JP2019187774A - Sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sprinkler head with improved operation reliability, in which components housed inside a frame can be discharged to the outside without being caught in the frame during the process of operating the sprinkler head. A valve body (3) has a recess (32) as a recess into which a head (64B) of a set screw (64) is inserted. The recess 32 has an opening 32c on the side where the head 64B is inserted, and an abutting portion 32a with which the head 64B inserted through the opening 32c can abut. The inner peripheral surface of the recess 32 is wider in the gap with the head portion 64B on the opening 32c side than with the gap with the head portion 64B on the contact portion 32a side. [Selection diagram] Fig. 3

Description

The present invention relates to a fire extinguishing sprinkler head.

  The sprinkler head automatically activates in the event of a fire and sprays water as a fire extinguishing liquid. For this reason, a sprinkler head is provided with the nozzle connected to the water supply piping, and the thermal decomposition part which act | operates with the heat of a fire. During normal times without fire, the outlet of the nozzle is closed by a valve body. A load for closing the outlet of the nozzle is applied to the valve body via the thermal decomposition section. Further, a disc spring is installed between the valve body and the thermal decomposition unit, and the disc spring presses the valve body in a direction to close the outlet of the nozzle.

  As such a sprinkler head, one using a ball or a ring for a thermal decomposition part is known (for example, see Patent Document 1). In these sprinkler heads, the amount of movement of the components of the thermal decomposition unit necessary for spraying water after the thermal decomposition unit is activated is set large. Therefore, for example, even when an external force is received during normal times, the load that the valve element closes the outlet of the nozzle is unlikely to decrease, and the shock resistance is excellent.

  When the sprinkler head is subjected to an external force during normal times, a slight displacement may occur in the components of the thermal decomposition unit. However, such slight misalignment is less than the amount of component movement required for the sprinkler head to operate and sprinkle, so the sprinkler head does not operate. On the other hand, when the low melting point alloy is melted due to a fire, a plurality of balls are detached from the stepped portion of the frame, so that the balance supporting the thermal decomposition portion is lost. As a result, the thermal decomposition portion cannot be held at the stepped portion of the frame, and the valve body is opened by dropping the thermal decomposition portion from the frame, leading to the operation of the sprinkler head.

  In addition, in order to maintain the closed state of the valve body with respect to the nozzle end, which is the outlet of the nozzle, from the melting of the low melting point alloy until the thermal decomposition part falls off, a valve is provided between the thermal decomposition part and the valve body. A disc spring is installed to urge the body toward the nozzle end. This disc spring has a valve against the thermal decomposition unit according to the amount of deflection (displacement) until the flat plate spring is restored to a mountain shape when the components of the thermal decomposition unit start to move. The body continues to be urged toward the nozzle end.

JP2012-105952A, FIG.

  By the way, in the sprinkler head of Patent Document 1 as described above, a disc spring is inserted through a set screw provided in the thermal decomposition section, and a load (biasing force) of the disc spring is applied to the bottom surface of the valve body. . The thermal decomposition unit may be decomposed while being tilted with respect to the central axis of the nozzle, for example, when the part where solder starts to melt varies depending on the dimensional error or assembly error of the parts, or the position of the fire source. If the set screw tilts at that time, there is a possibility that a lodgement may occur. That is, the center axis of the disc spring is decentered with respect to the center axis of the frame, which may cause the edge of the disc spring to be hooked inside the cylindrical frame. In addition, if the set screw is tilted during disassembly, the deflector and the guide link connected to the deflector may slide inside the frame while tilting. In this case, the deflector and the guide ring may be caught inside the frame. It may be moored and lodgement may occur.

  The present invention has been made against the background of the prior art as described above. An object of the present invention is to increase the operational reliability of a sprinkler head.

  In order to achieve the above object, the sprinkler head of the present invention is configured as follows.

  That is, the present invention includes a main body having a nozzle therein, a valve body that closes the outlet of the nozzle, and a thermal decomposition section that maintains the valve body closing the outlet and that is decomposed by melting a low-melting-point alloy. And a disc spring member that urges the valve body against the outlet, and a set screw through which the disc spring member is inserted, and the valve body is a head on one end side of the set screw. A sprinkler head having an opening on the side where the head is inserted, and a contact portion with which the head inserted from the opening can come into contact. The inner peripheral surface of the recess is formed such that a gap with the head on the opening side is wider than a gap with the head on the contact part side.

  According to the present invention, the shape of the inner peripheral surface of the concave portion of the valve body is such that a gap is formed between the head of the set screw. More specifically, the inner peripheral surface of the recess is shaped so that the gap with the head on the opening side of the recess is wider than the gap with the head on the contact portion side of the recess. Yes. Therefore, at the initial operation of the disassembly operation of the thermal decomposition unit in which the valve body opens the nozzle, the head of the set screw has entered deeply into the recess, and the gap between the inner peripheral surface of the recess and the head is on the contact portion side of the recess. narrow. For this reason, even if the set screw tends to tilt greatly with the decomposition operation of the thermal decomposition portion, the head of the set screw moves through a slight gap and comes into contact with the inner peripheral surface on the contact portion side of the recess. Thus, excessive tilting of the set screw at the initial operation of the disassembly operation can be restricted. After that, the gap between the inner peripheral surface on the opening side of the recess and the head of the set screw widens, so when the head of the set screw comes out of the recess by the decomposition operation of the thermal decomposition part, The thermal decomposition part can be smoothly decomposed and operated without the head being caught by the inner peripheral surface on the opening side of the recess. As described above, according to the present invention, excessive tilting of the set screw at the initial operation of the decomposition operation of the thermal decomposition unit can be controlled, and thereafter the opening of the recess until the head of the set screw is removed from the recess. Since it is not caught by the inner peripheral surface on the side, it can be smoothly removed from the recess. Therefore, the occurrence of lodgement can be prevented and the operational reliability of the sprinkler head can be enhanced.

  The inner peripheral surface of the concave portion is configured to have a tilt restricting portion on the abutting portion side, the tilt restricting portion for restricting excessive tilting of the thermosensitive decomposing portion by contacting the head when the thermosensitive decomposing portion is disassembled. can do. According to the present invention, the tilt restricting portion provided on the inner peripheral surface of the concave portion on the contact portion side contacts the head of the set screw to restrict excessive tilt. For this reason, it can suppress more reliably that the center axis | shaft of a set screw inclines with respect to the center axis | shaft of a valve body at the time of initial action of decomposition | disassembly operation | movement.

  The inner peripheral surface of the concave portion of the present invention can be formed such that the gap with the head on the opening side is wider than the gap with the head on the contact portion side. However, this can be configured in various ways. As a specific example thereof, the inner peripheral surface of the recess can be configured as a tapered shape whose diameter increases from the contact portion side toward the opening portion side. According to the present invention, in the closed state in which the valve body closes the nozzle, the central axis of the set screw can be arranged coaxially with the central axis of the valve body, and the set screw comes out of the recess during the disassembly operation. On the other hand, by gradually allowing the tilt, the set screw can be smoothly disassembled while suppressing an excessive tilt of the set screw.

  The said opening part can be comprised so that it may have a slope part diameter-expanded at an acute angle with respect to the said internal peripheral surface. According to the present invention, a large gap is formed between the inclined surface portion, the head portion of the set screw, and the inclined surface portion when the set screw comes out of the concave portion of the valve body by the disassembling operation. It is possible to reliably prevent the portion from being caught in the recess, and to smoothly disassemble the heat-sensitive decomposition portion.

  The present invention includes a guide ring having a claw erected along the outer peripheral surface of the nozzle, and a deflector connected to the guide ring by a pin, and the outer peripheral surface of the outlet of the nozzle Can be configured to have a tapered portion that tapers toward the outlet side. According to the present invention, since the tapered portion is formed on the outer peripheral surface of the nozzle outlet, the guide ring claw is caught when the guide ring claw moves along the outer peripheral surface of the nozzle during the disassembling operation. This can prevent the lodgement from occurring.

  The disc spring member can be configured as a combination disc spring in which a main disc spring and an auxiliary disc spring having a smaller amount of deflection due to deflection deformation than the main disc spring are stacked. The main disc spring has a large deflection amount due to deflection deformation, and the auxiliary disc spring has a deflection amount that complements the deflection amount due to deflection deformation of the main disc spring. As a result, the amount of deflection of the main disc spring can be supplemented by the amount of deflection of the auxiliary disc spring, so that the components of the thermal decomposition unit can be moved during the disassembly operation without increasing the height and outer diameter of the main disc spring. Can be absorbed by a larger deflection amount of the main disc spring and the auxiliary disc spring.

  The height of the head of the set screw can be configured to be equal to or greater than the amount of deflection deformation of the disc spring member. As a result, even when the disc spring member is restored to the height at the time of no load, the state of being inserted through the set screw can be maintained. Therefore, since the disc spring member can be dropped together with the thermal decomposition portion at the time of the disassembling operation, it is possible to prevent the occurrence of a lodgement due to the disc spring member dropping alone.

  According to the sprinkler head of the present invention, the occurrence of lodgement can be suppressed and the operation reliability during the disassembly operation can be improved.

1 is a cross-sectional view of a sprinkler head according to an embodiment of the present invention. The perspective view of the watering part with which the sprinkler head of FIG. 1 is equipped. Sectional drawing of the watering part shown in FIG. It is a figure which shows the main disc spring with which the sprinkler head of FIG. 1 is equipped, FIG. 4A is a top view, FIG. 4B is a perspective view, FIG. 4C is sectional drawing. It is a figure which shows the auxiliary | assistant disk spring with which the sprinkler head of FIG. 1 is equipped, FIG. 5A is a top view, FIG. 5B is sectional drawing. FIG. 2 is an enlarged cross-sectional view around a cylinder of the sprinkler head of FIG. 1. Sectional drawing which shows the action | operation process of the sprinkler head of FIG. Sectional drawing which shows the modification of the recessed part of the valve body in the sprinkler head of FIG. Sectional drawing of the watering part with which the sprinkler head of FIG. 8 is equipped.

  An embodiment of the sprinkler head S of the present invention will be described with reference to the drawings. The sprinkler head S includes a main body 1, a frame 2, a valve body 3, a water spray unit 4, a combination disc spring 5 (disc spring member), and a heat-sensitive decomposition unit 6.

  The main body 1 is formed in a cylindrical shape, and a nozzle 11 is formed therein. A screw portion 12 connected to a water supply pipe (not shown) is provided on the upper end side of the outer periphery of the main body 1, a nozzle 11 extends on the inner surface side, and an “exit” of the nozzle 11 on the lower end thereof. Nozzle end 11a is formed. The nozzle end 11a is in contact with the valve body 3, and is closed by the valve body 3 in normal times (closed state). A flange portion 1 a protrudes from an intermediate portion of the outer periphery of the main body 1, and a screw portion 13 connected to the frame 2 is formed at an inner edge portion of the flange portion 1 a. A tapered portion 11 b is formed on the outer peripheral surface on the outlet side of the nozzle 11. The tapered portion 11b has a shape that tapers toward the nozzle end 11a. As a result, it is possible to prevent the later-described guide ring 42 from being caught.

  The frame 2 is formed in a cylindrical shape, and a screw portion 21 is provided at an upper end thereof and is screwed and connected to the screw portion 13 of the main body 1 described above. An annular step portion 22 that protrudes inward is formed on the inner periphery of the lower end of the frame 2, and a ball 61 described later is engaged with the step portion 22. The frame 2 is arranged so as to surround the outer periphery on the outlet side of the nozzle 11.

  The valve body 3 is formed in a disk shape, and closes the nozzle end 11a by contacting the nozzle end 11a. A protrusion 31 that enters the inside of the nozzle 11 is formed on the surface of the valve body 3 that faces the nozzle 11. A recess 32 as a “recess” is formed on the opposite surface. A set screw 64 described later is inserted into the recess 32.

  As shown in FIG. 3, the dent 32 includes an abutting portion 32 a on which the tip of the head portion 64 B of the set screw 64 can abut, and an inner peripheral surface 32 b that faces the outer peripheral surface of the head portion 64 B of the set screw 64. And an opening 32c serving as an insertion side end of the set screw 64. The inner peripheral surface 32b of the dent 32 is formed in a taper shape whose diameter increases from the contact portion 32a side toward the opening portion 32c side. Therefore, the gap between the inner peripheral surface 32b and the outer peripheral surface of the head 64B of the set screw 64 increases as it goes from the contact portion 32a side to the opening portion 32c side. As a result, it is possible to suppress the occurrence of lodgement by suppressing the set screw 64 from being excessively inclined during the initial movement of the disassembling operation. Further, as the head 64B of the set screw 64 is displaced so as to come out of the recess 32, the head 64B can be smoothly removed from the recess 32 because it is not caught with the inner peripheral surface 32b.

  On the inner peripheral surface 32b, a tilt restricting portion 32b1 is formed so as to face the outer peripheral surface of the head 64B of the set screw 64. The tilt restricting portion 32b1 can abut against the head 64B of the set screw 64 and restrict excessive tilting. For this reason, it can suppress more reliably that the center axis | shaft of the set screw 64 inclines with respect to the center axis | shaft of the valve body 3 at the time of the initial action of decomposition | disassembly operation | movement. It should be noted that the tilt restricting portion 32b1 only needs to be opposed to the head 64B so as to be able to contact at least the head 64B tilted during the disassembling operation. Therefore, a gap may be provided between the tilt restriction part 32b1 and the head part 64B during normal times. FIG. 3 shows an example having the gap. In this case, when assembling the sprinkler head S, the main body 64 and the frame 2 can be assembled correctly by ensuring that the head 64B is not caught on the inner peripheral surface 32b. On the other hand, if there is no problem in assembling, the tilt restricting portion 32b1 and the head portion 64B may be in contact with each other over the entire circumference.

  An annular contact surface 33 with which the nozzle end 11 a contacts is formed on the outer periphery of the base end of the protrusion 31 of the valve body 3. As shown in FIG. 2, the valve body 3 is attached to a disk-shaped deflector 41, and the deflector 41 can rotate with respect to the valve body 3.

  Between the valve body 3 and the nozzle end 11a, a water-stop sheet made of fluororesin is installed as a seal member (not shown). The water stop sheet is affixed to the contact surface 33 of the valve body 3 or the nozzle end 11a. Alternatively, the water-stop sheet may be provided as a coating layer made of a fluororesin.

  As shown in FIGS. 2 and 3, the water sprinkling unit 4 includes a deflector 41, a guide ring 42, and a pin 43. The water sprinkling part 4 is accommodated in the internal space between the inner periphery of the frame 2 and the outer periphery on the outlet side of the nozzle 11.

  The deflector 41 is integrated with the above-described valve body 3, and a cylindrical peripheral wall 34 that forms a recess 32 of the valve body 3 is inserted through the center hole of the deflector 41. A plurality of slits 45 are formed on the periphery of the deflector 41, and the water spray pattern is controlled by the shape of the slits 45. A plurality of holes through which the pins 43 are inserted and fixed are provided on the periphery of the deflector 41.

  The guide ring 42 is formed in a ring shape, and the inner peripheral diameter is larger than the outer peripheral diameter on the outlet side of the nozzle 11. The outer diameter of the guide ring 42 is slightly smaller than the inner diameter of the frame 2 and larger than the inner diameter of the step portion 22 of the frame 2. The guide ring 42 is slidable along the inner peripheral surface of the frame 2 and is anchored to the step portion 22 when the sprinkler head S is operated. The guide ring 42 has a plurality of holes through which the pins 43 are inserted, and the positions thereof correspond to the positions of the holes through which the pins 43 installed in the deflector 41 are inserted. A coil spring 49 that urges the guide ring 42 toward the step portion 22 of the frame 2 is installed on the upper portion of the guide ring 42 (FIG. 1).

  A plurality of claws 42 a are formed along the outer periphery of the nozzle 11 on the inner peripheral portion of the guide ring 42. As shown in FIG. 2, the present embodiment shows an example in which three claws 42a are provided. The outer periphery on the outlet side of the nozzle 11 where the claw 42a is disposed is a tapered portion 11b, so that the tip of the claw 42a is not caught by the tapered portion 11b when the guide ring 42 is inclined and slid. It is composed.

  The pin 43 is formed in a thin rod shape, and a collar portion 48 is formed on one end side. The pin 43 is inserted into the holes of the deflector 41 and the guide ring 42 described above, and the guide ring 42 and the deflector 41 are inserted in this order from the other end side where the flange portion 48 is not provided. After the insertion, the other end side of the pin 43 is fixedly installed on the deflector 41 by caulking. As a result, the guide ring 42 can slide along the pin 43.

  The combination disc spring 5 is installed between the valve body 3 and the thermal decomposition unit 6. The combination disc spring 5 includes a main disc spring 51 that is in contact with the valve body 3 and an auxiliary disc spring 52 that is in contact with the thermal decomposition unit 6. Through holes 51C and 52C are provided in the center of both the main disc spring 51 and the auxiliary disc spring 52, respectively, and a head 64B of a set screw 64 described later is inserted into the through holes 51C and 52C.

  In the present embodiment, the outer diameter of the auxiliary disc spring 52 is larger than the outer diameter of the main disc spring 51. The outer diameter of the auxiliary disc spring 52 is smaller than the outer diameter of the guide ring 42 and the inner peripheral diameter of the step portion 22 of the frame 2. In FIG. 1, the outer periphery of the main disc spring 51 and the auxiliary disc spring 52 and the inner peripheral surface of the frame 2 are in a separated state.

  The main disc spring 51 includes an annular outer peripheral portion 51A and a spring piece portion 51B extending from the inner periphery toward the center in a cantilever shape. The outer peripheral portion 51A has a function of receiving a load, and the spring piece portion 51B is configured to function as a deflection (displacement amount). As shown in the drawing, the spring piece portions 51B are provided at six locations, are formed to have substantially the same width (parallel), and the base end portion is formed as an arc-shaped edge that extends in an arc shape. The distance between the tips of the spring pieces 51B (the inner diameter of the main disc spring 51) is slightly larger than the outer diameter of the head 64B of the set screw 64. The main disc spring 51 is formed so as to increase from the outer peripheral side toward the center.

  As with the main disc spring 51, the auxiliary disc spring 52 is composed of an outer peripheral portion 52A and a short spring piece portion 52B. The short spring piece 52B is shorter than the spring piece 51B of the main disc spring 51 and has a small amount of deflection. The short spring piece portions 52B are provided at four locations and are formed to have substantially the same width (parallel), and the base end portion is formed as an arc-shaped edge that extends in an arc shape. The distance between the tips of the short spring pieces 52B (the inner diameter of the auxiliary disc spring 52) is slightly larger than the outer diameter of the head 64B of the set screw 64.

  The auxiliary disc spring 52 is formed so as to increase from the outer peripheral side toward the center. The free height of the auxiliary disc spring 52 when no load is applied is smaller than that of the main disc spring 51. As described above, the auxiliary disc spring 52 has a larger diameter than the main disc spring 51. For this reason, the auxiliary | assistant disc spring 52 can stabilize the operation | movement which the main disc spring 51 bends and deform | transforms by supporting the outer edge of the main disc spring 51 by the inner side inclined surface 52D. Therefore, the auxiliary disc spring 52 has a function as a “support member” of the main disc spring 51. Further, the auxiliary disc spring 52 has a shape in which the free height when no load is applied is almost flat compared to the main disc spring 51. The auxiliary disc spring 52 has a function as a “support member” for stably holding the main disc spring 51. For this reason, since the free height of the auxiliary disc spring 52 under no load is almost flat and the amount of deflection is smaller than that of the main disc spring 51, the support to the main disc spring 51 by the auxiliary disc spring 52 does not become a waist height and is stable. The main disc spring 51 can be supported. Further, the plate thickness of the auxiliary disc spring 52 is formed to be thicker than the plate thickness of the main disc spring 51, and the amount of deflection of the auxiliary disc spring 52 can be made smaller than that of the main disc spring 51. Further, the outer diameter of the auxiliary disc spring 52 when no load is applied is smaller than the outer diameter of the slider 62 described later.

  The main disc spring 51 and the auxiliary disc spring 52 are combined so that their outer edge sides are in contact with each other, and the head 64B of the set screw 64 is inserted through the through holes 51C and 52C. Thus, a load is applied to the main disc spring 51 and the auxiliary disc spring 52 by the frictional resistance between the outer edge of the main disc spring 51 and the funnel-shaped or mortar-shaped inner inclined surface 52D of the outer peripheral portion 52A of the auxiliary disc spring 52. When the load is removed or the load is removed, the position shift of the central axis can be prevented. Therefore, a load is equally applied to the main disc spring 51 and the auxiliary disc spring 52, and malfunction of the sprinkler head S due to damage due to overload or load bias can be prevented.

  The main disc spring 51 is installed on the valve body 3 side, and the auxiliary disc spring 52 is installed on the thermal decomposition section 6 side. With such a configuration, since the amount of deflection of the auxiliary disc spring 52 is small, when the sprinkler head S is operated, the head 64B of the set screw 64 is inserted into the auxiliary disc spring 52 and the auxiliary disc spring 52 is moved. It can be dropped out of the frame 2 together with the thermal decomposition part 6. Accordingly, it is possible to prevent the outer peripheral edge of the auxiliary disc spring 52 from interfering with the inner periphery of the frame 2 in the operation process.

  The thermal decomposition unit 6 includes a plurality of balls 61, a slider 62, a balancer 63, a set screw 64, a plunger 65, and a cylinder 66.

  The plurality of balls 61 are steel spheres, and eight balls of the same size are used in this embodiment. The ball 61 is accommodated in a recess formed on the periphery of a disk-shaped slider 62. The lower outer periphery of the ball 61 is locked to the step portion 22 of the frame 2, and the slider 62 presses the ball 61 from above. As a result, a force that moves toward the central axis of the sprinkler head S is constantly acting on each ball 61.

  The slider 62 is formed in a disk shape, and as described above, the same number of eight recesses as the ball 61 are formed on the periphery of the surface facing the balancer 63 side. The eight dents are installed at equal intervals along the circumferential direction of the slider 62, whereby the load applied to the eight balls 61 becomes uniform. By making the load uniform, it is possible to prevent the load from being concentrated on a part of the parts, thereby preventing the parts from being damaged, and preventing the slider 62 from being inclined due to the non-uniform load. As a result, a load for closing the nozzle end 11 a by the combination disc spring 5 installed on the slider 62 is applied to the center of the nozzle 11. Therefore, the load by the combination disc spring 5 is uniformly applied to the nozzle end 11a through the valve body 3, and the water leakage from the nozzle 11 can be prevented.

  The balancer 63 is formed in a cylindrical shape, and the upper portion of the outer peripheral surface is installed inside the ball 61, and the movement of the ball 61 is prevented by a step portion 63A formed on the side surface thereof. The slider 62 and the balancer 63 have a through hole in the center. A leg portion of the set screw 64 is inserted into the through hole of the slider 62, and a plunger 65 is inserted into the through hole of the balancer 63.

  The set screw 64 has a head portion 64B and leg portions 64C. The head portion 64 </ b> B is inserted through the aforementioned recess 32, the through hole 51 </ b> C of the main disc spring 51, and the through hole 52 </ b> C of the auxiliary disc spring 52. The tip of the head 64B of the set screw 64 is formed in a spherical shape. The distal end side of the leg portion 64 </ b> C is a male screw 64 </ b> A, and is inserted into the through hole of the slider 62 and then screwed with a female screw 65 </ b> A installed on the inner periphery of the plunger 65.

  The height of the head 64B of the set screw 64 is formed so as to be larger than the free height of the plurality of stacked combination disc springs 5, and serves as a guide when the combination disc springs 5 are overlapped. Fulfill. If the height of the head portion 64B of the set screw 64 is low, the combination disc spring 5 may be crushed more than necessary when it is assembled, so that it does not function. It is possible to hold the combination disc spring 5 in a stable state. Further, when the sprinkler head S is operated (when the thermal decomposition unit 6 is disassembled), the head 64B of the set screw 64 remains inserted through the main disc spring 51 and the auxiliary disc spring 52, and the main disc spring 51 And the auxiliary disc spring 52 can be dropped out of the frame 2 together with the thermal decomposition part 6. Accordingly, it is possible to prevent the outer peripheral edges of the main disc spring 51 and the auxiliary disc spring 52 from interfering with the inner periphery of the frame 2 in the operation process of the sprinkler head S. Further, as described above, since the inner peripheral surface 32b of the recess 32 of the valve body 3 through which the head portion 64B of the set screw 64 is inserted is tapered, the inclination of the set screw 64 when the sprinkler head S is operated is suppressed. Generation of lodgement can be suppressed.

  The plunger 65 is formed in a cylindrical shape, and the above-described female screw 65A is formed on the inner periphery of the upper end. The upper end of the plunger 65 has a length exceeding the upper end of the balancer 63. As shown in FIG. 6, a flange portion 65B is formed at the lower end of the plunger 65, and a ring-shaped low melting point alloy 67 is placed on the upper surface of the flange portion 65B. A cylinder 66 is installed so as to cover the low melting point alloy 67.

  A hole 65 </ b> C is formed on the inner side of the flange portion 65 </ b> B from the lower end of the plunger 65 to the female screw 65 </ b> A. The inner diameter of the hole 65C is larger than the nominal diameter of the female screw 65A, and a thin portion 65D is installed between the outer peripheral diameter of the plunger 65 and the inner peripheral diameter of the hole 65C. The thin-walled portion 65D has a smaller cross-sectional area than the female screw 65A and the flange portion 65B, and the heat conduction efficiency is not good, so that the heat absorbed on the flange portion 65B side is hardly transmitted to the female screw 65A side. Further, in order to supplement the strength of the thin portion 65D, a resin cap may be inserted into the hole 65C.

  The cylinder 66 is made of copper or a copper alloy, and makes it easy to transfer heat absorbed from the surface of the cylinder 66 to the low melting point alloy 67. The cylinder 66 has a recess 66A in which the low melting point alloy 67 is accommodated, and a through-hole through which the plunger 65 is inserted is provided at the center of the recess 66A. A disk part 66B extended toward the outside is provided at the edge of the recess 66A, and the outer edge of the disk part 66B is a side part 66C erected in the direction of the frame 2. A plurality of slot-like openings 66D are provided on the side surface 66C. The external airflow can reach the outer peripheral surface of the recess 66A through the opening 66D, and heat from the airflow is easily transmitted to the low melting point alloy 67 accommodated in the recess 66A in the event of a fire. Yes.

  A ring-shaped heat insulating material 68 is installed between the recess 66 </ b> A and the lower end of the balancer 63, and the heat of the fire transmitted to the cylinder 66 by the heat insulating material 68 is prevented from propagating to the balancer 63. The above-described hole 65C can be formed up to the position of the heat insulating material 68, thereby further improving the heat insulating effect.

  In FIG. 6, a disc-shaped heat sensitive plate 69 is installed between the heat insulating material 68 and the recess 66A. The heat sensitive plate 69 is formed of copper or a copper alloy, and the heat absorbed by the surface is recessed so that it is easily transmitted to the low melting point alloy 67 inside the 66A.

  Next, the operation of the sprinkler head S of FIG. 1 will be described with reference to FIG. 7A to 7D are diagrams illustrating an operation process of the sprinkler head S. FIG.

(A) In the monitoring state of the sprinkler head S, pressurized fire-extinguishing water is supplied to the nozzle 11 of the main body 1, and the pressure of the fire-extinguishing water is applied to the valve body 3 (FIG. 7A).

(B) When a fire occurs and the hot airflow hits the cylinder 66, the heat is transferred to the low melting point alloy 67. When the low melting point alloy 67 is heated from the surroundings and starts to melt, the melted low melting point alloy 67 flows out of the gap formed between the plunger 65 and the recess 66A of the cylinder 66 and the volume thereof decreases. (FIG. 7B).

  When the low melting point alloy 67 is melted and flows out of the recess 66 </ b> A, the cylinder 66 descends corresponding to the outflow amount of the low melting point alloy 67. When the cylinder 66 is lowered, the heat insulating material 68 and the balancer 63 installed on the cylinder 66 are lowered (FIG. 7B).

  When the balancer 63 descends, the gap between the balancer 63 and the slider 62 increases, and the ball 61 biased in the central axis direction (inner side) moves inward beyond the stepped portion 63A of the balancer 63, and the frame 2 The step 22 and the ball 61 are disengaged.

  Until the thermal decomposition part 6 is disassembled and its components are moved, that is, until the combined disc spring 5 and the thermal decomposition part 6 are moved down from the stepped portion 22 and the main disc spring 51 is lowered. By the bending deformation until the auxiliary disc spring 52 is restored to the no-load state, the valve body 3 can be pressed against the nozzle end 11a to maintain the closed state of the nozzle 11. That is, a load is applied to the valve body 3 while the deflection amount (displacement amount) until the main disc spring 51 and the auxiliary disc spring 52 are restored to a no-load state from a loaded state compressed in a flat plate shape remains. Then, the valve body 3 can block the nozzle 11 until the thermal decomposition part 6 falls completely. Thus, according to the sprinkler head S including the main disc spring 51 and the auxiliary disc spring 52, the movement amount of the components of the thermal decomposition unit 6 during the decomposition operation is absorbed by the large deflection amount obtained by the combination thereof. The valve element 3 can be stably held at the nozzle end 11a during the period from the melting of the low melting point alloy 67 to the operation of the sprinkler head S.

  Here, the main disc spring 51 is in contact with the valve body 3, and the auxiliary disc spring 52 is in contact with the slider 62. When the thermal decomposition unit 6 is tilted and actuated (see FIG. 7B), the auxiliary disc spring 52 follows the tilt of the slider 62, and the axis of the main disc spring 51 and the auxiliary disc spring 52 shifts. Since the outer edge is in contact with the inner inclined surface 52D of the outer peripheral portion 52A of the auxiliary disc spring 52, excessive deviation of the axis of the main disc spring 51 can be suppressed by the frictional resistance. The spring piece 51B of the main disc spring 51 is in contact with the tip of the peripheral wall 34 protruding from the bottom surface of the valve body 3, and the load of the main disc spring 51 and the auxiliary disc spring 52 can be stably applied to the valve body 3. it can. In addition to the above, the inner peripheral surface 32b of the recess 32 of the valve body 3 is tapered to prevent the set screw 64 from being excessively inclined.

(C) When the thermal decomposition part 6 arranged under the valve body 3 falls, the combination disc spring 5 and the valve body 3 descend (FIG. 7C). At that time, the main disc spring 51 and the auxiliary disc spring 52 are lowered while the head portion 64B of the set screw 64 of the thermal decomposition unit 6 is inserted. The main disc spring 51 descends out of the frame 2 with the head 64B of the set screw 64 inserted through the auxiliary disc spring 52. Since the outer diameter of the main disc spring 51 is smaller than that of the auxiliary disc spring 52, interference with the inner circumference of the frame 2 can be avoided.

  Further, as the valve body 3 is lowered, the deflector 41 attached to the valve body 3, the guide ring 42 attached to the deflector 41 and the pin 43 are lowered. When the pin 43 is lowered, the collar portion 48 at the upper portion is locked to the guide ring 42, the guide ring 42 is locked to the step portion 22 of the frame 2, and the valve body 3 and the deflector 41 are moved from the frame 2 by the pin 43. It becomes a suspended state. At this time, when the inside of the frame 2 is moved downward with the guide ring 42 tilted, the tip of the claw 42a can move without interference by the tapered portion 11b of the nozzle 11.

(D) When the valve body 3 is lowered as described above, the nozzle 11 is opened, and the pressurized fire-extinguishing water collides with the deflector 41 and is scattered in all directions to extinguish the fire (FIG. 7D).

Modification of the embodiment

  In the above-described embodiment, the inner peripheral surface 32b is exemplified by the tapered recess 32. However, as shown in the modified examples of FIGS. 8 and 9, the opening 32c of the recess 32 has an inclined surface that spreads at an acute angle with respect to the inner peripheral surface 32b. The part 32c1 may be provided. Thereby, in the operation process, when the combination disc spring 5 is in a deformed state, the head 64B of the set screw 64 is in a state in which the inclination is suppressed by the recess 32, and when the thermal decomposition unit 6 falls off. The slanted portion 32c1 having a large gap with the head portion 64B can be removed smoothly.

  The combination disc spring 5 of the above embodiment has been shown as an example constituted by the main disc spring 51 and the auxiliary disc spring 52. However, if there is a sufficient amount of deflection of the main disc spring 51, the auxiliary disc spring 52 can be Alternatively, a flat washer can be used.

S Sprinkler Head 1 Body 1a Flange 2 Frame 3 Valve 4 Sprinkler 5 Combination Belleville Spring 6 Thermal Decomposition Unit 11 Nozzle 11a Nozzle End (Outlet)
11b Tapered part 13 Screw part 21 Screw part 22 Step part 31 Projection 32 Recess (recess)
32a Contact portion 32b Inner peripheral surface 32b1 Inclination restricting portion 32c Opening portion 32c1 Slope portion 33 Contact surface 34 Perimeter wall 41 Deflector 42 Guide ring 42a Claw 43 Pin 51 Main disc spring 51A Outer peripheral portion 51B Spring piece portion 51C Through hole 52 Auxiliary plate Spring 52A Outer peripheral portion 52B Short spring piece portion 52C Through hole 52D Inner inclined surface 61 Ball 62 Slider 63 Balancer 63A Stepped portion 64 Set screw 64A Male screw 64B Head portion 64C Leg portion 65 Plunger 65A Female screw 65B Hook portion 66 Cylinder 67 Low Melting point alloy 68 Heat insulating material 69 Heat sensitive plate

Claims (7)

A body having a nozzle inside;
A valve body for closing the outlet of the nozzle;
A thermal decomposing unit that keeps the valve body closing the outlet and operates by decomposing by melting of a low-melting-point alloy;
A disc spring member for biasing the valve body against the outlet;
A set screw through which the disc spring member is inserted,
The valve body has a recess for inserting a head on one end side of the set screw,
In the sprinkler head, the concave portion has an opening on the side where the head is inserted, and a contact portion on which the head inserted from the opening can abut.
The inner peripheral surface of the recess is formed such that a gap with the head on the opening side is wider than a gap with the head on the contact part side. Sprinkler head.
The inner peripheral surface of the concave portion has a tilt regulating portion on the abutting portion side, the tilt regulating portion for regulating an excessive tilting of the thermal thermal decomposition portion by contacting the head when the thermal decomposition portion is disassembled. The sprinkler head described.
3. The sprinkler head according to claim 1, wherein the inner peripheral surface of the recess has a tapered shape whose diameter increases from the contact portion side toward the opening portion side.
The sprinkler head according to claim 1, wherein the opening has a sloped portion that spreads at an acute angle with respect to the inner peripheral surface.
A guide ring having claws erected along the outer peripheral surface of the nozzle;
A deflector connected by a pin to the guide ring;
The sprinkler head according to any one of claims 1 to 4, further comprising a tapered tapered portion that tapers toward the outlet side on an outer peripheral surface of the outlet of the nozzle.
The said disc spring member is a combination disc spring which overlap | superposed and comprised the main disc spring and the auxiliary disc spring in which the deflection amount by a deflection deformation is smaller than a main disc spring. Sprinkler head.
The sprinkler head according to any one of claims 1 to 6, wherein a height of the head of the set screw is equal to or greater than a deflection amount of the disc spring member.

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