JP2019055027A - Sprinkler head - Google Patents

Abstract

To provide a sprinkler head enabling reducing deflection required for a disc spring used in a thermosensitive decomposition part.SOLUTION: A sprinkler head is configured such that: a pressure receiving part 4a of a valve body 4, and a pressing part 17c of a pressing body 17 are formed so as to make one part to a projecting surface and the other part to a recessed surface; and both projecting surface and recessed surface are formed so as to have height changing surfaces 4b,17d for changing a height of the surface from the center side to the outer peripheral side, and are formed so as to move contact points to each other along the height changing surfaces 4b,17d from the center side to the outer peripheral side with the inclination of the pressing part 17c of the pressing body 17 by using the contact points as support points.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fire extinguishing sprinkler head.

  The fire extinguishing sprinkler head automatically opens when it detects the heat from a fire and sprays water from the nozzle to extinguish the fire.

  In this sprinkler head, the valve body that normally closes the nozzle is supported and held in the closed position, while in the event of a fire, the heat is sensed and disassembled to release the valve body and move it to the open position. It has a support mechanism (hereinafter, this mechanism is referred to as a “thermal decomposition section”). Note that a low melting point alloy is used for detecting the heat of the fire, and the thermal decomposition portion is decomposed by melting of the low melting point alloy.

  In the thermal decomposition part, when the low melting point alloy starts melting in the event of a fire, the thermal decomposition part starts to move toward decomposition. At that time, if the valve body is moved away from the closed position before being disassembled, water leaks from the nozzle, and the low melting point alloy is cooled by the water, so that the melting is delayed or stopped. become.

  The thermal decomposition part is provided with a spring member that applies a strong load in the closing direction to the valve body. Even if the thermal decomposition part starts to be displaced, if the displacement is within the range of the deflection (displacement) of the spring member, a residual load in the closing direction can be applied to the valve body, and the valve body is held in the closed position. be able to. That is, if a spring member having a deflection that absorbs a displacement during decomposition in the thermal decomposition section is used, it is possible to prevent water from leaking from the nozzle.

  As the spring member, a disc spring can be used as previously proposed by the present patent applicant (see Patent Document 1). If a disc spring is used, a strong load can be applied to the valve body in the closing direction, but the mounting space can be reduced.

  By the way, in most cases, the thermal decomposition section decomposes while tilting due to a change in the part where solder starts to melt depending on the dimensional error or assembly error of parts, or the position of the fire source. Even when disassembling while tilting, it is preferable that the disc spring can uniformly apply a load in the closing direction to the valve body. For example, as proposed previously by the present patent applicant, if the load of the disc spring is to be applied through the spherical head of the pressing member, even when the thermal decomposition portion is inclined and decomposed, A load in the closing direction of the disc spring can be uniformly applied to the valve body (see Patent Document 2).

JP 2012-105952 A JP 2014-144153 A

  In the thermal decomposition part, as described above, a disc spring is used as a spring member that gives a strong load in the closing direction to the valve body, and as a spring member that has a deflection that absorbs the displacement during the decomposition in the thermal decomposition part. By using the disc spring, it is possible to apply a strong load to the valve body in the closing direction and reduce the mounting space.

  However, in the case of a spring member used not only in a disc spring but also in a thermal decomposition part, it is assumed that it has a resilient force that gives a strong load (for example, 80 kgf), and the degree of increasing the deflection is 1 mm. Even if it is below, its design is very difficult.

  In view of the above circumstances, an object of the present invention is to provide a sprinkler head that can reduce the deflection required for the spring member used in the thermal decomposition section.

  In the present invention, a heat-sensitive decomposing unit that normally supports a valve body that closes a nozzle and holds the valve body in a closed position, detects and decomposes the heat in a fire, and releases the valve body to move to an open position. In the sprinkler head, the thermal decomposition portion is provided so as to be movable in the vertical direction, and has a pressing body provided with a pressing portion that comes into contact with the pressure receiving portion of the valve body from below, and has a vertical elastic force. A spring member that applies a load to the closing position to the valve body from below, and applies an upward load to the pressing body to press the pressure receiving portion of the valve body from below by the pressing portion, A spring member that applies a load from below to the valve body via a pressing body, and one of the pressure receiving portion of the valve body and the pressing portion of the pressing body is convex and the other is concave. As well as any of its convex and concave surfaces Is formed as having a height changing surface that changes the height of the surface from the center side to the outer peripheral side, and when the thermal decomposition portion is disassembled in the event of a fire, The sprinkler head is characterized in that, as the pressing portion is inclined, the contact point is formed so as to move along the height change surface from the center side to the outer peripheral side.

  Here, the terms indicating the positional relationship such as “up” and “down” used to describe the present invention correspond to the positional relationship when the sprinkler head is downward (nozzle is downward). That is, if the orientation of the sprinkler head changes, it will change corresponding to the positional relationship. For example, if the sprinkler head faces upward, “up” changes to “down” and “down” changes to “up”.

  Further, the present invention is the sprinkler head, wherein the pressure receiving portion of the valve body and the pressing portion of the pressing body are both formed with the change surface as a curved surface and / or an inclined surface.

  Further, according to the present invention, the pressure receiving portion of the valve body and the pressing portion of the pressing body are all formed as a curved surface including the change surface, and the radius of curvature is more concave than the convex surface side. It is a sprinkler head characterized by being larger.

  Moreover, this invention is a sprinkler head characterized in that the pressure receiving portion of the valve body is a convex surface and the pressing portion of the pressing body is a concave surface.

  In the present invention, the valve body that normally closes the nozzle is supported and held in the closed position, while in the event of a fire, the heat is sensed and disassembled, and the valve body is released and moved to the open position. In the sprinkler head having the thermal decomposition part, the thermal decomposition part is provided so as to be movable in the vertical direction, and from above the pressure receiving part provided on the holding member side that holds the thermal decomposition part in an assembled state. A pressing body provided with a pressing portion to be contacted, and a spring having an upward and downward elastic force, and applying a load to the closing position to the valve body from below and applying a load to the holding position to the holding member from above A member that applies a downward load to the pressing body, presses the pressure receiving portion on the holding member side from above by the pressing portion, and applies a load to the holding position on the holding member via the pressing body. Spring member given from above The pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed such that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface are on the outer peripheral side from the center side. In the event of a fire, when the thermal decomposition part is disassembled, the pressure receiving part on the holding member side tilts with the mutual contact point as a fulcrum. The sprinkler head is characterized in that the contact point is formed so as to move along the height change surfaces from the center side to the outer peripheral side.

  Further, the present invention is the sprinkler head characterized in that the pressure receiving portion on the holding member side and the pressing portion of the pressing body are both formed with the change surface as a curved surface and / or an inclined surface.

  Further, according to the present invention, the pressure receiving portion on the holding member side and the pressing portion of the pressing body are all formed as a curved surface including the change surface, and the radius of curvature is more concave than the convex surface. Is a sprinkler head characterized by a large

  The present invention is the sprinkler head, wherein the pressure receiving portion on the holding member side is a concave surface, and the pressing portion of the support is a convex surface.

  In the present invention, the pressure receiving portion of the valve body and the pressing portion of the pressing body are formed such that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface are from the center side to the outer peripheral side. It is formed as a surface having a height changing surface that changes the height of the surface, and when the thermal decomposition portion is disassembled in the event of a fire, the contact is centered as the pressing body tilts with each other as a fulcrum. When the thermal decomposition part is tilted in the event of a fire, the pressure receiving part of the valve body that serves as a fulcrum of the tilt is formed by moving from the side to the outer peripheral side along the height change surface. A contact point with the pressing portion of the pressing body moves along the height change surface from the center side to the outer peripheral side. Thereby, a press body can be moved below with respect to a valve body, and can be moved in the direction which makes the bending of a spring member small.

  In the present invention, the pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed such that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface are formed from the center side. It is formed to have a height changing surface that changes the height of the surface on the outer peripheral side, and when the thermal decomposition part is disassembled in the event of a fire, the contact is centered as it tilts with each other's contact as a fulcrum As described above, when the thermal decomposition part is tilted in the event of a fire, the holding member side that serves as a fulcrum of the tilt is formed by moving from the outer peripheral side to the outer peripheral side along the height change surface. The contact point between the pressure receiving portion and the pressing portion of the pressing body moves along the height change surface from the center side to the outer peripheral side. Thereby, a press body can be moved upwards with respect to the holding member side, and can be moved in the direction which makes the bending of a spring member small.

  Therefore, according to the present invention, the pressure receiving portion of the valve body and the pressing portion of the pressing body or the pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed as a convex surface and a concave surface, so that it is used in the heat-sensitive decomposition portion. It is possible to provide a sprinkler head that can reduce the deflection required for the spring member.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the sprinkler head of this invention is shown, (a) in a normal state is a whole longitudinal cross-sectional view, (b) is a partially expanded view. FIG. 4 is a view showing the same embodiment, in which (a) is a whole longitudinal sectional view and (b) is a partially enlarged view in a state in which a thermal decomposition part is being decomposed in a fire. It is explanatory drawing which showed a mode that a contact point moved on the concave surface which is a press part of the set pin (an example of a support body) in embodiment same as the above. FIG. 4 is a longitudinal sectional view showing the embodiment of the above, in a state where the thermal decomposition portion is decomposed and dropped, the valve body is released and moved to an open position, and water is discharged from the nozzle. FIGS. 2A and 2B illustrate a second embodiment, in which FIG. 1A corresponds to FIG. 1A and FIG. 1B corresponds to FIG. FIGS. 3A and 3B illustrate a third embodiment, in which FIG. 1A corresponds to FIG. 1A and FIG. 1B corresponds to FIG. FIGS. 2A and 2B show the above-described embodiment, in which FIG. 2A corresponds to FIG. 2A and FIG. 2B corresponds to FIG. The other four examples of the pressure receiving part of the valve body and the pressing part of the set pin are shown, and (a) to (d) are enlarged vertical sectional views of only the valve body and the set pin.

  An embodiment of a sprinkler head according to the present invention will be described with reference to FIGS. In addition, in this invention, things other than a disc spring can also be used as a spring member, for example, a leaf | plate spring can be used.

[First Embodiment]
First, the sprinkler head 1-1 of 1st Embodiment is demonstrated based on FIG. 1 thru | or FIG.

[Basic configuration]
The sprinkler head 1-1 supports the valve body 4 and holds it in the closed position while being always positioned below the valve body 4 and the head body 3 having the nozzle 2 and the valve body 4 for opening and closing the nozzle 2. On the other hand, in the event of a fire, it has a thermal decomposition section 5 that senses and decomposes the heat and releases the valve body 4 to move it to the open position (see FIG. 1). Although details will be described later, a low melting point alloy 11 (for example, solder) is used for the thermal decomposition unit 5 as a component that senses the heat of the fire, and the thermal decomposition unit 5 includes the low melting point alloy. 11 decomposes by melting.

[Head body]
The head main body 3 has a threaded portion 3a with a pipe for supplying fire-extinguishing water on the outer periphery on the upper side, and a cylindrical frame 6 that supports the thermal decomposition unit 5 on the lower side. (See FIG. 1).

[Valve]
The valve body 4 is provided so as to be movable in the vertical direction, and is normally supported by the thermal decomposition unit 5 and located above the closed position and provided at the periphery of the water outlet 2a of the nozzle 2. While holding the seated state on the valve seat portion 2b (see FIG. 1), in the event of a fire, when the thermal decomposition portion 5 is disassembled and the support thereby is released, it moves downward to the open position. The water outlet 2a of the nozzle 2 is opened, and the fire-extinguishing water W can be discharged from the nozzle 2 (see FIG. 4). Although details will be described later, a pressure receiving portion 4 a that contacts the thermal decomposition portion 5 is provided on the lower surface of the valve body 4.

[Thermal decomposition part]
In the case of this embodiment, the thermal decomposition part 5 shall be equipped with the some ball | bowl 10 (an example of a holding member) arrange | positioned circularly as a member holding the assembly state. Normally, the assembled state is maintained by holding the plurality of balls 10 in a predetermined position, and the state in which the valve body 4 is held in the closed position is maintained. On the other hand, in the event of a fire, the lower part of the thermal decomposition unit 5 is maintained. When the low melting point alloy 11 provided in the melted, it is decomposed.

  Specifically, the thermal decomposition part 5 includes a heat collecting part 12 having a concave part 12a in the central part, and a filling part that is inserted into the central opening of the concave part 12a from below and filled with the low melting point alloy 11 together with the concave part 12a. And a plunger 13 having a flange portion 13a that is formed in an annular shape. In addition, a slider 14 that supports the ball 10 from above and a balancer 15 that supports the ball 10 from below is provided above the heat collecting unit 12 and the flange 6 a provided on the frame 6 of the head body 3. Further, the disc spring 16 is placed on the slider 14 in the vertical direction, and is inserted into the central opening of the disc spring 16 from above, so that the disc spring 16 has an upward spring force. And a set pin 17 (an example of a pressing body) that is movable in the vertical direction. The plunger 13 is inserted from below into the central opening of the recess 12 a of the heat collecting section 12 and then through the central opening of the balancer 15, and the upper part thereof reaches the central opening of the slider 14, where the slider 14 Screwed together. Further, the set pin 17 is inserted through the central opening of the disc spring 16 from above and is inserted through the upper opening of the plunger 13 so as to be movable in the vertical direction.

  In the thermal decomposition unit 5, the set pin 17 has a flange 17 b that receives an upward elastic force of the disc spring 16 on a head portion 17 a that protrudes upward from the central opening of the disc spring 16. The upper surface of 17a has the press part 17c which contacts the pressure receiving part 4a provided in the lower surface of the valve body 4. FIG. If the normal assembly state is maintained, the set pin 17 is loaded in the closing direction by the pressing portion 17c pressing the pressure receiving portion 4a of the valve body 4 by the elastic force of the disc spring 16 upward. To hold the valve body 4 in the closed position. In the present embodiment, the pressing portion 17c is described as forming a substantially circular arc in sectional view, but the shape is not limited thereto as described later.

  Here, the slider 14 has the support part 14a which contacts the ball | bowl 10 from upper direction on the lower surface. The balancer 15 has a step portion 15a that comes into contact with the flange portion 6a of the frame 6 from below when the normal low melting point alloy 11 is not melted. The ball 10 is held at three points: a flange portion 6 a of the frame 6, a step portion 15 a of the balancer 15, and a support portion 14 a of the slider 14. Thereby, the thermal decomposition part 5 is always maintained in an assembled state (see FIG. 1). On the other hand, when the low melting point alloy 11 is melted in the event of a fire, the balancer 15 moves downward along the outer peripheral surface of the plunger 13 together with the lower heat collecting portion 12, and the balancer 15 and the slider 14 are opened. As a result, the ball 10 moves inward as the balancer 15 descends, and the ball 10 is held at three points: the flange portion 6a of the frame 6, the step portion 15a of the balancer 15, and the pressing portion 14a of the slider 14. It is gradually released, and the thermal decomposition unit 5 gradually releases the state in which the assembled state is maintained (see FIG. 2). When the ball 10 enters the inside of the flange portion 6a of the frame 6, the ball 10 gets over the flange portion 6a and falls downward, and the thermal decomposition portion 5 is decomposed and falls downward. Thereby, the state in which the valve body 4 is held at the closed position by the thermal decomposition unit 5 is released, and as described above, the valve body 4 moves downward as the open position to open the water outlet 2a of the nozzle 2, The fire extinguishing water W can be released from 2 (see FIG. 4).

  In the sprinkler head 1-1, as shown in detail in the enlarged views of FIGS. 1B and 2B, one of the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 is convex. The other is formed as a concave surface, and both the convex surface and the concave surface are formed as having height changing surfaces 4b and 17d that change the height of the surface from the center side to the outer peripheral side. ing. Further, as the set pin 17 is tilted with the mutual contact point P as a fulcrum, the contact point P is formed to move along the height change surfaces 14b and 17d from the center side to the outer peripheral side.

  When the thermal decomposition unit 5 decomposes while tilting in the event of a fire, as shown in FIGS. 2A and 2B, the contact point P between the pressure receiving unit 4a of the valve body 4 and the pressing unit 17c of the set pin 17 is provided. As a fulcrum, the portion below the set pin 17 is inclined. At that time, the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 are formed as a convex surface and a concave surface as described above, so that the contact point P is accompanied by the inclination of the pressing portion 17c of the set pin 17. Then, it moves along the height changing surfaces 4b and 17d from the center side to the outer peripheral side, and moves to the side where the vertical dimension on the concave surface becomes larger. Specifically, in the present embodiment in which the pressing portion 17c of the set pin 17 is a concave surface, the contact P is, for example, on the concave surface from the position P1 on the center side as shown in detail in the explanatory view of FIG. By moving to the position P2 on the outer peripheral side, the dimension in the vertical direction moves to the larger side by X.

  The set pin 17 moves downward with respect to the upper valve body 4 when the contact P is inclined with the contact P as a fulcrum due to the movement of the contact P on the concave surface toward the side having the larger vertical dimension. Therefore, the disc spring 16 moves in the direction of reducing the deflection h.

  Accordingly, in the sprinkler head 1-1, the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 are formed as a concave surface and a convex surface as described above, so that the dish used in the thermal sensitive decomposition portion 5 is used. The deflection h required for the spring 16 can be reduced. That is, the design of the disc spring 16 can be facilitated.

  The contact point P also moves along the height changing surface of the pressure receiving portion 4a, which is the convex surface of the valve body 4, so that the set pin 17 moves downward exactly the same as the height difference X shown in FIG. Do not mean. However, by increasing the X, it is possible to move the disk spring 16 in the direction of decreasing the deflection h.

  In the present embodiment, the pressure receiving portion 4a of the valve body 4 is formed as a convex surface, and the pressing portion 17c of the set pin 17 is formed as a concave surface. Further, the pressure receiving portion 4a of the valve body 4 formed as a convex surface and the pressing portion 17c of the set pin 17 formed as a concave surface are formed as a curved surface having an arcuate cross section including the height change surfaces 4b and 17d. Normally, the top 4c on the convex side, which is the center of each other, and the bottom 17e on the concave side are in contact with each other, and the contact P is formed there. Further, the pressing portion 17c of the set pin 17 formed as a concave surface is formed as a curved surface having a larger curvature radius than the pressure receiving portion 4a of the valve body 4 formed as a convex surface. These surface shapes can be appropriately changed as will be described in detail later.

[Second Embodiment]
Next, the sprinkler head 1-2 of 2nd Embodiment is demonstrated based on FIG.

  The sprinkler head 1-2 of the present embodiment is obtained by reversing the convex surface and the concave surface of the first embodiment with respect to the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17. That is, as shown in FIGS. 5A and 5B, the pressure receiving portion 4a of the valve body 4 is formed as a concave surface, while the pressing portion 17c of the set pin 17 is formed as a convex surface. It is intended. Other configurations are the same as those in the sprinkler head 1-1.

  Also in this sprinkler head 1-2, the deflection h required for the disc spring 16 can be reduced as in the first embodiment. However, regarding the uniformity of the residual load in the closing direction that acts on the valve body 4 when the thermal decomposition portion 5 is tilted, the first embodiment has the pressure receiving portion 4a of the valve body 4 formed as a convex surface. Since the pressing portion 17d of the set pin 17 formed as a concave surface is pressed from the outer peripheral side toward the center side, the residual load in the closing direction can be more uniformly applied to the valve body 4, which is advantageous.

  Also in this embodiment, the pressure receiving portion 4a of the valve body 4 formed as a concave surface and the pressing portion 17c of the set pin 17 formed as a convex surface are entirely cross-sectional circles including the height change surfaces 4b and 17d. It is assumed that it is formed as an arcuate curved surface, and normally the top 17f on the convex side and the bottom 4d on the concave side, which are the center of each other, are in contact with each other, and the contact P is formed there. Furthermore, the pressure receiving portion 4a of the valve body 4 formed as a concave surface is formed as a curved surface having a larger curvature radius than the pressing portion 17c of the set pin 17 formed as a convex surface.

[Third Embodiment]
Next, the sprinkler head 1-3 of 3rd Embodiment is demonstrated based on FIG.6 and FIG.7.

  The sprinkler head 1-3 of the present embodiment is replaced with a set pin 17 instead of providing a portion serving as a fulcrum when the thermal decomposition unit 5 is tilted between the valve body 4 and the set pin 17 as in the above embodiment. And the plunger 13. Hereinafter, parts different from the above-described embodiment will be described. For convenience of explanation, the same reference numerals as those in the above-described embodiment are used except for additional parts.

  In the sprinkler head 1-3, as shown in FIGS. 6A and 6B, the disc spring 16 is interposed between the pressure receiving portion 4a of the valve body 4 and the flange 17b of the set pin 17 via a washer 18. The set pin 17 is provided with the head portion 17a facing downward. The plunger 13 penetrates the upper portion of the slider 14 while being screwed with the central opening of the slider 14. The pressing portion is provided on the upper surface of the upper end portion 13 b protruding upward and on the lower surface of the head portion 17 a of the set pin 17. A pressure receiving portion 13c (an example of a pressure receiving portion on the holding member side) that 17c contacts from above is provided.

  That is, in the sprinkler head 1-3, the thermal decomposition unit 5 assumes that the disc spring 16 is positioned between the pressure receiving portion 4 a of the valve body 4 and the flange 17 b of the set pin 17, and the disc spring 16 moves upward. A load is applied to the valve body 4 from below via the washer 18 to the closed position, and a load is applied to the holding position from above via the set pin 17, the plunger 13 and the slider 14 to the lower ball 10. Yes. Further, as shown in FIGS. 7A and 7B, when the thermal decomposition portion 5 is tilted, the plunger 13 or lower is used with the contact point P between the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 as a fulcrum. The part of is assumed to be inclined.

  And the thermal decomposition part 5 makes the pressing part 17c of the set pin 17 and the pressure receiving part 13c of the plunger 13 have convex surfaces and other concave surfaces, as in the above embodiment, and the convex and concave surfaces. Both have height changing surfaces 17d and 13d that change the height of the surface from the center side to the outer peripheral side.

  Also in this sprinkler head 1-3, the deflection h required for the disc spring 16 used in the thermal decomposition part 5 can be made small like the said embodiment.

  That is, in the case of this embodiment, as described above, the components below the plunger 13 are inclined with the contact point P between the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 as a fulcrum. At that time, the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 are formed as a convex surface and a concave surface as described above, so that the pressure receiving portion 13c of the plunger 13 is the fulcrum. The contact P moves from the position on the center side to the position on the outer peripheral side along the height change surfaces 17d and 13d. And in this embodiment which makes the pressure-receiving part 13c side of the plunger 13 into a concave surface, the contact P moves on the concave surface from the position on the center side to the position on the outer peripheral side, and moves in the direction with the larger vertical dimension. To do. As a result, when the set pin 17 is tilted with the contact P as a fulcrum, the set pin 17 moves upward with respect to the plunger 13 and moves in a direction to reduce the deflection h of the disc spring 16, which is necessary for the disc spring 16. The deflection h can be reduced.

  Also in the present embodiment, the pressure receiving portion 13c of the plunger 13 formed as a concave surface and the pressing portion 17c of the set pin 17 formed as a convex surface, including the height changing surfaces 13d and 17d, are entirely arc-shaped in cross section. In the usual case, the convex top 17f and the concave bottom 13e, which are the center of each other, are in contact with each other, and the contact P is formed there. Furthermore, the pressure receiving portion 13c of the plunger 13 formed as a concave surface is formed as a curved surface having a larger curvature radius than the pressing portion 17c of the set pin 17 formed as a convex surface.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, A various change is possible.

  For example, as for the convex and concave surface shapes of the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 in the first embodiment, the height change surfaces 4b and 17d are inclined instead of curved surfaces. It can have a surface. Moreover, it can have a plane or a curved surface as the top part 4c or the bottom part 17e of a center part. Specifically, if the pressing portion 17c of the set pin 17 on the concave surface side in the first embodiment is exemplified, as shown in FIG. 8A, the height changing surface 17d has an inclined surface, The bottom portion 17e can have a flat surface. That is, it can be continuous from one side to the other side in the radial direction as an inclined surface, a plane, or an inclined surface. Further, as shown in FIG. 8B, the height changing surface 17d may have an inclined surface that reaches the center. That is, it can be continued as an inclined surface / inclined surface from one side to the other side in the radial direction. Moreover, as shown in FIG.8 (c), while having a slope as the height change surface 17d, it can have a curved surface as the bottom part 17e. That is, it can be continuous as an inclined surface / curved surface / inclined surface from one side to the other side in the radial direction. Further, as shown in FIG. 8D, the height changing surface 17d may have a curved surface and the bottom portion 17e may have a flat surface. That is, it can be continuous in a radial direction from one side to the other as a curved surface, a plane, or a curved surface.

  When the convex and concave surface shapes of the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 are inclined surfaces or flat surfaces, the curvature radius of each convex surface is the curvature of the circumscribed circle. As the radius, the concave side can be compared with each other as the radius of curvature of the inscribed circle, and the concave side can be larger.

  Moreover, the modified example of the convex surface / concave surface in the first embodiment can also be applied to the convex surface / concave surface in the second embodiment and the third embodiment.

1-1: Sprinkler head 1-2: Sprinkler head 1-3: Sprinkler head 2: Nozzle 2a: Water outlet 2b: Valve seat part 3: Head body 3a: Screwing part 4: Valve body 4a: Pressure receiving part 4b: High 4c: Top 4d: Bottom 5: Thermal decomposition 6: Frame 6a: Flange 10: Ball
11: Low melting point alloy 12: Heat collecting part 12a: Concave part 13: Plunger
13a: Flange 13b: Upper end portion 13c: Pressure receiving portion 13d: Height change surface 13e: Bottom portion 14: Slider 14a: Pressing portion 15: Balancer
15a: Step 16: Disc spring 17: Set pin 17a: Head
17b: Flange 17c: Pressing part 17d: Height change surface 17e: Bottom part 17f: Top part 18: Washer P: Contact point h: Deflection W: Fire extinguishing water

Claims (8)

A sprinkler head having a thermal decomposition part that normally supports the valve body that closes the nozzle and holds it in the closed position, and detects and decomposes the heat in the event of a fire, and releases the valve body to move it to the open position. In
The thermal decomposition part is provided so as to be movable in the vertical direction, and a pressing body provided with a pressing part that comes into contact with the pressure receiving part of the valve body from below,
A spring member that has a resilient force in the vertical direction and applies a load to the closing position to the valve body from below, and applies an upward load to the pressing body and receives pressure of the valve body by the pressing portion. A spring member that presses the portion from below, and applies a load from below to the valve body through the pressing body,
The pressure receiving portion of the valve body and the pressing portion of the pressing body are formed such that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface have a surface height from the center side to the outer peripheral side. In the event of a fire, when the thermal decomposition part is disassembled, the contact part is centered as the pressing part of the pressing body tilts with each other's contact point as a fulcrum. A sprinkler head, characterized in that the sprinkler head is formed so as to move along the height change surface from the side to the outer peripheral side.   2. The sprinkler head according to claim 1, wherein each of the pressure receiving portion of the valve body and the pressing portion of the pressing body has the change surface formed as a curved surface and / or an inclined surface.   The pressure receiving portion of the valve body and the pressing portion of the pressing body are all formed as a curved surface including the change surface, and the radius of curvature is larger on the concave side than on the convex side. The sprinkler head according to claim 1.   The sprinkler head according to any one of claims 1 to 3, wherein the pressure receiving portion of the valve body is a convex surface, and the pressing portion of the pressing body is a concave surface. A heat-sensitive decomposition unit that normally supports the valve body that closes the nozzle and holds the valve body in the closed position, detects and decomposes the heat in the event of a fire, and releases the valve body to move to the open position. In sprinkler head,
The thermal decomposition part is provided so as to be movable in the vertical direction, and a pressure body provided with a pressing part that comes in contact with the pressure receiving part provided on the holding member side that holds the assembled state of the thermal decomposition part. ,
A spring member that has a resilient force in the vertical direction and applies a load to the closing position to the valve body from below, and applies a load to the holding position to the holding member from above, and downward to the pressing body A spring member that presses the pressure receiving portion on the holding member side from above by the pressing portion, and applies a load to the holding position from above via the pressing body,
The pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed such that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface have a surface from the center side to the outer peripheral side. It is formed as having a height changing surface that changes the height, and when the thermal decomposition part is decomposed in the event of a fire, as the pressure receiving part of the holding member inclines with the mutual contact as a fulcrum, the contact is A sprinkler head, characterized in that the sprinkler head is formed so as to move along the height change surface from the center side to the outer peripheral side.   The sprinkler head according to claim 5, wherein the change surface is formed as a curved surface and / or an inclined surface in both the pressure receiving portion on the holding member side and the pressing portion of the pressing body.   Both the pressure receiving part on the holding member side and the pressing part of the pressing body are formed as a curved surface as a whole, including the change surface, and the radius of curvature is larger on the concave side than on the convex side. The sprinkler head according to claim 5.   The sprinkler head according to any one of claims 5 to 7, wherein the pressure receiving portion on the holding member side is a concave surface, and the pressing portion of the pressing body is a convex surface.

Images