 is positioned so that its closed end 24b overlaps the outer edge 3a of the valve cap 3, and water flowing over the surface of the valve cap 3 flows directly into the slit 24 from the slope 34d. Furthermore, the greater the height dimension of the inner convex portion 34b of the valve cap 3, the closer the water scattering from the slit 24 is to a position from the sprinkler head S. The height dimension from the back surface of the flat portion 34a facing the deflector 21 to the flat portion 34a is preferably 2 to 3 times, and in this embodiment is configured to be 2.5 to 2.8 times.

[0055] Furthermore, the water scattered from outer edge 26b of recess 26 is sprayed at a position close to sprinkler head S because outer edge 26b is positioned inside the imaginary outer circumferential circle of deflector 21. On the other hand, if outer edge 26b is positioned closer to the outer circumferential diameter of deflector 21, water can be sprayed at a position farther away.

[0056] By combining the configurations described above, the amount of water sprayed at a position close to the sprinkler head S can be increased.

[0057] The shape of the deflector of the sprinkler head is not limited to the above-described embodiments shown in Figures 3 to 5. That is, any configuration is acceptable as long as it has a recess formed from around the pin on the nozzle side surface of the deflector toward the outer edge of the deflector, recessed more than the nozzle side surface of the deflector, first slits are provided on both sides of the recess in the width direction, and the open ends of the first slits are provided adjacent to the outer edge of the recess.

[0058] 8, the first side 27a of the first slit 27 may be configured to be parallel to the second side 27b, the first side 27a being inclined with respect to the imaginary line Lx, and the first side 27a intersecting with the imaginary line Lx when extended in the direction of the open end 27c. Even if the first side 27a is configured to be inclined with respect to the imaginary line Lx, the amount of water sprayed in the direction in which the pin 22 is disposed can be increased as long as the first slit 27 is positioned so that the open end 27c is adjacent to the recess 26 in the width direction.

[0059] 9, the second side 27b of the first slit 27 may be arranged in parallel to the first side 27a and in a direction parallel to the imaginary line Lx. Even in this configuration in which the second side 27b is arranged in a direction parallel to the imaginary line Lx, the amount of water sprayed in the direction in which the pin 22 is arranged can be increased as long as the position of the open end 27c of the first slit 27 is adjacent to the recess 26 in the width direction.

[0060] 10, the outer edge 26b of the recess 26 may be positioned slightly outside the imaginary outer periphery of the deflector 21. Even if the outer edge 26b of the recess 26 is positioned slightly outside the imaginary outer periphery of the deflector 21, the amount of water sprayed in the direction in which the pin 22 is disposed can be increased as long as the open ends 27c of the first slits 27 are positioned adjacent to each other in the width direction of the recess 26.

[0061] Although each embodiment of the present disclosure has been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the novel features and effects of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure.

[0062] For example, a term described at least once in the specification or drawings together with a different term having a broader or similar meaning can be replaced with that different term anywhere in the specification or drawings. Furthermore, the configurations and operations of the sprinkler head and deflector are not limited to those described in the embodiments of the present disclosure, and various modifications are possible. [Explanation of symbols]

[0063] 1 body, 2 deflector unit, 3 valve cap, 3a outer edge (of valve cap), 4 heat-sensitive operating part, 5 heat collector, 11 nozzle, 14 frame, 15 step, 21 deflector, 21a flat surface (surface on the nozzle side), 21b outer edge (of deflector), 21c hole (pin insertion hole), 22 pin (support), 23 guide ring, 24 slit, 24a open end (of slit), 24b closed end (of slit), 25 flange, 26 recess, 26a side wall, 26b outer edge (of recess), 26c inclined surface, 26d inner edge (of recess), 26e narrowed portion, 26f bottom surface, 27 first slit, 27a first edge, 27b second edge, 27c open end (of first slit), 27d closed end (of first slit), 31 Saddle, 32 sealing member, 33 spring, 34a (of valve cap) flat portion, 34b (of valve cap) inner convex portion, 34c (of valve cap) outer convex portion, 34d (of valve cap) inclined surface, 41 lever, 42 support plate, 43 balancer, 44 set screw, 45 cylinder, 45a male thread, 46 plunger, 47 fusible alloy, 51 nut, 54 step, 55 opening, S sprinkler head

Claims

1. a body having a nozzle for discharging a fire extinguishing liquid; a valve cap that closes the nozzle; a heat-sensitive operating unit that maintains the valve cap in a closed state relative to the nozzle and opens the closed state during a disassembly operation; a disk-shaped deflector having a plurality of plate pieces and a plurality of slits alternately formed in a circumferential direction, and scattering the fire-extinguishing liquid discharged from the nozzle outward in a direction intersecting the axis of the nozzle; a support for supporting the deflector, the plurality of plate pieces includes a first plate piece on which the support post is disposed, a recess formed on a surface of the first plate piece facing the nozzle of the deflector from a periphery of the support pillar toward an outer edge of the deflector, the recess being recessed from the surface of the first plate piece facing the nozzle of the deflector; a first slit, the open end of which is provided adjacent to an outer edge of the recess, on both sides of the recess in the width direction; The corner between the outer edge of the recess in the first plate piece and the first slit is notched obliquely. Sprinkler head.

2. The width of the first slit narrows from the center side of the deflector toward the outer edge side. The sprinkler head of claim 1.

3. the first slit has a first side located on the support column side and a second side opposite to the first side, the first side is formed along a side wall of the adjacent recess, The second side is formed so as to approach the first side from the closed end side toward the open end side of the first slit. The sprinkler head of claim 1.

4. The support pillar is disposed adjacent to the outer edge of the valve cap mounted on the deflector. The sprinkler head according to any one of claims 1 to 3.

5. The outer edge of the recess is disposed inside the imaginary outer circumferential circle of the deflector. The sprinkler head according to any one of claims 1 to 4.

6. The outer edge of the recess is formed in a straight line. The sprinkler head according to any one of claims 1 to 5.

7. The outer edge of the valve cap is positioned to overlap the inner edge of the recess. The sprinkler head according to any one of claims 1 to 6.

8. The width of the recess is set to 1.2 to 1.5 times the diameter of the support. The sprinkler head according to any one of claims 1 to 7.

9. A plurality of linear slits are formed on the outer edge of the deflector, and the width of the slits tapers toward the open end on the outer periphery of the deflector. A sprinkler head according to any one of claims 1 to 8.

10. The slit is disposed so that the closed end of the deflector on the center side and the outer edge of the valve cap overlap with each other.

10. The sprinkler head of claim 9.

11. A plurality of the support columns are installed between the deflector and the guide ring, and the guide ring is slidable within a cylindrical frame installed on the outer periphery of the outlet end of the nozzle and is engaged with a step installed at the lower end inside the frame. The sprinkler head according to any one of claims 1 to 10.

12. An arm is installed on the outer edge of the guide ring in parallel with the support pillar. The sprinkler head of claim 11.

13. The arm is disposed within a groove formed in the step and parallel to the axis of the nozzle.

13. The sprinkler head of claim 12.

14. The outer surface of the support on the center side of the deflector is arranged to overlap the outer edge of the valve cap. A sprinkler head according to any one of claims 1 to 13.

15. The support is located in the recess closer to the valve cap than the closed end of the deflector on the center side of the first slit. A sprinkler head according to any one of claims 1 to 14.

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