JP2014121357A - Sprinkler fire-extinguishing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sprinkler fire-extinguishing system which does not prevent a fall of a valve body when a thermosensitive degradation mechanism drops and has a ceiling plate which is hardly detached from a sprinkler head in the sprinkler fire-extinguishing system of a negative pressure type.SOLUTION: A ceiling plate 120 has a plurality of window parts 123 on a cylindrical part 122 mounted on an outer peripheral surface of a frame 70. In a state where the ceiling plate 120 is mounted on a proper mounting position in a sprinkler head 2, an opening part 72 of the frame 70 is opened by the window parts 123 so that a negative pressure environment which prevents a fall of a valve body 80 in association with a drop of a thermosensitive degradation mechanism 100 of the sprinkler head 2 is not created inside the frame 70. In addition, an engaging protrusion 125 provided on an inner peripheral surface of an engaging piece 124 formed between the adjacent window parts 123 engages a groove 73 provided on an outer peripheral surface of the frame 70 for mounting the ceiling plate 120 on the sprinkler head 2.

Description

  The present invention relates to a sprinkler fire extinguishing system.

  Conventionally, as a sprinkler head used in a sprinkler fire extinguishing system, for example, a head body having a water outlet inside, a cylindrical frame provided below the head body, a valve body that closes the water outlet, and a valve body are supported. A device having a thermal decomposition mechanism has been proposed. The thermal decomposition mechanism of the sprinkler head includes a thermal part for collecting heat from a hot air flow generated at the time of a fire, and the thermal part protrudes from the lower end of the frame.

  This type of sprinkler head is connected to a pipe disposed above the ceiling panel through an attachment hole provided in the ceiling panel. When the sprinkler head is connected to the pipe in this way, the thermal decomposition mechanism protrudes below the ceiling panel in order to improve the efficiency of collecting heat from the hot air flow generated in the event of a fire. Yes. In order to improve the appearance, a ceiling plate that hides the mounting holes of the ceiling panel is detachably attached to the head body.

  In the sprinkler fire extinguishing system configured as described above, when an earthquake occurs and the ceiling panel and the sprinkler head move separately, for example, vertically due to vibration, the sealing plate is detached from the sprinkler head and falls. As a result, the thermal decomposition mechanism hits the ceiling panel, breaks and falls, causing the sprinkler head to operate and causing water loss due to water discharge.

  In order to solve this problem, there is a conventional technique for preventing the sealing plate from dropping (see, for example, Patent Document 1). In Patent Document 1, the sealing plate includes an annular collar portion that covers the gap between the sprinkler head and the mounting hole from the lower side, and extends upward from the central opening of the collar portion along the outer circumferential surface of the sprinkler head. It is composed of a cylindrical part that covers the surface, and a locking piece discharged inside is provided on the upper part of the cylindrical part, and the locking piece is locked to a flange part provided below the head body to prevent the sealing plate from falling. I try to figure it out.

  In Patent Document 1, it is assumed that the sealing plate is attached to a so-called pressure-type sprinkler fire extinguishing system in which a pipe to which a sprinkler is connected is filled with pressurized water. However, in the pressurized sprinkler fire extinguishing system, when the sprinkler head is damaged and the thermal decomposition mechanism falls, water is discharged even if it is not a fire.

  Therefore, in recent years, a negative pressure type sprinkler fire extinguishing system has been proposed in which the inside of the pipe to which the sprinkler is connected has a negative pressure so that water is not discharged even if the sprinkler head fails and the thermal decomposition mechanism falls. (For example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 9-262312 (Claims, FIG. 1) JP 2010-233598 A (Claims, FIG. 1)

  In the negative pressure type sprinkler fire extinguishing system, while the inside of the frame becomes atmospheric pressure due to a plurality of openings formed on the outer peripheral surface in the normal monitoring state, negative pressure from the piping acts on the upper surface side of the valve body. The force that pulls up the valve body is working. For this reason, when the thermal decomposition mechanism is dropped in the event of a fire, a spring is provided to push down the valve body so that the valve body can be lowered against the negative pressure.

  When the sealing plate of Patent Document 1 is used in such a negative pressure type sprinkler fire extinguishing system, the following problems occur. That is, since the opening provided in the frame is closed by the cylindrical portion of the sealing plate, the inside of the frame becomes a negative pressure environment after the operation of the sprinkler head, and further upward force acts on the valve body. This upward force overcomes the spring force of the spring, and there arises a problem that even if the thermal decomposition mechanism drops, the valve body does not drop to a predetermined position.

  In the negative pressure type sprinkler system, a breakage (failure) of the sprinkler is detected by a sudden increase in the pressure in the pipe, which is a negative pressure, and a failure signal is generated. For this reason, when the valve body does not descend to a predetermined position, the pressure increase in the pipe due to the inflow of air from the water discharge port becomes slow, and there is a problem that it is impossible to detect a failure of the sprinkler head.

  In order to solve this, it is conceivable to review the structure of the sealing plate so as not to prevent the lowering of the valve body when the thermal decomposition mechanism falls. However, neither of Patent Documents 1 and 2 discusses such a structure. Further, the sealing plate is also required to have a structure that is difficult to come off from the sprinkler head, and no technology has been found for a sealing plate that can achieve both of these.

  The present invention has been made to solve the above-described problems, and in a negative pressure type sprinkler fire extinguishing system, a sealing that does not prevent the valve body from dropping when the thermal decomposition mechanism falls and does not easily come off from the sprinkler head. It aims at providing the sprinkler fire extinguishing system provided with the plate.

  A sprinkler fire extinguishing system according to the present invention includes a pipe whose inside is maintained at a negative pressure in a monitoring state, a head body having a water outlet, a cylindrical frame having an opening, a water outlet, and a water outlet. It is equipped with a valve body that closes and a thermal decomposition mechanism that supports the valve body, and when the thermal decomposition mechanism falls, the valve body is configured to descend against the negative pressure in the piping, and is installed on the ceiling panel In a sprinkler fire extinguishing system comprising a sprinkler head connected to a pipe through a hole and a sealing plate that covers the gap between the sprinkler head and the mounting hole of the ceiling panel from below, the sealing plate is a gap between the sprinkler head and the mounting hole. A ring-shaped collar portion that covers from below and a cylindrical portion that extends upward from the central opening of the collar portion and is attached to the outer peripheral surface of the frame. The cylindrical portion has a plurality of window portions formed by cutting a plurality of end-side end surfaces at intervals in the circumferential direction, and a portion between adjacent window portions is used for attaching the sealing plate to the frame. The sealing plate is attached to the sprinkler head by engaging the locking projection provided on the inner peripheral surface of the locking piece with the groove provided on the outer peripheral surface of the frame, and the sealing plate is attached to the sprinkler head. The opening of the frame is opened at the window so that a negative pressure environment is not formed in the frame that prevents the valve body from dropping due to the falling of the thermal decomposition mechanism when the head is mounted at the normal mounting position. It is a thing.

  According to the present invention, in a negative pressure type sprinkler fire extinguishing system, it is possible to provide a sprinkler fire extinguishing system including a sealing plate that does not prevent the valve body from being lowered when the thermal decomposition mechanism falls, and is difficult to be detached from the sprinkler head.

It is a figure which shows the structure of the sprinkler fire extinguishing system which concerns on one embodiment of this invention. It is a longitudinal cross-sectional schematic diagram of the sprinkler head in the sprinkler fire extinguishing system of FIG. FIG. 3 is a side view of the sprinkler head of FIG. 2. It is the figure which showed the installation state to the ceiling panel of the sprinkler head in the sprinkler fire extinguishing system of one embodiment of this invention. It is a perspective view of the sealing plate of FIG. FIG. 6 is a side view of the sealing plate of FIG. 5.

FIG. 1 is a diagram showing a configuration of a sprinkler fire extinguishing system according to an embodiment of the present invention.
The sprinkler fire extinguishing system according to the present embodiment includes a sprinkler head 2, a pre-acting valve 22 as an open valve, a primary side pipe 11, a secondary side pipe 12, a vacuum pipe 14, a vacuum pump 24, a running water shut-off valve 31, and head operation detection. It is comprised from the apparatus 46, the vacuum switch 41, the vacuum switch 53, the pressurized water supply apparatus 26, etc.

  The protective section 1 is provided with a plurality of sprinkler heads 2. The protective compartment 1 is provided with a fire detector 3 that detects a fire that has occurred in the protective compartment 1. The fire detector 3 is electrically connected to the fire receiver 4, and the fire receiver 4 receiving the fire alarm of the fire detector 3 sends the fire signal to the fire extinguishing system control panel 5 and the vacuum pump control panel 52. To send to.

  Further, the fire extinguishing system control panel 5 detects, through the relay 51, a remote start valve 22b, which is an electric pilot valve that drives the pre-actuating valve 22, and water flow for extinguishing water due to the opening of the pre-acting valve 22. The signal switch 22a, the release valve 47, the vacuum switch 41, and the head operation detector 46 are electrically connected. The fire extinguishing system control panel 5 is activated by either the vacuum switch 41 that operates at a predetermined pressure or the head operation detection device 46 that operates when the pressure increase per unit time exceeds a predetermined value. It is determined whether the head 2 is activated.

  The plurality of sprinkler heads 2 are each connected to a falling pipe 13. Further, each of the falling pipes 13 is connected to the secondary side pipe 12. One end of the secondary side pipe 12 is connected to one end of the pre-actuating valve 22 that is normally closed and is electrically opened in the event of a fire. The other end of the pre-actuating valve 22 is connected to one end of the primary side pipe 11. The other end (base end side) of the primary side pipe 11 is connected to a discharge port of a pressurized water supply device 26 that has water supply amount control means and is inverter-controlled. The pressurized water supply device 26, the primary side pipe 11, and the pre-actuating valve 22 constitute a water supply device.

  On the other hand, the other end of the secondary side pipe 12 is connected to one end of the end test valve 25. A drain pipe 16 is connected to the other end of the terminal test valve 25. The water filled in the secondary side pipe 12 by a water leak test or the like of the sprinkler fire extinguishing system is discharged to the outside by opening drain valves (not shown) provided in the end test valve 25 and the pre-actuating valve 22. In the normal monitoring state, the end test valve 25 is closed.

  In addition, one end of a vacuum pipe 14 is connected to the secondary side pipe 12. A vacuum pump 24 is connected to the other end of the vacuum pipe 14.

  The vacuum pipe 14 includes a flowing water shut-off valve 31, a vacuum switch 41, and a pressure rise at a predetermined value from the connection side with the secondary side pipe 12 toward the vacuum pump 24 side. The head operation detection device 46 and the orifice 42 that operate as described above are sequentially provided. A vacuum switch 53 is connected to the vacuum pipe 14 between the orifice 42 and the vacuum pump 24, and the internal pressure of the vacuum pipe 14 is set to a predetermined value or less via a vacuum pump control panel 52. The vacuum pump 24 is controlled.

<Operation of sprinkler fire extinguishing system>
In the sprinkler fire extinguishing system according to the present embodiment, in the normal monitoring state, the secondary side pipe 12 is filled with negative pressure water, and the vacuum pump 24 is started to activate the inside of the secondary side pipe 12 and the vacuum. The inside of the pipe 14 has a negative pressure lower than the atmospheric pressure.

  The operation of this sprinkler fire extinguishing system will be described below. First, the operation for detecting the operation of the sprinkler head 2 will be described. Next, the fire extinguishing operation of the sprinkler fire extinguishing system will be described.

(Sprinkler head operation detection operation)
As described above, in the normal monitoring state, the secondary side pipe 12 and the vacuum pipe 14 have negative pressure. In these secondary side pipes 12 and vacuum pipes 14, air gradually flows in from the connecting part of the falling pipe 13 and the sprinkler head 2, and the negative pressure in the pipe rises (approaches atmospheric pressure). Come).

  When the vacuum switch 53 detects that the negative pressure in the secondary side pipe 12 and the vacuum pipe 14 is equal to or higher than a predetermined pressure, the vacuum pump 24 is operated, and the secondary side pipe 12 and The negative pressure in the vacuum pipe 14 is maintained at a pressure below a certain level. In addition, when the pressure in the secondary side pipe | tube 12 which is a negative pressure rises, there exists a case by the action | operation of the sprinkler head 2 and the case by the air inflow from piping. Here, the pressure increase due to the inflow of air from the pipe is detected by the vacuum switch 53, and the pressure increase due to the operation of the sprinkler head 2 is detected by the head operation detection device 46 or the vacuum switch 41.

  When a fire occurs in the protection section 1 and the sprinkler head 2 operates (when the water outlet 61 of the sprinkler head 2 is opened), the water outlet 61 of the sprinkler head 2 enters the secondary side pipe 12 and the vacuum pipe 14. Air in the protective compartment 1 flows in. Thereby, the pressure in the secondary side piping 12 and the vacuum piping 14 which are negative pressures rises.

  When air flows in from a pipe connection part or the like under normal conditions, the pressure increase rate in the secondary side pipe 12 and the vacuum pipe 14 which are negative pressures is small. That is, the amount of change per predetermined time in the normal state is small. On the other hand, when the sprinkler head 2 is operated, the pressure increase rate in the secondary side pipe 12 and the vacuum pipe 14 which are negative pressures is larger than that in the normal monitoring state. That is, the amount of change in pressure per predetermined time when the sprinkler head is activated is greater than in normal times.

  The head operation detection device 46 detects the operation of the sprinkler head 2 based on this difference in the pressure change amount per predetermined time. In other words, in the head operation detection device 46, the absolute value of the change amount per predetermined time of the pressure in the secondary side pipe 12 and the vacuum pipe 14 (detected value of the vacuum switch 41), which is negative pressure, is greater than the predetermined threshold value. When it becomes larger, it is determined that the sprinkler head 2 is activated.

  In the present embodiment, when the sprinkler head 2 is operated during the operation of the vacuum pump 24, the pressure of the secondary side pipe 12 does not change and the head operation detection device 46 is prevented from operating. An orifice 42 is provided in the vacuum pipe 14 between the operation detector 46 and the vacuum pump 24. In the present embodiment, when the fire detector 3 detects a fire, the operation of the vacuum pump 24 is stopped, or the vacuum pump 24 is not started even if the pressure in the vacuum pipe 14 increases when a fire is detected. To control. For this reason, it is not always necessary to provide the orifice 42.

(Explanation of fire extinguishing system operation)
Next, the fire extinguishing operation of the sprinkler fire extinguishing system will be described. In the monitoring state, the pressurized water is filled up to the pre-actuating valve 22 of the primary side pipe 11, and the secondary side pipe 12 is filled with negative pressure water.

  When a fire occurs in the protective zone 1, the fire detector 3 detects the fire. The fire receiver 4 transmits a fire signal to the fire extinguishing system control panel 5. After that, when the sprinkler head 2 is actuated and the pressure of the secondary side pipe 12 which is a negative pressure increases, the fire extinguishing system control panel 5 determines the sprinkler head based on the amount of pressure change per predetermined time in the head operation detecting device 46. 2 operation is detected. When both the fire signal and the operation of the sprinkler head 2 are detected, the fire extinguishing system control panel 5 opens the pre-actuating valve 22 by opening the remote start valve 22b. As a result, pressurized water is supplied to the secondary side pipe 12 and discharged from the sprinkler head 2 to the protection section 1 via the falling pipe 13, and the fire generated in the protection section 1 is extinguished.

(Sprinkler head)
Next, the sprinkler head 2 provided in the sprinkler fire extinguishing system will be described.

  2A and 2B are schematic longitudinal sectional views of the sprinkler head in the sprinkler fire extinguishing system of FIG. 1, in which FIG. 2A shows a normal monitoring state and FIG. 2B shows an operating state. FIG. 3 is a side view of the sprinkler head of FIG. Hereinafter, first, a sprinkler head structure in a normal monitoring state will be described with reference to FIGS. FIG. 2B will be described later (Explanation of the operation of the sprinkler head during a fire).

  The sprinkler head 2 includes a head main body 60, a frame 70, a valve body 80, a deflector assembly 90, a thermal decomposition mechanism 100, and the like.

  The head main body 60 has a water outlet 61 through which fire-extinguishing water is discharged in the center. A screw portion for connecting to the falling pipe 13 is formed on the outer periphery of the upper portion of the head body 60. A female screw is formed inside the flange portion 62 at the lower portion of the head main body 60, and the upper portion of the cylindrical frame 70 is screwed thereto. A locking step 71 projecting inward is formed at the lower end of the inner wall of the frame 70.

  The frame 70 has a plurality of openings 72 having the same shape. Here, two openings 72 are formed at positions facing each other. The opening 72 is provided, for example, for a leak test for examining whether a leak has occurred from the water outlet 61 through the valve body 80. In the leak test, the sprinkler head 2 is submerged in water, and it is checked whether air leaking from the valve body 80 appears as bubbles from the opening 72. A spiral groove 73 for locking a sealing plate 120 (see FIG. 4) described later is formed on the outer peripheral surface of the frame 70.

  The valve body 80 has a convex portion 81 and a flange portion 82 extending outward from the lower portion of the convex portion 81, and the convex portion 81 is inserted into the water outlet 61, and the lower end of the water outlet 61 is defined by the flange portion 82. It is blocking.

  The deflector assembly 90 includes a deflector 91, a guide rod 92, and a stopper ring 93. The deflector 91 is configured by a disc having an opening at the center, and the valve body 80 in a state in which an insertion portion 83 formed at a lower portion of the flange portion 82 of the valve body 80 is inserted into the opening. Are attached to the lower surface of the flange portion 82. The deflector 91 has an insertion hole into which the guide rod 92 is inserted. Normally, the lower portion of the guide rod 92 is housed in the frame 70 in a state of protruding downward from the insertion hole of the deflector 91.

  In the monitoring state, the lower surface of the stopper ring 93 is in a position where it is pressed by the spring 63 and substantially overlaps the upper surface of the deflector 91. In the event of a fire, the stopper ring 93 is pushed downward by the pressing force of the spring 63, and the deflector 91 is guided by the guide rod 92 and descends. Then, when the stopper ring 93 fixed to the upper end of the guide rod 92 is engaged with the engagement step portion 71, the deflector 91 stops at a predetermined position exposed from the lower end of the frame 70.

  The thermal decomposition mechanism 100 is provided below the valve body 80, always supports the valve body 80, and is decomposed by heat and dropped in the event of a fire. When the thermal decomposition mechanism 100 is disassembled, the valve body 80 that has blocked the water outlet 61 is opened. In the present embodiment, after opening the valve body 80, the valve body 80 descends against the suction force by the secondary side pipe 12 under a negative pressure environment.

  The thermal decomposition mechanism 100 includes a thermal screw 101, a ball 102, a balancer 103, a slider 104, and a set screw 105 that supports a valve body 80. The heat sensitive body 101 is solder or the like, and a force is applied so as to be compressed from the balancer 103. The ball 102 is maintained in a locked state at three points: a balancer 103, a slider 104, and a locking step 71 at the lower end of the frame 70. Although the ball 102 is applied with an inward force, the ball 102 is held in a state of being locked to the locking step portion 71 because it is held between the balancer 103 and the slider 104.

(Explanation of sprinkler head operation in case of fire)
Next, the operation | movement at the time of the fire of the sprinkler head in this Embodiment is demonstrated using Fig.2 (a) and FIG.2 (b). In the event of a fire, the heat sensitive body 101 is melted by the heat of the fire and flows out. The balancer 103 applying a force to compress the heat sensitive body 101 is lowered according to the outflow amount of the heat sensitive body 101. When the balancer 103 is lowered, the gap with the slider 104 is widened, the ball 102 biased inward is moved inward, and the locking between the ball 102 and the locking step portion 71 of the frame 70 is released. Then, the balancer 103 and the slider 104 are dropped, and the thermal decomposition mechanism 100 is all dropped.

  When the thermal decomposition mechanism 100 is detached from the frame 70 and dropped, the stopper ring 93 is lowered along with the guide rod 92 along the inner surface of the frame 70. The stopper ring 93 is locked to the locking step 71 of the frame 70, and the deflector 91 is guided and lowered by the guide rod 92 attached to the deflector 91. As shown in FIG. The guide rod 92 is suspended from the frame 70. At this time, since the valve body 80 is integrally formed on the deflector 91, the valve body 80 is also lowered together with the deflector 91. And fire extinguishing water is discharged from the water outlet 61.

(Explanation of sprinkler head installation state)
Next, the installation state of the sprinkler head 2 will be described.

  FIG. 4 is a diagram showing an installation state of the sprinkler head on the ceiling panel in the sprinkler fire extinguishing system according to the embodiment of the present invention. In FIG. 4, the sealing plate 120 is indicated by a solid line, and the others are indicated by a dotted line.

  The sprinkler head 2 is installed in a mounting hole 201 provided in the ceiling panel 200 so that the head body 60 is located above the ceiling surface 202 and the thermal decomposition mechanism 100 is located below the ceiling surface 202. Yes. A sealing plate 120 is provided so as to cover the gap between the sprinkler head 2 and the mounting hole 201.

  The sealing plate 120 is attached to the outer peripheral surface of the frame 70 extending upward from a central opening provided at the center of the collar 121 and an annular collar 121 that covers the gap between the sprinkler head 2 and the mounting hole 201 from below. And a substantially cylindrical cylindrical portion 122.

(Structure of sealing plate)
The present invention is characterized by a sealing plate structure that can surely lower the valve body 80 when the sprinkler head 2 breaks down and the thermal decomposition mechanism 100 falls during a non-fire, and is difficult to come off from the sprinkler head 2. Hereinafter, the structure of the characteristic part will be described.

FIG. 5 is a perspective view of the sealing plate of FIG. 4, and FIG. 6 is a side view of the sealing plate of FIG.
The cylindrical portion 122 of the sealing plate 120 has a plurality of window portions 123 formed by cutting a plurality of, substantially rectangular shapes, at the distal end side end surface 122a at intervals in the circumferential direction. The plurality of window portions 123 have the same shape and are formed at equal intervals in the circumferential direction, and portions between adjacent window portions 123 are the same for removably locking the sealing plate 120 to the outer periphery of the frame 70. The locking piece 124 has a shape. On each inner peripheral surface of each locking piece 124, a locking protrusion 125 that locks in a spiral groove 73 provided on the outer periphery of the frame 70 is formed so as to extend in the circumferential direction. The length of the opening in the vertical direction of the window portion 123 is longer than the length from the lower surface of the flange 62 of the sprinkler head 2 to the lower end of the opening 72. Thereby, even if the sealing plate 120 is pushed deeply into the sprinkler head 2 to the maximum extent, the lower end of the opening 72 is exposed from the window 123.

  The locking piece 124 has a spring property in the radial direction by notching both sides in the circumferential direction. When the sealing plate 120 is mounted on the frame 70, the locking piece 124 is slightly bent outward and mounted on the frame 70. It is easy to do. Note that the number of the locking pieces 124 is preferably selected in consideration of this point, because the spring property of the locking pieces 124 decreases as the circumferential length increases. Further, a slight notch 123a is provided in the center of the bottom side of the window 123 in the vertical direction so that the spring property of the locking piece 124 can be further expanded.

  In addition, as shown in FIG. 4, the opening 72 of the frame 70 is opened by a predetermined amount or more (not covered by the locking piece 124) in a state where the sealing plate 120 is mounted at a regular mounting position in the sprinkler head 2. It is said. That is, the sealing plate structure is configured such that the window portion 123 opens the opening 72 of the frame 70 so that a negative pressure environment that prevents the valve body from being lowered when the thermal decomposition mechanism is dropped is not formed in the frame 70. Specifically, the circumferential width W2 of the window portion 123 is set so as to open the opening 72 of the frame 70 by a half or more of the circumferential width W1 thereof. Here, the proper mounting position of the sealing plate 120 on the sprinkler head 2 is a position where the sealing plate 120 is pushed in until the front end side end surface 122a of the locking piece 124 contacts the bottom surface 62a of the flange portion 62 of the head body 60. That is.

  When the sealing plate 120 is attached to the sprinkler head 2, the sealing plate 120 is pushed into the outer periphery of the frame 70 from the lower side and attached. That is, the sealing plate 120 is moved upward regardless of the spiral direction of the groove 73 in a state where the tip of the locking piece 124 is slightly outwardly extended by utilizing the spring property of the locking piece 124. Then, as shown in FIG. 4, the sealing plate 120 is pushed in and mounted to the mounting position where the top surface of the sealing plate 120 and the ceiling surface 202 abut. In the present embodiment, a case where the sealing plate 120 is mounted at a regular mounting position will be described. In a state where the sealing plate 120 is located at the regular mounting position, the locking protrusion 125 provided on the locking piece 124 is locked at any position of the spiral of the groove 73, for example, at the upper end side, and the sealing plate 120 is sprinklered. The head 2 is detachably mounted.

  When the sealing plate 120 is attached to the sprinkler head 2 in this way, the window portion 123 is provided so that the opening 72 of the frame 70 can be opened more than a predetermined amount regardless of the direction in which the sealing plate 120 is attached. Specifically, in the case where the opening 72 of the frame 70 is opened by 1/2 or more of the circumferential width W1, the circumferential width W2 of the window 123 is set to the circumferential width W1 of the opening 72. And / or the circumferential width W3 of the locking piece 124 (see FIG. 6) may be ½ or less of the circumferential width W1 of the opening 72.

  The windows 123 and the locking pieces 124 having such a dimensional design are alternately formed in the circumferential direction, so that the opening 72 is not less than a predetermined amount no matter where the sealing plate 120 is attached to the frame 70. (That is, 1/2 or more of the width W1 in the circumferential direction) can be opened. Here, it is assumed that the opening 72 is opened by ½ or more of the circumferential width W1. However, when the opening 72 is opened by 2/3 or more, it is more preferable in terms of suppressing the negative pressure environment in the frame 70. In this case, the circumferential width W2 of the window 123 is 2/3 or more of the circumferential width W1 of the opening 72 and / or the circumferential width W3 of the locking piece 124 (see FIG. 6) is the opening. It may be set to 1/3 or less of the circumferential width W1 of 72.

  Then, when removing the sealing plate 120 from the sprinkler head 2 at the time of inspection, for example, the sealing plate 120 may be rotated and the locking projection 125 may be lowered along the spiral groove 73 and removed. Note that when the sealing plate 120 is mounted on the sprinkler head 2, the sealing plate 120 may be mounted along the groove 73. However, since a plurality of sprinkler heads 2 are usually installed together, for example, at the time of building construction, from the viewpoint of workability, the sprinkler head 2 may be installed by pushing upward in the spiral direction of the groove 73 as described above. It is common. For this reason, it is very effective to configure the sealing plate 120 in consideration of such a working mode. Note that the groove 73 has a spiral shape and can be removed by rotating the sealing plate 20 as described above. However, the groove 73 is not limited to a spiral shape, and may be, for example, an annular shape. When the groove 73 is annular, the sealing plate 120 cannot be rotated and removed, but the sealing plate 120 is hardly detached from the sprinkler head 2 and the external force resistance is improved.

(Explanation of sprinkler fire extinguishing system operation (at the time of failure))
The normal operation of the sprinkler fire extinguishing system is as described above, but hereinafter, the operation of the sprinkler fire extinguishing system when the thermal decomposition mechanism 100 is dropped due to a failure or the like will be described again, focusing on the action of the sealing plate 120.

  As described above, the sealing plate 120 of the present embodiment opens the opening 72 of the frame 70 at a predetermined level or more while being pushed into the sprinkler head 2 to the maximum. Therefore, a negative pressure environment that prevents the valve body from dropping when the thermal decomposition mechanism drops is not formed in the frame 70. For this reason, when the sprinkler head 2 is damaged and the thermal decomposition mechanism 100 is dropped, the valve body 80 can be lowered. Depending on the positional relationship between the ceiling surface 202 and the sprinkler head 2, the sealing plate 120 may be attached to the sprinkler head 2 below the normal mounting position, unlike FIG. 4. Even in this case, since the sealing plate 120 has the window portion 123, the opening 72 is not blocked by the sealing plate 120.

  When the valve body 80 is lowered, the water outlet 61 closed by the valve body 80 is opened, and air flows into the secondary side pipe 12 and the vacuum pipe 14 from the water outlet 61. As a result, the negative pressure in the secondary side pipe 12 and the pressure in the vacuum pipe 14 suddenly increased, and the sprinkler head 2 was operated by the head operation detection device 46 (the valve body 80 dropped and the water outlet 61 Is released).

  Here, since the operation of the sprinkler head 2 is caused by breakage (failure) of the sprinkler head 2, only the operation of the sprinkler head 2 is detected by the fire extinguishing system control panel 5, and no fire signal is input. For this reason, the fire extinguishing system control panel 5 does not open the pre-actuating valve 22 but generates a failure signal and transmits it to the fire receiver 4 to notify the failure of the sprinkler head 2. In this way, the pre-actuating valve 22 is not opened during the operation of the sprinkler head 2 due to the failure of the sprinkler head 2, and the secondary side pipe 12 remains filled with negative pressure water. For this reason, even if the thermal decomposition mechanism 100 falls and the valve body 80 descends, water is not discharged from the sprinkler head 2.

(effect)
As described above, according to the present embodiment, the valve body can be reliably lowered when the thermal decomposition mechanism 100 is dropped when the sprinkler head 2 breaks down. A sprinkler fire extinguishing system can be obtained.

  Moreover, the following effects are acquired by making the circumferential width W2 of the window part 123 into 1/2 or more of the circumferential width W1 of the opening 72. That is, even if the window portion 123 of the sealing plate 120 is attached to the frame 70 from any position relative to the opening 72 of the frame 70, the negative pressure that prevents the valve body 80 from descending in the frame 70. An environment can be prevented from being formed.

  In addition, since the locking portion where the locking projection 125 of the sealing plate 120 is locked is a spiral groove 73, the groove 73 is regarded as a structure in which a plurality of concave portions are provided adjacent to each other in the vertical direction. You can also. Therefore, assuming that the sealing plate 120 is pushed downward by an external force, each of the plurality of recesses functions as a locking portion, and is less likely to come off compared to a configuration in which the locking portion is one place.

  Moreover, since the front end side end surface 122a of the locking piece 124 has a flat shape, the external force resistance and the rigidity can be improved as compared with, for example, a tapered shape. For this reason, it is possible to obtain the sealing plate 120 that is resistant to breakage of the locking piece 124 when an external impact is applied. Further, when the sealing plate 120 is mounted on the frame 70, as described above, the sealing plate 120 is pushed upward regardless of the spiral direction of the groove 73, and the lower surface of the flange 62 and the front end side end surface 122a of the locking piece 124 collide. Therefore, a certain degree of strength is required at the tip of the locking piece 124. Therefore, by making the tip flat, the strength of the sealing plate 120 can be increased, and the failure prevention effect of the locking piece 124 at the time of mounting can be obtained. In addition, since the locking projection 125 can be designed wider than the sealing plate having a tapered locking piece, the locking projection 125 can also be designed wider when an external impact is applied. The locking projection 125 is difficult to break.

  In the present embodiment, the secondary side pipe 12 is filled with negative pressure water, but it is a so-called dry-type facility in which the secondary side pipe 12 is not normally filled with water. The present invention can also be applied to a configuration in which the side pipe 12 has a negative pressure. That is, the present invention can be applied to either a dry facility or a wet facility as long as the secondary side pipe 12 is maintained at a negative pressure.

  In this embodiment, six window portions 123 are provided. However, the number is not limited to six, and the number can be appropriately selected as long as the above-described conditions required for the window portion 123 are satisfied.

  Further, in the present embodiment, the operational effect of the sealing plate 120 when the sprinkler head has failed has been described. However, the sealing plate 120 of the present invention is effective even when a fire occurs. That is, in the present embodiment, the fire extinguishing system control panel 5 opens the pre-actuating valve 22 when both the fire signal and the operation of the sprinkler head (the sudden pressure increase due to the drop of the valve body 80) are detected. is there. For this reason, if the valve body 80 does not descend during a fire, the operation of the sprinkler head 2 is not detected, and the pre-actuating valve 22 is not opened. That is, despite the occurrence of a fire, the pressurized water is not supplied to the secondary side pipe 12, and water discharge is not performed. Therefore, it is effective even in the event of a fire.

  The sprinkler fire extinguishing system of the present invention is not limited to the configuration in which the pre-actuating valve 22 is opened when both the fire signal and the operation of the sprinkler head 2 are detected. The pre-actuating valve 22 may be opened only by either one of the following: a sudden pressure increase due to a decrease of 80). In the case of the configuration in which the pre-actuating valve 22 is opened only by the fire signal, the pre-actuating valve 22 is opened by the fire signal generated by the fire detection of the fire detector 3 and a pressurized water is supplied to the secondary side pipe 12 in the event of a fire. Even if the valve body 80 does not descend, the valve body 80 descends due to the supply of pressurized water. For this reason, although the effect of the sealing plate 120 at the time of a fire is low, it is still effective at the time of a sprinkler head failure.

  1 Protective section, 2 sprinkler head, 3 fire detector, 4 fire receiver, 5 fire extinguishing system control panel, 11 primary side piping, 12 secondary side piping, 13 falling piping, 14 vacuum piping, 16 drainage piping, 22 Actuating valve, 22a Flow water signal switch, 22b Remote start valve, 24 Vacuum pump, 25 Terminal test valve, 26 Pressurized water supply device, 31 Flow water shutoff valve, 41 Vacuum switch, 42 Orifice, 46 Head operation detection device, 47 Release valve, 51 repeater, 52 vacuum pump control panel, 53 vacuum switch, 60 head body, 61 water outlet, 62 flange, 62a bottom, 63 spring, 70 frame, 71 locking step, 72 opening, 73 groove, 80 valve Body, 81 convex portion, 82 flange portion, 83 insertion portion, 90 deflector assembly, 91 deflector, 2 Guide rod, 93 Stopper ring, 100 Thermal decomposition mechanism, 101 Thermosensitive body, 102 Ball, 103 Balancer, 104 Slider, 105 Set screw, 120 Sealing plate, 121 Collar part, 121a Horizontal part, 121b Inclined part, 122 Cylindrical part, 122a Front end side surface, 123 Window portion, 123a Notch portion, 124 Locking piece, 125 Locking protrusion, 200 Ceiling panel, 201 Mounting hole, 202 Ceiling surface.

Claims (4)

A pipe whose inside is kept at a negative pressure in the monitoring state;
A head body having a water outlet, a cylindrical frame provided below the head body and having an opening, a valve body that closes the water outlet, and a thermal decomposition mechanism that supports the valve body, the thermal decomposition When the mechanism falls, the valve body is configured to descend against the negative pressure in the pipe, and a sprinkler head connected to the pipe through a mounting hole provided in a ceiling panel;
In a sprinkler fire extinguishing system comprising a sealing plate that covers a gap between the sprinkler head and the mounting hole of the ceiling panel from below,
The sealing plate has an annular collar portion that covers a gap between the sprinkler head and the mounting hole from below.
A cylindrical portion that extends upward from the central opening of the collar portion and is attached to the outer peripheral surface of the frame;
The cylindrical portion has a plurality of window portions formed by notching a plurality of notches at the distal end side end surface in the circumferential direction,
A portion between the adjacent window portions serves as a locking piece for mounting the sealing plate to the frame,
The sealing plate is attached to the sprinkler head by engaging a locking projection provided on the inner peripheral surface of the locking piece with a groove provided on the outer peripheral surface of the frame, and the sealing plate is attached to the sprinkler head. The opening portion of the frame is opened at the window portion so that a negative pressure environment that prevents the valve body from being lowered due to the dropping of the thermal decomposition mechanism is not formed in the frame in a state where the thermal decomposition mechanism is mounted. Sprinkler fire extinguishing system, characterized in that A plurality of the openings of the frame are formed in the frame,
The sprinkler fire extinguishing system according to claim 1, wherein a width in the circumferential direction of the window portion is set to ½ or more of a width in the circumferential direction of the opening portion. The head body has a flange portion at the bottom,
The front end side end surface of the locking piece of the sealing plate is configured to have a flat shape that contacts the lower surface of the flange portion in a state where the sealing plate is mounted at a normal mounting position of the sprinkler head. The sprinkler fire extinguishing system according to claim 1 or 2.   The sprinkler fire extinguishing system according to any one of claims 1 to 3, wherein a notch portion is formed in a vertical direction at a center portion of a bottom side of the window portion of the sealing plate.

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