TW201836677A - Sprinkler head - Google Patents

Abstract

Provided is a sprinkler head capable of stably holding a valve element at a nozzle end during a time from when a low-melting-point alloy melts to when a sprinkler head is actuated. A sprinkler head S is provided with a combined belleville spring 5 between a heat-sensitive disassembly part 6 and a valve element 3. For the combined belleville spring 5, a main belleville spring 51 and an auxiliary belleville spring 52 having different spring properties are installed one on the other. This allows the amount of deflection of the auxiliary belleville spring 52 to compensate for the amount of deflection of the main belleville spring 51. Therefore, the valve element 3 can be stably held at a nozzle end 11a, without having to increase the height and the outer diameter of the main belleville spring 51, by absorbing the movement of component parts of the heat-sensitive disassembly part 6 at the time of disassembly through a large amount of deflection achieved by the main belleville spring 51 and the auxiliary belleville spring 52 combined.

Description

 Sprinkler head  

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

The sprinkler head is a sprinkler that automatically operates when a fire occurs, and includes a nozzle connected to the water supply pipe and a thermal decomposition unit that operates by the heat of the fire. The outlet of the normal nozzle is closed by the valve body. The load that closes the outlet of the nozzle via the thermosensitive decomposition unit is applied to the valve body, and a circular spring is disposed between the valve body and the thermal decomposition portion, and the valve body is pressed in the direction of closing the outlet of the nozzle.

In such a sprinkler head, it is known to use a ball or a ring in a thermal decomposition part (for example, refer to Patent Document 1). In the sprinkler heads, the amount of movement of the constituent elements required for watering in the operation is set to be large, and it is characterized in that, for example, even when the external force is normally received, the load of the closed nozzle is hard to be reduced, and the impact resistance is excellent.

[Prior patent documents]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-105952

In the sprinkler head of the above-mentioned Patent Document 1, when the external force is applied, some displacement occurs in the ball or other constituent elements, but with respect to the positional shift, the amount of movement of the sprinkling head is increased as compared with the sprinkling head. Smaller, not actionable. On the other hand, when the low melting point alloy is melted by the fire, any one of the balls starts to move, so that the thermal decomposition portion falls off, and a plurality of balls are separated from the segment portion of the frame, and the balance supporting the thermal decomposition portion is lost. Therefore, the thermosensitive decomposition portion cannot be held in the segment portion of the frame, and the thermosensitive decomposition portion is detached, and the valve body is opened, so that the sprinkler head operates.

Further, between the melting of the low melting point alloy and the detachment of the thermal decomposition portion, the circular spring is provided between the thermal decomposition portion and the valve body in order to hold the valve body at the nozzle end which is the output of the nozzle. The circular spring absorbs the movement of the constituent elements of the thermal decomposition portion when the sprinkler is operated by the amount of bending (displacement amount), and holds the valve body at the nozzle end. Therefore, as described above, in the case where the amount of movement of the constituent elements of the thermal decomposition portion required for the operation of the sprinkler head is large, in order to hold the valve body to the nozzle end, the circular spring requires a large amount of bending.

If the amount of bending of the circular spring is insufficient, the valve body may be detached from the nozzle end during the operation of the sprinkler head, and water in the nozzle may leak. When the water leaking from the nozzle reaches the low melting point alloy via the thermosensitive decomposition portion, the molten low melting point alloy is cooled and solidified, and the operation of the sprinkler head may be stopped in the middle. Therefore, it is preferable that the circular spring has a sufficient amount of bending while exerting a closed load on the predetermined valve body. In order to make the circular spring have a sufficient amount of bending, it is thought that the height (free height) of the circular spring when no load is increased, but since the height is not only the height but also the outer diameter of the circular spring needs to be large, there is a sprinkler head. The whole has become a subject of large-scale.

The present invention has been developed in the context of the prior art as shown above. SUMMARY OF THE INVENTION An object of the present invention is to provide a sprinkler head which does not cause a circular spring to become large, and which can stably hold the valve body at the nozzle end between the melting of the low melting point alloy and the action of the sprinkler head.

In order to achieve the above object, the sprinkler head of the present invention is constructed as shown below.

That is, the present invention relates to a sprinkler head including the following members, comprising: a body having a nozzle therein; a valve body closing the outlet of the nozzle; and a thermal decomposition portion for maintaining the closed state of the valve body, and borrowing low Melting of the melting point alloy to perform a decomposition operation; characterized in that the main circular spring is disposed between the thermal decomposition portion and the valve body, and absorbs the thermal decomposition portion during the decomposition operation by bending deformation Moving to maintain the closed state of the valve body; and the auxiliary circular spring is disposed to overlap the main circular spring and has a bending amount for supplementing the main circular spring The amount of bending caused by the bending deformation.

According to the present invention, since the amount of bending of the main circular spring can be supplemented by the amount of bending of the auxiliary circular spring, the height and outer diameter of the main circular spring are not increased, and the main circular spring and the auxiliary circle can also be used. The greater amount of bending of the springs together absorbs the movement of the constituent elements of the thermosensitive decomposition portion during the decomposition operation. Thereby, the valve body can be stably held at the nozzle end which is the outlet of the nozzle between the melting of the low melting point alloy and the operation of the sprinkler head.

In the present invention, the outer diameter of the auxiliary circular spring may be formed to be larger than the outer diameter of the main circular spring, and the outer edge of the main circular spring is placed on the auxiliary circular spring. Beveled. According to the present invention, the bending action of the main circular spring can be stabilized by the auxiliary circular spring supporting the outer edge of the main circular spring by its inclined surface. Therefore, the auxiliary circular spring can have a function as a "support member" of the main circular spring. Moreover, by supporting the outer edge of the main circular spring of the small diameter by the inclined surface of the auxiliary circular spring of the large diameter, the main circular spring is difficult to laterally shift, and the main circular spring can be prevented from being placed in the auxiliary circular shape. The position of the center axis of the state of the spring is offset.

In the present invention, the amount of bending of the auxiliary circular spring may be smaller than the amount of bending of the main circular spring. According to the present invention, since the amount of bending of the auxiliary circular spring is smaller than the amount of bending of the main circular spring, the movement caused by the bending deformation of the auxiliary circular spring can be made small, and the main circular spring can be stably exhibited. Bending deformation. Moreover, as described above, the auxiliary circular spring has a function as a "support member" for stably holding the main circular spring. Therefore, according to the present invention, since the amount of bending of the auxiliary circular spring is smaller than that of the main circular spring, the support of the main circular spring by the auxiliary circular spring is not high and unstable, and can be stably supported. Main circular spring.

The primary circular spring and the auxiliary circular spring system as shown above may use spring characteristics that are different. Examples of the difference in spring characteristics include thickness, height at no load (free height), difference in material and hardness, and shape of a center hole. The main circular spring and the auxiliary circular spring system can be configured as such. A combination of heterogeneous circular springs with different spring characteristics. Moreover, the main circular spring and the auxiliary circular spring system may be configured to respectively provide a plurality of

According to the present invention, it is possible to provide a sprinkler head which does not cause the circular spring to become large, and which can stably hold the valve body at the nozzle end between the melting of the low melting point alloy and the action of the sprinkling head.

S‧‧‧Sprinkler

1‧‧‧ Ontology

1a‧‧‧Flange

2‧‧‧Frame

3‧‧‧ valve body

4‧‧‧ sprinkling department

5‧‧‧ Combination round spring

6‧‧‧ Thermal Decomposition Department

11‧‧‧Nozzles

11a‧‧‧Nozzle end

13‧‧‧Threading Department

21‧‧‧Threading Department

22‧‧‧ Section

31‧‧‧ Protrusion

32‧‧‧ recess

33‧‧‧Abutment

34‧‧‧Walls

41‧‧‧ deflector

42‧‧‧Guide ring

43‧‧ ‧ sales

46, 47‧ ‧ holes

51‧‧‧Main circular spring

51A‧‧‧The outer part

51B‧‧·Spring Parts

51C‧‧‧through hole

52‧‧‧Auxiliary circular spring

52A‧‧‧The outer part

52B‧‧‧Short spring part

52C‧‧‧through hole

52D‧‧‧ inside inclined surface

53‧‧‧Auxiliary circular spring (variation)

53A‧‧ slit

53B‧‧·Spring Parts

53C‧‧‧through hole

53D‧‧‧ inside inclined surface

61‧‧‧ balls

62‧‧‧ slider

63‧‧‧balancer

63A‧‧ Section

64‧‧‧ fixing screws

64A‧‧‧ male thread

64B‧‧‧ head

64C‧‧‧foot

65‧‧‧Plunger

65A‧‧‧ female thread

65B‧‧‧Flange

66‧‧‧Cylinder

67‧‧‧Low melting point alloy

68‧‧‧Insulation materials

Figure 1 is a cross-sectional view of a sprinkler head of an embodiment.

Fig. 2 is a perspective view of the sprinkler portion included in the sprinkler head of Fig. 1.

Fig. 3 is a view showing a main circular spring included in the sprinkler head of Fig. 1, Fig. 3(a) is a plan view, Fig. 3(b) is a perspective view, and Fig. 3(c) is a cross-sectional view.

Fig. 4 is a view showing an auxiliary circular spring included in the sprinkler head of Fig. 1, Fig. 4(a) is a plan view, and Fig. 4(b) is a cross-sectional view.

Fig. 5 is an enlarged cross-sectional view showing the periphery of the cylinder of the sprinkler head of Fig. 1.

Fig. 6 is a cross-sectional view showing the operation of the sprinkler head of Fig. 1.

Fig. 7 is a view showing a modification of the auxiliary circular spring, and Fig. 7(a) is a plan view and Fig. 7(b) is a cross-sectional view.

An embodiment of the sprinkler head of the present invention will be described with reference to the drawings. The sprinkler head S includes a body 1, a frame 2, a valve body 3, a sprinkling portion 4, a combined circular spring 5, and a thermal decomposition portion 6.

The body 1 is formed in a cylindrical shape, and a nozzle 11 is formed inside thereof. The screw portion 12 connected to the water supply pipe (not shown) is provided at the upper end portion of the outer periphery of the main body 1, and the nozzle 11 is extended inside, and the nozzle end 11a serving as the outlet of the nozzle 11 is formed at the lower end thereof. The nozzle end 11a is in contact with the valve body 3, and is normally closed by the valve body 3. The flange portion 1a protrudes in the middle portion of the outer circumference of the body 1, and a screw portion 13 connected to the frame 2 is formed at the inner edge portion of the flange portion 1a.

The frame 2 is formed in a cylindrical shape, and at its upper end, a threaded portion 21 is provided, and the threaded portion 13 of the body 1 described above is screwed. On the inner circumference of the lower end of the frame 2, an annular portion 22 projecting inward is formed, and a ball 61 to be described later is locked to the segment portion 22.

The valve body 3 is formed in a disk shape and is closed by abutting against the nozzle end 11a. On the surface of the valve body 3 facing the nozzle 11, a projection 31 that enters the inside of the nozzle 11 is formed. The concave portion 32 is formed on the opposite surface, and the fixing screw 64, which will be described later, is inserted through the concave portion 32. There is a gap between the inner circumference of the concave portion 32 and the outer circumference of the fixing screw 64. However, when the gap is made small, the inclination of the fixing screw 64 is suppressed during the operation, and occurrence of blockage of the element at the time of decomposition of the thermal decomposition portion can be suppressed. On the outer periphery of the base end of the projection 31 of the valve body 3, a circular abutting surface 33 against which the nozzle end 11a abuts is formed. As shown in Fig. 2, the valve body 3 is attached to the disc-shaped deflector 41, and the deflector 41 is rotatable to the valve body 3.

A water stop sheet (not shown) made of a fluororesin is provided between the valve body 3 and the nozzle end 11a as a sealing member. The water stop sheet is adhered to the abutting surface 33 of the valve body 3 or the nozzle end 11a. Alternatively, the water stop film may be provided as a coating of a fluororesin.

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

The deflector 41 is integrally attached to the valve body 3 described above, and a cylindrical peripheral wall 34 forming the recess 32 of the valve body 3 is inserted through the center hole of the deflector 41. A plurality of slits 45 are engraved on the periphery of the deflector 41, whereby the sprinkling pattern is controlled by the shape of the slit 45. Further, a hole through which a plurality of pins 43 are inserted and fixed is provided on the periphery of the deflector 41.

The guide ring 42 is formed in a ring shape, and the inner circumferential diameter is larger than the outer circumferential diameter of the outlet side of the nozzle 11. The outer circumferential diameter of the guide ring 42 is smaller than the inner circumferential diameter of the frame 2 and larger than the inner circumferential diameter of the segment portion 22 of the frame 2. The guide ring 42 is slidable along the inner circumferential surface of the frame 2, and is locked to the segment portion 22 when the sprinkler head operates. In the guide ring 42, a hole through which a plurality of pins 43 are inserted is provided, the position of which corresponds to the position of the hole through which the pin 43 of the deflector 41 is inserted. At the upper portion of the guide ring 42, a coil spring 49 (Fig. 1) for biasing the guide ring 42 to the segment portion 22 of the frame 2 is provided.

The pin 43 is formed in a thin rod shape, and the flange portion 48 is formed on one end side. The pin 43 is inserted through the hole of the deflector 41 and the guide ring 42 described above, and is inserted through the other end side of the flangeless portion 48 in the order of the guide ring 42 and the deflector 41. After the insertion, the other end side of the pin 43 is fixedly disposed on the deflector 41 by caulking. Thereby, the guide ring 42 is slidable along the pin 43.

The combined circular spring 5 is provided between the valve body 3 and the thermal decomposition unit 6. The combined circular spring 5 has a main circular spring 51 that is in contact with the valve body 3, and an auxiliary circular spring 52 that is in contact with the thermal decomposition portion 6. Through holes 51C and 52C are provided in the center of the main circular spring 51 and the auxiliary circular spring 52, and the through holes 51C and 52C are inserted into the head 64B of the fixing screw 64 which will be described later.

In the present embodiment, the outer diameter of the auxiliary circular spring 52 is larger than the outer diameter of the main circular spring 51. The outer diameter of the auxiliary circular spring 52 is smaller than the outer diameter of the guide ring 42 and the inner circumference of the segment portion 22 of the segment portion 22. In the first drawing, the outer circumference of the main circular spring 51 and the auxiliary circular spring 52 are separated from the inner circumferential surface of the frame 2.

The main circular spring 51 is composed of a circular outer peripheral portion 51A and a spring piece portion 51B that is elongated in a cantilever shape from the inner circumferential center thereof. The outer peripheral portion 51A has a function of receiving a load, and the spring piece portion 51B is configured to function as a bending (displacement amount). The spring piece portion 51B is provided at six positions as shown in the figure, and is formed to have substantially the same width (parallel), and the base end portion is formed to be an arcuate edge that is enlarged in a circular arc shape. The interval between the front ends of the spring piece portions 51B (the inner diameter of the main circular spring 51) is slightly larger than the outer diameter of the head portion 64B of the fixing screw 64. Moreover, the main circular spring 51 is formed so as to become higher toward the center from the outer peripheral side.

The auxiliary circular spring 52 is a circular spring having a bending amount for complementing the amount of bending caused by the bending deformation of the main circular spring 51. The outer peripheral portion 52A and the short spring piece portion 52B are formed in the same manner as the main circular spring 51. The short spring piece portion 52B is shorter than the spring piece portion 51B of the main circular spring 51, and the amount of bending is small. The short spring piece portions 52B are provided at four places and formed to have substantially the same width (parallel), and the base end portions are formed to be curved in an arc shape. The interval between the front ends of the short spring piece portions 52B (the inner diameter of the auxiliary circular spring 52) is slightly larger than the outer diameter of the head portion 64B of the fixing screw 64.

Moreover, the auxiliary circular spring 52 is formed so as to become higher toward the center from the outer peripheral side. The free height of the auxiliary circular spring 52 when there is no load is smaller than that of the main circular spring 51. From the above, the auxiliary circular spring 52 has a larger diameter than the main circular spring 51. Therefore, by the auxiliary circular spring 52 supporting the outer edge of the main circular spring 51 by the inner inclined surface 52D, the action of bending deformation of the main circular spring 51 can be stabilized. Therefore, the auxiliary circular spring 52 has a function as a "support member" of the main circular spring 51. Further, the auxiliary circular spring 52 has a shape closer to a flat shape than that of the main circular spring 51 when there is no load. The auxiliary circular spring 52 has a function as a "support member" for stably holding the main circular spring 51. Therefore, since the free height of the auxiliary circular spring 52 at the time of no load is close to flat and the amount of bending is less than that of the main circular spring 51, the support of the main circular spring 51 by the auxiliary circular spring 52 is not high. It is unstable, and the main circular spring 51 can be stably supported. Further, the thickness of the auxiliary circular spring 52 is formed thicker than the thickness of the main circular spring 51, and the amount of bending of the auxiliary circular spring 52 can be made smaller than that of the main circular spring 51. Further, the outer diameter of the auxiliary circular spring 52 at the time of no load is formed to be smaller than the outer diameter of the slider 62 to be described later.

The main circular spring 51 and the auxiliary circular spring 52 are combined to be in contact with each other on the outer edge side, and in those through holes 51C, 52C, the head 64B of the fixing screw 64 is inserted. Therefore, a load is applied to the main circular spring 51 by the frictional resistance between the outer edge of the main circular spring 51 and the funnel shape of the outer peripheral portion 52A of the auxiliary circular spring 52 or the inner inclined surface 52D of the mortar shape. When the auxiliary circular spring 52 is used, or when the load is removed, the positional deviation of the central axis can be prevented. Therefore, the load is uniformly applied to the main circular spring 51 and the auxiliary circular spring 52, and the malfunction of the sprinkler head S caused by the damage caused by the overload or the bias of the load can be prevented.

The main circular spring 51 is provided on the valve body 3 side, and the auxiliary circular spring 52 is provided on the thermal decomposition portion 6 side. According to this configuration, since the amount of bending of the auxiliary circular spring 52 is small, when the sprinkler head S is operated, the head portion 64B of the fixing screw 64 is still inserted in the auxiliary circular spring 52. The auxiliary circular spring 52 comes off the frame 2 together with the thermal decomposition portion 6. Thereby, it is possible to prevent the outer circumference of the auxiliary circular spring 52 from interfering with the inner circumference of the frame 2 during the operation.

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

In the case of a plurality of balls made of a steel ball of 61 series, in the present embodiment, eight of the same sizes are used. The ball 61 is housed in a recess formed in the periphery of the disc-shaped slider 62. The lower portion of the outer circumference of the ball 61 is locked to the segment portion 22 of the frame 2, and the slider 62 presses the ball 61 from above. Thereby, the force which moves to the center axis side of the sprinkler head S always acts on each ball 61.

The slider 62 is formed in a disk shape, and as shown above, eight recesses having the same number as the balls 61 are formed on the peripheral edge of the surface facing the balancer 63. The recesses are provided at equal intervals in the circumferential direction of the slider 62, whereby the load applied to the eight balls 61 becomes uniform. By the load becoming uniform, the load is prevented from being concentrated toward a part of the components, the component is prevented from being damaged, and the inclination of the slider 62 caused by the unevenness of the load is prevented. Therefore, since the load of the closed nozzle end 11a of the combined circular spring 5 provided on the slider 62 is applied to the center of the nozzle 11, the load is uniformly applied to the nozzle end 11a, and leakage from the nozzle 11 can be prevented. .

The balancer 63 is formed in a cylindrical shape, and the outer peripheral surface portion is provided inside the ball 61, and the movement of the balls 61 is blocked by the segment portion 63A formed on the side surface thereof. The slider 62 and the balancer 63 have through holes at the center. In the through hole of the slider 62, the leg portion of the fixing screw 64 is inserted, and the plunger 65 is inserted through the through hole of the balancer 63.

The fixing screw 64 has a head portion 64B and a leg portion 64C, and the head portion 64B is inserted through the recess portion 32, the through hole 51C of the main circular spring 51, and the through hole 52C of the auxiliary circular spring 52. The front end of the head portion 64B of the fixing screw 64 is formed in a spherical shape. The front end side of the leg portion 64C is a male screw 64A, and after the through hole of the slider 62 is inserted, it is screwed to the female screw 65A provided on the inner circumference of the plunger 65.

The height of the head portion 64B of the fixing screw 64 is formed to be higher than the free height of the laminated plurality of laminated circular springs 5, and functions as a guide when the combined circular springs 5 are overlapped. In the case where the height of the head portion 64B of the fixing screw 64 is low, since the combined circular spring 5 is excessively crushed at the time of assembly and may not function, the height of the head portion 64B of the fixing screw 64 is set to not The extent to which this phenomenon will occur, the combined circular spring 5 can be held in a stable state. Further, the inner diameter of the recess 32 of the valve body 3 through which the head portion 64B of the fixing screw 64 is inserted can be made equal to the inner diameter of the combined circular spring 5, thereby suppressing the fixing screw 64 when the sprinkler head S operates. Tilting suppresses the occurrence of blockage of the element when the thermal decomposition portion is decomposed.

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, the flange portion 65B is formed at the lower end of the plunger 65, and the annular low-melting alloy 67 is placed on the upper surface of the flange portion 65B. The cylinder 66 is disposed to cover the low melting point alloy 67.

A hole 65C continuous from the lower end of the plunger 65 and the female screw 65A is formed inside the flange portion 65B. The inner diameter of the hole 65C is larger than the nominal diameter of the female screw 65A, and the thin portion 65D is provided between the outer circumferential diameter of the plunger 65 and the inner circumferential diameter of the hole 65C. The thin portion 65D has a smaller cross-sectional area than the female screw 65A or the flange portion 65B. Since the heat transfer efficiency is not good, it is difficult to transfer the heat sucked on the flange portion 65B side to the female screw 65A side. Moreover, in order to reinforce the strength of the thin portion 65D, a resin cap may be inserted into the hole 65C.

The cylinder 66 is formed of copper or a copper alloy, and heat absorbed from the surface of the cylinder 66 is easily transmitted to the low melting point alloy 67. The cylinder 66 has a recess 66A for accommodating the low melting point alloy 67, and a through hole through which the plunger 65 is inserted is formed in the center of the recess. The disk portion 66B that is expanded outward is provided at the edge of the recessed portion 66A, and the outer edge of the disk portion 66B is a side surface portion 66C that is erected in the direction of the frame 2. A plurality of elongated hole-shaped openings 66D are provided in the side surface portion 66C. The external airflow passes through the opening 66D and reaches the outer peripheral surface of the recess 66A. When a fire occurs, the heat from the airflow is easily transmitted to the low-melting alloy 67 accommodated inside the recess 66A.

An annular insulating material 68 is disposed between the recess 66A and the lower end of the balancer 63, and the heat of the fire transmitted to the cylinder 66 is prevented from being transmitted to the balancer 63 by the heat insulating material 68. The hole 65C described above can be formed 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 provided between the heat insulating material 68 and the concave portion 66A. The heat-sensitive plate 69 is formed of copper or a copper alloy, and heat absorbed on the surface is easily transmitted to the low-melting alloy 67 inside the concave portion 66A.

Next, the operation of the sprinkler head S of Fig. 1 will be described based on Fig. 6 . Fig. 6 (a) to (d) are diagrams showing the operation of the sprinkler head S.

(a) In the monitoring state of the sprinkler head S, the pressurized fire water is supplied to the nozzle 11 of the body 1, and the pressure of the fire water is applied to the valve body 3 (Fig. 6(a)).

(b) A fire occurs, and when the hot air flows against 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 periphery to start melting, the molten low melting point alloy 67 flows out from the gap formed between the plunger 65 and the recessed portion 66A of the cylinder 66, and its volume is reduced (Fig. 6 (Fig. 6 ( b)).

When the low melting point alloy 67 is melted and flows out to the outside of the concave portion 66A, the cylinder 66 is lowered in such a manner as to correspond 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 provided on the cylinder 66 are lowered (Fig. 6(b)).

When the balancer 63 is lowered, the gap between the balancer 63 and the slider 62 is enlarged. The ball 61 biased in the central axis direction (inside) passes over the segment portion 63A of the balancer 63 and moves inward, and the engagement of the segment portion 22 of the frame 2 with the ball 61 is released.

When the thermal decomposition unit 6 performs the disassembly operation and the constituent elements move, that is, when the balls 61 are separated from the segment portion 22 and the combined circular spring 5 and the thermal decomposition portion 6 are lowered, the main circular spring 51 and the auxiliary circle are borrowed. The spring 52 is restored to the bending deformation in the unloaded state, and the valve body 3 is pressed by the nozzle end 11a to maintain the closed state of the nozzle 11. In other words, between the main circular spring 51 and the auxiliary circular spring 52, the amount of bending (displacement amount) remaining from the loaded state compressed into a flat shape to the unloaded state remains, and the valve body 3 continues to be loaded, and the valve is applied. The body 3 can plug the nozzle 11 to the thermal decomposition portion 6 to completely fall. At this time, the auxiliary circular spring 52 compensates for the amount of bending caused by the bending deformation of the main circular spring 51 in accordance with the amount of bending caused by the bending deformation thereof. In this manner, according to the sprinkling head S including the main circular spring 51 and the auxiliary circular spring 52, the large bending amount obtained by the combination of these can absorb the constituent elements of the thermal decomposition portion 6 at the time of the decomposition operation. The amount of movement is such that the valve body 3 can be stably held at the nozzle end 11a between the melting of the low melting point alloy 67 and the action of the sprinkler head S.

Here, the main circular spring 51 is in contact with the valve body 3, and the auxiliary circular spring 52 is in contact with the slider 62. When the thermal decomposition unit 6 is operated obliquely (see FIG. 6(b)), the auxiliary circular spring 52 is displaced from the axis of the auxiliary circular spring 52 by the inclination of the slider 62. However, since the outer edge of the main circular spring 51 is in contact with the inner inclined surface 52D of the outer peripheral portion 52A of the auxiliary circular spring 52, the excessive displacement of the axial center of the main circular spring 51 can be suppressed by the frictional resistance. The spring piece portion 51B of the main circular spring 51 is in contact with the front end of the peripheral wall 34 projecting from the bottom surface of the valve body 3, and the valve body 3 can be stably biased with the main circular spring 51 and the auxiliary circular spring 52. .

(c) When the thermal decomposition unit 6 disposed under the valve body 3 is dropped, the combined circular spring 5 and the valve body 3 are lowered. At that time, since the auxiliary circular spring 52 has a small amount of bending and a low height in the no-load state, the state in which the head portion 64B of the fixing screw 64 of the thermal decomposition portion 6 is still inserted is lowered. The main circular spring 51 is then assisted by the circular spring 52, and the head portion 64B of the fixing screw 64 of the thermal decomposition portion 6 is still inserted or released from the head portion 64B and lowered to the outside of the frame 2. Since the outer diameter of the main circular spring 51 is smaller than that of the auxiliary circular 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 attached to the deflector 41 and the pin 43 are lowered. When the pin 43 is lowered, the flange portion 43A located at the upper portion thereof is locked to the guide ring 42, and the guide ring 42 is locked to the segment portion 22 of the frame 2, and the borrowing pin 43 suspends the valve body 3 and the deflector 41 from the frame 2. State.

(d) When the valve body 3 is lowered as described above, the nozzle 11 is opened, and the pressurized fire water collides with the deflector 41, and is scattered toward the square to eliminate the fire (Fig. 6(d)).

Modification of the embodiment

In the above-described embodiment, an example in which the main circular spring 51 is provided on the valve body 3 side and the auxiliary circular spring 52 is provided on the thermal decomposition portion 6 side is exemplified. On the other hand, when the main circular spring 51 having a large amount of bending is disposed on the side of the thermal decomposition portion 6 and the auxiliary circular spring 52 is disposed on the valve body 3 side, the main circular spring 51 is in the operation of the sprinkling head S. It may be difficult to hook the segment 22 of the frame 2. Specifically, during the operation of the sprinkler head S, the main circular spring 51 is detached from the frame 2 in an unloaded state. At that time, since the cross-sectional shape of the main circular spring 51 is a funnel shape or a mortar shape, the main circular spring 51 is detached in an inclined state, and the outer peripheral portion 51A contacts the segment portion 22, and the outer peripheral portion 51A is difficult to hook the segment portion. twenty two. Further, since the amount of bending of the auxiliary circular spring 52 is small, the thermal decomposition unit 6 is inclined when the sprinkler head S is operated, and the auxiliary circular spring 52 on the valve body 3 side is hardly inclined, and the action on the valve body 3 can be suppressed. The overall load bias of the combined circular spring 5 is combined.

In the above-described embodiment, the auxiliary circular spring 52 shown in Fig. 4 is exemplified, but the auxiliary circular spring 53 according to the modification shown in Fig. 7 may be used. The auxiliary circular spring 53 is formed to be higher as it goes from the outer circumferential side toward the center, and has an outer diameter substantially the same as that of the auxiliary circular spring 52 of the above-described embodiment. A plurality of slits 53A formed in a circular arc shape are formed between the outer edge of the auxiliary circular spring 53 and the through hole 53C through which the head 64B of the fixing screw 64 is inserted. The corners of the inner edge of the slit 53A have rounded corners to avoid concentration of stress. The spring piece portion 53B between the plurality of slits 53A is a position where the load is elastically deformed by bending when the load is applied to the auxiliary circular spring 53. In addition to the auxiliary circular spring 53 shown in FIG. 7, the auxiliary spring 58 (, 53) is also provided with a lower load height than the main circular spring 51, and has a larger diameter than the main circular spring 51, and As long as the height at the time of no load is a shape closer to the flatness than the main circular spring 51, it can be used as an auxiliary circular spring.

Claims (3)

 A sprinkler head includes: a body having a nozzle inside; a valve body that closes an outlet of the nozzle; and a thermal decomposition portion that maintains a closed state of the valve body and performs decomposition by melting of a low-melting alloy And characterized in that the main circular spring is disposed between the thermal decomposition portion and the valve body, and absorbs the movement of the constituent elements of the thermal decomposition portion during the decomposition operation by bending deformation, and maintains the borrowing The closed state of the valve body; and the auxiliary circular spring is disposed to overlap the main circular spring and has a bending amount for supplementing the bending deformation of the main circular spring The amount of bending.    The sprinkler head of claim 1, wherein an outer diameter of the auxiliary circular spring is formed to be larger than an outer diameter of the main circular spring; the outer edge of the main circular spring is placed on the auxiliary The bevel of the circular spring.    A sprinkler head according to claim 1 or 2, wherein the auxiliary circular spring has a smaller amount of bending than the main circular spring.