RU144798U1 - COMBINED FIRE DETECTOR - Google Patents

Abstract

1. Combined fire detector, made in the form of a body of revolution, comprising a base and a cover detachably interconnected with smoke sampling openings and jumpers, a smoke detector, a circuit board with an indicator and a heat-sensitive element, a grid, a grid holder with holes for an indicator and a heat-sensitive element, characterized the fact that the lid is made with an annular surface, on the outside of which arcuate racks protruding to the top of the lid protrude, the inner side is made peripheral a circular surface that positions the grid and restricts smoke sampling openings from above, and a protrusion for the direction of smoke is formed along the outer arc of the circumference of the annular surface, mating with the outer edges of the smoke sampling apertures, while the grid holder embedded in the lid is made in the form of a cylindrical side surface with installation recesses turning into a guide surface made with a test button and a hole for the indicator and paired with a horizontal ring with a recess for the mesh, connected m through support corresponding dymozabornym jumpers, with the disk corresponding to the inner diameter of the annular surface of the cover, wherein an opening for thermosensitive elementa.2. The combined fire detector according to Claim 1, characterized in that the test button is made in the form of two radial slots located under nearby smoke bridges. 3. The combined fire detector according to claim 1, characterized in that the hole for the indicator is made on the test button.

Description

The utility model relates to fire fighting equipment, namely, fire alarms, and is intended to give an alarm message when the temperature rises or when scattered radiation due to smoke is detected in enclosed spaces of various buildings and structures.

Known fire detector combined, described in patent WO 2011089879 "Detector", IPC G08B 17/10, G01N 27/416 (published July 28, 2011, website worldwide.espacenet.com), made in the form of a body of revolution and containing detachably connected between a base and a cover with smoke sampling openings and jumpers, a circuit board with an indicator and a heat-sensitive element, a grid covering the side of the smoke detector. A hole for the indicator and a protective casing of the thermosensitive element, made in the form of a frame-like structure protruding above the top of the lid, are placed in wide smoke sampling jumpers.

However, this design solution reduces the area of the chimney, fixing the grid on the smoke detector complicates the cleaning of the detector, and the protective casing and the heat-sensitive element are easily damaged during transportation, installation and maintenance. In addition, the detector does not have a test button, which reduces its reliability.

The combined fire detector described in the patent for invention EP 2402920 Combined heat and smoke detector, IPC G08B 17/06, G08B 17/103 (published on January 4, 2012, worldwide.espacenet.com), made by in the form of a body of revolution, containing a base and a cover detachably interconnected with smoke sampling openings and jumpers, a circuit board with an indicator and a heat-sensitive element, a smoke detector, a grid, a grid holder with holes for an indicator and a heat-sensitive element. The circuit board is fixed on the base, it is equipped with a plastic-molded shielding casing covering the entire upper surface of the circuit board, on which the grid holder is fixed with latches, made with holes for the indicator and the heat-sensitive element, with a smoke detector in the center and a grid covering the labyrinth part of the smoke detector. The indicator and the thermosensitive element are located in the corresponding holes of the shielding casing and the grid holder and protrude into the smoke sampling openings of the cover.

However, the above-described combined fire detector has a complex assembly technology. The location of the indicator and the heat-sensitive element in the space of the smoke sampling openings degrades the aerodynamic characteristics of the detector and reduces its reliability. In addition, the device does not have a test button to test the detector's operability.

The inventors were faced with the task of developing a reliable and technologically advanced combined fire detector that provides stable smoke sensitivity and determines the temperature increase when changing the magnitude and direction of the air flow, with a large smoke area and convenient manual testing of performance.

The problem is solved in that a fire detector is proposed, made in the form of a body of revolution, containing detachably interconnected base and cover with smoke sampling openings and jumpers, a smoke detector, a circuit board with an indicator and a heat-sensitive element, a grid, a grid holder with holes for the indicator and heat sensitive element. New in the inventive detector is that the cover is made with an annular surface, on the outside of which there are arched racks that extend to the top of the cover, on the inside there is a peripheral circular surface that positions the grid and restricts smoke sampling openings from above, and on the outer arc of the circumference of the annular surface a protrusion is formed for directing smoke, coupled with the outer faces of the smoke sampling bridges, while the mesh holder embedded in the lid is made in the form of a cylindrical a lateral surface with mounting recesses, turning into a guide surface made with a test button and an indicator hole and paired with a horizontal ring with a mesh recess connected through supports corresponding to smoke sampling jumpers, with a disk corresponding to the inner diameter of the annular surface of the cover in which hole for temperature sensitive element. In this case, the test button is made in the form of two radial slots located under nearby smoke sampling jumpers, and a hole for the indicator is located on the test button.

The technical result consists in improving the manufacturability of the combined fire detector assembly, improving the design of the smoke entry zone and the heat-sensitive zone, and increasing the reliability of operation.

Manufacturability of assembly is achieved by performing a peripheral circular surface on the inner surface of the lid for quick and reliable positioning of the upper edge of the mesh, as well as by performing a mesh holder with a cylindrical lateral surface embedded in the cover, on which mounting recesses are formed corresponding to the elements of the cover and base connection with a recess for the lower edge of the mesh on a horizontal ring and with a disk with an opening for a heat-sensitive element. Improvement in the design of the smoke entry zone and the heat-sensitive zone is achieved by making the lid with an annular surface, on the outer side of which arcuate racks passing to the top of the lid protrude, with a peripheral circular surface that positions the grid and restricts smoke intake openings from above, and a protrusion for the direction of smoke that slopes overhanging over it along the outer arc of the circumference of the annular surface and paired with the outer edges of the smoke sampling jumpers, as well as due to spruce mesh with an inclined guide surface, conjugated with a horizontal ring made by a recess for the mesh and connected through supports corresponding to the smoke sampling jumpers, with a disk corresponding to the inner diameter of the annular surface of the lid, so the plane of the smoke inlet is perpendicular to the horizontal air flow and the air flow is directed inwards detector housing, providing the best ventilation of the internal volume of the housing and unhindered intake of smoke in the smoke Tector, and free access of heated air to heat-sensitive zone. Improving the reliability of the device is achieved through the introduction of the test button and due to the structural separation of the heat-sensitive zone and the smoke intake zone so that when installing a fire detector combined on the ceiling, the heat-sensitive zone will be located below the smoke intake zone and separated from it by the annular surface of the lid with the mounted grid holder disk that will ensure the correct detection of changes in the temperature of the ascending due to the natural convection of the heated air stream. In addition, the indicator hole and the test button are located on the inclined guide surface of the grid holder so that in the assembled detector they are located in the recess between two nearby smoke sampling jumpers that protect against accidental pressing or breakage, but do not impede access to the button and visual perception of the indicator .

In FIG. 1 is a cross-sectional view of a combined fire detector; in FIG. 2 - general view of the detector components; in FIG. 3 - cover, bottom view; in FIG. 4, 5, 6 - grid holder, side view, top and bottom, respectively.

Combined fire detector 1 (Fig. 1, 2), is molded from plastic in the form of a body of revolution and contains detachably interconnected base 2 with connection elements, for example, latches 3 (Fig. 2) and cover 4 (Fig. 1, 2 , 3), made with smoke sampling openings 5 (Fig. 2, 3) and jumpers 6 (Fig. 1, 2, 3), as well as with an annular surface 7, on the outside of which symmetrical smoke sampling jumpers 6 are arched racks 8, passing to the top 9 of the cover 4. On the inner side of the annular surface 7, a peripheral cr the surface 10, positioning the grid 12 (Fig. 1, 2), made, for example, in the form of a cylindrical wall with a diameter slightly larger than the diameter of the grid 12, restricting smoke intake openings 5 from above (Fig. 2, 3) and mating the outer side with the inner side faces smoke sampling jumpers 6 (Fig. 1, 2, 3) smoke sampling holes 5 (Fig. 2, 3), and along the outer arc of the circumference of the annular surface 7 (Fig. 1, 2, 3), a protrusion 11 is formed for directing smoke, paired with external faces of the smoke sampling bridges 6 and forming an acute angle with a peripheral circle howling surface 10. On the inner side of the base 2 (Fig. 1, 2) fasteners (for example, screws or latches) are fixed circuit board 14 with a smoke detector 13 for determining the presence of smoke in a controlled room, with a temperature-sensitive element 15 for detecting changes in air temperature, made, for example, in the form of a semiconductor thermistor with long legs , bent so that the thermistor itself is located on the axis of the smoke detector 13, with indicator 16 for visualizing the state of the detector, as well as with a switch, electronic circuit elements and a microcontroller m (Fig. not shown) by which, when connected to the detector fire alarm loop controlled operation state detector detects smoke and transmitted "fire" signal. The smoke detector 13 (Fig. 1, 2) is made, for example, by casting from black plastic in the form of a removable cylindrical cover, a side cylindrical shell formed by labyrinth plates that allow smoke to pass through, but prevent the penetration of external light and the base on which light-emitting and light-receiving modules optically isolated from each other. A grid holder 17 (Figs. 1, 2, 4, 5, 6) is coaxially embedded in the lid 4, made by molding from plastic in the form of a body of revolution formed by a cylindrical lateral surface 18 (Figs. 1, 2, 4) formed with the corresponding connection elements installation recesses 19 (Fig. 2, 4, 6), turning into an inclined guide smoke surface 20 (Fig. 1, 2, 4, 5, 6) made with the test button 22 (Fig. 1, 2, 4, 5, 6), designed for manual monitoring of the detector’s operability by closing the switch on the circuit board 14 (Fig. 1, 2), and with a hole 21 (Fig. 2, 4, 5, 6) for indicator 16 (Fig. 1, 2), and conjugated with a horizontal ring 24 (Fig. 1, 2, 5, 6) with a circular recess 25 (Fig. 1, 2, 5) whose diameter corresponds to the diameter of the mesh 12 (Fig. 1, 2). From the horizontal ring 24 (FIG. 1, 2, 5, 6), supports 26 (FIG. 1, 2, 4, 5, 6) protrude obliquely to the central axis, corresponding to smoke sampling jumpers 6 (FIG. 1, 2, 3), for example, located with them in the same vertical planes. The supports 26 (Figs. 1, 2, 4, 5, 6) support a disk 27, the diameter of which corresponds to the inner diameter of the annular surface 7 (Figs. 1, 2, 3) of the cover 4. In the disc 27 (Figs. 1, 2, 4 5, 6) a hole 28 is made (FIG. 1, 2, 5, 6), preferably axial, for the heat-sensitive element 15 (FIG. 1, 2). The guide surface 20 (Fig. 1, 2, 4, 5, 6) of the grid holder 17 is made, for example, in the form of a surface of a truncated cone, on which a button is made in the form of two radial slots 23 (Fig. 2, 4, 5, 6) test 22 (Fig. 1, 2, 4, 5, 6) to close the switch installed on the circuit board 14 (Fig. 1, 2) with a hole 21 (Fig. 2, 4, 5, 6) for indicator 16 (Fig. . 12). Smoke jumper 6 (Fig. 1, 2, 3) is made mainly in the form of vertically arranged triangular plates, the inner lower corner of which is obtuse. The plates are located in the lid 4 (Fig. 1, 2, 3) diametrically with the same pitch so that their direct inner side faces are rigidly connected to the peripheral circular surface 10 and their upper acute angle occupies the space between the peripheral circular surface 10 and the protrusion 11 for direction smoke, the outer side faces have a shape corresponding to the generatrix of the body of rotation of the cover 4, and the shape of the lower side faces corresponds to the slope of the guide surface 20 (Fig. 1, 2, 4, 5, 6). The grid 12 (Fig. 1, 2) is made, for example, of a metal wire with a diameter of 0.25 mm with a mesh size of 0.65 × 0.65 mm in the form of a cylindrical surface of a certain diameter, sealed or welded by spot welding.

The assembly of the combined fire detector 1 is as follows. A grid 12 is placed inside the lid 4 at the peripheral circular surface 10, then the grid holder 17 is inserted, aligning the recesses 19 on the cylindrical side surface 18 with the mating elements of the lid 4 and clicked against the stop of the guide surface 20 into the lower faces of the smoke sampling bridges 6 smoke sampling openings 5 fixing the grid 12 in the circular recess 25 of the horizontal ring 24, while the radial slots 23 of the test button 22 are located under two nearby smoke sampling jumpers 6, and the disk 27 closes the inner space of the annular surface 7, separating the smoke intake zone from the heat-sensitive zone. The circuit board 10 complete with a smoke detector 13, a heat-sensitive element 15, an indicator 16, a microcontroller, a switch and other electronic circuit elements are fixed on the base 2. The cover 4 is placed above the base 2 so that the response elements of the connection of the cover 4 are located above the latches 3 of the base 2 , the hole 28 in the disk 27 is above the heat-sensitive element 15, the hole for the indicator 21 is above the indicator 16, and the test button 22 is above the switch, and the cover 4 is fixed on the base 2 with translational motion, while the upper edge of the base 2 and the latches 3 abut against the cylindrical side surface 18 of the grid holder 17, and the heat-sensitive element 15 passes through the hole 28 and is located in the space under the top 9 of the cover 4 between the arcuate racks 8. Combined fire detector is ready to be installed in an appropriate outlet located at a controlled facility and electrically connected to a fire alarm system.

The declared fire detector combined is technologically advanced in production and reliable, has a large smoke area and stable smoke sensitivity when changing the size and direction of the air flow, provides free access of air to the heat-sensitive zone and efficient distribution of air flow inside the device, convenient for manual testing and maintenance in operation process.

Claims (3)

1. Combined fire detector, made in the form of a body of revolution, comprising a base and a cover detachably interconnected with smoke sampling openings and jumpers, a smoke detector, a circuit board with an indicator and a heat-sensitive element, a grid, a grid holder with holes for an indicator and a heat-sensitive element, characterized the fact that the lid is made with an annular surface, on the outside of which arcuate racks protruding to the top of the lid protrude, the inner side is made peripheral a circular surface that positions the grid and restricts smoke sampling openings from above, and a protrusion for the direction of smoke is formed along the outer arc of the circumference of the annular surface, mating with the outer edges of the smoke sampling apertures, while the grid holder embedded in the lid is made in the form of a cylindrical side surface with installation recesses turning into a guide surface made with a test button and a hole for the indicator and paired with a horizontal ring with a recess for the mesh, connected m through support corresponding dymozabornym jumpers, with the disk corresponding to the inner diameter of the annular surface of the cover, wherein an opening for the sensing element. 2. Combined fire detector according to claim 1, characterized in that the test button is made in the form of two radial slots located under nearby smoke bridges. 3. Combined fire detector according to claim 1, characterized in that the hole for the indicator is made on the test button.