JP6846261B2 - Sprinkler head - Google Patents

Description

The present invention relates to a sprinkler head for fire extinguishing.

The sprinkler head automatically operates in the event of a fire to spray water, and has a nozzle connected to a water supply pipe and a heat-sensitive decomposition unit that operates by the heat of the fire. In normal times, the nozzle outlet is closed by a valve body. A load for closing the nozzle outlet is applied to the valve body via the heat-sensitive decomposition part, and a disc spring is installed between the valve body and the heat-sensitive decomposition part to close the nozzle outlet. I'm pressing my body.

As such a sprinkler head, one using a ball or a ring for a heat-sensitive decomposition portion is known (see, for example, Patent Document 1). In these sprinkler heads, the amount of movement of the components required to operate and spray water is set large, and the load for closing the nozzle does not easily decrease even when an external force is applied in normal times, for example. It has a feature of excellent impact resistance.

Japanese Unexamined Patent Publication No. 2012-105952

In the sprinkler head of Patent Document 1 described above, when an external force is applied, the ball and other components are slightly misaligned, but such misalignment causes the sprinkler head to operate and move until water is sprinkled. It is smaller than the amount and does not work. On the other hand, when the low melting point alloy melted due to a fire, one of the balls started to move, and by the time the heat-sensitive decomposition part fell off, a plurality of balls had come off the step part of the frame to support the heat-sensitive decomposition part. The balance is lost. As a result, the heat-sensitive decomposition portion cannot be held at the step portion of the frame, the heat-sensitive decomposition portion falls off, the valve body is opened, and the sprinkler head is operated.

Further, in order to hold the valve body at the nozzle end, which is the outlet of the nozzle, from the melting of the above-mentioned low melting point alloy until the heat-sensitive decomposition part falls off, a disc spring is provided between the heat-sensitive decomposition part and the valve body. is set up. This disc spring absorbs the amount of movement of the component parts of the heat-sensitive decomposition part when the sprinkler head is activated by the amount of deflection (displacement amount), and holds the valve body at the nozzle end. Therefore, as described above, when the amount of movement of the components of the heat-sensitive decomposition portion required for operating the sprinkler head is large, the disc spring needs a large amount of deflection in order to hold the valve body at the nozzle end.

If the amount of deflection of this disc spring is not sufficient, the valve body may separate from the nozzle end during the operation of the sprinkler head, and water in the nozzle may leak out. If the water leaking from the nozzle travels through the heat-sensitive decomposition part and reaches the low-melting-point alloy, the molten low-melting-point alloy is cooled and solidified, and the sprinkler head may stop operating halfway. Therefore, it is preferable that the disc spring has a sufficient amount of deflection while exerting a predetermined closing load of the valve body. In order to give the disc spring a sufficient amount of deflection, it is conceivable to increase the height (free height) of the disc spring when there is no load, but it is necessary to increase not only the height but also the outer diameter of the disc spring. Therefore, there is a problem that the entire sprinkler head becomes large.

It is the present invention that has been made against the background of the above-mentioned prior art. An object of the present invention is to provide a sprinkler head capable of stably holding a valve body at a nozzle end from melting of a low melting point alloy to operation of a sprinkler head without increasing the size of a disc spring. There is.

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

That is, the present invention is a sprinkler including a main body having a nozzle inside, a valve body that closes the outlet of the nozzle, and a heat-sensitive decomposition portion that maintains the closed state of the valve body and decomposes by melting a low melting point alloy. The head is a main disc spring that is installed between the heat-sensitive decomposition unit and the valve body and absorbs the movement of the heat-sensitive decomposition unit during the decomposition operation by bending deformation to maintain the closed state by the valve body. It is characterized by being provided with an auxiliary disc spring that is installed on the main disc spring and has a deflection amount that complements the deflection amount due to the deflection deformation of the main disc spring.

According to the present invention, 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 heat-sensitive decomposition portion during the disassembly operation can be performed without increasing the height and outer diameter of the main disc spring. The movement of the component can be absorbed by the larger amount of deflection of the main disc spring and the auxiliary disc spring combined. As a result, the valve body can be stably held at the nozzle end, which is the outlet of the nozzle, from the melting of the low melting point alloy to the operation of the sprinkler head.

In the present invention, the outer diameter of the auxiliary disc spring is formed to be larger than the outer diameter of the main disc spring, so that the outer edge of the main disc spring is placed on the slope of the auxiliary disc spring. Can be configured. According to the present invention, the auxiliary disc spring supports the outer edge of the main disc spring by its slope, so that the bending deformation operation of the main disc spring can be stabilized. Therefore, the auxiliary disc spring can have a function as a "support member" of the main disc spring. In addition, by supporting the outer edge of the small-diameter main disc spring by the slope of the large-diameter auxiliary disc spring, the main disc spring is less likely to shift laterally, and the central axis with the main disc spring mounted on the auxiliary disc spring It is possible to prevent misalignment.

In the present invention, the amount of deflection of the auxiliary disc spring can be configured to be smaller than the amount of deflection of the main disc spring. According to the present invention, since the amount of deflection of the auxiliary disc spring is smaller than the amount of deflection of the main disc spring, the movement due to the deflection deformation of the auxiliary disc spring is reduced, and the deflection deformation of the main disc spring is stably exhibited. Can be done. Further, as described above, the auxiliary disc spring has a function as a "support member" for stably holding the main disc spring. Therefore, according to the present invention, since the amount of deflection of the auxiliary disc spring is smaller than that of the main disc spring, the support of the auxiliary disc spring to the main disc spring does not become high, so that the main disc spring can be stably supported.

As the main disc spring and the auxiliary disc spring as described above, those having different spring characteristics can be used. Examples of different spring characteristics include thickness, height under no load (free height), material, difference in hardness, shape of center hole, etc., and the main disc spring and the auxiliary disc spring are different. It can be configured as a combination of different disc springs with spring characteristics. Further, a plurality of main disc springs and a plurality of auxiliary disc springs may be provided.

According to the present invention, there is provided a sprinkler head capable of stably holding a valve body at a nozzle end from melting of a low melting point alloy to operation of a sprinkler head without increasing the size of a disc spring. be able to.

Sectional drawing of the sprinkler head by one Embodiment. FIG. 3 is a perspective view of a sprinkler portion provided in the sprinkler head of FIG. It is a figure which shows the main disc spring provided in the sprinkler head of FIG. 1, the fractional view (a) is a plan view, the fractional view (b) is a perspective view, and the fractional view (c) is a sectional view. It is a figure which shows the auxiliary disc spring provided in the sprinkler head of FIG. 1, the sectional view (a) is a plan view, and the sectional view (b) is a sectional view. An enlarged cross-sectional view of the periphery of the cylinder of the sprinkler head of FIG. FIG. 2 is a cross-sectional view showing an operating process of the sprinkler head of FIG. It is a figure which shows the modification of the auxiliary disc spring.

An embodiment of the sprinkler head 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 sprinkler unit 4, a combination disc spring 5, and a heat-sensitive decomposition unit 6.

The main body 1 is formed in a cylindrical shape, and a nozzle 11 is formed inside the main body 1. A screw portion 12 connected to a water supply pipe (not shown) is provided on the upper end side of the outer circumference of the main body 1, a nozzle 11 extends on the inner surface side thereof, and an outlet of the nozzle 11 is provided at 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. A flange portion 1a protrudes from the middle portion of the outer periphery of the main body 1, and a screw portion 13 connected to the frame 2 is formed on the inner edge portion of the flange portion 1a.

The frame 2 is formed in a cylindrical shape, and a screw portion 21 is provided at the 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 projecting inward is formed on the inner circumference of the lower end of the frame 2, and a ball 61 described later is locked to the step portion 22.

The valve body 3 is formed in a disk shape and is in contact with the nozzle end 11a to be closed. 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 is formed on the opposite surface thereof, and a set screw 64, which will be described later, is inserted into the recess 32. There is a gap between the inner circumference of the recess 32 and the outer circumference of the set screw 64, but if this gap is reduced, the set screw 64 can be suppressed from tilting during operation and the occurrence of lodge can be suppressed. An annular contact surface 33 with which the nozzle end 11a abuts is formed on the outer periphery of the base end of the protrusion 31 of the valve body 3. The valve body 3 is attached to the disk-shaped deflector 41 as shown in FIG. 2, and the deflector 41 is rotatable with respect to the valve body 3.

A fluororesin waterproof sheet is installed as a sealing member between the valve body 3 and the nozzle end 11a (not shown). The water stop sheet is attached to the contact surface 33 of the valve body 3 or the nozzle end 11a. Instead of this, the waterproof sheet may be provided as a coating layer made of a fluororesin.

As shown in FIG. 2, the watering section 4 includes a deflector 41, a guide ring 42, and a pin 43. The sprinkler portion 4 is housed in an internal space between the inner circumference of the frame 2 and the outer circumference on the outlet side of the nozzle 11.

The deflector 41 is integrally incorporated with the valve body 3 described above, and a cylindrical peripheral wall 34 forming a recess 32 of the valve body 3 is inserted into the center hole of the deflector 41. A plurality of slits 45 are engraved on the peripheral edge of the deflector 41, and the watering pattern is controlled by the shape of the slits 45. Further, a plurality of holes through which the pins 43 are inserted and fixed are provided on the peripheral edge 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 peripheral diameter of the guide ring 42 is slightly smaller than the inner peripheral diameter of the frame 2 and larger than the inner peripheral 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 moored to the step portion 22 when the sprinkler head is operated. The guide ring 42 is provided with 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 for urging the guide ring 42 to the step portion 22 of the frame 2 is installed above the guide ring 42 (FIG. 1).

The pin 43 is formed in the shape of a thin rod, 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 insertion, the other end side of the pin 43 is fixedly installed on the deflector 41 by caulking. This allows the guide ring 42 to slide along the pin 43.

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

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 diameter of the step portion 22 of the frame 2. In FIG. 1, the outer peripheral surfaces of the main disc spring 51 and the auxiliary disc spring 52 and the inner peripheral surface of the frame 2 are separated from each other.

The main disc spring 51 is composed of an annular outer peripheral portion 51A and a spring piece portion 51B extending from the inner circumference thereof 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 installed at six locations and are formed to have substantially the same width (parallel), and the base end portion thereof is formed as an arc-shaped edge extending in an arc shape. The distance between the tips of the spring piece portions 51B (inner diameter of the main disc spring 51) is slightly larger than the outer diameter of the head 64B of the set screw 64. Further, the main disc spring 51 is formed so as to become higher from the outer peripheral side toward the center.

The auxiliary disc spring 52 is a disc spring having a deflection amount that complements the deflection amount due to the deflection deformation of the main disc spring 51. Like the main disc spring 51, it is composed of an outer peripheral portion 52A and a short spring piece portion 52B. The short spring piece portion 52B is shorter than the spring piece portion 51B of the main disc spring 51, and the amount of deflection is small. The short spring piece portion 52B is installed at four locations and is formed to have substantially the same width (parallel), and the base end portion thereof is formed as an arc-shaped edge spreading in an arc shape. The distance between the tips of the short spring piece 52B (inner diameter of the auxiliary disc spring 52) is slightly larger than the outer diameter of the head 64B of the set screw 64.

Further, the auxiliary disc spring 52 is formed so as to become higher 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. From the above, the auxiliary disc spring 52 has a larger diameter than the main disc spring 51. Therefore, the auxiliary disc spring 52 supports the outer edge of the main disc spring 51 by its inner inclined surface 52D, so that the operation of the main disc spring 51 flexing and deforming can be stabilized. 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 close to flat as compared with the main disc spring 51. The auxiliary disc spring 52 has a function as a "support member" that stably holds the main disc spring 51. Therefore, since the free height of the auxiliary disc spring 52 when no load is applied is close to flat and the amount of deflection is smaller than that of the main disc spring 51, the support of the auxiliary disc spring 52 to the main disc spring 51 does not become waist high 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 formed to be 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 into the through holes 51C and 52C. As a result, 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. It is possible to prevent the displacement of the central axis when performing or removing the load. Therefore, the load is evenly applied to the main disc spring 51 and the auxiliary disc spring 52, and it is possible to prevent damage due to overload and malfunction of the sprinkler head S due to uneven load.

The main disc spring 51 is installed on the valve body 3 side, and the auxiliary disc spring 52 is installed on the heat-sensitive decomposition unit 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 auxiliary disc spring 52 is inserted while the head 64B of the set screw 64 is inserted into the auxiliary disc spring 52. It can be dropped out of the frame 2 together with the heat-sensitive decomposition unit 6. As a result, it is possible to prevent the outer peripheral edge of the auxiliary disc spring 52 from interfering with the inner circumference of the frame 2 during the operation process.

The heat-sensitive 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 in the present embodiment, eight balls of the same size are used. The ball 61 is housed in a recess formed on the periphery of the disk-shaped slider 62. The lower part of the outer circumference 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 side 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, eight recesses of the same number as the ball 61 are formed on the peripheral edge of the surface facing the balancer 63 side. The recesses are installed at equal intervals in the circumferential direction of the slider 62, whereby the load applied to the eight balls 61 becomes uniform. The uniform load prevents the load from concentrating on some parts to prevent damage to the parts, and also prevents the slider 62 from tilting due to non-uniform load. As a result, the load for closing the nozzle end 11a by the combined disc spring 5 installed on the slider 62 is applied to the center of the nozzle 11, so that the load is uniformly applied to the nozzle end 11a and water leakage from the nozzle 11 is prevented. 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 step portion 63A formed on the side surface of the balancer 63 prevents the ball 61 from moving. The slider 62 and the balancer 63 have a through hole in the center. The leg of the set screw 64 is inserted into the through hole of the slider 62, and the plunger 65 is inserted into the through hole of the balancer 63.

The set screw 64 has a head portion 64B and a leg portion 64C. The head 64B is inserted into the recess 32 described above, the through hole 51C of the main disc spring 51, and the through hole 52C of the auxiliary disc spring 52. The tip of the head 64B of the set screw 64 is formed in a spherical shape. The tip side of the leg portion 64C has a male screw 64A, which is inserted into the through hole of the slider 62 and then screwed with the female screw 65A installed on the inner circumference 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 laminated disc springs 5, and serves as a guide when the combined disc springs 5 are overlapped. Fulfill. If the height of the head 64B of the set screw 64 is low, the combined disc spring 5 may be crushed more than necessary during assembly and may not function. By setting the height of, it becomes possible to hold the combined disc spring 5 in a stable state. Further, the inner diameter of the recess 32 of the valve body 3 through which the head 64B of the set screw 64 is inserted can be made equal to the inner diameter of the combined disc spring 5, whereby the set screw 64 when the sprinkler head S operates can be made equal to the inner diameter of the set screw 64. The inclination can be suppressed and the occurrence of lodge can be suppressed.

The plunger 65 is formed in a cylindrical shape, and the above-mentioned female screw 65A is formed on the inner circumference 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. 3, 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 65C is formed inside the flange portion 65B from the lower end of the plunger 65 to the female screw 65A. 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 diameter of the plunger 65 and the inner diameter of the hole 65C. Since the thin-walled portion 65D has a smaller cross-sectional area than the female screw 65A and the flange portion 65B and has poor thermal conductivity, the heat absorbed by the flange portion 65B is less likely to be transmitted to the female screw 65A side. Further, a resin cap may be inserted into the hole 65C to supplement the strength of the thin portion 65D.

The cylinder 66 is made of copper or a copper alloy, and the heat absorbed from the surface of the cylinder 66 is easily transferred to the low melting point alloy 67. The cylinder 66 has a recess 66A in which the low melting point alloy 67 is housed, and a through hole through which the plunger 65 is inserted is provided in the center of the recess. A disk portion 66B extended outward is installed on the edge of the recess 66A, and the outer edge of the disk portion 66B is a side surface portion 66C erected in the direction of the frame 2. A plurality of elongated hole-shaped openings 66D are installed in the side surface portion 66C. The external airflow can reach the outer peripheral surface of the recess 66A through the opening 66D, and in the event of a fire, the heat from the airflow can be easily transferred to the low melting point alloy 67 housed inside the recess 66A. There is.

A ring-shaped heat insulating material 68 is installed between the recess 66A and the lower end of the balancer 63 to prevent the heat of the fire transmitted to the cylinder 66 by the heat insulating material 68 from propagating to the balancer 63. The above-mentioned hole 65C can be formed up to the position of the heat insulating material 68, whereby the heat insulating effect is further improved.

In FIG. 5, a disk-shaped heat sensitive plate 69 is installed between the heat insulating material 68 and the recess 66A. The heat sensitive plate 69 is made of copper or a copper alloy, and the heat absorbed on the surface is easily transferred to the low melting point alloy 67 inside the recess 66A.

Next, the operation of the sprinkler head S of FIG. 1 will be described with reference to FIG. 6 (a) to 6 (d) are views showing the operating process of the sprinkler head S.

(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. 6 (a). )).

(B) When a fire breaks out and the hot airflow hits the cylinder 66, the heat is transferred to the low melting point alloy 67. Then, when the low melting point alloy 67 is heated from the surroundings and begins to melt, the melted low melting point alloy 67 flows out from the gap formed between the plunger 65 and the recess 66A of the cylinder 66, and its volume decreases. (Fig. 6 (b)).

When the low melting point alloy 67 melts and flows out of the recess 66A, 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. 6 (b)).

When the balancer 63 descends, the gap between the balancer 63 and the slider 62 widens, and the ball 61 urged in the central axial direction (inside) moves inward beyond the step portion 63A of the balancer 63, and the frame 2 The engagement between the step portion 22 and the ball 61 is disengaged.

The main disc spring 51 until the heat-sensitive decomposition unit 6 is disassembled and its components move, that is, until the ball 61 is disengaged from the step 22 and the combined disc spring 5 and the heat-sensitive decomposition unit 6 are lowered. The valve body 3 can be pressed against the nozzle end 11a to maintain the closed state of the nozzle 11 due to the bending deformation until the auxiliary disc spring 52 is restored to the no-load state. That is, a load is applied to the valve body 3 while the amount of deflection (displacement amount) from the loaded state in which the main disc spring 51 and the auxiliary disc spring 52 are compressed into a flat plate shape to the restoration to the unloaded state remains. Then, the valve body 3 can close the nozzle 11 until the heat-sensitive decomposition unit 6 is completely dropped. At this time, the auxiliary disc spring 52 complements the amount of deflection due to the deflection deformation of the main disc spring 51 by the amount of deflection due to the deflection deformation thereof. As described above, according to the sprinkler head S provided with the main disc spring 51 and the auxiliary disc spring 52, the large amount of deflection obtained by the combination thereof absorbs the amount of movement of the component parts of the heat-sensitive decomposition unit 6 during the disassembly operation. The valve body 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 heat-sensitive decomposition unit 6 is tilted and operated (see FIG. 6B), the auxiliary disc spring 52 is displaced according to the tilt of the slider 62, and the axial cores of the main disc spring 51 and the auxiliary disc spring 52 are displaced. Since the outer edge of the spring 51 is in contact with the inner inclined surface 52D of the outer peripheral portion 52A of the auxiliary disc spring 52, excessive displacement of the axial center of the main disc spring 51 can be suppressed by the frictional resistance. The spring piece portion 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.

(C) When the heat-sensitive decomposition unit 6 arranged under the valve body 3 falls, the combination disc spring 5 and the valve body 3 are lowered. At that time, since the auxiliary disc spring 52 has a small amount of deflection and a low height in a no-load state, the auxiliary disc spring 52 descends with the head 64B of the set screw 64 of the heat-sensitive decomposition unit 6 inserted. The main disc spring 51 is left in a state where the head 64B of the set screw 64 is inserted following the auxiliary disc spring 52, or is separated from the head 64B and descends to the outside of the frame 2. 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 and the guide ring 42 and the pin 43 attached to the deflector 41 are lowered. When the pin 43 is lowered, the flange portion 43A above the pin 43 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 locked from the frame 2 by the pin 43. It will be in a suspended state.

(D) When the valve body 3 descends 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. 6 (d)).

Deformation Example of the Embodiment In the above-described embodiment, an example in which the main disc spring 51 is installed on the valve body 3 side and the auxiliary disc spring 52 is installed on the heat-sensitive decomposition unit 6 side is shown. On the other hand, when the main disc spring 51 having a large amount of deflection is installed on the heat-sensitive decomposition unit 6 side and the auxiliary disc spring 52 is installed on the valve body 3 side, the main disc spring 51 is framed in the operating process of the sprinkler head S. It can be made difficult to get caught in the step portion 22 of 2. Specifically, in the operating process of the sprinkler head S, the main disc spring 51 falls off from the frame 2 in a no-load state. At that time, since the cross-sectional shape of the main disc spring 51 is funnel-shaped or mortar-shaped, even if the main disc spring 51 falls off in an inclined state and the outer peripheral portion 51A comes into contact with the step portion 22, the outer peripheral portion 51A is stepped. It is difficult to get caught in the part 22. Further, since the amount of deflection of the auxiliary disc spring 52 is small, even if the heat-sensitive decomposition portion 6 tilts when the sprinkler head S operates, the auxiliary disc spring 52 on the valve body 3 side does not easily tilt, and the combined disc spring 5 acting on the valve body 3 It is possible to suppress the bias of the load as a whole.

In the above embodiment, the auxiliary disc spring 52 shown in FIG. 4 is illustrated, but for example, the auxiliary disc spring 53 of the modified example shown in FIG. 7 may be used. The auxiliary disc spring 53 is formed so as to become higher from the outer peripheral side toward the center, and its outer diameter is substantially the same as that of the auxiliary disc spring 52 of the embodiment. A plurality of arc-shaped slits 53A are formed between the outer edge of the auxiliary disc spring 53 and the central through hole 53C through which the head 64B of the set screw 64 is inserted. The corners of the inner edge of the slit 53A are rounded to avoid stress concentration. The spring piece portion 53B between the plurality of slits 53A is a portion that is elastically deformed by bending when a load is applied to the auxiliary disc spring 53. In addition to the auxiliary disc spring 53 shown in FIG. 7, the height of the auxiliary disc spring 52 (, 53) when no load is applied is smaller than that of the main disc spring 51, and has a larger diameter than that of the main disc spring 51. It can be used as an auxiliary disc spring if it has a shape that is closer to flat than the main disc spring 51 when there is no load.

S sprinkler head
1 Main body 1a Flange 2 Frame
3 valve body
4 Sprinkler
5 Combination disc spring
6 Thermal decomposition unit
11 Nozzle 11a Nozzle end 13 Threaded part 21 Threaded part 22 Stepped part 31 Protrusion 32 Recess 33 Contact surface 34 Peripheral wall 41 Deflector 42 Guide ring 43 Pin 51 Main disc spring 51A Outer circumference 51B Spring piece 51C Through hole 52 Auxiliary disc spring 52A Outer circumference 52B Short spring piece 52C Through hole 52D Inner inclined surface 53 Auxiliary disc spring (deformation example)
53A Slit 53B Spring piece 53C Through hole 53D Inner inclined surface 61 Ball 62 Slider 63 Balancer 63A Step 64 Set screw 64A Male screw 64B Head 64C Leg 65 Plunger 65A Female screw 65B Collar 66 Cylinder
67 Low melting point alloy
68 Insulation

Claims (3)

The main body with a nozzle inside and
A valve body that closes the outlet of the nozzle and
In a sprinkler head provided with a heat-sensitive decomposition portion that maintains the closed state of the valve body and decomposes and operates by melting the low melting point alloy.
A spring piece portion extending in a cantilever shape from the inner circumference of the outer peripheral portion of the annulus toward the center is provided, and is installed between the heat-sensitive decomposition portion and the valve body, and the heat-sensitive decomposition portion at the time of the decomposition operation. A main disc spring that absorbs the movement of the component parts by bending and deforming to maintain the closed state by the valve body, and
A short spring piece portion extending from the inner circumference of the outer peripheral portion of the annular shape toward the center in a cantilever shape and shorter than the spring piece portion is provided, and is installed so as to be overlapped with the main disc spring. It is equipped with an auxiliary disc spring having a deflection amount that complements the deflection amount due to the deflection deformation of the above .
The amount of deflection of the auxiliary disc spring is smaller than the amount of deflection of the main disc spring.
The outer diameter of the auxiliary disc spring is formed to be larger than the outer diameter of the main disc spring.
It said main disc outer edge of the spring, sprinkler head is characterized that you have placed on the inclined surface of the auxiliary disc spring. The sprinkler head according to claim 1, wherein the auxiliary disc spring has a smaller free height when no load is applied than the main disc spring. The main body with a nozzle inside and
A valve body that closes the outlet of the nozzle and
In a sprinkler head provided with a set screw for maintaining the closed state of the valve body and a heat-sensitive decomposition portion which is decomposed and operated by melting a low melting point alloy.
A main disc spring that is installed between the heat-sensitive decomposition unit and the valve body and absorbs the movement of the component parts of the heat-sensitive decomposition unit during the decomposition operation by bending deformation to maintain the closed state by the valve body.
An auxiliary disc spring, which is installed so as to be stacked on the main disc spring and has a deflection amount that complements the deflection amount due to the deflection deformation of the main disc spring, is provided.
The amount of deflection of the auxiliary disc spring is smaller than the amount of deflection of the main disc spring.
The head of the set screw is inserted into the through hole of the main disc spring and the auxiliary disc spring in the main disc spring and the auxiliary disc spring.
The main disc spring is arranged on the valve body side, the auxiliary disc spring is arranged on the heat-sensitive decomposition portion side, and the head of the set screw is inserted into the auxiliary disc spring when the sprinkler head is operated. A sprinkler head characterized in that the auxiliary disc spring falls off the frame together with the heat-sensitive decomposition portion.

Images