CN105182037A - Open-loop hall current sensor - Google Patents
Open-loop hall current sensor Download PDFInfo
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- CN105182037A CN105182037A CN201510478720.3A CN201510478720A CN105182037A CN 105182037 A CN105182037 A CN 105182037A CN 201510478720 A CN201510478720 A CN 201510478720A CN 105182037 A CN105182037 A CN 105182037A
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Abstract
Provided in the invention is an open-loop hall current sensor. With the sensor, a problem of weak anti-interference capability of the existing sensor is solved. The open-loop hall current sensor comprises an insulating housing; a mounting part is arranged at the end surface of the insulating housing; and a positioning part is arranged at the side wall of the insulating housing. The middle part of the insulating housing is hollowed to form an accommodation cavity; and an annular mounting part for installing a lead is arranged in the accommodation cavity. An annular magnetic core is arranged between the annular mounting part and the insulating housing; a notch penetrating the annular magnetic core is formed in the annular magnetic core; and the annular magnetic core and the annular mounting part are arranged coaxially. A hall element and a circuit board connected with the hall element are installed in the notch. A connecting hole is formed in the insulating housing; a connecting wire connected with the circuit board is arranged in the connecting hole; and a connecting sleeve is arranged between the connecting wire and the connecting hole. The annular mounting part is made of a polyformaldehyde composite material. The open-loop hall current sensor has advantages of high anti-interference capability and convenient installation.
Description
Technical field
The invention belongs to sensor technical field, relate to a kind of open loop Hall current sensor.
Background technology
Open loop Hall current sensor refers to based on Hall direct amplifier system principle of work, namely when primary current IP flows through a long lead, by generation one magnetic field around wire, the size in this magnetic field is directly proportional to the electric current flowing through wire, the magnetic field produced is gathered in magnet ring, undertaken measuring by hall device in magnet ring air gap and amplify output, its output voltage Vs reflects primary current Ip and accurately through the process of special circuit, for the detecting element of primary current change, Hall current sensor is widely used in RHVC, inverter, ups power, inverter type welder, metallide, numerically-controlled machine, microcomputer detecting system, grid monitoring system and needing in the every field of isolation detection current/voltage.But in prior art there is poor anti jamming capability, install inconvenient problem in Hall current sensor.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose the open-loop current sensor that a kind of antijamming capability is strong, easy for installation.
Object of the present invention realizes by following technical proposal: a kind of open loop Hall current sensor, comprise insulation shell, the end face of insulation shell arranges installation portion, installation portion offers mounting groove, offer in mounting groove and run through installation portion and for the mounting hole of mounting screw, the sidewall of insulation shell is provided with location division, hollow out at the middle part of insulation shell and be formed with container cavity, the annular installation portion for conducting wire is provided with in container cavity, toroidal core is provided with between annular installation portion and insulation shell, toroidal core offers the breach running through toroidal core, and described toroidal core and annular installation portion are coaxially arranged, the wiring board being provided with Hall element and being connected with Hall element in breach, insulation shell also offers connecting hole, the connecting line be connected with wiring board is provided with in connecting hole, and adapter sleeve is provided with between connecting line and connecting hole.
In above-mentioned a kind of open loop Hall current sensor, in container cavity, be also provided with the division board be connected with wiring board.
In above-mentioned a kind of open loop Hall current sensor, in container cavity, be filled with casting glue.
In above-mentioned a kind of open loop Hall current sensor, annular installation portion is made up of polyformaldehyde composite material.
In above-mentioned a kind of open loop Hall current sensor, polyformaldehyde composite material is become to be grouped into by following parts by weight: polyoxymethylene: 100 parts, fibrous material: 5-30 part, metal powder: 5-10 part, antistatic agent: 1-10 part, toughner: 5-15 part, fire retardant: 5-15 part, antioxidant: 1-5 part, formaldehyde absorbent: 1-5 part, fomic acid absorber: 1-5 part.
Polyformaldehyde material has well wear-resisting, noise reduction, subtracts the characteristics such as dry.Therefore, the present invention adopts polyformaldehyde composite material to prepare annular installation portion, can reduce the electric jamming of electrostatic because tested wire produces and noise further, improves antijamming capability.And, the present invention is composite a series of auxiliary agents such as fibrous material, metal powder, toughner, fire retardant, antistatic agent in polyoxymethylene matrix also, the final annular installation portion obtained is made to have higher intensity and hardness, good rigidly, good toughness, low-temperature impact resistance does not ftracture, wearing quality is good, good corrosion resistance, and creep resistance is good, good weatherability, the characteristic such as antistatic.
In above-mentioned a kind of open loop Hall element, antistatic agent is one or more in polyol esters of fatty acids, modified silicon oil, modified poly (ethylene glycol).The electrostatic hazard that engineering plastics in use produce can cause product rejection, even accidents caused, causes adverse consequences.In engineering plastics, antistatic the most frequently used method adds antistatic agent, but engineering plastics have respective structure and chemical characteristic, only has and select suitable antistatic agent just can get a desired effect.Polyoxymethylene polarity of the present invention is little, and crystallinity is high, with the poor compatibility of general Polymer-metallic Catalyst, therefore, and necessary careful selection antistatic agent, otherwise, the effect of running counter to desire can be played.Antistatic agent selected by the present invention all has good compatibility with polyoxymethylene, also can improve the antistatic effect of polyformaldehyde composite material.
In above-mentioned a kind of open loop Hall current sensor, fibrous material is one or both in glass fibre, carbon fiber.
In above-mentioned a kind of open loop Hall current sensor, metal powder is one or more in iron powder, copper powder, zinc powder.
Fibrous material and metal powder are mainly used in the mechanical property improving polyformaldehyde composite material, as: the pure shrinkage factor of pure polyoxymethylene (washing shrinkage) is 2%, adds fibrous material and strengthens post-shrinkage ratio about 0.6%.The notch impact strength of pure polyoxymethylene is at 7.6KJ/m
2, can 10KJ/m be reached after metal powder strengthens
2above.
In above-mentioned a kind of open loop Hall current sensor, the particle diameter of metal powder is 100-200nm.The addition of metal powder and particle diameter have larger impact for the performance that compound substance is final.If the addition of metal powder and size controlling were not at that time, not only can not play the effect of reinforced composite performance, the performance of compound substance can be reduced on the contrary.
In above-mentioned a kind of open loop Hall current sensor, toughner is through the coated nano inoganic particle of POE-g-MAH, and nano inoganic particle is one or more in nanomete talc powder, nano diatomite, nano titanium oxide, nano-calcium carbonate.Because polyoxymethylene crystallinity is higher, generally reach 70%-85%, crystal grain is comparatively large, and notch impact strength is lower, often ruptures in a brittle manner.Therefore, need to carry out toughening modifying to polyoxymethylene.The reinforced polyformaldehyde such as elastic body, inorganic rigid particle is generally adopted in prior art, although the toughness of compound substance effectively can be improved, but due to the addition of toughner and the problem such as the compatibility between polyoxymethylene and toughner is poor, cause cost higher but performance boost is not obvious.And the present invention adopts through the coated nano inorganic particle toughening polyoxymethylene of POE-g-MAH, not only there is with polyoxymethylene good compatibility, and toughening effect is remarkable, can also improve the rigidity of polyformaldehyde composite material.
In above-mentioned a kind of open loop Hall current sensor, fire retardant phosphorus-nitrogen combustion inhibitor.The oxygen index of polyoxymethylene is about 15%, lower than 18% of general macromolecular material, it is more incendive one in plastics, and, in combustion, due to the effect of formaldehyde gas, the speed of meeting accelerated combustion, and have melting drip phenomenon, therefore must carry out modification to the fire resistance of polyoxymethylene.But the thermal stability of polyoxymethylene is poor, is heated and easily decomposes, and decomposition product will speed up polyoxymethylene decomposition.Therefore, polyoxymethylene is harsher to the requirement of combustion adjuvant in molding process, and a small amount of fire retardant decomposes a large amount of decomposition that will cause polyformaldehyde material.In addition, the interpolation of too much fire retardant can cause the mechanical property of polyformaldehyde composite material significantly to reduce.Therefore, the selection of fire retardant has material impact for the final performance of polyformaldehyde composite material.In fire retardant of the prior art, the heat decomposition temperature of phosphorus-nitrogen combustion inhibitor comparatively mates with polyoxymethylene, and processing is stable, and fire retardant is in neutral or alkalescent, and fire retardant addition is few, is relatively applicable to the flame-retardant modified of polyoxymethylene.
In above-mentioned a kind of open loop Hall current sensor, antioxidant is commercially available common antioxidant.Comprise Hinered phenols antioxidant, phosphite ester kind antioxidant, suffocated amine antioxidant.
In above-mentioned a kind of open loop Hall current sensor, one or more in formaldehyde absorbent melamine, dicyandiamide, polyamide, polyurethane.
In above-mentioned a kind of open loop Hall current sensor, fomic acid absorber is one or more in sodium oxide molybdena, magnesium oxide, calcium silicate, magnesium hydroxide.
Polyoxymethylene molecular backbone is formed by connecting by single C-O key, because on polyoxymethylene molecular backbone, two adjacent oxygen atoms have stronger activation to methylene hydrogen atom, result in polyoxymethylene in melt-processed and use procedure, there is obvious depolymerization tendency, particularly large molecule very easily chain rupture under the effect being subject to heat, oxygen, stress, there is the degradation reaction of continuous piptonychia aldehyde, and decompose the formaldehyde that produces and promotion is decomposed by the micro-formic acid that generated by oxidation of formaldehyde, accelerate piptonychia aldehyde reaction, cause polyoxymethylene thermal stability poor.So the present invention adds above-mentioned antioxidant, formaldehyde absorbent and fomic acid absorber in polyoxymethylene matrix, improve the thermal stability of polyoxymethylene.
In above-mentioned a kind of open loop Hall current sensor, casting glue is polyurethane pouring sealant; Polyurethane pouring sealant is made up of component A and B component, and the weight ratio of component A and B component is 100:(30-50);
Wherein, component A is made up of following composition (with weight parts): polyvalent alcohol: 100 parts, flame-retardant additive: 30-50 part, heat filling: 60-100 part, reinforcing fiber: 10-30 part, defoamer: 1-3 part, chain extender: 1-5 part, catalyzer: 0.5-3 part, coupling agent: 3-10 part.
Casting glue be used for electronic devices and components bonding, sealing, embedding and coating protection.Waterproof and dampproof, dust-proof, insulation, heat conduction can be played after solidification, maintain secrecy, anticorrosion, heatproof, shockproof effect.Electron pouring sealant kind is very many, and wherein, polyurethane pouring sealant ambient temperature curable, avoids and cause damage and the hydraulic performance decline of electronics, electrical component owing to heating up in being heating and curing.Due to embedding solidification under room temperature, do not need the huge equipment that is heating and curing, thus, it is that electronics, electric parts are damp proof, the desirable Embedding Material of anti-corrosion treatment.
At present, existing polyurethane pouring sealant embedding is water-fast, mould proof, shockproof, transparent after solidifying, have excellent electrical insulating property, corrosion-free to electric elements, to metals such as steel, aluminium, copper, tin, and rubber, plastics, the material such as wooden have good cementability, electronic component that installment and debugging is good and circuit can be made by shake, the impact of burn into humidity and dust etc.But hardness and low strength, elasticity are general.
And, polyurethane pouring sealant of the present invention is applied in Hall current sensor, Hall current sensor in application process by impacts such as the impact of applied environment (as high voltage etc.) and self-heatings, a large amount of heat energy can be produced, if can not conduct in time and distribute, be prone to accidents.Therefore, polyurethane pouring sealant of the present invention possesses good heat conductivility and fire resistance at application needs.
Therefore, the present invention adjusts the constituent of polyurethane pouring sealant and parts by weight thereof again, adds the auxiliary agents such as heat filling, fire retardant, reinforcing fiber, to improve the weak point of existing polyurethane pouring sealant in component.
In above-mentioned a kind of open loop Hall current sensor, B component is isocyanates.
In above-mentioned a kind of open loop Hall current sensor, heat filling comprises metal oxide and nitride, and metal oxide and nitride ratio of weight and number are 1:(0.8-1.5).Metal oxide is Al
2o
3, one or more in ZnO, MgO, nitride is AlN, Si
3n
4, one or more in BN.Although prior art also has the record adding heat filling, heat filling interpolation in prior art is also unreasonable.Because the temperature conductivity after encapsulating polyurethane adhesive curing depends on consumption and the capacity of heat transmission of heat filling to a great extent.The coefficient of heat conductivity of above-mentioned metal oxide is between 30-40W/ (mK), and the coefficient of heat conductivity of nitride is between 120-150W/ (mK), the coefficient of heat conductivity difference of two kinds of heat fillings is comparatively large, and the temperature conductivity of metal oxide is much lower compared with the thermal conductivity of nitride.But its price is lower, wide material sources, and have excellent electrical insulation capability, and research finds, when heat filling is greater than 100 with the ratio of matrix coefficient of heat conductivity, the coefficient of heat conductivity meaning continuing to improve heat filling is little.Therefore, rationally composite two kinds of heat fillings, can obtain good heat-conducting effect and economic effect.Therefore, the present invention using after above-mentioned metal oxide and nitride mix according to the above ratio as heat filling.
Heat filling is very large for the impact of final heat-conducting effect in consumption, if heat filling consumption is less, heat filling can not contact with each other and interact to each other, and temperature conductivity can not improve or improve and not obvious.Must contact with each other and interact between heat filling, could form the heat conduction network chain of similar netted or chain structure form in system, temperature conductivity could obtain raising.Certainly, heat filling consumption also has certain limit, not only exceed this limit can not continue improve temperature conductivity, also can reduce mechanical property.
The shape, size etc. of heat filling also have certain influence factor for temperature conductivity.When heat filling is Powdered, fills nano level heat filling effect and be better than the effect of filling micron-sized heat filling; When heat filling is threadiness, the heat filling of different-diameter, length-diameter ratio is different to the raising effect of temperature conductivity.Further, when heat filling is filled with Powdered and fibrous mixing, compared with the filler of single shape, the performances such as its temperature conductivity, mobility and intensity all can obtain larger improvement, thus, the use amount of heat filling can be reduced, to balance final physical and mechanical properties.Therefore, the present invention further preferred heat filling is Powdered and fibrous mixing, and the particle diameter of Powdered heat filling is 300-500nm, and the diameter of fibrous heat filling is 200-500nm, and length-diameter ratio is (30-50): 1.
In above-mentioned a kind of open loop Hall current sensor, reinforcing fiber is one or both in carbon fiber, glass fibre.The coefficient of heat conductivity of reinforcing fiber is mostly in 5W/ (mK) left and right, not effect is improved to temperature conductivity, but, add reinforcing fiber and can subtract closely spaced existence, after making encapsulating polyurethane adhesive curing, there is the performances such as more excellent creep resistant, stretching and bending strength, improve physical and mechanical properties.
In above-mentioned a kind of open loop Hall current sensor, flame-retardant additive is three (2-chloropropyl) phosphate.Simultaneously containing phosphorus, chlorine two kinds of elements in three (2-chloropropyl) phosphate molecule, fire resistance shows, and also have plasticising, protection against the tide, the effect such as antistatic, resultant effect is remarkable simultaneously.
As preferably, the present invention also added coupling agent in component, and coupling agent can be commercially available common coupling agent.Add coupling agent mainly in order to reinforcing fiber and heat filling can better be scattered in matrix.
As preferably, the present invention also added defoamer in component, and defoamer is preferably mineral oil defoaming agent.If the present invention adopts silicone based defoamer final effect obviously will be weaker than the effect adopting mineral oil defoaming agent.
As preferably, the present invention also added chain extender in component, and chain extender is the one in dibasic alcohol or diamine.
As preferably, the present invention also added catalyzer in component, and catalyzer is one or more in organic tin catalyzer, amines catalyst.
As preferably, polyurethane pouring sealant of the present invention in use, first obtain component A by the constituent of said components A and parts by weight proportioning thereof, component A obtains polyurethane pouring sealant with B component by weight proportioning again, then polyurethane pouring sealant is poured into a mould, at room temperature solidify after casting complete.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention includes insulation shell, be formed with installation portion and location division in the convex outer surfaces of insulation shell, facilitate the installation of staff, improve precision and the installation effectiveness of installation.
2, hollow out at the middle part of insulation shell and be formed with container cavity, the annular installation portion for conducting wire is provided with in container cavity, tool toroidal core jaggy is provided with between annular installation portion and insulation shell, in breach, Hall element is installed, and there is uniform spacing between annular installation portion and toroidal core, thus ensure that the electric jamming of electrostatic and the noise that can reduce because tested wire produces, improve antijamming capability.
3. the present invention's annular installation portion by having wear-resisting, noise reduction, the polyformaldehyde composite material that subtracts the characteristic such as dry makes, the electric jamming of electrostatic because tested wire produces and noise can be reduced further, improve antijamming capability.
4. the characteristics such as polyformaldehyde composite material of the present invention is rationally composite, and have higher intensity and hardness, good rigidly, good toughness, low-temperature impact resistance does not ftracture, and wearing quality is good, good corrosion resistance, and creep resistance is good, good weatherability, antistatic.
5. can play waterproof and dampproof, dust-proof, insulation, heat conduction after encapsulating polyurethane adhesive curing of the present invention, maintain secrecy, anticorrosion, heatproof, shockproof effect.
6. after encapsulating polyurethane adhesive curing of the present invention, hardness and moderate strength, good springiness, heat conductivility and fire resistance are better, and security performance is high, and serviceable life is of a specified duration.
Accompanying drawing explanation
Fig. 1 is cut-open view of the present invention.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the structural representation at another visual angle of the present invention.
In figure, 100, insulation shell; 110, installation portion; 111, mounting groove; 112, mounting hole; 120, location division; 200, annular installation portion; 300, toroidal core; 400, wiring board; 500, division board; 600, connecting line; 610, adapter sleeve; 700, casting glue.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1 to Figure 3, this open loop Hall element comprises insulation shell 100, the end face of insulation shell 100 arranges installation portion 110, installation portion 110 offers mounting groove 111, offer in mounting groove 111 and run through installation portion 110 and for the mounting hole 112 of mounting screw, the sidewall of insulation shell 100 is provided with location division 120, hollow out at the middle part of insulation shell 100 and be formed with container cavity, the annular installation portion 200 for conducting wire is provided with in container cavity, toroidal core 300 is provided with between annular installation portion 200 and insulation shell 100, and described toroidal core 300 and annular installation portion 200 are coaxially arranged, toroidal core 300 offers the breach running through annular magnet 300, the wiring board 400 being provided with Hall element and being connected with Hall element in breach, insulation shell 100 also offers connecting hole, the connecting line 600 be connected with wiring board 400 is provided with in connecting hole, and adapter sleeve 610 is provided with between connecting line 600 and connecting hole, the setting of adapter sleeve 610 improves the stability be connected between connecting line 600 with wiring board 400, avoid and occur to rupture between connecting line 600 and wiring board 400 and affect the generation of the normal work phenomenon of sensor.
Above-mentioned annular installation portion 200 and toroidal core 300 are coaxially arranged, thus spacing between annular installation portion 200 and toroidal core 300 is equal everywhere, reduce the electric jamming of electrostatic because tested wire produces and noise, improve antijamming capability.
Preferably, insulation shell 100 is provided with location division 120, Hall element realizes locating accurately by location division 120 in the process of installing, and improves positioning precision and the installation effectiveness of Hall element.
Further, above-mentioned installation portion 110 offers mounting groove 111, offer in mounting groove 111 and run through installation portion 110 and mounting hole 112 for installing dog screw, thus Hall element is installed in relevant devices by dog screw, ensure that the steadiness that Hall element is installed.
Hollow out in the middle part of above-mentioned insulation shell 100 and be formed with container cavity, and the annular installation portion 200 be provided with in container cavity for installing tested wire, thus annular container cavity is formed between annular installation portion 200 and insulation shell 100, tool toroidal core 300 jaggy is provided with in annular container cavity, and Hall element is provided with in the breach of toroidal core 300, thus when tested guiding is installed in annular installation portion 200, the magnetic field that Hall element can produce according to tested wire and produce corresponding output signal, staff can measure according to the output signal of correspondence.
Preferably, the wiring board 400 be connected with connector with Hall element respectively is also provided with in annular container cavity, in the process of work, the output signal that Hall element produces can be passed on wiring board 400, electric potential difference can scale up and finally be passed on connector by wiring board 400, wiring board 400 the output signal can amplified Hall element and produce is set, thus improve the accuracy that output signal that Hall element produces measures.
Further, the division board 500 be connected with toroidal core 300 is also provided with in container cavity, above-mentioned wiring board 400 is arranged between division board 500 and magnetic core, division board 500 can make to there is uniform spacing between toroidal core 300 and annular installation portion 200, thus ensure that the electric jamming of electrostatic and the noise that can reduce because tested wire produces, improve antijamming capability, improve the accuracy that Hall element is measured.
Casting glue 700 is filled with in annular container cavity, thus ensure that the steadiness that toroidal core 300, wiring board 400 and division board 500 are installed and impact resistance, casting glue 700 has insulativity simultaneously, thus extraneous factor can be avoided the impact of Hall element measurement accuracy, improve the antijamming capability of Hall element.
Further, above-mentioned annular installation portion 200 is made up of polyformaldehyde composite material.
Further, polyformaldehyde composite material is become to be grouped into by following parts by weight: polyoxymethylene: 100 parts, fibrous material: 5-30 part, metal powder: 5-10 part, antistatic agent: 1-10 part, toughner: 5-15 part, fire retardant: 5-15 part, antioxidant: 1-5 part, formaldehyde absorbent: 1-5 part, fomic acid absorber: 1-5 part.
Further, casting glue 700 is polyurethane pouring sealant.
Further, polyurethane pouring sealant is made up of component A and B component, and the weight ratio of component A and B component is 100:(30-50);
Wherein, component A is made up of following composition (with weight parts): polyvalent alcohol: 100 parts, flame-retardant additive: 30-50 part, heat filling: 60-100 part, reinforcing fiber: 10-30 part, defoamer: 1-3 part, chain extender: 1-5 part, catalyzer: 0.5-3 part, coupling agent: 3-10 part.
Annular installation portion prepares embodiment
The constituent of the annular installation portion of table 1: embodiment 1-5 and parts by weight (part) thereof
Embodiment 1:
Raw material is taken by the constituent of the annular installation portion of embodiment in table 11 and parts by weight thereof.Wherein, fibrous material is carbon fiber, the iron powder of metal powder to be particle diameter be 150nm, antistatic agent is polyol esters of fatty acids, toughner is the coated nano-calcium carbonate of POE-g-MAH, and fire retardant is phosphorus-nitrogen combustion inhibitor, formaldehyde absorbent melamine, fomic acid absorber is sodium oxide molybdena, and antioxidant is commercially available antioxidant.
During preparation, by injection moulding, extrude, extrusion or blowing obtains annular installation portion.
Embodiment 2:
Raw material is taken by the constituent of the annular installation portion of embodiment in table 12 and parts by weight thereof.Wherein, fibrous material is carbon fiber, the iron powder of metal powder to be particle diameter be 150nm, antistatic agent is polyol esters of fatty acids, toughner is the coated nano-calcium carbonate of POE-g-MAH, and fire retardant is phosphorus-nitrogen combustion inhibitor, formaldehyde absorbent melamine, fomic acid absorber is sodium oxide molybdena, and antioxidant is commercially available antioxidant.
During preparation, by injection moulding, extrude, extrusion or blowing obtains annular installation portion.
Embodiment 3:
Raw material is taken by the constituent of the annular installation portion of embodiment in table 13 and parts by weight thereof.Wherein, fibrous material is carbon fiber, the iron powder of metal powder to be particle diameter be 150nm, antistatic agent is polyol esters of fatty acids, toughner is the coated nano-calcium carbonate of POE-g-MAH, and fire retardant is phosphorus-nitrogen combustion inhibitor, formaldehyde absorbent melamine, fomic acid absorber is sodium oxide molybdena, and antioxidant is commercially available antioxidant.
During preparation, by injection moulding, extrude, extrusion or blowing obtains annular installation portion.
Embodiment 4:
Raw material is taken by the constituent of the annular installation portion of embodiment in table 14 and parts by weight thereof.Wherein, fibrous material is carbon fiber, the iron powder of metal powder to be particle diameter be 150nm, antistatic agent is polyol esters of fatty acids, toughner is the coated nano-calcium carbonate of POE-g-MAH, and fire retardant is phosphorus-nitrogen combustion inhibitor, formaldehyde absorbent melamine, fomic acid absorber is sodium oxide molybdena, and antioxidant is commercially available antioxidant.
During preparation, by injection moulding, extrude, extrusion or blowing obtains annular installation portion.
Embodiment 5:
Raw material is taken by the constituent of the annular installation portion of embodiment in table 15 and parts by weight thereof.Wherein, fibrous material is carbon fiber, the iron powder of metal powder to be particle diameter be 150nm, antistatic agent is polyol esters of fatty acids, toughner is the coated nano-calcium carbonate of POE-g-MAH, and fire retardant is phosphorus-nitrogen combustion inhibitor, formaldehyde absorbent melamine, fomic acid absorber is sodium oxide molybdena, and antioxidant is commercially available antioxidant.
During preparation, by injection moulding, extrude, extrusion or blowing obtains annular installation portion.
Comparative example 1 is only with the difference of embodiment 3, and in comparative example 1, the particle diameter of metal powder is 1 μm.
Comparative example 2 is only with the difference of embodiment 3, and in comparative example 2, the addition of metal powder is 3 parts.
Comparative example 3 is only with the difference of embodiment 3, and in comparative example 3, the addition of metal powder is 12 parts.
Comparative example 4 is only with the difference of embodiment 3, and in comparative example 4, toughner is conventional elastomers toughner.
Comparative example 5 is only with the difference of embodiment 3, and in comparative example 5, toughner is the agent of common inorganic Rigid Particles Toughened.
Comparative example 6 is only with the difference of embodiment 3, and in comparative example 6, fire retardant is inorganic hydroxide fire retardant.
The annular installation portion that embodiment 1-5 and comparative example 1-6 is obtained carries out performance test, and test result is as shown in table 2.
Table 2
As known from Table 2, annular installation portion physical property, mechanical property and the electric property etc. that obtain of the present invention are all better.
In above-mentioned annular installation portion embodiment and alternative thereof, the particle diameter of metal powder can also be 100nm, 110nm, 120nm, 130nm, 140nm, 160nm, 170nm, 180nm, 190nm, 200nm.
In above-mentioned annular installation portion embodiment and alternative thereof, fibrous material can also be glass fibre, and the mixing of carbon fiber and glass fibre.
In above-mentioned annular installation portion embodiment and alternative thereof, metal powder can also be copper powder, zinc powder, and iron powder with between copper powder with zinc powder any two kinds mix or three kinds mix.
In above-mentioned annular installation portion embodiment and alternative thereof, antistatic agent can also be modified silicon oil, modified poly (ethylene glycol), and polyol esters of fatty acids with between modified silicon oil with modified poly (ethylene glycol) any two kinds mix or three kinds mix.
In above-mentioned annular installation portion embodiment and alternative thereof, toughner can also be the coated nano titanium oxide of the coated nano diatomite of the coated nanomete talc powder of POE-g-MAH, POE-g-MAH, POE-g-MAH, and between the coated nano-calcium carbonate of the POE-g-MAH nanomete talc powder coated with the POE-g-MAH nano diatomite coated with the POE-g-MAH nano titanium oxide coated with POE-g-MAH any two kinds mix any three kinds mix or four kinds mix.
In above-mentioned annular installation portion embodiment and alternative thereof, formaldehyde absorbent can also be dicyandiamide, polyamide, polyurethane, and melamine and dicyandiamide with between polyamide with polyurethane any two kinds mix any three kinds mix or four kinds mix.
In above-mentioned annular installation portion embodiment and alternative thereof, fomic acid absorber can also be magnesium oxide, calcium silicate, magnesium hydroxide, and sodium oxide molybdena and magnesium oxide with between calcium silicate with magnesium hydroxide any two kinds mix any three kinds mix or four kinds mix.
In view of the present invention's annular installation portion Solution Embodiments is numerous, annular installation portion each embodiment experimental data is huge numerous, be not suitable for particularize explanation herein, but the content of the required checking of each embodiment of annular installation portion is all close with the final conclusion obtained, so do not illustrate one by one the checking content of annular each embodiment of installation portion, only with annular installation portion embodiment 1-5, the excellent part of the present patent application is representatively described herein.
Casting glue prepares embodiment
Table 3: the constituent of polyurethane pouring sealant component A and parts by weight (part) thereof
Embodiment 1:
First obtain component A by the constituent of embodiment in table 31 component A and parts by weight proportioning thereof, wherein in constituent, flame-retardant additive is three (2-chloropropyl) phosphate, reinforcing fiber is carbon fiber, defoamer is mineral oil defoaming agent, chain extender is dibasic alcohol, catalyzer is organic tin catalyzer, and coupling agent is commercial silanes coupling agent, and the particle diameter that heat filling is 1:1 by ratio of weight and number is the Powdered Al of 300nm
2o
3be 200nm with diameter, length-diameter ratio is the fibrous AlN composition of 30:1.
Component A after said ratio completes obtains polyurethane pouring sealant with B component isocyanates by weight 100:40 proportioning again, is then poured into a mould by polyurethane pouring sealant, at room temperature solidifies after casting complete.
Embodiment 2:
First obtain component A by the constituent of embodiment in table 32 component A and parts by weight proportioning thereof, wherein in constituent, flame-retardant additive is three (2-chloropropyl) phosphate, reinforcing fiber is carbon fiber, defoamer is mineral oil defoaming agent, chain extender is dibasic alcohol, catalyzer is organic tin catalyzer, and coupling agent is commercial silanes coupling agent, and the particle diameter that heat filling is 1:1 by ratio of weight and number is the Powdered Al of 300nm
2o
3be 200nm with diameter, length-diameter ratio is the fibrous AlN composition of 30:1.
Component A after said ratio completes obtains polyurethane pouring sealant with B component isocyanates by weight 100:40 proportioning again, is then poured into a mould by polyurethane pouring sealant, at room temperature solidifies after casting complete.
Embodiment 3:
First obtain component A by the constituent of embodiment in table 33 component A and parts by weight proportioning thereof, wherein in constituent, flame-retardant additive is three (2-chloropropyl) phosphate, reinforcing fiber is carbon fiber, defoamer is mineral oil defoaming agent, chain extender is dibasic alcohol, catalyzer is organic tin catalyzer, and coupling agent is commercial silanes coupling agent, and the particle diameter that heat filling is 1:1 by ratio of weight and number is the Powdered Al of 300nm
2o
3be 200nm with diameter, length-diameter ratio is the fibrous AlN composition of 30:1.
Component A after said ratio completes obtains polyurethane pouring sealant with B component isocyanates by weight 100:40 proportioning again, is then poured into a mould by polyurethane pouring sealant, at room temperature solidifies after casting complete.
Embodiment 4:
First obtain component A by the constituent of embodiment in table 34 component A and parts by weight proportioning thereof, wherein in constituent, flame-retardant additive is three (2-chloropropyl) phosphate, reinforcing fiber is carbon fiber, defoamer is mineral oil defoaming agent, chain extender is dibasic alcohol, catalyzer is organic tin catalyzer, and coupling agent is commercial silanes coupling agent, and the particle diameter that heat filling is 1:1 by ratio of weight and number is the Powdered Al of 300nm
2o
3be 200nm with diameter, length-diameter ratio is the fibrous AlN composition of 30:1.
Component A after said ratio completes obtains polyurethane pouring sealant with B component isocyanates by weight 100:40 proportioning again, is then poured into a mould by polyurethane pouring sealant, at room temperature solidifies after casting complete.
Embodiment 5:
First obtain component A by the constituent of embodiment in table 35 component A and parts by weight proportioning thereof, wherein in constituent, flame-retardant additive is three (2-chloropropyl) phosphate, reinforcing fiber is carbon fiber, defoamer is mineral oil defoaming agent, chain extender is dibasic alcohol, catalyzer is organic tin catalyzer, and coupling agent is commercial silanes coupling agent, and the particle diameter that heat filling is 1:1 by ratio of weight and number is the Powdered Al of 300nm
2o
3be 200nm with diameter, length-diameter ratio is the fibrous AlN composition of 30:1.
Component A after said ratio completes obtains polyurethane pouring sealant with B component isocyanates by weight 100:40 proportioning again, is then poured into a mould by polyurethane pouring sealant, at room temperature solidifies after casting complete.
Comparative example 1 is only with the difference of embodiment 3, and in comparative example 1, the addition of heat filling is 50 parts.
Comparative example 2 is only with the difference of embodiment 3, and in comparative example 2, heat filling is Powdered.
Comparative example 3 is only with the difference of embodiment 3, and in comparative example 3, heat filling is threadiness.
Comparative example 4 is only with the difference of embodiment 3, does not add reinforcing fiber in comparative example 4.
Comparative example 5 is only with the difference of embodiment 3, does not add flame-retardant additive in comparative example 5.
Comparative example 6 is only with the difference of embodiment 3, and in comparative example 6, flame-retardant additive is aluminium hydroxide.
Comparative example 7 is only with the difference of embodiment 3, and in comparative example 7, defoamer is silicone based defoamer.
Comparative example 8 is only with the difference of embodiment 3, and in comparative example 8, the weight ratio of component A and B component is 100:20.
Polyurethane pouring sealant after above-described embodiment 1-5 and comparative example 1-8 solidification is carried out performance test, and test result is as shown in table 4.
Table 4
As known from Table 4, after the encapsulating polyurethane adhesive curing of the present invention's formula, mechanical property, heat conductivility are better, and rapid heat dissipation, security is high.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and the weight ratio of heat filling can also be 1:0.8,1:0.9,1:1.1,1:1.2,1:1.3,1:1.4,1:1.5.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and in heat filling, metal oxide can also be ZnO, MgO, Al
2o
3with the mixing of ZnO, Al
2o
3with the mixing of MgO, the mixing of ZnO and MgO, Al
2o
3with mixing of ZnO and MgO.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and in heat filling, nitride can also be Si
3n
4, BN, AlN and Si
3n
4mixing, the mixing of AlN and BN, Si
3n
4with the mixing of BN, AlN and Si
3n
4with mixing of BN.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and the particle diameter of Powdered heat filling can also be 310nm, 320nm, 330nm, 340nm, 350nm, 360nm, 370nm, 380nm, 390nm, 400nm, 410nm, 420nm, 430nm, 440nm, 450nm, 460nm, 470nm, 480nm, 490nm, 500nm.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and the diameter of fibrous heat filling can also be 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, and length-diameter ratio can also be 30:1,35:1,40:1,45:1,50:1.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, can also nitride be Powdered in heat filling, and metal oxide is threadiness.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and reinforcing fiber can also be glass fibre.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and chain extender can also be diamine.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and catalyzer can also be amines catalyst.
Above-mentioned casting glue is prepared in embodiment and alternative thereof, and the weight ratio of component A and B component can also be 100:30,100:35,100:38,100:42,100:45,100:50.
In view of casting glue Solution Embodiments of the present invention is numerous, casting glue each embodiment experimental data is huge numerous, be not suitable for particularize explanation herein, but the content of the required checking of each embodiment of casting glue is all close with the final conclusion obtained, so do not illustrate one by one the checking content of each embodiment of casting glue herein, only prepare embodiment 1-5 with casting glue and the excellent part of the present patent application is representatively described.
The non-limit part of technical scope midrange that this place embodiment is protected application claims, equally all in the scope of protection of present invention.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (10)
1. an open loop Hall current sensor, comprise insulation shell, it is characterized in that, the end face of insulation shell arranges installation portion, installation portion offers mounting groove, offer in mounting groove and run through installation portion and for the mounting hole of mounting screw, the sidewall of insulation shell is provided with location division, hollow out at the middle part of insulation shell and be formed with container cavity, the annular installation portion for conducting wire is provided with in container cavity, toroidal core is provided with between annular installation portion and insulation shell, toroidal core offers the breach running through toroidal core, and described toroidal core and annular installation portion are coaxially arranged, the wiring board being provided with Hall element and being connected with Hall element in breach, insulation shell also offers connecting hole, the connecting line be connected with wiring board is provided with in connecting hole, and adapter sleeve is provided with between connecting line and connecting hole.
2. a kind of open loop Hall current sensor according to claim 1, is characterized in that, be also provided with the division board be connected with wiring board in container cavity.
3. a kind of open loop Hall current sensor according to claim 2, is characterized in that, in container cavity, be filled with casting glue.
4. a kind of open loop Hall current sensor according to claim 1, is characterized in that, described annular installation portion is made up of polyformaldehyde composite material.
5. a kind of open loop Hall current sensor according to claim 4, it is characterized in that, described polyformaldehyde composite material is become to be grouped into by following parts by weight: polyoxymethylene: 100 parts, fibrous material: 5-30 part, metal powder: 5-10 part, antistatic agent: 1-10 part, toughner: 5-15 part, fire retardant: 5-15 part, antioxidant: 1-5 part, formaldehyde absorbent: 1-5 part, fomic acid absorber: 1-5 part.
6. a kind of open loop Hall current sensor according to claim 5, is characterized in that, the particle diameter of described metal powder is 100-200nm.
7. a kind of open loop Hall current sensor according to claim 5, is characterized in that, described toughner is through the coated nano inoganic particle of POE-g-MAH.
8. a kind of open loop Hall current sensor according to claim 3, is characterized in that, described casting glue is polyurethane pouring sealant; Described polyurethane pouring sealant is made up of component A and B component, and the weight ratio of described component A and B component is 100:(30-50);
Wherein, described component A is made up of following composition (with weight parts): polyvalent alcohol: 100 parts, flame-retardant additive: 30-50 part, heat filling: 60-100 part, reinforcing fiber: 10-30 part, defoamer: 1-3 part, chain extender: 1-5 part, catalyzer: 0.5-3 part, coupling agent: 3-10 part.
9. a kind of open loop Hall current sensor according to claim 8, is characterized in that, described B component is isocyanates.
10. a kind of open loop Hall current sensor according to claim 8, it is characterized in that, described heat filling comprises metal oxide and nitride, and described metal oxide and nitride ratio of weight and number are 1:(0.8-1.5).
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| CN201510478720.3A CN105182037A (en) | 2015-08-07 | 2015-08-07 | Open-loop hall current sensor |
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|---|---|---|---|
| CN201510478720.3A CN105182037A (en) | 2015-08-07 | 2015-08-07 | Open-loop hall current sensor |
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| CN105954560A (en) * | 2016-05-23 | 2016-09-21 | 宁波锦澄电子科技股份有限公司 | Small-signal high-precision open-loop Hall current sensor |
| CN107240492A (en) * | 2017-08-13 | 2017-10-10 | 安徽君华舜义恩佳非晶材料有限公司 | A kind of non-crystaline amorphous metal current transformer being easily assembled to |
| CN108120865A (en) * | 2017-12-18 | 2018-06-05 | 海宁天悦电子有限公司 | A kind of high sensitivity safety electric flow sensor |
| CN108663559A (en) * | 2017-03-27 | 2018-10-16 | 株式会社田村制作所 | Current detector |
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| CN202256455U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Magnetic balance type Hall current sensor |
| CN103524698A (en) * | 2013-08-27 | 2014-01-22 | 福建瑞森化工有限公司 | Halogen-free flame retardant heat conduction polyurethane pouring sealant and preparation method thereof |
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| CN108663559A (en) * | 2017-03-27 | 2018-10-16 | 株式会社田村制作所 | Current detector |
| CN107240492A (en) * | 2017-08-13 | 2017-10-10 | 安徽君华舜义恩佳非晶材料有限公司 | A kind of non-crystaline amorphous metal current transformer being easily assembled to |
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| CN108120865A (en) * | 2017-12-18 | 2018-06-05 | 海宁天悦电子有限公司 | A kind of high sensitivity safety electric flow sensor |
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Application publication date: 20151223 |