CN204680695U - A kind of for the multi-cascade thermoelectric arm under large temperature difference environment - Google Patents
A kind of for the multi-cascade thermoelectric arm under large temperature difference environment Download PDFInfo
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- CN204680695U CN204680695U CN201520343756.6U CN201520343756U CN204680695U CN 204680695 U CN204680695 U CN 204680695U CN 201520343756 U CN201520343756 U CN 201520343756U CN 204680695 U CN204680695 U CN 204680695U
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Abstract
The utility model discloses a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, this multi-cascade thermoelectric arm is for the manufacture of the group serial type multi-cascade temperature-difference power generation module worked under high-temperature gradient condition or device; Be welded by multiple thermoelectric material, solder side is process the periodic surperficial notching construction obtained; Welding manner is soldering, by the periodic surface texture of preprocessing on the solder side of thermoelectric material, can improve the contact area of solder, be convenient to the eliminating of scaling powder simultaneously, the impact of remaining scaling powder is dropped to reduced levels; By above-mentioned welding method, the contact resistance between thermoelectric material and thermoelectric material and thermal resistance can be effectively reduced, and are conducive to the power efficiency improving multi-cascade thermo-electric generation.
Description
Technical field
The utility model belongs to technical field of thermoelectricity, particularly a kind of for the multi-cascade thermoelectric arm under large temperature difference environment.
Background technology
Thermoelectric device refers to an electron-like element that directly can realize electric energy and heat energy and mutually change, thermoelectricity (thermoelectric) module that its core is got up to form by the thermoelectric material connection in series-parallel organizing different carrier type more.The application of the thermoelectric device history of existing more than 100 year so far, is mainly used for detecting temperature, such as thermocouple in early days.Afterwards along with the exploitation of high performance thermoelectric material, be used to again the fields such as electron temperature-control, waste-heat power generation and space flight battery pack.Over nearly 20 years, thermoelectric device receives in waste heat recovery thermo-electric generation field and pays close attention to more and more widely.U.S., moral, Deng state in succession develop multiple cover technical scheme, and are applied to the fields such as compact power, waste incineration and generating electricity and geothermal utilization.
The temperature range of industrial exhaust heat is generally at about 200 ~ 800C, and the industrial exhaust heat of higher temperature can produce the higher temperature difference, thus significantly improves efficiency and the power of thermo-electric generation.But the operating temperature range of general thermoelectric material the best only has about 100 ~ 200C, the gradient high performance therefore in order to realize heat-source energy utilizes, and multiple thermoelectric material can be together in series, composition multi-cascade electrothermal module.
Multi-cascade electrothermal module mainly contains two kinds of structures, one is that different types of thermoelectric material is made into electrothermal module respectively, and then they are together in series (laminated construction) along temperature gradient direction, another kind is directly together in series by different thermoelectric material, encapsulates together, is made into electrothermal module (group string structure).Two kinds of structures respectively have quality, and the former technique is comparatively simple, applying flexible, but are inconvenient to carry out the unified output of power, and thermal losses is comparatively large and integrated level is lower, is generally applicable to compact low power generating; The latter's integrated level is high, and external output interface is convenient less to be installed, and does not almost have thermal loss, but manufacture craft difficulty is higher, is generally applicable to integrated form Electricity Generation.The utility model, for the second structure, serves primarily in thermo-electric generation application that is high-power, high integration.
Thermoelectric material is alloy, solid solution or ceramic material normally, and the connection between thermoelectric material not of the same race is a manufacturing process testing very much technological level.This is because the intensity connected, resistance and thermal resistance all can cause very large impact to the generating efficiency of electrothermal module and reliability.The thermoelectric material interconnection technique of current main flow mainly contains integral sintering (melting) and welding two kinds.Integral sintering (melting) technology refers to and the thermoelectric material powder not of the same race mode according to series connection lamination is pressed in a mold, then heats one-shot forming.Welding is generally referred to and to be coupled together by bi-material by the method for soldering.The contact resistance of integral sintering technique and thermal resistance are all smaller, but greatest problem is the performance that expendable material possibly prepared at identical conditions by two or more thermoelectric materials.Comparatively speaking, prepare thermoelectric material respectively and weld and can ensure that often kind of material is prepared under the temperature and time condition of the best, thermoelectricity capability is higher, and the technique of welding is also simpler.If effectively can reduce welding kesistance, the method for welding will be applicable to large-scale industrial production more.
Summary of the invention
In order to overcome above-mentioned prior art Problems existing, the purpose of this utility model is to provide a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, the utility model thermoelectric arm can effectively reduce contact resistance and thermal resistance, make it reach or close to one sinter molding level.
In order to achieve the above object, the utility model adopts following technical scheme:
For the multi-cascade thermoelectric arm under large temperature difference environment, described multi-cascade thermoelectric arm is welded by multiple thermoelectric material, and often kind of thermoelectric material corresponds to different warm area ranges of application, and solder side is process the periodic surperficial notching construction obtained.
The mode of described welding is soldering, and the density of the scaling powder in solder is well below solder metal.
The length of often kind of thermoelectric material is determined by the physical property of material.
Described periodic surface texture is periodic serrations shape structure, and the cycle of sawtooth and width, being about 0.2 ~ 2mm, specifically depend on the size of multi-cascade thermoelectric arm; Subtended angle 2 θ 1 of sawtooth is 45 ° ~ 120 °.The selection principle of the subtended angle of described sawtooth is: the solder of good fluidity can select less subtended angle, reduces resistance and thermal resistance better effects if like this; The bad solder of mobility needs to select larger subtended angle.
Described periodic surface texture is periodic trapezoidal-type structure.
Described periodic surface texture be periodic trapezoidal-type upper base on superimpose rectangles formed structure.
Manufacture method for the multi-cascade thermoelectric arm under large temperature difference environment described above, the tip of grinding-shaping is adopted to be that the blade of V-knife mouth is in the cutting of thermoelectric material surface, the thickness of blade is equal to or less than the thickness of fluting, and cutter during cutting between every cutter is apart from the cycle and the width that are equal to or greater than fluting; Before completing in cutting, welding, thermoelectric material is carried out ultrasonic cleaning, with the cutting detritus washing thermoelectric material surface off or the burr do not peeled off completely, is conducive to follow-up welding job.
If thermoelectric material is lamellar tissue, in order to avoid interlayer dissociates, then add machete distance, form platform, thus avoid stress to concentrate.
If thermoelectric material itself is softer, easily there is plastic deformation, can become round at fluting cutting rear tip, cause not easily to fork, then carry out second time cutting, utilize less processing capacity to form sharp-pointed serrated tip.
Compared to the prior art comparatively, the utility model possesses following advantage:
1, the periodic surperficial notching construction main advantage that the utility model adopts is 2 points.The first, improve the contact area of weld layer, thus reduce total articulamentum resistance.Such as weld layer resistivity is ρ (Ω m
2), flat contact surface becomes S (m
2), then the articulamentum resistance of common welding is ρ/S (m
2), the articulamentum resistance adopting the utility model structure is ρ/sin θ
1s (m
2).The second, decrease the impact of the scaling powder that do not volatilize.When bi-material welds face-to-face, may not volatilize completely after the scaling powder fusing in solder, particularly more not volatile closer to the solder in the middle part of contact-making surface, it will stay material internal after high temperature cabonization, forms high-resistance defect.The utility model, because the density of scaling powder is well below solder metal, therefore will float over above metal liquid after being melted down.For plane contact, scaling powder and solder metal define series resistance, substantially increase the resistance of weld layer; And for surface texture of the present utility model, scaling powder concentrates on the top of sawtooth, and solder metal defines parallel connection, little to the Resistance Influence of weld layer.Further, if the top of sawtooth is enough sharp-pointed, capillary seepage effect will be introduced, and promote liquid scaling powder exterior surface flowing (along vertical paper direction) of mid portion, thus accelerate the evaporation rate of scaling powder, reduce resistance further.
2, the surface texture involved by the utility model is obtained by precision machined method, adopt the method for high speed slide plate in the cutting of thermoelectric material surface, the tip of cutter adopts the V-knife mouth of special grinding-shaping, the thickness of blade is equal to or slightly less than the width of fluting, and cutter during cutting between every cutter is apart from the width being equal to or greater than fluting.Adopt other technique, such as wet etching, thermoelectric material die casting etc., also can process above structure.But consider from the angle of cost and productivity ratio, accurate patterning method is a kind of implementation method of comparative optimization.
Accompanying drawing explanation
Fig. 1 is multi-cascade thermoelectric arm involved by the utility model and solder side enlarged drawing thereof.
Fig. 2 is the comparison diagram of thermoelectric material solder side involved by the utility model and common solder side.
Fig. 3 is a kind of embodiment A (being applicable to ordinary hot electric material) of the solder side involved by the utility model.
Fig. 4 is a kind of Embodiment B (being applicable to the thermoelectric material easily occurring to dissociate between interior layer) of the solder side involved by the utility model.
Fig. 5 is a kind of Embodiment C (being applicable to process the higher thermoelectric material of deformation ratio) of the solder side involved by the utility model.
Fig. 6 is a kind of embodiment D (be applicable to can occur to dissociate between interior layer, and process the higher thermoelectric material of deformation ratio) of the solder side involved by the utility model.
Fig. 7 is a kind of processing method of solder side.
Embodiment
Execution mode of the present utility model is described in detail below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model is a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, described multi-cascade thermoelectric arm is welded by multiple thermoelectric material, often kind of thermoelectric material corresponds to different warm area ranges of application, is made up of higher temperatures district thermoelectric material, comparatively low-temperature space thermoelectric material and weld layer.Solder side is process the periodic surperficial notching construction obtained.
As preferred implementation of the present utility model, the cycle of sawtooth and width, being 0.2 ~ 2mm, specifically depend on the size of multi-cascade thermoelectric arm; Subtended angle 2 θ 1 of sawtooth is 45 ° ~ 120 °, needs to determine according to the proterties of solder, and the solder of good fluidity can select less subtended angle, reduces resistance and thermal resistance better effects if like this; The bad solder of mobility needs to select larger subtended angle, otherwise during welding cannot effectively by two kinds of thermoelectric materials to forking, easily cause the blocked up resistance of weld layer to increase.
The mode of described welding is soldering, and the density of the scaling powder in solder is well below solder metal.As shown in Figure 2, surface texture of the present utility model makes scaling powder concentrate on the top of sawtooth, and solder metal defines parallel connection, little to the Resistance Influence of weld layer.Further, if the top of sawtooth is enough sharp-pointed, capillary seepage effect will be introduced, and promote liquid scaling powder exterior surface flowing (along vertical paper direction) of mid portion, thus accelerate the evaporation rate helping welding, reduce resistance further.
The length of often kind of thermoelectric material is determined by the physical property of material, can calculate according to Optimized Simulated.
As shown in Figure 3, this periodic surface texture is a kind of general surface texture-periodic serrations shape structure, and the inclination angle of V-type cutting tool is θ 1, and cutter is wide is d1 with cutter spacing.
Fig. 4 is a kind of derived structure of Fig. 3, is applicable to the thermoelectric material easily occurring to dissociate between interior layer.The inclination angle of V-type cutting tool is θ 1, and cutter is wide is d1, and cutter spacing is d1+d2.The stress that this configuration avoids V-type groove tip is concentrated.
Fig. 5 is a kind of derived structure of Fig. 3, is applicable to process the higher thermoelectric material of deformation ratio.The inclination angle of V-type cutting tool is θ 1, and cutter is wide is d1, and cutter spacing is d1+d2.After first time has cut, utilize inclination angle for θ 2, width is that the thin slice cutter of d2 is again mended and cut, and cutter spacing is still d1+d2.Process avoids once the plastic deformation under large processing capacity.This distortion may cause fluting cutting rear tip to become circle, not easily to fork during welding.
Fig. 6 is a kind of derived structure of Fig. 3, this periodic surface texture be periodic trapezoidal-type upper base on superimpose rectangles formed structure.Dissociate between interior layer for occurring, and the thermoelectric material that processing deformation ratio is higher.The inclination angle of V-type cutting tool is θ 1, and cutter is wide is d1, and cutter spacing is d1+d2.After first time has cut, width has been that the thin slice right angle cutter of d2 is again mended and cut, and cutter spacing is still d1+d2.Process avoids once the plastic deformation under large processing capacity, the stress simultaneously avoiding groove tip is concentrated.
As shown in Figure 7, for the processing mode of the shape of periodic serrations shown in Fig. 3 structure, adopt the method for high speed slide plate in the cutting of thermoelectric material surface, the tip of cutter adopts the V-knife mouth of special grinding-shaping, the thickness of blade is equal to or slightly less than the width of fluting, and cutter during cutting between every cutter is apart from the width equaling to slot.
Claims (6)
1. one kind for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: described multi-cascade thermoelectric arm is welded by multiple thermoelectric material, often kind of thermoelectric material corresponds to different warm area ranges of application, and solder side is process the periodic surperficial notching construction obtained.
2. according to claim 1 a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: the mode of described welding is soldering, and the density of the scaling powder in solder is well below solder metal.
3. according to claim 1 a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: the length of often kind of thermoelectric material is determined by the physical property of material.
4. according to claim 1 a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: described periodic surface texture is periodic serrations shape structure, the cycle of sawtooth and width, being about 0.2 ~ 2mm, specifically depend on the size of multi-cascade thermoelectric arm; Subtended angle 2 θ 1 of sawtooth is 45 ° ~ 120 °.
5. according to claim 1 a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: described periodic surface texture is periodic trapezoidal-type structure.
6. according to claim 1 a kind of for the multi-cascade thermoelectric arm under large temperature difference environment, it is characterized in that: described periodic surface texture be periodic trapezoidal-type upper base on superimpose rectangles formed structure.
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| CN201520343756.6U CN204680695U (en) | 2015-05-25 | 2015-05-25 | A kind of for the multi-cascade thermoelectric arm under large temperature difference environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868044A (en) * | 2015-05-25 | 2015-08-26 | 中国华能集团清洁能源技术研究院有限公司 | Multi-cascade thermoelectricity arm under large temperature difference environment and manufacture method thereof |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868044A (en) * | 2015-05-25 | 2015-08-26 | 中国华能集团清洁能源技术研究院有限公司 | Multi-cascade thermoelectricity arm under large temperature difference environment and manufacture method thereof |
| CN104868044B (en) * | 2015-05-25 | 2018-11-09 | 中国华能集团清洁能源技术研究院有限公司 | A kind of multi-cascade thermoelectric arm and its manufacturing method under big temperature difference environment |
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