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公开(公告)号：EP4390887A1
公开(公告)日：2024-06-26
申请号：EP23193816.8
申请日：2023-08-29
IPC分类号： G08B17/113
CPC分类号： G08B17/113
摘要： A housing for a scattered light detection unit of a smoke detection device, the housing comprises a base (2) fastened to a mounting plate (1), the base is provided with guiding channels (8) for mounting and directing optical elements, and limiting barriers (9) are attached to the channels (8), the barriers are arranged on an inner end surface (10) of the base (2) and surrounded by an opaque wall (7) that is concentric to a lateral outer wall (6), a casing (3) mounted on the base (2), the casing has a lateral portion (13) that encompasses the base (2) and the mounting plate (1) and a disc portion (15) that is parallel to the base (2), the disc portion is provided with an opening (16) having an edge that is directed towards the base (2) and coaxial to the opaque wall (7), and a cover element (7) that is fastened on the casing (3).
A configuration of the housing elements enables to create a smoke chamber having a first part that is formed by the base (2) and the casing (3) and a second part that is formed by a central portion (19) provided in the cover element (4), while providing a slit (24) between them, and a gas-air mixture comes into the smoke chamber through the slit and concentrates therein due to making a curved inner end surface of the central portion (19) with a transition to a cone-like protrusion (28). Therewith, paths of incoming and filtration of the gas-air mixture are provided, from outside, by making series of concentrically arranged slit-like openings (21) in a peripheral portion (20) of the cover element (4) and its division into sectors by radial partitions (26).-
公开(公告)号：EP4332935A3
公开(公告)日：2024-05-08
申请号：EP23175100.9
申请日：2023-05-24
IPC分类号： G08B17/107
CPC分类号： G08B17/107 , G08B17/113
摘要： The group of inventions relates to the field of fire alarm tools. A smoke detection device comprises a housing, and a control unit with a power unit and a scattered light sensor connected thereto are arranged within the housing, and the sensor consists of an optical chamber having a first emitter, a second emitter and a photoreceiver arranged therein. The optical chamber is surrounded by a filtering chamber having output openings provided therein, the openings are coupled to the optical chamber via a labyrinth that terminates with a ring slit that is provided between the optical chamber and a filtration chamber along a circumference of the optical chamber. The control unit is configured to constantly providing power impulses to the first emitter, as well as to connect the second emitter to the power unit at a moment when a threshold signal arises at the photoreceiver, to determine levels of signals of the photoreceiver which arise during a successive providing of the power impulses to the first and the second emitters, as well as to form the alarm signal if the signal level of the photoreceiver within the second emitter connection period is at least 20% greater than the signal level of the photoreceiver within the first emitter connection period, which defines the claimed operation method of the device. Therewith, the scattered light sensor is configured such that the first emitter has a wavelength of 940nm+/-5% and generates an emission in a cone having a solid angle of maximum 5 degrees, the second emitter has a wavelength of 470nm+/-5% and generates an emission in a cone having a solid angle of maximum 9 degrees, and the photoreceiver has a sensitivity range from 400 nm to 1100 nm. Therewith, the emitters and the photoreceiver are arranged along a circumference of the optical chamber with an angle of 15+/-2 degrees formed between an optical axis of each of the emitters and a horizontal plane, an angle of 23+/-2 degrees formed between optical axes of the first and second emitters, and an angle of 22+/-2 degrees formed between an optical axis of the photoreceiver and the horizontal plane.
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公开(公告)号：EP4332935A2
公开(公告)日：2024-03-06
申请号：EP23175100.9
申请日：2023-05-24
IPC分类号： G08B17/107
摘要： The group of inventions relates to the field of fire alarm tools. A smoke detection device comprises a housing, and a control unit with a power unit and a scattered light sensor connected thereto are arranged within the housing, and the sensor consists of an optical chamber having a first emitter, a second emitter and a photoreceiver arranged therein. The optical chamber is surrounded by a filtering chamber having output openings provided therein, the openings are coupled to the optical chamber via a labyrinth that terminates with a ring slit that is provided between the optical chamber and a filtration chamber along a circumference of the optical chamber. The control unit is configured to constantly providing power impulses to the first emitter, as well as to connect the second emitter to the power unit at a moment when a threshold signal arises at the photoreceiver, to determine levels of signals of the photoreceiver which arise during a successive providing of the power impulses to the first and the second emitters, as well as to form the alarm signal if the signal level of the photoreceiver within the second emitter connection period is at least 20% greater than the signal level of the photoreceiver within the first emitter connection period, which defines the claimed operation method of the device. Therewith, the scattered light sensor is configured such that the first emitter has a wavelength of 940nm+/-5% and generates an emission in a cone having a solid angle of maximum 5 degrees, the second emitter has a wavelength of 470nm+/-5% and generates an emission in a cone having a solid angle of maximum 9 degrees, and the photoreceiver has a sensitivity range from 400 nm to 1100 nm. Therewith, the emitters and the photoreceiver are arranged along a circumference of the optical chamber with an angle of 15+/-2 degrees formed between an optical axis of each of the emitters and a horizontal plane, an angle of 23+/-2 degrees formed between optical axes of the first and second emitters, and an angle of 22+/-2 degrees formed between an optical axis of the photoreceiver and the horizontal plane.
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