Background technology
Liquid reservoir is the particularly significant components in the air conditioning for automobiles of air-conditioning, and it is a kind of closed container, and cold-producing medium flows into from its inlet, flows out from liquid outlet after filtration with after the drying.The effect of liquid reservoir is: store unnecessary cold-producing medium in the air-conditioning refrigeration system, guarantee to be liquid medium before cold-producing medium enters expansion valve, and cold-producing medium is played desiccation, make that the moisture of cold-producing medium remains in the certain index in the system; To the cold-producing medium filtration, the impurity in the system can not flow in expansion valve or the compressor, thereby system is played a protective role.
Such as Chinese utility model patent specification (ZL200620096540.5) record, the liquid reservoir that uses in the present air conditioning for automobiles, consider conserve space and the needs of simplifying system component, the integrative-structures that adopt heat exchangers and liquid reservoir to connect firmly: liquid reservoir is connected firmly a side at heat exchanger isolation barrier place collector tube more, and a passage is set respectively in the both sides of collector tube isolation barrier, as the inlet and the liquid outlet of liquid reservoir.
See also Fig. 1, this figure is the structural representation of the liquid reservoir of prior art, please be simultaneously referring to Fig. 2, and this figure is the enlarged drawing at G position among Fig. 1.As shown in Figure 1 and Figure 2, liquid reservoir of the prior art comprises: cylindrical shell 2, have cylindrical shell inlet 21 and cylindrical shell liquid outlet 22, and the import and export with heat exchanger collector tube (figure does not show) are communicated with respectively; The desiccant bag 4 of drier 3 is housed, places cylindrical shell 2 inside; Adapter 7, wherein, adapter first periphery 73 forms adapter stage portion 71 with adapter second periphery 74, and this adapter stage portion 71 is integrally welded with cylindrical shell upper end 23 usefulness argon arcs, and forms weld part 10; Offer adapter fluid hole 72 on the described adapter 7, align with cylindrical shell liquid outlet 22, cylindrical shell 2 inner refrigerants are flowed out by cylindrical shell liquid outlet 22 behind adapter inner chamber 75, adapter fluid hole 72; Screen pack 5 covers on the adapter fluid hole 72, is used for cold-producing medium is filtered; Bottom 1 is welded on the cylindrical shell step surface 25 of cylindrical shell bottom 26, and cylindrical shell 2 is sealed; The loam cake 8 that has sealing ring 6 screws in the adapter loam cake sealing 76, and cylindrical shell 2 is sealed; Thus, form the closed container that has only cylindrical shell inlet 21 and cylindrical shell liquid outlet 22.In the assembling process of this liquid reservoir, comprise two welding sequences, the welding of cylindrical shell 2 and adapter 7 before this is the welding with heat exchanger then, and, needing 360 degree revolutions because of cylindrical shell 2 during with adapter 7 welding, above-mentioned two welding sequences can not be put upside down.Its main installation process is: 1. cylindrical shell 2 install with adapter 7 → 2. argon arc welding → 3. weld part 10 leak detections → 4. and heat exchanger to be welded assemble → 5. adorn in the continuous tunnel furnace of bottom 1 → 6. and Welding of Heat-exchanger → 7. hunt leak.
Above-mentioned liquid reservoir, compact conformation, it is little to take up room, and has avoided the problem that use connection long tube may occur leaking in traditional liquid reservoir.But because the restriction of structure and assembly process, also there is obvious defects in this liquid reservoir: one is the sealing problem that exists after welding; Its two, be the not good enough problem of filter effect.Concrete reason is: adapter 7 adopts argon arc welding with cylindrical shell 2, its fusing point is about 600 ℃, be installed on the heat exchanger after the welding of heat reservoir assembly, in continuous tunnel furnace with Welding of Heat-exchanger, because the temperature of continuous tunnel furnace is 630~650 ℃, stove weldering process can produce the secondary heat affecting to previous argon arc weld part 10, and the seam organization of weld part 10 is changed, cause the intensity and the air-tightness of weld seam to change, influence welding quality and reduce the sealing property of cylindrical shell 2; Bottom 1 cooperates area less with 25 of the cylindrical shell step surfaces of cylindrical shell bottom 26, is prone to welding situation not in place, further influences the sealing of cylindrical shell 2; For ease of assembling, adapter 7 second peripheries and cylindrical shell 2 internal faces are matched in clearance, cause 22 of cylindrical shell inlet 21 and cylindrical shell liquid outlets the slit to occur, and the part cold-producing medium is a passage with this slit directly, thereby influence causes filter effect not good enough to the filtration of cold-producing medium.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is, a kind of liquid reservoir is provided, can guarantee the welding quality between cylindrical shell and adapter, improve the sealing property of cylindrical shell, also can avoid the slit occurring between cylindrical shell inlet opening and the cylindrical shell fluid hole, improve filter effect cold-producing medium; For this reason, the present invention also provides a kind of manufacture method of liquid reservoir.
For solving the problems of the technologies described above, the invention provides liquid reservoir, comprise, a cylindrical shell, its upper end is provided with cylindrical shell inlet and cylindrical shell liquid outlet; One adapter, its switching part are pressed in the described cylindrical shell upper end, and its sealing can screw in loam cake; Described switching part is provided with the adapter fluid hole, and described adapter fluid hole is communicated with described cylindrical shell liquid outlet; Described switching part is provided with at least one groove, places solder flux in the described groove, is used for described cylindrical shell and described adapter are tightly connected.
Preferably, the periphery of described switching part and the internal face of described cylindrical shell are for excessively to cooperate or interference fit.
Preferably, described groove is two, lays respectively at the both sides of described adapter fluid hole.
Preferably, described groove is more than two, is uniformly distributed in the both sides of described adapter fluid hole.
Preferably, described groove is a ring-type, its cross section or be rectangle, or be trapezoidal, or be arc.
Preferably, the periphery diameter of described switching part forms the adapter stage portion less than the periphery diameter of described sealing between described switching part and the described sealing.
Preferably, place described solder flux between described adapter stage portion and the described cylindrical shell upper end.
Preferably, weld between described adapter stage portion and the described cylindrical shell upper end.
Preferably, the periphery diameter of described switching part and the periphery equal diameters of described sealing are provided with positioning convex or locating slot between described switching part and the described sealing.
Preferably, the fusing point of described solder flux is 550~650 ℃.
Preferably, also comprise bottom, be welded on the bottom of described cylindrical shell, be used for described cylindrical shell sealing.
Preferably, the bottom spinning undergauge of described cylindrical shell is used for described cylindrical shell sealing.
Preferably, the inside and outside surface of described reducing diameter part is parabola or cambered surface.
Preferably, apply solder flux at described undergauge top.
For making above-mentioned heat reservoir, manufacture method provided by the invention may further comprise the steps: described switching part is carried out slot rolling, form at least one groove on described switching part; In described groove, place solder flux; Described adapter is pressed into the upper end of described cylindrical shell, forms the liquid reservoir assembly; With described liquid reservoir assembly and heat exchanger assembling, and in continuous tunnel furnace, carry out the stove weldering.
Preferably, before described adapter is pressed into institute's art cylindrical shell, to the spinning necking down of described cylindrical shell bottom.
Preferably, after the spinning necking down of described cylindrical shell bottom, apply solder flux at the necking down top.
Compared with prior art, liquid reservoir provided by the invention, at least one groove of processing is wherein placed solder flux on switching part, is used for cylindrical shell and adapter are tightly connected; And the fusing point of solder flux and continuous tunnel furnace are interior or other welding surroundings temperature are suitable, are typically 550~650 ℃, guarantee solder flux reliably fusing in continuous tunnel furnace or under other welding surroundings.
Liquid reservoir manufacture method provided by the invention has been simplified the argon arc welding sequence between the adapter and cylindrical shell in the existing liquid reservoir assembling process; What make welding between adapter and cylindrical shell and liquid reservoir and heat exchanger is welded on the continuous tunnel furnace disposal molding.
Specifically: when assembling, in the groove that processes, place solder flux earlier, with adapter and cylindrical shell assembling; With above-mentioned liquid reservoir assembly and heat exchanger assembling to be welded, be positioned in the continuous tunnel furnace, simultaneously heat exchanging device and the disposable welding fabrication of liquid reservoir assembly again; The high temperature of process of passing through tunnel stove, solder melts Hou Seepage are gone into the contact surface between switching part periphery and the cylinder inboard wall face, and form the portion that is tightly connected reliably between switching part periphery and cylinder inboard wall face.Owing to avoided the secondary heat affecting problem behind the adapter and the welding of cylindrical shell argon arc in the prior art, can keep the uniformity of cylindrical shell and adapter seam organization, guarantee weld strength and bubble-tight stable, raising product welding quality, raising cylindrical shell sealing property; And solder flux is positioned at by the adapter fluid hole, fills up slit between cylindrical shell inlet opening and cylindrical shell fluid hole after its fusing, make cold-producing medium through could flowing out from the cylindrical shell liquid outlet behind the filter screen, thereby raising is to the filter effect of cold-producing medium.
In the preferred version of the present invention, the periphery of switching part and the internal face of cylindrical shell are further avoided the slit occurring between cylindrical shell inlet opening and the cylindrical shell fluid hole for excessively to cooperate or interference fit, improve the filter effect to cold-producing medium; Cancellation cylindrical shell lower bottom cover, the direct spinning undergauge that carries out on the section bar of cylindrical shell is close, improves the reliability of cylindrical shell bottom; Also apply solder flux, promptly add soldering, further improve the sealing property of cylindrical shell, improve product percent of pass, and reduce production costs at the undergauge top.
The specific embodiment
For ease of discussing, earlier relational term is explained as follows:
Spinning: a kind of stress metal processing method of the thin-walled hollow revolving body workpieces that is used to be shaped.It does feed motion by instruments such as spinning rollers, stresses on the metal blank with the same axis rotation of core, makes its continuous local plastic deformation of generation and becomes required hollow revolving body workpieces.Spinning comprises conventional spinning and flow turning (claiming shear spinning again) two big classes.
The advantage of rotary pressing processing is equipment and mold all fairly simple (can not replace with lathe when having special-purpose spinning machine), except that the rotary body that can be shaped, also can process the rotary body part of suitable complicated shape as cylindrical shape, taper, parabolic formation or other various curves formations.Shortcoming is that productivity ratio is lower, and labour intensity is bigger, relatively is applicable to trial-production and small lot batch manufacture.
Basic design of the present invention is, change the structure and the welding manner of adapter and cylindrical shell welding position: machined grooves on switching part, placing solder flux in groove is the high temperature melting material, and the welding sequence between welding sequence, liquid reservoir and the heat exchanger between adapter and cylindrical shell is together carried out in continuous tunnel furnace.
Below in conjunction with accompanying drawing the present invention is further described.
See also Fig. 3, this figure is the partial structurtes schematic diagram of liquid reservoir first embodiment of the present invention, please be simultaneously referring to Fig. 1, Fig. 2, and the liquid reservoir of present embodiment comprises: cylindrical shell 2, have cylindrical shell inlet 21 and cylindrical shell liquid outlet 22, the import and export with heat exchanger collector tube (figure does not show) are communicated with respectively; The desiccant bag 4 of drier 3 is housed, places cylindrical shell 2 inside; Adapter 7, its switching part 70 can be pressed in the cylindrical shell upper end 23; Described switching part 70 is provided with adapter fluid hole 72, and it is communicated with cylindrical shell liquid outlet 22; Screen pack 5 covers on the adapter fluid hole 72, is used for cold-producing medium is filtered; The loam cake 8 that has sealing ring 6 screws in the sealing 76 of adapter 7, is used for cylindrical shell 2 is sealed.
Two circumferential grooves 77 of processing are symmetrically distributed in adapter fluid hole 72 both sides on switching part 70.Described groove 77 is a ring-type, and its cross section is rectangle, trapezoidal, semicircle and other shapes, considers factors such as process tool, and preferably, the cross section of groove 77 is a rectangle.The width of described groove 77 and height dimension just in time can freely hold the solder flux 9 that the high temperature melting material is made, and described solder flux 9 is a whole weld-ring, also can be the split weld-ring that multistage arc welding rod constitutes; Temperature in the fusing point of solder flux 9 and the continuous tunnel furnace is suitable, usually about 550~650 ℃.Obviously, when continuous tunnel furnace temperature interior or other welding surroundings exceeds the said temperature scope, should select the solder flux 9 of corresponding fusing point for use, guarantee that it can melt reliably in continuous tunnel furnace or under other welding surroundings.
When assembling, in the groove 77 that processes, place solder flux 9 earlier, adapter 7 is pressed into cylindrical shell 2, form the liquid reservoir assembly, with above-mentioned liquid reservoir assembly and heat exchanger assembling to be welded, be positioned in the continuous tunnel furnace then, to liquid reservoir assembly and the disposable welding fabrication of heat exchanger, promptly stove welds simultaneously.Through high temperature, the solder flux 9 fusing , Seepage on adapter fluid hole 7 both sides go into to the contact surface of the periphery of switching part 70 and 24 in cylinder inboard wall face, thereby are tightly connected portion's (scheming not show) between the periphery of switching part 70 and cylinder inboard wall face 24 reliably.Because the welding sequence between welding sequence, liquid reservoir assembly and heat exchanger that adapter 7 and cylindrical shell are 2 together carries out, avoid the secondary heat affecting after adapter in the former technology 7 and cylindrical shell 2 argon arc weldings, guarantee the uniformity of seam organization between cylindrical shell 2 and the adapter 7, guarantee weld strength and bubble-tight stable, thereby improve the product welding quality, improve the sealing of cylindrical shell 2.It is other that solder flux 9 is positioned at adapter fluid hole 72, fills up the slit of 22 of cylindrical shell inlet opening 21 and cylindrical shell fluid holes after its fusing, thereby help to improve the filter effect to cold-producing medium.
In the present embodiment, preferably, the periphery of switching part 70 and cylinder inboard wall face 24 reduce the initial slit of 22 of cylindrical shell inlet opening 21 and cylindrical shell fluid holes for excessively to cooperate or interference fit.The high temperature of process of passing through tunnel stove can be filled up the slit of cylindrical shell inlet opening 21 and 22 of cylindrical shell fluid holes fully after solder flux 9 fusing, guarantee that cold-producing medium could flow out behind filter screen, and further raising is to the filter effect of cold-producing medium.Be understandable that the periphery of switching part 70 and cylinder inboard wall face 24 also can be matched in clearance, certainly, its raising degree to the filter effect of cold-producing medium is remarkable not as the former.
In addition, in the present embodiment, preferably, adapter 7 comprises two peripheries, wherein: the periphery of switching part 70, claim adapter second periphery 74 again, the periphery of sealing 76 claims adapter first periphery 73 again; The diameter of adapter second periphery 74 makes to form adapter stage portion 71 between switching part 70 and the sealing 76 that the degree of depth that adapter 7 is pressed into cylindrical shell 2 positions less than the diameter of adapter first periphery 73.Be understandable that described adapter 7 also can have plural periphery, its operation principle and last same does not repeat them here.Certainly, adapter 7 also can have only a periphery, in other words, the diameter of adapter second periphery 74 equals the diameter of adapter first periphery 73, and between described switching part 70 and described sealing 76, positioning convex or locating slot are set, thereby the degree of depth that adapter 7 is pressed into cylindrical shell 2 is positioned.
See also Fig. 4, this figure is the partial structurtes schematic diagram of liquid reservoir second embodiment of the present invention, please be simultaneously referring to Fig. 1, Fig. 2.Present embodiment is the simplified structure of first embodiment, and its difference is on the described switching part 70, to have only a groove 77, and this groove 77 is positioned at the side of adapter fluid hole 72 near cylindrical shell inlet 21.
Similarly, place solder flux 9 in the groove 77, adapter 7 is pressed into cylindrical shell 2 with excessive cooperation or interference fit form, form the liquid reservoir assembly, with above-mentioned liquid reservoir assembly and heat exchanger assembling to be welded, be positioned in the continuous tunnel furnace, simultaneously heat exchanging device and the disposable welding fabrication of liquid reservoir assembly then.Make solder melts Seepage in the groove 77 go into to switching part 70 peripheries and and cylinder inboard wall face 24 between contact surface, in switching part 70 peripheries and 24 formation of cylinder inboard wall face portion that is tightly connected reliably, also eliminate the slit between cylindrical shell inlet 21 and the cylindrical shell liquid outlet 22 simultaneously, thereby improve the sealing property of cylindrical shell 2, improve filter effect cold-producing medium.
In the present embodiment, on adapter second periphery 74 groove 77 only is set, be the welding quality that guarantees 7 of cylindrical shell 2 and adapters and the sealing property of cylindrical shell 2, the quantity that should add the width and the solder flux 9 of big groove 77, make solder flux 9 fusing backs form the bigger portion that is tightly connected of area, improve product reliability at switching part 70 peripheries and 24 in cylinder inboard wall face.
See also Fig. 5, this figure is the partial structurtes schematic diagram of liquid reservoir the 3rd embodiment of the present invention, please be simultaneously referring to Fig. 1, Fig. 2.Present embodiment is optimizing structure of first embodiment, on the switching part 70 on adapter fluid hole 72 both sides, and two grooves 77 of symmetry processing; In addition, 23 in adapter stage portion 71 and cylindrical shell upper end, place solder flux 9, perhaps adapter stage portion 71 and cylindrical shell upper end 23 are welded, with the welding quality of 7 of further raising cylindrical shell 2 and adapters.
In this embodiment, kept structure and technology among first embodiment fully, also inherited its advantage, do not repeated them here.Owing to place solder flux 9 for 23 in adapter stage portion 71 and cylindrical shell upper end, when heating in continuous tunnel furnace, this part solder flux 9 melts and in cylindrical shell 2 and 7 formation of adapter portion that is tightly connected reliably; Perhaps adapter stage portion 71 and cylindrical shell upper end 23 are welded, form the weld part of a redundancy; Further improve the welding quality between cylindrical shell 2 and the adapter 7 thus, improve the sealing property of cylindrical shell 2, improve product reliability.Certainly, according to the technical scheme in the present embodiment, can increase production cost to a certain extent, therefore, unless product has special quality requirement, it will not adopt in the ordinary course of things.
Present embodiment is the improvement to first embodiment, and in like manner, it is also applicable to second embodiment, and welding quality and sealing property with further raising product do not repeat them here.
See also Fig. 6, this figure is the partial structurtes schematic diagram of liquid reservoir the 4th embodiment of the present invention, please be simultaneously referring to Fig. 1, Fig. 2, Fig. 3.Present embodiment is the improvement to first embodiment, and its improvement is, except that being symmetrical arranged the groove 77 on adapter fluid hole 72 both sides, also the spinning undergauge is carried out in cylindrical shell bottom 26, the semiclosed inner chamber 28 of the cylindrical shell 2 of formation; Consider the convenience of processing, preferably, the inside and outside surface of reducing diameter part is parabola or cambered surface.It further improves, and applies solder flux at undergauge top 27, promptly carries out soldering, makes solder flux cover undergauge top 27.
Its assembling process is: on the switching part 70 on adapter fluid hole 72 both sides, each processes a groove 77, makes the width of groove 77 and height dimension just in time can freely hold solder flux 9; In groove 77, place solder flux 9; Adapter 7 is pressed into cylindrical shell 2 with excessive cooperation or interference fit form; The spinning undergauge is carried out in cylindrical shell bottom 26, form the semiclosed inner chamber 28 of cylindrical shell,, apply solder flux, promptly carry out soldering, make solder flux cover undergauge top 27 at undergauge top 27 as considering to improve the sealing reliability at undergauge top 27; With above-mentioned liquid reservoir assembly and heat exchanger assembling to be welded, be positioned in the continuous tunnel furnace, simultaneously to liquid reservoir assembly and Welding of Heat-exchanger moulding; Through high temperature, the solder flux 9 fusing Bing Seepage on adapter fluid hole 72 both sides go into to the contact surface between switching part 70 peripheries and the cylinder inboard wall face 24, in adapter 7 and 2 formation of cylindrical shell portion that is tightly connected reliably, also eliminate the slit between cylindrical shell inlet 21 and the cylindrical shell liquid outlet 22 simultaneously.
Present embodiment has been inherited whole advantages of first embodiment: the argon arc welding operation between cancellation adapter 7 and the cylindrical shell 2, reduced production cost; 2 of adapter 7 and cylindrical shells be for excessively to cooperate or interference fit, in adapter 7 and 2 formation of cylindrical shell portion that is tightly connected reliably, and avoids the gap occurring between cylindrical shell inlet 21 and cylindrical shell liquid outlet 22 oral pores after the solder melts, improves the filter effect to cold-producing medium; Welding sequence between adapter 7 and the cylindrical shell 2, the welding sequence of liquid reservoir assembly and heat exchanger together carries out, and eliminates the secondary heat affecting of adapter 7 and 2 welding positions of cylindrical shell, guarantees welding quality, improves the sealing property of cylindrical shell 2, improves product percent of pass.
In the present embodiment, cancel bottom 1, directly on the section bar of cylindrical shell 2, carried out the spinning undergauge, formed semiclosed inner chamber 28, made that the bottom of cylindrical shell 2 is the one hermetically-sealed construction, improved reliability of structure, and reduced product cost.In addition, apply solder flux, promptly carry out soldering, make solder flux cover undergauge top 27, improve the sealing reliability at undergauge top 27,, improve product percent of pass with the sealing property of further raising cylindrical shell 2 at undergauge top 27.
Present embodiment is the improvement at first embodiment, and obviously, this improvement project also can be used for above-mentioned second, third embodiment, and is identical in view of principle, structure is similar, do not repeat them here.
Above embodiment is illustrated with 77 pairs of liquid reservoirs of the present invention of one or two groove, in fact, liquid reservoir of the present invention also can adopt the groove 77 more than three or three, by placing solder flux 9 at each groove 77, make liquid reservoir assembly and heat exchanger at continuous tunnel furnace welding fabrication together, between adapter 7 and cylindrical shell 2, form the portion that is tightly connected reliably, guarantee that liquid reservoir has excellent sealing performance and filter effect.Be understandable that, when adopting the groove 77 more than three or three, also above-mentioned improvement technical characterictic can be made up, thereby satisfy the requirement of specific occasion.
The manufacture method of liquid reservoir comprises shown in Fig. 3-6,
Parts production procedure:, form all parts of liquid reservoir indispensability according to prior art processing; In the parts that process, wherein aluminum parts are cleaned; Switching part 76 to adapter 7 carries out slot rolling, at adapter fluid hole 72 other at least one groove 77 that form, guarantees that groove 77 positions and size are accurate; In groove 77, place solder flux 9, be the be tightly connected preparatory condition of cylindrical shell 2 with adapter 7; Cylindrical shell 2 and adapter 7 assemblings promptly, are pressed into adapter 7 in the cylindrical shell upper end 23, guarantee that adapter fluid hole 72 is communicated with cylindrical shell liquid outlet 22, are forming the liquid reservoir assembly.
Assembling flow path with heat exchanger: with a liquid reservoir assembly that is ready to and heat exchanger assembling; In continuous tunnel furnace, to cylindrical shell 2 and adapter 7, liquid reservoir assembly and heat exchanger weld simultaneously, i.e. stove weldering; Substandard product is picked out in the leak detection of welding back, to guarantee product quality; Packing forms complete product, so that store, transport.
The manufacture method of above-mentioned liquid reservoir compared with prior art, has been simplified operation, and the welding sequence that is about between welding sequence, liquid reservoir and the heat exchanger between adapter 7 and the cylindrical shell 2 together carries out in continuous tunnel furnace.Specifically: in the groove 77 that processes, place solder flux 9 earlier,, form the liquid reservoir assembly with adapter 7 and cylindrical shell 2 assemblings; With above-mentioned liquid reservoir assembly and heat exchanger assembling to be welded, be positioned in the continuous tunnel furnace, heat exchanging device and the disposable welding fabrication of liquid reservoir assembly promptly carry out the stove weldering simultaneously simultaneously again.The high temperature of process of passing through tunnel stove, solder flux 9 fusing Hou Seepage go into the periphery of switching part 70 and the contact surface between the cylinder inboard wall face 24, the formation portion that is tightly connected reliably between the periphery of switching part 70 and cylinder inboard wall face 24.
The product of Zhi Zaoing according to the method described above, avoided the secondary heat affecting problem after adapter 7 welds with cylindrical shell 2 argon arcs in the prior art, the uniformity that keeps seam organization between cylindrical shell 2 and the adapter 7, guarantee weld strength and bubble-tight stable, improve the product welding quality, improve the cylindrical shell sealing property; And it is other that solder flux 9 is positioned at adapter fluid hole 72, fills up slit between cylindrical shell inlet opening 21 and the cylindrical shell fluid hole 22 after its fusing, and cold-producing medium could be flowed out from cylindrical shell liquid outlet 22 through behind the filter screen 5, thereby improve the filter effect to cold-producing medium.
In addition, for further improving the sealing property of cylindrical shell 2, in the above-mentioned parts production procedure,, form semi-enclosed inner chamber 28 to the 26 spinning necking downs of cylindrical shell bottom; Thus, cylindrical shell bottom 26 is structure as a whole, and its reliability improves; Also apply solder flux, make solder flux evenly cover on the necking down top 27, with the sealing property of further raising cylindrical shell 2 at necking down top 27.
The above only is a preferred implementation of the present invention, should not be construed as limiting the scope of the invention.Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.