JP6945401B2 - Sprinkler head - Google Patents

Description

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

In the event of a fire, the sprinkler head for fire extinguishing detects the heat generated by the fire and automatically opens and sprays water from the nozzle to extinguish the fire.

This sprinkler head supports the valve body that always closes the nozzle and holds it in the closed position, while in the event of a fire, it senses the heat and disassembles it, releases the valve body and moves it to the open position. It has a support mechanism (hereinafter, this mechanism is referred to as a "heat-sensitive decomposition unit"). A low melting point alloy is used to detect the heat of a fire, and the heat-sensitive decomposition part decomposes by melting the low melting point alloy.

In the thermal decomposition section, when the low melting point alloy starts melting in the event of a fire, the thermal decomposition section starts displacement toward decomposition. At that time, if the valve body is separated from the closed position before decomposition, water leaks from the nozzle, and the water cools the low melting point alloy, which delays or stops melting. become.

The heat-sensitive decomposition section is provided with a spring member that applies a strong load in the closing direction to the valve body. Even if the heat-sensitive decomposition part starts to be displaced, if the displacement is within the deflection (displacement) of the spring member, the residual load in the closing direction can be applied to the valve body, and the valve body is held in the closing position. be able to. That is, if a spring member having a deflection that absorbs displacement during decomposition in the heat-sensitive decomposition portion 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 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 heat-sensitive decomposition unit decomposes while tilting due to a change in the portion where the solder starts to melt depending on a dimensional error of a part, an assembly error, or a position of a fire source. Even when disassembling while tilting in this way, it is preferable that the disc spring can uniformly apply a load in the closing direction to the valve body. For example, as proposed earlier by the Patent Applicant, if the load of the disc spring is applied through the spherical head of the pressing member, even if the heat-sensitive decomposition part is disassembled while tilting, A load in the closing direction of the disc spring can be uniformly applied to the valve body (see Patent Document 2).

Japanese Unexamined Patent Publication No. 2012-105952 Japanese Unexamined Patent Publication No. 2014-144153

In the heat-sensitive decomposition section, as described above, a disc spring is used as a spring member that applies 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 decomposition in the heat-sensitive decomposition section. By using the disc spring, a strong load can be applied to the valve body in the closing direction, and the mounting space can be reduced.

However, not limited to disc springs, spring members used in heat-sensitive decomposition parts have an elastic force that gives a strong load (for example, 80 kgf), but the degree of increase in deflection is 1 mm. Its design is very difficult, even if:

In view of the above circumstances, it is an object of the present invention to provide a sprinkler head capable of reducing the deflection required for a spring member used in a heat-sensitive decomposition unit.

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 decomposed, and the valve body is released and moved to the open position. In the sprinkler head having 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, and the pressing portion presses the pressure receiving portion of the valve body from below. The valve body is provided with a spring member that applies a load to the closing position from below via the pressing body, and the pressure receiving portion of the valve body and the pressing portion of the pressing body have a convex surface on one side and a concave surface on the other side. Both the convex surface and the concave surface are formed as having a height-changing surface that changes the height of the surface from the central side to the outer peripheral side, and further, the heat-sensitive decomposition portion is decomposed in the event of a fire. At that time, as the pressing portion of the pressing body tilts with the mutual contact as a fulcrum, the contact is formed so as to move from the center side to the outer peripheral side along the mutual height change surface. It is a sprinkler head.

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 direction of the sprinkler head changes, it will change according to the positional relationship. For example, if the sprinkler head is facing up, "up" will change to "down" and "bottom" will change to "up".

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

Further, in the present invention, both the pressure receiving portion of the valve body and the pressing portion of the pressing body are formed as a curved surface as a whole including the changing surface, and the radius of curvature thereof is on the concave surface side rather than the convex surface side. It is a sprinkler head characterized by being larger.

Further, the present 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.

Further, the present invention, while retaining at all times the closed position by supporting the valve member to close the Roh nozzle, during fire decomposes senses the heat is moved to the open position by releasing the valve body In a sprinkler head having a heat-sensitive decomposition portion, the heat-sensitive decomposition portion is provided so as to be movable in the vertical direction, and is provided from above on a pressure receiving portion provided on the side of a holding member that holds the heat-sensitive decomposition portion in an assembled state. A spring that has a pressing body provided with a pressing portion that comes into contact with the valve body and has elastic force in the vertical direction, and applies a load to the closing position to the valve body from below and a load to the holding position to the holding member from above. A member, which 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 to the holding member via the pressing body. The pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed as having a convex surface on one side and a concave surface on the other side, and both the convex surface and the concave surface are formed. , It 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 further, when the heat-sensitive decomposition part is disassembled in the event of a fire, the pressure receiving on the holding member side with the mutual contact as a fulcrum. The sprinkler head is characterized in that the contact points are formed so as to move along the height changing surfaces of each other from the central side to the outer peripheral side as the portion is tilted.

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

Further, in the present invention, both the pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed as a curved surface as a whole including the changing surface, and the radius of curvature thereof is closer to the concave surface side than the convex surface side. It is a sprinkler head characterized by having a large radius.

Further, the present invention is a sprinkler head characterized in that 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 so that one is convex and the other is concave, and both the convex and concave surfaces are from the center side to the outer peripheral side. It is formed as having a height-changing surface that changes the height of the surface, and further, when the heat-sensitive decomposition part is disassembled in the event of a fire, the contact is centered as the pressing bodies are tilted with the mutual contact as a fulcrum. Since it is formed so as to move from the side to the outer peripheral side along each other's height change surface, when the heat-sensitive decomposition part tilts in the event of a fire, the pressure receiving part of the valve body serves as a fulcrum of the tilt. The contact points of the pressing body with the pressing portion move from the center side to the outer peripheral side along the height changing surfaces of each other. Thereby, the pressing body can be moved downward with respect to the valve body, and can be moved in the direction of reducing the deflection of the spring member.

Further, in the present invention, the pressure receiving portion on the holding member side and the pressing portion of the pressing body are formed so 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. It is formed as having a height-changing surface that changes the height of the surface on the outer peripheral side, and further, when the heat-sensitive decomposition part is disassembled in the event of a fire, the contact is inclined with the mutual contact as a fulcrum, and the contact is on the center side. Since it is formed so as to move along the height changing surfaces of each other from the outer peripheral side to the outer peripheral side, the holding member side which becomes a fulcrum of the inclination when the heat-sensitive decomposition part is inclined in the event of a fire, as described above. The contact point between the pressure receiving portion and the pressing portion of the pressing body moves from the center side to the outer peripheral side along each other's height changing surface. As a result, the pressing body can be moved upward with respect to the holding member side, and can be moved in a direction in which the deflection of the spring member is reduced.

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 convex and concave surfaces, and thus are used in the heat sensitive decomposition portion. It is possible to provide a sprinkler head capable of reducing the deflection required for the spring member.

A first embodiment of the sprinkler head of the present invention is shown, in which (a) is a vertical sectional view of the whole and (b) is a partially enlarged view in a normal state. The same embodiment is shown. In the event of a fire, (a) is a vertical cross-sectional view of the entire thermal decomposition section, and (b) is a partially enlarged view. It is explanatory drawing which showed how the contact moves on the concave surface which is the pressing part of the set pin (an example of a support) in the said embodiment. The same embodiment is shown, and it is a vertical cross-sectional view in a state where the thermal decomposition part is disassembled and dropped, the valve body is released and moved to the open position, and water is discharged from the nozzle. A second embodiment is shown, in which FIG. 1A is a diagram corresponding to FIG. 1A, and FIG. 1B is a diagram corresponding to FIG. 1B. A third embodiment is shown, in which FIG. 1A is a diagram corresponding to FIG. 1A, and FIG. 1B is a diagram corresponding to FIG. 1B. The same embodiment is shown, in which FIG. 2A is a diagram corresponding to FIG. 2A, and FIG. 2B is a diagram corresponding to FIG. 2B. Further four other examples of the pressure receiving portion of the valve body and the pressing portion of the set pin are shown, and all of (a) to (d) are enlarged vertical cross-sectional views of only the valve body and the set pin.

An embodiment of the sprinkler head of the present invention will be described with reference to FIGS. 1 to 8 as an example of using a disc spring as a spring member. In the present invention, a spring member other than a disc spring can be used, and for example, a leaf spring can be used.

[First Embodiment]
First, the sprinkler head 1-1 of the first embodiment will be described with reference to FIGS. 1 to 4.

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

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

[Valve body]
The valve body 4 is provided so as to be movable in the vertical direction, and is always supported by the heat-sensitive decomposition unit 5, is located above the closed position, and is provided on the peripheral edge of the water discharge port 2a of the nozzle 2. While maintaining the seated state on the valve seat 2b (see FIG. 1), in the event of a fire, the heat-sensitive decomposition unit 5 disassembles, and when the support provided by it is released, it moves downward, which is the open position. , The water discharge port 2a of the nozzle 2 is opened so that the fire extinguishing water W can be discharged from the nozzle 2 (see FIG. 4). Although the details will be described later, the lower surface of the valve body 4 is provided with a pressure receiving portion 4a that comes into contact with the heat sensitive decomposition portion 5.

[Thermal decomposition part]
In the case of the present embodiment, the heat-sensitive decomposition unit 5 includes a plurality of balls 10 (an example of the holding member) arranged in an annular shape as a member for holding the assembled state. By holding the plurality of balls 10 at a predetermined position at all times, the assembled state is maintained and the state of holding the valve body 4 at the closed position is maintained, while in the event of a fire, the lower part of the heat-sensitive decomposition unit 5 is maintained. The low melting point alloy 11 provided in the above is decomposed by melting.

Specifically, the heat-sensitive decomposition section 5 is a heat collecting section 12 having a recess 12a in the center, and a filling section that is inserted from below into the central opening of the recess 12a and is filled with the low melting point alloy 11 together with the recess 12a. A plunger 13 having a flange portion 13a forming an annular shape is provided at the lower portion. Further, above the heat collecting portion 12, a slider 14 for supporting the ball 10 from above between the flange 6a provided on the frame 6 of the head body 3 and a balancer 15 for supporting the ball 10 from below are provided. Further, it has an elastic force in the vertical direction and is inserted into the disc spring 16 placed on the slider 14 and the central opening of the disc spring 16 from above, and the elastic force upward of the disc spring 16. It has a flange 17b that receives the receiver, and is provided with a set pin 17 (an example of a pressing body) that can move in the vertical direction. The plunger 13 is inserted through the central opening of the recess 12a of the heat collecting portion 12 from below, and then inserted into the central opening of the balancer 15, and the upper portion thereof reaches the central opening of the slider 14, where the slider 14 and the plunger 13 are inserted. It is screwed. Further, the set pin 17 is inserted into the central opening of the disc spring 16 from above and then inserted into the inside through the upper opening of the plunger 13 so as to be movable in the vertical direction.

In the heat-sensitive decomposition unit 5, the set pin 17 has a flange 17b on a head 17a protruding upward from the central opening of the disc spring 16 and receiving an upward elastic force of the disc spring 16, and the head thereof. The upper surface of the 17a has a pressing portion 17c that comes into contact with the pressure receiving portion 4a provided on the lower surface of the valve body 4. If the normally assembled state is maintained, the pressing portion 17c of the set pin 17 presses the pressure receiving portion 4a of the valve body 4 by the upward elastic force of the disc spring 16, and the valve body 4 is loaded in the closing direction. Is transmitted, and the valve body 4 is held in the closed position. In the present embodiment, the pressing portion 17c is described as forming a substantially arc in cross-sectional view, but the shape is not limited to that as will be described later.

Here, the slider 14 has a support portion 14a on the lower surface that comes into contact with the ball 10 from above. The balancer 15 has a stepped portion 15a that comes into contact with the flange portion 6a of the frame 6 from below when the low melting point alloy 11 is not melted at all times. The ball 10 is held at three points: a flange portion 6a of the frame 6, a step portion 15a of the balancer 15, and a support portion 14a of the slider 14. As a result, the heat-sensitive decomposition unit 5 is maintained in a constantly assembled state (see FIG. 1). On the other hand, when the low melting point alloy 11 melts 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 space between the balancer 15 and the slider 14 opens. As a result, the ball 10 moves inward as the balancer 15 descends, and 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 heat-sensitive decomposition unit 5 gradually releases the state of holding the assembled state (see FIG. 2). Then, when the ball 10 enters the inside of the flange portion 6a of the frame 6, it gets over the flange portion 6a and falls downward, and at the same time, the thermal decomposition portion 5 decomposes and falls downward. As a result, the state in which the valve body 4 is held in the closed position by the heat-sensitive decomposition unit 5 is released, and as described above, the valve body 4 moves downward, which is the open position, to open the water discharge port 2a of the nozzle 2, and the nozzle The fire extinguishing water W can be discharged from No. 2 (see FIG. 4).

Then, in the sprinkler head 1-1, as detailed in the enlarged views of FIGS. 1 (b) and 2 (b), 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 surface 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 pins 17 are tilted with the mutual contact points P as fulcrums, the contact points P are formed so as to move from the center side to the outer peripheral side along the mutual height changing surfaces 14b and 17d.

When the heat-sensitive decomposition unit 5 disassembles while tilting in the event of a fire, as shown in FIGS. As a fulcrum, the portion below the set pin 17 is tilted. At that time, since the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 are formed as the convex surface and the concave surface as described above, the contact P is formed as the pressing portion 17c of the set pin 17 is tilted. , It will move from the center side to the outer peripheral side along the height changing surfaces 4b and 17d, and will move 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, from the position P1 on the concave surface on the concave surface as shown in detail in the explanatory view of FIG. By moving to the position P2 on the outer peripheral side, the vertical dimension moves to the larger side by X minutes.

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

Therefore, 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 the concave surface and the convex surface as described above, so that the dish used in the heat sensitive decomposition unit 5 The deflection h required for the spring 16 can be reduced. That is, the design of the disc spring 16 can be facilitated.

Since the contact P also moves along the height changing surface of the pressure receiving portion 4a, which is the convex surface of the valve body 4, the set pin 17 moves downward by exactly the same height difference X as shown in FIG. Do not mean. However, by making the X larger, the deflection h of the disc spring 16 can be moved more in the direction of making it smaller.

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, both 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 as a whole including the height changing surfaces 4b and 17d. At all times, the top portion 4c on the convex surface side and the bottom portion 17e on the concave surface side, which are the central portions of each other, are in contact with each other, and the contact point 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 radius of curvature than the pressure receiving portion 4a of the valve body 4 formed as a convex surface. These surface shapes can be appropriately changed as described in detail later.

[Second Embodiment]
Next, the sprinkler head 1-2 of the second embodiment will be described with reference to FIG.

The sprinkler head 1-2 of the present embodiment is obtained by reversing the convex surface and the concave surface of the pressure receiving portion 4a of the valve body 4 and the pressing portion 17c of the set pin 17 as those in the first embodiment. That is, as shown in FIGS. 5A and 5B, it is assumed that 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 a thing. 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 acting on the valve body 4 when the heat-sensitive decomposition unit 5 is tilted, in the first embodiment, the pressure receiving portion 4a of the valve body 4 formed as a convex surface is used. Since the pressing portion 17d of the set pin 17 formed as a concave surface presses the valve body 4 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 the present 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 have a circular cross section as a whole including the height changing surfaces 4b and 17d. It is formed as an arc-shaped curved surface, and at all times, the top portion 17f on the convex surface side and the bottom portion 4d on the concave surface side, which are the central portions of each other, are in contact with each other, and the contact point P is formed there. Further, the pressure receiving portion 4a of the valve body 4 formed as a concave surface is formed as a curved surface having a larger radius of curvature than the pressing portion 17c of the set pin 17 formed as a convex surface.

[Third Embodiment]
Next, the sprinkler heads 1-3 of the third embodiment will be described with reference to FIGS. 6 and 7.

The sprinkler head 1-3 of the present embodiment has a set pin 17 instead of providing a fulcrum portion between the valve body 4 and the set pin 17 as a fulcrum when the thermal decomposition unit 5 is tilted as in the above embodiment. It is provided between the plunger 13 and the plunger 13. Hereinafter, parts different from the above-described embodiment will be described, but for convenience of explanation, the same drawing codes as those in the above-described embodiment will be used except for additional parts.

In the sprinkler heads 1-3, as shown in FIGS. 6A and 6B, the disc spring 16 is inserted 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. Further, the plunger 13 has a pressing portion provided on the upper surface of the upper end portion 13b protruding upward while the upper portion of the plunger 13 is screwed with the central opening of the slider 14, and is provided on the lower surface of the head 17a of the set pin 17. A pressure receiving portion 13c (an example of the pressure receiving portion on the holding member side) with which the 17c contacts from above is provided.

That is, in the sprinkler head 1-3, the heat-sensitive decomposition unit 5 assumes that the disc spring 16 is located between the pressure receiving portion 4a of the valve body 4 and the flange 17b of the set pin 17, and is moved upward by the disc spring 16. A load is applied to the valve body 4 from below via the washer 18 to the closing position, and a load is applied to the lower ball 10 from above via the set pin 17, the flanger 13 and the slider 14. There is. Further, as shown in FIGS. 7A and 7B, when the heat-sensitive decomposition unit 5 is tilted, the contact point P between the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 is used as a fulcrum, and the plunger 13 or less. The part of is supposed to be tilted.

Then, the heat-sensitive decomposition unit 5 has the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 having a convex surface on one side and a concave surface on the other side, as in the above embodiment, and the convex and concave surfaces. It is assumed that each has height changing surfaces 17d and 13d that change the height of the surface from the center side to the outer peripheral side.

Also in the sprinkler heads 1-3, the deflection h required for the disc spring 16 used in the heat-sensitive decomposition unit 5 can be reduced as in the above-described embodiment.

That is, in the case of the present embodiment, as described above, the components below the plunger 13 are tilted 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, since the pressing portion 17c of the set pin 17 and the pressure receiving portion 13c of the plunger 13 are formed as the convex and concave surfaces as described above, the pressure receiving portion 13c of the plunger 13 is tilted and is a fulcrum thereof. The contact point P moves from the position on the central side to the position on the outer peripheral side along the height changing surfaces 17d and 13d. Then, in the present embodiment in which the pressure receiving portion 13c side of the plunger 13 is a concave surface, the contact P moves on the concave surface from the position on the central side to the position on the outer peripheral side, and moves to the side having a larger dimension in the vertical direction. do. As a result, when the set pin 17 is tilted with the contact point P as the fulcrum, it moves upward with respect to the plunger 13 and moves in the direction of reducing the deflection h of the disc spring 16, which is necessary for the disc spring 16. The deflection h can be reduced.

Also in this 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 have an arcuate cross section as a whole including the height changing surfaces 13d and 17d. At all times, the top portion 17f on the convex surface side and the bottom portion 13e on the concave surface side, which are the central portions of each other, are in contact with each other, and the contact point P is formed there. Further, the pressure receiving portion 13c of the plunger 13 formed as a concave surface is formed as a curved surface having a larger radius of curvature than the pressing portion 17c of the set pin 17 formed as a convex surface.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, regarding the surface shapes of the convex and concave surfaces 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 changing surfaces 4b and 17d are inclined instead of the curved surface. It can have a surface. Further, the top portion 4c or the bottom portion 17e of the central portion may have a flat surface or a curved surface. Specifically, if the pressing portion 17c of the set pin 17 on the concave surface side in the first embodiment is shown as an example, as shown in FIG. 8A, the height changing surface 17d has an inclined surface and has an inclined surface. It can have a flat surface as the bottom 17e. That is, it can be continuous as an inclined surface, a flat surface, and an inclined surface from one side to the other side in the radial direction. Further, as shown in FIG. 8B, the height changing surface 17d may have an inclined surface extending to the central portion. That is, it can be continuous as an inclined surface / inclined surface from one side to the other side in the radial direction. Further, as shown in FIG. 8C, it is possible to have a slope as the height changing surface 17d and a curved surface as the bottom 17e. That is, it can be continuous as an inclined surface, a curved surface, and an inclined surface from one side to the other side in the radial direction. Further, as shown in FIG. 8D, it is possible to have a curved surface as the height changing surface 17d and a flat surface as the bottom portion 17e. That is, it can be continuous as a curved surface, a flat surface, or a curved surface from one side to the other side in the radial direction.

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

Further, the modification of the convex / concave surface in the first embodiment can be applied to the convex / 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: Screwed part 4: Valve body 4a: Pressure receiving part 4b: High Change surface 4c: Top 4d: Bottom 5: Heat-sensitive decomposition part 6: Frame 6a: Flange 10: Ball
11: Low melting point alloy 12: Heat collecting part 12a: Recessed part 13: Plunger
13a: Flange 13b: Upper end 13c: Pressure receiving part 13d: Height change surface 13e: Bottom 14: Slider 14a: Pressing part 15: Balancer
15a: Step 16: Belleville spring 17: Set pin 17a: Head
17b: Flange 17c: Pressing part 17d: Height change surface 17e: Bottom 17f: Top 18: Washer P: Contact h: Deflection W: Fire extinguishing water

Claims (2)

A sprinkler head having a heat-sensitive decomposition part that supports the valve body that normally closes the nozzle and holds it in the closed position, while detecting the heat and disassembling it in the event of a fire and releasing the valve body to move it to the open position. In
The heat-sensitive decomposition portion is provided so as to be movable in the vertical direction, and a pressing portion provided with a pressing portion that comes into contact with the pressure receiving portion of the valve body from below, and a pressing body.
A spring member that has elastic 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 the pressing portion receives the pressure of the valve body. A spring member that presses the portion from below and applies a load to the closing position to the valve body from below via the pressing body is provided.
The pressure receiving portion of the valve body and the pressing portion of the pressing body are formed so that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface are raised from the center side to the outer peripheral side. It is formed as having a height changing surface that changes the height, and further, when the heat-sensitive decomposition part is disassembled in the event of a fire, the contact point is the center as the pressing part of the pressing body tilts with the mutual contact as a fulcrum. A sprinkler head characterized in that it is formed so as to move from the side to the outer peripheral side along each other's height changing surface. Normally while retaining the closed position by supporting the valve member to close the Roh nozzle, during fire decomposes to sense the heat, and a heat-sensitive decomposition unit that moves to the open position by releasing the valve body In the sprinkler head
The heat-sensitive decomposition portion is provided so as to be movable in the vertical direction, and is provided with a pressing portion that comes into contact with a pressure receiving portion that is located on the holding member side that holds the assembled state of the heat-sensitive decomposition portion. ,
A spring member that has an elastic force in the vertical direction, 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 is a spring member that applies a load to the holding position downward to the pressing body. A spring member is provided, which applies a load of the above, presses the pressure receiving portion on the holding member side from above by the pressing portion, and applies a load to the holding position to the holding member 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 so that one is a convex surface and the other is a concave surface, and both the convex surface and the concave surface are surfaces from the center side to the outer peripheral side. It is formed as having a height changing surface that changes the height, and further, when the heat-sensitive decomposition part is disassembled in the event of a fire, the contact point becomes tilted as the pressure receiving part of the holding member tilts with the mutual contact as a fulcrum. A sprinkler head characterized in that it is formed so as to move from the central side to the outer peripheral side along each other's height changing plane.

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