CN102297618A - Oval heat exchange tube and online tube machining process thereof - Google Patents
Oval heat exchange tube and online tube machining process thereof Download PDFInfo
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- CN102297618A CN102297618A CN2011101526171A CN201110152617A CN102297618A CN 102297618 A CN102297618 A CN 102297618A CN 2011101526171 A CN2011101526171 A CN 2011101526171A CN 201110152617 A CN201110152617 A CN 201110152617A CN 102297618 A CN102297618 A CN 102297618A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an oval heat exchange tube. The tube at least comprises a tube body, wherein a medium channel is encircled by the tube body and the tube body has an oval cross section. The invention also provides an online tube machining process of the oval heat exchange tube. The oval heat exchange tube has low cost, is convenient to machine and is suitable to be used as the efficient heat exchanger or heat exchange equipment in various industries such as petroleum, chemicals, fertilizers, boilers, pharmacy, food, electricity, nuclear energy, environmental protection, heat supply and the like.
Description
Technical field
The present invention relates to the metal tube processing technique field, relate in particular to a kind of oval heat exchanger tube that is used for heat transmission equipments such as heat exchanger.The invention still further relates to the processing technology of aforementioned oval heat exchanger tube.
Background technology
Press GB/T24590-2009 " special tube for high-efficiency heat exchanger " standard, the existing heat exchanger of China is divided into efficient special type pipe and is four major types, is respectively T type barrel, bellows, interior ripple male-pipe, interior barrel.The common ground of their maximums is: all be to go up at metal parent tube (straight collimator) by cold machining process to make the heat exchanger tube that processes.
As shown in Figure 1, T type barrel of the prior art forms intensive helical form T type groove 11 by cold working on the outer wall of metal parent tube 1.T type barrel can be divided into by version: the I type, and the pipe outer wall is T type conduit, inside pipe wall smooth surface; The II type, the pipe outer wall is T type conduit, and the inside pipe wall surface is corrugated.
As shown in Figure 2, bellows of the prior art forms the heat exchanger tube that the inside and outside surface of pipe all is corrugated 11 by cold working on metal parent tube 1.
As shown in Figure 3, of the prior art in the ripple male-pipe, on metal parent tube 1, form the pipe outer wall and be the heat exchanger tube that screw thread 11, inside pipe wall are corrugated 12 by cold working.
As shown in Figure 4, of the prior art in barrel, form the heat exchanger tube of groove 11 by cold working at the inwall of metal parent tube 1.Interior barrel can be divided into by version: I type, axial notch; The II type, helical groove.
Above-mentioned four big class heat exchanger tubes are compared with the metal straight collimator that directly is used as heat exchanger tube without cold working, because on the metal parent tube, have the formed flute profile of cold working, waveform etc., strengthened heat-transfer effect, therefore the heat exchange area and the heat exchange efficiency of heat exchanger tube have been improved effectively, so be called as heat exchanger " efficiently " heat exchanger tube.
Above-mentioned this four big class heat exchanger tube all passes through cold-formed as parent tube with the seamless metal straight collimator, its cold machining process mainly is the variation of the seamless metal straight collimator being done shape.Further, this four big class heat exchanger tube all is to carry out cold working on the inside and outside wall of seamless metal straight collimator, and the processing amplitude is limit by pipe thickness, therefore is difficult to improve significantly heat exchange area again.
Heat exchanger tube of the prior art is when doing heat exchange, and heat transferring mediums such as water, oil, gas circulate in heat exchanger tube, by means of the technical purpose of heat-shift between other media that the heat exchange tube wall is realized and heat exchanger tube is outer.In heat exchanging process, more abundant near the heat exchange that heat transferring medium carried out in heat exchanger tube tube wall zone, heat exchange efficiency is higher; And away from the heat exchanger tube tube wall, be positioned at the heat exchange of heat transferring medium of heat exchanger tube central area and insufficient, though above-mentioned heat exchanger tube therefore of the prior art improves through certain, whole heat exchange efficiency is still lower.
And, some tangible deficiency below heat exchanger tube of the prior art also exists in production, use:
1, be limited by the specification limits of cold working equipment, the heat exchanger tube finished product all is subjected to great limitation at aspects such as specification, length;
2, because the cold working step is arranged, raw-material loss is bigger;
3, because cold working process complexity causes the machining accuracy of product uneven;
4, the method for inspection of cold machining process and measuring means are difficult to guarantee end product quality;
5, limited by processing technology, tubulation efficient is not high;
6, this four big class heat exchanger tube has special external form mostly, and the making of giving heat exchange equipment brings many inconvenience such as the disposal to the deflection plate of bellows, outer barrel;
7, this four big class heat exchanger tube all passes through cold working, has residual stress on the body, medium by the time can form turbulent flow, strengthened the local corrosion of heat exchanger tube, so caused certain negative effect the service life of heat exchanging device equipment.
Heat exchanger tube of the prior art has entered a technical bottleneck for above-mentioned reasons, and heat exchange area, heat exchange efficiency are difficult to increase substantially again, have restricted the development of heat exchanger, are difficult to satisfy the demand in market.
Therefore, those skilled in the art is devoted to develop high heat exchanger tube of a kind of heat exchange efficiency and processing technology thereof always.
Summary of the invention
Because the above-mentioned defective of prior art, technical problem to be solved by this invention provides the high oval heat exchanger tube of a kind of heat exchange efficiency.
For achieving the above object, the invention provides a kind of oval heat exchanger tube, comprise body at least, described body surrounds and forms a medium channel; Described body has oval cross section.
Preferably, described oval cross section is formed by inside and outside two oval surface.
Preferably, described oval cross section is the continuous cold rolling machined surface that described body obtains through press process.
Preferably, the two ends of described body have straight length respectively.
Preferably, described body is the metal welded tube.
Preferably, described medium channel is oval.
Oval heat exchanger tube of the present invention adopts oval-shaped cross section, the middle heat transfer zone that cross-sectional area in the prior art is bigger is dwindled, approaching or identical with the cross-sectional area of peripheral heat transfer zone, improve the heat exchange efficiency of middle heat transfer zone in the medium channel, thereby improved the heat exchange efficiency of whole oval heat exchanger tube.
Therefore oval heat exchanger tube of the present invention is roughly the several times of existing heat exchanger tube on whole heat exchange efficiency, be much higher than existing heat exchanger tube.
It is raw material that the present invention also adopts welded tube first, and the cost of welded tube is lower at least by about 20% than the cost that is used as the raw-material seamless pipe of heat exchanger tube in the prior art, thereby the present invention has reduced the manufacturing cost of heat exchanger tube significantly.
Oval heat exchanger tube of the present invention, have simple in structure, cost is low, makes beneficial effects such as facility, is applicable to the pipe of using that is used as high-performance heat exchanger or heat transmission equipment in the multiple industries such as oil, chemical industry, chemical fertilizer, boiler, pharmacy, food, electric power, nuclear energy, environmental protection, heat supply.
Another object of the present invention is to provide that a kind of technology is simple, easy to process, the processing technology of the above-mentioned oval heat exchanger tube of production of product quality dependable performance.
For achieving the above object, the present invention also provides the online tubulation processing technology of above-mentioned arbitrary oval heat exchanger tube, may further comprise the steps at least: step 1 obtains a metal circular tube; Step 2 is placed into the roller machine with described metal circular tube; Step 3, be subjected to a series of oval pressing mold extruding after, described metal circular tube forms non-circular cross-section, obtains described oval heat exchanger tube.
Preferably, in the described step 1, described metal circular tube is a welded tube.
Preferably, described oval cross section is formed by inside and outside two oval surface.
Preferably, described oval cross section is the continuous cold rolling machined surface that described metal circular tube obtains through press process.
Oval mould among the present invention must be considered factor when design: 1, should not leave the existence of sharp comer in the structural design of oval mould, concentrate the tube wall crackle that causes to prevent the existing in use stress of heat exchanger tube.2, oval tube wall will be complementary with the diameter and the wall thickness of heat exchanger tube.3, ellipse will adapt with DESIGN OF NON ADIABATIC and instructions for use.4, the best heat exchange area of increase heat exchanger tube and heat exchange efficiency are the starting points of oval spiral mould design.
The online pressing process of oval heat exchanger tube of the present invention should be followed following requirement: 1, the target level of product quality of oval heat exchanger tube should strictly be implemented with the welding tube quality standard-required by associated heat exchanger; 2, necessary 100% EDDY CURRENT of the weld seam of oval heat exchanger tube is qualified, and 100% water pressure test is qualified; 3, oval heat exchanger tube should carry out the high tempering typing, is strictly on guard against the shape of product resilience; 4, oval heat exchanger tube should be eliminated heat treatment extruding residual stress by online heat treatment; 5, the online compacting tool set of oval heat exchanger tube should have the unlatching closure function, can leave sufficiently long round light pipe section at the welded tube two ends according to customer demand, in order to the heat exchanger tube manufacturing; 6, the surfaces externally and internally of oval heat exchanger tube abnormity position does not all have sharp comer or corner angle existence.
Processing technology of the present invention is compared with heat exchange tube machining technique in the prior art, owing to there is not a large amount of cold working operations, need not a large amount of cold working operations place, special cold working equipment and professional technique workman, investment cost and manufacturing cost have been saved, thereby reduced the production cost of heat exchanger tube significantly, improve manufacturing efficient, had stable crudy.
Owing to there is not cold working, oval heat exchanger tube of the present invention has significantly reduced raw-material consumption, also owing to do not have a large amount of cold worked residual stress and more smooth interior appearance, oval heat exchanger tube resistance to corrosion of the present invention and resistive connection dirt ability obviously are better than the product that existing technology is produced.
Because a large amount of raw material that use welded tube as oval pipe, the production cost of welded tube itself just reach 20% than seamless pipe is low.Also owing to effective performance of welded tube inherent characteristic, the oval size of its heat exchanger tube can be several times as much as the special type pipe of producing with seamless pipe, and its heat exchange area and heat exchange efficiency are much higher than " the effective special type pipe of high efficient heat exchanging ".
Compare with hot jacket tubulation processing technology, online tube-making process of the present invention has reduced the secondary operations flow process of welded tube, save the outer Equipment for Heating Processing of line of hot jacket processing, because on-line continuous production operation, tool production efficiency is approximately nearly ten times of existing technologies, make the tubulation cost cheaper, tubulation efficient is faster.
And online tubulation also has incomparable advantage aspect the length of finished product.Because online tubulation is processing continuously, in theory, as long as be aided with a follow-up cutting work step, the oval heat exchanger tube of the present invention of acquisition that online tubulation is produced can satisfy client's all lengths requirement.
Because automatic control, constant product quality, the accurate to dimension of online assignment production are higher than existing handicraft product quality level.
Processing technology of the present invention and existing special tube for high-efficiency heat exchanger process technology from the tubulation apparatus cost relatively, existing heat exchanger tube production must have special machined, cold working equipment.And processing technology of the present invention only need be on existing tubulation apparatus be done simple transformation to mould etc., increases the oval pressing molds of many groups, just can online compacting form desired various oval pipes.By online heat treatment mechanism, eliminate the residual stress of oval heat exchanger tube on-line machining, to increase ability to stress corrosion resistant; By online heat treatment mechanism, eliminate the deformation resilience of oval heat exchanger tube simultaneously, obtain dimensionally stable, the oval heat exchanger tube of physical dimension requirement up to specification.
Therefore, processing technology of the present invention has reduced the investment in factory building and place, has reduced investment, the place area occupied need not enlarge, instant effect, beneficial effects such as production efficiency height, its production efficiency are approximately the several times of existing technology, are much higher than the processing technology of existing heat exchanger tube.
Description of drawings
Fig. 1 is the structural representation of a kind of T type barrel in the prior art;
Fig. 2 is the structural representation of a kind of bellows in the prior art;
Fig. 3 is the structural representation of a kind of interior ripple male-pipe in the prior art;
Fig. 4 is the structural representation of a kind of interior barrel in the prior art;
Fig. 5 is the cross-sectional structure schematic diagram of the embodiment 1 of oval heat exchanger tube of the present invention;
Fig. 6 is the compacting flow sheet equipment schematic diagram of online tubulation processing technology middle tube body of the present invention.
The specific embodiment
Be described further below with reference to the technique effect of accompanying drawing, to understand purpose of the present invention, feature and effect fully design of the present invention, concrete structure and generation.
Embodiment 1:
As shown in Figure 5, oval heat exchanger tube 1 of the present invention is one to have the metal welded tube of certain-length, as austenitic stainless steel welded tube, carbon steel welded tube, titanium or titanium alloy welded tube, nickel and nickel alloy welded tube, or austenite-ferrite dual phase steel welded tube etc.
Figure 5 shows that its shape of cross section.The inside and outside surface of body 2 is a smooth surface, is connected to form by two oval surface.
The inside of body 2 forms the medium channel 3 of heat transferring medium circulation.
Body 2 has oval cross section, and medium channel 3 is divided into two side heat transfer zone 31 and a middle heat transfer zone 32.The cross-sectional area of two side heat transfer zone 31 is roughly the same with the cross-sectional area of middle heat transfer zone 32 respectively.
Herein, described " roughly the same " not strict identical.As long as the cross-sectional area of heat transfer zone 32 is not more than 3 times of cross-sectional area of side heat transfer zone 31 in the middle of making, or be not less than 1/3 the getting final product of cross-sectional area of side heat transfer zone 31.
Particularly, the body 2 in the present embodiment is to adopt press process technology to form by the metal welded tube of a circle, and two parallel faces are the continuous cold rolling machined surfaces that body 2 passes through the press process acquisition with two arc transition faces.
The corner of circular arc will have certain radian, and according to the difference of body 2 diameters, preferably adopting knuckle radius is the 2-10 millimeter.Avoided the existence of sharp comer like this.
From shape of cross section, the inner surface of present embodiment middle tube body 2 is to be formed by two oval surface, oval heat exchanger tube 1 like this is when doing heat exchange, the heat exchange efficiency of two end periphery heat transfer zone 31 and a middle heat transfer zone 32 is all than higher, heat transferring medium particularly in the heat transfer zone 32 also participates in the heat transfer process fully, has improved the heat exchange efficiency of oval heat exchanger tube 1 widely.
As the body in the present embodiment 2, its beneficial effect is, not only can improve the heat exchange area of oval heat exchanger tube 1 significantly, has improved the heat exchange efficiency of oval heat exchanger tube 1; Can also strengthen the flow and the flow velocity of heat transferring mediums in the middle heat transfer zone 32, also improve the heat exchange efficiency of oval heat exchanger tube 1.
Oval heat exchanger tube of the present invention is not also owing to have cold working after the tubulation moulding, so internal structure stress eliminates substantially, and anti-fouling tendency, corrosion resistance are better.
According to client's needs, the entire length of oval heat exchanger tube of the present invention can be chosen between ten several meters at 0 meter.Certainly, if the reasonable disposition heat-treatment furnace, the entire length of oval heat exchanger tube of the present invention can also be in random length, and is not subject to the specification of cold working equipment.
Embodiment 2:
The oval heat exchanger tube of present embodiment and the structure of the foregoing description are basic identical, all comprise a body, and institute's difference is in the present embodiment, at the two ends of body, also to have straight length respectively.Straight length is answered rounding off with oval section, can not sharply be out of shape.
Having straight length gets oval heat exchanger tube have better assembling and sealing property in the assembling of heat transmission equipment processing.
Embodiment 3:
The online tubulation processing technology of oval heat exchanger tube 1 of the present invention comprises at least:
In the present embodiment, body 2 is the metal welded tube, and its cross section is formed by two oval surface.In conjunction with shown in Figure 6, body 2 obtains by press process technology.
Press device mainly comprises a series of support 401,402,403, is respectively arranged with top roll 411,412,413 and lower roll 421,422,423 on each support, also is respectively arranged with a series of left roller, right roller (not shown) in the both sides of body 2.All be provided with on each Kun or be formed with a series of progressively the distortion oval pressing molds.
By progressively distortion of four sides extruding, obtain oval-shaped helical tube body 2.
Press in the process of arc shaping at body 2, corner has been avoided the existence of sharp comer.
In other embodiments, can also make two ends end face and its axis normal of oval heat exchanger tube, and remove the otch burr by a spot of cold working.
In other embodiments, the both ends of body can also be reserved as straight length.
The main body of on-line machining equipment is a prior art, just according to the shape needs of oval heat exchanger tube, has designed a series of oval pressing mold according to conventional method.
Therefore above-mentioned processing method of the present invention can be used for processing the oval heat exchanger tube among the arbitrary embodiment of the present invention, all has identical beneficial effect.
In sum, described in this specification is several preferred embodiment of the present invention, and above embodiment is only unrestricted in order to technical scheme of the present invention to be described.All technical staff in the art all should be within claim protection domain of the present invention under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. an oval heat exchanger tube comprises body at least, and described body surrounds and forms a medium channel; It is characterized in that: described body has oval cross section.
2. oval heat exchanger tube as claimed in claim 1 is characterized in that: described oval cross section is formed by inside and outside two oval surface.
3. oval heat exchanger tube as claimed in claim 2 is characterized in that: described oval cross section is the continuous cold rolling machined surface that described body obtains through press process.
4. oval heat exchanger tube as claimed in claim 1 is characterized in that: the two ends of described body have straight length respectively.
5. as the arbitrary described oval heat exchanger tube of claim 1 to 4, it is characterized in that: described body is the metal welded tube.
6. as the arbitrary described oval heat exchanger tube of claim 1 to 4, it is characterized in that: described medium channel is for oval.
7. the online tubulation processing technology of the described oval heat exchanger tube of above-mentioned arbitrary claim, its spy
Levy and be: may further comprise the steps at least:
Step 1 obtains a metal circular tube;
Step 2 is placed into the roller machine with described metal circular tube;
Step 3, be subjected to a series of oval pressing mold extruding after, described metal circular tube forms non-circular cross-section, obtains described oval heat exchanger tube.
8. processing technology as claimed in claim 7 is characterized in that: in the described step 1, described metal circular tube is a welded tube.
9. processing technology as claimed in claim 7 is characterized in that: described oval cross section is formed by inside and outside two oval surface.
10. processing technology as claimed in claim 9 is characterized in that: described oval cross section is the continuous cold rolling machined surface that described metal circular tube obtains through press process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101526171A CN102297618A (en) | 2011-06-08 | 2011-06-08 | Oval heat exchange tube and online tube machining process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101526171A CN102297618A (en) | 2011-06-08 | 2011-06-08 | Oval heat exchange tube and online tube machining process thereof |
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| CN102297618A true CN102297618A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101526171A Pending CN102297618A (en) | 2011-06-08 | 2011-06-08 | Oval heat exchange tube and online tube machining process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116871837A (en) * | 2023-09-04 | 2023-10-13 | 中山莱通金属科技有限公司 | Micro-channel porous flat tube process for low-cost parallel flow radiator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1322064A1 (en) * | 1986-02-28 | 1987-07-07 | Предприятие П/Я Г-4461 | Shell-and-tube heat exchanger |
| CN101492764A (en) * | 2008-01-25 | 2009-07-29 | 上海华钢不锈钢有限公司 | Device for compactly extruding brazing seam of welded tube |
-
2011
- 2011-06-08 CN CN2011101526171A patent/CN102297618A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1322064A1 (en) * | 1986-02-28 | 1987-07-07 | Предприятие П/Я Г-4461 | Shell-and-tube heat exchanger |
| CN101492764A (en) * | 2008-01-25 | 2009-07-29 | 上海华钢不锈钢有限公司 | Device for compactly extruding brazing seam of welded tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116871837A (en) * | 2023-09-04 | 2023-10-13 | 中山莱通金属科技有限公司 | Micro-channel porous flat tube process for low-cost parallel flow radiator |
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Application publication date: 20111228 |