CN2757139Y

CN2757139Y - Clamp type sensor for multilayer shield

Info

Publication number: CN2757139Y
Application number: CN 200420114523
Authority: CN
Inventors: 朱强; 胡瑞华; 曾志海
Original assignee: SHANGHAI ELECTRIC TOOL RESEARCH INSTITUTE
Current assignee: SHANGHAI ELECTRIC TOOL RESEARCH INSTITUTE
Priority date: 2004-12-21
Filing date: 2004-12-21
Publication date: 2006-02-08
Anticipated expiration: 2014-12-21

Abstract

The utility model relates to a clamp type sensor for multilayer shields, which comprises a probe case and an iron core, wherein the iron core is arranged in the probe case. The utility model is characterized in that at least two shielding layers are arranged between the iron core and the outer wall of the probe case, each shielding layer is corresponding to different or same grounding and silica gel is filled among each shielding layer. The utility model has the advantage that the clamp type sensor can measure weak electric signals.

Description

A kind of clip style sensor of multilayer screen

Technical field

The utility model relates to a kind of clip style sensor of multilayer screen, can detect the low electric current that reaches 1mA, can follow the tracks of the waveform of the tested electric current of the true reflection of output, can be applicable to carry out the occasion of noncontact current/voltage signal testing, belong to sensor technical field.

Background technology

Traditional clip style sensor is made up of iron core, shell at present, and it has following shortcoming:

1. what traditional sensors probe adopted is the direct-coupled method of iron core, without screen layer or only use one deck screen layer, so very easily be subjected to the interference of external electromagnetic field, the serious distortion of the waveform of sensing when measuring feeble signal;

2. traditional split-core type meter jaw iron core uses silicon steel material, because the density of siliconized plate is bigger, and the antisaturation poor performance, its Effective permeability is low, and the split-core type meter of making like this is heavier, and measuring accuracy also is subjected to certain influence;

3. traditional sensor jaw adopts mechanical parts fixedly to aim at iron core more, adopts the tangent plane goodness of fit of this mode iron core to be subjected to certain influence, after long-time the use, can produce distortion, influences transmission performance;

4. traditional sensor jaw is round, and round jaw inconvenience is measured on the flat lead than broad.

Summary of the invention

The purpose of this utility model provides a kind of can be in the external world dried clip style sensor of measuring the multilayer screen of little electric quantity signal under the environment of scratching.

In order to achieve the above object, solution of the present utility model provides a kind of clip style sensor of multilayer screen, comprise probe shell, iron core, iron core places in the probe shell, it is characterized in that, at least be equipped with two-layer screen layer between iron core and the probe shell outer wall, each screen layer is equipped with filling gel to similar and different ground connection should be arranged between each screen layer.

Described probe shell, iron core are oval.

Described iron core can be iron, siliconized plate, permalloy and magnetic, Ferrite Material.

The utility model has the advantages that:

1. adopt two-layer at least shield technology

Because therefore stronger electric field and the magnetic interference of extraneous existence when using at the instrument scene must add shielding measure in the iron core outside:

(1) electric field shielding uses the metallic object parcel or the isolation signals transmission line of ground connection, and metallic object can be very thin metal forming, but good ground connection must be arranged.

(2) magnetic field shielding is when field frequency is relatively lower, below 100kHz, the present invention adopts ferrimagnet such as iron, siliconized plate, permalloy etc. to carry out magnetic field shielding, the magnetic permeability of ferromagnetic material is very big, so can concentrate on its inside to the magnetic line of force passes through, the high frequency magnetic field shielding material adopts metal good conductor, for example copper, aluminium etc.When passing sheet metal, high frequency magnetic field on sheet metal, produces induction electromotive force, because the conductivity of sheet metal is very high, so produce very big eddy current, eddy current produces counter magnetic field again, cancel out each other with the former magnetic field of passing sheet metal, increased simultaneously sheet metal former magnetic field on every side again, the magnetic line of force is detoured and mistake around sheet metal.

The utility model has adopted the multiple shield method, this multiple shield layer has adopted different metal materials, wherein pure iron shielding material adopts the super electrical pure iron plate of no timeliness, the control of magnetic shielding component shaping craft precision is strict, the fit dimension precision, magnetic shielding material is handled and is adopted high-purity hydrogen annealing process or high vacuum annealing process, magnetic property is first-class, utilize their characteristics separately that magnetic field and electric field are isolated respectively, formed electric field, the multiple shield in magnetic field, can effectively shield the interference in external electrical field and magnetic field, shield effectiveness is more than 60dB, even can operate as normal in the environment of the transformer station of 500,000 bigger KV of electromagnetic interference (EMI), the waveform of sensing almost have distortion yet.

The assembly unit of radome: in advance each piece sheet material is processed according to diagram, heat-treated, install then.Splicing place of every block of sheet material will weld, so that form continuous flux path.The screened room of Gou Chenging has shield effectiveness preferably to electromagnetic field like this.

2. use the permalloy material to have good magnetic property

The utility model has adopted permalloy to do iron core, and permalloy has high initial magnetoconductivity, low-coercivity and low-loss, be about magnet steel 1/5～1/10, the magnetic property stable properties.

High vacuum annealing formula ultra-pure hydrogen annealing process is adopted in iron core thermal treatment, the iron core of working it out has high magnetoconductivity, low magnetism leakage, energy high-fidelity transmission signals, volume is little, in light weight, opposing connection uniaxial stress drag is strong, magnetic stability, the work magnetic strength is higher than magnet steel, be a times of magnet steel during 400HZ, thereby measuring accuracy improves greatly.

3. the utility model adopts the elastic silica gel material to add to be charged between each screen layer to fix iron core, compare traditional mechanical fixation method, and jaw can better coincide, thereby has improved transmission performance, and measuring accuracy improves greatly.

4. the oval internal diameter of unique heavy caliber, overcome the shortcoming that round jaw inconvenience is measured on the flat lead than broad, can be suitable for the measurement of circular and flat lead simultaneously, and air gap is also little, other products of the internal diameter of same size can only measure the above electric current of ampere level, and this product can measure the electric current of 1mA.

5. the current/voltage signal of jaw secondary does not have phase differential, can guarantee the characteristic of waveform. convenient follow-up processing of circuit.

Description of drawings

Fig. 1 is a kind of clip style sensor structural representation of multilayer screen.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment:

As shown in Figure 1, be a kind of clip style sensor structural representation of multilayer screen, the clip style sensor of described a kind of multilayer screen is made up of probe shell 1, iron core 2, three layers of screen layer 3.

Iron core 2 materials can be iron, siliconized plate, permalloy and magnetic, Ferrite Material, in advance with each piece sheet material according to figure paper conversion, probe shell 1, iron core 2 get up for ovaloid seal, heat-treat, install then, iron core 2 is installed on 1 li on probe shell, be equipped with three layers of screen layer 3 between iron core 2 and the probe shell outer wall 4, each screen layer 3 corresponding ground connection 6 is filled out filling gel 5 between every two-layer screen layer 3, guarantee the insulation between each screen layer.

Claims

1. the clip style sensor of a multilayer screen, comprise probe shell (1), iron core (2), iron core (2) places probe shell (1) lining, it is characterized in that, at least be equipped with two-layer screen layer (3) between iron core (2) and the probe shell outer wall (4), each screen layer (3) is equipped with filling gel (5) to similar and different ground connection (6) should be arranged between each screen layer (3).

2. clip style sensor according to claim 2 is characterized in that, described probe shell (1), iron core (2), is oval.

3. clip style sensor according to claim 2 is characterized in that, described iron core (2) can be iron, siliconized plate, permalloy and magnetic, Ferrite Material.