CN201707292U - Transversally heated graphite tube - Google Patents
Transversally heated graphite tube Download PDFInfo
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- CN201707292U CN201707292U CN2010202340255U CN201020234025U CN201707292U CN 201707292 U CN201707292 U CN 201707292U CN 2010202340255 U CN2010202340255 U CN 2010202340255U CN 201020234025 U CN201020234025 U CN 201020234025U CN 201707292 U CN201707292 U CN 201707292U
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Abstract
A transversally heated graphite tube comprises a light transmitting annular section and cylindrical sections. The annular section is used for placing a tested sample, the cylindrical sections are connected to two transverse ends of the annular section via transitional sections, a sample platform is arranged on the inner side of the annular section, the annular section, the transitional sections, the cylindrical sections and the sample platform are in an integral structure, the annular section is an annular resistance heating body, the transitional sections are trapezoidal current loader, the cylindrical sections are cylinders with chamfers arranged at the ends, the sample platform is a planar inner bottom surface of the annular resistance heating body, and the width of the plane of the inner bottom surface matches with that of a light path and spot of a graphite furnace type atomic absorption spectrophotometer. The graphite tube is in a continuous structure, avoids the problems of ablation, uneven heating and the like, prolongs the service life without affecting consistency and repeatability of final test results, and further improves accuracy of the test results.
Description
Technical field
The utility model relates to a kind of graphite-pipe that is installed in the horizontal heating graphite type of furnace atomic absorption spectrophotometer (AAS).
Background technology
Horizontal heating graphite type of furnace atomic absorption spectrophotometer (AAS) can be used for fields such as medical treatment, metallurgy, chemical industry, food and carry out trace and trace metal element analysis, laterally the graphite-pipe in the heating graphite type of furnace atomic absorption spectrophotometer (AAS) is the important accessory that can carry out trace and trace metal element analysis, and its performance quality directly influences the accuracy of measurement result.
Laterally the graphite-pipe in the heating graphite type of furnace atomic absorption spectrophotometer (AAS) in the course of the work, obtain heating current by transmitting electrode, under the effect of instantaneous large-current, middle ring bodies is because resistance heating, the heat of ring bodies makes the specimen drop that is placed on the example platform obtain heat in moment by the mode of radiation at this moment, and then atomization, the steam that produces after the sample atomsization must be full of logical light light path, because the heating current direction is vertical with logical light optical path direction, so the graphite-pipe that laterally heats in the graphite type of furnace atomic absorption spectrophotometer (AAS) is commonly referred to as: laterally heat graphite-pipe.
Existing horizontal heating graphite-pipe sketch is referring to Fig. 2, Fig. 3, constitute by existing example platform (b shown in the figure) and graphite-pipe main body (annulus section, transition section, cylindrical section), existing example platform is unsettled placement in annulus section cavity, fix by welding or welding or alternate manner, in the course of the work, on the annulus section in the middle of heating current is carried in by transition section.The shortcoming that this structure exists is: 1. be not that one processing obtains between existing example platform and annulus section, transition section, the cylindrical section, in the atomic absorption spectrophotometer (AAS) course of work, laterally heat the impact that graphite-pipe will bear big electric current, produce the high temperature of moment, inevitably like this can produce contact resistance and the nonsynchronous problem of local thermal expansion, directly performance is exactly local ablation, tube wall or existing example platform crack, and then laterally heat graphite-pipe and scrap, test Halfway Stopping, influence the consistance of final testing result; 2. with reference to a place shown in the figure 2 (a is that existing electric current adds carrier), atomic absorption spectrophotometer (AAS) in the course of the work, laterally heat the impact that graphite-pipe will bear instantaneous large-current, in this process because a place and the rapid variation of resistance has taken place with its similar position, and then cause moment high temperature, owing to there is the rapid variation of sectional area at a place, heat is difficult for leaving, directly performance is exactly that rapid ablation takes place at a place, electric current can not be added on the graphite-pipe main body uniformly under the situation that the generation of a place is ablated, graphite-pipe main body heating is uneven, and then causes the existing example platform inequality of being heated, and influences the repeatability of final testing result; 3. with reference to shown in the figure 3, existing example platform is after adding the specimen drop, owing to can not directly contact between existing example platform and the tube wall, during being heated atomization process in moment, the specimen drop can not well be full of light path, influence the accuracy of final testing result.
The utility model content
The purpose of this utility model provides a kind of horizontal heating graphite-pipe, solve tradition and laterally heat the technical matters that graphite-pipe can influence consistance, repeatability and the accuracy of micro-and the final testing result that trace metal element is analyzed.
For achieving the above object, the utility model adopts following technical scheme: a kind of horizontal heating graphite-pipe, comprise logical light and place specimen the annulus section and by transition section be connected annulus section transverse ends cylindrical section, there is example platform the inboard of annulus section, it is characterized in that: described annulus section, transition section, cylindrical section and example platform are structure as a whole, the annulus section is the ring-type resistance heater, transition section is that trapezoidal electric current adds carrier, cylindrical section is the right cylinder that the end has chamfering, example platform is the inside bottom surface of ring-type resistance heater, this inside bottom surface is a plane, and the light path spot width of the width on plane and graphite type of furnace atomic absorption spectrophotometer (AAS) is complementary.
Described ring-type resistance heater, electric current add carrier, right cylinder and example platform and are formed by machining by the graphite of monoblock, and perhaps one-step mould forms.
Described graphite is pyrolytic graphite, isostatic pressing formed graphite or extruded anisotropic graphite.
Described example platform is connected with the madial wall arc transition of ring-type resistance heater.
The utility model has overcome the deficiencies in the prior art, compared with prior art have following characteristics and beneficial effect: 1, to add carrier be uninterrupted structure to trapezoidal electric current, in the atomic absorption spectrophotometer (AAS) course of work, heating current adds carrier by trapezoidal electric current and is carried on the ring-type resistance heater, owing to be uninterrupted structure, instantaneous large-current in the course of work can not produce ablation, the unequal problem of being heated, and then prolonged serviceable life of graphite-pipe, can not influence the consistance of final testing result.
2, example platform is directly to process on the ring-type resistance heater, can not produce contact resistance in the course of the work and the uneven problem of being heated, and then has prolonged the serviceable life of graphite-pipe, can not influence the repeatability of final testing result.
3, the light path width of the width of example platform and atomic absorption spectrophotometer (AAS) is identical, in test process, place the specimen drop atomization steam on the example platform, can be full of ring bodies inside uniformly along circular arc, and then improve precision of test result with the platform plane transition.
Description of drawings
The utility model is described in more detail below in conjunction with accompanying drawing.
Fig. 1 is the work synoptic diagram of graphite-pipe.
Fig. 2 is the front elevational schematic of the horizontal heating graphite-pipe of prior art.
Fig. 3 is the cross-sectional schematic of the horizontal heating graphite-pipe of prior art.
Fig. 4 is a front elevational schematic of the present utility model.
Fig. 5 is the synoptic diagram that A-A analyses and observe among Fig. 4.
Reference numeral: 1-right cylinder, the trapezoidal electric current of 2-add carrier, 3-ring-type resistance heater, 4-example platform, 5-heating electrode, 6-chamfering, 7-specimen.
Embodiment
Embodiment is referring to Fig. 1, Fig. 4, shown in Figure 5, this horizontal heating graphite-pipe, comprise logical light and place specimen 7 the annulus section and by transition section be connected annulus section transverse ends cylindrical section, there is example platform 4 inboard of annulus section, described annulus section, transition section, cylindrical section and example platform 4 are structure as a whole, the annulus section is a ring-type resistance heater 3, transition section is that trapezoidal electric current adds carrier 2, cylindrical section is the right cylinder 1 that the end has chamfering 6, is used for being connected with heating electrode obtaining heating current; The electric current that the right cylinder of both sides obtains loads body by trapezoidal electric current can be transmitted to middle ring-type resistance heater uniformly.Example platform 4 is the inside bottom surface of ring-type resistance heater 3, this inside bottom surface is a plane, the light path spot width of the width on plane and graphite type of furnace atomic absorption spectrophotometer (AAS) is complementary, and example platform 4 is connected with the madial wall arc transition of ring-type resistance heater 3.Described specimen 7 is placed on the example platform 4.
Described ring-type resistance heater 3, electric current add carrier 2, right cylinder 1 and example platform 4 and are formed by machining by the graphite of monoblock, and perhaps one-step mould forms, and is uninterrupted structure.In mechanical processing process, directly process example platform in ring-type resistance heater inside, described graphite is pyrolytic graphite, isostatic pressing formed graphite or extruded anisotropic graphite.
Solid arrow is the heating current direction among Fig. 1, and dotted arrow is an optical direction.
Claims (4)
1. one kind is laterally heated graphite-pipe, comprise logical light and place specimen the annulus section and by transition section be connected annulus section transverse ends cylindrical section, there is example platform (4) inboard of annulus section, it is characterized in that: described annulus section, transition section, cylindrical section and example platform (4) are structure as a whole, the annulus section is ring-type resistance heater (3), transition section is that trapezoidal electric current adds carrier (2), cylindrical section is the right cylinder (1) that the end has chamfering (6), example platform (4) is the inside bottom surface of ring-type resistance heater (3), this inside bottom surface is a plane, and the light path spot width of the width on plane and graphite type of furnace atomic absorption spectrophotometer (AAS) is complementary.
2. want 1 described a kind of horizontal heating graphite-pipe according to right, it is characterized in that: described ring-type resistance heater (3), electric current add carrier (2), right cylinder (1) and example platform (4) and are formed by machining by the graphite of monoblock, and perhaps one-step mould forms.
3. a kind of horizontal heating graphite-pipe according to claim 2, it is characterized in that: described graphite is pyrolytic graphite, isostatic pressing formed graphite or extruded anisotropic graphite.
4. a kind of horizontal heating graphite-pipe according to claim 1 is characterized in that: described example platform (4) is connected with the madial wall arc transition of ring-type resistance heater (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202340255U CN201707292U (en) | 2010-06-23 | 2010-06-23 | Transversally heated graphite tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202340255U CN201707292U (en) | 2010-06-23 | 2010-06-23 | Transversally heated graphite tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707292U true CN201707292U (en) | 2011-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202340255U Expired - Fee Related CN201707292U (en) | 2010-06-23 | 2010-06-23 | Transversally heated graphite tube |
Country Status (1)
| Country | Link |
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| CN (1) | CN201707292U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589083A (en) * | 2017-08-14 | 2018-01-16 | 北京普析通用仪器有限责任公司 | Lead and cadmium elements are the same as the Atomic Absorption Spectrometer and detection method surveyed in a kind of grain |
| WO2018177504A1 (en) * | 2017-03-27 | 2018-10-04 | Schunk Kohlenstofftechnik Gmbh | Tube furnace device for an atomizing furnace |
-
2010
- 2010-06-23 CN CN2010202340255U patent/CN201707292U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018177504A1 (en) * | 2017-03-27 | 2018-10-04 | Schunk Kohlenstofftechnik Gmbh | Tube furnace device for an atomizing furnace |
| US11047802B2 (en) | 2017-03-27 | 2021-06-29 | Schunk Kohlenstofftechnik Gmbh | Tube furnace device for an atomizing furnace |
| CN107589083A (en) * | 2017-08-14 | 2018-01-16 | 北京普析通用仪器有限责任公司 | Lead and cadmium elements are the same as the Atomic Absorption Spectrometer and detection method surveyed in a kind of grain |
| CN107589083B (en) * | 2017-08-14 | 2020-04-28 | 北京普析通用仪器有限责任公司 | Atomic absorption spectrometer for simultaneously detecting lead and cadmium elements in grains and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20150623 |
|
| EXPY | Termination of patent right or utility model |