CN2373800Y - Magnetic steel for seismic detector - Google Patents

Abstract

The utility model discloses a magnetic steel of an earthquake detector, the magnetic steel of which is composed by the combining of the two permanent magnets with homopolar opposite. The utility model solves the problem of magnetic uniformity to enable the variation range within plus or minus 2.5 percent; the gap magnetic field strength formed by the utility model can be improved, and furthermore, the utility model has the advantage of simple manufacture technology, and thereby, the cost is low.

Description

A kind of magnet steel of seismoreceiver

The utility model is specifically related to a kind of magnet steel of seismoreceiver.

The magnetic structure that magnet steel forms in the seismoreceiver is broadly divided into two classes at present.One: this magnet steel is a cylinder permanent magnet, and an end is the N utmost point, and the other end is the S utmost point, and its magnetic circuit is approximate closing structure.Approximate closed magnetic circuit is to design on the basis that is magnetic source with the Al-Ni-Co permanent magnet material.And the interior magnetic resistance of this permanent magnetic material coercive force very low (about 1500GS) is little, and the gap magnetic field of output can be very low and unstable if length-to-diameter is less; And long and footpath is bigger, and then the remanent magnetism utilization factor is too low.Both used the rare earth magnetic steel of coercive force greater than 12000GS, its gap magnetic field does not have too big raising yet.

Its two, the magnet steel structure is an annulus column permanent magnet, adopts rare earth permanent magnet such as SmCo, neodymium iron boron and other new material composition to make.Its magnetic line of force is by magnet ring outside surface one utmost point such as the N utmost point, and another utmost point of inside surface is got back in radiation and going out through conduction, and this magnetic circuit is a closing structure.This kind magnet steel structure has been given full play to the magnetic property of permanent magnet, is comparatively ideal from the magnetic Circuit Design angle.But this magnetic line of force is along the magnet steel radial radiation, and from the manufacturing angle of set magnet permanent material, the footpath width of cloth is penetrated ring manufacturing process complexity, and yield rate is low, so the cost height, waste is big, and no advantage costs an arm and a leg in concrete practicality.

The magnet steel of above-mentioned in addition two kinds of structures all can only lean on permanent magnetic material itself to solve the magnetic property consistency problem.And permanent magnetic material standard performance fluctuation range domestic at present and that carry out in the world is all about ± 5%.By the desired sensitivity of present manufacturing very-high performance seismoreceiver and degree of distortion then its magnetic property fluctuation range of requirement be ± 2.5%, more than the magnet steel of two kinds of structures be difficult to meet this requirement, even its production comes out also to have a greater part of defective, situation is very undesirable.

The purpose of this utility model just provides a kind of magnet steel of seismoreceiver, solve improving the problem of gap magnetic field density and magnetic flux, and solves the conforming problem of magnetic property, the magnetic property fluctuation is controlled at ± 2.5% in; Also solve simplified manufacturing technique in addition, make and make simply the problem that cost reduces.

The purpose of this utility model is achieved through the following technical solutions: a kind of magnet steel of seismoreceiver, this magnet steel are to be assembled relatively with two permanent magnet homopolarities.

Can assemble a magnetic conductor that matches with the permanent magnet shape between the above-mentioned permanent magnet, magnet steel can be by bonding or wear with non-magnetic bearing pin string and close or outer tube edge mode such as close is adorned and closed.

This magnetic line of force can be penetrated to magnetic conductive shell by a utmost point such as N pole-amplitude that middle magnetic conductor forms, transfer to the magnetic conduction end cap along housing to two ends, and be back to the S utmost point at two ends by the magnetic boots (gathering magnet) that are connected mutually, between middle magnetic conductor and housing, form gap magnetic field.

The utility model since permanent magnet that it adopted part by two permanent magnets be combined into that repels each other, magnetic line of force is that addition forms in the middle of it like this.When assembling permanent magnet magnet steel, outside ± 2.5% magnetic fluctuation range, can high and low suitable collocation adjust its comprehensive magnetic in ± 2.5%, so just solved consistency problem easily.Through having tested 100 geophone sensitivities is ± 5%, is higher than originally 10%, and degree of distortion ± 2.5% is higher than original ± 5%.When it used and is similar to the rare earth magnetic steel of closed magnetic circuit magnet steel identical weight, its field intensity was multiplied in addition.The utility model assembling is simple in addition, and its selection of material is the ordinary production product, need not special process, thereby cost is lower.

Be that embodiment elaborates to the utility model below with the accompanying drawing.

Fig. 1 is wave detector and magnet steel structure assembling synoptic diagram thereof.

Fig. 2 is a permanent magnet magnetic circuit synoptic diagram.

As shown in Figure 1, magnet steel is made up of two homopolarity permanent magnet opposed 4 and middle magnetic conductor 5 among this embodiment, there are magnetic boots 3 at the magnet steel two ends, magnetic boots 3 are gathering magnet, magnet steel is set with magnetic conductive shell 1 magnetic conductive shell 1 two ends outward and is equipped with magnetic conduction end cap 2, and magnetic conduction end cap 2 holds out against magnetic boots 3, is set with coil former 6 between shell 1 and magnet steel, be wound with coil 7 on it, stretch out spring leaf 8 on the coil former 6 and contact with magnetic boots 3.The utmost point that formed by middle magnetic conductor of its magnetic line of force such as N polar radiations and go out through magnetic conductive shell 1 to transfer to magnetic conduction end cap 2 and be back to the S utmost point at magnet steel two ends by the magnetic boots 3 that are connected mutually as shown in Figure 2 are at 1 formation of middle magnetic conductor 5 and housing gap magnetic field.

Magnet steel of the present utility model can also form or outer tube edge closes and forms by wearing to close with the bearing pin string.

Claims (3)

1, a kind of magnet steel of seismoreceiver is characterized in that its magnet steel is to be closed by two homopolarity permanent magnet opposed dresses to form.

2, magnet steel according to claim 1 is characterized in that between described two permanent magnets the magnetic conductor that assembling one and magnet shape match.

3, magnet steel according to claim 1 and 2 is characterized in that magnet steel can or wear one of form so that magnetic conduction bearing pin string not closes or the outer tube edge closes and adorn and close by bonding clamping.