CN103528416B - A kind of high-performance pawl extended surface tube and processing method thereof - Google Patents
A kind of high-performance pawl extended surface tube and processing method thereof Download PDFInfo
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- CN103528416B CN103528416B CN201310483551.3A CN201310483551A CN103528416B CN 103528416 B CN103528416 B CN 103528416B CN 201310483551 A CN201310483551 A CN 201310483551A CN 103528416 B CN103528416 B CN 103528416B
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Abstract
The invention provides a kind of high performance pawl extended surface tube and processing method thereof, at fin circumferentially, the a certain proportion of tooth punching fin of bending according to certain rules, the periphery at the fin after bending and the former place of fin is formed an angle, fin after such bending plays stronger flow-disturbing effect to flue gas, the method not only increases the flow rate between tooth punching fin side and smoke contacts face, makes the flow-disturbing state that flow of flue gas reaches stronger; Remain on the tooth punching fin of origin-location simultaneously, due to the existence of bending fin, also make flue gas more easily reach turbulence state, be so just effectively thinned flue gas boundary layer thickness.On experimental provision, carry out performance test with said method produced high-performance pawl extended surface tube to it, related data shows, the method can improve the convection transfer rate about 30% of flue gas.For the heating surface that flue gas flow rate is relatively low, the improvement of heat-transfer effect is more remarkable.
Description
Technical field
The present invention relates to a kind of high-performance pawl extended surface tube and processing method thereof, belong to industrial exhaust heat utilization, energy-saving and emission-reduction field.
Background technology
Related data shows: the production of units value energy consumption of China is about about 2 times of world average level, and this wherein no doubt has the impact of industrial structure ratio, but deeper reason is that the efficiency of energy utilization of China, using energy source level are lower than advanced international standard; The high accounting present situation of industrial energy consumption is relevant to the factor such as level of industrial technology, technological process on the one hand, the level simultaneously also utilized with industrial exhaust heat and scale close relation.According to statistics, China has the industrial energy consumption close to 50% not to be utilized, but waste heat in a variety of manners directly emits, and the average recovery utilization rate of China's residual heat resources lags behind nearly 20 percentage points of international most advanced level.
Extended surface tube technology has special critical role in UTILIZATION OF VESIDUAL HEAT IN, because the temperature of waste heat medium is usually not high, the temperature difference determined in UTILIZATION OF VESIDUAL HEAT IN process between high/low temperature thermal source is relatively low, be difficult to the prerequisite significantly promoted at the coefficient of heat transfer under, the heat transfer effect realizing expecting only has lifting heat exchange area usually, and such selection can be subject to the restriction of space, place and equipment cost.Extended surface tube technology largely solves above-mentioned contradiction, it increase heat exchange area, promote heat exchange power while, and make to take up room and cost can control in a rational scope, therefore this technology is widely used in field of waste heat utilization.
If in industrial exhaust heat utilizes, by the improvement of new technology to improve the heat exchange property of extended surface tube, so just effectively can reduce the heat exchange area of residual heat using device, thus reach and reduce costs, increase the objects such as utilization rate of waste heat.
Summary of the invention
The technical problem to be solved in the present invention: on the basis of traditional tooth punching fin, a kind of high-performance pawl extended surface tube and processing method thereof are provided, this technology provides a kind of Novel fin tubular construction, it is by the bending degree of changing section tooth punching fin, increases fluid flow-disturbing, improves the coefficient of heat transfer, reduces the objects such as UTILIZATION OF VESIDUAL HEAT IN area to reach.
Technical solution of the present invention is: a kind of processing method of high performance pawl extended surface tube, the processing method of this pawl extended surface tube utilizes pipe, tooth punching band steel and angular wheel to process normal fin and bending fin, bending fin and pawl fin, by special technological process method, pawl fin and normal fin is made to realize being spaced; Described special technological process method is specific as follows: tooth punching band steel is the material for processing fin, the gap of different depth, different spacing is had in the side of tooth punching band steel, form the gear piece of one fixed width and height, to meet different pawl extended surface tube demands, angular wheel is used for realizing pawl function, it with certain tapering to adapt to the process requirements of pawl fin; On angular wheel, the width of each tooth is less than the tooth punching width of fin on tooth punching band steel usually, angular wheel space width must become multiple proportion with the tooth punching width on tooth punching band steel simultaneously, when two tooth centre distances on angular wheel equal two times of space width on tooth punching band steel fin, the processing effect that will form intermittent pawl in the process touched is pressed at angular wheel and tooth punching band steel, and then the tooth punching band steel after processing is uprightly wound on the surface of pipe, and the spacing between two adjacent rings fin is met design requirement; In the process of above-mentioned coiling, the tooth punching band steel root after processing and pipe are welded together by special process, have so just been processed into high-performance pawl extended surface tube.
Wherein, according to the difference of technological process, also can first the tooth punching band steel of non-pawl be welded on pipe according to the requirement of design, make traditional spiral fin coil, and then by previous process, gear piece is carried out to the operation of intermittent pawl with taper gear, no matter which kind of flow process above-mentioned, the final goal manufacturing high-performance pawl extended surface tube finally can be reached.
The present invention provides a kind of high performance pawl extended surface tube in addition, and this pawl extended surface tube utilizes the processing method of above-mentioned a kind of high performance pawl extended surface tube to process.
The present invention's advantage is compared with prior art:
(1), the present invention makes traditional tooth punching fin form the effect of intermittent pawl by special process method, strengthens the flow-disturbing between fin and flue gas, thinning flow boundary layer, thus reaches the target strengthening heat-transfer effect.Relevant theoretical modeling and result of the test show, the method can improve the heat transfer coefficient about 30% of tooth punching extended surface tube; Therefore high-performance pawl extended surface tube is adopted can to save the heat exchange area of residual heat using device in a large number;
(2), based on foregoing invention thought, design special high-performance pawl extended surface tube processing technology: this technique is based on existing extended surface tube processing technology, with special angular wheel for instrument, formed the effect of batch-type pawl by methods such as Row control; This technological process has the remarkable advantages such as processing technology is changed less, working (machining) efficiency is high, can meet the requirement of the scale of high-performance pawl extended surface tube, industrial applications.
Accompanying drawing explanation
Fig. 1 is traditional tooth punching extended surface tube;
Fig. 2 is a kind of high-performance pawl extended surface tube;
Fig. 3 is pawl fin machining sketch chart.
Detailed description of the invention
The present invention is further illustrated below in conjunction with accompanying drawing and specific embodiment.
In field of waste heat utilization, for traditional annular tooth punching fin or spiral tooth punching fin, along the tube wall fin of a week substantially in same plane (although helix fin is along the change to some extent on pipe range direction, the amplitude of change is very little); Due to the existence of flow boundary layer, make the waste heat media such as flue gas insufficient to washing away of fin, thus have influence on the heat transfer effect of whole system.The present invention, by process innovation, makes the part tooth punching of fin regularly bending occur perpendicular on the flow direction of flue gas, can increase the disturbance of flue gas like this, thinning boundary layer, reaches the object increasing the coefficient of heat transfer.
Principle of the present invention is: for the heat transfer process of tooth punching extended surface tube in flue gas, be described in detail as follows to the operation principle of high-performance pawl extended surface tube: in order to reach best heat transfer effect, tooth punching extended surface tube is usually placed on the vertical plane of flue gas stream, because tooth punching fin is circumference along pipe and perpendicular to tube welding, this just makes the periphery at same circle fin place almost be parallel to flow of flue gas direction.When flue gas flows through tube bank, can form boundary layer in the surperficial both sides of tooth punching fin, in inside boundary, flow of flue gas is regular laminar flow, and the transmission of heat mainly realizes by the heat conduction of flue gas, will reduce the heat transfer property of tooth punching fin like this.According to the difference of the factor such as flue gas flow rate, component, flow of flue gas mainly can be divided into laminar flow and turbulent flow two states, for turbulent flow, boundary layer is relatively thin, flue gas is relatively better to the heat transfer effect of fin, and for laminar region, because boundary layer is thicker, there is higher thermal resistance in the heat exchange of flue gas to fin.As can be seen from there being above-mentioned analysis: for traditional tooth punching fin, because fin is along the circumferential direction almost parallel with flow of flue gas direction, therefore there is thicker boundary layer on fin surface, the heat transfer property of fin can be reduced thus.
In order to change the above-mentioned heat-transfer character of fin, the invention provides a kind of high performance pawl extended surface tube: also namely at fin circumferentially, the a certain proportion of tooth punching fin of bending according to certain rules, makes the periphery at the fin after bending and the former place of fin form an angle.Fin after such bending plays stronger flow-disturbing effect to flue gas, and the method not only increases the flow rate between tooth punching fin side and smoke contacts face, makes the flow-disturbing state that flow of flue gas reaches stronger; Remain on the tooth punching fin of origin-location simultaneously, due to the existence of bending fin, also make flue gas more easily reach turbulence state, be so just effectively thinned the boundary layer thickness of flue gas.On experimental provision, carry out performance test with said method produced high-performance pawl extended surface tube to it, related data shows, the method can improve the convection transfer rate about 30% of flue gas.For the heating surface that flue gas flow rate is relatively low, the improvement of heat-transfer effect is more remarkable.
According to fin height, fin pitch, the isoparametric difference of tooth punching width, can there be different selections at the bending angle of pawl fin; Curved spaces of teeth (every tooth bending tooth, every multiple tooth bending tooth or every the multiple teeth of multiple tooth bending etc.) different equally can have influence on the final heat transfer characteristic of pawl extended surface tube too.When this technology is applied to engineering practice, needs the requirement according to heat exchange and flow behavior, on the basis of test, carry out selection and the design of above-mentioned parameter.
As shown in Figure 1, Figure 2, Figure 3 shows, the present invention includes pipe 1, normal fin 2, bending fin 3, tooth punching band steel 4, angular wheel 5 etc.Fig. 1 is normal tooth punching extended surface tube, and Fig. 2 is a kind of high-performance pawl of the present invention extended surface tube, in this example by special process, makes pawl fin and normal fin realize being spaced.
Based on above-mentioned pawl extended surface tube, as follows (see figure 3) is described to its work flow.Band steel 4 in Fig. 3 processes the material of fin for being used for, and has the gap of different depth, different spacing in the side of band steel 4, forms the gear piece of one fixed width and height, to meet different extended surface tube demands.Gear 5 is used to a kind of special tool(s) realizing pawl function, it with certain tapering to adapt to the process requirements of pawl fin.On taper gear 5, the width of each tooth is less than the tooth punching width of fin on band steel usually, and space width must become multiple proportion with the tooth punching width on band steel 4 simultaneously.When two tooth centre distances on taper gear 5 equal two times of space width on band steel fin, press the processing effect that will form intermittent pawl in the process touched at gear 5 and tooth punching band steel 4.And then the band steel 4 after processing is uprightly wound on the surface of pipe 1, and the spacing between two adjacent rings fin is met design requirement; In the process of above-mentioned coiling, tooth punching band steel 4 root after processing and pipe 1 are welded together by special process, have so just been processed into high-performance pawl extended surface tube.
According to the difference of technological process, also can first the tooth punching band steel 4 of non-pawl be welded on pipe according to the requirement of design, make traditional spiral fin coil, and then by previous process, gear piece is carried out to the operation of intermittent pawl with taper gear 5.No matter which kind of flow process above-mentioned, the final goal manufacturing high-performance pawl extended surface tube finally can be reached.
High-performance pawl extended surface tube is when for waste heat recovery apparatus, and curved toothed portion not only adds the contact flow velocity with flue gas medium, also defines stronger flow-disturbing to flue gas.Thus reach reduction fin and the object such as tube surface flue gas boundary layer thickness, enhancing heat-transfer effect.
Relevant experimental result shows, identical structure, high-performance pawl extended surface tube of the same area are than traditional tooth punching extended surface tube, and heat transfer coefficient improves close to 30%.When high-performance pawl fin is applied to the engineering design of UTILIZATION OF VESIDUAL HEAT IN, heat transmission equipment material can be saved, reach and reduce costs, increase the objects such as heat recovery rate.And this technology can by realizing the repacking of traditional fin manufacturing process fast; In recent years, progressively pay attention to the social overall background of waste heat recovery, energy-saving and emission-reduction in China under, this technology application prospect is very bright.
The extended surface tube structure similar with said structure, the interval change of such as bending angle difference, the alteration of form of bending, curved tooth, the bending etc. with certain twist, all belong to the protection category of patent of the present invention, all think the infringement to this patent.
Claims (2)
1. the processing method of a high performance pawl extended surface tube, it is characterized in that, the processing method of this pawl extended surface tube utilizes pipe (1), tooth punching band steel (4) and angular wheel (5) process normal fin (2) and bending fin (3), bending fin (3) i.e. pawl fin, by special technological process method, pawl fin and normal fin is made to realize being spaced, described special technological process method is specific as follows: tooth punching band steel (4) processes the material of fin for being used for, different depth is had in the side of tooth punching band steel (4), the gap of different spacing, form the gear piece of one fixed width and height, to meet different pawl extended surface tube demands, angular wheel (5) is used for realizing pawl function, it with certain tapering to adapt to the process requirements of pawl fin, the width of the upper each tooth of angular wheel (5) is less than the tooth punching width of the upper fin of tooth punching band steel (4) usually, angular wheel (5) space width must become multiple proportion with the tooth punching width on tooth punching band steel (4) simultaneously, when two tooth centre distances on angular wheel (5) equal two times of space width on tooth punching band steel (4) fin, the processing effect that will form intermittent pawl in the process touched is pressed at angular wheel (5) and tooth punching band steel (4), and then the tooth punching band steel (4) after processing is uprightly wound on the surface of pipe (1), and the spacing between two adjacent rings fin is met design requirement, in the process of above-mentioned coiling, tooth punching band steel (4) root after processing and pipe (1) weld together, and have so just been processed into high-performance pawl extended surface tube.
2. the processing method of a kind of high performance pawl extended surface tube according to claim 1, it is characterized in that, according to the difference of technological process, also can first the tooth punching band steel (4) of non-pawl be welded on pipe according to the requirement of design, make traditional spiral fin coil, and then by previous process, gear piece is carried out to the operation of intermittent pawl with taper gear (5), no matter which kind of flow process above-mentioned, the final goal manufacturing high-performance pawl extended surface tube finally can be reached.
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| CN201310483551.3A CN103528416B (en) | 2013-10-15 | 2013-10-15 | A kind of high-performance pawl extended surface tube and processing method thereof |
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| CN201310483551.3A CN103528416B (en) | 2013-10-15 | 2013-10-15 | A kind of high-performance pawl extended surface tube and processing method thereof |
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| CN103528416B true CN103528416B (en) | 2015-07-29 |
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| CN107866677B (en) * | 2017-12-06 | 2023-11-28 | 江阴戴勒姆动力设备有限公司 | Energy-saving spiral fin tooth-forming device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085272A (en) * | 1991-02-11 | 1992-02-04 | The Venables Machine And Tool Company | Spine fin heat exchanger and method and apparatus for producing same |
| CN1112372A (en) * | 1993-07-21 | 1995-11-22 | 巴伯库克日立株式会社 | Heat exchanger using finned tubes |
| CN101881571A (en) * | 2009-05-06 | 2010-11-10 | 通用电气公司 | Fin-tube heat exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56163023A (en) * | 1980-05-20 | 1981-12-15 | Nishiyodo Kuuchiyouki Kk | Manufacture apparatus for finned heating tube |
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2013
- 2013-10-15 CN CN201310483551.3A patent/CN103528416B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085272A (en) * | 1991-02-11 | 1992-02-04 | The Venables Machine And Tool Company | Spine fin heat exchanger and method and apparatus for producing same |
| CN1112372A (en) * | 1993-07-21 | 1995-11-22 | 巴伯库克日立株式会社 | Heat exchanger using finned tubes |
| CN101881571A (en) * | 2009-05-06 | 2010-11-10 | 通用电气公司 | Fin-tube heat exchanger |
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Address after: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Patentee after: Xizi clean energy equipment manufacturing Co.,Ltd. Address before: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Patentee before: HANGZHOU BOILER GROUP Co.,Ltd. |
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