CN108934153A - A kind of filter - Google Patents

A kind of filter Download PDF

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Publication number
CN108934153A
CN108934153A CN201811112194.9A CN201811112194A CN108934153A CN 108934153 A CN108934153 A CN 108934153A CN 201811112194 A CN201811112194 A CN 201811112194A CN 108934153 A CN108934153 A CN 108934153A
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CN
China
Prior art keywords
layer
thermally conductive
conductive sheet
filter
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811112194.9A
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Chinese (zh)
Inventor
刘雷
王智风
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Hexinfang Electronic Technology Co Ltd
Original Assignee
Nanjing Hexinfang Electronic Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Hexinfang Electronic Technology Co Ltd filed Critical Nanjing Hexinfang Electronic Technology Co Ltd
Priority to CN201811112194.9A priority Critical patent/CN108934153A/en
Publication of CN108934153A publication Critical patent/CN108934153A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136Forced ventilation, e.g. by fans
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007Casings
    • H05K9/0015Gaskets or seals

Abstract

The invention discloses a kind of filters, including bottom plate, filter cabinet is connected with above bottom plate, pin is provided at left and right sides of filter cabinet, filter interior is provided with heat dissipating layer and shielded layer, shielded layer is internally provided with circuit element, pin passes through filter cabinet and connect with circuit element, heat dissipating layer includes the first thermally conductive sheet and the second thermally conductive sheet, heat-conducting layer is provided among first thermally conductive sheet and the second thermally conductive sheet, through-hole is offered among heat-conducting layer, second thermally conductive sheet right side opening is equipped with air inlet, venthole is offered on the left of second thermally conductive sheet, internal cavity is provided among first thermally conductive sheet and heat-conducting layer, external cavity is provided among second thermally conductive sheet and heat-conducting layer, second thermally conductive sheet outer surface is connected with radiating fin, insulating layer inner surface is connected with conductive layer, the quadrangle of conductive layer is connected with electromagnetic sealing liner;It may be implemented the heat dissipation of greater efficiency and has preferable shielding properties.

Description

A kind of filter
Technical field
The present invention relates to filter fields, more specifically to a kind of with radiator structure and with function of shielding Filter.
Background technique
Filter is the device or circuit that a kind of pair of signal has processing to act on.As the continuous development of electronic market is also more next More is produced and used extensively.Filter is broadly divided into active filter and passive filter.Main function is to allow useful signal As zero-decrement as possible to pass through, as big as possible to garbage signal reflection.Generally there are two port, an input letters for filter Number, an output signal, can choose a square wave group or compound wave of making an uproar by filter using this characteristic, and obtain one The sine wave of a specific frequency.The function of filter is exactly that the signal of a certain component frequency is allowed smoothly to pass through, and other one For the signal of component frequency then by biggish inhibition, it is substantially a frequency selection circuit.
Filter housing in the prior art uses general metal shell, and no radiator structure is easy using lower for a long time A large amount of heat is generated, the service life of filter itself is reduced, the shielding properties of filter entirety is poor, is easy by the external world Electromagnetic signal interference.
Summary of the invention
1. technical problems to be solved
Aiming at the problems existing in the prior art, problem is as follows:
(1) without radiator structure;
(2) shielding properties is poor.
2. technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of filter, including bottom plate, the bottom plate top are fixedly connected with filter cabinet, and the filter cabinet is left Right two sides are evenly spaced to be provided with several pins, and the filter interior is provided with heat dissipating layer and shielded layer, The shielded layer is fixedly connected on heat dissipating layer inner surface, and the shielded layer is internally provided with circuit element, and the circuit element is solid Surely it is connected to above bottom plate, the pin passes through filter cabinet and circuit element is electrically connected, and the heat dissipating layer includes first Thermally conductive sheet and the second thermally conductive sheet, are provided with heat-conducting layer among first thermally conductive sheet and the second thermally conductive sheet, among the heat-conducting layer Evenly spaced to offer several through-holes, the second thermally conductive sheet right side opening is equipped with air inlet, the second thermally conductive sheet left side Venthole is offered, is provided with internal cavity among first thermally conductive sheet and heat-conducting layer, in second thermally conductive sheet and heat-conducting layer Between be provided with external cavity, second thermally conductive sheet outer surface is evenly spaced to be fixedly connected with several radiating fins, the screen Covering layer includes insulating layer, and the insulating layer inner surface is fixedly connected with conductive layer, and the quadrangle of the conductive layer is fixedly connected to Electromagnetic sealing liner.
Preferably, filter cabinet front and rear sides are fixedly connected to mounting plate, and the mounting plate left and right sides is Offer screw hole.
Preferably, conducting wire is provided on the inside of the conductive layer, the conductive layer and conducting wire one end are electrically connected, the conducting wire The other end passes through composite protection layer and circuit element is electrically connected.
Preferably, the conductive layer and electromagnetic sealing liner outer surface are fixedly connected to composite protection layer, the conducting wire The other end passes through composite protection layer and circuit element is electrically connected.
Preferably, it is provided with exhaust fan above the venthole, is fixedly connected with temperature sensor above the bottom plate, Middle temperature sensor model number is PT100, and the exhaust fan and temperature sensor are electrically connected with circuit element.
3. beneficial effect
Compared with the prior art, the present invention has the advantages that
(1) present invention inside heat dissipating layer by being arranged the first thermally conductive sheet, the second thermally conductive sheet and radiating fin and first thermally conductive Heat-conducting layer between piece and the second thermally conductive sheet can be shed the heat of filter box house to filtering by heat exchange pattern Outside device cabinet, by setting internal cavity and external cavity inside heat dissipating layer, through-hole is opened up among heat-conducting layer, it is thermally conductive second Venthole is opened up on the left of piece and right side opens up air inlet, when filter box house generates heat, interior external cavity generates the temperature difference, The air of interior external cavity is flowed by through-hole, carries out heat dissipation of ventilating, to solve general filter without radiator structure The problem of;
(2) conductive layer and electromagnetic sealing liner is arranged by the way that shielded layer is arranged inside heat dissipating layer in the present invention in shielded layer, When filter works, conductive layer is connected circuit element, and then generates shielding action to extraneous electromagnetism, by being arranged in conduction The insulating layer of layer outer surface can completely cut off conductive layer and heat dissipating layer, the generation of electric leakage accident be prevented, to solve common filter The poor problem of wave device shielding properties.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention;
Fig. 2 is the structural schematic diagram of filter box house of the present invention;
Fig. 3 is the structural schematic diagram of heat dissipating layer of the invention;
Fig. 4 is the structural schematic diagram of shielded layer of the invention.
Figure label explanation:
1- bottom plate;2- filter cabinet;3- pin;4- heat dissipating layer;5- shielded layer;6- circuit element;The first thermally conductive sheet of 7-;8- Two thermally conductive sheets;9- heat-conducting layer;10- through-hole;11- air inlet;12- venthole;13- internal cavity;14- external cavity;15- heat radiating fin Piece;16- insulating layer;17- conductive layer;18- electromagnetic sealing liner;19- mounting plate;20- screw hole;21- conducting wire;22- complex protection Layer;23- exhaust fan;24- temperature sensor.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention;Technical solution in the embodiment of the present invention carries out clear, complete Site preparation description;Obviously;Described embodiments are only a part of the embodiments of the present invention;Instead of all the embodiments.It is based on Embodiment in the present invention;It is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment;It shall fall within the protection scope of the present invention.
Fig. 1-4, a kind of filter, including bottom plate 1 are please referred to, filter cabinet 2 is fixedly connected with above bottom plate 1, is filtered 2 left and right sides of device cabinet is evenly spaced to be provided with several pins 3, and 2 inner surface of filter cabinet is provided with 4 He of heat dissipating layer Shielded layer 5, shielded layer 5 are fixedly connected on 4 inner surface of heat dissipating layer, and shielded layer 5 is internally provided with circuit element 6, and circuit element 6 is solid Surely it is connected to 1 top of bottom plate, pin 3 passes through filter cabinet 2 and circuit element 6 is electrically connected, and heat dissipating layer 4 includes first thermally conductive It is provided with heat-conducting layer 9 among piece 7 and the second thermally conductive sheet 8, the first thermally conductive sheet 7 and the second thermally conductive sheet 8,9 midfeather of heat-conducting layer is equal Even offers several through-holes 10, and 8 right side opening of the second thermally conductive sheet is equipped with air inlet 11, offers out on the left of the second thermally conductive sheet 8 It is provided with internal cavity 13 among stomata 12, the first thermally conductive sheet 7 and heat-conducting layer 9, is provided among the second thermally conductive sheet 8 and heat-conducting layer 9 External cavity 14,8 outer surface of the second thermally conductive sheet is evenly spaced to be fixedly connected with several radiating fins 15, and shielded layer 5 includes exhausted Edge layer 16,16 inner surface of insulating layer are fixedly connected with conductive layer 17, and the quadrangle of conductive layer 17 is fixedly connected to electromagnetic sealing lining Pad 18.
1 front and rear sides of filter cabinet are fixedly connected to mounting plate 19, and 19 left and right sides of mounting plate offers screw hole 20, filter can be fixed on device by screw by setting mounting plate 19 and screw hole 20, be arranged on the inside of conductive layer 17 There is conducting wire 21, conductive layer 17 and 21 one end of conducting wire are electrically connected, and 21 other end of conducting wire and circuit element 6 are electrically connected, by leading Conductive layer 17 and circuit element 6 are electrically connected by line 21, realize that conductive layer 17 is powered, outside conductive layer 17 and electromagnetic sealing liner 18 Surface is fixedly connected to composite protection layer 22, and 21 other end of conducting wire passes through composite protection layer 22 and circuit element 6 is electrically connected, Composite protection layer 22 can stop circuit element 6 directly to contact with conductive layer 17 and electromagnetic sealing liner 18, to protect circuit elements Part 6 is provided with exhaust fan 23 above venthole 12, temperature sensor 24 is fixedly connected with above bottom plate 1, wherein temperature sensor 24 model PT100, exhaust fan 23 and temperature sensor 24 are electrically connected with circuit element 6, when temperature sensor 24 detects When temperature is higher in filter cabinet 1, exhaust fan 23 is connected, the air between external cavity 14 and internal cavity 13 is accelerated to flow speed Degree improves radiating efficiency.
Working principle: screw is passed through the screw hole 20 on mounting plate 19 and is threadedly coupled fixation with device, will filtered by the first step The pin 3 and device of 2 left and right sides of device cabinet are electrically connected, second step, when filter is started to work, circuit element 6 and pin 3 Conducting, circuit element 6 is electrically connected by the conductive layer 17 inside conducting wire 21 and shielded layer 5, in conductive layer 17 and electromagnetic sealing Under the action of liner 18,2 pairs of filter cabinet extraneous electromagnetic signals produce certain shielding action, and third step works as filter When work, certain heat can be generated in filter cabinet 2, when the heat generated inside filter cabinet 2 is smaller, heat dissipating layer Internal cavity 13 inside 4 and the temperature difference that external cavity 14 generates are smaller, pass through the first thermally conductive sheet 7, the second thermally conductive sheet 8 and radiating fin 15 with the modes of heat transfer by outside heat transfer filter cabinet 2 inside to filter cabinet 2, due to internal cavity 13 with outside Cavity 14 has certain temperature difference, so that the air in external cavity 14 is exchanged by through-hole 10 with the air of internal cavity 13, into One step accelerates shedding for 2 internal heat of filter cabinet, when the heat that filter internal generates is more, the temperature of 1 top of bottom plate When degree sensor 24 detects that 2 internal temperature of filter cabinet is higher, the exhaust fan 23 being arranged at venthole 12 will turn on, lead to Crossing exhaust fan 23 accelerates the air between internal cavity 13 and external cavity 14 to flow, and accelerates filter heat dissipation;By being arranged in conduction The insulating layer 16 of 17 outer surface of layer, which can completely cut off conductive layer 17 and heat dissipating layer 4, come, and prevent electric leakage accident, by Conductive layer 17 and electromagnetic sealing pad 18 inner surfaces setting composite protection layer 22 and can separate conductive layer 17 and circuit element 6, To protect circuit element 6.
For better heat dissipation effect, shielded layer 5 is magnetic screen heat dissipating silicone grease coating, using load ferrite nano material Aluminium oxide be filler prepares coating, the exclusive metallic crystalline structure of powder body material makes it just be easy to shape under a small amount of additive amount At conductive network, and the excellent electric conductivity of compound nickel aluminium and ferritic magnetism combine, and coating can be made to be provided simultaneously with electrical loss And magnetic loss, it realizes the impedance matching of electromagnetic absorption, widens absorption frequency range, improve the absorbing property of single conductive filler;In addition, In the water-oil interface junction of sodium sulphate saturated solution and silicone oil, ethyl orthosilicate is reacted with water generates poly silicic acid, not only may be used To effectively improve the mechanical property of emulsifying film, avoid oozing out etching electronic prototype part because of sodium sulphate saturated solution, and positive silicic acid Ethyl ester reacts consumption part water with water, makes sodium sulphate saturated solution that a small amount of crystalline solid be precipitated, is conducive to sulphur in temperature elevation process Sour sodium rapid crystallization is precipitated, and forms the export that crystalline framework is conducive to heat, further promotes leading for electromagnetic shielding silicone grease coating Hot property, so that such composite coating structure guarantees that material is provided simultaneously with good thermal diffusivity and excellent electromagnetic wave shielding.
Embodiment 1
A kind of preparation method of magnetic screen heat dissipating silicone grease coating, it is characterised in that method includes the following steps:
Step 1 weighs 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 3 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Methyl-silicone oil and ethyl orthosilicate are placed in single-necked flask by step 2, and under the conditions of revolving speed is 600r/min, stirring is mixed 50min is closed, mixed liquor is obtained;
Gained mixed liquor and aluminium oxide/Ni ferrite composite granule are placed in batch mixer by step 3, in revolving speed be 1200r/min Under the conditions of, high-speed stirred 50min;
Sodium sulphate saturated solution and soybean lecithin is added in step 4 into batch mixer again, under the conditions of revolving speed is 1200r/min, after Continue high-speed stirred 50min to get magnetic screen heat dissipating silicone grease coating;
The aluminium oxide/Ni ferrite composite granule the preparation method is as follows:
Step 1, title remove 2.8 parts of FeCl3·6H2O and 1.8 part of NiCl2·6H2O is dissolved in 30 parts of water and is configured to solution, is added 12 In the alumina fluid dispersion of part 15g/L, ultrasonic 30min;
Step 2 adjusts pH=11 with sodium hydroxide solution, is eventually adding 1 part of reducing agent Na2S2O3·5H2O is packed into reaction kettle, close Envelope, is placed in baking oven, 150 DEG C of reaction 15h;
Solution after reaction is placed in Rotary Evaporators by step 3 again, is 120 DEG C, pressure 400kPa in temperature, revolving speed is Under the conditions of 60r/min, it is evaporated under reduced pressure 30min, obtains aluminium oxide/Ni ferrite composite granule;
Aluminium oxide/Ni ferrite composite granule is then placed in baking oven by step 4, under the conditions of temperature is 110 DEG C, dry 2h, Obtain dry aluminium oxide/Ni ferrite composite granule;
The alumina fluid dispersion is by 2 parts of aluminium oxide, and 1 part of silane resin acceptor kh-550 and 12 parts of dehydrated alcohols are placed in beaker In, in temperature be 80 DEG C, revolving speed be 600r/min under the conditions of, heating stirring 50min;Then it is added dropwise with rubber head dropper into beaker The sodium hydroxide solution that mass fraction is 10% adjusts pH=10, then places the beaker in ultrasonic disperse instrument, in frequency be 65kHz item Under part, ultrasonic disperse 50min;
Embodiment 2
Step 1 weighs 8 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 3 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;Remaining step is the same as embodiment 1.
Embodiment 3
Step 1 weighs 6 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 3 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 4
Step 1 weighs 4 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 3 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 5
Step 1 weighs 2 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 3 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 6
Step 1, to weigh 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 2.5 parts of aluminium oxide/Ni ferrites by weight compound Powder, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 7
Step 1 weighs 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 2 parts of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 8
Step 1, to weigh 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 1.5 parts of aluminium oxide/Ni ferrites by weight compound Powder, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 9
Step 1 weighs 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 1 part of aluminium oxide/Ni ferrite composite powder by weight Body, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Embodiment 10
Step 1, to weigh 10 parts of methyl-silicone oils, 3 parts of sodium sulphate saturated solutions, 0.5 part of aluminium oxide/Ni ferrite by weight compound Powder, 3 parts of soybean lecithins and 1 part of ethyl orthosilicate are spare;
Reference examples 1
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1, is replaced with the aluminium oxide of equivalent compound Powder, remaining step are identical with embodiment 1.
Reference examples 2
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1,1 part of aluminium oxide, 1 part of aluminium oxide and 1 Part nickel oxide substitutes 3 parts of aluminium oxide/Ni ferrite composite granule, remaining step is identical with embodiment 1.
Reference examples 3
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1, is taken with equivalent saturation calcium sulphate soln Generation saturation metabisulfite solution, remaining step are identical with embodiment 1.
Reference examples 4
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1, is taken with equivalent saturated sodium carbonate solution Generation saturation metabisulfite solution, remaining step are identical with embodiment 1.
Reference examples 5
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1, soybean lecithin and ethyl orthosilicate matter For amount than 1:1, remaining step is identical with embodiment 1.
Reference examples 6
It is with 1 difference of embodiment: in magnetic screen heat dissipating silicone grease coating preparation step 1, soybean lecithin and ethyl orthosilicate matter For amount than 1:3, remaining step is identical with embodiment 1.
Reference examples 7
It is with 1 difference of embodiment: in aluminium oxide/Ni ferrite composite granule preparation step 1, uses 4.6 parts of one pack systems FeCl3·6H2O;Remaining step is identical with embodiment 1.
Reference examples 8
It is with 1 difference of embodiment: in aluminium oxide/Ni ferrite composite granule preparation step 1, uses 4.6 parts of one pack systems NiCl2·6H2O;Remaining step is identical with embodiment 1.
Reference examples 9
It is with 1 difference of embodiment: in aluminium oxide/Ni ferrite composite granule preparation step 2, adjusts solution PH=7, remaining Step is identical with embodiment 1.
Reference examples 10
It is with 1 difference of embodiment: in aluminium oxide/Ni ferrite composite granule preparation step 2, adjusts solution PH=3, remaining Step is identical with embodiment 1.
The sample that specification is 22mm × 10mm thickness 1mm is tested in the electromagnetic shielding performance of 8-12GHz frequency range.Radio frequency electrical Magnetic field shielding efficiency is measured using Agilent 4396B network/spectrum/impedance analyzer, using SJ20524-1995 " material Expect shield effectiveness test method ";Thermal conductivity is tested by III thermal conductivity factor instrument of DRL-, and method is heat flow method, and testing standard is MIL-I-49456A;It is as shown in the table for test result
The experimental results showed that the magnetic screen heat dissipating silicone grease coating of preparation has good Magnetic Shielding Effectiveness, it is certain in test condition When, shield effectiveness (SE) is higher, and Magnetic Shielding Effectiveness is better, otherwise poorer;In methyl-silicone oil, aluminium oxide/Ni ferrite composite powder When body mass ratio is 10:3, other ingredients are fixed, and preparation effect is best, and reference examples 1 to reference examples 3 illustrate that composite granule compares Material magnetic shield performance influences very big;Reference examples 4 illustrate that the compound heat dissipation to material for being saturated metabisulfite solution is affected;It is right 5 to the change soybean lecithin of reference examples 6 and ethyl orthosilicate mass ratio as usual, so that water-oil interface property changes the dispersion effect of filler Fruit is deteriorated, and Magnetic Shielding Effectiveness is still bad;Reference examples 7 prepare composite granule using the metal salt solution of one-component to reference examples 8, Shield effectiveness is obviously deteriorated, and the nickel or iron of instruction sheet one are more preferable not as good as the compound effect of the two;Reference examples 9 to reference examples 10 reduce The pH value of reduction reaction system, the heat dissipation of coating and Magnetic Shielding Effectiveness are all very poor, illustrate reaction be more suitable under alkaline system into Row;Therefore there is good thermal diffusivity and effectiveness using magnetic screen heat dissipating silicone grease coating prepared by the present invention.

Claims (5)

1. a kind of filter, including bottom plate (1), it is characterised in that: be fixedly connected with filter cabinet above the bottom plate (1) (2), evenly spaced at left and right sides of the filter cabinet (2) to be provided with several pins (3), the filter cabinet (2) inner surface is provided with heat dissipating layer (4) and shielded layer (5), and the shielded layer (5) is fixedly connected on heat dissipating layer (4) inner surface, institute It states shielded layer (5) to be internally provided with circuit element (6), the circuit element (6) is fixedly connected on above bottom plate (1), described to draw Foot (3) passes through filter cabinet (2) and circuit element (6) and is electrically connected, the heat dissipating layer (4) include the first thermally conductive sheet (7) and Heat-conducting layer (9), the heat-conducting layer are provided among second thermally conductive sheet (8), first thermally conductive sheet (7) and the second thermally conductive sheet (8) (9) midfeather uniformly offers several through-holes (10), and the second thermally conductive sheet (8) right side opening is equipped with air inlet (11), It offers venthole (12) on the left of second thermally conductive sheet (8), is provided among first thermally conductive sheet (7) and heat-conducting layer (9) Internal cavity (13), second thermally conductive sheet (8) and heat-conducting layer (9) centre are provided with external cavity (14), second thermally conductive sheet (8) Outer surface is evenly spaced to be fixedly connected with several radiating fins (15), and the shielded layer (5) includes insulating layer (16), described Insulating layer (16) inner surface is fixedly connected with conductive layer (17), and the quadrangle of the conductive layer (17) is fixedly connected to electromagnetic sealing It pads (18).
2. according to claim 1 a kind of with radiator structure and with the filter of function of shielding, it is characterised in that: institute It states filter cabinet (1) front and rear sides to be fixedly connected to mounting plate (19), be offered at left and right sides of the mounting plate (19) Screw hole (20).
3. a kind of filter according to claim 1, it is characterised in that: be provided with conducting wire on the inside of the conductive layer (17) (21), the conductive layer (17) and conducting wire (21) one end are electrically connected, and conducting wire (21) other end and circuit element (6) are electrically Connection.
4. according to claim 1 with a kind of filter described in 3, it is characterised in that: the conductive layer (17) and electromagnetic sealing lining Pad (18) outer surface be fixedly connected to composite protection layer (22), conducting wire (21) other end pass through composite protection layer (22) with Circuit element (6) is electrically connected.
5. a kind of filter according to claim 1, it is characterised in that: be provided with exhaust fan above the venthole (12) (23), temperature sensor (24) are fixedly connected with above the bottom plate (1), wherein temperature sensor (24) model PT100, institute Exhaust fan (23) and temperature sensor (24) is stated to be electrically connected with circuit element (6).
CN201811112194.9A 2018-09-25 2018-09-25 A kind of filter Pending CN108934153A (en)

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CN109712777A (en) * 2019-02-26 2019-05-03 中国科学院上海微系统与信息技术研究所 The preparation method of filter, test macro and filter
CN110494029A (en) * 2019-08-27 2019-11-22 山东浪潮人工智能研究院有限公司 The shielding case and arbitrary waveform generator of board for arbitrary waveform generator
CN113098014A (en) * 2021-04-20 2021-07-09 中国人民解放军军事科学院国防工程研究院工程防护研究所 High-power broadband power filter
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