CN201846566U - Electromagnetic shielding device with power supply surge protective device and signal wire and control circuit protective device - Google Patents
Electromagnetic shielding device with power supply surge protective device and signal wire and control circuit protective device Download PDFInfo
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- CN201846566U CN201846566U CN201020113723XU CN201020113723U CN201846566U CN 201846566 U CN201846566 U CN 201846566U CN 201020113723X U CN201020113723X U CN 201020113723XU CN 201020113723 U CN201020113723 U CN 201020113723U CN 201846566 U CN201846566 U CN 201846566U
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Abstract
The utility model provides an electromagnetic shielding device with a power supply surge protective device and a signal wire and control circuit protective device. The electromagnetic shielding device is characterized in that an internal shielding body and an external shielding body are both of a closed edge-free box body structure, wherein the internal shielding body has N layers (N is equal to 1-5), and a power supply surge protective device (SPD) is arranged between the internal shielding body and the external shielding body (the manufacturing thickness of a low-carbon steel plate is 10mm); and a signal wire and control circuit protective device (SPD) prevents the current induced by a high-intensity magnetic field from flowing into the shielding bodies along a power supply cable and a signal cable and is in earthing connection or equipotential connection with the power supply surge protective device (SPD) which is connected with an earthing conductor of each shielding body, so as to discharge the enormous current which is instantaneously induced by the high-intensity magnetic field on the surfaces of the internal shielding body and the external shielding body; a non-conducting and non-magnetism conducting fixed skeleton is used for fixing the internal shielding body and the external shielding body; a wire inlet and a wire outlet correspond to each other and are not arranged on the same line; and the side surface of each shielding body is provided with a door which is pushed and pulled outwards. The electromagnetic shielding device has novel design and ingenious combination, is easy to install, and meets the shielding requirements on high-frequency and low-frequency magnetic fields.
Description
Technical field
The utility model relates to power source surge protector (SPD); Holding wire, control circuit protector (SPD); Electromagnetic screen.Refer in particular in a multilayer screen device and between the external shielding body, arrange power source surge protector (SPD); Arrange holding wire, control circuit protector (SPD); the electric current that the high-intensity magnetic field that stops the electromagnetic pulse weapon blast to produce induces along power supply, signal cable enters in the shield; external shielding body and power source surge protector (SPD) in earth lead connects; connect by ground connection or equipotential, bleed off the huge current flow that strong-electromagnetic field induced in interior external shielding body surface moment.
Background technology
Electromagnetic pulse (EMP) is a weakness of utilizing the intrinsic electromagnetic property of parts in the electronic system, can make the paralysis of a large amount of electronic equipments and electronic system or is destroyed in moment.
One, electromagnetic pulse classification
1, to be called nuclear electromagnetic pulse nuclear electromagnetic pulse (HEMP) be the electromagnetic pulse that excites ionized atmosphere to produce by the gamma-rays that the nuclear explosion of 30～500km overhead produces to the electromagnetic pulse that produces of nuclear explosion, therefore also becomes high-altitude electromagnetic pulse.The amplitude of HEMP depends on the equivalent of nuclear explosion, this pulse rises to 019 of peak value from 011 of peak value and only needs 5ns, and half the needed time that drops to peak value from the top is about 200ns, therefore the frequency spectrum of its covering is very wide, from 10kHz～1MHz almost is flat, HEMP peak value field intensity height, the rise time ground scope fast, that cover that reduces the nuclear explosion in high altitude generation from 1～100MHz gradually is wide, can produce very strong HEMP (electric field strength 50～100kV/m) on millions of square kilometres region.(list of references " airplane design " in October, 2008; Article numbering: 1673-4599 (2008) 05-0059-03)
2, NON-NUCLEAR ELECTROMAGNETIC PULSE (EMP) then utilizes the energy that explosive charge or chemical fuel burning produce, convert the high power microwave radiation energy to by microwave device, can emission peak power more than gigawatt, frequency is the pulse microwave bundle of 1 gigahertz (GHZ)～300 gigahertz (GHZ)s, go up the transient voltage that sharply produces thousands of volts at exposed electric conductor (for example track of Luo Lu electric wire, printed circuit board (PCB)), a large amount of electronic equipments are caused the damage that to retrieve.
3, Lightning Electromagnetic Pulse (LEMP) is powerful lightning stream and the electromagnetic field thereof as interference source that sky produces when thundering.Its induction range is very big, to computer and traffic guidance system and various electric equipment and pipeline in various degree harm can be arranged all.
Two, the characteristics of electromagnetic pulse weapon: electromagnetic pulse weapon is compared with traditional weapon as a kind of new concept weapon, in basic principle, kill and wound destructive power and all have remarkable different with aspects such as the modes of operation.Its unique distinction also is:
1, target kill is polynary: electromagnetic pulse weapon can disturb and destroy the nearly all electronic equipments such as aircraft, radar, computer, phone and mobile phone in the tens of kms of radius.The strong electromagnetic pulse that gives off can also produce induced current by being exposed to ground antenna, creeps into undergroundly always, destroys various hidden electronic equipments in underground installation.
2, cost effectiveness height: the EMP bomb is with low cost, makes one piece of common compact electromagnetic pulse bomb and only needs the hundreds of dollar, far below conventional bomb.And carry one piece of EMP/T Bomb with cruise missile, and only need set out a sortie, just can hit a plurality of targets simultaneously.
3, flat pad is various: generally with aircraft, the naval vessels carrier that delivery is thrown as electromagnetic pulse weapon, and also can be with large caliber gun or rocket launching.U.S. Air Force Project all loads onto the EMP bomb for bomber, fighter plane, cruise missile and drone.
4, have soft, hard two kinds of killing abilities: both can implement electronic jamming to enemy's command and control system, radar system, communication apparatus, make its detection, control and communication equipment blinding, cause deaf, cause mute, also can regularly, fixed point give enemy's radar system, communication equipment etc. are with fatal destruction.
5, can reach tactics, strategic purpose: tactics type EMP bomb mainly carries out clearly, attacks targetedly some fixed targets, and target selection has popularity, and tactics application has flexibility.Strategy type EMP bomb is primarily aimed at enemy state's strategic objective, as high-intensity bombing is implemented in capital, industrial important city etc., causes the other side commander's paralysis, message interrupts of overall importance, destroys enemy state and produces normally and life, applies huge psychological pressure to the common people.(list of references: " aerospace electron antagonism " the 22nd the 6th phase of volume, middle figure classification number: TN974; TJ864, file identification sign indicating number: A)
6, the strike to consumer electronic device also is huge: savings and account system all paralyse, and phone, mobile phone are silent, and traffic lights are malfunctioning, and air line can not move ... country all could paralyse in all cities! Suffer the country of this strike, can get back to 200 years overnight before! (list of references: the military channel of www.china.com " U.S. 2012 comprehensively equipment pulse weapon get the jump on Sino-Russian before "
Three, four aspects of electromagnetic pulse protection
1, shielding: shielding is the transmission that utilizes shield to stop or reduce electromagnetic energy, reaches a kind of important means of electromagnetic protection, and this shield does not allow electromagnetic field arrive protected equipment.But all electronic equipments all will obtain electric power, also all will communicate by letter with the external world, and these inlet points provide chance for the entering of electric transient process of high energy ELECTROMAGNETIC WEAPON.
2, ground connection processing is that electronic equipment is connected with the earth with approach by suitable method, to improve the stability of electronic device circuitry system works, suppress the influence of external electromagnetic field effectively, avoid the casing electric charge to accumulate too much guiding discharge and the interference and the damage that cause.
3, filter: filter can be by resistance, inductance, electric capacity one class is passive or active device is formed selective network, passes through to stop all the other compositions outside the useful band, finishes filter action; Also can form, undesirable frequency content be sponged, reach the effect of filtering by it by ferrite one class lossy material.(list of references: " space electronic technology " the 3rd phase in 2004＜electromagnetic pulse weapon principle and protection thereof 〉)
4, technical safeguard: U.S. army has used a kind of lightning arrester with wire now, can effectively reduce the interfering energy of strong electromagnetic pulse.(＜marine electronic engineering〉figure classification number in 2004 years the 24th volume " military electronics are for the protection of strong electromagnetic pulse ": 0441.4)
Five, the serial surge filtering product technology of SINETAMER (hereinafter to be referred as the S series of products) produced in USA is introduced
The S series of products are that world-leading electric power purifies, precision instrument is protected, power surge filtering protection product.The patented technology of its sinusoidal wave tracking filter and special chemistry encapsulation comprises surge protection and filtering technique, meets very much the specification requirement of electromagnetic pulse protection.At ground force, naval, the army of air force and the extensive use S of frontier guards series surge filtering protection product, S series surge filtering protection product has following advantage to US military:
1, multistage preventing mechanism, residual voltage can reach 0V through the surge voltage of water conservancy diversion generally between 2.5KV～15KV, the SPD product that is equipped with should reach extremely low residual voltage through after the multistage protection, special industry can reach 0 volt.The general surge protection product in market, maximum through-flow 40KA, GB residual voltage value is 1800.S product 40KA impacts, and the residual voltage value is less than 600V.Residual voltage is more little, and the protection effect is good more.Under 8/20us simulation thunder and lightning test environment, charging voltage 24.9KV, current peak 47.8KA, residual voltage value 551V is much smaller than the home products standard.
2, response speed is less than 1 nanosecond, effectively protect secondary thunder, induction thunder and and the electric inside Transient Voltage Suppressor that shoves be called for short TVS.The TVS diode response time is less than 1 nanosecond.The piezo-resistance response speed that other surge protection product adopts was 25 nanoseconds.The TVS advantage: bidirectional protective characteristic, response speed fast (nanosecond order), absorb surge power big (transient power reaches thousands of watts), clamping voltage is easy to control, leakage current is low, do not have the limit of damage, volume is little.
3, shell adopts NEMA 4 standards, waterproof, fire prevention, explosion-proof, antistatic.
4, the sinusoidal wave ORN tracking technique of patent is accurately eliminated surge, humorous wave energy.Traditional product is to adopt to descend traditionally the filtering of clamp-type threshold values, and pressure-sensitive characteristic is conducting over the ground when voltage reaches threshold values, thereby reaches the purpose of leakage current.The S product adopts the sinusoidal wave tracking filter of patented technology enhancement mode ORN, by certain sinusoidal wave positive and negative skew percentage, follows the tracks of and eliminates surge " stolen goods ", purify power utilization environment, and the residual voltage value is very low.In computer communication system, electronic equipment, electromagnetic pulse is coupled in the circuit by lead and goes, thereby the energy conduction of product overvoltage is in the line disturbed to the equipment, damage equipment.Energy shows as overvoltage during the lead coupling.The ORN filtering technique resists scope by the tracking technique filtering voltage, and " cleaning " of the power supply of assurance, signal makes computer system, electronic equipment etc. avoid the interference and the damage of electromagnetic pulse.
5, unique chemistry encapsulation patented technology, the voltage tester of the unfailing performance 500V that the guarantee device is lasting does not have MOV48 temperature second of chemical packaging protection to rise to 200 ℃, and the test that continues can make MOV blast at short notice.And through after the special chemistry encapsulation, the voltage tester of 500V, 3 minutes 30 seconds temperature of MOV of the chemical packaging protection of process remain on 105 ℃, and remain on a little temperature always.And special chemistry sealing, can absorb the heat that produces in the surge process rapidly, protection product components and parts prolong device useful life.In the electromagnetic pulse coupling process, energy is very big, and is also very high to the electronic component device requirement of filter apparatus.And the special chemistry sealing of S product is shifted energy by distribute heat, has guaranteed the useful life of components and parts, thereby system safety is dared in protection.
6, real 10 moulds (full mould) are protected, and blocking-up surge institute might passage.For military equipment, require to carry out between line and the line filtering protection.The full mould protection of S product has been blocked line and line, all possible passage of line and ground, thereby equipment has been played perfect protection
7, mix the diversification module, hot, electric dual fail-safe fusing capacitor design.
8, unique can be earth-free surge protection product X product adopt the sinusoidal wave tracking technique of patent, special chemistry encapsulation, and nanosecond TVS element, ten moulds protection and mix the diversification module makes the S product not release energy by ground connection.Because full mould protection, the energy that totally 70 MOV, every MOV share is fewer.When the outside does not have ground connection, MOV can discharge the energy of surge by the heating of self when absorbing surge.And the encapsulation of special chemistry, can absorb the heat that MOV produces rapidly, guarantee the MOV components and parts.Thereby making product can carry out energy under unearthed situation discharges.When the S product can not ground connection, require ground wire to do equipotential and connect.In the mobile device in military communication system, because the character that moves has determined that the equipment ground system will be perfect not to the utmost.And traditional surge filtering product all needs the ground connection of high request.The S product can be accomplished surge filtering protection under earth-free situation, more adapt to army's maneuver warfare requirement.(list of references: U.S. ECS company " SINETAMER series of products specification ")
Six, the equipment situation of various countries army electromagnetic pulse weapon
Septic yanks are comprehensive equipment pulse weapon in 2012, get the jump on Sino-Russian before.2004, U.S. army began electromagnetic pulse weapon of new generation is carried out extensive testing, and the electromagnetic pulse weapon cost that plan involves great expense is the most at present reduced to about 400 dollars.(list of references: the military channel of www.china.com " U.S. 2012 comprehensively equipment pulse weapon get the jump on Sino-Russian before ")
Seven, the kind of electromagnetic shielding
1, frequency electromagnetic waves shielding, the main employing absorbs and principle of reflection, and frequency electromagnetic waves produces strong eddy current effect and electromagnetic wave is absorbed when running into the metallic shield body, simultaneously because its wave impedance is very high, frequency electromagnetic waves generation reflection loss.
2, magnetostatic field shielding: during the high magnetic conduction shield of magnetic field by a closure, because the permeability of shield is very high, magnetic resistance is very low, and magnetic field can be by the derivation of magnetic screen path, and the magnetic field of the shield that bleeds is significantly reduced.
3, ultralow frequency electromagnetic shielding mainly based on the magnetic shielding principle, will be considered electromagnetic compatibility simultaneously, also has the shielding action that the part eddy current effect produces.
Eight, the principle of electromagnetic shielding and shield manufactured materials chooses
Low frequency electromagnetic Bob frequency electromagnetic waves has higher magnetic-field component, and for low-down interfering frequency, the permeability of shielding material is even more important during more than high frequency.The basic principle of shielding low frequency (as power frequency) electromagnetic interference is the magnetic path parallel connection by-pass shunt.By using permeability magnetic material (as mild steel, silicon steel etc.) to provide the magnetic bypass to reduce the magnetic flux density of shield inside.Increase eddy current loss simultaneously as far as possible, make part energy be converted into thermal energy consumption and fall.The thick more then magnetic resistance of shielding material is more little, eddy current loss is big more, and shield effectiveness is good more.Conductance height and the low material (as copper, aluminium etc.) of permeability does not almost have shielding action to electromagnetic magnetic-field component
Magnetic permeability is also relevant with externally-applied magnetic field intensity, and when externally-applied magnetic field intensity was low, magnetic permeability raise with the increase of externally-applied magnetic field, when externally-applied magnetic field intensity surpassed certain value, magnetic permeability sharply descended, and it is saturated at this moment to claim material to take place, in a single day material takes place saturated, has just lost magnetic screening action.The magnetic permeability of material is high more, and is easy more saturated.Therefore, in very strong magnetic field, the material that magnetic permeability is very high does not have good screening effectiveness.The magnetic permeability of mild steel is about 4000, and saturation intensity low carbon steel plate good mechanical property, good, the easy processing of solderability, is difficult for saturatedly about 22000, is the first-selection of low frequency electromagnetic shielding material, utilizes the satisfied screening effectiveness of acquisition that mild steel can be cheap.
The deficiencies in the prior art part
1, Bi He shield, it has characteristics simple in structure, easily manufactured, with low cost, weak point is 1, present, and common super low frequency electromagnet shielding device is that (be exactly to adopt the individual layer Alperm to form one: 1, shielding factor is low, generally at 20～30dB for single layer structure; 2, the shielding of compatible high-intensity magnetic field and low-intensity magnetic field simultaneously; 3, outside screen is exposed to, is impacted easily, collided and caused the reduction (when Alperm was subjected to impacting, magnetic permeability can descend) of screening effectiveness; Therefore, the super low frequency electromagnet shielding device of this single layer structure, (the electromagnetic shielding coefficient is at 20～30dB to be only applicable to the lower place of shielding requirements; The electromagnetic shielding coefficient is high more, and the shielding requirements of instrument and equipment is tight more), and (in general the electromagnetic shielding coefficient is irrealizable 75～90dB) for the higher place of shielding requirements.Even shield thickening shield effectiveness is also undesirable.
2, in three (shielding, ground connection, filtering) major measure of tempest, often simple the employing shields the electromagnetic pulse protection that can not provide complete, receives and transmitting antenna because the cable in equipment or the system is the most effective electromagnetic pulse.Especially concerning the system that equipment that external antenna is arranged and multiple devices are connected to form by cable, simple shielding can't reach requirement of shelter.A kind of effective measures add filter exactly, cut off the path of nuclear electromagnetic pulse along holding wire or power line propagation, with the perfect nuclear electromagnetic pulse protection of the common formation of shielding.Filtering is in order to prevent that undesirable electromagnetic viscosimeter from propagating into equipment along any aerial lug that links to each other with equipment, generally finished by filter.Adopting filter to suppress NEMP is one of necessary means of nuclear electromagnetic pulse protection.Particularly be coupled to energy in the circuit to suppressing through lead, it is a kind of extensive adopted method.
3, in the earth lead of existing single or multiple lift electromagnetic screen; do not install power source surge protector (SPD) additional; after the electromagnetic pulse weapon blast; the highfield and the high-intensity magnetic field that produce can be on earth leads; induce several kilovolts of electric currents of training to several Wan An to voltage and a few kiloampere of several ten thousand volts; this electric current enters in the shield along the slit of earth lead shield
Summary of the invention
The utility model is the electromagnetic screen of a kind of charged source of design Surge Protector holding wire control circuit protector, it adopts the multi-layer box structure of no corner angle, between the external shielding body or in the shield, the electric current that power source surge protector (SPD) is installed, stops high-intensity magnetic field to induce enters in the shield along cable in a multilayer screen device portal place; Holding wire, control circuit protector (SPD) are installed; stop in the disturbing wave entering signal line cable; the power source surge protector (SPD) that is connected with the shield earth lead connects by ground connection or equipotential, bleeds off the huge current flow that strong-electromagnetic field induced in screening arrangement surface moment.Be used for the automation operational chain of command of military computer composition and the electromagnetic shielding of communication system, this screening arrangement is reasonable in design, easy to manufacture, easy to install and use, and effectiveness is good, has satisfied the shielding requirements to high frequency and ultralow frequency magnetic field.
The electromagnetic screen of charged source Surge Protector holding wire control circuit protector, it is characterized in that: screening arrangement is by outer shield (1), internal layer shield (2), first power source surge protector (7); Holding wire, control circuit protector (8), second source Surge Protector (9), the 3rd power source surge protector (10), first earth lead (17), second earth lead (18) are formed.Outer shield (1) and internal layer shield (2) are the low carbon steel plate manufacturings by thickness 10mm, internal layer shield (2) has spacing=70～120mm, with 1～5 layer of shield that welds, the riveted joint mode is made with steel plate, when splicing place is welded, do the welding inserts with the shield masterbatch, the overlapping 10～30mm of the shielding material of splicing place.Outer shield (1) has 1～8 cable that is installed into the gas outlet of the air inlet of first hole (4) of outlet, a diameter 50mm, 1 diameter 50mm, 1 diameter 20mm to be imported and exported, and the holding wire of 1 diameter 20mm is imported and exported; Internal layer shield (2) has 1～8 holding wire import and export that are installed into the cable import and export of the gas outlet of the air inlet of second hole (5) of outlet, 1 diameter 50mm, 1 diameter 50mm, 1 diameter 20mm, 1 diameter 20mm, and first hole (4) do not become corresponding relation point-blank with second hole (5).Spiral-shaped with bending to, as to bend to S shape shielding steel pipe (20) or the shielding steel pipe (20) that bends to 90 ° of long 30mm are as the screening arrangement of first hole (4), be welded on the outer shield (1), or outer shield (1) and the shielding steel pipe (20) tighten by thread, each first hole (4) join 1 the shielding steel pipe (20).Non-conductive skeleton (3) between outer shield (1) and the internal layer shield (2) by non-conductive and not the magnetic conduction nonmetallic materials make, the high 100mm of skeleton (3), wide 60mm, 12 of quantity, fixing with first screw (6) of long 20～30mm from inside to outside at internal layer shield (2), fixing at outer shield (1) ecto-entad with second screw (11) of long 20～30mm, the installation of staggering of first screw (6) and second screw (11), and no longer on the straight line, not on a side, first, second screw is made with the shielding material masterbatch, do the welding inserts with covering the material masterbatch, with first of ectonexine shield, the cap nut weldering of two-screw is dead.Power line cable in 1～9 first power source surge protector (7) being installed and being entered shield between outer shield (1) and internal layer shield (2) is in parallel or be installed in series; 1～9 holding wire, control circuit protector (8) are installed between outer shield (1) and internal layer shield (2), holding wire, control circuit protector (8) and the signal line cable that enters in the shield are connected in series, holding wire, control circuit protector (8), first power source surge protector (7) and the 3rd power source surge protector (10) are installed in the 50-200mm apart from the place, doorway, so that maintenance and change, with the 3rd screw (19) first power source surge protector (7); Holding wire, control circuit protector (8) are fixed on the internal layer shield (2), and the 3rd screw (19) is welded on the outer surface of internal layer shield (2).Perhaps first power source surge protector (7); Holding wire, control circuit protector (8) are arranged in outside second hole (5), apart from second hole 50mm～300mm, are fixed on the outer surface of internal layer shield (2) with the 3rd screw (19).Or first power source surge protector (7); Holding wire, control circuit protector (8) are arranged in second hole (5) of internal layer shield (2), are fixed on the inner surface of internal layer shield (2) with the 3rd screw (19).Second source Surge Protector (9) is connected with outer shield (1); and be connected with second earth lead (18); the 3rd power source surge protector (10) is connected with internal layer shield (2) and is connected with first earth lead (17); first and second earth lead can't done the equipotential connection during ground connection, and the connected mode of second and third power source surge protector and first and second earth lead is a serial or parallel connection.
Compared with prior art, the present invention has following advantage:
1, novel in design, structure is ingenious; 2, making is simple, with low cost; 3, easy to use, effectiveness is good;
4, be fit to army's motorization operational need.
Description of drawings
Fig. 1 is a structural representation of the present invention; Fig. 2 is the front schematic view of sliding door 14; Fig. 3 is the end view of Fig. 2; Fig. 4 internal shield and external shielding body connecting screw be connected the skeleton schematic diagram; Fig. 5 is the structure chart of fixed screw 19 and inner shield body 2; Fig. 6 is the hole 4 of external shielding body and the connection layout of shielding conduit 20.
Specific embodiments
Beijing precision instrument protection equipment company implements the utility model scheme, the electromagnetic shielding that is used for a kind of traffic guidance system, the electromagnetic screen of charged source provided by the invention Surge Protector holding wire control circuit protector is characterized in that: screening arrangement is installed power source surge protector (SPD) 7 by outer shield 1, internal layer shield 2, power supply; Holding wire, control circuit protector (SPD) 8; The power source surge protector (SPD) 9,10 that is connected with shield earth lead 17,18 is formed.The shield shape is the body structure of the no corner angle of rectangle (long 5m, wide 4m, high 3m), closure.The shield side has dodge gate 14 (N=1) to adopt hinge 12 (N=3) to be connected with outer shield 1, and the inlet/outlet that is used for protected equipment is shut with locking 13 (N=3) and tightly fastened.14 fens double-layer structure internal layers 15 of outer dodge gate and outer 16,15,16 joint portions will with shield 1,2 tight interlocks overlapping 10～50mm also, prevent that electromagnetic pulse from entering.Outer shield 1 is by the conduction of thickness 10mm, (shell that can be used as shield uses in the low carbon steel plate manufacturing of magnetic conduction, high-intensity magnetic field is played shielding action), inboard shield 2 is to be conducted electricity by thickness 10mm, the low carbon steel plate manufacturing of magnetic conduction, internal layer shield 2 (N=1 layer), work to continue the electric field magnetic field that shielding shield 1 does not have shielding to live, shield 1 and shield 2 spacings=70-120mm are with welding, the riveted joint mode is made into shield with low carbon steel plate, when splicing place is welded, do the welding inserts with the shielding material masterbatch, the hole 4 (N=4) that the turnover line of the overlapping 10～30mm. of the shielding material of splicing place outside shield 1 is installed, 1 air inlet (diameter 50mm), 1 gas outlet (diameter 50mm), cable is imported and exported 1 (diameter 20mm), holding wire is imported and exported 1 (diameter 20mm), 1 air inlet in hole 5 (N=4) (diameter 50mm) that the turnover line of inner shield body 2 is installed, 1 gas outlet (diameter 50mm), cable is imported and exported 1 (diameter 20mm), and holding wire is imported and exported 1 (diameter 20mm).For preventing that the high-frequency electromagnetic pulse from penetrating, hole 4 and hole 5 not on a side, become corresponding relation not point-blank.With the steel pipe of crooked 90 ° of long 300mm shielding steel pipe 20 as turnover lead hole 4, convenient all kinds of lead turnover, prevent that the short millimeter electromagnetic wave of wavelength from entering in the shield 1 along hole 4, shielding steel pipe 20 can be soldered to be put thread also can in the shielding 1 shield 1 and shielding steel pipe 20 to be tightened on the shield 1, and a shielding steel pipe 20 is joined at each hole 4.Between shield 1 shield 1 skeleton 3 by non-conductive and not magnetic conduction (prevent the electric current that strong electromagnetic pulse produces on shield 1, skeleton 3 by conduction is transmitted on the shield 2, and on shield 2, induce highfield and magnetic field) engineering plastics make the wide 60mm of (N=12 root) high 100mm) with the parallel installation in shield base, length identical with shield length (the wide 60mm of high 100mm).Screw 6 with long 20～30mm is fixing from inside to outside in shield 2 inside, fixing at shield 1 outside ecto-entad with the screw 11 of long 20～30mm, screw 6 and 11 installation of staggering, and not point-blank, screw 6,11 usefulness shielding material masterbatch are made, do the welding inserts with covering the material masterbatch, the screw 6 of interior external shielding body and 11 cap nut are welded extremely, prevent that electric field, field supply from leaking into.Every line of power source surge protector (SPD) 7 (N=1～3) three-phase electricity is installed is connected 1, in parallel or be installed in series, be installed between shield 1 and 2; The signal line cable of holding wire, control circuit protector (SPD) 8 (N=1) being installed and entering in the shield is installed in series, and is installed between shield 1 and 2.With fixed screw 19 with power source surge protector (SPD) 7; Holding wire, control circuit protector (SPD) 8 are fixed on outer 2 outer surfaces of shield, are arranged in apart from the doorway and locate 50～200mm so that maintenance and replacing are welded on fixed screw 19 on the outer surface of shield 2.Power source surge protector (SPD) 9 (N=1) is connected with outer shield 1, and is connected with earth lead 18 (N=1), and the electric current that goes out at the shield surface induction is imported the earth; Power source surge protector (SPD) 10 (N=1) is connected with outer shield 2 and is connected with earth lead 17 (N=1); the electric current that goes out at shield 2 surface inductions is imported the earth; earth lead 17,18 is can't ground connection the time; can do equipotential connects; reaching the purpose of consumed power by power source surge protector (SPD) 9,10 heating, power source surge protector (SPD) 10 is fixed on the outer surface of shield 2 with fixed screw 19. the connected mode of power source surge protector (SPD) 9,10 and earth lead 17,18 is serial or parallel connections.
The utlity model has characteristics reasonable in design, easy to manufacture, easy to install and use, that effectiveness is good, measured data reaches ultralow frequency (0～300HZ frequency range), (shielding factor reaches 75～90dB) specification requirement (seeing Table), has satisfied the electromagnetic shielding requirement of high-end products such as ultralow frequency device sensitivity measurement in the height shielding of magnetic interference.
The measured data table one of electromagnetic screen
Claims (8)
1. the electromagnetic screen of charged source Surge Protector holding wire control circuit protector, it is characterized in that: screening arrangement is by outer shield (1), internal layer shield (2), first power source surge protector (7); Holding wire, control circuit protector (8), second source Surge Protector (9), the 3rd power source surge protector (10), first earth lead (17), second earth lead (18) is formed, outer shield (1) and internal layer shield (2) are the low carbon steel plate manufacturings by thickness 10mm, internal layer shield (2) has spacing=70～120mm, with welding, 1～5 layer of shield that the riveted joint mode is made with steel plate, when splicing place is welded, do the welding inserts with the shield masterbatch, overlapping 10～the 30mm of the shielding material of splicing place, outer shield (1) has 1～8 first hole (4) that is installed into outlet, the air inlet of a diameter 50mm, the gas outlet of 1 diameter 50mm, the cable of 1 diameter 20mm is imported and exported, and the holding wire of 1 diameter 20mm is imported and exported; Internal layer shield (2) has 1～8 second hole (5) that is installed into outlet, the air inlet of 1 diameter 50mm, the gas outlet of 1 diameter 50mm, the cable of 1 diameter 20mm is imported and exported, the holding wire of 1 diameter 20mm is imported and exported, first hole (4) does not become corresponding relation point-blank with second hole (5), spiral-shaped with bending to, bend to the shielding steel pipe (20) of S shape or bend to the screening arrangement of the shielding steel pipe (20) of 90 ° of long 30mm as first hole (4), be welded on the outer shield (1), or outer shield (1) and the shielding steel pipe (20) tighten by thread, 1 shielding steel pipe (20) is joined at each first hole (4), non-conductive skeleton (3) between outer shield (1) and the internal layer shield (2) by non-conductive and not the magnetic conduction nonmetallic materials make, the high 100mm of skeleton (3), wide 60mm, 12 of quantity, fixing with first screw (6) of long 20～30mm from inside to outside at internal layer shield (2), fixing at outer shield (1) ecto-entad with second screw (11) of long 20～30mm, the installation of staggering of first screw (6) and second screw (11), and no longer on the straight line, not on a side, first, second screw is made with the shielding material masterbatch, do the welding inserts with covering the material masterbatch, with first of ectonexine shield, the cap nut weldering of two-screw is dead, power line cable in 1～9 first power source surge protector (7) being installed and being entered shield between outer shield (1) and internal layer shield (2) is in parallel or be installed in series, between outer shield (1) and internal layer shield (2), 1～9 holding wire is installed, control circuit protector (8), holding wire, control circuit protector (8) is connected in series with the signal line cable that enters in the shield, holding wire, control circuit protector (8), first power source surge protector (7) and the 3rd power source surge protector (10) are installed in the 50-200mm apart from the place, doorway, so that maintenance and change, with the 3rd screw (19) first power source surge protector (7); Holding wire, control circuit protector (8) are fixed on the internal layer shield (2), the 3rd screw (19) are welded on the outer surface of internal layer shield (2), perhaps first power source surge protector (7); Holding wire, control circuit protector (8) are arranged in outside second hole (5), and distance second hole 50mm～300mm is fixed on the outer surface of internal layer shield (2) with the 3rd screw (19), or first power source surge protector (7); Holding wire; control circuit protector (8) is arranged in second hole (5) of internal layer shield (2); be fixed on the inner surface of internal layer shield (2) with the 3rd screw (19); second source Surge Protector (9) is connected with outer shield (1); and be connected with second earth lead (18); the 3rd power source surge protector (10) is connected with internal layer shield (2) and is connected with first earth lead (17); first; two earth leads are done equipotential can't ground connection the time and are connected second; three power source surge protectors and first; the connected mode of two earth leads is serial or parallel connections.
2. the electromagnetic screen of charged source according to claim 1 Surge Protector holding wire control circuit protector; it is characterized in that: first power source surge protector (7) is 1 or 3; be arranged in the inside of outer shield (1), in parallel with the power line cable that enters or be connected in series.
3. the electromagnetic screen of charged source according to claim 1 Surge Protector holding wire control circuit protector; it is characterized in that: holding wire, control circuit protector (8) are 1 or 3; be arranged in the inside of outer shield (1), be connected in series with the signal line cable that enters.
4. the electromagnetic screen of charged source according to claim 1 and 2 Surge Protector holding wire control circuit protector; it is characterized in that: first power source surge protector (7); be arranged in the inside of outer shield (1), the outside of internal layer shield (2); in parallel with the cable that enters or be connected in series; with the 3rd screw (19) first power source surge protector (7) is fixed on the outer surface of internal layer shield (2), the 3rd screw (19) welds or is screwed on the internal layer shield (2) with thread.
5. according to the electromagnetic screen of claim 1 or 3 described charged source Surge Protector holding wire control circuit protectors; it is characterized in that: holding wire, control circuit protector (8) are 1 or 3; be arranged in the inside of outer shield (1), the outside of internal layer shield (2); connect with the signal line cable that enters; with the 3rd screw (19) holding wire, control circuit protector (8) are fixed on the outer surface of internal layer shield (2), the 3rd screw (19) welds or is screwed on the internal layer shield (2) with thread.
6. the electromagnetic screen of charged source according to claim 1 Surge Protector holding wire control circuit protector; it is characterized in that: the second source Surge Protector (9) that is connecting second earth lead (18) is 1; be arranged in the outer surface of outer shield (1), in parallel with second earth lead (18) or be connected in series.
7. the electromagnetic screen of charged source according to claim 1 Surge Protector holding wire control circuit protector; it is characterized in that: the 3rd power source surge protector (10) that is connecting first earth lead (17) is 1; be arranged in the inside of outer shield (1); the outside of internal layer shield (2); in parallel with first earth lead (17) or be connected in series; with the 3rd screw (19) the 3rd power source surge protector (10) is fixed on the outer surface of internal layer shield (2), the 3rd screw (19) welds or is screwed on the internal layer shield (2) with thread.
8. the electromagnetic screen of charged source according to claim 1 Surge Protector holding wire control circuit protector, it is characterized in that: the skeleton (3) between outer shield (1), the internal layer shield (2) is by non-conductive and non-magnetic plastic production.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020113723XU CN201846566U (en) | 2010-01-27 | 2010-01-27 | Electromagnetic shielding device with power supply surge protective device and signal wire and control circuit protective device |
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| CN201020113723XU CN201846566U (en) | 2010-01-27 | 2010-01-27 | Electromagnetic shielding device with power supply surge protective device and signal wire and control circuit protective device |
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| CN201846566U true CN201846566U (en) | 2011-05-25 |
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| CN201020113723XU Expired - Fee Related CN201846566U (en) | 2010-01-27 | 2010-01-27 | Electromagnetic shielding device with power supply surge protective device and signal wire and control circuit protective device |
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