CN103334793A - Underground audio broadcasting alarming device - Google Patents
Underground audio broadcasting alarming device Download PDFInfo
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- CN103334793A CN103334793A CN2013102926861A CN201310292686A CN103334793A CN 103334793 A CN103334793 A CN 103334793A CN 2013102926861 A CN2013102926861 A CN 2013102926861A CN 201310292686 A CN201310292686 A CN 201310292686A CN 103334793 A CN103334793 A CN 103334793A
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- audio broadcasting
- coupling filter
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Abstract
The invention discloses an underground audio broadcasting alarming device. The underground audio broadcasting alarming device comprises a voice frequency amplifier used as a signal emitter, a grounding device and a voice frequency receiving device, the output end of the voice frequency amplifier is connected with the input end of a coupling filter, and the output end of the coupling filter is connected with a transmitting antenna. According to the underground audio broadcasting alarming device, the voice frequency amplifier for voice frequency signals is used for sending alarming signals, the protection wire of an underground power supply system is used as the transmitting antenna, and the influence of grounding current to the voice frequency amplifier when a coupling filter isolation power supply system fails is reduced, the voice frequency receiving device receives voice frequency alarming signals, and underground wireless alarming is achieved. The underground audio broadcasting alarming device has the advantages that voice frequency signal emission is adopted and emission equipment is simple; the protection wire in the underground power supply system is used as the transmitting antenna, on one hand coverage can reach every electrical device, and on the other hand no antenna needs to be arranged. The underground audio broadcasting alarming device is good in performance, high in reliability, simple in structure and low in cost.
Description
Technical field
The present invention relates to a kind of radio alarming device, particularly relate to a kind of realization down-hole audio broadcasting warning device.
Background technology
At present, known downhole wireless warning device, short, the signal straightline propagation of the signal transmission distance that caused by conditions such as rock shielding, tunnel bending, influence such as signal attenuation acutely reaches antenna size, arrange, all adopt long wave, medium wave, shortwave, microwave frequency emission, or adopt radiation patterns such as many antennas, leaky cable, these radiation patterns are influenced by geographical position, geological conditions, roadway shape etc., be difficult to realize accurately and reliably or emission effectively, when mine disaster takes place, the personnel in the pit can not receive alarm signal in time, effectively, and then causes casualties.
The end of the eighties, China has introduced the wireless leaky feeder communication technology that is used for the down-hole, this technology, need launch modulated high-frequency signal with leaky cable, must lay special-purpose leaky cable in the down-hole specially as transmitting antenna, and leaky cable must constantly change lay length with the carrying out of digging, and investment is big, and expends a large amount of leaky cable material and artificial.And because leaked transmit relates to is high-frequency signal transmission, need special modulating equipment and receiving equipment.
Summary of the invention
Prior art radio alarming device signal transmission distance is short in order to solve, signal straightline propagation; signal attenuation is violent; multiple radiation pattern all is difficult to realize; and it is big as the transmitting antenna investment with leaky cable; engineering quantity is big, the high deficiency of cost of production; it is transmitting antenna that a kind of protective wire with underground power supply system is provided, the down-hole audio broadcasting warning device that transmitter is simple, reliability is high, cost of production is low.
Realize above-mentioned purpose by the following technical solutions:
A kind of down-hole audio broadcasting warning device, comprise the audio frequency enlarger as signal transmitter, ground device, apparatus for receiving audio, the output of described audio frequency enlarger is connected with the input of coupling filter, and the output of coupling filter is connected with transmitting antenna.
Further, the audio frequency enlarger arranges two lead-out terminals, a lead-out terminal is connected with the input terminal of coupling filter, another lead-out terminal links to each other with the lead-out terminal of coupling filter, another input terminal of coupling filter, lead-out terminal are connected in series to respectively in the transmitting antenna loop, and ground device connects and composes the loop with transmitting antenna respectively.
Further, described transmitting antenna is the protective wire of underground power supply system.
Further, described coupling filter is connected in parallel by the winding of transformer and electric capacity and constitutes resonance circuit, and resonant frequency is 50Hz.
Further, the audiorange 100Hz-12kHz of described audio frequency enlarger.
Further, described apparatus for receiving audio adopts earphone.
Further, described earphone and audio signal wireless connections.
Adopt technique scheme; compared with prior art; the present invention adopts audio signal to launch alarm signal with the audio frequency enlarger; utilize protective wire in the underground power supply system as transmitting antenna; earth current was to the influence of audio frequency enlarger when coupling filter was isolated the electric power system fault; apparatus for receiving audio receives audio alarming signal, realizes the radio alarming of down-hole.Its significant effect is: this device adopts the audio signal emission, and transmitter is simple; Protective wire in the employing underground power supply system is as transmitting antenna, and coverage can reach every electric fixtures on the one hand, need not on the other hand to erect a television antenna.Device performance is good, the reliability height, and simple in structure, cost is low.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the coupling filter circuit diagram.
Among the figure, audio frequency enlarger 1, coupling filter 2, ground device 3,6, transmitting antenna 4, apparatus for receiving audio 5.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Present embodiment is a kind of down-hole audio broadcasting warning device for the mine, by audio frequency enlarger 1, and coupling filter 2, ground device 3,6, transmitting antenna 4, apparatus for receiving audio 5 is formed.Its structure is seen Fig. 1, and audio frequency enlarger 1 hinders the formula enlarger surely for common 100W, and the PA-100U100W level pressure that present embodiment selects for use new Shinco Electron Group Co., Ltd to produce hinders enlarger surely, and the audio frequency scope of application of audio frequency enlarger 1 is 100Hz-12kHz.Audio frequency enlarger 1 has two lead-out terminals, and a lead-out terminal is connected with the input terminal a of coupling filter 2, and another lead-out terminal is connected with the lead-out terminal b of coupling filter 2.The effect of audio frequency enlarger 1 is: audio signal is provided.
In Fig. 2, coupling filter 2 is composed in parallel by winding of transformer a and electric capacity b and constitutes resonance circuit.Consider that Transformer Winding has resistance, reality is R-L C resonance in parallel.Parameter is set to inductance H=0.35H, capacitor C=29 μ F, resistance R=0.1 Ω, resonant frequency
=50Hz is during resonance
, quality factor
=54908.9.When the electric power system fault, power frequency is 50Hz on the electric power system protective wire 4, and coupling filter 2 is 120689.7 Ω to the resistance value of this frequency current, and is very big, approximate can think open circuit; And for audio signal (audiorange 100Hz-12kHz), because quality factor q is very big, so the resistance value for the current signal of this frequency range is very little, realize the effect of coupling filtering, namely audio signal (audiorange 100Hz-12kHz) can more smooth and easyly be passed through, and the 50Hz AC signal is produced blocking effect.The effect of coupling filter 2: blocking-up 50Hz exchanges, and audio signal (audiorange 100Hz-12kHz) can more smooth and easyly be passed through, and has the impedance matching effect simultaneously concurrently.
The impedance matching effect of transformer between the Transformer Winding initial line in the coupling filter 2, total ground resistance (be load resistance, safety standard is stipulated smaller or equal to 2 Ω) of transmitting antenna 4 can be transformed into the numerical value of deciding 1 requirement of resistance formula audio frequency enlarger by the no-load voltage ratio of adjusting transformer.
The electric power system ground device adopts multipoint earthing, and for example ground device 3 and ground device 6 and the earth constitute the loop.Ground device 3 one ends connect with the transmitting antenna 4 that is connected with coupling filter lead-out terminal d, other end ground connection, ground device 6 one ends connect with the transmitting antenna 4 that is connected with coupling filter input terminal c, other end ground connection, and ground device 3 and ground device 6 constitute path by the earth.Ground device 3 and ground device 6 effects: constitute the loop with the earth, play the transmitting antenna effect.
Apparatus for receiving audio 5 receives earphone for ordinary audio, eastern sub-board/DX-820 earphone that present embodiment adopts Liyang company of equipment Co., Ltd of Dongfang Electronics to produce, be installed on the safety helmet after being reequiped, the power supply of employing mine lamp power, with the audio signal wireless connections, receive 1 that send by the audio frequency enlarger, by the audio alarming signal of transmitting antenna 4 emissions.Apparatus for receiving audio 5 effects: receive the audio alarm wire size and amplify the generation alarm sound.
Operating principle of the present invention:
The present invention adopts protection (PE) line of underground power supply system as transmitting antenna 4, and protective wire in use must be connected to every consumer, so need not to consider to change antenna lay length problem.And according to safety code, protective wire is all-in resistance≤2 Ω over the ground, make the output resistance coupling simple possible of audio frequency enlarger 1.The 50Hz alternating current has adopted coupling filter 2 to the influence of audio frequency enlarger 1 when eliminating the electric power system fault.
Transmitting antenna 4 is connected on the output of audio frequency enlarger as the load (substituting loudspeaker) of audio frequency enlarger 1 by coupling filter 2.The alarm signal of the output of coupling filter 2 forms electric current by protection (PE) line 4 as the transmitting antenna electric power system; this electric current formed electromagnetic field is to transmitting antenna 4 surrounding space transmitting audio frequency alarm signals; cover each zone of 4 processes of transmitting antenna, the audio alarming signal of described transmitting antenna 4 emissions is realized the radio alarming of down-hole by each apparatus for receiving audio 5 reception in each zone.
The audio alarming signal that audio frequency enlarger 1 sends is transported on the electric power system protective wire as transmitting antenna 4 by coupling filter 2.The electric power system protective wire is received on the electric installation of each equipment of down-hole, plays the safeguard protection effect, and is just often not charged, and earth current (50Hz) is arranged during fault, but voltage-to-ground can not surpass the special lower security voltage of national regulation, must be below 50V.Audio alarm system is not worked at ordinary times, only just reports to the police when mine disaster takes place, and according to the 100W enlarger, output resistance 8 Ω calculate, and the electric power system protective wire voltage-to-ground that audio signal during warning (audiorange 100Hz-12kHz) causes is 28.3V(to the maximum
), also meet safety standard.
The effect of coupling filter 2 of the present invention is:
1. parallel resonance frequency is 50Hz, and namely coupling filter 2 presents very large impedance when this frequency, and when electric power system generation leak current fault, the 50Hz alternating current on the transmitting antenna 4 can not exert an influence to audio frequency enlarger 1; And be disresonance for audio alarming signal (100-12kHz), audio alarming signal can arrive transmitting antenna 4 through less impedance.
2. play the impedance matching effect, surely the load impedance that hinders formula audio frequency enlarger 1 is 8 Ω, and according to the electric power system code requirement, total ground resistance of transmitting antenna 4 is inaccurate greater than 2 Ω, the impedance matching effect of transformer between the transformer initial line in the coupling filter 2 can be transformed into total ground resistance (being load resistance) of transmitting antenna 4 numerical value of deciding 1 requirement of resistance formula audio frequency enlarger by the no-load voltage ratio of adjusting transformer.
Apparatus for receiving audio 5 receives the audio signal that transmitting antenna 4 takes place, by apparatus for receiving audio 5(earphone) sounding realizes that broadcasting reports to the police.
Above-described embodiment has only been expressed one embodiment of the present invention, but can not therefore be interpreted as limitation of the scope of the invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. a down-hole audio broadcasting warning device comprises the audio frequency enlarger as signal transmitter, ground device, apparatus for receiving audio, it is characterized in that the output of described audio frequency enlarger is connected with the input of coupling filter, the output of coupling filter is connected with transmitting antenna.
2. audio broadcasting warning device in down-hole according to claim 1, it is characterized in that, the audio frequency enlarger arranges two lead-out terminals, a lead-out terminal is connected with the input terminal of coupling filter, another lead-out terminal links to each other with the lead-out terminal of coupling filter, another input terminal of coupling filter, lead-out terminal are connected in series to respectively in the transmitting antenna loop, and ground device connects and composes the loop with transmitting antenna respectively.
3. audio broadcasting warning device in down-hole according to claim 1 and 2 is characterized in that, described transmitting antenna is the protective wire of underground power supply system.
4. audio broadcasting warning device in down-hole according to claim 1 is characterized in that, described coupling filter is connected in parallel by the winding of transformer and electric capacity and constitutes resonance circuit, and resonant frequency is 50Hz.
5. audio broadcasting warning device in down-hole according to claim 1 is characterized in that the audiorange 100Hz-12kHz of described audio frequency enlarger.
6. audio broadcasting warning device in down-hole according to claim 1 is characterized in that, described apparatus for receiving audio adopts earphone.
7. audio broadcasting warning device in down-hole according to claim 6 is characterized in that, described earphone and audio signal wireless connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310292686.1A CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310292686.1A CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
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| Publication Number | Publication Date |
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| CN103334793A true CN103334793A (en) | 2013-10-02 |
| CN103334793B CN103334793B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310292686.1A Expired - Fee Related CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2211674Y (en) * | 1994-07-26 | 1995-11-01 | 陈仪坤 | Frequency modulating power amplifier |
| CN2313336Y (en) * | 1997-06-06 | 1999-04-07 | 陶成果 | Multifunction cordless receiving device |
| CN1241072A (en) * | 1998-07-03 | 2000-01-12 | 重庆新大地电子有限公司 | Method and system for VLF ground-wave broadcast and communication |
| KR20030080492A (en) * | 2002-04-09 | 2003-10-17 | 이명신 | Auto grounding switching circuit |
| KR100857769B1 (en) * | 2008-01-11 | 2008-09-09 | 주식회사 동양이지텍 | Ground equipment with microcomputer for electric field-shielding of hot-water boiler mat |
| CN203335133U (en) * | 2013-07-12 | 2013-12-11 | 河北联合大学 | Downhole audio broadcasting alarm device |
-
2013
- 2013-07-12 CN CN201310292686.1A patent/CN103334793B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2211674Y (en) * | 1994-07-26 | 1995-11-01 | 陈仪坤 | Frequency modulating power amplifier |
| CN2313336Y (en) * | 1997-06-06 | 1999-04-07 | 陶成果 | Multifunction cordless receiving device |
| CN1241072A (en) * | 1998-07-03 | 2000-01-12 | 重庆新大地电子有限公司 | Method and system for VLF ground-wave broadcast and communication |
| KR20030080492A (en) * | 2002-04-09 | 2003-10-17 | 이명신 | Auto grounding switching circuit |
| KR100857769B1 (en) * | 2008-01-11 | 2008-09-09 | 주식회사 동양이지텍 | Ground equipment with microcomputer for electric field-shielding of hot-water boiler mat |
| CN203335133U (en) * | 2013-07-12 | 2013-12-11 | 河北联合大学 | Downhole audio broadcasting alarm device |
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| Publication number | Publication date |
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| CN103334793B (en) | 2015-06-10 |
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