CN202995949U - Fire detector - Google Patents
Fire detector Download PDFInfo
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- CN202995949U CN202995949U CN2012207473587U CN201220747358U CN202995949U CN 202995949 U CN202995949 U CN 202995949U CN 2012207473587 U CN2012207473587 U CN 2012207473587U CN 201220747358 U CN201220747358 U CN 201220747358U CN 202995949 U CN202995949 U CN 202995949U
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- shielding
- fire detector
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- detector
- pedestal
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Abstract
The utility model relates to a fire detector, comprising a fire detector housing, a fire detector pedestal, and a shielding structure, wherein the shielding structure comprises a shielding pedestal and a shielding upper cover. The shielding pedestal is fixedly installed on the detector pedestal. The shielding upper cover is disposed inside the fire detector housing, and is fixedly connected with the shielding pedestal. A metal shielding structure is used to protect the fire detector under strong electromagnetic radiation environment, coupling of electromagnetic radiation on electronic circuits in the detector is effectively reduced, interference of electromagnetic radiation is reduced, and normal operation of the detector is guaranteed. Comparing the metal shielding structure with passive protection, protection of interference signal sensing elements effectively reduces influence of the electromagnetic radiation on the internal electronic circuits, thereby reducing area of a PCB plate, reducing volume of the detector, and reducing cost.
Description
Technical field
The utility model relates to the wind power technology field, particularly relates to a kind of fire detector.
Background technology
The combustible material kind of blower fan inside is many, and it is distributed in the position that impeller, cabin and pylon etc. are equipped with High Value Unit.At present, domestic wind energy turbine set does not have or the linkage type fire fighting equipment seldom is installed, and is only to put two tool dry-chemical extinguishers in fan engine room mostly.After the blower fan long-time running, due to high-altitude vibration, the reason such as oil leak, electrical equipment are aging, easily breaking out of fire causes the tremendous economic loss.
Blower fan internal electromagnetic environment is very complicated, harsh, the Conduction Interference on power supply, signal wire, also exists a large amount of spacing electromagnetic radiations to disturb.Conduction type disturbs and can suppress by power supply, entry signal are processed effectively.space radiation is disturbed, moment detector is seldom processed, only depend on the performance reply of device own, or process with following methods, see also shown in Figure 1, in circuit, spacing electromagnetic radiation can be coupled on signal wire or power lead, for fear of work impacts to the electromagnetic susceptibility device, add filtering device at electromagnetic susceptibility device input port, such as magnetic bead, electric capacity etc., this method can be not high to complexity product, effectively protect under relatively simple electromagnetic environment, but for fire detector, especially the fire detector that uses in aerogenerator, effect is very limited.Existing conventional fire detector in blower fan inside owing to being subject to electromagnetic interference (EMI), normally stable operation, can't guarantee timely, the correct detection of the blower fan inside condition of a fire and report, might produce the wrong report fire alarm, fail to report fire alarm, the situation that even can't work.
The major defect of conventional fire detector is:
1. being difficult to which device of judgement or port need to increase protection, can only rule of thumb add with test result, if test result is different from site environment, the protection device of interpolation not only causes waste, and possibly can't guarantee normal operation of sensor;
2. the operating frequency range of protection device self is certain, to a certain extent the time, might cause protection device to lose efficacy when the electromagnetic environment complexity, and sensor can't work;
3. add too much protection device, can waste the pcb board area, increase device cost.
This shows, traditional fire detector exists obvious deficiency and defective in structure, use, demand further improvement urgently, therefore how to found and a kind ofly can effectively reduce the coupling of electromagnetic radiation on the detector internal electronics, reduce the fire detector of electromagnetic interference, one of real important topic that belongs to current research and development.
The utility model content
The purpose of this utility model is to provide a kind of fire detector, make it can solve the problem that the blower fan electromagnetic radiation causes fire detector to work, effectively reduce the coupling of electromagnetic radiation on the detector internal electronics, reduce electromagnetic interference, the normal operation of assurance detector, thus overcome the deficiencies in the prior art.
For solving the problems of the technologies described above, a kind of fire detector of the utility model, comprise fire detector shell, fire detector base, shielding construction, wherein, shielding construction comprises shielding base and shielding upper cover: described shielding base is fixedly mounted on detector base, the shielding upper cover is arranged on the fire detector enclosure, and is fixedly connected with the shielding base.
As further improvement of the utility model, described shielding construction inside is provided with pcb board.
GND network on described pcb board is connected by spring with the shielding base.
Porose crack structure is set on described shielding construction.
Described shielding construction adopts ferromagnetic.
Described shielding construction adopts stainless steel.
Described shielding upper cover and the connected mode of shielding between base be by mould clamping head be connected, riveted joint or bolt connect.
Between described fire detector shell and fire detector base, and be connected by screw between shielding base and fire detector base.
After adopting above design, the utility model has following useful technique effect compared with the prior art:
1, the utility model has adopted increases the metallic shield structure in shell; under the strong electromagnetic radiation environment, fire detector is protected; effectively reduce the coupling of electromagnetic radiation on the detector internal electronics, reduced the interference of electromagnetic radiation, guaranteed the normal operation of fire detector.
2, metallic shield structure of the present utility model is compared with passive protection, has more effectively reduced the impact of electromagnetic radiation on internal electronics, has dwindled the area of pcb board, has reduced the detector volume, has reduced cost.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Above-mentioned is only the general introduction of technical solutions of the utility model, and for can clearer understanding the utility model, the utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the Method And Principle figure that the conventional fire detector prevents electromagnetic interference.
Fig. 2 is the decomposition texture schematic diagram of the utility model fire detector.
Embodiment
See also shown in Figure 2ly, a kind of fire detector of the utility model comprises fire detector shell 1, fire detector base 5 and shielding construction, and wherein, shielding construction comprises shielding base 4 and shielding upper cover 2.Shielding base 4 is fixedly mounted on fire detector base 5, and shielding upper cover 2 is arranged on fire detector shell 1 inside, and is fixedly connected with shielding base 4.
Furthermore, shielding construction of the present utility model adopts ferromagnetic, preferred stainless steel, shielding upper cover 2 and connected mode between shielding base 4 be by mould clamping head be connected, riveted joint or bolt connection.Whole shielding construction is arranged on the fire detector enclosure.
In addition, shielding construction inside also is provided with pcb board 3, and the GND network on pcb board 3 is connected by spring with shielding base 4.Shielding construction needs leakage path, otherwise the meeting stored charge causes more serious interference to electronic circuit.The utility model is to be provided with a segment distance between pcb board 3 and shielding base 4 with GND network on pcb board and shielding construction connected mode, reserve the pad of a GND network by the bottom at pcb board, spring of welding on this pad, make the length of spring greater than distance between pcb board and shielding base, after pcb board installs, spring produces deformation, and base is reliable and stable is connected with shielding.
Specifically, shielding base 4 can be fixed on fire detector base 5 by mould clamping head, and pcb board 3 is screwed on fire detector base 5, and pcb board 3 reliably is connected by the spring that welds on pcb board 3 bottom surface pads with shielding between base 4.Fire detector shell 1 is connected with fire detector base 5 by screw.
Better, also porose crack structure can be set on shielding construction of the present utility model.The utility model adopts the principle of shielding, and according to shielding theory, when gap lengths is electromagnetic wavelength one half, electromagnetic wave begins decay.When wave frequency was 1GHz, wavelength was 300mm, namely when maximum length is stitched in the hole less than 150mm, disturbed to begin decay; When hole seam during less than 37.5mm, attenuation is original 1/4th; When hole seam during less than 15mm, attenuation 20dB namely decays to original 1/10th.With the whole of electronic product or all be placed in complete closed metal enclosure, can effectively avoid the external radiation emission to be coupled on the interiors of products electronic circuit.Screen layer is the obstacle that electromagnetic field is propagated, and the definition shield effectiveness incides the ratio of electromagnetic field in the product electronic circuit when unshielded for having, and ideally, shield effectiveness can reach 100dB at least.During concrete the use, can not accomplish to seal fully, suitable as long as the hole seams meter, interference can be reduced to tolerance interval.Therefore, the utility model increases shielding construction and can guarantee fire detector steady operation under electromagnetic interference (EMI) for the singularity of wind-powered electricity generation industry and the complicacy of internal electromagnetic signal.
The above; it is only preferred embodiment of the present utility model; be not that the utility model is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection domain of the present utility model.
Claims (8)
1. a fire detector, is characterized in that comprising fire detector shell, fire detector base, shielding construction, and wherein, shielding construction comprises shielding base and shielding upper cover:
Described shielding base is fixedly mounted on detector base, and the shielding upper cover is arranged on the fire detector enclosure, and is fixedly connected with the shielding base.
2. fire detector according to claim 1 is characterized in that:
Described shielding construction inside is provided with pcb board.
3. fire detector according to claim 2 is characterized in that:
GND network on described pcb board is connected by spring with the shielding base.
4. fire detector according to claim 1 is characterized in that:
Porose crack structure is set on described shielding construction.
5. fire detector according to claim 1 is characterized in that:
Described shielding construction adopts ferromagnetic.
6. fire detector according to claim 1 is characterized in that:
Described shielding construction adopts stainless steel.
7. fire detector according to claim 1 is characterized in that:
Described shielding upper cover and the connected mode of shielding between base be by mould clamping head be connected, riveted joint or bolt connect.
8. fire detector according to claim 1 is characterized in that:
Between described fire detector shell and fire detector base, and be connected by screw between shielding base and fire detector base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207473587U CN202995949U (en) | 2012-12-31 | 2012-12-31 | Fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207473587U CN202995949U (en) | 2012-12-31 | 2012-12-31 | Fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202995949U true CN202995949U (en) | 2013-06-12 |
Family
ID=48567097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207473587U Expired - Lifetime CN202995949U (en) | 2012-12-31 | 2012-12-31 | Fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202995949U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376455A (en) * | 2018-02-12 | 2018-08-07 | 江苏聚强电子科技有限公司 | A kind of wire type fire detector and preparation method thereof |
-
2012
- 2012-12-31 CN CN2012207473587U patent/CN202995949U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376455A (en) * | 2018-02-12 | 2018-08-07 | 江苏聚强电子科技有限公司 | A kind of wire type fire detector and preparation method thereof |
| CN108376455B (en) * | 2018-02-12 | 2021-06-01 | 江苏聚强电子科技有限公司 | Line type fire detector and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |
|
| CX01 | Expiry of patent term |