JP4859878B2 - Sprinkler head - Google Patents

Description

  The present invention relates to a sprinkler head.

  In conventional sprinkler heads, the valve body is maintained in a water-stopped state by catching the ball that has been pushed to the outer periphery by the slider and balancer on the annular projecting edge at the lower end of the frame. The heat-sensitive part is thermally responsive to loosen the contact between the slider and the balancer, and coupled with this, the slider is pressed downward by the elasticity of the spring, releasing the hooked state between the ball and the annular projecting edge at the lower end of the frame. The thing which starts a fire extinguishing operation is proposed (for example, refer to patent documents 1).

JP-A-10-179789

  In a conventional sprinkler head, a heat sensitive element such as solder is melted by heat, and in response to this, the lock ball receiving portion moves to release the lock ball. Since the abutment surface of the lock ball receiving portion with which the lock ball abuts has a constant inclination angle, the movement amount of the lock ball receiving portion and the ball movement amount are in a proportional relationship. For this reason, for example, when the thermal element is displaced over time (hereinafter also referred to as “creep”), there is a problem that the lock ball moves in proportion to the creep amount and malfunctions.

  On the other hand, in order to prevent malfunction, it is conceivable that the inclination angle of the contact surface of the lock ball receiving portion is steep (including vertical), but in this case, the thermal element is dissolved by heat from the fire. However, the amount of movement of the lock ball is reduced, and in order to secure the amount of movement of the lock ball, it is necessary to increase the amount of movement of the piston, and there is a problem that it cannot be operated quickly in the event of a fire. is there. Further, when the inclination angle is small, the downward force received by the piston is increased, and creep is promoted.

  The present invention has been made in order to solve the above-described problems. A sprinkler head that can prevent malfunction due to secular displacement of a thermal element and can be quickly activated when a fire occurs is provided. The purpose is to obtain.

A sprinkler head according to the present invention includes a head body having a water discharge port, a valve body that closes the water discharge port, and a thermal decomposition mechanism that supports the valve body, and the thermal decomposition mechanism is detached from the head body. a lock ball to prevent, a piston lock ball receiving part is formed to support the locking ball, provided under the piston, the sprinkler head comprising a thermal element that melts by heat, the locking ball receiving unit Is provided with an inclined surface with which the lock ball abuts, and the inclined surface of the lock ball receiving portion is composed of at least two or more inclined surfaces having different inclination angles.

  Further, in the lock ball receiving portion of the piston, the inclination angle of the first inclined surface is larger than the inclination angle of the second and subsequent inclined surfaces.

The sprinkler head according to the present invention includes a head body having a water outlet, a valve body that closes the water outlet, and a thermal decomposition mechanism that supports the valve body, and the thermal decomposition mechanism is separated from the head body. In a sprinkler head comprising: a lock ball that prevents the release of the lock ball; a piston having a lock ball receiving portion that supports the lock ball; and a thermal element that is provided below the piston and melts by heat. The surface is provided with a curved taper that becomes steeper as the contact surface with the lock ball moves toward the outer periphery.

  In the present invention, at least two or more inclined surfaces with different inclination angles are provided on the lock ball receiving portion, so that malfunction due to secular displacement of the thermal element can be prevented, and promptly when a fire occurs. Can be operated.

Embodiment 1. FIG.
1 is a longitudinal sectional view according to the first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the head main body of FIG. 1, FIG. 3 is a longitudinal sectional view of the frame of FIG. FIG. 5 shows the deflector assembly of FIG. 1, FIG. 6 shows the thermal decomposition mechanism of FIG. 1, FIG. 7 shows the piston of FIG. 1, (a) is a plan view, (b) 8 is a sectional view, FIG. 8 shows the heat sensitive plate of FIG. 1, (a) is a plan view, (b) is a sectional view, and FIG. 9 is an external view of FIG.

  In the figure, reference numeral 1 denotes a head body having a central portion penetrating therein and having a water discharge port 2 therein. The upper surface of the flange 4 is provided with a threaded portion 3 connected to the water supply pipe, and the lower surface of the flange 4 is provided with a cylindrical portion 6 provided with a threaded portion 5 into which a frame 10 described later is screwed. Yes. The cylindrical portion 6 is formed with a hole 7 in the circumferential direction in which a post 23 described later is loosely fitted. Further, a groove portion 8 is formed on the inner peripheral surface side of the cylindrical portion 6. The groove portion 8 is formed with a tapered surface with which a lock ball 71 described later contacts. The frame 10 only needs to be connected to the head body 1. For example, both may be integrated, and in this case, the frame 10 is a frame portion.

  Reference numeral 10 denotes a cylindrical frame coupled to the head main body 1, which is longer than the cylindrical portion 6, and a female screw portion 11 that is screwed into the screw portion 5 of the head main body 1 is provided at the upper portion. At the lower end, a flange-shaped step 12 is formed in an annular shape inside.

  A valve body 15 closes the water outlet 2 of the head body 1. The valve body 15 has an outer diameter main body 51 slightly smaller than the inner diameter of the cylindrical portion 6 of the head main body 1, and a head 52 that protrudes from the central upper surface of the main body 51 and is inserted into the water outlet 2 of the head main body 1. In addition, the main body 51 includes a stepped portion 54 that protrudes upward from the outer peripheral portion of the upper surface 53 that is the water outlet side.

  Between the valve body 15 and the water outlet 2, for example, a fluororesin is coated, and a circular disc spring 17 having a substantially C-shaped cross section is interposed. The disc spring 17 is formed in a donut shape, and a connecting hole is provided in the center. The inner diameter of the connection hole is substantially the same as the outer diameter of the head 52 of the valve body 15, and the disc spring 17 is attached to the head 52 of the valve body 15 through the connection hole. The disc spring 17 is in contact with the water discharge port edge 9 on the outer periphery of the lower end of the water discharge port 2. Further, the upper surface of the stepped portion 54 of the valve body 15 is in contact with the water discharge port edge 9 of the head body 1 outside the disc spring 17 so that the disc spring 17 has a predetermined displacement. A gap is formed between 53 and the lower surface of the water discharge port edge 9 of the head body 1. As a result, a predetermined restoring force acting upward is generated on the outer peripheral side of the disc spring 17, the outer peripheral edge of the disc spring 17 is in pressure contact with the water discharge port edge 9, and acts downward on the inner peripheral side. A predetermined restoring force is generated, and the inner peripheral edge of the disc spring 17 is brought into pressure contact with the upper surface 53 of the valve body 15 to keep the water outlet 2 and the valve body 15 watertight. In order to improve the corrosion resistance, a fluororesin coating is applied, but this may be omitted.

  A deflector assembly 20 includes a deflector 21, a support 23, a stopper ring 25, and a valve body 15. The support column 23 is formed with a flange-like locking portion at the upper end and the lower end thereof, and is inserted into the hole 7 of the head body 1. The stopper ring 25 has a through hole in which the support 23 is loosely fitted in the circumferential direction, and its inner diameter is slightly larger than the outer diameter of the main body 51 of the valve body 15, and the outer diameter is larger than the inner diameter of the frame 10. It is small and is sized to be locked to the stepped portion 12 of the frame 10 when the water is lowered during water discharge. The disc-shaped deflector 21 has through holes into which the support columns 23 are fitted in the circumferential direction, and the outer diameter thereof is smaller than the inner diameter of the step portion 12 of the frame 10, and the inner diameter is the main body portion 51 of the valve body 15. The valve body 15 is locked when the water is lowered when the water is discharged.

  Reference numeral 30 denotes a thermal decomposition mechanism that supports the valve body 15 and includes a ball support cylinder 31, a thermal part 40, and a guard member 35. The cylindrical ball support cylinder 31 is slidably disposed in the frame 10 and, for example, six insertion holes 32 of a lock ball 71 described later are formed in the upper side surface thereof. In addition, the inner diameter of the lower part is reduced, and a screw part to which a cylinder 41 described later is screwed is formed on the inner peripheral surface, and a screw part to which a guard member 35 described later is screwed on the lower outer peripheral surface. Is formed. The inner diameter of the insertion hole 32 is formed larger than the outer diameter of the lock ball 71. Further, the upper outer diameter of the ball support cylinder 31 is formed in substantially the same shape as the main body 51 of the valve body 15, and an annular step is formed on the lower surface of the main body 51, so that the valve body is formed above the ball support cylinder 31. 15 is locked.

  The heat sensitive unit 40 includes a cylinder 41, a heat sensitive plate 42, a fusible alloy 62, and a piston 63. The cylinder 41 is formed in a bottomed cylindrical shape, and is screwed into the ball support cylinder 31 by a screw portion provided at the upper part of the outer periphery, and the lower part protrudes from the lower end of the ball support cylinder 31. Further, after inserting a connection hole of the heat sensitive plate 42 on the lower surface, the heat sensitive plate 42 is integrated and fixed by caulking.

  The fusible alloy 62 is a heat-sensitive element made of, for example, compression solder, and is accommodated under the piston 63 in the cylinder 41 and melted by heat. The fusible alloy 62 protrudes downward from the lower surface of the ball support cylinder 31 and is provided at a position where it can easily hit a hot air stream. The fusible alloy 62 serving as the heat sensitive element may not be an alloy, and may be a fusible piece made of resin, for example.

  The piston 63 is formed in a T-shaped cross section and is accommodated in the cylinder 41 so as to be slidable up and down on the fusible alloy 62. Further, a disk-shaped lock ball receiving portion 64 is provided on the upper portion of the piston 63, and the outer diameter thereof is formed slightly smaller than the inner diameter of the upper portion of the ball support cylinder 31. Further, on the outer periphery of the lock ball receiving portion 64, an inclined surface (tapered surface) on which the lock ball 71 abuts is formed by two inclined surfaces having different inclination angles. Here, the piston 63 is a general term for members that press the fusible alloy.

  The inclined surface of the lock ball receiving portion 64 includes a first inclined surface 65 and a second inclined surface 66, and the first inclined surface 65 serving as the first inclined surface has an inclination angle of the second step. It is larger than the inclination angle of the second inclined surface 66 to be a surface and is formed with a steep slope (including vertical). Here, the inclination angle refers to an angle with respect to the horizontal bottom surface of the lock ball receiving portion 64.

  The lock ball 71 is made of a steel material or the like, enters the insertion hole 32 of the ball support cylinder 31, and comes into contact with the groove portion 8 of the head body 1 and the inclined surface of the lock ball receiving portion 64. Further, it is prevented from leaving the frame 10.

  The heat sensitive plate 42 is a disc whose central portion is bent into a truncated cone shape, and a connecting hole 43 is provided in the central portion. The upper portion 44 is fixed by caulking to the bottom surface of the cylinder 41, and the inclined surface 45 is formed. It is bent so as to incline toward the fusible alloy 62 accommodated in the cylinder 41. The lower part 46 of the heat sensitive plate 42 is formed substantially horizontally and extends to the lower side of the guard member 35. Further, a predetermined gap (thermal airflow space) is provided between the lower portion 46 of the heat sensitive plate 42 and the lower end of the guard member 35. In the present embodiment, the case where the number of the heat sensitive plates 42 is one will be described. However, the present invention is not limited to this, and a plurality of heat sensitive plates 42 may be provided.

  The guard member 35 is a substantially cylindrical body, the outer diameter of the upper portion thereof is reduced, the outer diameter is formed smaller than the inner diameter of the step portion 12 of the frame 10, the inner diameter of the upper portion thereof is reduced, and the ball support cylinder 31. A screw part to be screwed is formed. Further, a stepped portion whose diameter is expanded on the lower side is provided on the outer peripheral side of the guard member 35, and a contact portion 37 that contacts the lower surface of the stepped portion 12 of the frame 10 in the vertical direction is formed. The lower side of the contact portion 37 is formed in a tapered shape that tapers downward. The height of the guard member 35 is selected such that the lower end of the guard member 35 is below the fusible alloy 62 and above the lower portion 46 of the heat sensitive plate 42 when screwed with the ball support cylinder 31. It is. Further, the guard member 35 is provided between the ball support cylinder 31 of the thermal decomposition mechanism 30 and the frame 10 coupled to the head main body 1 so as to close the gap between the two, that is, has a width for closing the gap between the both. And the inside of the frame 10 is sealed.

  In the sprinkler head as described above, the valve body 15 seals the water discharge port 2 of the head main body 1 with an assembly load to prevent water leakage, and this assembly load is transmitted to the lock ball 71 via the ball support cylinder 31. Acts downward. The lock ball 71 is pressed against the tapered surface of the groove 8 of the head body 1 by this load. For this reason, the lock ball 71 is always subjected to a force to enter the inside of the ball support cylinder 31. However, since the lock ball 71 is prevented from moving by the contact surface of the lock ball receiving portion 64 of the piston 63, the lock ball 71 is held at that position and locks the ball support cylinder 31.

Next, the operation of this embodiment will be described.
FIG. 10 shows a case where the sprinkler head is in a warning state. Pressurized fire-extinguishing water is supplied to the water outlet 2 of the head body 1, and the pressure of the fire-extinguishing water is applied to the valve body 15. Yes.

  Now, when a fire occurs, the hot airflow flows along the lower surface of the ceiling plate (not shown) from the side or from below to heat up against the heat sensitive plate 42, and the heat is transmitted to the cylinder 41. The fusible alloy 62 accommodated in the cylinder 41 begins to be heated and melted from the surroundings, and the melted fusible alloy 62 flows out between the cylinder 41 and the piston 63 to reduce its volume.

  At this time, as indicated by the arrows in FIG. 10, the hot airflow from the lateral direction heats the heat sensitive plate 42, and in the gap (thermal airflow space) between the lower portion 46 of the heat sensitive plate 42 and the lower end of the guard member 35. It flows in, rises along the inclination of the inclined surface 45 and directly hits the cylinder 41 to heat the cylinder 41. Further, the hot airflow from below also rises along the lower surface side of the inclined surface 45 and heats the lower surface side of the cylinder 41. For this reason, the fusible alloy 62 is provided above the lower end portion of the guard member 35, and the heat receiving efficiency is improved even if the fusible alloy 62 is not provided outside the sprinkler head. Melt with.

  When the soluble alloy 62 melts and its volume decreases, the lock ball receiving portion 64 of the piston 63 descends as shown in FIG. As a result, the lock ball 71 is released from the groove 8 of the head main body 1 and enters the inside of the ball support tube 31 to unlock the ball support tube 31.

  Then, as shown in FIG. 12, the thermal decomposition mechanism 30 is lowered by its own weight and the water pressure of the fire extinguishing water, and is detached from the frame 10 and dropped. At the same time, the deflector assembly 20 including the valve body 15 also falls due to its own weight and the water pressure of the fire extinguishing water, and the stopper ring 25 is seated on the step portion 12 of the frame 10 and stopped. At this time, the valve body 15 is guided by the ball support cylinder 31 and descends and is seated on the deflector 21. As a result, the water outlet 2 of the head body 1 is opened, and the fire extinguishing water is sprayed from the deflector 21 to extinguish the fire.

Here, the relationship between the piston movement amount and the rock ball movement amount will be described.
FIG. 13 is a diagram for explaining the relationship between the piston movement amount and the lock ball movement amount when the lock ball receiving portion 64 has a one-step taper. First, as shown in FIG. 13A, consider a case where the lock ball receiving portion 64 has a one-step taper. As described above, when the volume of the fusible alloy 62 decreases, the piston 63 moves downward in response to the displacement. At this time, the lock ball 71 is moved inward while being in sliding contact with the inclined surface of the lock ball receiving portion 64 because a force to enter the inner side (piston 63 side) is acting. In the case of a one-step taper, the inclination angle of the lock ball receiving portion 64 is constant. Therefore, as shown in FIG. 13B, the downward movement amount of the lock ball receiving portion 64, that is, the piston movement amount, and the lock ball receiving portion. The relationship with the movement amount is a proportional relationship.

In such a one-step taper, for example, when a small amount of creep occurs in the fusible alloy 62 due to secular displacement or the like, the amount of movement of the lock ball when the amount of movement of the piston is small and the heat of the fire are received. Thus, the amount of increase in the amount of movement of the rock ball when the amount of movement of the piston is large, such as when the soluble alloy 62 is dissolved, is the same. Further, it is necessary to increase the movement amount of the piston in order to secure the movement amount of the lock ball.
Therefore, if the inclination angle of the lock ball receiving portion 64 is gently formed in order to improve the quick movement in the event of a fire, the lock ball 71 is released due to creep over time, and malfunction is likely to occur. In addition, if the inclination angle is formed steeply to prevent malfunction, the rapidity in the event of a fire is reduced.

Next, the relationship between the piston movement amount and the lock ball movement amount in the first embodiment will be described.
FIG. 14 is a diagram for explaining the relationship between the piston movement amount and the rock ball movement amount according to the first embodiment of the present invention. As shown in FIG. 14A, in the present embodiment, the inclined surface of the lock ball receiving portion 64 includes a first inclined surface 65 and a second inclined surface 66, and the inclination angle of the first inclined surface 65. However, the second inclined surface 66 is formed so as to be steeper than the inclination angle of the second inclined surface 66, in other words, the second inclined surface 66 is formed to have a gentle inclination.

  In such a two-step tapered lock ball receiving portion 64, when the movement amount of the piston 63 is small, the first inclined surface 65 and the lock ball 71 abut, and when the movement amount of the piston 63 is large, 2 The inclined surface 65 and the lock ball 71 abut. That is, as shown in FIG. 14B, the amount of increase in the amount of movement of the lock ball is small when the amount of movement of the piston is small, such as when a small amount of creep occurs in the fusible alloy 62 due to, for example, secular displacement. Further, since the downward force of the piston 63 is reduced by the inclination angle, it is difficult to creep. The amount of increase in the amount of movement of the lock ball is large when the amount of movement of the piston is large, such as when the fusible alloy 62 is melted by the heat of the fire.

  As described above, in the present embodiment, since the lock ball receiving portion is provided with the two inclined surfaces having different inclination angles, the movement amount of the lock ball 71 can be set according to the piston movement amount. Further, since the inclination angle of the first inclined surface 65 is steeper than the inclination angle of the second inclined surface 66, the movement amount of the lock ball 71 in the movement of the piston 63 due to the secular displacement of the fusible alloy 62. Can be reduced, and malfunction can be prevented. Further, when the fusible alloy 62 is melted by the heat of the fire and the piston 63 is thermally actuated, the amount of movement of the lock ball 71 can be increased, and when the fire occurs, it can be actuated quickly. .

  In the present embodiment, the case where the inclined surface of the lock ball receiving portion 64 has two steps has been described. However, the present invention is not limited to this, and two or more inclined surfaces may be provided. Further, by arbitrarily setting the inclination angle of each inclined surface, the relationship between the piston movement amount and the lock ball movement amount can be arbitrarily set.

Embodiment 2. FIG.
Hereinafter, although the sprinkler head according to the second embodiment of the present invention will be described, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 15 is a diagram for explaining the relationship between the piston movement amount and the rock ball movement amount according to the second embodiment of the present invention. As shown in FIG. 15A, the lock ball receiving portion 64 according to the second embodiment forms a curved taper 67 such that the contact surface with the lock ball 71 is curved. The curved taper 67 is formed such that the inclination angle of the tangent line becomes steeper toward the outer periphery of the lock ball receiving portion 64. By forming such a curved taper 67, the relationship between the piston movement amount and the lock ball movement amount in the second embodiment is as shown in FIG. 15 (b). The quantity will increase exponentially, for example.
Even with such a configuration, similarly to the first embodiment, it is possible to prevent malfunction due to the secular displacement of the fusible alloy 62, and it is possible to operate quickly when a fire occurs.
As described above, the amount of movement of the lock ball 71 is initially reduced, and the inclined surface of the lock ball receiving portion 64 may be appropriately adjusted so that the amount of movement can be increased from a certain point in time.

  In the first and second embodiments, the case where the guard member 35 is provided has been described. A guard member 35 screwed with the ball support cylinder 31 is provided, and a lower end thereof is located below the fusible alloy 62 and is located on the outer periphery of the fusible alloy 62 so as to receive an external force. For this reason, the thermal decomposition mechanism 30 including the fusible alloy 62 and the valve body 15 supported by the same can be made less susceptible to external forces. Therefore, the thermal decomposition mechanism 30 including the fusible alloy 62 and the valve body 15 supported by the thermal decomposition mechanism 30 can be prevented from being destroyed or deformed by an external impact, and malfunction and water leakage are less likely to occur.

  Further, the guard member 35 is provided with a contact portion 37 that contacts the step portion 12 of the frame 10 so that the external force received by the guard member 35 is transmitted to the frame 10. For this reason, the external force received by the guard member 35 is less likely to be applied to the thermal decomposition mechanism 30 or the valve body 15, and the thermal decomposition mechanism 30 including the fusible alloy 62 and the valve body 15 supported thereby are destroyed by external impact. Alternatively, deformation can be prevented to make it difficult to cause malfunction or water leakage.

  The guard member 35 has an inner peripheral surface screwed into the ball support cylinder 31 and an outer peripheral surface abutted against the frame 10 by the abutting portion 37 to close the gap between the thermal decomposition mechanism 30 and the frame 10. 10 is sealed inside. For this reason, since the inside of the frame 10 (and the head body 1) has a sealed structure, the lock ball 71, the soluble alloy 62, and the like of the thermal decomposition mechanism 30 may be corroded even when installed in a highly corrosive atmosphere. Absent.

  Further, by providing the guard member 35 on the inner side of the frame 10, it is possible to receive an external force closer to the fusible alloy 62, and to prevent the thermal decomposition mechanism 30 including the fusible alloy 62 from receiving the external force. it can.

  Moreover, even if it is a case where the above guard members 35 are provided and the soluble alloy 62 is located above the lower end part of the guard members 35, the inclined surface which inclines the heat sensitive plate 42 toward the soluble alloy 62. 45, the hot airflow flows into the gap between the lower portion 46 of the heat sensitive plate 42 and the lower end of the guard member 35, rises along the inclination of the inclined surface 45, and directly hits the cylinder 41. Thus, the cylinder 41 can be heated. Therefore, even if the fusible alloy 62 is not provided outside the head, the heat receiving efficiency can be improved.

In the first and second embodiments, the case where the guard member 35 is screwed into the ball support cylinder 31 has been described. However, the present invention is not limited to this, and the guard member 35 is formed integrally with the ball support cylinder 31. Anyway.
In addition, although it demonstrated using the sprinkler head provided with both the heat sensitive board which has an inclined surface, and a guard member in embodiment, since these are arbitrary structures in this invention, you may abbreviate | omit.
In addition, the guard member is positioned on the outer periphery of the thermal element, but this does not have to be the entire periphery, and may guard only the outer peripheral portion in a specific direction. In particular, in the guard member, the portion protruding from the lower end of the frame may be omitted, and the heat sensitive element may be directly exposed to the hot air flow. In this case, the heat sensitive plate can be constituted by a horizontal flat plate. In addition, the thermal plate only needs to be formed as a result of an inclined surface for flowing a hot air flow toward the thermal element, and is not bent. For example, a flat thermal plate and an inclined thermal plate are welded together. They may be joined and integrated.

It is a longitudinal cross-sectional view which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the head main body of FIG. It is a longitudinal cross-sectional view of the frame of FIG. It is a longitudinal cross-sectional view of the valve body of FIG. It is a figure which shows the deflector assembly of FIG. It is a figure which shows the thermal decomposition mechanism of FIG. The piston of FIG. 1 is shown, (a) is a top view, (b) is sectional drawing. FIG. 2 shows the heat sensitive plate of FIG. 1, wherein (a) is a plan view and (b) is a cross-sectional view. It is an external view of FIG. It is operation | movement explanatory drawing which concerns on Embodiment 1 of this invention. It is operation | movement explanatory drawing which concerns on Embodiment 1 of this invention. It is operation | movement explanatory drawing which concerns on Embodiment 1 of this invention. It is a figure explaining the relationship between the piston movement amount and rock ball movement amount in the case where the lock ball receiving portion is a one-step taper. It is a figure explaining the relationship between the piston movement amount and lock ball movement amount which concern on Embodiment 1 of this invention. It is a figure explaining the relationship between the piston movement amount and rock ball movement amount which concern on Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Head main body, 2 Outlet, 3 Thread part, 4 Flange, 5 Thread part, 6 Cylindrical part, 7 hole, 8 Groove part, 9 Outlet edge, 10 Frame, 11 Female thread part, 12 Step part, 15 Valve body , 20 Deflector assembly, 21 Deflector, 23 Strut, 25 Stopper ring, 30 Thermal decomposition mechanism, 31 Ball support cylinder, 32 Insertion hole, 35 Guard member, 37 Abutting part, 38 Notch, 40 Thermal part, 41 Cylinder, 42 Heat sensitive plate, 43 connecting hole, 44 upper part, 45 inclined surface, 46 lower part, 51 main body part, 52 head part, 53 upper surface, 54 step part, 62 fusible alloy, 63 piston, 64 rock ball receiving part, 65 first inclination Surface, 66 second inclined surface, 67 curved surface taper, 71 rock ball.

Claims (3)

A head body having a water outlet, a valve body that closes the water outlet, and a thermal decomposition mechanism that supports the valve body, wherein the thermal decomposition mechanism prevents the detachment from the head body, and In a sprinkler head composed of a piston formed with a lock ball receiving portion for supporting a lock ball, and a thermal element provided below the piston and melted by heat,
The lock ball receiving portion is provided with an inclined surface with which the lock ball abuts,
The locking inclined surface of the ball receiving part, sprinkler head, wherein the tilt angle is composed of different at least two stages or more inclined surfaces.   2. The sprinkler head according to claim 1, wherein the rock ball receiving portion of the piston has an inclination angle of an inclined surface at a first stage larger than an inclination angle of an inclined surface after the second stage. A head body having a water outlet, a valve body that closes the water outlet, and a thermal decomposition mechanism that supports the valve body, wherein the thermal decomposition mechanism prevents the detachment from the head body, and In a sprinkler head composed of a piston formed with a lock ball receiving portion for supporting a lock ball, and a thermal element provided below the piston and melted by heat,
A sprinkler head, wherein the lock ball receiving portion is provided with a curved taper that becomes steep as the contact surface with the lock ball moves toward the outer periphery.

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