Utility model content
The purpose of this utility model is in order to overcome the low defect of ability of short, unstable working condition of life-span of cathode construction in prior art and vibration and shock resistant, provides that a kind of life-span is long, working stability is reliable, the broadband millimeter wave traveling wave tube cathode construction of vibration and shock resistant.
To achieve these goals, the utility model provides a kind of cathode construction of broadband millimeter wave traveling wave tube, wherein, this structure comprise the first lead-out wire, the second lead-out wire, cathode base, heater assembly, the first cup shell, radome, the second cup shell, the 3rd cup shell, have first circular hole and the first small sircle hole the first lid, there is corresponding with described first circular hole and described the first small sircle hole respectively second largest circular hole and the second lid and the earthenware of the second small sircle hole; Described cathode base is configured to electron emission under thermal radiation effect, the inner affixed described heater assembly of described cathode base, and described heater assembly is configured to provide thermal radiation to described cathode base; Described the first cup shell, described the second cup shell and described the 3rd cup shell have wide section and diameter than wide section little narrow section; Described the first lid and described the second lid are fixed in respectively the medial surface of wide section of described the first cup shell and described the 3rd cup shell; Described cathode base is fixed in narrow section of medial surface of the first described cup shell; Described radome is fixed in described the second cup shell medial surface, and wide section of affixed described the first cup shell of radome medial surface; Wide section of described the second cup shell is fixed in narrow section of medial surface of described the 3rd cup shell; Described earthenware runs through the first circular hole of described the first lid and the second largest circular hole of described the second lid; And the beginning Duan Jun of described the first lead-out wire and the second lead-out wire is fixed in described heater assembly, and the first lead-out wire runs through the first small sircle hole of described the first lid, and the second lead-out wire is positioned at described earthenware.
Preferably, described structure also comprises: the 3rd tantalum paillon foil of the first tantalum paillon foil, the second tantalum paillon foil and " U " type of " L " type; Two described the first tantalum paillon foils are from affixed described the first lead-out wire latter end of sandwich, and the other end of these two described the first tantalum paillon foils is fixed on described the first lid; Described the second tantalum paillon foil is fixed in described the second lead-out wire latter end; And described the 3rd tantalum paillon foil is enclosed within on described the second tantalum paillon foil, and be fixed in described earthenware.
Preferably, described structure also comprises clip, and described clip is configured to described earthenware to be fixed on described the second lid.
Preferably, described structure also comprises porcelain at the bottom of plane, between described heater assembly and described cathode base.
Preferably, described the first cup shell, described the second cup shell and described the 3rd cup shell are the step-like structures that at least two different cylinders of diameter are formed by connecting.
Preferably, on described the second cup shell and/or described the 3rd cup shell sidewall, there is the strip through-hole of 8 45 ° of settings of being separated by a circumferential direction.
Preferably, the junction of described the first cup shell, described the second cup shell, described the 3rd cup shell, described the first lid and described the second lid is zigzag, and described heater assembly has the helix of " S " type.
Preferably, described cathode base is the parts that in molybdenum cylinder, compacting pure tungsten powder forms, the two ends of described molybdenum cylinder have and are positioned at the step-like convex edge of described the first cup shell inside and the outer convex edge away from described heater assembly direction, and the diameter of described interior convex edge is greater than described outer convex edge diameter.
Preferably, described affixed and/or described in be connected to welding.
Preferably, described heater assembly comprises heater and embedding body, and wherein, in described heater assembly, the material of heater is tungsten rhenium alloy wire, and described embedding body is the composite material of aluminium oxide and yittrium oxide; The material of described the first lid and described the second lid is niobium paper tinsel; The material of described the first cup shell, described the second cup shell, described the 3rd cup shell, described radome and described clip is tantalum paper tinsel; And the material of described earthenware is the pottery of content 99% aluminium oxide.
The utility model passes through appropriate design, overcome in prior art that broadband millimeter wave traveling wave tube cathode construction volume is large, thermal capacitance large and the not high defect of positioning precision, avoid being caused by mechanical oscillation, thermal shock the generation of not high phenomenon of cathode construction life-span, job stability and the reliability of broadband millimeter wave traveling wave tube cathode construction are guaranteed, make it in the very high frock of precision, complete assembling, improve the qualification rate of broadband millimeter wave traveling wave tube negative electrode, embodied good repeatability and the stability of this cathode construction manufacturing process.
Other feature and advantage of the present utility model are described in detail the embodiment part subsequently.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
To achieve these goals, the utility model provides a kind of cathode construction of broadband millimeter wave traveling wave tube, as shown in Figure 1, this structure comprises the first lead-out wire 14, the second lead-out wire 15, cathode base 1, heater assembly 2, the first cup shell 3, radome 4, the second cup shell 5, the 3rd cup shell 6, there is the first lid 7 of first circular hole and the first small sircle hole, there is corresponding with described first circular hole and described the first small sircle hole respectively second largest circular hole and the second lid 8 of the second small sircle hole, earthenware 9, clip 10, the first tantalum paillon foil 11 of " L " type, the second tantalum paillon foil 12, porcelain 16 at the bottom of the 3rd tantalum paillon foil 13 of " U " type and plane, described cathode base 1 is configured to electron emission under thermal radiation effect, the inner affixed described heater assembly 2 of described cathode base 1, and described heater assembly 2 is configured to provide thermal radiation to described cathode base 1, described the first cup shell 3, described the second cup shell 5 and described the 3rd cup shell 6 have wide section and diameter than wide section little narrow section, described the first lid 7 and described the second lid 8 are fixed in respectively the medial surface of wide section of described the first cup shell 3 and described the 3rd cup shell 6, described cathode base 1 is fixed in narrow section of medial surface of the first described cup shell 3, described radome 4 is fixed in described the second cup shell 5 medial surfaces, and wide section of affixed described the first cup shell 3 of radome 4 medial surface, wide section of described the second cup shell 5 is fixed in narrow section of medial surface of described the 3rd cup shell 6, described earthenware 9 runs through the first circular hole of described the first lid 7 and the second largest circular hole of described the second lid 8, and the beginning Duan Jun of described the first lead-out wire 14 and the second lead-out wire 15 is fixed in described heater assembly 2, and the first lead-out wire 14 runs through the first small sircle hole of described the first lid 7, and the second lead-out wire 15 is positioned at described earthenware 9, the 3rd tantalum paillon foil 13 of the first tantalum paillon foil 11, the second tantalum paillon foil 12 and " U " type of " L " type, two described the first tantalum paillon foils 11 are from affixed described the first lead-out wire 14 latter ends of sandwich, and the other end of these two described the first tantalum paillon foils 11 is fixed on described the first lid 7, described the second tantalum paillon foil 12 is fixed in described the second lead-out wire 15 latter ends, and described the 3rd tantalum paillon foil 13 is enclosed within on described the second tantalum paillon foil 12, and be fixed in described earthenware 9, described clip 10 is configured to described earthenware 9 to be fixed on described the second lid 8, described structure also comprises porcelain 16 at the bottom of plane, between described heater assembly 2 and described cathode base 1.
Wherein, described heater assembly 2 provides heat by heater strip for whole cathode construction, the end face minimum range that is positioned at narrow section of end face outside housing 4 and radome 4 and the second cup shell 5 on described cathode base 1 is 0.2 millimeter, the end face minimum range that the end face of the first narrow section of cup shell 3 and cathode base 1 are positioned at outside housing 4 is 1 millimeter, described cathode base 1 surface of emission is plane, and launch hole diameter is 2 millimeters.The surface of emission is 0.2 millimeter to the cathode base 1 minimum distance of topping bar.Described the first lead-out wire 14 and described the second lead-out wire 15 are the lead-out wire of negative electrode heater strip in described heater assembly 2; Above-mentioned three cup shells and two lids play the effect that is connected and fixed parts in cathode construction, also use shock proof function simultaneously; Described housing 4 and described earthenware 9 play the effect of insulation, prevent the loss of electronics in cathode construction, increase the density of electron beam; Tantalum paillon foil be for reduce heat on lead-out wire scatter and disappear, improve the heat efficiency.
The utility model passes through appropriate design, overcome in prior art that broadband millimeter wave traveling wave tube cathode construction volume is large, thermal capacitance large and the not high defect of positioning precision, avoid being caused by mechanical oscillation, thermal shock the generation of not high phenomenon of cathode construction life-span, job stability and the reliability of broadband millimeter wave traveling wave tube cathode construction are guaranteed, make it in the very high frock of precision, complete assembling, improve the qualification rate of broadband millimeter wave traveling wave tube negative electrode, embodied good repeatability and the stability of this cathode construction manufacturing process.
In above-mentioned execution mode, preferably, described the first cup shell 3, described the second cup shell 5 and described the 3rd cup shell 6 are step-like structures that at least two different cylinders of diameter are formed by connecting, this step-like structure can facilitate the assembling of each parts in cathode construction, and the tubular structure that the shock resistance of this structure is more single is simultaneously stronger.
In above-mentioned execution mode, preferably, have the strip through-hole of 8 45 ° of settings of being separated by a circumferential direction on the sidewall of described the second cup shell 5 and/or described the 3rd cup shell 6, this strip through-hole has extended conductive path, reduce thermal losses, can increase electron beam density.
In above-mentioned execution mode, preferably, the junction of described the first cup shell 3, described the second cup shell 5, described the 3rd cup shell 6, described the first lid 7 and described the second lid 8 is zigzag, there is the helix of " S " type in the outside of described heater assembly 2, the setting of zigzag and helix can make affixed more tight of each parts, can resist larger impact.
In above-mentioned execution mode, preferably, described cathode base 1 is for suppressing the parts that pure tungsten powder forms in molybdenum cylinder, the two ends of described molybdenum cylinder have and are positioned at the step-like convex edge of described the first cup shell 3 inside and the outer convex edge away from described heater assembly 2 directions, and the diameter of described interior convex edge is greater than described outer convex edge diameter, the sub loss that powers on of outer convex edge can be reduced by convex edge structure is set, the density of electron beam can be increased.
In above-mentioned execution mode, described affixed and/or described connection can be welding, and preferably described affixed and/or described connection can be laser welding, and laser welding can make to combine more closely between each parts.
In above-mentioned execution mode, preferably, described heater assembly 2 is for passing through tungsten rhenium alloy wire coiling, the parts that embedding sintered alumina and yittrium oxide form again, described heater assembly 2 can comprise heater and embedding body, wherein, in described heater assembly 2, the material of heater is tungsten rhenium alloy wire, and described embedding body is the composite material of aluminium oxide and yittrium oxide; The material of described the first lid 7 and described the second lid 8 is niobium paper tinsel; The material of described the first cup shell 3, described the second cup shell 5, described the 3rd cup shell 6, described radome and described clip 10 is tantalum paper tinsel; And the material of described earthenware 9 is the pottery of content 99% aluminium oxide.Each parts adopt corresponding material, can increase the electron density that cathode mechanism provides.
The concrete number of assembling steps of this cathode construction is as follows:
(1) cathode base 1 is placed in weld jig, then heater assembly 2 is installed to 1 li of cathode base, then by laser welding, cathode base 1 and heater assembly 2 are welded, divide equally 6～8 some positions of welding along girth;
(2) first step (1) is completed to the assembly that Laser Welding connects and be placed in negative electrode assembling jig, then the first cup shell 3 is set on assembly and fastening, along even circumferential laser welding, on the notch of each fluting, weld 2～3 points;
(3) the second cup shell 5 and the 3rd cup shell 6 are placed into respectively in assembling jig and fastening, weld along even circumferential in the junction of two cup shells with tungsten weldering cone, on the small pieces of each fluting, weld 2～3 points;
(4) big hole of the second lid 8 is set on the pin on shaping jig, then clip 10 is installed on pin, and be welded on the second lid 8, have 2～3 solder joints on each;
(5) on the first lid 7, weld two the first tantalum paillon foils 11 with tungsten weldering cone;
(6) assembly step (2) having been welded is installed in fixture, then the assembly that step 5 is welded and radome 4 be placed into respectively component internal that step 2 welds and outside and fastening, then with tungsten weldering cone along the even spot welding of girth;
(7) assembly step 6 being welded packs in assembling jig, then the assembly that step 3 is welded is enclosed within assembly outside that step 6 welds fastening, welds with tungsten weldering cone two assembly junctions along even circumferential, welds 2～3 points on the small pieces of each fluting;
(8) assembly step (4) having been welded is installed in the assembly that step 7 welded, and earthenware 9 is set on the lead-in wire of heater assembly 2 until lead-in wire root, and bore and weld along even circumferential with tungsten weldering, on the small pieces of each fluting, weld 2～3 points, finally with tweezers, clip 10 fixed to earthenware 9 and bore and weld clip 10 with tungsten weldering;
(9) the 3rd tantalum paillon foil 13 of " U " type be enclosed within on the second tantalum paillon foil 12 and be fixed welding, earthenware 9 can not be moved left and right on the second tantalum paillon foil 12.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection range of the present utility model.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various execution mode of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.