CN201503235U - Exhaust gas recirculation cooler and heat dissipation turbulence fin thereof - Google Patents
Exhaust gas recirculation cooler and heat dissipation turbulence fin thereof Download PDFInfo
- Publication number
- CN201503235U CN201503235U CN2009201173214U CN200920117321U CN201503235U CN 201503235 U CN201503235 U CN 201503235U CN 2009201173214 U CN2009201173214 U CN 2009201173214U CN 200920117321 U CN200920117321 U CN 200920117321U CN 201503235 U CN201503235 U CN 201503235U
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- fin
- exhaust gas
- cooler
- recycled exhaust
- egr cooler
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Abstract
The utility model discloses a cooling pipe with a ladder type heat dissipation fin and a heat dissipation fin combined type exhaust gas recirculation cooler, which is a plate-fin EGR cooler. Compared with the traditional shell-and-tube EGT cooler, the plate-fin EGR cooler is more compact and has better heat dissipation efficiency; meanwhile, the problem of insufficient heat dissipation capacity of the plate-fin EGR cooler with build-in straight and corrugated-type turbulence fins is solved by the plate-fin EGR cooler. A novel turbulence heat dissipation fin with a ladder type structure is adopted in the plate-fin EGR cooler, the plate-fin EGR cooler has better heat transmission effect compared with the EGR cooler with straight fin and the heat dissipation fins which are similar to sinusoidal corrugation, meanwhile, the resistance increasing range can be controlled within a tolerance range, and the problem of fin blocking can not happen when the plate-fin EGR cooler is used for a long time. The plate-fin EGR cooler is composed of an air inlet and outlet pipe, an inlet and outlet chamber and an EGR cooler core, wherein, the core is formed by assembling and welding a connecting plate, an outer shell body, the cooling pipe and the ladder type heat dissipation turbulence fin sequentially by adopting a method.
Description
Technical field
What the utility model patented product related to is a kind of vehicle motor cooler for recycled exhaust gas, i.e. cooler for recycled exhaust gas.
Background technology
Because international and domestic Abgasgesetz is strict day by day, cooler for recycled exhaust gas has begun to become an important indispensable part in the engine-cooling system in cooling system of vehicle, and vehicle motor adopts EGR Technology to reduce NO
XDischarging, thereby reach the requirement of Abgasgesetz, yet because EGT is higher, when turning back to the combustion chamber, destruction is played in burning to engine on the contrary, and high temperature is easy to generate oxynitrides equally, and engine works take to assemble the temperature that cooler for recycled exhaust gas reduces EGR gas for this reason, solve the high-temp combustion phenomenon, make emission compliance.In cooler for recycled exhaust gas, all adopt cooling fluid or water high-temp waste gas to be cooled off basically as low-temperature receiver.Hot fluid (waste gas) is in the heat exchanger internal flow, cooling fluid is in flows outside, in this heat transfer process, the control thermal resistance of whole heat exchanger mainly is distributed in exhaust gas side, and the heat transfer coefficient that therefore improves the exhaust gas side heat exchange surface becomes the key issue of the heat exchange power that improves cooler for recycled exhaust gas.The plate-fin cooler for recycled exhaust gas that structure is compact has more become the cooler for recycled exhaust gas development trend at present.And automobile-used heat exchanger gas side radiating fin commonly used at present mainly is straight radiating fin, shutter radiating fin, side set radiating fin and ripple radiating fin etc.Because shutter radiating fin and side set radiating fin also cause the rapid increase of gas flow resistance and then cause the increase of fan power increase and engine consumption in efficient heat transfer, in addition because shutter radiating fin and side set type radiating fin (are contained promising dust granules thing by dust and particle obstruction easily in the waste gas behind the engine combustion, sulfide, materials such as water vapour, they form the material of carbon distribution and one deck acidity easily in the heat-delivery surface of heat exchanger), produce bigger thermal resistance at the cooler for recycled exhaust gas heat exchange surface, and then cause heat dispersion sharply to descend, even the local high temperature that produces, the reliability of reduction EGR.Therefore shutter is used under the relative abominable operating mode of working environment with side set type radiating fin and is greatly limited, though straight and ripple radiating fin overcomes blocking problem, but because nearly stage industry constantly proposes higher heat radiation requirement to each heat exchanger, and require heat exchanger compact more simultaneously, and straight radiating fin can't satisfy the requirement of high heat dissipation capacity, and the ripple radiating fin improves limited because of heat transfer property, also cause the design size of heat exchanger excessive, this causes again and the bulk of enging cabin and the contradiction of structural configuration requirement for restriction.Practical project background and Technical Development Requirement press for a kind of novel efficient cooler for recycled exhaust gas of exploitation, to satisfy the requirement of vehicular discharge and high efficiency and heat radiation in sum.
Find through literature search, the patent No. is a kind of cooler for recycled exhaust gas of 200580046952.6, adopt tabs formula structure, cooling water can be evenly distributed to each part, effectively avoid boiling, it inserts a kind of radiating fin in the waste gas runner, this fin is similar sine bellows form, i.e. corrugated fin on exhaust gas flow direction.The same patent No. is a kind of cooler for recycled exhaust gas of 200710147116.8, this patent a plurality of flat tubes that be arranged in parallel, each flat tube have end sealing and communicate, and radiating fin is set in each flat tube constitutes core body, its used fin is a form of straight lines on exhaust gas flow direction, is plain fin.Cooler for recycled exhaust gas as mentioned above, at the straight or rippled fin of the many employings of exhaust steam passage, plain fin be because version can not strengthen disturbance to waste gas, and heat dispersion is limited, equally also carbon distribution (it is relatively large boundary layer flow district thickness to occur at fin surface waste gas) easily.Rippled fin avoid stopping up increase disturbance aspect tangible effect is all arranged, but along with the progressively raising of industry to the requirement of cooler for recycled exhaust gas heat dispersion, though the common relatively straight radiating fin of corrugated fin has higher heat-transfer effect, but its heat-transfer effect can't satisfy harsher heat radiation requirement, particularly requires seem on the higher operating mode occasion comparatively outstanding (as gas recovery system) at some heat dispersion.Traditional rippled fin is slightly inadequate in design, increase of cooler volume and weight increase etc. progressively occur and is unfavorable for the problem that cost reduces.The cooler for recycled exhaust gas that this patent relates to is a kind of plate-fin cooler for recycled exhaust gas with trapezoidal-structure radiating fin, it can be realized with the design of above-mentioned patent equally, the ladder type radiating fin that assembles in the cooling flat tube of the plate-fin cooler for recycled exhaust gas of this patent has better flow-disturbing effect, destroy the growth in boundary layer, can simultaneously flow resistance there be obvious influence by the heat transfer coefficient of effective raising exhaust gas side.
Summary of the invention
The utility model patent is at above technical deficiency, a kind of plate-fin cooler for recycled exhaust gas with radiating fin of improved structure is provided, it can effectively avoid the blockage problem brought owing to work under bad environment, increase under the little situation at the exhaust gas side resistance simultaneously, effectively improve the coefficient of heat transfer of exhaust gas side heating surface, augmentation of heat transfer is realized reducing the high-efficiency compact design feature of whole cooler for recycled exhaust gas raw-material consumption again and improve its reliability.
The technical scheme that addresses the above problem employing is: a kind of cooler for recycled exhaust gas comprises fin body with the turbulent fin of heat radiation, it is characterized in that the cross section of fin is trapezoidal-structure.
The utility model also will provide a kind of cooler for recycled exhaust gas, comprise the import tracheae that connects successively, inlet plenum, the fuse assembly, outlet chamber and outlet tracheae, described fuse assembly comprises the turbulent fin of heat radiation, cooling tube, connecting plate, shell body, import water pipe and outlet water pipe, it is characterized in that described cooling tube is a flat tube, a plurality of cooling tube stacked arrangement are in shell body, two ends are inserted in the punching of offering on the corresponding connecting plate fixing, and with described inlet plenum and outlet chamber's conducting, be equipped with the turbulent fin of heat radiation in each cooling tube, the cross section of the turbulent fin of described heat radiation is trapezoidal-structure, described a pair of connecting plate is separately fixed at the shell body two ends, and described import water pipe and outlet water pipe are arranged on the described shell body.
Be distributed with a plurality of ellipse around boss between the adjacent cooling tube, to strengthen fuse intensity and increasing flow-disturbing to outside water.
Described ladder type radiating fin has the ladder shaped corrugation cycle variation characteristics identical with the ripple radiating fin, and the plumb cut of ladder type heat-radiation belt on hot side gas flow direction is rectangle, and the cross section on gas flow direction is the trapezoidal-structure that changes in the cycle.
The wavelength of described ladder type radiating fin is 8-12mm, heat-radiation belt thickness 0.12-0.15mm.
Described ladder type radiating fin height is 3-5mm.
Described ladder type radiating fin length L d is 40-200mm, and length can be adjusted according to the cooler for recycled exhaust gas length variations of reality, also can be to place before and after several the fins, to realize the product of different EGR specifications.
Described ladder type radiating fin width can gradually change according to cooling tube mouth of pipe width difference, and the ladder type radiating fin can be generally 40～140mm by the punching press one-shot forming.
Described connecting plate thickness 1.8-3mm, connecting plate width 45-160mm.
Described hot-side channel is oval flat tube, pipe thickness 0.3-0.7mm, mouth of pipe width 40-140mm.
Be welded into the cooler for recycled exhaust gas fuse by soldering tech between described connecting plate, cooling flat tube, ladder type radiating fin and the outer shell construction, fuse thickness and fuse height can carry out the series adjusting according to cooling flat tube length and mouth of pipe width.
In the described cold side passage boss structure is set or the radiating fin (for example shift type fin) of some is set, under the prerequisite that guarantees reliability, fin density for well, prevents that the cold side resistance is excessive with sparse.
Described import and export chamber is by punching press or welding fabrication, and itself and cooler for recycled exhaust gas fuse are welded into whole cooler for recycled exhaust gas assembly by argon arc.
The placement that superposes successively of described cooling flat tube requires freely to adjust the number of cooling flat tube according to the bulk of reality; 5～10 layers of general ranges, in usual range, the coefficient of heat transfer of avoiding low flow velocity to bring reduces and fin surface carbon distribution ash with the waste gas flow velocity in the assurance pipeline.
In the cooler for recycled exhaust gas hot-side channel inside that above-mentioned each parts are formed, waste gas with higher temperature enters inlet plenum from the import tracheae, be assigned to then in each hot-side channel, in hot-side channel, high-temp waste gas is by carrying out the heat transmission between inboard ladder type radiating fin and tube wall and the outside cooling fluid.In the cold side passage, cooling fluid with certain flowing velocity is surrounded outside cooling tube and hot-side channel, cooled waste gas enters outlet chamber, flow in the engine charge loop by the outlet tracheae then, part waste gas behind the engine combustion enters inlet plenum after entering into cooler for recycled exhaust gas import tracheae once more through pipeline again, realizes the lasting cooling of waste gas circulation.In hot-side channel, the ladder type radiating fin that is provided with can strengthen the disturbance to waste gas, destroy the growth of waste gas at ladder type fin surface flow boundary layer, effectively reduce the thickness of thermal boundary layer, thereby can realize good augmentation of heat transfer, and realize that the gas collateral resistance increases little or makes being increased in the controlled range of resistance.
The radiating fin that the utility model patented product adopts with trapezoidal-structure form, with respect to the traditional straight radiation fin structure and the cooler for recycled exhaust gas of ripple radiation fin structure, the utility model patent cooler for recycled exhaust gas can be under the less situation of exhaust gas side fluid flow resistance, effectively improve heat transfer property, as under the requirement that realizes identical heat dissipation capacity, the utility model patent can realize reducing the consumption of material and the reduction of cost, and the fuse size of product can freely be adjusted as requested, save the mould development expense, help mass production.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 cooler for recycled exhaust gas assembly structure schematic diagram;
Fig. 2 cooler for recycled exhaust gas core structures schematic diagram;
Fig. 3 EGR cooling flat tube modular construction schematic diagram;
Fig. 4 ladder type radiation fin structure schematic diagram;
Fig. 5 ladder type radiating fin and ripple type radiating fin heat transfer j factor comparison diagram;
Fig. 6 ladder type radiating fin and ripple type radiating fin heat transfer coefficient comparison diagram;
Fig. 7 ladder type radiating fin and ripple type radiating fin resistance f factor comparison diagram;
Fig. 8 ladder type radiating fin and ripple type radiating fin resistance performance comparison diagram.
The specific embodiment
The present embodiment is to implement under the prerequisite in the utility model patented product technology, has provided detailed embodiment and process, but the protection domain of the utility model patented product is not subject to following embodiment.
As shown in Figure 1, the present embodiment comprises: import tracheae 1, inlet plenum 2, fuse assembly 5, outlet chamber 6 and outlet tracheae 7.
As shown in Figure 2, fuse assembly 5 is made up of following structure: the heat radiation turbulent flow fin 11, cooling tube 10, connecting plate 9, import water pipe 3, outlet water pipe 8 and the housing 4 that are trapezoidal-structure.
Described fuse assembly connects by following method: cooling flat tube 10 is inserted in the hole of connecting plate 9 in order, soldering has the oval boss (also can be other help to conduct heat and improve the structure of reliability) of some between the tube wall of cooling flat tube 10, the heat radiation turbulent flow fin 11 of trapezoidal-structure is placed on cooling flat tube 10 inside, housing 4 is welded as integral body with cooling flat tube 10 by connecting plate 9, housing 4 is provided with import water pipe 3 and outlet water pipe 8, said structure is connected to integral body by solder technology, forms cooler for recycled exhaust gas fuse assembly 5.
As shown in Figure 3, the heat radiation of trapezoidal-structure turbulent flow fin 11 is placed on flat 10 inside of cooling tube, is welded as whole cooling tube assembly by soldering tech.
As shown in Figure 4, the heat radiation of described ladder type turbulent flow fin 11, the cross section of its trapezoidal-structure on the vertical direction on the exhaust gas flow direction is rectangle, the trapezoidal-structure form that changes for the cycle on exhaust gas flow direction.
The heat radiation turbulent flow fin 11 of described ladder type, an one complete wavelength is 8-12mm, radiating fin thickness is 0.12-0.15mm.
The heat radiation turbulent flow fin 11 of described ladder type, it highly is 3-5mm.
The heat radiation turbulent flow fin 11 length L d of described ladder type are 40-200mm, and length can be adjusted according to the cooler for recycled exhaust gas length variations of reality, also can be to place before and after several the fins, to realize the product of different EGR specifications.
Heat radiation turbulent flow fin 11 width of described ladder type can gradually change according to cooling flat tube mouth of pipe width difference, and the heat radiation turbulent flow fin 11 of ladder type can be generally 40～140mm by the punching press one-shot forming.
Described connecting plate 9 thickness 1.8-3mm, connecting plate width 45-160mm.
Described cooling tube 10 is oval flat tube, pipe thickness 0.3-0.7mm, mouth of pipe width 40-140mm.
Described cooling flat tube 10 cold sides are provided with boss structure.
The heat radiation of described ladder type turbulent flow fin 11 and connecting plate 9, cooling flat tube 10 are welded into integral body by soldering tech.
Described cooler for recycled exhaust gas fuse 5 is owing to the length and the mouth of pipe width of the turbulent fin 11 of the heat radiation of ladder type, connecting plate 9 and cooling flat tube 10 can freely be adjusted, so fuse 5 length and thickness can freely be adjusted equally.
Described inlet plenum 2 and outlet chamber 6 are punching press or welding forming, are welded into the cooler for recycled exhaust gas finished product with cooler for recycled exhaust gas fuse 5 by argon arc welding.
Described import tracheae 1, its length are 30-90mm, and its diameter is 30-60mm.
Described outlet tracheae 7, its length are 30-90mm, and its diameter is 30-60mm.
Described cooling flat tube 10, quantity can free adjustment according to the different designs requirement.5～10 layers of general ranges, in usual range, the coefficient of heat transfer of avoiding low flow velocity to bring reduces and fin surface carbon distribution ash with the waste gas flow velocity in the assurance pipeline.
The various component materials of the implementation case all adopt stainless steel material.
The inside of the cooler for recycled exhaust gas of forming in various mentioned components, the waste gas that has behind the engine combustion of high-temperature enters inlet plenum 2 from import tracheae 1, be assigned in the hot-side channel then, in hot-side channel, the high temperature pressurised air by ladder type heat radiation turbulent flow fin 11 and cooling flat tube 10 cooling fluid or water transmit heat laterally, in the cold side passage, cooling fluid or water with certain flowing velocity surround hot-side channel, cooled waste gas enters outlet chamber 6, enter in the pipeline of engine charge loop by outlet tracheae 7 then, enter into import tracheae 1 by the engine exhaust pipeline once more at hot side waste gas, enter then in the inlet plenum 2, form lasting cooling high-temp waste gas.In hot-side channel, the heat radiation turbulent flow fin 11 of the ladder type that is provided with can strengthen the disturbance to waste gas, destroy the growth in boundary layer, effectively reduce the thickness of thermal boundary layer, thereby can realize good augmentation of heat transfer, simultaneously because increasing to the disturbance of air-flow, has destroyed the advantage that carbon distribution forms, the generation that helps to alleviate cooler for recycled exhaust gas carbon distribution when work.
Fig. 5, Fig. 6, Fig. 7 and Fig. 8 are by after the numerical simulation calculation, the heat transfer of ripple radiating fin and ladder type radiating fin 11 and resistance performance contrast.As can be seen from Figure 5 the heat transfer factor j of the heat radiation of ladder type turbulent flow fin 11 is better than the heat transfer factor j effect of ripple radiating fin, the as can be seen from Figure 7 f factor of ladder type radiating fin 11 big than ripple radiating fin, but as can be seen in conjunction with Fig. 8, the flow resistance of ladder type radiating fin 11 is not very high, can meet the demands fully.Can draw ladder type radiating fin 11 in conjunction with Fig. 5, Fig. 6, Fig. 7 and Fig. 8 and have and strengthen to conduct heat, and resistance can be controlled at the characteristics in the permissible value scope, therefore can realize augmentation of heat transfer, the purpose that reduces cost.
Claims (8)
1. a cooler for recycled exhaust gas comprises fin body with the turbulent fin of heat radiation, it is characterized in that the cross section of fin is trapezoidal-structure.
2. cooler for recycled exhaust gas, comprise the import tracheae (1) that connects successively, inlet plenum (2), fuse assembly (5), outlet chamber (6) and outlet tracheae (7), described fuse assembly (5) comprises heat radiation turbulent fin (11), cooling tube (10), connecting plate (9), shell body (4), import water pipe (3) and outlet water pipe (8), it is characterized in that described cooling tube (10) is a flat tube, a plurality of cooling tubes (10) stacked arrangement is in shell body (4), two ends are inserted in the punching of offering on the corresponding connecting plate (9) fixing, and with described inlet plenum (2) and outlet chamber (6) conducting, be equipped with heat radiation turbulent fin (11) in each cooling tube (10), the cross section of the turbulent fin of described heat radiation (11) is trapezoidal-structure, described a pair of connecting plate (9) is separately fixed at shell body (4) two ends, and described import water pipe (3) and outlet water pipe (8) are arranged on the described shell body (4).
3. a kind of cooler for recycled exhaust gas as claimed in claim 2 is characterized in that being distributed with a plurality of ellipse around boss between the adjacent cooling tube (10).
4. a kind of cooler for recycled exhaust gas as claimed in claim 2, it is characterized in that the turbulent fin of described heat radiation (11) has the ladder shaped corrugation cycle variation characteristics identical with corrugated fin, its plumb cut on hot side exhaust gas flow direction is a rectangle, and the cross section on hot side exhaust gas flow direction is the trapezoidal-structure that changes in the cycle.
5. a kind of cooler for recycled exhaust gas as claimed in claim 2, the wavelength that it is characterized in that the turbulent fin of described heat radiation (11) is 8-12mm, and its thickness is 0.12-0.15mm, highly is 3-5mm, length L d is 40-200mm, by punching press or rolling one-shot forming.
6. a kind of cooler for recycled exhaust gas as claimed in claim 2 is characterized in that shell body (4) and import water pipe (3) fixedly connected by solder technology with outlet water pipe (8).
7. a kind of cooler for recycled exhaust gas as claimed in claim 2 is characterized in that cooling tube (10) pipe thickness 0.3-0.7mm, mouth of pipe width 40-140mm.
8. as any one described a kind of cooler for recycled exhaust gas of claim 2-7, it is characterized in that heat radiation turbulent flow fin (11), shell body (4), the import water pipe (3) of connecting plate (9), cooling tube (10), ladder type and export between the water pipe (8) being welded by solder technology; Inlet plenum (2) and outlet chamber (6) are by punching press or welding fabrication, and itself and fuse assembly (5) are by being welded into integral body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201173214U CN201503235U (en) | 2009-04-09 | 2009-04-09 | Exhaust gas recirculation cooler and heat dissipation turbulence fin thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201173214U CN201503235U (en) | 2009-04-09 | 2009-04-09 | Exhaust gas recirculation cooler and heat dissipation turbulence fin thereof |
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| Publication Number | Publication Date |
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| CN201503235U true CN201503235U (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201173214U Expired - Lifetime CN201503235U (en) | 2009-04-09 | 2009-04-09 | Exhaust gas recirculation cooler and heat dissipation turbulence fin thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640432A (en) * | 2016-12-25 | 2017-05-10 | 无锡塔尔基热交换器科技有限公司 | Plate-fin type heat exchanger for engine |
| US11486337B2 (en) | 2019-09-06 | 2022-11-01 | Deere & Company | Integrated exhaust system apparatus |
-
2009
- 2009-04-09 CN CN2009201173214U patent/CN201503235U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640432A (en) * | 2016-12-25 | 2017-05-10 | 无锡塔尔基热交换器科技有限公司 | Plate-fin type heat exchanger for engine |
| US11486337B2 (en) | 2019-09-06 | 2022-11-01 | Deere & Company | Integrated exhaust system apparatus |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100609 |