JP2022013312A - Sealing cover body for fire extinguisher discharge head - Google Patents

Abstract

To provide a sealing cover body for a fire extinguisher discharge head which prevents the movement of air through the fire extinguisher discharge head, does not interfere with the discharge of a fire extinguisher since the cover body is released at the time of an abnormality, can easily perform an appearance inspection of the fire extinguisher discharge head and the like, and has a low manufacturing cost.SOLUTION: A sealing cover body for a fire extinguisher discharge head is composed of a pedestal member, a cover member, and a packing member. The pedestal member has a bottomed tubular shape having a bottom surface part at one end on the side attached to a ceiling or the like, a hole part with a size corresponding to a shaft diameter of the fire extinguisher discharge head is formed in the bottom surface part, and a sealing member made of an air-impermeable material is arranged on a surface of the bottom surface part which comes into contact with the ceiling or the like. At least a part of the cover member is transparent or translucent, a pedestal member side groove part and a cover member side groove part, into which the packing member can be fitted, are provided on a side wall part outer surface of the pedestal member and a side wall part inner surface of the cover member, and the packing member between the cover member side groove part and pedestal member side groove part enables the cover member to be locked to the pedestal member via the packing member.SELECTED DRAWING: Figure 1

Description

There is an application for exception of loss of novelty

The present invention relates to a sealing cover body for a fire extinguishing agent discharging head for sealing the fire extinguishing agent discharging head in order to make the room airtight.

Conventionally, fire extinguishing equipment such as a sprinkler that detects an abnormality such as a fire in a building and releases a fire extinguishing agent is known. In particular, fire extinguishing equipment that uses foam fire extinguishing agent instead of water is used for buildings where fires caused by oil or chemicals are expected.

Research facilities that handle chemicals often have so-called clean rooms that block the air in the research environment from the outside air, but even in such an environment, it is essential to install foam fire extinguishing equipment. In many foam fire extinguishing equipment, a plurality of fire extinguishing agent discharge heads are attached to the ceiling or the wall surface, and are connected to an external foam fire extinguishing agent storage tank by an empty pipe passing through the ceiling or the inside of the wall surface.

Here, when constructing fire extinguishing equipment, it is stipulated that a predetermined area should be constructed as one section. However, since the area of the clean room is generally not so large, the empty pipe from the foam fire extinguishing agent storage tank is branched and connected not only to the clean room but also to the fire extinguishing agent discharge head of the adjacent room. It is necessary to make the section larger than the specified area. In this case, each fire extinguishing agent discharge head in the clean room and the adjacent room will be connected via a common empty pipe.

By the way, the clean room is set to a positive pressure (a state where the air pressure in the clean room is high) so as to block the indoor air and the outside air and prevent dust and the like from entering the inside. Therefore, when the fire extinguishing agent discharge head is attached, air flows out to the adjacent room through the empty pipe, and there is a problem that it becomes difficult to maintain the air pressure in the clean room.

In this regard, conventionally, a technique has been disclosed in which the fire extinguishing agent discharge head is covered with a sealing cover to maintain airtightness in normal times, and in the event of a fire, the sealing cover can be removed by the release pressure of the fire extinguishing agent to function as a fire extinguishing facility. (See Patent Document 1).

However, with this technology, when performing a legal visual inspection to detect clogging or damage to the fire extinguishing agent discharge head, the cover member was an opaque material, so the cover member was removed one by one for inspection. I had to do it. Especially in a building with a high ceiling, it is necessary to build a scaffolding, and there is a problem that it becomes impossible to substantially perform all visual inspections.

Further, in the technique described in Patent Document 1, when the cover is held by the frictional force between the O-ring and the inner peripheral surface of the cover, the cover may shift and fall due to vibration or the like, while the engaging force by the holding pin is applied. When the cover is held in combination, there is a problem that the structure becomes complicated and the cost increases.

JP-A-2004-275260

Since the fire extinguishing equipment does not operate in normal times, there is a risk of injury by hitting a person if the airtight cover body comes off and falls due to an earthquake or environmental vibration, for example. On the other hand, in the event of an abnormality such as a fire, the function as a fire extinguishing facility cannot be fulfilled unless the cover body is surely removed. Further, if the appearance inspection of the fire extinguishing agent discharge head cannot be surely performed, the function as the fire extinguishing equipment cannot be fulfilled as well. In addition, since the number of fire extinguishing agent discharge heads installed in one building is large, it is required that the manufacturing cost as a cover body is low.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the movement of air through the fire extinguishing agent discharge head, and in the event of an abnormality, the cover body is detached to release the fire extinguishing agent. It is an object of the present invention to provide a sealed cover body for a fire extinguishing agent discharging head, which can easily perform an appearance inspection of a fire extinguishing agent discharging head or the like without hindering the above and has a low manufacturing cost.

The means adopted by the present inventor to solve the above problems will be described as follows.

That is, the sealing cover body for the fire extinguishing agent discharge head of the present invention is composed of a pedestal member, a cover member locked to the pedestal member, and a packing member fitted between the cover member and the pedestal member. To.

Here, the pedestal member has a bottomed tubular shape having a bottom surface portion at one end on the side attached to the ceiling or a wall surface (hereinafter, “ceiling or the like”). Further, in order to sandwich the pedestal member with the ceiling or the like by the fire extinguishing agent discharging head and fix it to the ceiling or the like, a hole having a size corresponding to the diameter of the shaft portion of the fire extinguishing agent discharging head is provided in the bottom surface of the pedestal member. A sealing member made of a non-breathable material was arranged on the surface of the bottom surface in contact with the ceiling or the like.

Further, the cover member is configured to be transparent or translucent so that at least a part of the inside can be visually recognized. Further, the pedestal member can be covered by fitting the side wall portion of the cover member with the side wall portion of the pedestal member. Here, the pedestal member side groove portion and the cover member side groove portion are provided at positions facing each other on the outer surface of the side wall portion of the pedestal member and the inner surface of the side wall portion of the cover member, and the pedestal member side groove portion and the cover member side groove portion are provided. Fit the packing member in between.

Further, by fitting the packing member between the cover member side groove portion and the pedestal member side groove portion, the cover member can be locked to the pedestal member via the packing member.

Further, in the present invention, a chamfer or an angle R may be formed on at least one of the protruding corner portion on the opening side of the cover member side groove portion or the protruding corner portion on the opening side of the pedestal member side groove portion.

Further, the packing member may be an O-ring having a circular cross section.

On the other hand, it is preferable that the cover member is separated from the pedestal member when the pressure of the fire extinguishing agent discharged from the fire extinguishing agent discharging head exceeds 0.1 MPa.

In the present invention, by disposing the packing member between the cover member and the pedestal member, the air inside and outside the cover member is blocked, and the air inside the room air is discharged to the outside through the fire extinguishing agent discharge head arranged inside the cover member. It has the effect of preventing the movement of the air.

Further, by inserting the shaft portion of the fire extinguishing agent discharge head into the hole formed in the bottom surface of the pedestal member and fixing the shaft portion on the back side of the ceiling or the like, the pedestal member can be connected to the ceiling or the like and the fire extinguishing agent discharge head. It is fixed in a state of being sandwiched between and. At this time, by disposing the sealing member on the surface of the bottom surface in contact with the ceiling or the like, the sealing member is crushed and the gap between the pedestal member and the ceiling or the like is filled, and the gap between the pedestal member and the ceiling or the like is filled. It has the effect of preventing the movement of air.

On the other hand, when the cover member is attached to the pedestal member, at least a part of the cover member is made transparent or translucent, so that even if the packing member between the cover member and the pedestal member is twisted or protrudes, it is external. It can be easily confirmed from. Therefore, the packing member can be reattached, and the possibility of indoor air leaking after the cover member is attached can be reduced.

Further, by fitting the packing member between the pedestal member side groove portion provided on the outer surface of the side wall portion of the pedestal member and the cover member side groove portion provided on the inner surface of the side wall portion of the cover member, the cover member becomes a packing member. It is locked to the pedestal member via. This makes it possible to maintain the airtightness inside and outside the cover member and at the same time hold the cover member at low cost without requiring additional parts for locking or a complicated structure.

On the other hand, in the statutory visual inspection after installing the fire extinguishing equipment, by making at least a part of the cover member transparent or translucent, the cover member is checked for defects such as clogging of the fire extinguishing agent discharge head inside the cover member. It is possible to visually check and find the transparent cover member without removing it.

More specifically, by making at least a part of the cover member transparent or translucent, the state of the fire extinguishing agent discharge head can be visually confirmed by seeing through the transparent or translucent portion. As a result, it is possible to easily visually check whether the fire extinguishing agent discharging head has any abnormality such as clogging or leakage of the fire extinguishing agent from a distance, so that 100% inspection of the fire extinguishing equipment such as the fire extinguishing agent discharging head can be carried out promptly and appropriately.

In addition, since it is possible to visually inspect and confirm the appearance through the cover body, it is not necessary to bother to install scaffolding even in the inspection in a place where the ceiling is high, and the time and cost required for the fire extinguishing equipment inspection can be significantly reduced.

More specifically, the packing member is arranged in a space formed by the cover member side groove portion and the pedestal member side groove portion which are arranged to face each other in a state of being crushed by the bottom surfaces of both groove portions. Therefore, the crushed packing member keeps the air inside and outside the cover member airtight, and at the same time, even if a force is applied in the direction in which the cover member separates from the pedestal member due to vibration or the like, the wall portion on the opening side of the groove portion on the cover member side Is locked to the packing member, and the packing member is locked to the wall portion on the opening side of the groove portion on the pedestal member side. As a result, the effect of preventing the cover member from coming off is generated, and the cover member can be held without being easily detached. On the contrary, even when a force is applied in the direction of pressing the cover member against the ceiling or the like, the wall portion on the opposite side of the opening side of the cover member gutter is locked to the packing member, and the packing member is a pedestal member. Since the cover member is locked to the wall portion on the bottom surface side of the gutter portion, the cover member can be held in the correct position without being pushed too much and the packing member being displaced.

In this way, in the cover member and the pedestal member, the sealing mechanism and the locking mechanism of the cover member can be simultaneously configured by the cutting process for forming the groove portion, so that the cover member can be formed only by a simple processing method such as cutting or bonding. And the pedestal member can be manufactured. Therefore, not only does it require no additional parts for locking, but it also requires almost no initial investment for injection molding dies, etc., which is required when forming complicated shapes such as locking claws, and the manufacturing cost is low. Can be suppressed to.

On the other hand, in the event of an abnormality such as a fire, a strong force is applied in the direction in which the cover member is separated from the pedestal member due to the release pressure of the fire extinguishing agent. Therefore, the side wall of the cover member and the packing member are elastically deformed from each other, and as a result of the packing member riding on the groove on the side of the cover member, the cover member separates from the pedestal member and falls, and the fire extinguishing agent is discharged toward the fire source. be able to.

Further, the depth of the cover member side groove portion and the pedestal member side groove portion requires a predetermined depth in order to obtain an appropriate crushing amount of the packing member, but the deeper the depth, the more the cover member side groove portion and the pedestal member side groove portion and the wall portion. The engagement with the packing member becomes large, and the cover member may not be able to be detached due to the discharge pressure of the fire extinguishing agent. Therefore, by forming a chamfer or a corner R on at least one of the protruding corner on the opening side of the cover member side gutter or the open corner on the pedestal member side groove, an appropriate crushing amount of the packing member is ensured. At the same time, it is possible to reduce the engagement margin between the wall portion of the cover member side groove portion and the pedestal member side groove portion and the packing member, and it is possible to reliably remove the cover member in the event of an abnormality such as a fire.

Further, by making the packing member an O-ring having a circular cross section, when the cover member is detached, the O-ring rides on the cover member side groove so as to slide along the surface of the circular O-ring without corners. Even if the O-ring is strongly crushed to ensure a secure seal, the cover member can be reliably detached by the release pressure of the fire extinguishing agent.

In addition, by separating the cover member from the pedestal member when the extinguishing agent pressure emitted from the extinguishing agent discharging head exceeds 0.1 MPa, even if there is some variation in the extinguishing agent discharging pressure. While the cover member can be reliably detached, it is also possible to prevent the cover member from falling due to an earthquake or environmental vibration in normal times.

It is a front view and the plan view which represent the sealing cover body for a fire extinguishing agent discharge head of an Example of this invention. It is a front view and sectional drawing which shows the pedestal member of an Example of this invention. It is a front view and sectional drawing which shows the cover member of the Example of this invention. It is a front view and sectional drawing which shows the packing member of an Example of this invention. It is explanatory drawing which shows the state of detachment of the cover member of an Example of this invention.

Examples of the present invention will be described with reference to FIGS. 1 to 5. The present invention is not limited to the aspects shown in these drawings.

As shown in FIG. 1, the sealing cover body 1 for the fire extinguishing agent discharge head in the present embodiment is between the pedestal member 2, the cover member 3 attached to the pedestal member 2, and the cover member 3 and the pedestal member 2. It is composed of a packing member 4 disposed in the above.

In the sealed cover body 1 for the fire extinguishing agent discharge head, when the fire extinguishing agent discharging head 5 (so-called foam head) for a known foam fire extinguishing equipment is attached to the ceiling 6, the pedestal member 2 is attached to the fire extinguishing agent discharging head 5 and the ceiling 6. By attaching the cover member 3 so as to be sandwiched and locking the cover member 3 to the pedestal member 2, the fire extinguishing agent discharge head 5 is in a state of being covered by the pedestal member 2 and the cover member 3 (see FIG. 5 (a)). ). Details will be described later.

Further, since the sealed cover body 1 for the fire extinguishing agent discharge head in this embodiment has an axisymmetric cylindrical shape as a whole and has no directionality, it should be attached without worrying about the orientation when installing it on a ceiling or the like. Is possible. Therefore, it is not necessary to align the orientation at the time of installation, and the installation man-hours can be reduced.

The sealing cover 1 for the fire extinguishing agent discharge head is used, for example, when the fire extinguishing agent discharging head 5 is attached to the ceiling of a clean room, and prevents the indoor air of the clean room from leaking through the fire extinguishing agent discharging head 5 and also causes a fire. In the event of an abnormality such as, the cover member 3 can be detached by the release pressure of the fire extinguishing agent 52 so as not to prevent the fire extinguishing agent from being released to the fire source.

As shown in FIG. 2, the pedestal member 2 in this embodiment has a bottomed cylindrical shape having a bottom surface portion 21 at one end, and in this embodiment, polyvinyl chloride, which is easy to process and inexpensive, is used as a material. .. As the material, various materials such as other resins and metals can be used as long as they have good workability and are inexpensive, but nonflammable materials are more preferable.

The size of the pedestal member 2 needs to be large enough to contain the fire extinguishing agent discharge head 5 in the cylinder, but if it is too large, the weight of the cover body 1 for fire extinguishing equipment becomes heavy and the appearance is also good. Since it is conspicuous, it is preferable to make it one size larger than the fire extinguishing agent discharge head 5. In this embodiment, the outer diameter is about φ85 mm and the height is about 40 mm.

Further, a hole portion 22 having a predetermined size is formed in the center of the bottom surface portion 21. Since the hole 22 is intended to allow the shaft 51 of the fire extinguishing agent discharge head 5 to pass through, the diameter of the hole 22 needs to be a size corresponding to the diameter of the shaft 51. In this embodiment, it is set to about φ27 mm.

Further, a sealing member 23 is arranged on the surface of the bottom surface portion 21 on the side in contact with the ceiling 6. The sealing member 23 is sandwiched between the bottom surface portion 21 and the ceiling 6 when the pedestal member 2 is attached to the ceiling 6, fills the gap, and has a role of preventing indoor air from leaking to the ceiling. Therefore, the sealing member 23 must be made of a non-breathable material, and although rubber is used in this embodiment, closed-cell urethane foam or the like can also be used.

Further, since the sealing member 23 needs to be arranged so as to surround the hole formed in the ceiling 6, in this embodiment, a rubber plate material punched out into a hollow disk shape is concentric with the hole portion 22. It is attached to the bottom surface 21 with double-sided tape.

On the other hand, on the outer peripheral side of the side wall portion 24 of the pedestal member 2, a pedestal member side groove portion 25 is provided over the circumferential direction. The pedestal member side groove portion 25 is a groove for attaching the packing member 4, and the depth of the groove can be appropriately adjusted by the required detaching force of the cover member 3. In the present embodiment, the pedestal member side groove portion 25 is formed at a position closer to the opening side of the side wall portion 24 of the pedestal member 2, but may be formed at a position closer to the bottom surface portion 21.

The cross-sectional shape of the pedestal member side groove portion 25 in this embodiment adopts a U-shape in which the wall portion of the pedestal member side groove portion 25 is perpendicular to the bottom surface portion, but the wall portion is relative to the bottom surface portion. It may have an acute angle (the width of the opening is narrower than the width of the bottom surface) or the wall portion may be an obtuse angle with respect to the bottom surface portion (the width of the opening portion is wider than the width of the bottom surface portion).

As shown in FIG. 3, the cover member 3 in this embodiment has a bottomed cylindrical shape like the pedestal member 2, and has a transparent or translucent structure in which the inside can be visually recognized. In this embodiment, a transparent and inexpensive polymethylmethacrylate resin is used as the material, but other materials may be used as long as the inside can be visually recognized, but the pedestal member is affected by the release pressure of the fire extinguishing agent 52. In order to separate from 2, it is necessary to use a material having moderate elasticity. Regarding the color of the material, only a part (for example, only the bottom surface portion) may be transparent or translucent.

In this way, by making at least a part of the cover member 3 transparent or translucent so that the inside can be visually recognized, the fire extinguishing agent discharge head 5 inside the cover member 3 is clogged in the legal appearance inspection after the installation of the fire extinguishing equipment. Further, it is possible to find out whether or not there is a problem such as the fire extinguishing agent 52 leaking into the cover member 3 without removing the cover member 3. Further, even if the packing member 4 is twisted or protrudes when the cover member 3 is attached, it can be easily confirmed from the outside. Therefore, the packing member 4 is immediately reattached to prevent the occurrence of air leakage. can do.

In the cover member 3, the inner peripheral side of the side wall portion 31 of the cover member 3 is fitted to the outer peripheral side of the side wall portion 24 of the pedestal member 2, so that the diameter of the side wall portion 31 of the cover member 3 is the diameter of the pedestal member 2. It is necessary to make it slightly larger than the diameter of the side wall portion 24 of the above, and in this embodiment, the inner diameter is about φ88 mm and the height is about 80 mm.

Further, on the inner peripheral side of the side wall portion 31 of the cover member 3, a cover member side groove portion 32 is provided over the circumferential direction. The cover member side groove portion 32 is a groove for fitting the packing member 4 attached to the pedestal side groove portion 25, and the depth of the groove is determined by the required release force of the cover member 3 as in the pedestal side groove portion 25. It can be adjusted as appropriate.

The cover member side groove portion 32 needs to be formed so as to face the pedestal member side groove portion 25 in a state where the cover member 3 is covered with the pedestal member 2. Therefore, the packing member 4 is arranged in the space formed by the cover member side groove portion 32 and the pedestal member side groove portion 25 which are arranged so as to face each other.

Further, the cross-sectional shape of the cover member side groove portion 32 in this embodiment adopts a U-shape in which the wall portion of the cover member side groove portion 32 is perpendicular to the bottom surface portion, but is the same as the pedestal member side groove portion 25. , The wall is sharp with respect to the bottom (the width of the opening is narrower than the width of the bottom), and the wall is obtuse with respect to the bottom (the width of the opening is wider than the width of the bottom). There may be.

Further, a chamfer of a predetermined size is formed in the protruding corner portion 33 on the opening side of the cover member side groove portion 32. If the depth of the cover member side groove portion 32 and the pedestal member side groove portion 25 is too shallow, the amount of crushing of the packing member 4 becomes too large, the friction becomes strong, and the cover member 3 can be detached by the release pressure of the fire extinguishing agent 52. It disappears. On the contrary, if it is too deep, the friction becomes weak, but the engagement between the wall portion of the cover member side groove portion 32 and the pedestal member side groove portion 25 and the packing member 4 becomes large, and similarly, the cover member 3 is affected by the discharge pressure of the fire extinguishing agent 52. You will not be able to leave.

Therefore, the depth of the cover member side groove portion 32 and the pedestal member side groove portion 25 is deepened to some extent so that the minimum amount of crushing of the packing member 4 required for sealing is achieved, and at the same time, the protruding corner of the cover member side groove portion 32 on the opening side. By forming a chamfer on the portion 33, it is possible to reduce the engagement margin between the wall portion of the cover member side groove portion 32 and the pedestal member side groove portion 25 and the packing member 4, and the cover member can be reliably reduced in the event of an abnormality such as a fire. It is possible to separate 3 from. The chamfer of the protruding corner portion 33 may be an angle R.

As shown in FIG. 4, the packing member 4 in this embodiment uses an O-ring having a circular cross section. In this embodiment, an O-ring made of natural rubber is used, but in addition to this, O-rings made of various materials such as EPDM and silicone can be used.

Here, the packing member 4 may have various cross-sectional shapes, but in this embodiment, an O-ring having a circular cross section is used. As a result, when the cover member 3 is detached, the O-ring rides on and comes off from the cover gutter 32 by sliding on the surface of the circular O-ring without corners, so that the O-ring is crushed to ensure a secure seal. However, the cover member 3 can be reliably detached by the release pressure of the fire extinguishing agent 52. In this embodiment, an O-ring having a cross-sectional diameter of about φ3.1 mm and an inner diameter of about φ119.4 mm is used.

Next, the mechanism of detachment of the cover member 3 in this embodiment will be described with reference to FIGS. 5 (a) and 5 (b). FIG. 5A shows a state in which the sealing cover body 1 for the fire extinguishing agent discharge head is attached to the ceiling 6 in a state where the fire extinguishing agent discharge head 5 is covered. Since this figure is axisymmetric, it is a cross-sectional view in which half is omitted.

When attaching the fire extinguishing agent discharge head 5 to the ceiling 6, first, the packing member 4 and the sealing member 23 are attached to the pedestal member 2 in advance, and the shaft portion 51 of the fire extinguishing agent discharge head 5 is attached to the hole portion 22 of the pedestal member 2. Is inserted from the cylindrical portion side of the pedestal member 2. Then, the shaft portion 51 is inserted into the hole formed in the ceiling 6, the shaft portion 51 is fixed by the joint 7 behind the ceiling, and is connected to an empty pipe (not shown). As a result, the pedestal member 2 is fixed in a state of being sandwiched between the fire extinguishing agent discharge head 5 and the ceiling 6.

Next, the cover member 3 is covered with the pedestal member 2 from the opening side. Here, in order to prevent the packing member 4 from riding on the pedestal member side groove portion 25 and coming off when the cover member 3 is pushed in, it is preferable to cover the pedestal member 2 while rotating the cover member 3. If necessary, a lubricant such as grease may be applied to the O-ring, but care must be taken so that the detaching force of the cover member 3 does not deviate from a predetermined range.

Here, since the cover member 3 is made of a transparent polymethylmethacrylate resin as a whole, the packing member 4 may be twisted when the cover member 3 is attached, or the cover member 4 may be disengaged from the pedestal member gutter portion 25. Even if the cover member 3 is attached, it can be visually recognized from the outside and the packing member 4 can be reattached, so that the possibility of indoor air leaking after the cover member 3 is attached can be reduced.

In the cover body 1 for fire extinguishing equipment attached in this way, as shown in FIG. 5A, the gap between the pedestal member 2 and the ceiling 6 is formed by the sealing member 23, and the cover member 3 and the pedestal member 2 The gap between the two can be set to a state in which the indoor air and the outside air are blocked by the packing member 4.

In the state where the sealing cover body 1 for the fire extinguishing agent discharge head is attached, the fire extinguishing agent 52 is not discharged from the fire extinguishing liquid discharge head 5 in normal times, but the cover member 3 is caused by the weight of the cover member 3 or environmental vibration. May try to shift to the floor side. Even in this case, since the packing member 4 is arranged in the space formed by the cover member side groove portion 32 and the pedestal member side groove portion 25 arranged to face each other, friction between the packing member 4 and both groove portions is provided. Along with the application of force, the wall portion on the opening side of the cover member side gutter portion 32 is locked to the packing member 4, and the packing member 4 is locked to the wall portion on the opening side of the pedestal member side groove portion 25. Therefore, the cover member 3 can be held without being easily detached by simultaneously performing the sealing and retaining functions of the packing member 4 without requiring other additional parts or the like.

On the other hand, in the event of an abnormality such as a fire, the fire extinguishing agent 52 is discharged from the fire extinguishing liquid discharge head 5 as shown in FIG. 5 (b). At this time, since the fire extinguishing agent discharge head 5 is covered with the cover member 3, the released fire extinguishing agent 52 is temporarily stored inside the cover member 3. However, at the same time, due to the release pressure of the fire extinguishing agent 52, a large force is applied to the cover member 3 so as to shift toward the floor surface side.

At this time, the protruding corner portion 33 on the opening side of the cover member side groove portion 32 slides along the surface of the packing member 4, so that the side wall portion 31 of the cover member 3 is elastically deformed so as to be slightly opened, and at the same time, the packing. The member 4 is elastically deformed so as to be greatly crushed. As a result, the protruding corner 33 on the opening side of the cover member gutter 32 is more likely to slide along the surface of the packing member 4, so that the packing member 4 finally rides on the cover gutter 32 and comes off to cover the cover. The member 3 separates from the base member 2 and falls, and the fire extinguishing agent 52 is discharged toward the fire source.

In this embodiment, a chamfer is formed at the protruding corner 33 on the opening side of the cover member gutter 32, but when there is no chamfer, the depth of the cover member gutter 32 and the pedestal member gutter 25 is deepened. Then, the engagement margin between the wall portion of the cover member side groove portion 32 and the pedestal member side groove portion 25 and the packing member 4 becomes too large, and the cover member side groove portion 32 and the pedestal member side groove portion 25 are separated when the predetermined release pressure (0.1 MPa in this embodiment) is exceeded. You will not be able to do it. However, if the depths of the cover member side groove portion 32 and the pedestal member side groove portion 25 are made shallow in order to reduce the engagement margin, the amount of crushing of the packing member 4 becomes too large, and the frictional force between the packing member 4 and both groove portions becomes too large. There is a possibility that it will not be able to be released when the predetermined release pressure is exceeded.

Therefore, in order to achieve both an appropriate engagement between the wall portion of the cover member side groove portion 32 and the pedestal member side groove portion 25 and the packing member 4, and an appropriate crushing amount of the packing member 4, the cover member side groove portion 32 and the pedestal member side groove A predetermined depth of the portion 25 is secured, and a chamfer is provided at the protruding corner portion 33 on the opening side of the cover member side groove portion 32. A chamfer may be formed on the protruding corner 26 on the opening side of the pedestal member side groove portion 25, but the chamfering side may be formed on the protruding corner portion 33 on the opening side of the cover member side groove portion 32 or the opening side of the pedestal member side groove portion 25. It is preferable that a chamfer is formed on at least one of the protruding corners 26.

When a chamfer is formed on the open corner 26 of the pedestal member gutter 25, the open corner 26 of the pedestal gutter 25 slides along the surface of the packing member 4. As a result, the side wall portion 31 of the cover member 3 is elastically deformed so as to be slightly opened, and at the same time, the packing member 4 is elastically deformed so as to be greatly crushed. As a result, the protruding corner portion 26 on the opening side of the pedestal member side groove portion 25 is more likely to slide along the surface of the packing member 4, so that the packing member 4 finally rides on the pedestal member side groove portion 25 and comes off. The cover member 3 with the packing member 4 attached is separated from the base member 2 and falls, and the fire extinguishing agent 52 is discharged toward the fire source.

On the other hand, as another form, the inner diameter of the side wall portion 31 on the opening side may be formed larger than the inner diameter of the side wall portion 31 on the bottom surface side with the cover member side groove portion 32 as a boundary (not shown).

In this way, the depth of the cover member side groove portion 32 is sufficiently deepened to secure the minimum amount of crushing of the packing member 4 required for sealing, and at the same time, the inner diameter of the side wall portion 31 on the opening side is increased. , It is possible to reduce the engagement margin between the wall portion of the cover member side groove portion 32 and the packing member 4. This makes it possible to reliably remove the cover member 3 with a predetermined release pressure in the event of an abnormality such as a fire.

Further, even when the cover member 3 is covered with the pedestal member 2 from the opening side, since the inner diameter of the side wall portion 31 on the opening side is large, the amount of crushing of the packing member 4 can be small, so that the cover member 3 is covered with a light force. be able to.

Although the present invention is generally configured as described above, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of "Claims", for example. The packing member may have an elliptical cross section or an irregular cross section.

Further, the pedestal member and the cover member may have a rectangular or elliptical tubular shape instead of a cylindrical shape, and both belong to the technical scope of the present invention.

1 Sealed cover for fire extinguishing agent discharge head 2 Pedestal member
21 Bottom part
22 Hole
23 Sealing member
24 Side wall of pedestal member
25 Pedestal member gutter
26 Outer corner on the opening side of the pedestal member gutter 3 Cover member
31 Side wall of cover member
32 Cover member gutter
33 Outer corner on the opening side of the cover member gutter 4 Packing member 5 Fire extinguishing agent discharge head
51 Shaft
52 Fire extinguishing agent 6 Ceiling 7 Fittings

Claims (4)

A sealed cover for the fire extinguishing agent release head to keep the room airtight.
A pedestal member that is sandwiched and fixed to the ceiling or wall surface by the fire extinguishing agent discharge head, and
A cover member that is locked to the pedestal member and is at least partially transparent or translucent.
While composed of a packing member fitted between the pedestal member and the cover member,
The pedestal member has a bottomed tubular shape having a bottom surface at one end on the side attached to the ceiling or wall surface, and the bottom surface has a hole corresponding to the diameter of the shaft portion of the fire extinguishing agent discharge head. A sealing member made of a non-breathable material is arranged on the surface of the bottom surface in contact with the ceiling or the wall surface.
The cover member is provided with a cover member side groove into which the packing member can be fitted on the inner surface of the side wall, while the pedestal member has a pedestal member side groove at a position facing the cover member side groove on the outer surface of the side wall. By providing the portion, the packing member is fitted between the pedestal member side groove portion and the cover member side groove portion, and the packing member is fitted.
The cover member is a sealed cover body for a fire extinguishing agent discharge head, which can be locked to a pedestal member via a packing member. The first aspect of the present invention, wherein a chamfer or an angle R is formed on at least one of the protruding corner portion on the opening side of the cover member side groove portion or the protruding corner portion on the opening side of the pedestal member side groove portion. Sealed cover for fire extinguishing agent release head. The sealed cover body for a fire extinguishing agent discharge head according to claim 1 or 2, wherein the packing member is an O-ring having a circular cross section. The sealed cover body for a fire extinguishing agent discharge head according to claim 1 to 3, wherein the cover member is separated from the pedestal member when the pressure of the fire extinguishing agent discharged from the fire extinguishing agent discharging head exceeds 0.1 MPa.

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