CN201590387U

CN201590387U - Gun core of electronic gun

Info

Publication number: CN201590387U
Application number: CN2009202779503U
Authority: CN
Inventors: 孙照富; 周新明
Original assignee: Beijing General Research Institute for Non Ferrous Metals
Current assignee: GRIMN Engineering Technology Research Institute Co Ltd
Priority date: 2009-12-17
Filing date: 2009-12-17
Publication date: 2010-09-22
Anticipated expiration: 2019-12-17

Abstract

The utility model provides a gun core of an electronic gun, which comprises a gun core main body formed by a negative electrode, a bunching electrode, a positive electrode, a lamp filament and an electrode core. An insulating and radiating body is sheathed at the periphery of the upper part of the electrode core, a pair of transverse wire connection posts is connected at a partial segment sheathed with the insulating and radiating body, and a longitudinal wire connection post is fixedly connected at the top end of the electrode core; the lamp filament is connected with a lamp filament electrode cylinder sheathed on the electrode core by a lamp filament fixing block; the lamp filament, the lamp filament fixing block, the lamp filament electrode cylinder and the electrode core are formed in an integrated manner; and an insulating cylinder and a component below are jointed with disk springs. A safety cover is additionally arranged outside the gun core, and at least one fan is arranged on the safety cover. The electrode core can freely slide relatively to the component at the periphery. The gun core can improve the performance and reduce the volume of the present electronic gun.

Description

A kind of rifle core of electron gun

Technical field

The utility model relates to a kind of smelting equipment unit, refers to a kind of structural improvement of electron gun rifle core especially.

Background technology

The electron gun of electron beam furnace is the device of the generation electron beam used of smelting process, be mainly used to draw the needed electron beam of smelting process with certain orientation and spot diameter size, its electron beam of drawing can be to refractory metal, (these materials have unique high-melting-point and some other distinctive performance for alloy and compound thereof and composite material, therefore, in national economy, occupy critical role, especially at defence and military, Aero-Space, electronic information, the energy, chemical defence, there is irreplaceable effect in fields such as metallurgy and nuclear industry, be subjected to the great attention of countries in the world, become material supply section educational circles active research the most) carry out melting, to arrive multiple purposes such as purification or crystal-pulling.Therefore electron gun is the key core parts of electron beam furnace, and the rifle core is the parts that electron gun produces electron beam.

The rifle core is the generation systems that electron gun produces electron beam, and the high-voltage electrostatic field of electron gun rifle core generally is designed to be made up of a filament and three electrodes, and three electrodes are respectively negative electrode, bunching electrode, anode.Negative electrode and bunching electrode equipotential, plus earth.Only reasonably design and select between these three electrodes shape and between the situation in distance, gap under, the equipotential that just can make each electrode produce suitable shape in its space after connecting corresponding work voltage distributes, and forms a desirable high-voltage electrostatic field.Therefore, the structure of electron beam generation systems directly influences the track of performance, emissivities and the electron beam of an electron gun, and then has influence on the performance of whole electron gun.Therefore, can think in some sense: the rifle core is the core component of electron beam furnace core.

The operation principle of rifle core: the filament to the rifle core adds that low-voltage, high-current can itself generate heat it, between cathode block and filament, add simultaneously 2500 ~ 3000 volts direct voltage, (high temperature and voltage) in this case, filament sends electronics, these electron bombards of sending from filament are to cathode block, (the filament electron bombard of sending here promptly is the bombarding current that everybody says usually to the electric current on the negative electrode), thereby the cathode block temperature is elevated to more than 2000 ℃, equally, cathode block overflows electronics and flies to anode under several ten thousand volts high pressure between negative electrode and the anode, the electric current that these electronics form is the beam electronic current of usually said electron beam furnace.Thereafter electron beam enters the electronics light path system through anode hole, bombards at last and carries out melting on the material of wanting melting.

The rifle core of electron gun is worked under vacuum state, therefore the quality of sealing is directly determining the electron gun use of can working, but the temperature of the filament 32 of electron gun rifle core is more than degree more than 2000, and cathode block 36 is under the heating of bombarding current, its surperficial working temperature is also more than 2000 degree, therefore a large amount of heats of electron gun rifle core generation will constitute very big threat to the sealing of rifle core, therefore will just seem very necessary to the cooling of rifle core.

If the rifle core adopts water-cooling pattern, then in the rifle core a lot of water routes to be arranged, in electrode because electrode can produce heat when aliving, so cooling water can only be by high-field electrode as cooling water channel (more complicated that structure becomes, volume is also bigger).And the voltage of water tank is no-voltage, therefore, between rifle core and water tank, exist pressure reduction, so will between rifle core and water tank, add very long insulation cooling water pipe, reduce electric current in the cooling water to increase resistance, thereby reduce the power loss taken away by cooling water.If do not adopt long cooling water pipe, then can cause electron gun rifle core filament power do not increase, thereby cause the actual use power of electron gun not increase, the use power that perhaps is exactly electron gun can reach, but lost a large amount of power at cooling water during by pipeline, thereby also brought drawback that the aspect costs such as configuration of power supply improve or the like.More at rifle in-core solder joint, destroy vacuum thereby easily leak under the high temperature, and cathode block causes because of leaking uselessly, cause electron gun not work.

When electron gun is worked in addition, all can be under the high temperature with the related components that filament is connected with cathode block, if relating to the benchmark anchor point of the distance between filament and the cathode block selects incorrect, then the thermal expansion meeting of related components causes the variable in distance between filament and the cathode block bigger, thereby the influence that the shape of the electron beam of being drawn and line size and cathode block and burn-out life etc. cause be can not be ignored.

Summary of the invention

The purpose of this utility model provides a kind of structure-improved of electron gun rifle core, and the performance that it can improve existing electron gun makes it to reduce volume, reduces welding and overcome the defective of easy leakage.

For achieving the above object, the utility model is taked following design:

A kind of rifle core of electron gun, comprise the rifle core body that constitutes by negative electrode, bunching electrode, anode, filament and pole piece, wherein negative electrode, bunching electrode, anode and filament are positioned at emitting head, be with insulation and radiator in the periphery, top of pole piece, pick out a pair of horizontal binding post at the local segment that is with insulation and radiator, the top of pole piece fixedly is connected to vertical binding post; Described filament is connected by the filament electrode tube that filament fixed block and is enclosed within on the pole piece, and filament, filament fixed block, filament electrode tube and pole piece one body component are made; Described radiator is a pair of upper and lower radiating block that is provided with respectively, the insulator that periphery, described pole piece top is with is one group of insulation magnetic support and insulating cylinder of being separated from each other setting, insulation magnetic support next-door neighbour emitting head, last radiating block, last horizontal binding post are positioned at the top of insulating cylinder, following radiating block, following horizontal binding post are positioned at the below of insulating cylinder, and insulating cylinder and lower part junction surface are equipped with the dish spring.

Add a safety guard in the outside of rifle core, a blower fan is installed on safety guard; One plectane that can play thermolysis is set on the top of rifle core; Upper and lower radiating block outer surface is processed into the finned surface shape.

Described pole piece its peripheral components relatively is free to slide.

The utility model has the advantages that:

1. offer air-cooled pipeline, its compact conformation, good cooling results, and overcome the drawback of water-cooling pattern.

2. the adjustment by anchor point is selected can reduce the adverse effect that thermal expansion causes, thereby prolongs the cathode block and the burn-out life of rifle core.

3. selecting for use of dish spring group can avoid that some parts Yin Wendu of electron gun rifle core are too high to deform or the destruction of the vacuum degree of damage and electron gun system.

4. can reduce welding, thereby overcome the defective of easy leakage.

Description of drawings

Fig. 1 is the rifle cored structure schematic diagram of the utility model electron gun

Embodiment

Fig. 1 shows rifle core one example structure of the utility model electron gun, wherein, the rifle core of the utility model electron gun is the rifle core body that is made of associated components such as negative electrode, bunching electrode, anode, filament and pole pieces, wherein negative electrode 36, bunching electrode 37, anode 38 and filament 32 are positioned at emitting head, and cover 34 was formed under the functional part in this emitting head was reached by big radome 21, little radome 30.Part is a pole piece 12 in rifle in-core bosom, and the periphery of pole piece tightly is with filament electrode tube (also being inner core) 10, and outermost is a urceolus 17, and the following head end of filament electrode tube 10 is positioned at rifle core emitting head, and is connected with the filament fixed block 28 of bearing location filament 32.Be with insulation and radiator in the periphery, top of pole piece, and pick out a pair of horizontal binding post 8, one vertical binding posts 3 are fixed on pole piece 12 by wiring column base 5 and insulating base 6 top in the part of two radiators up and down (being with insulation reaches).

Important improvement point of the present utility model is the selection to anchor point: during electron gun work, the related components that is connected with cathode block 36 with filament 32 all can be under the high temperature, if relating to the benchmark anchor point of the distance between filament and the cathode block selects incorrect, then the thermal expansion meeting of related components causes the variable in distance between filament 32 and the cathode block 36 bigger, thereby the influence that the shape of the electron beam of being drawn and line size and cathode block and burn-out life etc. cause be can not be ignored.The adverse effect that is caused for reducing thermal expansion as much as possible, several parts (filament electrode tube 10 that the utility model electron gun will closely link to each other with filament, pole piece 12, filament fixed block 28 and filament 32 etc.) be made as a global facility, lower surface with insulation magnet ring 19 is the benchmark location, other parts can freely elongate or shorten, has only this segment distance between magnet ring 19 and the filament 32 to what the distance between filament 32 and the cathode block 36 impacted like this, thereby having improved greatly in the prior art with heat sink 9 is the installing and locating point, distance between filament 32 and the cathode block 36 makes its influence almost be reduced to minimum because of being subjected to elevated temperature heat to influence big drawback.In the present embodiment structure, be with insulation and radiator in the periphery, top of pole piece 12, wherein radiator is a pair of upper and lower

radiating block

9,15 that is provided with respectively, the insulator that periphery, described pole piece top is with is one group of insulation magnetic support 16 and insulating cylinder 11 of being separated from each other setting, insulation magnetic support 16 next-door neighbour's emitting heads, last radiating block 9, last horizontal binding post 8 are positioned at the top of insulating cylinder 11, and following radiating block 15, following horizontal binding post are positioned at the below of insulating cylinder 11.When considering the work of rifle core, filament electrode tube 10 should make progress and freely extend, part 11 also should and then move up, can occur poorly sealed in sealing place at radiating block 9 and insulating cylinder 11 places and phenomenon generation gas leakage, elongation this moment in addition if the part of freely extending can not make progress automatically, then the hope that changes in admissible scope for the distance that guarantees between filament 32 and the cathode block 36 can not realize equally, therefore, add at insulating cylinder 11 and lower part junction surface that one group of butterfly spring 14 (utilizing it to have the characteristics of big load bearing capacity in little space) can upwards freely stretch in the time of just can reaching the rifle core in heat expansion automatically and air tight.Radial seal (as shown in FIG., adding O RunddichtringO 1) is adopted in the sealing between insulating cylinder 11 and the radiating block 15 simultaneously, when insulating cylinder 11 freedom are upwards slided and air tight.On the whole, it is simple in structure, is easy to realize.

Another important improvement point of the present utility model is: electron gun rifle core adopts air-cooled mode to cool off: add a safety guard 40 (for preventing that the people from touching several ten thousand volts high pressure) in the outside of rifle core, and blower fan 39 just is installed on this safety guard, can be to the blowing of electron gun rifle core, the rifle core distributes the heat that the rifle core produces with following radiating block 15 timely by plectane 2 and the last radiating block 9 that the top at the rifle core is provided with.Other is processed into the finned surface shape to the last radiating block 9 of rifle core and the outer surface of following radiating block 15, increase area of dissipation, its compact conformation, simple, and good heat dissipation effect has overcome that the volume that water-cooling pattern caused that the rifle core cooling of domestic some unit adopts is big, the many and shortcomings such as easy leakage that cause of complex structure and pad.

The rifle core is when work, the thermal expansion of pole piece 12 and filament electrode tube 10 varies in size, can produce undesirable thing equally and take place, this structure adopts and is free to slide between pole piece 12 and its part that is contacted on every side and can not causes the interference deformation of mechanism or the drawback of gas leakage etc.

Because the utility model makes electron gun performance better to the improvement of electron gun rifle cored structure, has effectively prolonged the useful life of electron gun.

The various embodiments described above can not break away under the scope of the present utility model in addition some variations, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit claim of the present utility model.

Claims

1. the rifle core of an electron gun, comprise the rifle core body that constitutes by negative electrode, bunching electrode, anode, filament and pole piece, wherein negative electrode, bunching electrode, anode and filament are positioned at emitting head, be with insulation and radiator in the periphery, top of pole piece, pick out a pair of horizontal binding post at the local segment that is with insulation and radiator, the top of pole piece fixedly is connected to vertical binding post; Described filament is connected by the filament electrode tube that filament fixed block and is enclosed within on the pole piece, it is characterized in that: filament, filament fixed block, filament electrode tube and pole piece one body component are made; Described radiator is a pair of upper and lower radiating block that is provided with respectively, the insulator that periphery, described pole piece top is with is one group of insulation magnetic support and insulating cylinder of being separated from each other setting, insulation magnetic support next-door neighbour emitting head, last radiating block, last horizontal binding post are positioned at the top of insulating cylinder, following radiating block, following horizontal binding post are positioned at the below of insulating cylinder, and insulating cylinder and lower part junction surface are equipped with the dish spring; Add a safety guard in the outside of rifle core, at least one blower fan is installed on safety guard.

2. the rifle core of electron gun according to claim 1 is characterized in that: a plectane that can play thermolysis is set on the top of rifle core.

3. the rifle core of electron gun according to claim 1, it is characterized in that: described upper and lower radiating block outer surface is processed into the finned surface shape.

4. the rifle core of electron gun according to claim 1 is characterized in that: the sealing employing radial seal between insulating cylinder and the following radiating block.

5. the rifle core of electron gun according to claim 1 is characterized in that: described pole piece its peripheral components relatively is free to slide.