JP6762859B2 - Differential pressure damper - Google Patents

Description

The present invention relates to a differential pressure damper that is attached to an opening formed in a partitioning means for partitioning a space in a building and has a function of opening when a preset pressure difference is reached.

Conventionally, as a means of directly pressurizing and supplying air to an annex in a building, an emergency elevator annex, an annex provided adjacent to a staircase, or a staircase without an annex, an annex or a staircase The other areas were partitioned by fire doors, and differential pressure dampers for adjusting the pressure in the pressurized room were provided on the walls of the annex and the fire doors themselves. The specifications of the differential pressure damper are stipulated in the Building Standards Act (Showa 44 Declaration No. 1728), and when the fire door is closed under pressure in the attached room, the fire door can be opened with a force of 100 N or less. It is required to be.

It is conceivable that the differential pressure damper is installed on the wall that separates the annex room (or staircase room) from the adjacent room, but from the viewpoint of ensuring workability and corridor width, it is directly attached to the fire door (fire door). A method of providing a differential pressure damper is disclosed (see, for example, Patent Documents 1, 2 and 3).

The "damper device" described in Patent Document 1 includes an opening / closing blade provided in the ventilation port rotatably to open / close the ventilation port through which wind flows, and a guide rod fixed to the opening / closing blade at a required mounting angle. The guide rod is provided so as to rotate in an arc shape while shifting from one side of the horizontal direction line to the other side beyond the horizontal direction line as the opening / closing blade is opened and closed. The guide rod is provided with a free slide weight so that the guide rod can freely slide along the guide rod as the arc rotates.

The "fire door" described in Patent Document 2 is provided in the evacuation passage of a building so as to be openable and closable, and one end of the fire door that closes the evacuation passage in the event of a fire is rotatably supported on the wall side of the evacuation passage. It has a first fire door and a second fire door rotatably connected to the other end of the first fire door, and a differential pressure damper is incorporated in the second fire door. It has been.

The "differential pressure damper for pressurized smoke prevention" described in Patent Document 3 is provided at the opening of a partition member that separates a pressurized region that is pressurized to a positive pressure state from a non-pressurized region in the event of a fire. It is a differential pressure damper for pressurized smoke prevention, and the blades are rotatably provided around the support shaft, and when the blades are in the non-rotating position, the opening is closed and the pressurized region and the non-pressurized region are separated. It has a function to open at least a part of the opening when the blade is rotated by mutual differential pressure, and a moment for rotating the blade toward a non-rotating position is constantly applied to the blade, and the blade is It is formed so that the moment decreases as the rotation angle of the above increases.

Japanese Unexamined Patent Publication No. 06-241551 Japanese Unexamined Patent Publication No. 2003-120141 Japanese Unexamined Patent Publication No. 2009-008358

The normally open type fire doors as described in Patent Documents 1 and 2 are usually stored in the wall, and the thickness of the damper is particularly problematic with respect to the thickness of the fire door due to the nature of being used only in an emergency. It never became. However, considering how to secure the storage space of the damper device (differential pressure damper) when the fire door is stored in the wall, or considering the transportability and carry-in ease of the damper, the damper device (difference). The pressure damper) is preferably compact.

Also, even in a normally closed type fire door, if the thickness of the damper device (differential pressure damper) becomes larger than the thickness of the fire door, various problems will occur. Therefore, as in the case of the normally open type fire door, the damper device There is a demand for compactness of (differential pressure damper).

On the other hand, the differential pressure damper for pressure smoke prevention described in Patent Document 3 is attached to a substantially front rectangular opening formed in the staircase door. This differential pressure damper includes a front-shaped frame that substantially matches the opening of the stair door, and a plurality of damper units that are arranged side by side at substantially equal intervals in the vertical direction inside the frame. .. Further, each damper unit includes a support shaft, blades, and a connecting portion, and the blades are rotatably connected to one support shaft via the connecting portion.

As described above, the differential pressure damper described in Patent Document 3 has a structure in which a plurality of blades are housed in one frame. Therefore, if the processing air volume required at the construction site is different, the blades It is necessary to prepare multiple differential pressure dampers with different numbers of sheets (the size of the frame is also different).

Further, when a plurality of blades (damper units) are housed in one frame, the frame is distorted when attached to the opening of the stair door because the thickness is smaller than the vertical and horizontal sizes thereof. After installation, it is necessary to check whether it works properly, and if a malfunction is found during the check work, adjust each part until it works properly. Work is required.

Therefore, the problem to be solved by the present invention is that the transportability to the installation location and the workability are good, the operation is reliably performed by the pressurization of the pressurizing chamber on the upstream side, and it is not necessary to separately prepare for each processing air volume. , To provide a differential pressure damper.

The differential pressure damper of the present invention is a differential pressure damper that is attached to an opening formed in a partitioning means for partitioning a space in a building and opens when a preset pressure difference is reached.
A damper unit having a frame body and a single blade rotatably attached to the frame body via a shaft body to open and close the area surrounded by the frame body.
It is characterized by comprising a fixing means for attaching a plurality of the damper units arranged in parallel in the opening formed in the partition means to the partition means.

In the differential pressure damper of the present invention, a plurality of damper units having one blade in one frame-like body are arranged in the opening of the partition means, so that the transportability and workability to the installation location can be improved. It will be good. Further, as compared with the conventional differential pressure damper having a plurality of blades in one frame, malfunction due to distortion of the frame is less likely to occur. For example, when a fire breaks out in a building, the upstream side is added. It operates reliably by pressurizing the pressure chamber. Furthermore, by changing the number of damper units arranged, it is possible to correspond to the processing air volume at the installation location, so it is not necessary to create differential pressure dampers for each processing air volume, and the size of the damper unit is standardized. can do.

Here, in the differential pressure damper, it is desirable that the thickness of the damper unit when the blades of the damper unit are in the closed state is equal to or less than the thickness of the partition means.

With such a configuration, when the blades are closed, the components such as the blades that make up the damper unit do not protrude from both the front and back sides of the partition means (fire door, fire door, etc.), so other work is done. The impact on the vehicle can be minimized and the versatility is increased.

Further, in the differential pressure damper, as the fixing means, a ridge-shaped mounting portion having a through hole in at least a part of the outer periphery of the frame body and a bolt screwed to the partition means through the through hole. And can be provided.

With such a configuration, a plurality of damper units can be easily fixed to the opening of the partition means by using a bolt which is a general-purpose member. Moreover, although it has a simple structure, it can be securely fixed.

Further, in the differential pressure damper, the upper edge portion and the lower edge portion are directed from the downstream side to the upstream side, respectively, on the upper edge portion side and the lower edge portion side of the blade when the blade is in the closed state. It is desirable to have an inclined bending portion. The upstream side and the downstream side are pressurized in a pressurizing chamber or the like partitioned by the partitioning means, and the flow direction of the air flow passing through the differential pressure damper is used as a reference.

With such a configuration, when the blades are in the open state, lift is generated by the air flow in the blades themselves, so that it is easy to maintain the balance of the blades in the open state. Further, since the closing force is applied when the blades are in the closed state, a reliable closed state can be obtained.

Further, in the differential pressure damper, a portion of the inner peripheral surface of the frame body of the damper unit facing the lower edge portion of the blade in a closed state and at a position upstream of the lower edge portion of the blade. A guide member having a guide surface that forms an ascending slope toward the downstream side can be provided. The upstream side and the downstream side are pressurized in a pressurizing chamber or the like partitioned by the partitioning means, and the flow direction of the air flow passing through the differential pressure damper is used as a reference.

With such a configuration, the air flow pressurized in the pressurizing chamber on the upstream side abuts on the guiding surface of the guiding member and is guided to the blade surface, so that the blade opening operation is smoothly performed. ..

Further, in the differential pressure damper, a double bearing arranged coaxially with the shaft body is provided between the frame body and the shaft body.
The double bearing includes an inner peripheral bearing made of polytetrafluoroethylene-coated metal arranged on the outer periphery of the shaft body and an outer peripheral bearing made of polytetrafluoroethylene arranged around the inner peripheral bearing. It can be a bearing.

With such a configuration, the slidability of the shaft body with respect to the frame body is enhanced, so that the opening and closing operation of the blades is facilitated. In addition, the corrosion resistance of the double bearing is also good.

Further, in the differential pressure damper, on the inner side surface of the frame body facing the side edge portion of the blade, a position above the shaft body and downstream from the upper edge portion of the blade, and the shaft. At a position below the body and upstream of the lower edge of the blade,
A closing member that hides the gap between the inner surface of the frame and the side edge of the blade can be provided.

With such a configuration, in the event of a fire, if the air flow pressurized in the pressurizing chamber on the upstream side stops for some reason and the blades are closed, the inner surface of the frame and the blades It is possible to prevent flames and smoke from leaking from the gap (clearance) with the side edge portion.

Further, the differential pressure damper may be provided with a fixing bolt projecting from a bent portion on the upper edge side of the blade and a weight attached to the fixing bolt.

With such a configuration, the pressure difference (set pressure) required for the blades to open can be adjusted by changing the position of the weight with respect to the fixing bolt and the number of weights attached to the fixing bolt.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a differential pressure damper which has good transportability and workability to an installation location, operates reliably by pressurization of a pressurizing chamber on the upstream side, and does not need to be separately manufactured for each processing air volume. be able to.

It is a partially omitted horizontal sectional view which shows the fire door to which the differential pressure damper which is the embodiment of this invention is attached, and the vicinity thereof. It is a front view of the fire door seen from the arrow A direction in FIG. 1 when the blade of a differential pressure damper is in a closed state. It is a rear view of the fire door seen from the arrow line B direction in FIG. FIG. 5 is a cross-sectional view taken along the line CC in FIG. It is a perspective view which saw one of the plurality of damper units constituting the differential pressure damper shown in FIG. 2 from the front side. FIG. 5 is a perspective view of the damper unit shown in FIG. 5 as viewed from the rear side. It is a side view of the damper unit seen from the arrow D direction in FIG. FIG. 5 is a cross-sectional view taken along the line EE in FIG. FIG. 5 is a partially omitted cross-sectional view taken along the line FF in FIG. It is a front view of the fire door when the blade of a differential pressure damper is in an open state. It is a top view of the fire door shown in FIG. FIG. 5 is a cross-sectional view taken along the line GG in FIG. It is a perspective view which saw one of the plurality of damper units constituting the differential pressure damper shown in FIG. 10 from the front side. FIG. 3 is a perspective view of the damper unit shown in FIG. 13 as viewed from the rear side. It is a side view of the damper unit seen from the arrow J direction in FIG. It is sectional drawing in the KK line in FIG. It is a partially omitted vertical sectional view which shows the other embodiment about the fire door to which the differential pressure damper is attached.

Hereinafter, the differential pressure damper 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 16. As shown in FIGS. 1 to 3, the differential pressure damper 100 of the present embodiment is attached to an opening 11 formed in a fire door 10 which is a partitioning means for partitioning a space in a building. In normal times, it is in a closed state as shown in FIGS. 2 to 4, and when a preset pressure difference is reached in the event of a fire or the like, it is opened as shown in FIGS. 10 to 12 described later.

As shown in FIG. 1, the pair of fire doors 10 and 10 are attached to the wall bodies 12 and 12 arranged to face each other so as to be openable and closable via a hinge 13, and the differential pressure damper 100 is attached to one of the fire doors 10. There is. In normal times, the fire doors 10 and 10 are housed in the recesses 12a and 12a provided in the wall bodies 12 and 12, respectively. When a fire breaks out, the fire doors 10 and 10 rotate 90 degrees in the direction of the arrow 14 around the hinges 13 and 13, respectively, and are closed. As a result, the space between the walls 12 and 12 is divided into the annex 15 and the adjacent chamber 16 by the fire doors 10 and 10.

After that, when air is supplied into the annex 15 by a predetermined air supply means (for example, a blower), the pressure in the annex 15 increases, and a preset pressure difference is reached, the differential pressure damper 100 is opened. As shown by the arrow 17 in FIG. 1, the air in the annex 15 passes through the differential pressure damper 100 and is sent into the adjacent chamber 16. As a result, the pressure in the annex 15 is maintained higher than the pressure in the adjacent chamber 16, so that it is possible to prevent smoke, gas, etc. from entering the annex 15 from the adjacent chamber 16.

Here, the structure and function of the differential pressure damper 100 will be described with reference to FIGS. 2 to 9. In FIG. 2, the direction indicated by the arrow H is referred to as the horizontal direction (or the horizontal direction), and the direction indicated by the arrow V is referred to as the vertical direction (or the vertical direction). As shown in FIGS. 2 and 3, the differential pressure dampers 100 are arranged in parallel with a plurality of (4 units) damper units 20A, 20B, 20B, 20C in the opening 11 formed in the fire door 10. The plurality of damper units 20A, 20B, 20B, and 20C are provided with a ridge-shaped attachment portion 21, 22, 23, which is a fixing means for attaching the plurality of damper units 20A, 20B, 20B, and 20C to the fire door 10, and a plurality of bolts 24.

As shown in FIG. 3, the damper unit 20A has a pair of mounting portions 22 and 22 projecting to the left and right of the frame body 25, and mounting portions 21 projecting above the frame body 25. .. The damper unit 20B has a pair of mounting portions 22, 22 protruding from the left and right. The damper unit 20C has a pair of mounting portions 22 and 22 projecting to the left and right, and a mounting portion 23 projecting downward.

The plurality of damper units 20A, 20B, 20B, and 20C are arranged vertically in parallel with each other in the opening 11 of the fire door 10 with the axial directions of the respective shaft bodies 26 described later being horizontal. It is arranged in. The damper units 20A, 20B, 20B, and 20C are fixed by screwing a plurality of bolts 24 to the back side of the fire door 10, but the damper units 20A, 20B, 20B, and 20C are not restrained from each other. Therefore, the damper units 20A, 20B, 20B, and 20C can be individually attached to and detached from the opening 11 of the fire door 10.

As shown in FIG. 4, the thickness 20t of the damper units 20A, 20B, 20B, 20C when the blades 27 of the damper units 20A, 20B, 20B, 20C are in the closed state is 10t or less of the thickness of the fire door 10.

Since the damper units 20A and 20C and the damper unit 20B have the same structure and function as each other except for the presence or absence of the mounting portions 21 and 23, the structure and function of the damper unit 20B will be described below.

As shown in FIGS. 5 to 8, the damper unit 20B has a frame body 25 having a rectangular front view shape and two left and right shafts arranged in the horizontal direction for opening and closing the area surrounded by the frame body 25. It includes a single blade 27 that is rotatably attached to the frame body 25 via the body 26. The quadrangular frame body 25 is arranged in the opening 11 (see FIG. 2) of the fire door 10 so that the long side portion 25a forms the horizontal direction and the short side portion 25b forms the vertical direction. ..

Ribbed mounting portions 22 and 22 project from the short side portions 25b and 25b of the frame body 25 in the left-right direction, respectively. Through holes 28 and 28 for inserting the bolts 24 are provided above and below the mounting portions 22 and 22, respectively.

As shown in FIG. 7, the back surface 22a of the mounting portion 22 is provided at a position closer to the front surface by a predetermined dimension S from the back surface 25e of the frame body 25. Further, the back surface 21a of the mounting portion 21 projecting above the frame body 25 of the damper unit 20A and the back surface 23a of the mounting portion 23 projecting below the frame body 25 of the damper unit 20C also shown in FIG. Similar to the mounting portion 22, the frame body 25 is provided at a position closer to the front surface by a predetermined dimension S from the back surface 25e. It is desirable that the predetermined dimension S is equal to or larger than the height of the head (not shown) of the bolt 24 shown in FIG. 3, so that the head of the bolt 24 is from the back surface of the fire door 10. It is possible to avoid protruding.

As shown in FIG. 8, on the upper edge portion 27a side and the lower edge portion 27b side of the blade 27, when the blade 27 is in the closed state, the upper edge portion 27a and the lower edge portion 27b are moved from the downstream side to the upstream side, respectively. It is provided with bending portions 27ax and 27bx inclined so as to face. Regarding the above-mentioned "downstream side" and "upstream side", the direction indicated by the arrow 17a in FIG. 8 is the "downstream side", and the direction 180 degrees opposite to the direction indicated by the arrow 17a is the "upstream side". Is.

As shown in FIG. 8, on the inner peripheral surface 25c of the frame body 25 of the damper unit 20B, the portion facing the lower edge portion 27b of the blade 27 in the closed state and upstream of the lower edge portion 27b of the blade 27. At the position, a guiding member 29 having a guiding surface 29a forming an upward slope toward the downstream side is provided.

As shown in FIG. 8, a plurality of fixing bolts 33 are projected from the bent portion 27ax on the upper edge portion 27a side of the blade 27 so as to stand upstream (back side) from the bent portion 27ax, and these are fixed. A plurality of strip-shaped weights 34 are detachably fixed to the bolts 33 by nuts 35.

As shown in FIG. 9, a double bearing 30 arranged coaxially with the shaft body 26 is arranged between the side wall portion constituting the frame body 25 and the shaft body 26. The double bearing 30 includes an inner peripheral bearing 31 made of polytetrafluoroethylene-coated metal arranged on the outer periphery of the shaft body 26, and an outer peripheral bearing 32 made of polytetrafluoroethylene arranged around the inner peripheral bearing 31. Is equipped with.

As shown in FIGS. 5, 6 and 8, on the inner side surface (inner surface of the side wall portion 25d) of the frame body 25 facing the side edge portion 27c of the blade 27, above the shaft body 26 and above the blade 27. The closing member 36 is provided at a position downstream of the edge portion 27a, and the closing member 37 is provided at a position below the shaft body 26 and upstream of the lower edge portion 27b of the blade 27. Each of the closing members 36 and 37 has a function of hiding the gap between the inner surface of the frame body 25 (inner surface of the side wall portion 25d) and the side edge portion 27c of the blade 27.

As described above, in normal times, the fire door 10 shown in FIG. 1 is housed in the recess 12a of the wall body 12, and at this time, the damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100. The blades 27 of the above are all held in the closed state as shown in FIGS. 2 to 8.

When a fire breaks out in the building, the fire doors 10 and 10 rotate 90 degrees in the direction of the arrow lines 14 around the hinges 13 and 13 to be closed, and the space between the walls 12 and 12 is the fire door 10. , 10 divides the annex 15 and the adjacent room 16.

After that, when air is supplied into the annex 15 by a predetermined air supply means (for example, a blower) and the pressure in the annex 15 increases and exceeds a preset pressure difference, it is shown in FIGS. 10 to 16. As described above, the blades 27 of the damper units 20A, 20B, 20B, and 20C constituting the differential pressure damper 100 rotate around the shaft body 26 to be in an open state (substantially horizontal state).

As a result, as shown by the arrow 17 in FIG. 1, the air in the annex 15 passes through the differential pressure damper 100 and is sent into the adjacent chamber 16, and the air pressure in the annex 15 is in the adjacent chamber 16. Since the pressure is maintained higher than the pressure, it is possible to prevent smoke, gas, etc. from entering the annex 15 from the adjacent chamber 16.

A plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100 are arranged in parallel in the vertical direction and fixed to the opening 11 of the fire door 10, but the damper units 20A, 20B, 20B are adjacent to each other in the vertical direction. Since the frame body 25 and the blades 27 of 20C are not connected to each other, it is possible to prevent the blades 27 from malfunctioning due to the distortion of the frame body 25. Further, since the blades 27 of the plurality of damper units 20A, 20B, 20B, and 20C are independent, reliable operation can be ensured. If necessary, it is possible to join the portions of the damper units 20A, 20B, 20B, and 20C that are vertically adjacent to each other with screws (not shown).

The thickness 20t of the damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100 shall be 10t or less of the thickness of the fire door 10, and when the blade 27 is in the closed state, from the front 10f or the back 10e of the fire door 10. The components such as the blades 27 and the weights 34 are configured so as not to protrude. Therefore, when the differential pressure damper 100 is in the closed state, it does not hinder people or objects passing near the fire door 10.

The mounting portions 21, 22, 23 of the damper units 20A, 20B, 20B, 20C with respect to the fire door 10 are inside the back surface (the surface facing the annex 15) of the damper units 20A, 20B, 20B, 20C, so that the dampers are When the units 20A, 20B, 20B, and 20C are fixed to the fire door 10 with the bolt 23 (see FIG. 3), it is possible to prevent the head of the bolt 23 from protruding from the back surface of the fire door 10.

Further, the outer shape of the damper units 20A, 20B, 20B, 20C has a square box shape without a protruding portion. Therefore, the damper units 20A, 20B, 20B, and 20C can be easily packed and stacked, and can be easily transported.

Of the plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100, the mounting portion 21 is provided on the upper portion of the frame body 25 of the damper unit 20A located at the uppermost portion, and the damper unit is located at the lowermost portion. A mounting portion 23 is provided at the lower part of the frame body 25 of 20C. As a result, the damper units 20A and 20C located at the uppermost part and the lowermost part can be securely fixed to the fire door 10. Further, between the frame 25 of the damper unit 20A located at the uppermost part and the opening 11 of the fire door 10, and between the frame 25 of the damper unit 20C located at the lowermost part and the opening 11 of the fire door 10. It is possible to prevent a gap from being formed between them.

The inner peripheral surface 25c of the frame body 25 of the plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100 is provided with the guiding member 29 having the guiding surface 29a, so that the pressure is applied in the annex 15. The air flow comes into contact with the guide surface 29a of the guide member 29, and the air flow is guided to the blades 27, so that the blades 27 are smoothly opened. In the present embodiment, the cross-sectional shape of the guiding member 29 (the cross-sectional shape on the plane parallel to the air flow direction) is a substantially right-angled triangular shape, and the inclination angle of the guiding surface 29a is 45 degrees with respect to the horizontal plane. It is not limited to.

Further, in the guiding member 29, the bent portion 27bx on the lower edge portion 27b side of the blade 27 when in the fully closed state comes into contact with the upright surface 29b perpendicular to the inner peripheral surface 25c of the frame body 25, thereby serving as a stopper. Function. Further, in order to prevent noise when the blades 27 in the open state are closed, a cushioning material (not shown) is provided on the upright surface 29b of the guide member 29.

In the plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100, as shown in FIG. 9, the double bearing 30 is made of a polytetrafluoroethylene-coated metal arranged on the outer periphery of the shaft body 26. The inner peripheral bearing 31 and the outer peripheral bearing 32 made of polytetrafluoroethylene arranged around the inner peripheral bearing 31 are provided.

As a result, even if the damper units 20A, 20B, 20B, 20C are heated by the flame at the time of fire and the polytetrafluoroethylene coating of the outer peripheral bearing 32 and the outer peripheral bearing 32 made of polytetrafluoroethylene is melted. Since the shaft body 26 is rotatably supported by the metal inner peripheral bearing 31, the opening / closing operation of the blade 27 can be reliably maintained.

The frame bodies 25 of the plurality of damper units 20A, 20B, 20B, and 20C constituting the differential pressure damper 100 are provided with closing members 36 and 37, respectively, whereby the inner surface of the frame body 25 (inner surface of the side wall portion 25d). The gap between the blade 27 and the side edge portion 27c of the blade 27 can be hidden. Therefore, in the event of a fire, even if the air flow pressurized in the annex 15 on the upstream side is stopped for some reason and the blades 27 are closed, the inner surface of the frame 25 (inner surface of the side wall 25d). It is possible to prevent flames and smoke from leaking from the gap (clearance) between the blade 27 and the side edge portion 27c of the blade 27. The closing member 36 above the shaft body 26 also has a function as a stopper when the blades 27 are fully opened (see FIG. 16).

In the plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100, a strip-shaped (flat bar type) weight 34 is attached to the fixing bolt 33 of the bent portion 27ax on the upper edge portion 27a side of the blade 27. It is attached and fixed with a nut 35. The opening pressure of the blade 27 can be adjusted depending on the number of weights 34 attached to the fixing bolts 33 or the position in the length direction of the fixing bolts 33 to fix the weights 34.

Further, by changing the number of the plurality of damper units 20A, 20B, 20B, 20C constituting the differential pressure damper 100, it is possible to correspond to the processing air volume at the installation location, so that a differential pressure damper is created for each processing air volume. There is no need to separate them, and the size of the damper unit can be standardized.

Further, since the plurality of damper units 20A, 20B, 20B, and 20C constituting the differential pressure damper 100 can be individually attached to and detached from the opening 11 of the fire door 10, for example, they are attached to the fire door 10 after construction. If the number of damper units is too large, remove any of the damper units 20A, 20B, 20B, and 20C, and attach a shielding member (not shown) such as a blank plate to close the traces. As a result, it is possible to accurately respond to changes in the situation.

In addition, if a shielding member (not shown) such as a blank plate is attached to the damper units 20A, 20B, and 20C in advance in a large opening in anticipation of the installation space of the damper unit for expansion, after construction. If the number of damper units is insufficient, the blank plate can be removed, and a damper unit can be added to the trace to attach the damper unit.

By unifying the sizes of the damper units 20A, 20B, and 20C and modularizing them in this way, the number of damper units 20A, 20B, and 20C installed can be increased or decreased even more easily.

As shown in FIG. 1, in normal times, the fire doors 10 and 10 are housed in the recesses 12a and 12a provided in the wall bodies 12 and 12, respectively, and when a fire occurs, the fire doors 10 and 10 are hinged 13 and It is a type that rotates 90 degrees in the direction of the arrow 14 around 13 and is in a closed state, but in addition to that, for a type of fire door (not shown) that is kept in a closed state even in normal times. However, the differential pressure damper 100 can be attached.

In this case, open the blade 27 of any of the fire door damper units 20A, 20B, and 20C that is always closed and locked by hand, insert the arm through the opening, and extend the finger to the lock mechanism of the fire door to unlock. It may be locked. Therefore, for the purpose of crime prevention, a wire mesh or a lattice material that covers the openings of the damper units 20A, 20B, and 20C can be installed.

Next, another embodiment relating to the fire door to which the differential pressure damper is attached will be described with reference to FIG. FIG. 17 is a partially omitted vertical cross-sectional view showing a fire door 10D to which a damper unit 20D having the same structure and function as the damper unit 20A shown in FIG. 4 is attached. The portion shown in FIG. 17 corresponds to the portion indicated by the arrow X in FIG.

As described above, in the embodiment shown in FIG. 4, the thickness 20t of the damper units 20A, 20B, 20B, 20C when the blades 27 of the damper units 20A, 20B, 20B, 20C are in the closed state is the thickness 20t of the fire door 10. The thickness is 10 tons or less. Therefore, when the damper units 20A, 20B, 20B, and 20C are in the closed state, the front 10f and the back 10e of the fire door 10 to the front 25f and the back 25e of the frame body 25 or the damper units 20A, 20B, 20B, 20C are configured. It has the advantage that the members do not protrude.

Generally, when the frame body 25D is manufactured by bending the damper unit 20D, as shown in FIG. 17, the outer peripheral surface of the edge portion 25Dc of the frame body 25D formed during the bending process becomes an R surface (convex curved surface). .. In this case, assuming the configuration as shown in FIG. 4, as shown in FIG. 17, the front surface 10Df of the fire door 10D is at the position of the two-point chain line Y, and the front surface 25Df of the frame body 25D is the two-point chain line Y. Since the fire doors 25 are in the same plane, the inner peripheral portion of the opening 11D of the fire door 25 and the outer peripheral portion of the frame body 25D are in close contact with each other without any gaps, but the peripheral portion 25Dc of the frame body 25D In many cases, a visible groove Q having a substantially V-shaped cross section is formed between the inner peripheral portion of the opening 11D of the fire door 10D. If the groove Q is visible from the outside, not only may it be mistaken that there is a gap between the inner peripheral portion of the opening 11D of the fire door 25 and the outer peripheral portion of the frame body 25D, but also the appearance (Design) may be hindered, or dust or the like may collect in the groove Q.

Therefore, in the embodiment shown in FIG. 17, the thickness 20Dt of the damper unit 20D when the blades (not shown) are in the closed state is made larger than the thickness 10Dt of the fire door 10D, as shown in FIG. The front surface 25Df and the back surface 25De of the frame body 25D constituting the damper unit 20D are arranged so as to project from the front surface 10Df and the back surface 10De of the fire door 10D, respectively. As a result, it is possible to prevent the groove Q from being formed at the boundary portion P between the opening 10 of the fire door 10D and the frame body 25D of the damper unit 20D, so that the appearance (design) is only improved. However, it is possible to prevent dust and the like from accumulating in the groove Q.

In the embodiment shown in FIG. 17, both the front surface 25Df and the back surface 25De of the frame body 25D constituting the damper unit 20D are arranged so as to project from the front surface 10Df and the rear surface 10De of the fire door 10D, respectively. Therefore, it is possible to arrange at least one of the front 25Df or the back 25D of the frame body 25D constituting the damper unit 20D so as to protrude from the front 10Df or the back 10De of the fire door 10D. The above-mentioned action and effect can be obtained.

The differential pressure damper 100 described with reference to FIGS. 1 to 17 shows an example of the differential pressure damper of the present invention, and the differential pressure damper of the present invention is limited to the above-mentioned differential pressure damper 100. is not.

The differential pressure damper according to the present invention is, for example, a material for adjusting the differential pressure between a region pressurized to a positive pressure state and an adjacent region in the building when a fire breaks out in the building. It can be widely used in industrial fields such as.

10,10D Fire doors 10e, 10De, 22a, 25e, 25De Back 10f, 10Df, 25f, 25Df Front 10t, 20t, 10Dt, 20Dt Thickness 11, 11D Opening 12 Wall 12a Recess 13 Hinge 14 Arrow line 15 Annex 16 Adjacent chamber 17 Arrow 17a Arrow line 20A, 20B, 20C, 20D Damper unit 21, 22, 23 Mounting part 24 Bolt 25, 25D Frame body 25a Long side part 25b Short side part 25c Inner peripheral surface 25d Side wall part 25Dc Edge part 26 Shaft body 27 Blade 27a Upper edge 27b Lower edge 27c Side edge 28 Through hole 29 Induction member 29a Induction surface 29b Upright surface 30 Double bearing 31 Inner peripheral bearing 32 Outer bearing 33 Fixing bolt 34 Weight 35 Nut 36, 37 Closing Member 100 Differential pressure damper P Boundary part Q Groove Y Two-point chain wire

Claims (8)

A differential pressure damper that is attached to an opening formed in a partitioning means for partitioning a space in a building and opens when a preset pressure difference is reached.
A damper unit having a frame body and a single blade rotatably attached to the frame body via a shaft body to open and close the area surrounded by the frame body.
A differential pressure damper including a fixing means for attaching a plurality of the damper units arranged in parallel in an opening formed in the partition means to the partition means. The differential pressure damper according to claim 1, wherein the thickness of the damper unit when the blades of the damper unit are in the closed state is equal to or less than the thickness of the partition means. Claim 1 or claim 1, wherein the fixing means includes a ridge-shaped mounting portion having a through hole in at least a part of the outer periphery of the frame, and a bolt screwed to the partition means through the through hole. The differential pressure damper described in 2. Claims provided with bent portions on the upper edge portion side and the lower edge portion side of the blade so that the upper edge portion and the lower edge portion are inclined from the downstream side to the upstream side, respectively, when the blade is in the closed state. Item 3. The differential pressure damper according to any one of Items 1 to 3. On the inner peripheral surface of the frame of the damper unit, a portion facing the lower edge portion of the blade which is in the closed state and at a position on the upstream side of the lower edge portion of the blade, an upward gradient is formed toward the downstream side. The differential pressure damper according to any one of claims 1 to 4, further comprising an induction member having an induction surface. A double bearing arranged coaxially with the shaft body is provided between the frame body and the shaft body.
The double bearing includes an inner peripheral bearing made of polytetrafluoroethylene-coated metal arranged on the outer periphery of the shaft body, and an outer peripheral bearing made of polytetrafluoroethylene arranged around the inner peripheral bearing. The differential pressure damper according to any one of claims 1 to 5. On the inner side surface of the frame body facing the side edge portion of the blade, a position above the shaft body and downstream of the upper edge portion of the blade, and below the shaft body of the blade. At a position upstream from the lower edge,
The differential pressure damper according to any one of claims 1 to 6, wherein a closing member is provided to hide a gap between the inner surface of the frame and the side edge of the blade. The differential pressure damper according to any one of claims 1 to 7, further comprising a fixing bolt projecting from a bent portion on the upper edge side of the blade and a weight attached to the fixing bolt.

Images