FIRE PROTECTION AND SMOKE EXTRACTION DEVICE FOR VENTILATING SYSTEMS, COMPRISING AT LEAST ONE CLOSURE MEMBER Description The invention relates to a fire protection and smoke extraction device for ventilation and smoke extraction systems, the device comprising at least one blocking member that is pivotably arranged in a casing, wherein the casing id is adapted to be inserted into a ventilation or smoke extraction passage, and wherein seals are associated with the blocking member when it is in a posi- tion in which it closes-off the cross-section of the casing, each seal having at least one seal portion made of an intumescence material and arranged in the longitudinal center plane of the blocking member in its closed position.
Fire protection systems with blocking members are known for the event of fire.
They close-off a ventilation duct which may for example pass through a wall in order to prevent sparks, smoke and heat from being transmitted into an adjacent room.
Smoke extraction devices with blocking members are also sä known in the art.
The latter may be closed under normal conditions but will open in the event of fire, notwithstanding the attack of fire, in order to enable smoke extraction via smoke extraction passages or ducts.
The invention relates to a combined fire protection and smoke extraction de- vice the blocking member of which closes-off a ventilation duct or a smoke estraction duct in order to prevent progression of the fire but may also be opened in order to enable the passage of smoke.
According to the pertinent standards, such a fire protection and smoke extraction device must be capa- ble of being closed in the event of fire and, after it has been closed, must be 33 able to be opened once again for a presumed smoke extraction event.
The seals of the fire protection and smoke extraction device must assure a tight closure of the ventilation or smoke extraction system in the closed state and,
in an event of opening or reopening, respectively, they must not compromise the movement of the blocking member.
A fire protection device according to the preamble of claim 1 has been dis- closed in DE 103 50 872 A1. There, unilateral stops are provided for the blocking blade in order to limit the pivotal movement thereof.
A fire protection valve is also known from EP 0 512 414 A2. It is an object of the invention to provide a fire protection and smoke extrac-
id tion device as mentioned above which is improved in enabling both, a tight closure in the event of fire, and an opening and re-opening for extracting smoke.
According to the invention, this object is achieved by a fire protection and i3 smoke extraction device according to claim 1, wherein said seal portion made of intumescence material is associated on both sides with a respective seal portion made of a non-intumescence material, said seal portions being ar- ranged in recesses in a wall of the casing, and the seal portions made of non- intumescence material are enclosing the respective seal portion made of in- sä tumescence material such that the intumescence material is not directly ex- posed to exerted heat.
In the fire protection and smoke extraction device according to the invention, the seal comprises at least one seal portion made of intumescence material.
Such a material expands at elevated temperatures and can therefore entirely fill and seal an interspace between the casing wall the blocking member.
This is why this material has proven useful in fire protection devices with blocking members.
However, the fire protection device according to the invention is also a smoke extraction device, so that, in order to fulfil the pertinent standards, in partic- ular European standards, it must be designed to be openable for an extrac- tion of smoke in the event of fire.
The intumescence material must not compromise this opening process.
To that end, the invention proposes that the intumescence material is preferably protected, preliminary or for a nec- essary time span, from an attack of heat that would provoke ist expansion.
On both sides of the seal portion made of intumescence material there are provided other seal portions made of non-intumescence material that will in so far provide an initial protection of the intumescence material from the at- tack of heat.
This is in particular the case when the pivotable blocking mem- ber is in its closed position.
Then, it is associated with a portion of the wall of the casing.
The seals are also arranged in this wall portion.
The seal portion id made of intumescence material is arranged in the longitudinal center plane of the blocking member in its closed position and is flanked on either longi- tudinal side of the seal portion by the seal portions made of non-intumes- cence material.
Thus, the seal portion made of intumescence material is en- capsulated so that incoming heat cannot directly act on this intumescence 5 material.
The fire protection and smoke extraction device according to the invention can in this way withstand fire attacks for a certain time solely due to the func- tionality of the seal portions made of non-intumescence material.
The seal a portions do not change to such an extent that an opening or re-opening of the blocking member would be prevented.
Thus, it is still possible to open the blocking member for a smoke extraction operation following at a later time.
If the fire protection and smoke extraction device according to the invention 2% is not used for the smoke extraction operation and/or it remains closed and is therefore exposed to the fire to a larger extent.
Then, after a necessary span of time for a possible opening of the blocking member, the seal portions made of non-intumescence material will gradually degrade in their heat in- sulting and sealing effect due to the temperature rise.
Thus, the protection provided by the seal portion made of non-intumescence material will decay by and by.
Heat is increasingly transferred onto the intumescence material so that this material reacts and expands.
Then, the blocking member will be fixated by the intumescence material, and a tight and enduring fire protection is established.
According to the invention, the seal portions are arranged in recesses of a wall of the casing.
Both, the seal portion made of intumescence material and the seal portions made of non-intumescence material may be arranged in recesses.
Thereby, the three inner cross section of the casing is enlarged and, in particular, the pivotal movement of the blocking member is not com- promised by portions projecting into the pivot trajectory.
Further, the recess for the seal portion made of intumescence material may be larger than at least one recess for the seal portion made of non-intumes- cence material.
In this design, the seal portion made of intumescence mate- rial is somewhat more remote from the inner cross-section of the casing, 1% whereby its insulating effect against a heat attack can be improved.
In this design, a cavity will form above the seal portion made of intumescence material so that, in spite of the shielding provided by the seal portions made of non-intumescence material, it may expand to some extent without com- promising the mobility of the blocking member.
Only when the heat attack sä continues will the intumescence material expand so far that it fills the cavity and engages the blocking member.
According to another further development of the invention, a seal made of non-intumescence material may be arranged to project into the pivot trajec- 2% tory of the blocking member in the range of the closed position of the latter.
This projecting seal may form a stop for the blocking member.
Since the pro- jecting seal projects into the pivot trajectory in the range of the closed posi- tion of the blocking member, the blocking member will be in its closed position when it abuts the projecting seal.
It is thus associated with the further seal made of non-intumescence material as well as the seal made of intumes- cence material.
The seal portions may respectively be provided in the form of strips. Such strips may be arranged side-by-side, a strip made of intumescence material being flanked by a respective strip of non-intumescence material on either side. The seals made of non-intumescence material may be made of mineral ma- terials, glass-silk or silicates or else combinations of these materials. Embodiment examples of the invention, which disclose further inventive fea- id tures, have been shown in the drawing, wherein:
Fig. 1 is a combined side view and sectional view of a fire protection and smoke extraction device according to a first embodiment, with a blocking member in a closed position;
Fig. 2 is a combined side view and sectional view of the fire protection and smoke extraction device according to Fig. 1, with the blocking member in the open state; a0 Fig. 3 is a sectional view on a larger scale along the section line III- II in Fig. 1;
Fig.4 is a sectional view on a larger scale along the section line IV- IV in Fig. 2;
Fig.5 is a view of the detail V in Fig. 3 on a still larger scale;
Fig. 6 is a combined side view and sectional view of a fire protection and smoke extraction device according to a second embodi- ment, with the blocking member closed;
Fig. 7 is a combined side view and sectional view of the fire protection and smoke extraction device according to Fig. 6, with open blocking member;
Fig. 8 is a sectional view on a larger scale along the sectional line VIII-VIII in Fig. 6 ;
Fig.9 is a sectional view on a larger scale along the sectional line IX- IX in Fig. 7 on a larger scale; and
Fig. 10 isa view of the detail X in Fig. 8 on a still larger scale. The fire protection and smoke extraction device according to each of the two embodiment examples has a rectangular casing 1 with a blocking member 2 i pivotably inserted therein. The casing 1 is provided on its outer side with a circumferential frame 3 that is placed on the walls 4 of the casing 1. The sectional views in Fig. 4 and in Fig. 9 show, respectively in the open position of the blocking member 2, strip-shaped seal portions on the internal s side of the housing wall 4. These are three seal portions, respectively, which are described in greater detail in the enlarged views in Fig. 5 and 10. In Fig. 5, the longitudinal center plane of the blocking member 2 has been indicated as a dashed line 5. A first seal portion 8 made of intumescence 2% material is arranged in this longitudinal center plane. This seal portion 8 made of intumescence material is framed on each of its longitudinal sides by a seal portion 7 made of non-intumescence material. In the first embodiment example according to Figs. 1 to 5, the seal portions 8, 7 are arranged in a recess of the wall 4, the largest recess being provided for the seal portion 8 made of intumescence material. A cavity 6 is formed above the seal portion 8 made of intumescence material.
In the second embodiment example in Figs. 6 to 10, recesses for the seal portions are again provided in the wall 4 of the casing 1. A first seal portion 7 made of non-intumescence material as well as the seal portion 8 made of intumescence material are arranged in one recess, a second seal portion 7 made of non-intumescence material is arranged in a smaller recess.
Further, this portion 7 made of non-intumescence material projects further into the interior of the casing 1, whereby this portion 7 forms a stop for the pivotal movement of the blocking member 2. A cavity 6 above the portion 8 made of intumescence material is also provided in this embodiment.
The walls 4 of the casing 1 are preferably made of a silicate material.
The circumferential frame resting on the walls 4 has an internal metal profile 9 that is covered by silicate portions 10.
5 All features recited in the above description and in the claims can arbitrarily be selected and combined with the features of the independent claim.
The disclosure of the invention is therefore not limited to the combinations of fea- tures that have been described or claimed, rather, all combinations that ap- pear as useful in the framework of the subject matter of the claims shall be si considered as disclosed.