JP5901728B2 - Sprinkler head - Google Patents

Description

  The present invention relates to a sprinkler head.

  A conventional sprinkler head includes, for example, a head body having a water outlet, a frame connected to the head body, a valve body provided in the frame and closing the water outlet, and a valve body support mechanism for supporting the valve body (For example, refer to Patent Document 1). The valve body support mechanism of this sprinkler head is composed of several members, and solder is provided at the lower end. When this solder melts, the valve body support mechanism is disassembled and the support of the valve body is released. It has come to be. In addition, a flat heat-sensitive plate is attached to the cylinder that houses the solder in order to promote melting of the solder.

JP-A-8-308953

  In the sprinkler head of Patent Document 1, a heat sensitive plate is provided at the lowermost end of the sprinkler head. For this reason, when something hits the sprinkler head, it hits the heat sensitive plate. The heat sensitive plate is made of a thin metal plate and has a low strength. Therefore, when an external force is applied, the heat sensitive plate is easily deformed, and a situation occurs in which the plunger bites into the heat sensitive plate. The thermal plate is configured to operate by melting of solder or the like, but if it is coupled with the plunger, the gap where solder or the like flows out is blocked or the coupling force prevents the thermal plate from descending. There is a risk of causing the problem. For these reasons, it has been desired to develop a sprinkler head having a structure resistant to impact.

The sprinkler head according to the present invention includes a head body having a water outlet, a valve body provided at a lower end or inside of the water outlet, a frame provided at a lower portion of the head body, and provided in the frame. In the sprinkler head having a valve body support mechanism for supporting the valve body, the frame includes a locking step portion for locking the valve body support mechanism at a lower portion, and the valve body support mechanism has a flange portion at a lower portion. A cylindrical plunger having a flange, a heat-sensitive body provided on the flange of the plunger, a heat-sensitive plate cover that is in contact with the heat-sensitive body and formed in a bowl shape and has an opening, and provided in the heat-sensitive plate cover A plate-like heat sensitive plate that directly or indirectly contacts the heat sensitive body, and the heat sensitive plate has an outer diameter substantially equal to an inner diameter of the engaging step portion of the frame, and a peripheral portion of the heat sensitive plate. Thermal plate cover Of the so as to be positioned in the height direction of extent of the opening, the peripheral portion is to said that you have exposed through the opening portion of the heat plate cover.

  According to the sprinkler head according to the present invention, since the flat plate-like heat sensitive body is covered with the heat sensitive plate cover, it is not deformed even when an external force is applied, and a sprinkler head having a structure resistant to impact is realized. . Further, since the peripheral edge of the heat sensitive plate is exposed to the hot air flow through the opening of the heat sensitive plate cover, the heat sensitive plate can be efficiently exposed to the heat current and promote the heating of the solder.

It is a longitudinal cross-sectional view of the sprinkler head which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the operation state of a sprinkler head. It is sectional drawing which showed the detail of the plunger of FIG. It is a top view of a disc spring, a front view, a side view, a perspective view, and an EE sectional view. It is the perspective view and front view of a stopper ring and its periphery. It is a longitudinal cross-sectional view of the sprinkler head which concerns on Embodiment 2 of this invention. It is a disassembled perspective view of the sprinkler head of FIG. It is sectional drawing of the plunger of FIG. FIG. 7 is a plan view, a front view, and a CC sectional view of the heat sensitive plate cover of FIG. 6. It is the perspective view (state seen from the downward direction) and front view of the slider of FIG. FIG. 7 is a plan view, a front view, a side view, a perspective view, and an EE cross-sectional view of the disc spring of FIG. 6. It is sectional drawing which shows the operation state of the sprinkler head shown in FIG. It is the elements on larger scale which show the modification of a heat sensitive part. It is the elements on larger scale which show the other modification of a heat sensitive part. It is the elements on larger scale of a plunger provided with a heat insulation member.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view of a sprinkler head according to Embodiment 1 of the present invention.
The sprinkler head 1 includes a head body 10, a frame 20, a valve body 30, a water sprinkling unit 40, and a valve body support mechanism 50 (ball holding mechanism 60).

  The head body 10 has an opening at the center. The opening 11 forms a water discharge port 12 together with a water discharge tube 16 described later. A flange 13 is formed on the outer peripheral portion of the head main body 10, and a screw portion 14 connected to the water supply pipe is formed on the outer peripheral portion of the head main body 10 on the upper side of the flange 13. A screw portion 15 for attaching a frame 20 to be described later is formed on the outer peripheral portion on the side.

  A cylindrical water discharge cylinder 16 is formed on the inner side of the head body 10 so as to protrude downward. Further, for example, a flat valve seat 17 is formed at the lower end of the water discharge cylinder 16 and is closed by the valve body 30. You may make it provide the step part which the outer periphery of the valve body 30 fits in the lower end part of this water discharge pipe | tube 16. As shown in FIG. In the head body 10, a substantially hole-shaped or ring-shaped space 18 is formed between the lower inner peripheral portion of the flange 13 and the water discharge cylinder 16, and a guide rod 42 described later is formed in the space 18. Is stored.

  The frame 20 is formed in a cylindrical shape. A screw portion 21 is formed on the inner peripheral portion of the upper portion of the frame 20 and is attached to the screw portion 15 formed on the lower side of the head body 10. A locking step portion 22 protruding inward is provided at the lower portion of the frame 20, and a ball 61 described later is locked to the locking step portion 22.

  The valve body 30 is formed in a convex shape, and has a flange portion 31 at the lower portion. The flange portion 31 closes the valve seat 17 of the head body 10. The valve seat 17 is provided with a Teflon (registered trademark) sheet or a Teflon (registered trademark) coating. A recess 32 is formed at the lower center of the valve body 30 and a head of a set screw 65 described later is inserted. The valve body 30 is supported by a valve body support mechanism 50 described later.

  The water sprinkling unit 40 includes a deflector 41, a guide rod 42, and a stopper ring 43 (and the valve body 30).

  The deflector 41 is configured by a disc having an opening at the center, and is attached (fixed) to the lower surface of the flange portion 31 of the valve body 30 with the lower portion of the valve body 30 inserted into the opening. ing). The deflector 41 is provided with insertion holes 41a (for example, three) into which guide rods 42 (for example, three) are inserted, and the lower end of the guide rod 42 protrudes from the insertion hole 41a. 41 is fixed. Therefore, the valve body 30, the deflector 41, and the guide rod 42 are integrally formed.

Here, the attachment state of the deflector 41 to the valve body 30 will be described in detail.
The valve body 30 is in contact with the valve seat 17 and has a flange portion 31 for maintaining water stop, and a cylindrical leg portion protruding below the flange portion 31. The upper part is a groove part slightly smaller in diameter than the central opening (hole) of the deflector 41, and the lower side of the groove part is a cylindrical shape slightly larger in diameter than the hole diameter of the central opening part of the deflector 41. For this reason, the deflector 41 is in a rotatable state at a connection location (groove portion) to the valve body 30.

  A stepped portion 42a having an enlarged diameter for a stopper is formed at the upper end of the guide rod 42, and a stopper ring 43 formed in a donut shape is attached to the guide rod 42 so as to be movable up and down (see FIG. 5). ).

  The stopper ring 43 is provided with insertion holes (for example, three) through which the guide rod 42 is inserted. By the insertion holes, the stopper ring 43 slides on the guide rod 42 during the water discharge operation. The guide rod 42 is attached so as to be movable to the stop portion 22. In other words, the guide rod 42 is attached to the stopper ring 43 so as to be movable downward along the insertion hole of the stopper ring 43 during the water discharge operation. In addition, this insertion hole is formed smaller than the step part 42a. The stopper ring 43 is normally installed on the deflector 41 and is provided at a position that is substantially in the middle of the frame 20 in the height direction and that faces a slit provided in the frame 20. The slit does not necessarily have to be provided at a position facing the stopper ring 43.

  Under normal conditions, the lower surface of the stopper ring 43 is pressed by the coil spring 44 and substantially overlaps the upper surface of the deflector 41. However, during the water discharge operation, the deflector 41 and the guide rod 42 are lowered, and the upper end of the guide rod 42 is lowered. The stepped portion 42a descends until it hits the stopper ring 43 (see FIG. 2C). The outer diameter of the stopper ring 43 is formed to be larger than the inner diameter of the locking step portion 22 of the frame 20, and when the valve body support mechanism 50 falls during the water discharge operation, the stopper ring 43 is pushed by the coil spring 44 and the frame. It descends to 20 locking steps 22.

  The coil spring 44 has a size (outer diameter) so as to contact the inner peripheral surface of the frame 20, and is provided between the lower part of the outer peripheral part of the head body 10 and the outer peripheral part of the stopper ring 43. Therefore, a large space is not required for installing the coil spring 44.

  The inner diameter of the hole provided in the center of the stopper ring 43 is slightly larger than the outer diameter of the water discharge cylinder 16. The stopper ring 43 is provided with guide members 43a having an L-shaped cross section, for example, at three locations on the inner peripheral side by bending a part of the inner periphery upward through a notch groove. When the stopper ring 43 is lowered, the stopper ring 43 is guided by the guide member 43a to the outer periphery of the water discharge cylinder 16 formed in the lower portion of the head body 10. The number and pitch of the guide members 43a are appropriately set so that the stopper ring 43 can be lowered in a balanced manner.

The valve body support mechanism 50 includes a heat sensitive part 51, a ball holding mechanism 60, a disc spring 64, and a set screw 65.
The heat sensitive unit 51 includes a plunger 52, a heat sensitive plate 53, and a heat insulating material 54.

  The plunger 52 is formed in a cylindrical shape, and a flange portion 52a is formed in the lower portion. Further, the lower surface of the flange portion 52 a is formed so as to protrude from the lower surface of the heat sensitive plate 53. Inside the plunger 52, a female screw 52b is formed, and a male screw on a leg portion of the set screw 65 is screwed to couple them together. A donut-shaped heat sensitive body (for example, solder) 55 is inserted from the upper portion of the plunger 52 and is placed on the flange portion 52 a of the plunger 52. A heat sensitive plate 53 having a disc shape and having a crank section is provided on the heat sensitive member 55. That is, the heat sensitive plate 53 includes a protrusion 53 a that covers the heat sensitive body 55 provided on the flange portion 52 a of the plunger 52, and a direction that is continuous with the protrusion 53 a and perpendicular to the axis of the head body 10. And an extended disc portion 53b. A force is applied to the heat sensitive plate 53 so as to compress the heat sensitive member 55 by a ball holding mechanism 60 described later.

  A donut-shaped heat insulating material 54 is provided on the top of the heat sensitive plate 53 so that heat received by the heat sensitive plate 53 does not escape to the balancer 63 side described later. As shown in FIG. 1, another heat sensitive plate 71 having a large diameter may be provided between the heat insulating material 54 and the heat sensitive plate 53 as necessary.

  The ball holding mechanism 60 includes a ball 61, a slider 62, a balancer 63, and a disc spring 64. Since the balancer 63 has a function of compressing the heat sensitive body 55, it functions as a piston.

  The lower outer periphery of the ball 61 is locked to the locking step 22 of the frame 20. In this state, it is the slider 62 that presses the ball 61 from above, and when a force is applied from the slider 62 to the ball 61, a force acts on the ball 61 in the direction of entering the inside.

  The balancer 63 is provided inside the ball 61, and regulates the movement of the ball 61 trying to enter the inside of the ball 61. Both the slider 62 and the balancer 63 are formed in a disk shape, and there is a through hole in the center, and the plunger 52 passes through the through hole of the balancer 63. The outer diameter of the plunger 52 is slightly smaller than the inner diameter of the through hole of the balancer 63, and the two are not coupled. Further, the inner diameter of the through hole of the slider 62 is slightly larger than the outer diameter of the leg portion of the set screw 65, and the two are not coupled.

  The balancer 63 has a shape in which a cylindrical portion having a through hole and a disk portion provided above the cylindrical portion are combined. A step portion is formed at the lower outer periphery of the balancer 63. The step portion at the lower outer periphery is configured to contact the step portion at the lower inner periphery of the locking step portion 22 of the frame 20, and when an external force is applied from below the balancer 63 Absorb the shock at the part. Further, a stepped portion 63a into which the heat insulating material 54 is fitted protrudes from the lower portion of the cylindrical portion of the balancer 63 around the central through hole, and the ball 61 hits the ball 61 at the upper portion of the disc portion of the balancer 63. The step 63b is formed so as to protrude.

  A concave portion 62a is formed in the lower part on the outer peripheral side of the slider 62, and the surface of the concave portion 62a that contacts the ball 61 is formed in a tapered shape (inclined portion) so as to be inclined inwardly downward.

  As described above, since force is applied to the ball 61 so as to always move inward, the force acts to move the balancer 63 downward and the slider 62 upward. Therefore, if the solder which is the heat sensitive body 55 melts and flows out, the balancer 63 moves downward, and accordingly, the ball 61 enters inside, and the locked state with the locking step portion 22 of the frame 20 is released. Therefore, the ball holding mechanism 60 falls together with the heat sensitive part 51. If the ball holding mechanism 60 falls, the valve body 30, the stopper ring 43, etc. which comprise the water sprinkling part 40 will fall in connection with it, and water discharge will be performed.

  The set screw 65 is a bolt composed of an enlarged head portion and a narrow leg portion, and the lower portion of the leg portion is coupled to the upper portion of the plunger 52, whereby the balancer 63 as the ball holding mechanism 60. The slider 62 and the heat sensitive part 51 are integrated.

  As shown in FIG. 4, a disc spring 64 having a through hole 64a at the center is used. In addition, slits 64b are provided radially from the central through hole 64a at equal intervals of 60 °. A through hole 64c is provided between the slits 64b. For example, three disc springs 64 are combined in the vertical direction, and are arranged between the valve body 30 and the slider 62. The details of the disc spring 64 will be described later.

  The disc spring 64 is provided between the valve body 30 and the slider 62 by inserting the set screw 65 into the through hole 64 a. That is, the through hole 64a of the disc spring 64 is formed to be approximately the same as or slightly larger than the outer diameter of the head of the set screw 65. Further, the height of the head of the set screw 65 is formed to be larger than the free height of the plurality of stacked disc springs 64, and serves as a guide when the disc springs 64 are overlapped. If the height of the head of the set screw 65 is low, it will not function if the disc spring 64 is crushed more than necessary at the time of assembly. Therefore, the height of the head of the set screw 65 is set to such an extent that such a situation does not occur. By doing so, it becomes possible to hold the disc spring 64 in a stable state.

  In the sprinkler head 1 as described above, in the state of FIG. 1, the water pressure of the fire extinguishing water at the outlet 12 and the assembly load of the parts act on the ball 61, and the ball 61 tends to move inward (center side). However, the movement of the ball 61 is blocked by the balancer 63, and the ball holding mechanism 60 holds the ball. In this state, the disc spring 64 presses the valve body 30 upward, and the valve body 30 seals the water outlet 12 of the head body 10. For this reason, although the fire extinguishing water pressurized is supplied to the sprinkler head 1, the fire extinguishing water does not leak. Further, in the water sprinkling unit 40, the deflector 41 is fixed to the valve body 30, and the guide rod 42 is fixed to the deflector 41. When the valve body 30 seals the water outlet 12, the guide rod 42 is the head. The main body 10 is housed in the space 18.

Next, the operation of the sprinkler head 1 of FIG. 1 will be described.
FIGS. 2A to 2D are diagrams showing an operation process of the sprinkler head 1.

  (A) In the monitoring state of the sprinkler head 1, pressurized fire extinguishing water is supplied to the water outlet 12 of the head body 10, and the pressure of the fire extinguishing water is applied to the valve body 30 (FIG. 1). reference). When a fire occurs and the hot airflow hits the heat sensitive plate 53, the heat is heated, and the heat of the heat sensitive plate 53 propagates to the heat sensitive body 55. When the heat sensitive body 55 is heated from the surroundings and starts to melt, the melted heat sensitive body 55 flows out from the gap formed between the plunger 52 and the heat sensitive plate 53 (projection 53a) and the volume thereof decreases. (FIG. 2A).

  At this time, the ball 61 pushed from above by the balancer 63 moves inward, but even if the ball 61 moves, the valve body 30 is pressed against the valve seat 17 and maintains the state where the water outlet 12 is blocked. To do. This is due to the action of the disc spring 64, and by stacking a plurality of disc springs 64, the disc spring 64 has a predetermined stroke enough to maintain the seal by the valve body 30. In this way, the valve body 30 is prevented from being separated from the valve seat 17 until the ball holding mechanism 60 is completely dropped, so that it can operate reliably.

  (B) When the heat sensitive body 55 melts and flows to the outside, the heat sensitive plate 53 descends in accordance with the outflow amount of the heat sensitive body 55. When the heat sensitive plate 53 is lowered, the heat insulating material 54 and the balancer 63 attached on the heat sensitive plate 53 are lowered. When the balancer 63 is lowered, a gap between the balancer 63 and the slider 62 is widened, and the ball 61 biased inward moves inward beyond the stepped portion 63b of the balancer 63, and the locking stepped portion of the frame 20 is moved. The engagement between the ball 22 and the ball 61 is released. Thereby, the valve body 30 and the valve body support mechanism 50 are lowered (FIG. 2B).

(C) When the valve body support mechanism 50 including the disc spring 64 disposed under the valve body 30 is dropped, the valve body 30 is lowered. As the valve body 30 is lowered, the deflector 41 attached to the valve body 30, the guide rod 42 attached to the deflector 41, and the stopper ring 43 are lowered. When the guide rod 42 is lowered, the step portion 42a at the top thereof is locked to the stopper ring 43, the stopper ring 43 is locked to the locking step portion 22 of the frame 20, and the valve body 30 and the deflector 41 are connected to the guide rod 42. Thus, it is suspended from the frame 20 (FIG. 2C). In this operation, the stopper ring 43 is lowered together with the guide rod 42 until the stopper ring 43 is engaged with the engagement step portion 22, and only the guide rod 43 is further lowered after the stopper ring 43 is engaged.
In the present embodiment, during the water discharge operation, the deflector 41 descends together with the guide rod 42 while being guided by the guide member 43a, so that the deflector 41 is smoothly lowered. Further, by providing the stopper ring 43 substantially in the middle of the frame 20 in the height direction, the amount of lowering of the stopper ring 43 itself can be reduced, so that the operation at the time of water discharge becomes smooth.

  By the way, the guide member 43a of the stopper ring 43 is bent upward, so that it is unlikely to cause a watering trouble at the time of water discharge. Explaining this point, some of the conventional guide members are bent downward. In this case, if the length of the guide member is long or thick, the water hitting the valve body is reflected when the water is discharged. For example, when the guide member is exposed to water, the guide member becomes an obstacle to watering. That is, by bending the guide member 43a upward and separating the distance from the valve body 30 at the time of water discharge, the guide member 43a can be prevented from becoming a watering obstacle.

  (D) When the valve body 30 is lowered as described above, the water outlet 12 is opened, and the fire extinguishing water pressurized is sprayed from the deflector 41 to extinguish the fire (FIG. 2 (d)).

  Next, the characteristic parts of the plunger 52, the slider 62, and the disc spring 64, which are parts constituting the sprinkler head of the present invention, will be described in detail.

(Plunger 52)
FIG. 3 is a cross-sectional view showing details of the plunger 52.
As described above, the plunger 52 of FIG. 1 is provided such that its tip protrudes downward from the heat sensitive plate 53. When the corresponding part is extracted from FIG. 1, it becomes as shown in FIG. 3, but when something hits the sprinkler head 1 (particularly from below), the plunger 52 protrudes in this way. The object hits the plunger 52, and it is avoided that the object hits the heat sensitive plate 53. Since the plunger 52 is composed of a member whose rigidity is higher than that of the heat sensitive plate 53, there is no risk of deformation. For this reason, there is no possibility that the plunger 52 bites into the heat sensitive plate 53, and malfunction does not occur.

  Further, the plunger 52 has an upper end portion extending to the upper end of the balancer 63 (see FIG. 1), and the set screw 65 is coupled to the plunger 52, so that rigidity is high. For this reason, even if an external force is applied to the sprinkler head 1 from the lateral direction, there is no possibility that the plunger 52 or the set screw 65 is deformed, and no malfunction occurs. In particular, the stepped portion at the lower outer periphery of the balancer 63 is locked to the stepped portion at the lower inner peripheral portion of the locking stepped portion 22, so that the external force received from the lateral direction and the downward direction is strong against the frame. It is transmitted to 20.

(Slider 62)
First, a configuration required for the sprinkler head 1 having the ball holding mechanism 60 including the slider 62 and the ball 61 will be described. If the valve body 30 is separated from the valve seat 17 before the ball 61 is completely removed from the locking step portion 22 of the frame 20, there is a possibility of inactivation due to water leakage during operation. A residual load that supports the valve body is required. Further, in order to ensure the remaining load, it is necessary to suppress the descending amount of the slider 62 (referred to as an operation stroke). For this reason, conventionally, by using a spring having a large amount of displacement such as a coil spring, the amount of displacement of the coil spring is made larger than the operating stroke of the slider 62 to prevent water leakage during operation.

  In the present invention, by changing the shape of the slider 62, the operating stroke of the slider 62 is reduced, and by devising the shape of the disc spring 64, the amount of displacement of the disc spring itself is increased and the coil spring is bulky. It was made to avoid using.

  Here, returning to FIG. 1, focusing on the shape of the slider 62, the surface of the recess 62 a on the outer peripheral side of the slider 62 that contacts the ball 61 is tapered, and this tapered surface is in contact with the ball 61. .

  By adopting such a shape for the slider 62, when the ball 61 enters the inside of the slider 62 and rides on the balancer 63, the amount of movement (operation stroke) in the axial direction of the slider 62 is on the inside of the slider 62. The amount of displacement required for the disc spring 64, that is, the ball 61 is completely removed from the latching step portion 22 as compared with the case where the recess is not provided and is flat (conventional example). The stroke required to keep the body 30 in pressure contact with the valve seat 17 can be reduced.

(Belleville spring 64)
Next, the disc spring 64 of FIG. 1 will be described.
4A, 4B, 4C, 4D, and 4E are a plan view, a front view, a side view, a perspective view, and an EE cross-sectional view of a disc spring.

  The disc spring 64 is provided with a through hole 64a in the center, and six radial slits 64b are provided so as to be continuous with the through hole. Between the slits, a fan-shaped (triangular and circular arc-shaped) through hole 64c is provided.

  The disc spring 64 is provided with the six slits 64b as described above. However, if the number of the slits 64b is as small as four (conventional example), the stress increases and the disc spring breaks. There is a problem that buckling is likely to occur over time. Further, when there are 10 or more slits 64b (conventional example), there are problems that the load is insufficient, the bending amount is insufficient, and the disc spring does not return to its original shape. For this reason, in the present embodiment, the number of slits 64b is set to six, for example.

  Further, the through hole 64c is provided between the slits 64b, in order to reduce the stress applied to the disc spring 64. If there is no through hole 64c between the slits 64b, there is a problem that a high stress is generated, the disc spring is broken, and a crack is generated.

  The through hole 64c between the slits has a triangular shape and a circular arc shape (fan shape). This is to disperse the stress applied to each part. If the shape of the through hole is a long hole or a square as in the conventional case, the stress is not dispersed, and the disc spring is broken when a large load is applied.

The advantages of the disc spring 64 will be described from another point of view.
The disc spring 64 is divided into a portion that receives a load and a bent portion that is formed on the inner peripheral portion (center side). The portion receiving the load corresponds to the outer peripheral portion (peripheral portion) of the disc spring, and the bent portion corresponds to the shape of the slit portion. By changing these two parts in a well-balanced manner, the disc spring can be set to an arbitrary load and deflection amount. Further, since the stress is dispersed, no cracking or buckling occurs. For this reason, both high load and high displacement, which cannot be achieved by the conventional disc spring, are achieved.

  In this embodiment, a disc spring is used that has a lotus root cross-sectional shape composed of radial slits and through holes provided between the slits to ensure an assembly load and a stroke required for water stoppage. However, the shape of the disc spring used for the sprinkler head is not limited to this shape. For example, as long as it has a stroke necessary for the assembly load and water stoppage and takes into consideration corrosion resistance, one to a plurality of similar disc springs may be used in combination in a timely manner.

[Embodiment 2]
6 is a longitudinal sectional view of a sprinkler head according to Embodiment 2 of the present invention, and FIG. 7 is an exploded perspective view of the sprinkler head of FIG. In these drawings, the same reference numerals as those in FIG. 1 have the same names and functions, and differences from the above embodiment will be mainly described. In FIG. 7, the coil spring 44 is not shown.

(Head body 10)
The connection between the head body 10 and the frame 20 is such that the head body 10 is provided with an internal thread, the frame 20 is provided with an external thread, and the external thread of the frame 20 is engaged with the internal thread of the head body 10 so that both are connected. ing. For this reason, in the connection relationship between the head main body 10 and the frame 20, the relationship between the male screw and the female screw is opposite to that of the embodiment of FIG.

(Valve 30)
The valve body 30 of the sprinkler head is the same in that there is a recess in which the upper part of the set screw 65 is accommodated below the valve body 30, but between the disc spring 64 inserted into the set screw 65 and the valve body 30. Is provided with a washer B. The washer B is a donut-shaped disk having a predetermined thickness. On the lower surface of the deflector 41 of the water sprinkling part 40, as shown in FIG. 5, the lower end of the guide lot 42 and the wings (claws) of the deflector 41 bent down below the part facing the guide rod 42 are protruding parts. Since the washer B is provided, the protruding portion of the lower surface of the deflector 41 is received by the upper surface of the washer B, and an equal force is applied to the disc spring 64.

(Watering part 40)
The sprinkler head sprinkler 40 has the same basic configuration as that of the embodiment of FIG. 1, but a coil spring 44 is mounted between the upper portion of the space 18 of the head body 10 and the stopper ring 43. This is different from the example of FIG.

(Plunger 52)
FIG. 8 is a cross-sectional view of the plunger 52 of the valve body support mechanism 50.
The plunger 52 of the valve body support mechanism 50 is provided such that its tip protrudes downward from the heat sensitive plate cover 80. When an object hits the sprinkler head 1 (particularly from below), the plunger 52 protrudes in this way, so that the object hits the plunger 52 and the object hits the heat sensitive plate cover 80. can avoid. Since the plunger 52 is composed of a member whose rigidity is higher than that of the heat sensitive plate cover 80, there is no risk of deformation. For this reason, there is no possibility that the plunger 52 bites into the heat sensitive plate cover 80, and the malfunction does not occur.

  Further, the plunger 52 has an upper end portion extending to the upper end of the balancer 63 (see FIG. 6), and the set screw 65 is coupled to the plunger 52, so that the rigidity is high. For this reason, even if an external force is applied to the sprinkler head 1 from the lateral direction, there is no possibility that the plunger 52 or the set screw 65 is deformed, and no malfunction occurs. In particular, the stepped portion at the lower outer periphery of the balancer 63 is locked to the stepped portion at the lower inner peripheral portion of the locking stepped portion 22, so that the external force received from the lateral direction and the downward direction is strong against the frame. It is transmitted to 20.

  Further, the plunger 52 is provided with a taper (chamfered C surface) 52f at the lower end of the flange portion 52a. Even if the lower end of the plunger 52 is deformed by an external force from below and obliquely below, the lower end of the flange 52a has a smaller diameter than the upper portion of the flange 52a. The deformed portion blocks the gap 52d, and the plunger 52 and the heat sensitive plate cover 80 are engaged with each other due to the deformation, so that there is no possibility of coupling, and the operability is not affected.

(Thermal plate cover 80)
9A, 9B, and 9C are a plan view, a front view, and a CC sectional view of the heat sensitive plate cover 80, respectively.
The heat sensitive plate cover 80 is different from the first preferred embodiment in that the heat sensitive plate 53 of the first embodiment is formed in a bowl shape so as to cover the heat sensitive plate 71 on the upper side. That is, the heat sensitive cover 80 is formed in a bowl shape on the lower side, the upper part is opened, and an opening 80a through which the plunger is inserted is formed at the center. Further, a slit-like opening 80b for taking outside air into the heat sensitive plate 71 is formed on the peripheral wall. The heat sensitive plate cover 80 accommodates the heat sensitive plate 71, and the opening 80b of the heat sensitive plate 71 is positioned so that the peripheral portion of the heat sensitive plate 71 is located at the center in the height direction. 6), the hot air flow is configured to directly touch the peripheral edge of the heat sensitive plate 71. As described above, the outer diameter of the heat sensitive plate 71 is substantially equal to the diameter of the inner peripheral side of the locking step portion 22 of the frame 20 so that the hot airflow that has passed through the opening 80b directly hits.

  6 and 7, the heat sensitive plate 71 is formed in a flat plate shape, and is thermally connected to the heat sensitive body 55 through the outer portion of the opening 80 a of the metal heat sensitive cover 80. . The heat sensitive plate 71 is accommodated in the heat sensitive plate cover 80 as described above. Note that the heat sensitive plate 71 only needs to be able to transfer heat to the heat sensitive body 55. If this is possible, the heat sensitive plate 71 may be in contact with the heat sensitive body 55 either directly or indirectly.

  The heat sensitive plate cover 80 is made of a metal member, and its lower portion is formed so as to wrap the heat sensitive member 55 in the same manner as the heat sensitive plate 71 of FIG. 1 and is in contact with the heat sensitive member 55 (see FIGS. 6 and 8). Also functions as a heat sensitive plate. The heat sensitive plate cover 80 plays a role of protecting the heat sensitive plate 71 from an external force. When the same material as that of the heat sensitive plate 71 is used, its thickness is increased. For example, when the plate thickness of the heat sensitive plate 71 is 0.05 mm to 0.1 mm, the plate thickness of the heat sensitive plate cover 80 is set to 0.2 mm to 0.3 mm.

  The height of the opening 80b of the heat sensitive plate cover 80 is designed so that the lower side of the opening 80b is substantially the same height as the upper surface of the heat sensitive body 55 or below it. The width of the opening 80b is formed larger than the outer diameter of the doughnut-shaped heat sensitive body 55 (that is, the outer diameter of the plunger 52). Thereby, the hot airflow which passed the opening part 80b accelerates | stimulates the heating of the heat sensitive body 55. FIG.

  The heat sensitive plate cover 80 can send a hot air current to the heat sensitive plate 71 as the area of the opening 80b is larger or the number of the heat sensitive plate covers 80b is larger. In the present embodiment, the opening portion 80b has a balance between facilitating ease of use and the ability to withstand external force (strength increases) as the beam (column) formed between the opening portion and the opening portion increases. Are provided at equal intervals.

(Slider 62)
FIGS. 10A and 10B are a perspective view and a front view of the slider 62 of the ball holding mechanism 60. The slider 62 according to the first embodiment is formed by cutting the lower surface of a flat plate over the entire circumference to form a recess 62 a that is a contact surface of the ball 61. On the other hand, the slider 62 of the second embodiment is obtained by pressing a flat plate. That is, only the portion of the contact surface with the ball 61 is bent obliquely upward to form the recess 62a.

  A washer A is provided between the slider 62 and the disc spring 64. The washer A is composed of a donut-shaped thin disk. The reason for providing the washer A is that the contact portion with the ball 61 on the outer periphery of the slider 62 is bent upward, so that the distance between the disc spring 64 and the slider 62 is maintained according to the inclination. This is to make it function.

(Belleville spring 64)
11A to 11E are a plan view, a front view, a right side view, a perspective view, and an EE cross-sectional view of the disc spring 64, respectively.
The disc spring 64 includes an outer peripheral portion 64e and a protruding portion 64f protruding from the outer peripheral portion 64e toward the center. The outer peripheral portion 64e functions to receive a load, and the projecting portion 64f is configured to function as a deflection (amount of displacement). As shown in the figure, the protrusion 64f has substantially the same width (parallel), and its root is formed in an arc shape. The distance between the tips of the protrusions 64f is the same length as the diameter of the through hole 64a in FIG. Further, the disc spring 64 is formed so as to become higher toward the center, and is configured to be sandwiched between the washer A and the washer B (see FIG. 6). By configuring in this way, a force equivalent to the configuration of the disc spring 64 itself is applied, so that even if three conventional disc springs are required, for example, a single disc spring 64 performs the same function. It is possible to get.

(Set screw 65)
The head of the set screw 65 is accommodated in the recess 32 on the bottom surface of the valve body 30. In the first embodiment, the gap between the outer periphery of the head of the set screw 65 and the inner periphery of the recess 32 of the valve body 30 is very small. However, in this embodiment, a large gap 32A is formed (see FIG. 6). Furthermore, the head end surface of the set screw 65 is formed in a spherical shape, and the spherical portion is in contact with the bottom surface of the recess 32.

  The disc spring 64 inserted through the head of the set screw 65 has an outer peripheral edge on the valve element 30 side and an inner peripheral edge on the slider 62 side.

  These configurations are for allowing the set screw 65 to tilt inside the recess 32. That is, as shown in FIG. 12B, when the ball holding mechanism 60 is tilted and operated, the head of the set screw 65 is a spherical portion, so that the frictional resistance with the bottom surface of the recess 32 of the valve body 30 is reduced. Is done. Further, by providing a gap 32A between the head of the set screw 65 and the recess 32 of the valve body 30, the set screw 65 can be inclined inside the recess 32, whereby the set screw 65 holds the ball. It is easy to follow the tilt of the mechanism 60. When the disc spring 64 is restored from the compressed state to the no-load state, the washer B is prevented from being tilted by absorbing the tilt of the ball holding mechanism 60. Thus, even when the set screw 65 is tilted, the closed state of the valve body 30 is maintained, so that the valve body 30 is opened and the water of the head main body 10 does not leak from the water discharge tube 16 until the ball holding mechanism 60 is removed from the frame 20. It has become.

  The sprinkler head 1 configured as described above operates in the same manner as in FIGS. 2 (a) to 2 (d) above when the hot airflow hits the heat sensitive plate 71 and the heat sensitive plate cover 80 in the event of a fire. Water is sprayed from 41 to extinguish the fire.

  Next, the operation of the sprinkler head 1 of the second embodiment will be described. Since the basic operation is the same as the description of the first embodiment (paragraphs 0027 to 0030), the operation based on the configuration unique to the second embodiment will be mainly described. FIGS. 12A to 12D are diagrams showing the operation process of the sprinkler head 1.

(A) In the first embodiment, a fire occurs, and the hot airflow hits the heat sensitive plate 53 and is heated and propagates to the heat sensitive body 55. On the other hand, in the present embodiment, the heat sensitive plate 71 and the heat sensitive plate cover 80 are heated against the hot airflow, so that the heat is transmitted to the heat sensitive body 55.
When the heat sensitive body 55 starts to melt, the melted heat sensitive body 55 flows out from the gap formed between the plunger 52 and the heat sensitive plate cover 80 and the volume thereof decreases.

  At this time, the ball 61 pushed from above by the balancer 63 and the slider 62 receives a force to move inward. As will be described later, even if the balancer 63 descends toward the thermal plate cover 80 and the ball 61 moves, the valve 61 moves. The body 30 is pressed against the valve seat 17 and maintains a state where the water outlet 12 is closed. This is due to the action of the disc spring 64. The disc spring 64 is formed so as to become higher toward the center, and the disc spring 64 is configured to be sandwiched between the washer A and the washer B. This is because the stroke has a predetermined amount that can maintain the seal by the valve body 30. In this way, the valve body 30 is prevented from being separated from the valve seat 17 until the ball holding mechanism 60 is completely dropped, so that it can operate reliably.

  (B) When the heat sensitive body 55 is melted and flows out, the heat sensitive plate cover 80 is lowered according to the amount of the heat sensitive body 55 flowing out. When the heat sensitive plate cover 80 is lowered, the heat insulating material 54 and the balancer 63 attached on the heat sensitive plate cover 80 are lowered. When the balancer 63 is lowered, a gap between the balancer 63 and the slider 62 is widened, and the ball 61 biased inward moves inward beyond the stepped portion 63b of the balancer 63, and the locking stepped portion of the frame 20 is moved. The engagement between the ball 22 and the ball 61 is released. Thereby, the valve body 30 and the valve body support mechanism 50 are lowered (FIG. 12B).

  (C) When the valve body support mechanism 50 including the washer B, the disc spring 64, and the washer A disposed under the valve body 30 is dropped, the valve body 30 is lowered. As the valve body 30 is lowered, the deflector 41 attached to the valve body 30, the guide rod 42 attached to the deflector 41, and the stopper ring 43 are lowered (FIG. 12C).

  (D) When the guide rod 42 is lowered, the stepped portion 42a at the top thereof is locked to the stopper ring 43, the stopper ring 43 is locked to the locking stepped portion 22 of the frame 20, and the valve body 30 and the deflector 41 are The guide rod 42 is suspended from the frame 20.

  When the valve body 30 is lowered as described above, the water outlet 12 is opened, and the pressurized fire extinguishing water is sprayed through the deflector 41 to extinguish the fire (FIG. 12 (d)).

Modification of Embodiment [FIGS. 13 to 15]
In each embodiment of the present invention, the embodiment has been described with a sprinkler head that supports a valve body by a valve body support mechanism provided with a ball holding mechanism by a ball, a slider, and a balancer. However, in general, solder that is a heat sensitive body is compressed. The present invention may be applied to a flash-type sprinkler head having a typical piston, for example, a lever-type sprinkler head in which a valve body support mechanism is constituted by a pair of arms.

  Moreover, although the valve body was press-contacted to the valve seat in the lower end of a water discharge cylinder, you may make it provide a valve body inside a water discharge cylinder.

  Although only the stopper ring is attached to the guide rod in a slidable state, the deflector may be attached to be slidable with respect to the guide rod.

  Although an example in which the slit-like opening 80b is provided on the peripheral wall of the heat-sensitive plate cover 80 of the second embodiment is shown, it can be configured as a heat-sensitive plate 53 without the opening 80b as shown in FIG. In addition, although embodiment which does not have the heat sensitive board 71 is illustrated in FIG. 13, you may make it provide the heat sensitive board 71. FIG.

  Moreover, although Embodiment 2 provided with the heat sensitive board 71 was shown in Embodiment 2, as shown in FIG. 14, it can also be comprised as an embodiment which is not provided with the heat sensitive board 71. FIG.

  In the above-described embodiment, an example is shown in which a hole is formed in the plunger 52 and it opens to the outside. However, as shown in FIG. 15, a heat insulating member 81 that closes the hole can be provided. By providing the heat insulating member 81 that closes the hole of the plunger 52 in this way, it is possible to reinforce the thinned portion of the plunger 52 and to have a heat insulating effect, thereby ensuring the sensitivity performance. it can.

  The heat insulating member 81 is installed so as to protrude from the end face of the plunger 52. For this reason, when an object collides from the lower part, it can make it easy to touch the heat insulation member 81 which protrudes most, and the plunger 52 and the heat sensitive plate 53 which influence the operation | movement at the time of fire extinguishing can be prevented as much as possible.

  The heat insulating member 81 shown in FIG. 15 may also be installed on the plunger 52 of the second embodiment. The heat insulating member 81 can be formed of a hard material, for example, a hard resin. The plunger 52 only needs to be provided with either a heat sensitive plate or a heat sensitive plate cover, and the shape of the heat sensitive plate cover does not have to be formed in a bowl shape.

DESCRIPTION OF SYMBOLS 1 Sprinkler head, 10 Head main body, 11 Opening part, 12 Water discharge port, 13 Flange, 14, 15 Screw part, 16 Water discharge pipe, 17 Valve seat, 18 Space, 20 Frame, 21 Screw part, 22 Locking step part, 30 Valve body, 31 flange part, 32 concave part, 40 water spray part, 41 deflector, 41a insertion hole, 42 guide rod, 42a step part, 43 stopper ring, 43a guide member, 44 coil spring, 50 valve body support mechanism, 51 heat sensitive part , 52 Plunger, 52a Flange, 52b Female thread, 53 Heat sensitive plate, 54 Thermal insulation, 55 Heat sensitive body, 60 Ball holding mechanism, 61 Ball, 62 Slider, 62a Recessed part, 63 Balancer, 64 Disc spring, 65 Set screw, 71 Thermal plate, 80 Thermal plate cover.

Claims (6)

A head body having a water outlet;
A valve body provided at the lower end or inside of the water outlet;
A frame provided at a lower portion of the head body;
In the sprinkler head provided in the frame and having a valve body support mechanism for supporting the valve body,
The frame includes a locking step portion that locks the valve body support mechanism at a lower portion,
The valve body support mechanism is
A cylindrical plunger having a flange at the bottom;
A heat sensitive body provided on the flange of the plunger;
A thermal plate cover in contact with the thermal body, formed in a bowl shape, and having an opening;
A plate-shaped heat sensitive plate provided in the heat sensitive plate cover and in direct or indirect contact with the heat sensitive body;
The thermal plate is
The outer diameter is substantially equal to the inner diameter of the locking step of the frame,
A peripheral edge is positioned within a range in the height direction of the opening of the heat sensitive plate cover,
Sprinkler head wherein the peripheral portion is characterized that you have exposed through the opening of the heat sensitive plates cover. A head body having a water outlet;
A valve body provided at the lower end or inside of the water outlet;
A frame provided at a lower portion of the head body;
In the sprinkler head provided in the frame and having a valve body support mechanism for supporting the valve body,
The frame includes a locking step portion that locks the valve body support mechanism at a lower portion,
The valve body support mechanism is
A cylindrical plunger having a flange at the bottom;
A heat sensitive body provided on the flange of the plunger;
A thermal plate cover in contact with the thermal body, formed in a bowl shape, and having an opening;
A plate-shaped heat sensitive plate provided in the heat sensitive plate cover and in direct or indirect contact with the heat sensitive body;
The thermal plate cover is
The position of the lower side of the opening is below the upper surface of the heat sensitive body,
The thermal plate is
The outer diameter is substantially equal to the inner diameter of the locking step of the frame,
Sprinkler head wherein the peripheral portion is characterized that you have exposed through the opening of the heat sensitive plates cover. A head body having a water outlet;
A valve body provided at the lower end or inside of the water outlet;
A frame provided at a lower portion of the head body;
In the sprinkler head provided in the frame and having a valve body support mechanism for supporting the valve body,
The frame includes a locking step portion that locks the valve body support mechanism at a lower portion,
The valve body support mechanism is
A cylindrical plunger having a flange at the bottom;
A heat sensitive body provided on the flange of the plunger;
A thermal plate cover in contact with the thermal body, formed in a bowl shape, and having an opening;
A plate-shaped heat sensitive plate provided in the heat sensitive plate cover and in direct or indirect contact with the heat sensitive body;
The thermal plate cover is
The position of the lower side of the opening is above the end face of the heat sensitive body in contact with the plunger,
The thermal plate is
The outer diameter is substantially equal to the inner diameter of the locking step of the frame,
Sprinkler head wherein the peripheral portion is characterized that you have exposed through the opening of the heat sensitive plates cover. 4. The plunger according to claim 1, wherein a taper surface is provided at a lower end of the flange portion, and a lower end of the flange portion is shaped to have a smaller diameter than an upper portion of the flange portion . The sprinkler head according to one item . The plunger has a peripheral wall portion having a hole inside,
Installing a heat insulating member in the hole of the plunger;
The sprinkler head according to any one of claims 1 to 4, wherein the heat insulating member has a protruding portion protruding from an end surface of the plunger. The heat sensitive body is formed in a donut shape,
The width of the opening of the heat sensitive plate cover is formed to be larger than the outer diameter of the heat sensitive member, and any one of claims 4 and 5 dependent on claim 2, 3 and 2, 3. The sprinkler head described in the item .

Images