CN103808011A - Cast aluminum heat exchange sheet for fuel gas hot water device - Google Patents

Cast aluminum heat exchange sheet for fuel gas hot water device Download PDF

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Publication number
CN103808011A
CN103808011A CN201410060955.6A CN201410060955A CN103808011A CN 103808011 A CN103808011 A CN 103808011A CN 201410060955 A CN201410060955 A CN 201410060955A CN 103808011 A CN103808011 A CN 103808011A
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flow
water channel
water
heat exchange
gas
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CN201410060955.6A
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CN103808011B (en
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叶远璋
乔中利
武世涛
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Guangdong Vanward New Electric Co Ltd
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Guangdong Vanward New Electric Co Ltd
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Abstract

The invention relates to a cast aluminum heat exchange sheet for a fuel gas hot water device. The cast aluminum heat exchange sheet comprises a sheet body (1), a water way (2) is arranged inside the sheet body (1), and a heat exchange column (3) is arranged on the surface of the sheet body (1). The cast aluminum heat exchange sheet is characterized in that turbulent flow lines (21) are arranged on the wall of the water way (2). According to the cast aluminum heat exchange sheet, the turbulent flow lines are arranged on the wall of the water way, water flow disturbance is carried out from the wall to the center of water flow, the space rotational flow and turbulent state is formed by water flow bodies in the water way, the thickness of retention layers in the water way can be effectively reduced, the convection heat-exchange heat resistance in the water way can be reduced, the wall of the water way can be flushed, sedimentation of sundries in the water way can be avoided, and the heat exchange efficiency can be accordingly improved.

Description

For the cast aluminium heat exchanger fin of gas-fired water heater
Technical field
The present invention relates to a kind of cast aluminium heat exchanger fin for gas-fired water heater, be particularly useful for the equipment such as boiler, gas fired-boiler or gas-heating water heater.
Background technology
According to theory analysis and experimental study, when fluid is turbulence state, fluid is divided into turbulent flow main body, cushion and retention layer, and cushion and retention layer are referred to as boundary layer.Simultaneously, affect fluid convective heat-transfer coefficient α because have the physical quantity such as characteristic dimension l, density p, viscosity, mu, specific heat cp, thermal conductivity factor λ and the flow velocity u of fluid of heat-transfer equipment, they can be expressed by generic function relational expression: α=f (l, ρ, μ, cp, λ, u).Wherein thermal conductivity factor λ depends on the thermal resistance of convection heat transfer' heat-transfer by convection, and convection heat transfer' heat-transfer by convection thermal resistance is mainly made up of the thermal conduction resistance in boundary layer, and boundary layer thickness is larger, and convection heat transfer' heat-transfer by convection thermal resistance is larger.
In prior art, cast aluminium heat exchanger fin is technical at enhancing heat convection, what adopt is in the water channel of heat exchanger fin, to increase turbulence columns to improve the flow regime of current in water channel, this mode is stronger to the mobile main body interference of current, the main body that is conducive to make flow forms turbulent condition, thereby reduce cushion thermal resistance, increase convection heat transfer' heat-transfer by convection efficiency.But because flow-disturbing acts on bodies of fluid position, flow-disturbing action direction is mixed and disorderly, flow disturbance is undertaken by mind-set border in fluid, after cushion effect, lower to retention layer action effect, and retention layer thermal resistance reduces not obvious.For overcoming above-mentioned defect, spy improves the cast aluminium heat exchanger fin for gas-fired water heater.
Summary of the invention
Technical problem to be solved by this invention is that a kind of cast aluminium heat exchanger fin for gas-fired water heater will be provided, and it can improve heat exchange efficiency.
Heat convection can be divided into laminar flow and turbulent flow according to the flow regime of fluid, and both heat-transfer mechanisms have essential difference.In the time that fluid is laminar flow, fluid is along wall laminar flow, and fluid does not mix motion on direction of heat flow, conducts heat and substantially relies on the heat of molecular diffusion effect to conduct to carry out; In the time that fluid is turbulent flow, the heat transfer of turbulent main body is the thermal convection current that eddy current effect causes, is still heat conduction near viscous flow internal layer wall, and therefore, under turbulent condition, the principal element that affects heat convection is wall retention layer thickness.Under equal conditions, the thickness that reduces fluid retention layer can effectively reduce the thermal resistance of convection heat transfer' heat-transfer by convection, increases heat transfer efficiency.In water channel, increase turbulence columns and disturb the flow regime of current, although make current main body produce unstable weak turbulent condition, but flow disturbance is undertaken by middle mind-set wall, close on wall position current perturbation action a little less than, retention layer is thicker, the heat exchange efficiency of heat exchanger promotes limited, should make flow disturbance be carried out to fluid center by the wall of water channel.
Therefore, the present invention solves the technical scheme that its technical problem adopts and is: it comprises lamellar body, and lamellar body inside is provided with water channel, and sheet surface is provided with heat exchange post, and water channel wall is provided with flow-disturbing line.Heat exchange post is for absorbing the heat of high-temperature flue gas, and the flow-disturbing line of water channel wall makes current main body produce disturbance, forms turbulent flow, and flow disturbance carries out towards fluid center by waterway wall, thereby effectively reduces the thickness of fluid retention layer, improves heat transfer effect.
Further, described flow-disturbing line is obliquely installed, more further, the flow-disturbing line on water channel relative wall oppositely arranges, and makes current in water channel, form roughly the mobile space eddy flow turbulent flow of state in the shape of a spiral.
Further, the width D of described water channel upstream region flow-disturbing line is greater than the width D of water channel downstream area flow-disturbing line, and the width of flow-disturbing line is larger, and flow-disturbing effect is stronger.
Further, the angle α of described water channel upstream region flow-disturbing line and water (flow) direction is greater than the angle α of water channel downstream area flow-disturbing line and water (flow) direction.Again further, described angle α is 15 °-45 °, and angle α is larger, and flow-disturbing effect is stronger.
Further, in the water channel of described upstream region, be provided with turbulence columns.Current are under the acting in conjunction of turbulence columns and flow-disturbing line, and current disturbance is carried out by wall and middle of the stream simultaneously, are conducive to further reduce heat convection thermal resistance in water channel, effectively improve heat exchange efficiency.
Further, the sectional area of described water channel reduces gradually from upstream to downstream.Due to water channel interior curve complexity, resistance is larger, and the flow velocity of current is swum over to water channel downstream from water channel and reduced gradually, but by dwindling the sectional area of water channel, can improve the flow velocity of current, thereby the flow-disturbing effect of enhancing flow-disturbing line is strong.
Further, the water inlet of described water channel is arranged on lamellar body bottom, and delivery port is arranged on lamellar body top.
Further, described heat exchange post is distributed in lamellar body both sides, the heat exchange post that two rows the are adjacent setting of staggering.
The present invention compares produced beneficial effect with background technology: because the present invention arranges flow-disturbing line at water channel wall, current disturbance is carried out to middle of the stream by wall, make aqueous fluid in the inner space eddy flow turbulent condition that forms of water channel, therefore it can effectively reduce the thickness of retention layer in water channel, reduce heat convection thermal resistance in water channel, can also wash away runner wall, avoid foreign material to deposit in water channel, thereby improve heat exchange efficiency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the three-dimensional cross-sectional schematic of Fig. 1;
Fig. 3 is the wall structure schematic diagram of left part in Fig. 2;
Fig. 4 is the wall structure schematic diagram of right side part in Fig. 2;
Fig. 5 is the partial enlarged drawing of flow-disturbing line 21 in water channel 2;
Fig. 6 is the schematic diagram one that the present invention is used in combination;
Fig. 7 is the schematic diagram two that the present invention is used in combination.
The specific embodiment
Below in conjunction with accompanying drawing, to adopt the condensation pressure combustion heat exchanger of this cast aluminium heat exchanger fin composition as example, structure and the operation principle of this cast aluminium heat exchanger fin is described in gas fired-boiler.Arrow in Fig. 5 represents water (flow) direction.Dotted arrow in Fig. 6 represents flow of flue gas direction, solid arrow in water channel 2 represents water flow rotary direction, the circle of the band point in water channel 2 represents that water (flow) direction is that vertical paper is outside, the circle of band fork represent water (flow) direction be vertical paper inwards, in water channel 2 circle quantity number represent the size of discharge.Temperature province dividing line in Fig. 6 is the center line in water channel region in lamellar body 1 (region between top water channel roof and bottom water channel diapire).
Referring to Fig. 1 and Fig. 2, cast aluminium heat exchanger fin comprises lamellar body 1, and lamellar body 1 inside is provided with water channel 2, and the water inlet 23 of water channel 2 is arranged on lamellar body 1 bottom, and delivery port 24 is arranged on lamellar body 1 top, and water channel 2 walls are provided with flow-disturbing line 21.Lamellar body 1 surface is provided with heat exchange post 3, and heat exchange post 3 is distributed in lamellar body 1 both sides, the heat exchange post 3 that two rows the are adjacent setting of staggering.When use, lamellar body 1 top (being water channel downstream) approaches the combustion chamber of gas-fired water heater, and flue-gas temperature is higher, is called " high-temperature region ", and lamellar body 1 bottom (being water channel upstream) flue-gas temperature is lower, claims into " low-temperature space ".
Referring to Fig. 2, Fig. 3 and Fig. 4, flow-disturbing line 21 is obliquely installed, and flow-disturbing line 21 on water channel 2 relative walls oppositely arranges.In the water channel 2 of upstream region, be provided with turbulence columns 22.The sectional area of water channel 2 reduces gradually from upstream to downstream.Referring to Fig. 5, the width D of water channel 2 upstream region flow-disturbing lines 21 is greater than the width D of water channel 2 downstream area flow-disturbing lines 21, the angle α of water channel 2 upstream region flow-disturbing lines 21 and water (flow) direction is greater than the angle α of water channel 2 downstream area flow-disturbing lines 21 and water (flow) direction, and angle α is 15 °-45 °.Arrange in the space of runner wall according to flow-disturbing line 21, current are subject to the 21 directionality choked flow effects of wall flow-disturbing line in flow process, make current form tangential flowing at wall.Referring to Fig. 6, the sectional area of water channel reduces gradually from upstream to downstream, and the water channel cross section of lamellar body 1 high-temperature region, top (being water channel downstream) is little, and flow rate of water flow is high, and the 21 flow-disturbing effects of flow-disturbing line are strong, and current are strong to the tangential souring of wall; The water channel cross section of lamellar body 1 bottom low-temperature space (being water channel upstream) is large, and flow rate of water flow is low, a little less than the 21 flow-disturbing effects of flow-disturbing line.The water channel of lamellar body 1 bottom low-temperature space strengthens flow-disturbing effect by increasing the width D of turbulence columns 22 flow-disturbing of overstriking simultaneously lines 21 and strengthening flow-disturbing line 21 with the angle α of water channel, and the disturbance of low-temperature space current is carried out by wall and center simultaneously, strengthens turbulent effect.By above structure, make current in the strong space eddy flow Turbulence Flow of the interior formation of water channel 2, the wall of water impact water channel 2, reduce wall retention layer thickness, take away runner wall deposition foreign material simultaneously, heat exchange efficiency can not only be improved, the safe handling of the combustion gas cast aluminium boiler that uses this condensation pressure combustion heat exchanger can also be improved.In addition, the variation pattern that the sectional area of water channel reduces to downstream gradually from upstream is various: can be successively to successively decrease, i.e. and six layers of water channel from the bottom up as shown in Figure 6, every layer of water channel sectional area is all not identical, ground floor sectional area maximum, layer 6 minimum; Also can be that given layer is not successively decreased, there is the sectional area of some layers of water channel can be identical, six layers of water channel from the bottom up as shown in Figure 7, ground floor sectional area maximum, second and third layer cross section is long-pending identical and be less than ground floor, and fourth, fifth, six layer cross sections are long-pending identical and minimum.
Referring to Fig. 6 and Fig. 7, two lamellar bodies 1 are used in combination, and are V-shape cavity in high-temperature region, top, are conducive to flue gas water conservancy diversion.When gas fired-boiler work, the high-temperature flue gas that combustion gas produces flows from the top down, and high-temperature flue gas is by after the heat exchange post 3 on two lamellar body 1 surfaces, and the heat of flue gas is absorbed by heat exchange post 3, becomes low-temperature flue gas and discharges.Current in water channel 2, under flow-disturbing line 21 and turbulence columns 22 effects, form and stablize strong space eddy flow Turbulence Flow, and the heat expeditiously heat exchange post 3 being absorbed changes away.
This cast aluminium heat exchanger fin utilizes the flow-disturbing line 21 of water channel 2 walls to produce tangential flow-disturbing effect to current, make current in water channel 2 with stable space eddy flow Turbulence Flow, by the tangential flow-disturbing effect of wall, make current that wall is formed strongly tangentially and be washed away, destroy wall retention layer thickness, effectively reduce turbulent convection heat transfer' heat-transfer by convection thermal resistance, improve heat exchange efficiency; In addition, the continuous erosion of utilizing eddy flow to flow to wall, the foreign material that water channel 2 walls are deposited are rushed at fluid center and are taken away by current, play self-cleaning effect, improve running security and the heat transfer effect of gas water-heating furnace.Therefore, under the identical prerequisite of power demand, it is short that the present invention has water channel, and compact conformation uses the advantages such as material is few, can effectively reduce production costs.

Claims (10)

1. for a cast aluminium heat exchanger fin for gas-fired water heater, comprise lamellar body (1), lamellar body (1) inside is provided with water channel (2), and lamellar body (1) surface is provided with heat exchange post (3), it is characterized in that: described water channel (2) wall is provided with flow-disturbing line (21).
2. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 1, is characterized in that: described flow-disturbing line (21) is obliquely installed.
3. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 2, is characterized in that: the flow-disturbing line (21) on described water channel (2) relative wall oppositely arranges.
4. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 1, is characterized in that: the width D of described water channel (2) upstream region flow-disturbing line (21) is greater than the width D of water channel (2) downstream area flow-disturbing line (21).
5. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 1, is characterized in that: the angle α of described water channel (2) upstream region flow-disturbing line (21) and water (flow) direction is greater than the angle α of water channel (2) downstream area flow-disturbing line (21) and water (flow) direction.
6. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 5, is characterized in that: described angle α is 15 °-45 °.
7. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 1, is characterized in that: in the water channel (2) of described upstream region, be provided with turbulence columns (22).
8. the cast aluminium heat exchanger fin for gas-fired water heater according to claim 1, is characterized in that: the sectional area of described water channel (2) reduces gradually from upstream to downstream.
9. according to the cast aluminium heat exchanger fin for gas-fired water heater described in claim 1-8 any one, it is characterized in that: the water inlet (23) of described water channel (2) is arranged on lamellar body (1) bottom, delivery port (24) is arranged on lamellar body (1) top.
10. according to the cast aluminium heat exchanger fin for gas-fired water heater described in claim 1-8 any one, it is characterized in that: described heat exchange post (3) is distributed in lamellar body (1) both sides the heat exchange post (3) that two rows the are adjacent setting of staggering.
CN201410060955.6A 2014-02-24 2014-02-24 Cast aluminum heat exchange sheet for fuel gas hot water device Active CN103808011B (en)

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CN103808011B CN103808011B (en) 2017-02-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104006699A (en) * 2014-06-16 2014-08-27 中南大学 Condensation type heat exchange plate and condensation type heat exchanger with same
CN106352551A (en) * 2016-10-17 2017-01-25 孔明旺 Combined condensing heat exchanger

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432307A (en) * 1981-08-03 1984-02-21 Societe Industrielle Auer Gas- or liquid-fired hot water boiler
CN201621861U (en) * 2010-03-01 2010-11-03 广东万和新电气股份有限公司 Heat exchanger of gas water heater
CN201876172U (en) * 2010-11-10 2011-06-22 北京派捷暖通环境工程技术有限公司 In-tube intensified heating radiator
CN202057221U (en) * 2011-05-16 2011-11-30 浙江前进有色金属铸造有限公司 Heat exchanger with heat collecting nails
CN202403586U (en) * 2012-01-17 2012-08-29 安吉恒盛热能机械有限公司 Turbulence type heat exchange tube
CN202853123U (en) * 2012-09-20 2013-04-03 广东万和新电气股份有限公司 Aluminum casting heat exchanger of gas stove
CN203837269U (en) * 2014-02-24 2014-09-17 广东万和新电气股份有限公司 Cast aluminum heat exchanging piece used for fuel gas hot water unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432307A (en) * 1981-08-03 1984-02-21 Societe Industrielle Auer Gas- or liquid-fired hot water boiler
CN201621861U (en) * 2010-03-01 2010-11-03 广东万和新电气股份有限公司 Heat exchanger of gas water heater
CN201876172U (en) * 2010-11-10 2011-06-22 北京派捷暖通环境工程技术有限公司 In-tube intensified heating radiator
CN202057221U (en) * 2011-05-16 2011-11-30 浙江前进有色金属铸造有限公司 Heat exchanger with heat collecting nails
CN202403586U (en) * 2012-01-17 2012-08-29 安吉恒盛热能机械有限公司 Turbulence type heat exchange tube
CN202853123U (en) * 2012-09-20 2013-04-03 广东万和新电气股份有限公司 Aluminum casting heat exchanger of gas stove
CN203837269U (en) * 2014-02-24 2014-09-17 广东万和新电气股份有限公司 Cast aluminum heat exchanging piece used for fuel gas hot water unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104006699A (en) * 2014-06-16 2014-08-27 中南大学 Condensation type heat exchange plate and condensation type heat exchanger with same
CN106352551A (en) * 2016-10-17 2017-01-25 孔明旺 Combined condensing heat exchanger

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