Smoke and fire dampers

Abstract

The present invention discloses a smoke exhaust fire damper, comprising a shell, a valve body and a valve locking mechanism; the valve body is symmetrically provided with two air vents, and two air vent cover plates corresponding to the air vents and rotating around a central rotation axis are provided inside the valve body; the air vent cover plate is driven to close by the air vent cover plate reset torsion spring and the air vent cover plate deadweight; the air vent cover plate, shell, valve body and valve locking mechanism are all made of metal materials; the thermal release lock of the valve locking mechanism is arranged on the side of the valve body close to the room, and after the thermal release lock is unlocked in a high temperature environment, the valve locking torsion spring of the valve locking mechanism drives the valve locking rod to rotate from the middle to the left and right sides, and the top of the valve locking rod rotates to the valve locking point close to the outer edge of the air vent cover plate, so that the air vent cover plate is locked in the air vent. The smoke exhaust fire damper of the present invention arranges the thermal release lock of the valve locking mechanism on the side of the valve body close to the room; when the external flue temperature exceeds the threshold, the thermal release lock releases the valve locking rod within 10 seconds, so that the protection action is faster and the effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of flues, and in particular to a smoke exhaust fire damper. Background Art

[0002] Smoke exhaust fire dampers are special valves that are used to open when exhausting smoke, so that the exhaust fan can exhaust smoke from the internal space; when the external flue is on fire, the valve is closed to prevent the external open fire from entering the internal space from the flue. At present, there are many types of smoke exhaust fire dampers, and the protection forms used are various, but there is still room for improvement. Summary of the invention

[0003] The purpose of the present invention is to provide a smoke exhaust fire damper which has a novel and unique structure, is easy to use, and can provide reliable protection; the specific technical scheme is:

[0004] A smoke exhaust fire damper comprises a shell, a valve body and a valve locking mechanism; the valve body is symmetrically provided with two air outlets, and two air outlet cover plates corresponding to the air outlets and rotating around a central rotation axis are provided on the inner side of the valve body; the air outlet cover plates are driven to close by the air outlet cover plate reset torsion spring and the air outlet cover plate deadweight; the air outlet cover plate, shell, valve body and valve locking mechanism are all made of metal materials; the thermal release lock of the valve locking mechanism is arranged on the side of the valve body close to the room, and after the thermal release lock is unlocked in a high temperature environment, the valve locking torsion spring of the valve locking mechanism drives the valve locking rod to rotate from the middle to the left and right sides, and the top of the valve locking rod rotates to the valve locking point close to the outer edge of the air outlet cover plate, so that the air outlet cover plate is locked in the air outlet.

[0005] Furthermore, the two tuyere cover plates rotate around their respective central rotation axes; the distance between the two central rotation axes is greater than the distance between the outer edges of the valve locking rod.

[0006] Furthermore, the thermal release lock comprises a shell and a thermal release core. The thermal release core is fixedly arranged in the shell, and a threaded hole for fixing a screw is arranged on the thermal release core.

[0007] Furthermore, the angle between the rotation axis of the valve locking rod and the air outlet plane is less than 90 degrees and greater than 80 degrees.

[0008] Furthermore, a valve locking groove adapted to the inner edge of the tuyere is rolled on the inner side of the tuyere cover plate, and the valve locking point is arranged in the valve locking groove.

[0009] Furthermore, a rubber pad is provided between the air outlet cover plate and the air outlet.

[0010] Furthermore, the rubber pad is arranged on the air outlet cover plate.

[0011] Furthermore, the melting temperature of the low temperature solder is lower than 300 degrees Celsius.

[0012] Furthermore, the angle between the plane of the tuyere and the horizontal plane is between 75 and 85 degrees.

[0013] The smoke exhaust fire damper of the present invention arranges the thermal release lock of the valve locking mechanism on the side of the valve body close to the room; when the external flue temperature exceeds the threshold value, the thermal release lock releases the valve locking rod within 10 seconds, and the valve locking rod opens under the action of the reset spring, forcibly closes the valve, and effectively locks it, so that the protection action is faster and the effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the smoke exhaust fire damper of the present invention;

[0015] Figure 2 This is a three-dimensional diagram of the smoke exhaust fire damper structure of the present invention;

[0016] Figure 3 This is a left view of the schematic diagram of the smoke exhaust fire damper of the present invention;

[0017] Figure 4 This is a three-dimensional diagram of the principle diagram of the smoke exhaust fire damper of the present invention;

[0018] Figure 5 This is a back perspective view of the schematic diagram of the smoke exhaust fire damper structure of the present invention;

[0019] Figure 6 This is an exploded view of the schematic diagram of the thermal release nut structure of the present invention;

[0020] Figure 7 Schematic diagram of the valve lock mechanism structure.

[0021] In the figure: 1. Shell; 2. Valve body; 3. Air vent cover; 4. Valve locking mechanism; 41. Mounting seat; 42. Base; 421. Locking structure; 43. Valve locking stem; 431. Avoidance area; 44. Locking buckle; 45. Valve locking torsion spring; 46. Thermal release lock; 461. Copper cap; 462. Thermal release core; 47. Locking buckle screw; 5. Air vent cover reset torsion spring; 6. Reset torsion spring support rod; 7. Air vent cover shaft seat; A. Rotation center axis; B. Valve locking point; C. Starting spacing; α, Rotation axis deflection angle. DETAILED DESCRIPTION

[0022] The present invention is described more fully below using embodiments. The present invention can be embodied in many different forms and should not be construed as being limited to the exemplary embodiments described herein.

[0023] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", etc. may be used herein to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the elements described as being "below" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here can be interpreted accordingly.

[0024] like Figure 1 and Figure 2 As shown, the smoke exhaust fire damper in this embodiment includes a housing 1, a valve body 2 and a valve locking mechanism 4; the valve body is symmetrically provided with two air ports, and the inside of the valve body is provided with two air port covers 3 corresponding to the air ports and rotating around the central rotation axis; the air port cover 3 is driven to close by the air port cover reset torsion spring and the air port cover deadweight; the air port cover 3, the housing 1, the valve body 2 and the valve locking mechanism 4 are all made of metal materials. The central rotation axis should avoid the thermal release lock, for example, it is divided into upper and lower ends, or the connecting end is set to an arc shape to avoid the locking screw 47 of the fixed lock plate 44.

[0025] like Figure 5 As shown, the thermal release lock 46 of the valve locking mechanism is arranged on the side of the valve body close to the room. After the thermal release lock 46 is unlocked in a high temperature environment, the valve locking torsion spring 45 of the valve locking mechanism 4 drives the valve locking rod 43 to rotate from the middle to the left and right sides, and the top of the valve locking rod 43 rotates to the valve locking point B close to the outer edge of the air outlet cover plate 3, so that the air outlet cover plate 3 is locked in the air outlet.

[0026] In order to prevent the valve lock rod 43 from limiting the opening angle of the two tuyere cover plates, the tuyere cover plates 3 rotate around their respective central rotation axes; the distance between the two central rotation axes is greater than the distance between the outer edges of the valve lock rod. In this way, the tuyere cover plates 3 can be opened to be perpendicular to the tuyere plane, minimizing the resistance of the tuyere cover plates.

[0027] The tuyere cover plate reset torsion spring 5 is arranged at the upper end or the lower end of the valve body 2, or both ends; the tuyere cover plate reset torsion spring 5 is sleeved on the reset torsion spring support rod 6; one end of the reset torsion spring support rod 6 is fixed on the tuyere cover plate shaft seat 7; or both ends are fixed on the fixed seat. The rotating shaft of the tuyere cover plate is also fixed on the tuyere cover plate shaft seat 7.

[0028] like Figure 6As shown, the thermal lock 46 includes a shell and a thermal core 462. The thermal core 462 is fixedly arranged in the shell, and a threaded hole for fixing the locking screw 47 is arranged on the thermal core 462. The locking screw 47 passes through the locking buckle 44 and the middle strip of the valve body 2. The diameter of the through hole arranged in the middle strip of the valve body 2 is larger than the diameter of the screw and smaller than the diameter of the copper cap 461. The locking valve stem 43 is locked by being fixedly connected with the thermal core 462 through the threaded hole. When a fire occurs indoors, since the thermal core 462 including the thermal core 462 is installed on one side of the indoor space, the high-temperature gas and flame directly act on the thermal core 462 without the shielding of the air outlet cover plate 3. The thermal core 462 will melt quickly, the force fixing the locking buckle 44 will disappear, the locking valve stem 43 will be unlocked, and the air outlet cover plate 3 will be locked, or closed and locked. The valve lock startup process basically does not exceed 10 seconds, which is much lower than the 20 seconds specified in the standard. After the fire is extinguished, the smoke exhaust fire damper can be repaired by simply replacing the thermal release lock 46.

[0029] The downward locking edge of the fixed lock buckle 44 is an inclined surface, which decomposes the valve lock torsion spring 45 to twist the valve lock stem 43 to generate an upward thrust. When the thermal release lock is released, the fixed lock buckle 44 moves upward, and the locking edge no longer restricts the rotation of the valve lock stem 43.

[0030] The outer shell can be made of copper cap 461 using red copper having particularly good heat transfer performance, so that the pyrolytic core 462 melts faster.

[0031] The thermal release lock 46 is not limited to Figure 6 The structure shown in the figure can also be provided with a threaded hole on the copper cap 461, and the locking screw 47 can be divided into two sections; the two sections of the screw are fixed by welding with low-temperature solder such as tin; the through hole diameter provided in the middle strip of the valve body 2 is larger than the diameter of the screw and smaller than the diameter of the copper cap 461. When the copper cap 461 is heated, the low-temperature solder melts, and the two sections of the screw are separated, thereby achieving unlocking.

[0032] Alternatively, a magnetic steel and a steel locking screw 47 may be used in combination; the magnetic steel is arranged on one side of the room, and the front end of the locking screw 47 is threaded to fix the iron sheet; the magnetic steel is used to absorb the iron sheet and the locking screw 47 to fix the lock 44 and lock the valve rod 43. When a fire occurs, the high temperature demagnetizes the magnetic steel and unlocks the valve rod 43.

[0033] The material of the pyrolytic core is not limited to tin, but may also be other low-temperature metals or plastics; the melting temperature of the pyrolytic core is lower than 300 degrees Celsius.

[0034] like Figure 3 and Figure 4As shown, the rotation center axis A of the rotation axis of the lock valve rod 43 forms a certain angle with the lower section of the central rotation axis of the tuyere cover plate 3; the rotation axis deflection angle α should be less than 90 degrees; and greater than 80 degrees; when the lock valve rod 43 is in the middle position, there is a starting spacing C between the top of the lock valve rod 43 and the tuyere plane. The top of the lock valve rod 43 rotates outward under the drive of the lock valve torsion spring 45, and during the rotation, the top of the lock valve rod 43 pushes the tuyere cover plate 3 to the tuyere closed position; the gap between the top of the lock valve rod 43 and the tuyere plane gradually decreases, and when the top of the lock valve rod 43 rotates to the lock valve point B on the outer edge of the tuyere cover plate 3, the tuyere cover plate 3 completely closes the tuyere, and no longer continues to flip under the support of the tuyere plane; the lock valve rod 43 stops rotating because the top is blocked by the tuyere cover plate 3. Since the rotation axis deflection angle α is close to 90 degrees near the valve locking point B, the component force of the air vent cover plate 3 on the top end of the valve locking rod 43 along the plane of the air vent cover plate is small and cannot overcome the friction between the valve locking rod 43 and the air vent cover plate 3; even if the torque of the valve locking torsion spring 45 is reduced or disappears, the position of the valve locking rod 43 will not move and the valve locking state can still be maintained.

[0035] In order to reduce the noise when closing the fire damper, a rubber pad is provided between the air outlet cover plate 3 and the periphery of the air outlet. The rubber pad is high temperature resistant silicone rubber.

[0036] In order to protect the rubber pad and avoid contact between the rubber pad and open flame, the air vent cover plate 3 is arranged as an inner and outer layer; the outer layer is slightly larger than the air vent opening and can close the air vent; the rubber pad is sandwiched between the two layers of cover plates, and the exposed rubber pad forms a sealing structure at the periphery of the air vent; the exposed rubber pad is bonded to the inner side of the outer cover plate, and the outer cover plate provides support for the exposed rubber pad.

[0037] In order to improve the sealing effect, the inner edge of the air outlet is set to be recessed toward the public flue side; forming an inclined surface; corresponding to the inclined surface, the outer cover plate is recessed toward the indoor flue side; the two inclined surfaces cooperate to increase the sealing surface area when the valve is closed.

[0038] In order to prevent the valve locking rod 43 from rotating after the valve locking torsion spring 45 fails at high temperature, resulting in the fire damper valve locking failure; the air inlet cover plate 3 is rolled with a valve locking groove on the inner side; and the valve locking point B is set in the valve locking groove. When the valve locking torsion spring 45 cannot provide sufficient torque, the top end of the valve locking rod 43 cannot rotate due to the obstruction of the valve locking groove, and can still stay at the valve locking point B, thereby avoiding valve locking failure.

[0039] The low temperature solder is not limited to solder, and the melting temperature of the low temperature solder can be lower than 300 degrees Celsius.

[0040] The angle between the plane of the tuyere and the horizontal plane is between 75 and 85 degrees; that is, the deadweight of the tuyere cover plate 3 is used to assist in closing the valve; and the axial length of the shell is slightly affected.

[0041] like Figure 7 As shown, the base 42 is provided with a mounting hole for the rotating shaft; the valve locking torsion spring 45 is passed through the rotating shaft; the stationary end is fixed to the mounting base 41 or the base 42; the rotating end is connected to the valve locking rod 43; after the lock is disconnected, the valve locking rod 43 is driven to rotate to both sides. The valve locking torsion springs 45 of the two valve locking rods 43 can be set separately, or the stationary ends can be connected together, and the release rotation direction is set to be opposite.

[0042] A locking structure 421 can also be set on the top of the outer base 42; as shown in the U-shape in the figure, when locking the valve, the bottom of the U-shaped locking structure 421 can be used to assist in limiting the maximum rotation angle of the valve locking rod 43; the outer wall of the U-shaped locking structure 421 can limit the axial movement of the rotating shaft after the valve locking torsion spring 45 fails, thereby avoiding valve locking failure.

[0043] The top end of the valve locking rod 43 may also be provided with an avoidance area 431 ; the top end of the valve locking rod 43 is bent or folded outwardly to avoid the central rotation axis; thus, the starting distance C can be prevented from being too large.

[0044] The above examples are only used to illustrate the present invention. In addition, there are many different implementations. These implementations are all conceivable by those skilled in the art after understanding the concept of the present invention. Therefore, they are not listed here one by one.

Claims

1. A smoke exhaust fire damper, comprising a housing, a valve body and a valve locking mechanism; the valve body is provided with two vents symmetrically on the left and right, and the inner side of the valve body is provided with two vent covers corresponding to the vents and rotating around a central rotation axis; the vent cover is driven to close by a vent cover return torsion spring and the deadweight of the vent cover; the vent cover, housing, valve body and valve locking mechanism are all made of metal materials; characterized in that, The thermal release lock of the valve lock mechanism is arranged on the side of the valve body close to the room. After the thermal release lock is unlocked in a high temperature environment, the valve lock torsion spring of the valve lock mechanism drives the valve lock rod to rotate from the middle to the left and right sides, and the top of the valve lock rod rotates to the valve lock point close to the outer edge of the air outlet cover plate, so that the air outlet cover plate is locked in the air outlet; the thermal release lock includes an outer shell and a thermal release core, the thermal release core is fixedly arranged in the outer shell, and a threaded hole for fixing the locking screw is arranged on the thermal release core; the locking screw passes through the locking buckle and the middle strip of the valve body; the through hole diameter arranged in the middle strip of the valve body is larger than the diameter of the locking screw and smaller than the diameter of the copper cap; it is fixedly connected to the thermal release core through the threaded hole; the two air outlet cover plates rotate around their respective central rotation axes respectively; the distance between the two central rotation axes is larger than the distance between the outer edges of the valve lock rod; the air outlet cover plate is rolled with a valve lock groove adapted to the inner edge of the air outlet, and the valve lock point is arranged in the valve lock groove.

2. The smoke exhaust fire damper according to claim 1, characterized in that: The angle between the rotation axis of the valve lock rod and the air outlet plane is less than 90 degrees and greater than 80 degrees.

3. The smoke exhaust fire damper according to claim 1, characterized in that: A rubber pad is arranged between the air outlet cover plate and the air outlet.

4. The smoke exhaust fire damper according to claim 3, characterized in that: The rubber pad is arranged on the air outlet cover plate.

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