CN212228736U - Optical darkroom assembly for photoelectric smoke-sensing fire detector - Google Patents
Optical darkroom assembly for photoelectric smoke-sensing fire detector Download PDFInfo
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- CN212228736U CN212228736U CN202021429594.5U CN202021429594U CN212228736U CN 212228736 U CN212228736 U CN 212228736U CN 202021429594 U CN202021429594 U CN 202021429594U CN 212228736 U CN212228736 U CN 212228736U
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Abstract
The utility model discloses an optics darkroom subassembly for photoelectric smoke sensing fire detector, including optics darkroom, dustproof fly net and optics smoke transducer, the optics darkroom includes a bottom plate, installs optics smoke transducer, shading air guide grid, shading grid and the wall that is in the light on the bottom plate. The shading air guide grids are uniformly and rotatably arrayed around the bottom plate by the axis of the bottom plate, each shading air guide grid comprises a first shading air guide grid and a second shading air guide grid which are identical in structure, and the first shading air guide grid and the second shading air guide grid are matched with each other to form an air guide channel. The first shading air guide grid consists of a first shading plate and a second shading plate, and the first shading plate and the second shading plate are connected to form a herringbone grid. The utility model discloses it is good to the smog response uniformity, and dust proof, the interference killing feature is strong.
Description
Technical Field
The utility model belongs to the technical field of fire control fire detection and warning, more specifically the utility model relates to an optics darkroom subassembly for photoelectric smoke fire detector that says so.
Background
The optical sensor is the most central device of a photoelectric smoke fire detector and responds to tiny solid or liquid smoke particles generated by combustion or pyrolysis through the principles of light scattering and refraction. Smoke particles with different particle sizes generated in the initial combustion stage of various common combustibles are relatively consistent in light forward scattering light intensity, so that most photoelectric smoke fire detectors in the market adopt a forward scattering light principle and mostly adopt a single-emission and single-reception principle. The detector of the type has the problems of poor response consistency, poor interference resistance and low sensitivity.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optics darkroom subassembly for photoelectric smoke sensing fire detector based on the forward scattering light principle, for a single-shot single-receiving type optics darkroom subassembly, has good response uniformity, and the interference killing feature is strong, advantages such as sensitivity height.
The technical scheme of the utility model is realized like this:
an optical darkroom component for a photoelectric smoke fire detector is characterized by comprising an optical darkroom, a dustproof insect-proof net and an optical smoke sensor, wherein the optical darkroom comprises a bottom plate, the bottom plate is provided with the optical smoke sensor, a shading air guide grid, a shading grid and a shading wall, wherein,
the shading air guide grids are uniformly and rotatably arrayed around the bottom plate by using the axis of the bottom plate, each shading air guide grid comprises a first shading air guide grid and a second shading air guide grid which are identical in structure, the first shading air guide grid and the second shading air guide grid are matched with each other to form an air guide channel, the air inlet angle of the air guide channel is 70-75 degrees, the air outlet angle is 40-45 degrees,
the first shading air guide grating consists of a first shading plate and a second shading plate, the second shading air guide grating consists of a third shading plate and a fourth shading plate, the included angle between the first shading plate and the second shading plate is 80-85 degrees, and the first shading plate and the second shading plate are connected to form a herringbone grating.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, be equipped with first cusp portion and second cusp portion on first shading air guide grid and the second shading air guide grid.
The utility model discloses an in this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, optics smoke transducer includes light signal receiving device and light signal emission device, light signal receiving device and light signal emission device adopt infrared light signal.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, be equipped with light signal emission device fixing base and light signal receiver fixing base on the bottom plate, be equipped with in the light signal emission device fixing base light signal emission device, be equipped with in the light signal receiver fixing base light signal receiver.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, be equipped with two and be the anti-grating that distributes between light signal emission device fixing base and the light signal receiving device fixing base, the grating includes pointed end portion and vertical portion, be 120 flaring between pointed end portion and the vertical portion.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectricity smoke sensing fire detector, the light-shading fence comprises last light-shading fence and lower light-shading fence, the light-shading fence includes first light-shading fence and second light-shading fence down, is equipped with 3 mm's cigarette passageway that advances between first light-shading fence and the second light-shading fence, still install into the test button hole in the optics darkroom, the test is installed according to the button hole the eccentric position of optics darkroom installs the test button in this test button hole.
The utility model discloses an in this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, dustproof protection against insects net still is equipped with go up the light-shading fence, it includes third light-shading fence and fourth light-shading fence to go up the light-shading fence, third light-shading fence and fourth light-shading fence respectively with first light-shading fence and second light-shading fence correspond.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, be equipped with a light-emitting window in the light signal transmitting device fixing base, be equipped with first light-blocking wall between light signal transmitting device fixing base outward flange and the first sunshade screen, first light-blocking wall highly with the lower limb of light-emitting window flushes, be equipped with into light mouth in the light signal receiving device fixing base, be equipped with second light-blocking wall between light signal receiving device fixing base outward flange and the second sunshade screen, second light-blocking wall highly with the lower limb of advancing light mouth flushes.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, first light-blocking wall and second light-blocking wall will the optics darkroom divide into first cigarette district and the second of advancing and advances the cigarette district, first cigarette district that advances is equipped with the rhombus post, the axis that the direction of shading air guide grid used the rhombus post is the symmetric distribution as the center.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, first cigarette district that advances still is equipped with third light-blocking wall, third light-blocking wall centers on first cigarette district outside of advancing distributes and with rhombus post and shading air guide grid are connected.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, be equipped with first spacing relief portion, screens portion and notch portion in optical signal transmitting device fixing base and the optical signal receiving device fixing base, optical signal transmitting device and optical signal receiving device include this somatic part, installation department and pin, this somatic part is placed on the first spacing relief portion and pass through screens portion straining, the installation department can block into simultaneously notch portion.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, the bottom of light signal emission device fixing base and light signal receiving device fixing base still is equipped with first guiding hole and second guiding hole, the guiding hole is the infundibulate, the pin includes first pin and second pin, first pin and second pin pass respectively first guiding hole and second guiding hole to install on the circuit board, the bottom of first guiding hole and second guiding hole is equipped with the counter bore, the diameter of pin is less than the internal diameter of counter bore, there is the clearance between pin and the counter bore, the clearance is through wax sealing technology processing.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, the bottom of guiding hole with clearance between the circuit board is 0.5mm-2mm, first pin and second pin stretch out the outer length of circuit board is not less than 2 mm.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, light signal receiving device fixing base still is equipped with light signal receiving device shielding layer outward, and this light signal receiving device shielding layer includes both sides face, a back and a top surface.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, dustproof insect-proof net comprises horizontal grid and vertical grid, form a plurality of cigarette meshes of advancing between horizontal grid and the vertical grid, advance the cigarette mesh and be the square, its side length size is 0.5mm-1 mm.
The utility model discloses an in this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, dustproof insect-proof net top design has 2mm deep groove.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectricity smoke detector, be equipped with the box on the bottom plate, be equipped with the pin thread on the dustproof fly net, dustproof fly net passes through buckle structure and installs on the optics darkroom.
The utility model discloses an among this kind of an optics darkroom subassembly for photoelectric smoke sensing fire detector, dustproof fly net corresponds the top of light signal emission device fixing base is equipped with light signal emission device shading enclosure, be equipped with the spacing relief portion of second in the middle of the light signal emission device shading enclosure.
Implement the utility model discloses an optics darkroom subassembly for photoelectric smoke sensing fire detector has following beneficial effect:
(1) the consistency of the response of all directions of the optical darkroom to smoke is good.
(2) The optical darkroom has the advantages of dust prevention and strong anti-interference capability.
(3) The light emitting and receiving signal devices are convenient to install, firm and reliable in fixation, and good consistency of positions of intersection regions of light paths of the emitting and receiving devices is guaranteed, so that the consistency of response sensitivity of the optical sensor to smoke is good.
(4) The pins of the optical signal transmitting and receiving devices are respectively fixed in funnel-shaped guide holes designed on the optical darkroom, and a gap is designed between the bottom of each hole and the circuit board, so that a wax sealing process is adopted, and the false alarm fault of the optical signal receiving device caused by moisture is avoided.
(5) Due to the unique design of the shading and air guiding grid, smoke has an accumulation effect in a darkroom, the timeliness of the sensor for detecting the smoke is enhanced, and the sensitivity of response to smoke particles is enhanced.
Drawings
Fig. 1 is a schematic structural view of an optical darkroom assembly for an optical smoke fire detector according to the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic view of the optical darkroom of FIG. 2;
FIG. 4 is another schematic view of the orientation of FIG. 3;
FIG. 5 is an enlarged partial schematic view of FIG. 4, primarily illustrating the light-blocking air guide grille structure;
FIG. 6 is a schematic view of the mounting structure of the pins and the air holes in FIG. 2;
FIG. 7 is an enlarged partial schematic view of FIG. 6;
FIG. 8 is a schematic view of the dust-proof and insect-proof net of FIG. 1;
fig. 9 is another structural view of fig. 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
The optical darkroom assembly for photoelectric smoke fire detector of the present invention as shown in fig. 1 to 9 comprises an optical darkroom 10, a dustproof insect-proof net 20 and an optical smoke sensor, wherein the optical darkroom 10 comprises a bottom plate 11, and the bottom plate 11 is provided with the optical smoke sensor, a shading air guide grid 40, a shading grid 50 and a light blocking wall 60.
The shading air guide grids 40 are uniformly and rotatably arrayed around the bottom plate 11 by the axis of the bottom plate 11, each shading air guide grid 40 comprises a first shading air guide grid 41 and a second shading air guide grid 42 which are identical in structure, the first shading air guide grid 41 and the second shading air guide grid 42 are matched with each other to form an air guide channel, the air inlet angle of the air guide channel is 74 degrees, and the air outlet angle of the air guide channel is 41 degrees.
The first shading air guide grille 41 is composed of a first shading plate 411 and a second shading plate 412, the second shading air guide grille 42 is composed of a third shading plate 421 and a fourth shading plate 422, the included angle between the first shading plate 411 and the second shading plate 412 is 80 degrees, and the first shading plate 411 and the second shading plate 412 are connected to form a herringbone grille.
The design of the shading air guide grating 41 has an absorption effect on infrared light emitted by an infrared light signal emitting device, namely, the herringbone grating can emit the infrared light emitted by the light signal emitting device into corners and plays a role of trapping light, so that when no smoke particles exist in an optical darkroom, the light signal receiving device cannot receive light signals or can only receive weak signals reflected twice, three times or more times.
The first light-shielding air guide grid 41 and the second light-shielding air guide grid 42 are provided with a first tip part 43 and a second tip part 44, and the tip parts can reduce the obstruction to the air flow, so that smoke particles can quickly enter the inside of the labyrinth, and the sensitivity of the optical smoke sensor is improved.
The optical smoke sensor comprises an optical signal receiving device 31 and an optical signal emitting device 32, wherein the optical signal receiving device 31 and the optical signal emitting device 32 adopt infrared optical signals, so that the optical smoke sensor is high in sensitivity and quick in response.
The bottom plate 11 is provided with an optical signal emitting device fixing seat 33 and an optical signal receiving device fixing seat 34, an optical signal emitting device 32 is arranged in the optical signal emitting device fixing seat 33, and an optical signal receiving device 31 is arranged in the optical signal receiving device fixing seat 34.
Two light-shielding barriers 50 which are distributed oppositely are arranged between the optical signal transmitting device fixing seat 33 and the optical signal receiving device fixing seat 34, each light-shielding barrier 50 comprises a tip part and a vertical part, and 120-degree flaring is formed between the tip part and the vertical part. The light-shielding grid 50 comprises an upper light-shielding grid 36 and a lower light-shielding grid 37, the lower light-shielding grid 37 comprises a first light-shielding grid 371 and a second light-shielding grid 372, a 3mm smoke inlet channel is arranged between the first light-shielding grid 371 and the second light-shielding grid 372, a test key hole 12 is further installed in the optical darkroom 10, the test key hole 12 is installed at the eccentric position of the optical darkroom 10, a test key is installed in the test key hole 12, and after the test key is pressed, smoke particles on one side of the test key can directly enter a detection area through the smoke inlet channel. Whether the optical smoke sensor works normally is detected quickly.
The dustproof and insect-proof net 20 is further provided with an upper light-shielding grid 36, the upper light-shielding grid 36 comprises a third light-shielding grid 361 and a fourth light-shielding grid 362, the third light-shielding grid 361 and the fourth light-shielding grid 362 respectively correspond to the first light-shielding grid 371 and the second light-shielding grid 372, namely after the dustproof and insect-proof net 20 and the optical darkroom 10 are installed, the lower bottom surface of the third light-shielding grid 361 contacts with the upper top surface of the first light-shielding grid 371, and the lower bottom surface of the fourth light-shielding grid 362 contacts with the upper top surface of the second light-shielding grid 372, so that a relatively closed wall body is formed. The light-shielding barrier is used for blocking the part of light emitted by the optical signal emitting device 31 and capable of directly entering the optical signal receiving device 32, so that when no smoke particles enter the detection area, the optical signal receiving device 32 cannot receive the light emitted by the optical signal emitting device 31, only when the smoke particles enter the detection area, the light path of the light emitted by the optical signal emitting device 31 is changed by using the scattering principle of light encountering particles, part of light is emitted to the optical signal receiving device 32 after being scattered, and the optical signal receiving device 32 judges whether the light is a fire alarm according to the intensity of the received signal.
Be equipped with a light-emitting port in the optical signal transmitting device fixing base 33, be equipped with first light-blocking wall 38 between optical signal transmitting device fixing base 33 outward flange and the first shading grating 371, the height of first light-blocking wall 38 flushes with the lower limb of light-emitting port, be equipped with into light inlet in the optical signal receiving device fixing base 34, be equipped with second light-blocking wall 39 between optical signal receiving device fixing base 34 outward flange and the second shading grating 372, the height that second light-blocking wall 39 flushes with the lower limb of light inlet. A light blocking wall is arranged between the optical signal transmitting device fixing seat 33 and the optical signal receiving device fixing seat 34, and the light blocking wall can block the light which is emitted by the optical signal transmitting device 32 and is larger than or equal to +/-10 degrees of the center of a light outlet of the optical signal transmitting device, so that the light of the light blocking wall can be prevented from entering the area where the detection area is located, the interference of the light blocking wall on the optical signal receiving device 31 can be avoided, the signal value received by the optical signal receiving device when the optical sensor has no smoke particles can be effectively reduced, and the background noise can be reduced.
The first light blocking wall 38 and the second light blocking wall 39 divide the optical darkroom into a first smoke inlet area 13 and a second smoke inlet area 14, the first smoke inlet area 13 is provided with a diamond column 131, and the light blocking air guide gratings 40 are symmetrically distributed by taking the axis of the diamond column 131 as the center, so that external light can be reflected for multiple times between the light blocking air guide gratings 40 symmetrically distributed on two sides of the first smoke inlet area 13 and gradually absorbed. The first smoke inlet area 13 is further provided with a third light blocking wall 132, and the third light blocking wall 132 is distributed around the outer side of the first smoke inlet area 13 and is connected with the diamond-shaped column 131 and the shading air guide grille 40. The interference of the external light to the detection area 133 in the first smoke inlet area 13 is effectively reduced, and the background noise is further reduced.
The optical signal transmitting device fixing seat 33 and the optical signal receiving device fixing seat 34 are internally provided with a first limit convex-concave part 331, a clamping part 332 and a notch part 333, the optical signal transmitting device 32 and the optical signal receiving device 31 comprise a body part 311, an installation part 312 and pins 313, the body part 311 is placed on the first limit convex-concave part 331 and fastened through the clamping part 332, meanwhile, the installation part 312 can be clamped into the notch part 333, the installation is convenient, the fixation is firm, the consistency of the positions of the intersection regions of the light paths of the transmitting and receiving devices is good, and the consistency of the response sensitivity of the optical sensor to smoke is further ensured.
The bottoms of the optical signal transmitting device fixing seat 33 and the optical signal receiving device fixing seat 34 are further provided with guide holes 341, the guide holes 341 comprise a first guide hole 334 and a second guide hole 335, the guide holes 341 are funnel-shaped, the pins 313 comprise a first pin 336 and a second pin 337, the first pin 336 and the second pin 337 respectively pass through the first guide hole 334 and the second guide hole 335 and are mounted on the circuit board 338, the bottoms of the first guide hole 334 and the second guide hole 335 are provided with counter bores 339, the diameter of the pin 313 is smaller than the inner diameter of the counter bore 339, gaps exist between the pins 313 and the counter bores 339, and the gaps are processed through a wax sealing process. The false alarm fault of the optical smoke sensor caused by a humid environment is avoided.
The gap between the bottom of the guide hole 341 and the circuit board 338 is 0.5mm-2mm, the length of the first pin 336 and the second pin 337 extending out of the circuit board 338 is not less than 2mm, it is ensured that the distance between the bottom of the guide hole 341 and the circuit board 338 is adjustable, and when the distance between the guide hole 341 and the circuit board 338 is increased, that is, the length of the two pins 313 on the circuit board 338 is increased, so that the impedance between the two pins 313 is increased, and the sensitivity of the optical smoke sensor is further improved.
The optical signal receiving device fixing base 34 is further provided with an optical signal receiving device shielding layer 342, the optical signal receiving device shielding layer 342 includes two side surfaces 343, a back surface 344 and a top surface 345, and the optical signal receiving device shielding layer 342 shields the light on the side surfaces, the back surface and the upper surface of the optical signal receiving device fixing base 34, so as to prevent external light from interfering with the optical signal receiving device 31 and generating false alarm.
Be equipped with breach groove 21 on dustproof fly net 20, light signal receiving device shielding layer 342 size and breach groove 21 phase-match shield light signal receiving device fixing base 34 alone through light signal receiving device shielding layer 342, avoid when dismantling dustproof fly net 20 deashing, in the dust got into light signal receiving device fixing base 34, influence the testing result.
The dustproof and insect-proof net 20 consists of transverse grid bars 22 and vertical grid bars 23, a plurality of smoke inlet mesh holes 24 are formed between the transverse grid bars 22 and the vertical grid bars 23, the smoke inlet mesh holes 24 are square, and the side length of the smoke inlet mesh holes is 0.5mm-1 mm. Guarantee that smog particle can get into in the optics darkroom through advancing the cigarette mesh, the aperture plays the interception effect to the insect simultaneously, avoids the insect to get into the darkroom and arouses detector wrong report alert.
Preferably, the top of the dustproof and insect-proof net 20 is designed with a 2mm deep groove 25, which is a dust settling area, so that dust is far away from the detection area, and false alarm caused by interference of dust on the optical signal receiving device is avoided.
Be equipped with box 111 on the bottom plate 11, be equipped with pin thread 26 on the dustproof fly net 20, dustproof fly net 20 passes through buckle structure and installs on optics darkroom 10, and easy dismounting is convenient for wash dustproof fly net 20.
The dustproof insect-proof net 20 is provided with an optical signal emitter shading enclosing wall 27 above the optical signal emitter fixing seat 33, so that the background noise caused by light leakage is prevented from being too high. The middle of the light shielding enclosing wall 27 of the optical signal emitting device is provided with a second limiting concave-convex part 271, and the second limiting concave-convex part 271 is matched with the first limiting concave-convex part 331 and the clamping part 332 to lock all directions of the optical signal emitting device 32, so that the fixing is firm, and the device is prevented from shifting due to vibration and impact.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical darkroom component for a photoelectric smoke fire detector is characterized by comprising an optical darkroom, a dustproof insect-proof net and an optical smoke sensor, wherein the optical darkroom comprises a bottom plate, the bottom plate is provided with the optical smoke sensor, a shading air guide grid, a shading grid and a shading wall, wherein,
the shading air guide grids are uniformly and rotatably arrayed around the bottom plate by using the axis of the bottom plate, each shading air guide grid comprises a first shading air guide grid and a second shading air guide grid which are identical in structure, the first shading air guide grid and the second shading air guide grid are matched with each other to form an air guide channel, the air inlet angle of the air guide channel is 70-75 degrees, the air outlet angle is 40-45 degrees,
the first shading air guide grating consists of a first shading plate and a second shading plate, the second shading air guide grating consists of a third shading plate and a fourth shading plate, the included angle between the first shading plate and the second shading plate is 80-85 degrees, and the first shading plate and the second shading plate are connected to form a herringbone grating.
2. The optical darkroom assembly of claim 1, wherein the first and second light blocking air guide gratings have first and second pointed portions.
3. The optical darkroom assembly of claim 2, wherein the optical smoke sensor comprises a light signal receiving device and a light signal emitting device, the light signal receiving device and the light signal emitting device using infrared light signals.
4. The optical darkroom assembly of claim 3, wherein the bottom plate is provided with a light signal emitting device fixing seat and a light signal receiving device fixing seat, the light signal emitting device is arranged in the light signal emitting device fixing seat, and the light signal receiving device is arranged in the light signal receiving device fixing seat.
5. The optical darkroom assembly of claim 4, wherein two light barriers are oppositely disposed between the optical signal emitting device holder and the optical signal receiving device holder, the light barriers comprise a tip portion and a vertical portion, and the tip portion and the vertical portion have a 120 ° flaring therebetween.
6. The optical darkroom assembly of claim 4, wherein the light-shielding grating is composed of a first light-shielding grating and a second light-shielding grating, a 3mm smoke inlet channel is arranged between the first light-shielding grating and the second light-shielding grating, a test key hole is further arranged in the optical darkroom, the test key hole is arranged at an eccentric position of the optical darkroom, and a test key is arranged in the test key hole.
7. The optical darkroom assembly of claim 4, wherein a light outlet is arranged in the optical signal emitting device fixing seat, a first light blocking wall is arranged between the outer edge of the optical signal emitting device fixing seat and the first light blocking grating, the height of the first light blocking wall is flush with the lower edge of the light outlet, a light inlet is arranged in the optical signal receiving device fixing seat, a second light blocking wall is arranged between the outer edge of the optical signal receiving device fixing seat and the second light blocking grating, and the height of the second light blocking wall is flush with the lower edge of the light inlet.
8. The optical darkroom assembly of claim 7, wherein the first and second light-blocking walls divide the optical darkroom into a first smoke-feeding region and a second smoke-feeding region, the first smoke-feeding region is provided with a diamond-shaped column, and the light-blocking air guide grids are symmetrically arranged around the axis of the diamond-shaped column.
9. The optical darkroom assembly of claim 8, wherein a first limit protrusion, a clamping portion and a slot portion are arranged in the optical signal emitting device fixing seat and the optical signal receiving device fixing seat, the optical signal emitting device and the optical signal receiving device comprise a body portion, a mounting portion and a pin, the body portion is placed on the first limit protrusion and fastened through the clamping portion, and the mounting portion can be clamped into the slot portion.
10. The optical darkroom assembly of claim 9, wherein the bottom of the optical signal emitting device holder and the bottom of the optical signal receiving device holder are further provided with a first guiding hole and a second guiding hole, the guiding holes are funnel-shaped, the pins comprise a first pin and a second pin, the first pin and the second pin respectively pass through the first guiding hole and the second guiding hole and are mounted on the circuit board, the bottom of the first guiding hole and the bottom of the second guiding hole are provided with counter bores, the diameter of the pins is smaller than the inner diameter of the counter bores, gaps exist between the pins and the counter bores, and the gaps are processed by wax sealing technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021429594.5U CN212228736U (en) | 2020-07-20 | 2020-07-20 | Optical darkroom assembly for photoelectric smoke-sensing fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021429594.5U CN212228736U (en) | 2020-07-20 | 2020-07-20 | Optical darkroom assembly for photoelectric smoke-sensing fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212228736U true CN212228736U (en) | 2020-12-25 |
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ID=73912020
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021429594.5U Expired - Fee Related CN212228736U (en) | 2020-07-20 | 2020-07-20 | Optical darkroom assembly for photoelectric smoke-sensing fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212228736U (en) |
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2020
- 2020-07-20 CN CN202021429594.5U patent/CN212228736U/en not_active Expired - Fee Related
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Granted publication date: 20201225 Termination date: 20210720 |